Treatment of fish processing wastewater in a one- or two-step upflow anaerobic sludge blanket (UASB) reactor (original) (raw)
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Treatment of canned fish factory wastewater by upflow anaerobic sludge blanket (UASB) reactors
Abstract Application of UASB method for wastewater treatment of canned fish factory reduces the costs of pretreatments processes such as neutralization, and also reduced the costs of final aeration process. In this study, an UASB reactor which was equipped with a 3-phase separator system has been used. At first, a complex of anaerobic digester sludge and return sludge of activated sludge was added to reactor with ratio of 25 to 15. Then, the wastewater of factory entered into the reactor with inlet Organic Loading Rate (OLR) of 0.5 kg/m3.day which was increased gradually up to 4 kg/m3.day. Then, sampling was done for various tests during 75 days. The results of this study showed that UASB method neutralized and reduced the pH of the inlet wastewater from 10.5 to 7.3; and also reduced the SS of the inlet wastewater from 43 gr/l to 8 gr/l. the COD removal rate of this method was around 87%. Keywords: canned fish wastewater, anaerobic treatment, UASB, COD, OLR.
Desalination, 2011
This study aimed at evaluating the effect of increasing organic loading rates and of enzyme pretreatment on the stability and efficiency of a hybrid upflow anaerobic sludge blanket reactor (UASBh) treating dairy effluent. The UASBh was submitted to the following average organic loading rates (OLR) 0.98 Kg.m −3 .d −1 , 4.58 Kg.m −3 .d −1 , 8.89 Kg.m −3 .d −1 and 15.73 Kg.m −3 .d −1 , and with the higher value, the reactor was fed with effluent with and without an enzymatic pretreatment to hydrolyze fats. The hydraulic detention time was 24 h, and the temperature was 30 ± 2°C. The reactor was equipped with a superior foam bed and showed good efficiency and stability until an OLR of 8.89 Kg.m −3 .d −1 . The foam bed was efficient for solid retention and residual volatile acid concentration consumption. The enzymatic pretreatment did not contribute to the process stability, propitiating loss in both biomass and system efficiency. Specific methanogenic activity tests indicated the presence of inhibition after the sludge had been submitted to the pretreated effluent. It was concluded that continuous exposure to the hydrolysis products or to the enzyme caused a dramatic drop in the efficiency and stability of the process, and the single exposure of the biomass to this condition did not inhibit methane formation.
The treatment of Slaughterhouses wastewater by An Up Flow -Anaerobic Sludge Blanket (UASB) reactor
Slaughterhouse wastewater is heavily polluted. It contains a high concentration of oil and grease, phosphorus, nitrogen, organic matter and suspended solids. The objective of the research is study the ability of slaughterhouses wastewater treatment by a UASB reactor and define the best hydraulic retention time (HRT). This research focuses on the treatment of slaughterhouse wastewater in Up Flow Anaerobic Sludge Blanket (UASB) reactor In these reactors, the polluted wastewater rises slowly which allows it to form a suspended sludge blanket. Granules of sludge gather on the surface and anaerobic bacteria is activated which feeds on the organic matter which exists in the liquid. The research includes a study of the effect of hydraulic retention time (HRT) on the efficiency of treatment in UASB reactors at a constant temperature of about (30±1)°C. The experiments have illustrated that it is possible to achieve excellent removal efficiency for high concentrations of COD (Chemical Oxygen demand) when the temperature of the wastewater is fixed at (30±1) °C. The removal efficiency fit with HRTs values in UASB reactor, for the following values of HRTs:(6,12,18,24,30,36) hours, the removal efficiencies of COD were:(35.78%, 48.93%, 56.15%, 71.3% , 76.33%, 83.37%) respectively.
2008
Processing of palm oil fruit into palm oil produced high strength wastewater which is known as palm oil mill effluent (POME). POME contains high concentrations of chemical oxygen demand (COD), total solids (TS), and suspended solids (SS). Before POME can be discharged to the environment, it has to be treated to the level conforming to the discharge standards. Currently, most palm oil mills in Malaysia are using anaerobic ponds to treat POME. This is very conventional and often creates environmental pollution themselves. Therefore, the aim of this study is to assess a more suitable treatment method to overcome the limitations and disadvantages of anaerobic ponds. In this study, three hybrid up-flow anaerobic sludge blanket (HUASB) reactors, treating POME with COD of ±5000 mg/L at room temperature were operated. Coarse gravel, fine gravel and crushed glass were applied as filter media in three reactors (R1, R2 and R3). The reactors were operated at organic loading rate (OLR) of 1.83 g COD/L.d and hydraulic retention time (HRT) of 2.73d for the start up operation. Experimental results indicated that POME can be treated more effectively by using HUASB reactors because HUASB was able to retain more biomass in the filter media in addition to the high concentration of biomass in the sludge blanket. Efficiency of treatment up to 98 % removal was observed. It was also shown that the HUASB reactors have shortened the start up period from 60 days as in UASB (up-flow anaerobic sludge blanket) reactors (in previous study) to 47 days to achieve steady state.
