J. Drewnowski | Gdansk University of Technology (original) (raw)

Papers by J. Drewnowski

Research paper thumbnail of Advances in analysis, quantification and modelling of N<sub>2</sub>O emission in SBRs under various DO set points

Journal of physics, Dec 1, 2022

Research paper thumbnail of VІ Міжнародна науково-практична конференція «Чиста вода. Фундаментальні, прикладні та промислові аспекти»

Research paper thumbnail of The process generation of WWTP models for optimization of activated sludge systems

Research paper thumbnail of Modeling External Carbon Addition in Combined N-P Activated Sludge Systems with an Extension of the IWA Activated Sludge Models

Proceedings of the Water Environment Federation, 2011

The aim of this study was to expand the IWA Activated Sludge Model No. 2d (ASM2d) to include the ... more The aim of this study was to expand the IWA Activated Sludge Model No. 2d (ASM2d) to include the effect of adding a readily biodegradable exogenous substrate to anoxic zones of biological N/P removal systems, where it can be used as growth substrate by the Polyphosphate Accumulating Organisms (PAOs) but can not be used by PAOs in the anaerobic zone. The model change was to add a new biodegradable substrate component and process terms for its use by PAOs and other heterotrophic bacteria. The new model and the original ASM2d were first calibrated/validated under dynamic conditions with the results of both batch tests to observe nitrate uptake rates (NURs), phosphorus release rates (PRRs) and anoxic phosphorus uptake rates (PURs) with the settled wastewater and a 96-hour measurement campaign in the full-scale MUCT bioreactor. The results of similar batch tests with ethanol and fusel oil as the external carbon sources were used to adjust the kinetic and stoichiometric coefficients in the expanded ASM2d. The results of these two tests were used to compare predictions of the new model and the original ASM2d. For this purpose, it was assumed that the added external carbon sources were treated as the new component S A,1 (in the expanded ASM2d) or a fraction of S A (in the ASM2d). In the latter case, much higher COD utilization rates were predicted under anoxic conditions, whereas the anoxic PURs in the two-phase experiments were underestimated. In spite of the mechanistically inappropriate approach to treat some external sources as the ASM2d components, the original (calibrated) ASM2d predicted NO 3-N and PO 4-P concentrations in the full-scale bioreactor only slightly different from the new model.

Research paper thumbnail of Internal vs. External (Alternative) Carbon Sources for Denitrification and EBPR Accomplished by a Full-Scale Process Biomass

Proceedings of the Water Environment Federation, 2009

ABSTRACT The efficiencies of denitrification and enhanced biological phosphorus removal (EBPR) in... more ABSTRACT The efficiencies of denitrification and enhanced biological phosphorus removal (EBPR) in biological nutrient removal (BNR) activated sludge systems are strongly dependent on the availability of appropriate carbon sources. The aim of this study was to determine the immediate effects of dosing different carbon sources on the denitrification capability and EBPR interactions of a full-scale process biomass from the “Wschod” WWTP in Gdansk (Poland). The settled wastewater (without pretreatment and after coagulation-flocculation) as well as acetic acid, ethanol and by-products from a distillery were tested in three kinds of batch experiments, such as the “conventional” nitrate utilization rate (NUR) measurements, NUR measurements during anoxic P uptake and aerobic respirometric measurements. The removal of colloidal and particulate fractions by coagulation-flocculation resulted in the reduced process rates: up to 30 and 25%, respectively, for the NUR1 and NUR2 during the “conventional” NUR measurements, and up to 60% for the NUR during the anoxic PUR test. In the “conventional” batch experiments, the observed NURs with fusel oil (2.5–2.7 g N/(kg VSS·h) were higher in comparison with pure ethanol. The addition of fusel oil at the beginning of the anoxic phase (preceded by an anaerobic phase) did not appear to affect adversely the parallel P uptake rates and the observed NURs (3.5–4.3 g N/(kg VSS·h)) were comparable to the other examined carbon sources.

