The Effect of Organic Loading Rate Variation on Digestion of Tofu Wastewater using PVC Rings as Growth Media in a Hybrid UASB Reactor

The aim of this work was to evaluate the performance of a pilot-scale upflow anaerobic sludge blanket (UASB) reactor during the treatment of cereal-processing industry wastewater under low-temperature conditions (17 °C) for more than 300 days. The applied organic loading rate (OLRappl) was gradually increased from 4 to 6 and 8 kg CODsol/m3d by increasing the influent soluble chemical oxygen demand (CODsol), while keeping the hydraulic retention time constant (5.2 h). The removal efficiency was high (82 to 92%) and slightly decreased after increasing the influent CODsol and the OLRappl. The highest removed organic loading rate (OLRrem) was reached when the UASB reactor was operated at 8 kg CODsol/m3d and it was two times higher than that obtained for an OLRappl of 4 kg CODsol/m3d. Some disturbances were observed during the experimentation. The formation of biogas pockets in the sludge bed significantly complicated the biogas production quantification, but did not affect the reactor performance. The volatile fatty acids in the effluent were low, but increased as the OLRappl increased, which caused an increment of the effluent CODsol. Anaerobic treatment at low temperature was a good option for the biological pre-treatment of cereal processing industry wastewater.

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The Potential of Phosphorus Removal in UASB Reactor

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.130-134.3515 ◽

2011 ◽

Vol 130-134 ◽

pp. 3515-3517

Author(s):

Ping Lu ◽

Tao Ding ◽

Jin Ye Li ◽

Jin Xia Mu

Keyword(s):

Phosphorus Removal ◽

Loading Rate ◽

Removal Rate ◽

Uasb Reactor ◽

Organic Loading Rate ◽

Organic Loading ◽

Effluent Concentration ◽

Biological Phosphorus ◽

Main Factor

The potential of phosphorus removal rate was investigated using a lab scale UASB reactor The volumetric phosphorus removal rate was up to 20 mgP/L•d, and the phosphorus effluent concentration was below 0.5 mgP/L under high organic loading rate. Biological phosphorus assimilation could be the main pathways of phosphorus removal in UASB reactor, and the organic loading rate could be the main factor affecting phosphorus removal.

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The efficacy of ozone as a pre- and post-treatment option for UASB-treated food processing wastewaters

Water Science & Technology ◽

10.2166/wst.2005.0513 ◽

2005 ◽

Vol 52 (1-2) ◽

pp. 167-173 ◽

Cited By ~ 5

Author(s):

G.O. Sigge ◽

T.J. Britz ◽

P.C. Fourie ◽

C.A. Barnardt

Keyword(s):

Treatment Option ◽

Food Processing ◽

Loading Rate ◽

Post Treatment ◽

Cod Removal ◽

Uasb Reactor ◽

Organic Loading Rate ◽

Organic Loading ◽

Reactor Performance ◽

Cod Reduction

The efficiency of ozone as a pre- and post-treatment to UASB treatment was investigated, followed by a study into UASB reactor performance with ozonated wastewater as substrate. Combinations of pre- and/or post-ozonation with UASB treatment gave better results than ozonation or UASB alone and COD reductions of 53.0–98.9% were achieved for treatment of canning and winery wastewaters. A UASB reactor was fed with pre-ozonated cannery wastewater for over 70 d. COD removal improved from between 58.8 and 64.4% to between 85.3 and 91.8% after pre-ozonated substrate feed commenced. Subsequent increases in organic loading rate (OLR) from 2.4 to 3.4 kgCOD m−3.d−1 did not affect reactor performance. By including a final post-ozonation treatment to this UASB effluent a total COD reduction of 99.2% was achieved.

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Effect of enzymatic pretreatment and increasing the organic loading rate of lipid-rich wastewater treated in a hybrid UASB reactor

Desalination ◽

10.1016/j.desal.2011.05.067 ◽

2011 ◽

Vol 279 (1-3) ◽

pp. 96-103 ◽

Cited By ~ 22

Author(s):

D.R.S. Gomes ◽

L.G. Papa ◽

G.C.V. Cichello ◽

D. Belançon ◽

E.G. Pozzi ◽

...