2013
The upflow anaerobic sludge blanket (UASB) process is known to be energy conservative biotechnology. Its low cost and low skill requirement render it to be a viable technology for reducing organic pollution loads. However, this system is facing a challenge in the treatment of low-strength wastewater especially inoculated with non-granular sludge. This work was performed to emphasis an in-depth understanding of an UASB reactor start-up process inoculated with digested slurry for treating synthetic wastewater of chemical oxygen demand (COD) around 700-1000 mg/L. The lab scale reactor with an effective volume of 9.97 L was operated under ambient temperature (24-35 0 C). At the end of start-up period that lasted for 84 days, this system achieved 90.8% COD removal and a biogas evolution of 4.72 L/d (457 L / kg COD removal) at an organic loading rate (OLR) of 1.293 kg COD/ m 3 d. Concurrently, the volatile fatty acids (VFA)/ alkalinity ratio was found as 0.184. It confirms the stability o...
Biotechnology and Bioengineering, 1980
In recent years considerable effort has been made in the Netherlands toward the development of a more sophisticated anaerobic treatment process, suitable for treating low strength wastes and for applications at liquid detention times of 3-4 hr. The efforts have resulted in a new type of upflow anaerobic sludge blanket (UASB) process, which in recent 6 m3 pilot-plant experiments has shown to be capable of handling organic space loads of 15-40 kg chemical oxygen demand (COD).m-Yday at 3-8 hr liquid detention times. In the first 200 m3 full-scale plant of the UASB concept, organic space loadings of up to 16 kg COD.~n-~/day could be treated satisfactorily at a detention time of 4 hr, using sugar beet waste as a feed. The main results obtained with the process in the laboratory as well as in 6 m3 pilot plant and 200 m3 full-scale experiments are presented and evaluated in this paper. Special attention is given to the main operating characteristics of the UASB reactor concept. Moreover, some preliminary results are presented of laboratory experiments concerning the use of the USB reactor concept for denitrification as well as for the acid formation step in anaerobic treatment. For both purposes the process looks feasible because very satisfactory results with respect to denitrification and acid formation can be achieved at very high hydraulic loads (12 day-') and high organic loading rates, i.e., 20 kg COD.~n-~/day in the denitrification and 60-80 kg C O D~r~/ d a y in the acid formation experiments.
IJERT-Study of An Up-Flow Anaerobic Sludge Blanket Reactor in the Treatment of Slaughter Wastewater
International Journal of Engineering Research and Technology (IJERT), 2021
https://www.ijert.org/study-of-an-up-flow-anaerobic-sludge-blanket-reactor-in-the-treatment-of-slaughter-wastewater https://www.ijert.org/research/study-of-an-up-flow-anaerobic-sludge-blanket-reactor-in-the-treatment-of-slaughter-wastewater-IJERTV10IS010055.pdf The wastewater discharged by the slaughterhouse was characterized mainly by the high biochemical oxygen demand, high suspended solids, and complex mixture of fats, proteins are requiring systematic treatment before disposal. This study was carried out to examine a lab-scale up-flow anaerobic sludge blanket reactor performance to treat slaughter wastewater under varying operating conditions. (pH) 7.1-7.8, total suspended solids (TSS) 900-1500 mg/l, total dissolved solids (TDS) 1600-3000 mg/l, chemical oxygen demand (COD) 3000-5000 mg/l). The reactor was running at varying OLR (0.025) and HRT (7.00, 11.00, 15.00, 19.00, 23.00 hrs.) at a temperature of (29-35°C). The maximum total demand for the chemical oxygen removal efficiency of 82.83% was achieved at an organic loading rate of 0.015 kg/COD/m 2 /day and at the hydraulic retention time of 23 hours.
Aquaculture, 2008
Intensive recirculating aquaculture systems (RAS) produce high volumes of biosolid waste. The high salinity of brackish/marine sludge limits its use in landfill sites and waste outflows and it is a source of pollution. A reduction in sludge mass would therefore minimize the potential environmental hazard and economic burden stemming from its disposal. The aims of the current study were: 1) to characterize brackish aquaculture sludge (BAS) from three RAS in order to test for potentially suitable treatments, and 2) to test the BAS's suitability for anaerobic digestion in an upflow anaerobic sludge blanket reactor (UASB). Brackish sludge from three intensive RAS was collected periodically and analyzed for a variety of physical and chemical parameters. The mean sludge electrical conductivity and pH values ranged from 4.0 to 8.6 mS cm − 1 and 7.0 to 7.7, respectively. A low sludge redox potential averaging −80 mV and dissolved oxygen concentrations of less than 1 mg l − 1 indicated the existence of anaerobic conditions. Volatile solids comprised 56 to 76% of the dry weight and the sludge volume index ranged from 44 to 69 ml g − 1 . High concentrations of total nitrogen and total carbon were also observed, resulting in a C:N ratio ranging between 8.1 and 10.3. Toxic and/or inhibitory compounds for methanogenesis such as nitrites, nitrates and sulfides were almost absent. Sludge BOD 5 ranged from 10 to 30% dry weight. These data suggest that BAS may be used in anaerobic digestion and methanogenesis without pretreatment. This concept was tested by digesting aquaculture sludge in UASB reactors. Despite the high sulfate and phosphate concentrations in the BAS, these were found not to be inhibitory to methanogenesis. Up to 70% sludge-mass reduction and an average of 40% methane production were demonstrated.