Research paper thumbnail of Transformations of Dissolved and Colloidal Organic Nitrogen in Biological Nutrient Removal Activated Sludge Systems

Proceedings of the Water Environment Federation, 2009

The aim of this study was to investigate transformations of colloidal and dissolved organic nitro... more The aim of this study was to investigate transformations of colloidal and dissolved organic nitrogen (CON and DON) occurring inside biological nutrient removal (BNR) activated sludge bioreactors. For this purpose, both field measurements (influent vs. effluent fractionation, profiles inside bioreactors) and laboratory batch experiments with the process biomass were carried out at various BNR plants in northern Poland. The survey of the influent and effluent fractions of organic nitrogen and carbon, based on filtration of the samples through three membrane filters including 0.1, 0.45 and 1.2 µm pore size filters, were conducted at eight biological nutrient removal (BNR) plants of different size and configurations. Transformations of organic carbon and nitrogen inside bioreactors were investigated in more detail in two largest plants, i.e. Gdansk (565,000 PE) and Gdynia (515,500 PE). The average influent DON (<0.1 μm) concentrations ranged from 1.1 gN/m 3 to 3.9 gN/m 3 and DON accounted for only 4-13% of total organic N (TON). In the effluents, this contribution increased to 12-45%. Ultrafiltration on 0.015 μm pore size filters had a minor effect on further reductions of DON. Inside the two studied bioreactors, the largest reductions of the colloidal fraction were found to occur in the anaerobic and anoxic zones, whereas an increase of DON concentrations was observed under aerobic conditions in the last compartment. Batch experiments with the process biomass confirmed that DON was explicitly produced in the aerobic phase and organic N conversion occurred at a significant rate in the anoxic phase.

Research paper thumbnail of Rapid on-line method of wastewater parameters estimation by electronic nose for control and operating wastewater treatment plants toward Green Deal implementation

DESALINATION AND WATER TREATMENT

In order to comply with legal regulations related to wastewater quality, the operational mode of ... more In order to comply with legal regulations related to wastewater quality, the operational mode of facilities at wastewater treatment plant (WWTP) should be properly adjusted according to parameters of influents, however it is very difficult without frequently performed measurements. Currently there are known many techniques and devices for assesment of wastewater parameters such as chemical oxygen demand, biochemical oxygen demand, total organic carbon, as well as phosphorus and nitrogen compounds. In spite of the far reaching improvements of treatment process automatisation, there still isn't developed a automatic and fast measuring system of wastewater parameters. Rapid on-line method of wastewater parameters estimation by electronic nose and computer simulations could be recomended as an alternative solution in many WWTPs in comparation with traditional approch. Within this paper the analysis of real-time data obtained from laboratory bioreactor were used to estimate wastewater parameters in order to develop the inexpensive and fast-responding measuring for the WWTPs. The elaborated method enables continuous and relatively low cost monitoring of the wastewater quality even in many key points of operating and control WWTP. In this context, computer simulation support with on-line e-nose measurments could be cheap and useful tool to improve the WWTP efficiency.

Research paper thumbnail of Modeling external carbon addition in biological nutrient removal processes with an extension of the international water association activated sludge model

Water environment research, 2012

The aim of this study was to expand the International Water Association Activated Sludge Model No... more The aim of this study was to expand the International Water Association Activated Sludge Model No. 2d (ASM2d) to account for a newly defined readily biodegradable substrate that can be consumed by polyphosphate-accumulating organisms (PAOs) under anoxic and aerobic conditions, but not under anaerobic conditions. The model change was to add a new substrate component and process terms for its use by PAOs and other heterotrophic bacteria under anoxic and aerobic conditions. The Gdansk (Poland) wastewater treatment plant (WWTP), which has a modified University of Cape Town (MUCT) process for nutrient removal, provided field data and mixed liquor for batch tests for model evaluation. The original ASM2d was first calibrated under dynamic conditions with the results of batch tests with settled wastewater and mixed liquor, in which nitrate-uptake rates, phosphorus-release rates, and anoxic phosphorus uptake rates were followed. Model validation was conducted with data from a 96-hour measure...