Keyword(s):

Loading Rate ◽

Uasb Reactor ◽

Organic Loading Rate ◽

Organic Loading ◽

Enzymatic Pretreatment

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Effect of Organic Loading Rate on Anaerobic Digestion Performance of Mesophilic (UASB) Reactor Using Cattle Slaughterhouse Wastewater as Substrate

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph15102220 ◽

2018 ◽

Vol 15 (10) ◽

pp. 2220 ◽

Cited By ~ 15

Author(s):

Mohammed Musa ◽

Syazwani Idrus ◽

Che Hasfalina ◽

Nik Daud

Keyword(s):

Methane Concentration ◽

Volatile Fatty Acids ◽

Loading Rate ◽

Cod Removal ◽

Upflow Anaerobic Sludge Blanket ◽

Uasb Reactor ◽

Organic Loading Rate ◽

Anaerobic Sludge ◽

Organic Loading ◽

Slaughterhouse Wastewater

In this study, the performance of a laboratory scale upflow anaerobic sludge blanket (UASB) reactor operating at mesophilic temperature (35 °C) was examined. Cattle slaughterhouse wastewater (CSWW) was used as the main substrate. The total and effective volumes of the reactor were 8 L and 6 L, respectively. Twelve different organic loading rates (OLR) were applied and the performance was evaluated. The chemical oxygen demand (COD) removal efficiency was more than 90% during batch study. In the continuous study, COD removal was also approximately 90% at OLR 0.4 g/L d−1 which subsequently dropped to below 50% when the loading rate increased to 15 g/L d−1. Approximately 5 L/d of biogas was obtained with high methane concentration at stages VI and XI corresponding to OLR of 2 and 10 g/L d−1, respectively. It was observed that the concentration of volatile fatty acids was low and that the alkalinity of the wastewater was sufficient to avoid acidification. Specific methane yields of 0.36 and 0.38 LCH4/g COD added were achieved at OLR 7 and 10 g/L d−1. A hydraulic retention time (HRT) of 1 day was sufficient to remove greater than 70% of COD which correspond to 89% methane concentration. Parameters like soluble COD, NH3-N, pH, alkalinity, total suspended solid (TSS), fats, oil, and grease were also investigated. The results show that the UASB reactor could serve as a good alternative for anaerobic treatment of CSWW and methane production.

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UASB performance in presence of algae and synthetic media

Water Science & Technology ◽

10.2166/wst.1997.0439 ◽

1997 ◽

Vol 36 (12) ◽

pp. 125-133 ◽

Cited By ~ 2

Author(s):

Jae Eun Park ◽

Jong O Kim ◽

Woo Bum Lee ◽

Sung Taik Lee ◽

Jung Jun Lee

Keyword(s):

Loading Rate ◽

Gas Production ◽

Upflow Anaerobic Sludge Blanket ◽

Uasb Reactor ◽

Organic Loading Rate ◽

Anaerobic Sludge ◽

Organic Loading ◽

Production Rates ◽

The Media ◽

Synthetic Media

An upflow anaerobic sludge blanket (UASB) technology has showed an excellent performance compared to other biological treatment methods when a high organic loading rate of domestic and industrial wastewaters was applied. The objective of this study was to investigate the effect algae from lake-sediments and synthetic activated ceramic as media on UASB performance. The algae and synthetic media were introduced to the UASB reactor in order to obtain the enhanced granulation, which resulted in the increase in the UASB performance. 1–3% higher methane content and 3–10% higher COD removal efficiency were obtained in the reactors with the media than in the reactor without the media. The respective gas production rates in reactors 1,2, and 3 were 0.15–0.36 m3/kg COD-day, 0.24–0.54 m3/kg COD-day, and 0.24–0.56 m3/kg COD-day. As organic loading rate increased, gas production rates increased.

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