Polyphenols removal in winery wastewater using an AnSBR (original) (raw)
Related papers
Water Science & Technology, 2009
The goal of this study was to assess the effect of different modes of operation and configurations of Anaerobic Sequencing Batch Reactors (ASBRs) treating phenolic wastewater. Several lab-scale reactors were used in the mesophilic range. The reactors were fed with synthetic wastewater with aC OD of 5g/L using phenol as ac arbon source (variable concentration) and glucose as a co-substrate. One and two-phase( hydrolytic/acidogenic-methanogenic) systems in batch and fed-batch operation were evaluated. The one-stager eactor operated by the fed batch (which was the only configuration using phenol as as ole carbon source), presented better results for the removal of phenol, reaching 100% removal in 10 days at ac oncentration of 210 mg/L.
Aerobic biodegradation of a mixture of monosubstituted phenols in a sequencing batch reactor
Journal of Hazardous Materials, 2013
A sequencing batch reactor (SBR) was inoculated with p-nitrophenol-degrading activated sludge to biodegrade a mixture of monosubstituted phenols: pnitrophenol (PNP), PNP and o-cresol; and PNP, o-cresol and o-chlorophenol. Settling times were progressively decreased to promote biomass granulation. PNP was completely biodegraded. The PNP and o-cresol mixture was also biodegraded although some transitory accumulation of intermediates occurred (mainly hydroquinone and catechol). o-Chlorophenol was not biodegraded and resulted in inhibition of o-cresol and PNP biodegradation and complete failure of the SBR within a few days. The biomass had very good settling properties when a settling time of 1 min was applied: sludge volume index (SVI 5) below 50 mL g-1 , SVI 5 / SVI 30 ratio of 1 and average particle size of 200 µm.
2015
Background: Phenol, as a pure substance, is used in many fields because of its disinfectant, germicidal, local anesthetic, and peptizing properties. Aqueous solutions of phenol are produced as waste in industries and discharged into the environment. Therefore, elevated concentrations of phenol may be found in air or water because of industrial discharge or the use of phenolic products.Method: The strains of Saccharomyces cerevisiae used in this project were natural strains previously purchased from Razavy company. They were grown at 30°C on Petri plates containing yeast extract glucose (YGC) and then purified by being spread onto new plates, and isolated colonies were obtained. These colonies provided the basis of selection. Prepared strains were applied in anaerobic sequencing batch reactors (ASBRs) as first seed. The experiment conditions were optimized using response surface methodology (RSM). After the determined runs were performed using Design-Expert software, data were analyz...
Water Research, 2005
The physical and biochemical characteristics of the biomass in three lab-scale sequencing batch reactors (SBR) treating a synthetic wastewater at a 20-day target solids retention time (SRT) were investigated. The synthetic wastewater feed contained biogenic compounds and 22 organic priming compounds, chosen to represent a wide variety of chemical structures with different N, P and S functional groups. At a two-day hydraulic retention time (HRT), the oxidation-reduction potential (ORP) cycled between À100 (anoxic) and 100 mV (aerobic) in the anoxic/aerobic SBR, while it remained in a range of 126718 and 249718 mV in the aerobic sequencing batch biofilm reactor (SBBR) and the aerobic SBR reactor, respectively. A granular activated sludge with excellent settleability ðSVI ¼ 98 AE 31 L mg À1 Þ developed only in the anoxic/aerobic SBR, compared to a bulky sludge with poor settling characteristics in the aerobic SBR and SBBR. While all reactors had very good COD removal (490%) and displayed nitrification, substantial nitrogen removal (74%) was only achieved in the anoxic/aerobic SBR. During the entire operational period, benzoate, theophylline and 4-chlorophenol were completely removed in all reactors. In contrast, effluent 3-nitrobenzoate was recorded when its influent concentration was increased to 5 mg L À1 and dropped only to below 1 mg L À1 after 300 days of operation. The competent (active) biomass fractions for these compounds were between 0.04% and 5.52% of the total biomass inferred from substrate-specific microbial enumerations. The measured competent biomass fractions for 4-chlorophenol and 3-nitrobenzoate degradation were significantly lower than the influent COD fractions of these compounds. Correspondent to the highest competent biomass fraction for benzoate degradation among the test SOCs, benzoate oxidation could be quantified with an extant respirometric technique, with the highest specific oxygen uptake rate (SOUR benzoate , 0.026 g O 2 h À1 g À1 XCOD) in the anoxic/aerobic SBR. These combined results suggest that operating SBRs with alternative anoxic/aerobic cycles might facilitate the formation of granular sludge with good settleability, and retain comparable removal of nitrogen and synthetic organic compounds. Hence, the practice of anoxic/aerobic cycling should be considered in wastewater treatment systems whenever possible. r
The treatment of toxic organic compound phenol through sequencing batch reactor (SBR) is known to be effective especially in aerobic conditions. The three major biological treatment processes under aerobic condition are suspended, attached and hybrid growth process. In this study, two different growth systems using laboratory scale aerobic sequencing batch reactors (SBR) were tested to evaluate the biodegradation efficiency of phenol. The objective of this study is to evaluate the performances of two SBR bioreactors with suspended (SG-SBR) and hybrid (HG-SBR) microorganism growth system for removal of phenol containing wastewater. The activated sludge containing microorganisms are maintained in suspension under the suspended system, while granular activated carbon (GAC) was added to promote the formation of biofilm in hybrid system. Both systems were operated with FILL:REACT:SETTLE:DRAW in the time ratio of 1:20:2:1 for a cycle time of 24 h. The average phenol removal were above 80% in the presence of 25 mg/L, 50 mg/L, 75 mg/L and 100 mg/L for both system. The kinetic studies conducted showed that HG-SBR minimized the inhibitory effect of phenol towards the biochemical activities of the microorganisms compared to SG-SBR.