Research paper thumbnail of Zastosowanie komputerowej symulacji w procesie kształcenia inżyniera branży sanitarnej

Research paper thumbnail of Komputerowe wspomaganie projektowania w procesie kształcenia współczesnego inżyniera branży sanitarnej

Research paper thumbnail of Technologie komputerowego wspomagania projektowania BIM w procesie kształcenia inżyniera branży sanitarnej

Research paper thumbnail of Modelling AOB-NOB competition in shortcut nitrification compared with conventional nitrification-denitrification process

Journal of Physics: Conference Series

In particular, mainstream deammonification and/or shortened nitrification-denitrification via nit... more In particular, mainstream deammonification and/or shortened nitrification-denitrification via nitrite (so-called “nitrite shunt”) is a promising new treatment concept that has the potential to revolutionise how nitrogen removal is achieved at WWTPs. Understanding the role of the AOB/NOB competition in the nitrogen cycle in wastewater treatment systems will change operational strategies of the novel nitrogen removal processes. The key role in this process is inhibition of NOB activity undesirably affects AOB activity and leads to inefficient partial nitrification process and when used as pre-treatment for Anammox it can limit nitrite supply to Anammox bacteria. Successful NOB repression requires a combination of such factors as a low DO concentration, a rapid transition from aerobic to anoxic conditions, and tight control of Temperature and/or pH. The major driving force behind the successful NOB washout is the inhibition of those bacteria based on the difference in the growth rate b...

Research paper thumbnail of Rola koloidalnych i zawiesinowych związków organicznych w technologii oczyszczania ścieków metodą osadu czynnego z biologicznym usuwaniem związków biogennych

Research paper thumbnail of Wewnętrzne i zewnętrzne źródła węgla organicznego dla wspomagania efektywności procesu denitryfikacji

Research paper thumbnail of Wpływ wewnętrznych źródeł węgla organicznego na efektywność usuwania związków biogennych metodą osadu czynnego

106 Po wstąpieniu Polski do Unii Europejskiej znacznie obniżyły się dopuszczalne stężenia związkó... more 106 Po wstąpieniu Polski do Unii Europejskiej znacznie obniżyły się dopuszczalne stężenia związków biogennych w odpływie z oczyszczalni. Zgodnie z danymi Krajowego Programu Oczyszczania Ścieków Komunalnych w Polsce z 2003 r. na 129 dużych oczyszczalni ścieków, aż 109 nie spełniało wymagań dotyczących parametrów ścieków oczyszczonych. Powszechnie stosowane w oczyszczalniach komunalnych wielofazowe układy osadu czynnego umożliwiają efektywny przebieg procesów biologicznego usuwania związków organicznych, azotu i fosforu. Uzyskanie niskich stężeń związków biogennych w ściekach oczyszczonych wymaga zapewnienia optymalnych warunków do przebiegu biochemicznych procesów jednostkowych, takich jak nitryfikacja, denitryfikacja czy podwyższona biologiczna defosfatacja. W celu poprawy efektywności biologicznego usuwania związków biogennych bez konieczności modernizacji bioreaktorów w wytycznych projektowych zaleca się stosowanie dostępnych na rynku tzw. „konwencjonalnych” źródeł węgla zewnętrzn...

Research paper thumbnail of Modeling sequencing batch reactor operational conditions depending on oxygen concentration

IOP Conference Series: Materials Science and Engineering

Sequencing batch reactors (SBR) can be used as a fill-and draw activated sludge system for wastew... more Sequencing batch reactors (SBR) can be used as a fill-and draw activated sludge system for wastewater treatment with considerable operating flexibility and the possibility to conduct experiments under standard conditions and extreme case scenarios. Mathematical modeling and computer simulations provide an opportunity to implement existing wastewater processes in modeling software and evaluate different modifications at low costs and no disturbances for ongoing processes of full scale WWTP. Additionally, the used model can be calibrated and validated against experimental data from laboratory scale devices. The aim of this study was to simulate the processes occurring in laboratory scale SBR under different aeration strategies. The results include the analysis of the adaptation period of the activated sludge biomass in the SBR, as well as the case of breakdown of treatment process due to stoppage of raw wastewater inflow and the interruption of the aeration and/or mixing. As a result, it can be stated that the oxygen transfer rate should be incorporated in the calibration of biological nutrient removal model in order to effectively visualize the individual contributions of each process.

