An integrated UASB-sludge digester system for raw domestic wastewater treatment in temperate climates

Lew, Beni; Lustig, Irina; Beliavski, Michael; Tarre, Sheldon; Green, Michal

doi:10.1016/j.biortech.2011.01.030

Cited by 47 publications

(27 citation statements)

References 9 publications

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“…This can be attributed to the low temperature range and higher organic loading rate. Low temperature, high loading rate with high per stage of SS all result the shorter SRT and lower down the biogas production and COD removal efficiency [16,17].…”

Section: Biogas Productionmentioning

confidence: 99%

Anaerobic up flow fluidized bed reactor performance as a primary treatment unit in domestic wastewater treatment

2016

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The fluidized bed UASB performance was studied in this experiment as a primary unit the anaerobic unit the advantage of better generated sludge characteristics and smaller tank volume.The reactor performance was investigated for the treatment of domestic wastewater with unexpected industrial water flows at different operational temperatures (14-25°C) and loading rates. For each temperature range the reactor performance was studied under different hydraulic loadings HRT (6, 4, 2.5 h).The best methane yield rate and COD total removal rate are 0.285 l/g COD total and 70.82% respectively at warm working temperature 19°C with OLR 7.76 kg COD/m 3 /day and HRT 6 h.On the low temperature operation, the average COD removal of the reactor was 55.28% and 50.33% for HRT of 4 h and 2.5 h respectively. The methane production dropped to 0.1623 & 0.0988 L CH 4 /g COD with average organic loading rate of 5.34 & 10 kg COD/m 3 /day for HRT of 4 h and 2.5 h respectively.The efficiencies of Total nitrogen removal ranged between 2.23 and 10.83% with an apparent decrease during the low temperature high rate stages. Nitrite removal was in the range of (23.08-77)% with up to the 2 mg/L in the effluent water when obtaining high organic loading and warm temperature. These results demonstrated that the domestic wastewater could be anaerobically treated in a fluidized bed UASB reactor with very low HRT reaching 2.5 h. ª 2015 Production and hosting by Elsevier B.V. on behalf of Housing and Building National Research Center.

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Section: Biogas Productionmentioning

confidence: 99%

Anaerobic up flow fluidized bed reactor performance as a primary treatment unit in domestic wastewater treatment

2016

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“…Therefore, the UASB reactors for domestic wastewater treatment having high level of suspended solids are practicable only at higher temperature which may require an outside heat source [32,40]. Better process understanding and operational knowledge on granules structure have made it possible to apply high organic loads and resulted in reducing startup time and providing a more sustainable operation [40,41]. Its performance in the world proves it to be a consistent and efficient system for wastewater treatment [1].…”

Section: Advantages Of Uasb Technologymentioning

confidence: 99%

“…It is argued that the decrease of temperature slows down the hydrolysis and decreases the maximum growth and substrate utilization rates [5]. Singh et al [72] treated municipal wastewater using a UASB system under low temperature conditions and reported 70% COD removal at 11 ∘ C and 30 to 50% at 6 ∘ C. Lew et al [40] found a gradual decrease in COD removal efficiency as the temperature was decreased. They reported 82% COD removal at 28 ∘ C, 72% at 20 ∘ C, 68% at 14 ∘ C, and 38% at 10 ∘ C. Kalogo and Verstraete [73] also found that COD removal efficiency at temperature in the range of 10-15 ∘ C was lower than that of efficiency at 35 ∘ C. Van Lier and Lettinga [74] studied the effect of transient temperature rise on the performance of a UASB reactor containing mesophilic microorganisms.…”

Section: Effect Of Temperaturementioning

confidence: 99%

Review of Upflow Anaerobic Sludge Blanket Reactor Technology: Effect of Different Parameters and Developments for Domestic Wastewater Treatment

Daud

Rizvi

Akram

et al. 2018

Journal of Chemistry

103

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The upflow anaerobic sludge blanket (UASB) reactor has been recognized as an important wastewater treatment technology among anaerobic treatment methods. The objective of this study was to perform literature review on the treatment of domestic sewage using the UASB reactor as the core component and identifying future areas of research. The merits of anaerobic and aerobic bioreactors are highlighted and other sewage treatment technologies are compared with UASB on the basis of performance, resource recovery potential, and cost. The comparison supports UASB as a suitable option on the basis of performance, green energy generation, minimal space requirement, and low capital, operation, and maintenance costs. The main process parameters such as temperature, hydraulic retention time (HRT), organic loading rate (OLR), pH, granulation, and mixing and their effects on the performance of UASB reactor and hydrogen production are presented for achieving optimal results. Feasible posttreatment steps are also identified for effective discharge and/or reuse of treated water.

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“…Rajagopal et al [29] mentioned that with poor sedimentation characteristics in high loaded anaerobic reactors with suspended solids, the active biomass can be washed out from the reactor with the effluent, causing digester instability. Other drawbacks have been the long start-up period, flotation and disintegration of granular sludge, sludge bulking, deterioration of performance at low temperatures, high sulfate concentration, impure biogas and insufficient removal of organic matters, pathogens and nutrients in the final effluent, thereby failing to comply with the local standards for discharge or reuse [39,52,54,55].…”

Section: Uasb Reactorsmentioning

confidence: 99%

Sustainable Agro-Food Industrial Wastewater Treatment Using High Rate Anaerobic Process

Rajagopal

Saady

Torrijos

et al. 2013

Water

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This review article compiles the various advances made since 2008 in sustainable high-rate anaerobic technologies with emphasis on their performance enhancement when treating agro-food industrial wastewater. The review explores the generation and characteristics of different agro-food industrial wastewaters; the need for and the performance of high rate anaerobic reactors, such as an upflow anaerobic fixed bed reactor, an upflow anaerobic sludge blanket (UASB) reactor, hybrid systems etc.; operational challenges, mass transfer considerations, energy production estimation, toxicity, modeling, technology assessment and recommendations for successful operation.

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An integrated UASB-sludge digester system for raw domestic wastewater treatment in temperate climates

Cited by 47 publications

References 9 publications

Anaerobic up flow fluidized bed reactor performance as a primary treatment unit in domestic wastewater treatment

Anaerobic up flow fluidized bed reactor performance as a primary treatment unit in domestic wastewater treatment

Review of Upflow Anaerobic Sludge Blanket Reactor Technology: Effect of Different Parameters and Developments for Domestic Wastewater Treatment

Sustainable Agro-Food Industrial Wastewater Treatment Using High Rate Anaerobic Process

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