Treatment of winery wastewater in a sequencing batch biofilm reactor
Water science and technology : a journal of the International Association on Water Pollution Research, 2002
Pilot-scale experiments were carried out applying the SBBR process (Sequencing Batch Biofilm Reactor) for the treatment of winery wastewater. The aim was the evaluation of the SBBR performance and the development of a control strategy based on dissolved oxygen (DO) for the optimisation of the SBBR treatment cycle and the minimisation of the energy supply. The results of the experimentation have confirmed the applicability of the SBBR process pointing out high COD removal efficiencies between 86% and 99%, with applied loads up to 29 gCOD m-2d-1, corresponding to 8.8 kgCOD m-3d-1. The on-line monitoring of DO concentration appeared as a good indicator of the progress in the COD biodegradation. The control strategy for the ending of the SBBR cycles was based on the time derivative of the DO concentration. The optimised control strategy makes it possible to obtain a steady quality of the effluent wastewater with an average daily applied load of 6.3 kgCOD m-3d-1 rather than 3.5 kgCOD m-3...
Bioresource Technology, 1993
Wine-d&tillery wastewater has a high organic pollutant load (40 g COD/litre) which includes various phenolic compounds, the major ones being gallic acid, pcoumaric acid and gentisic acid. This feature makes it difficult to treat this wastewater anaerobically without a prior dilution of the wastewater. Partial removal of some of the organic matter and phenolic compounds by aerobic pretreatment with Geotrichum candidum is described in this study. This method provides a partially purified effluent that is more rapidly anaerobically degraded than the original wine-distillery wastewater for the same COD-loading level. The anaerobic bioreactor contained a suspension of micronized clay (saponite) to which the microorganisms responsible for the process adhered. Assuming that the overall anaerobic digestion process follows first-order kinetics, the specific rate constant, K o, was obtained under various conditions. In contrast to the anaerobic digestion of unmodified winedistillery wastewater, the kinetic constants of the anaerobic digestion of aerobically pretreated wine-distillery wastewater were virtually constant over the COD range used (1 "0-6" 7 g/litre).
Biological treatment of winery wastewater: an overview
Water Science and Technology, 2009
The treatment of winery wastewater can realised using several biological processes based both on aerobic or anaerobic systems using suspended biomass or biofilms. Several systems are currently offered by technology providers and current research envisages the availability of new promising technologies for winery wastewater treatment. The present paper intends to present a brief state of the art of the existing status and advances in biological treatment of winery wastewater in the last decade, considering both lab, pilot and full-scale studies. Advantages, drawbacks, applied organic loads, removal efficiency and emerging aspects of the main biological treatments were considered and compared. Nevertheless in most treatments the COD removal efficiency was around 90-95% (remaining COD is due to the un-biodegradable soluble fraction), the applied organic loads are very different depending on the applied technology, varying for an order of magnitude. Applied organic loads are higher in biofilm systems than in suspended biomass while anaerobic biofilm processes have the smaller footprint but in general a higher level of complexity.
Process Safety and Environmental Protection, 2016
Abstract Biodegradability and activity tests of winery wastewater at 37 °C using inoculum from a paper mill suggested hydrolysis as the rate limiting step with hydrogen the predominant pathway to methane. Scaling-up to a Hybrid-EGSB showed that after 100 days acclimation at moderate temperatures (20 ± 2 °C) a 70 ± 2% COD removal is achievable, applying an OLR of up to 15.32 kgCOD m −3 day −1 and an SLR of 3.83 kgCOD kgVSS −1 day −1 , respectively. Conventional operation and mesophilic temperature increase improved COD removal efficiency (≤96%) while sCOD concentration met the European COD effluent standards. COD:CH 4 conversion reached 0.31 ± 0.07 m 3 CH 4 kgCOD removed −1 ; COD:biogas estimated 0.45 ± 0.06 m 3 gas kgCOD removed −1 , ∼300% higher than the acclimation period. Operation remained stable at OLR −3 day −1 , which corresponds to an SLR of 4.8 kgCOD kgVSS −1 day −1 . This limit results in an Alk bicarb .:Alk tot ∼ 0.31 and a pH ∼ 6.51, an irreversible status that demonstrates the limits of anaerobic treatment of winery wastewater with this reactor setup.
Biological treatment of phenolic wastewater in an anaerobic continuous stirred tank reactor
Chemical Industry and Chemical Engineering Quarterly, 2013
In the present study, an anaerobic continuous stirred tank reactor (ACSTR) with a consortium of mixed culture was operated continuously for a period of 110 days. The experiments were performed with three different hydraulic retention times and by varying initial phenol concentrations between 100 and 1000 mg/L. Maximum phenol removal was observed at a hydraulic retention time (HRT) of 4 days, with an organic loading rate (OLR) of 170.86 mg/Ld. At this condition, phenol removal rate of 89% was achieved. In addition, the chemical oxygen demand (COD) removal corresponds to phenol removal. Additional operating parameters such as pH, MLSS and biogas production rate of the effluents were also measured. The present study provides valuable information for the design an anaerobic ACSTR reactor for biodegradation of phenolic wastewater.