Research paper thumbnail of The application of Monod equation to denitrification kinetics description in the moving bed biofilm reactor (MBBR)

International Journal of Environmental Science and Technology

In this paper, the kinetic constants V max and K COD occurring in the Monod equation, which descr... more In this paper, the kinetic constants V max and K COD occurring in the Monod equation, which describe the denitrification process in the moving bed, are determined. For this purpose, a laboratory moving bed biofilm reactor (MBBR) was used. The filling of the reactor consisted of EvU Perl carriers. The experiment was carried out with an excess of nitrate, and denitrification rate was dependent on the concentration of external organic carbon, which constituted the Brennta Plus preparation. Determination of constants was made by Hofstee-Eadie method, whereby there was obtained: V max = 0.78 g NO 3 −-N/g D.M./ day and K COD = 16.97 g O 2 /m 3. The new Monod equation was verified using MBBR constructed on an industrial scale in wastewater treatment plant in Gronowo Górne (Poland). After joining the MBBR to the technological system and after a period of biomass adaptation, total nitrogen removal efficiency increased from 53.5 to 86.0%. The results of the research have been discussed with several similar researches.

Research paper thumbnail of Bioaugmentation of a sequencing batch reactor with Archaea for the treatment of reject water

Journal of Water Chemistry and Technology

In this study, the bioaugmentation of a sequencing batch reactor (SBR) for the treatment of rejec... more In this study, the bioaugmentation of a sequencing batch reactor (SBR) for the treatment of reject water from wastewater treatment plant was evaluated. For the bioaugmentation step a product containing an enrichment of microorganisms from the Archaea domain was used to enhance the performance of the reactor for treating reject water. The experiment was carried out in two parallel lab-scale sequencing batch reactors. The first one (SBR A) was bioaugmented with a suspension of microorganisms from the Archaea domain, while the second reactor (SBR B) was not bioaugmented. The results here presented show that the SBR technology could sustain efficient NH4+–N and chemical oxyden demand removal rates and can be applied for the treatment of reject water. Moreover, the addition of microorganisms belonging to the Archaea domain improved the SBR overall operation, especially when the loading in the influent was increased. Administering Archaea to the reactor had also a positive effect on ammonia oxidation as well as on the nitrite removal.

Research paper thumbnail of The application of moving bed biofilm reactor to denitrification process after trickling filters

Water Science and Technology, 2016

The paper presents research of a prototype moving bed biofilm reactor (MBBR). The device was used... more The paper presents research of a prototype moving bed biofilm reactor (MBBR). The device was used for the post-denitrification process and was installed at the end of a technological system consisting of a septic tank and two trickling filters. The concentrations of suspended biomass and biomass attached on the EvU Perl moving bed surface were determined. The impact of the external organic carbon concentration on the denitrification rate and efficiency of total nitrogen removal was also examined. The study showed that the greater part of the biomass was in the suspended form and only 6% of the total biomass was attached to the surface of the moving bed. Abrasion forces between carriers of the moving bed caused the fast stripping of attached microorganisms and formation of flocs. Thanks to immobilization of a small amount of biomass, the MBBR was less prone to leaching of the biomass and the occurrence of scum and swelling sludge. It was revealed that the maximum rate of denitrificat...

Research paper thumbnail of The impact of precipitation and external carbon source addition on biological nutrient removal in activated sludge systems – experimental investigation and mathematical modeling

Water Practice & Technology

The aim of this study was to determine the effects of chemical precipitation and addition of exte... more The aim of this study was to determine the effects of chemical precipitation and addition of external carbon sources on the denitrification capability and EBPR interactions at the “Wschod” WWTP (600,000 PE) in Gdansk (northern Poland). For this purpose, different kinds of batch experiments were carried out with the settled wastewater (without pretreatment and after coagulation-flocculation) and external carbon sources (ethanol and fusel oil). Precipitation of colloidal and particulate organic fractions has a significant effect on denitrification and EBPR. The removal of these two fractions by coagulation-flocculation resulted in the reduced process rates (30-70%). The experimental investigations were supported by both lab-scale and full-scale simulations using a newly developed model as an expansion of the Activated Sludge Model No. 2d (ASM2d). The new model accurately predicted the effects of precipitation and external carbon addition in batch experiments. Full-scale simulations re...

Research paper thumbnail of Advances in analysis, quantification and modelling of N<sub>2</sub>O emission in SBRs under various DO set points

Journal of physics, Dec 1, 2022

Research paper thumbnail of VІ Міжнародна науково-практична конференція «Чиста вода. Фундаментальні, прикладні та промислові аспекти»

Research paper thumbnail of The process generation of WWTP models for optimization of activated sludge systems

Research paper thumbnail of Modeling External Carbon Addition in Combined N-P Activated Sludge Systems with an Extension of the IWA Activated Sludge Models

Proceedings of the Water Environment Federation, 2011

The aim of this study was to expand the IWA Activated Sludge Model No. 2d (ASM2d) to include the ... more The aim of this study was to expand the IWA Activated Sludge Model No. 2d (ASM2d) to include the effect of adding a readily biodegradable exogenous substrate to anoxic zones of biological N/P removal systems, where it can be used as growth substrate by the Polyphosphate Accumulating Organisms (PAOs) but can not be used by PAOs in the anaerobic zone. The model change was to add a new biodegradable substrate component and process terms for its use by PAOs and other heterotrophic bacteria. The new model and the original ASM2d were first calibrated/validated under dynamic conditions with the results of both batch tests to observe nitrate uptake rates (NURs), phosphorus release rates (PRRs) and anoxic phosphorus uptake rates (PURs) with the settled wastewater and a 96-hour measurement campaign in the full-scale MUCT bioreactor. The results of similar batch tests with ethanol and fusel oil as the external carbon sources were used to adjust the kinetic and stoichiometric coefficients in the expanded ASM2d. The results of these two tests were used to compare predictions of the new model and the original ASM2d. For this purpose, it was assumed that the added external carbon sources were treated as the new component S A,1 (in the expanded ASM2d) or a fraction of S A (in the ASM2d). In the latter case, much higher COD utilization rates were predicted under anoxic conditions, whereas the anoxic PURs in the two-phase experiments were underestimated. In spite of the mechanistically inappropriate approach to treat some external sources as the ASM2d components, the original (calibrated) ASM2d predicted NO 3-N and PO 4-P concentrations in the full-scale bioreactor only slightly different from the new model.

Research paper thumbnail of Internal vs. External (Alternative) Carbon Sources for Denitrification and EBPR Accomplished by a Full-Scale Process Biomass

Proceedings of the Water Environment Federation, 2009

ABSTRACT The efficiencies of denitrification and enhanced biological phosphorus removal (EBPR) in... more ABSTRACT The efficiencies of denitrification and enhanced biological phosphorus removal (EBPR) in biological nutrient removal (BNR) activated sludge systems are strongly dependent on the availability of appropriate carbon sources. The aim of this study was to determine the immediate effects of dosing different carbon sources on the denitrification capability and EBPR interactions of a full-scale process biomass from the “Wschod” WWTP in Gdansk (Poland). The settled wastewater (without pretreatment and after coagulation-flocculation) as well as acetic acid, ethanol and by-products from a distillery were tested in three kinds of batch experiments, such as the “conventional” nitrate utilization rate (NUR) measurements, NUR measurements during anoxic P uptake and aerobic respirometric measurements. The removal of colloidal and particulate fractions by coagulation-flocculation resulted in the reduced process rates: up to 30 and 25%, respectively, for the NUR1 and NUR2 during the “conventional” NUR measurements, and up to 60% for the NUR during the anoxic PUR test. In the “conventional” batch experiments, the observed NURs with fusel oil (2.5–2.7 g N/(kg VSS·h) were higher in comparison with pure ethanol. The addition of fusel oil at the beginning of the anoxic phase (preceded by an anaerobic phase) did not appear to affect adversely the parallel P uptake rates and the observed NURs (3.5–4.3 g N/(kg VSS·h)) were comparable to the other examined carbon sources.

Research paper thumbnail of Transformations of Dissolved and Colloidal Organic Nitrogen in Biological Nutrient Removal Activated Sludge Systems

Proceedings of the Water Environment Federation, 2009

The aim of this study was to investigate transformations of colloidal and dissolved organic nitro... more The aim of this study was to investigate transformations of colloidal and dissolved organic nitrogen (CON and DON) occurring inside biological nutrient removal (BNR) activated sludge bioreactors. For this purpose, both field measurements (influent vs. effluent fractionation, profiles inside bioreactors) and laboratory batch experiments with the process biomass were carried out at various BNR plants in northern Poland. The survey of the influent and effluent fractions of organic nitrogen and carbon, based on filtration of the samples through three membrane filters including 0.1, 0.45 and 1.2 µm pore size filters, were conducted at eight biological nutrient removal (BNR) plants of different size and configurations. Transformations of organic carbon and nitrogen inside bioreactors were investigated in more detail in two largest plants, i.e. Gdansk (565,000 PE) and Gdynia (515,500 PE). The average influent DON (<0.1 μm) concentrations ranged from 1.1 gN/m 3 to 3.9 gN/m 3 and DON accounted for only 4-13% of total organic N (TON). In the effluents, this contribution increased to 12-45%. Ultrafiltration on 0.015 μm pore size filters had a minor effect on further reductions of DON. Inside the two studied bioreactors, the largest reductions of the colloidal fraction were found to occur in the anaerobic and anoxic zones, whereas an increase of DON concentrations was observed under aerobic conditions in the last compartment. Batch experiments with the process biomass confirmed that DON was explicitly produced in the aerobic phase and organic N conversion occurred at a significant rate in the anoxic phase.

Research paper thumbnail of Rapid on-line method of wastewater parameters estimation by electronic nose for control and operating wastewater treatment plants toward Green Deal implementation

DESALINATION AND WATER TREATMENT

In order to comply with legal regulations related to wastewater quality, the operational mode of ... more In order to comply with legal regulations related to wastewater quality, the operational mode of facilities at wastewater treatment plant (WWTP) should be properly adjusted according to parameters of influents, however it is very difficult without frequently performed measurements. Currently there are known many techniques and devices for assesment of wastewater parameters such as chemical oxygen demand, biochemical oxygen demand, total organic carbon, as well as phosphorus and nitrogen compounds. In spite of the far reaching improvements of treatment process automatisation, there still isn't developed a automatic and fast measuring system of wastewater parameters. Rapid on-line method of wastewater parameters estimation by electronic nose and computer simulations could be recomended as an alternative solution in many WWTPs in comparation with traditional approch. Within this paper the analysis of real-time data obtained from laboratory bioreactor were used to estimate wastewater parameters in order to develop the inexpensive and fast-responding measuring for the WWTPs. The elaborated method enables continuous and relatively low cost monitoring of the wastewater quality even in many key points of operating and control WWTP. In this context, computer simulation support with on-line e-nose measurments could be cheap and useful tool to improve the WWTP efficiency.

Research paper thumbnail of Modeling external carbon addition in biological nutrient removal processes with an extension of the international water association activated sludge model

Water environment research, 2012

The aim of this study was to expand the International Water Association Activated Sludge Model No... more The aim of this study was to expand the International Water Association Activated Sludge Model No. 2d (ASM2d) to account for a newly defined readily biodegradable substrate that can be consumed by polyphosphate-accumulating organisms (PAOs) under anoxic and aerobic conditions, but not under anaerobic conditions. The model change was to add a new substrate component and process terms for its use by PAOs and other heterotrophic bacteria under anoxic and aerobic conditions. The Gdansk (Poland) wastewater treatment plant (WWTP), which has a modified University of Cape Town (MUCT) process for nutrient removal, provided field data and mixed liquor for batch tests for model evaluation. The original ASM2d was first calibrated under dynamic conditions with the results of batch tests with settled wastewater and mixed liquor, in which nitrate-uptake rates, phosphorus-release rates, and anoxic phosphorus uptake rates were followed. Model validation was conducted with data from a 96-hour measure...

Research paper thumbnail of Zastosowanie komputerowej symulacji w procesie kształcenia inżyniera branży sanitarnej

Research paper thumbnail of Komputerowe wspomaganie projektowania w procesie kształcenia współczesnego inżyniera branży sanitarnej

Research paper thumbnail of Technologie komputerowego wspomagania projektowania BIM w procesie kształcenia inżyniera branży sanitarnej

Research paper thumbnail of Modelling AOB-NOB competition in shortcut nitrification compared with conventional nitrification-denitrification process

Journal of Physics: Conference Series

In particular, mainstream deammonification and/or shortened nitrification-denitrification via nit... more In particular, mainstream deammonification and/or shortened nitrification-denitrification via nitrite (so-called “nitrite shunt”) is a promising new treatment concept that has the potential to revolutionise how nitrogen removal is achieved at WWTPs. Understanding the role of the AOB/NOB competition in the nitrogen cycle in wastewater treatment systems will change operational strategies of the novel nitrogen removal processes. The key role in this process is inhibition of NOB activity undesirably affects AOB activity and leads to inefficient partial nitrification process and when used as pre-treatment for Anammox it can limit nitrite supply to Anammox bacteria. Successful NOB repression requires a combination of such factors as a low DO concentration, a rapid transition from aerobic to anoxic conditions, and tight control of Temperature and/or pH. The major driving force behind the successful NOB washout is the inhibition of those bacteria based on the difference in the growth rate b...

Research paper thumbnail of Rola koloidalnych i zawiesinowych związków organicznych w technologii oczyszczania ścieków metodą osadu czynnego z biologicznym usuwaniem związków biogennych

Research paper thumbnail of Wewnętrzne i zewnętrzne źródła węgla organicznego dla wspomagania efektywności procesu denitryfikacji

Research paper thumbnail of Wpływ wewnętrznych źródeł węgla organicznego na efektywność usuwania związków biogennych metodą osadu czynnego

106 Po wstąpieniu Polski do Unii Europejskiej znacznie obniżyły się dopuszczalne stężenia związkó... more 106 Po wstąpieniu Polski do Unii Europejskiej znacznie obniżyły się dopuszczalne stężenia związków biogennych w odpływie z oczyszczalni. Zgodnie z danymi Krajowego Programu Oczyszczania Ścieków Komunalnych w Polsce z 2003 r. na 129 dużych oczyszczalni ścieków, aż 109 nie spełniało wymagań dotyczących parametrów ścieków oczyszczonych. Powszechnie stosowane w oczyszczalniach komunalnych wielofazowe układy osadu czynnego umożliwiają efektywny przebieg procesów biologicznego usuwania związków organicznych, azotu i fosforu. Uzyskanie niskich stężeń związków biogennych w ściekach oczyszczonych wymaga zapewnienia optymalnych warunków do przebiegu biochemicznych procesów jednostkowych, takich jak nitryfikacja, denitryfikacja czy podwyższona biologiczna defosfatacja. W celu poprawy efektywności biologicznego usuwania związków biogennych bez konieczności modernizacji bioreaktorów w wytycznych projektowych zaleca się stosowanie dostępnych na rynku tzw. „konwencjonalnych” źródeł węgla zewnętrzn...

Research paper thumbnail of Modeling sequencing batch reactor operational conditions depending on oxygen concentration

IOP Conference Series: Materials Science and Engineering

Sequencing batch reactors (SBR) can be used as a fill-and draw activated sludge system for wastew... more Sequencing batch reactors (SBR) can be used as a fill-and draw activated sludge system for wastewater treatment with considerable operating flexibility and the possibility to conduct experiments under standard conditions and extreme case scenarios. Mathematical modeling and computer simulations provide an opportunity to implement existing wastewater processes in modeling software and evaluate different modifications at low costs and no disturbances for ongoing processes of full scale WWTP. Additionally, the used model can be calibrated and validated against experimental data from laboratory scale devices. The aim of this study was to simulate the processes occurring in laboratory scale SBR under different aeration strategies. The results include the analysis of the adaptation period of the activated sludge biomass in the SBR, as well as the case of breakdown of treatment process due to stoppage of raw wastewater inflow and the interruption of the aeration and/or mixing. As a result, it can be stated that the oxygen transfer rate should be incorporated in the calibration of biological nutrient removal model in order to effectively visualize the individual contributions of each process.

Research paper thumbnail of The application of Monod equation to denitrification kinetics description in the moving bed biofilm reactor (MBBR)

International Journal of Environmental Science and Technology

In this paper, the kinetic constants V max and K COD occurring in the Monod equation, which descr... more In this paper, the kinetic constants V max and K COD occurring in the Monod equation, which describe the denitrification process in the moving bed, are determined. For this purpose, a laboratory moving bed biofilm reactor (MBBR) was used. The filling of the reactor consisted of EvU Perl carriers. The experiment was carried out with an excess of nitrate, and denitrification rate was dependent on the concentration of external organic carbon, which constituted the Brennta Plus preparation. Determination of constants was made by Hofstee-Eadie method, whereby there was obtained: V max = 0.78 g NO 3 −-N/g D.M./ day and K COD = 16.97 g O 2 /m 3. The new Monod equation was verified using MBBR constructed on an industrial scale in wastewater treatment plant in Gronowo Górne (Poland). After joining the MBBR to the technological system and after a period of biomass adaptation, total nitrogen removal efficiency increased from 53.5 to 86.0%. The results of the research have been discussed with several similar researches.

Research paper thumbnail of Bioaugmentation of a sequencing batch reactor with Archaea for the treatment of reject water

Journal of Water Chemistry and Technology

In this study, the bioaugmentation of a sequencing batch reactor (SBR) for the treatment of rejec... more In this study, the bioaugmentation of a sequencing batch reactor (SBR) for the treatment of reject water from wastewater treatment plant was evaluated. For the bioaugmentation step a product containing an enrichment of microorganisms from the Archaea domain was used to enhance the performance of the reactor for treating reject water. The experiment was carried out in two parallel lab-scale sequencing batch reactors. The first one (SBR A) was bioaugmented with a suspension of microorganisms from the Archaea domain, while the second reactor (SBR B) was not bioaugmented. The results here presented show that the SBR technology could sustain efficient NH4+–N and chemical oxyden demand removal rates and can be applied for the treatment of reject water. Moreover, the addition of microorganisms belonging to the Archaea domain improved the SBR overall operation, especially when the loading in the influent was increased. Administering Archaea to the reactor had also a positive effect on ammonia oxidation as well as on the nitrite removal.

Research paper thumbnail of The application of moving bed biofilm reactor to denitrification process after trickling filters

Water Science and Technology, 2016

The paper presents research of a prototype moving bed biofilm reactor (MBBR). The device was used... more The paper presents research of a prototype moving bed biofilm reactor (MBBR). The device was used for the post-denitrification process and was installed at the end of a technological system consisting of a septic tank and two trickling filters. The concentrations of suspended biomass and biomass attached on the EvU Perl moving bed surface were determined. The impact of the external organic carbon concentration on the denitrification rate and efficiency of total nitrogen removal was also examined. The study showed that the greater part of the biomass was in the suspended form and only 6% of the total biomass was attached to the surface of the moving bed. Abrasion forces between carriers of the moving bed caused the fast stripping of attached microorganisms and formation of flocs. Thanks to immobilization of a small amount of biomass, the MBBR was less prone to leaching of the biomass and the occurrence of scum and swelling sludge. It was revealed that the maximum rate of denitrificat...

Research paper thumbnail of The impact of precipitation and external carbon source addition on biological nutrient removal in activated sludge systems – experimental investigation and mathematical modeling

Water Practice & Technology

The aim of this study was to determine the effects of chemical precipitation and addition of exte... more The aim of this study was to determine the effects of chemical precipitation and addition of external carbon sources on the denitrification capability and EBPR interactions at the “Wschod” WWTP (600,000 PE) in Gdansk (northern Poland). For this purpose, different kinds of batch experiments were carried out with the settled wastewater (without pretreatment and after coagulation-flocculation) and external carbon sources (ethanol and fusel oil). Precipitation of colloidal and particulate organic fractions has a significant effect on denitrification and EBPR. The removal of these two fractions by coagulation-flocculation resulted in the reduced process rates (30-70%). The experimental investigations were supported by both lab-scale and full-scale simulations using a newly developed model as an expansion of the Activated Sludge Model No. 2d (ASM2d). The new model accurately predicted the effects of precipitation and external carbon addition in batch experiments. Full-scale simulations re...