Effects of Organic Loading Rate and Carrier Volume on COD Removal of Dyeing Wastewater in a PEMT-MBBR

In the last decade Polyethylene Terephthalate (PET) production is growing. The wastewater of the “Catalana de Polimers” factory in Barcelona (Spain) has two main streams of similar flow rate, esterification (COD=30,000 mg/l) and textile (COD=4000 mg/l). In order to assess the anaerobic treatment viability, discontinuous and continuous experiments were carried out. Discontinuous biodegradability tests indicated that anaerobic biodegradability was 90 and 75% for esterification and textile wastewater. The textile stream revealed some tendency to foam formation and inhibitory effects. Nutrients, micronutrients and alkali limitations and dosage were determined. A continuous lab-scale UASB reactor was able to treat a mixture of 50% (v) esterification/textile wastewater with stable behaviour at organic loading rate larger than 12 g COD/l.d (0.3 g COD/g VSS.d) with COD removal efficiency greater than 90%. The start-up period was very short and the recuperation after overloading accidents was quite fast, in spite of the wash-out of solids. From the laboratory information an industrial treatment plant was designed and built, during the start-up period COD removal efficiencies larger than 90% and organic loading rate of 0.6 kg COD/kg VSS.d (5 kg COD/m3.d) have been reached.

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Performance of AnMBR in Treatment of Post-consumer Food Waste: Effect of Hydraulic Retention Time and Organic Loading Rate on Biogas Production and Membrane Fouling

Frontiers in Bioengineering and Biotechnology ◽

10.3389/fbioe.2020.594936 ◽

2021 ◽

Vol 8 ◽

Author(s):

Javkhlan Ariunbaatar ◽

Robert Bair ◽

Onur Ozcan ◽

Harish Ravishankar ◽

Giovanni Esposito ◽

...

Keyword(s):

Removal Efficiency ◽

Food Waste ◽

Membrane Fouling ◽

Loading Rate ◽

Biogas Production ◽

Cod Removal ◽

Organic Loading Rate ◽

Organic Loading ◽

Side Stream ◽

Removal Efficiencies

Anaerobic digestion of food waste (FW) is typically limited to large reactors due to high hydraulic retention times (HRTs). Technologies such as anaerobic membrane reactors (AnMBRs) can perform anaerobic digestion at lower HRTs while maintaining high chemical oxygen demand (COD) removal efficiencies. This study evaluated the effect of HRT and organic loading rate (OLR) on the stability and performance of a side-stream AnMBR in treating diluted fresh food waste (FW). The reactor was fed with synthetic FW at an influent concentration of 8.24 (± 0.12) g COD/L. The OLR was increased by reducing the HRT from 20 to 1 d. The AnMBR obtained an overall removal efficiency of >97 and >98% of the influent COD and total suspended solids (TSS), respectively, throughout the course of operation. The biological process was able to convert 76% of the influent COD into biogas with 70% methane content, while the cake layer formed on the membrane gave an additional COD removal of 7%. Total ammoniacal nitrogen (TAN) and total nitrogen (TN) concentrations were found to be higher in the bioreactor than in the influent, and average overall removal efficiencies of 17.3 (± 5) and 61.5 (± 3)% of TAN and TN, respectively, were observed with respect to the bioreactor concentrations after 2 weeks. Total phosphorus (TP) had an average removal efficiency of 40.39 (± 5)% with respect to the influent. Membrane fouling was observed when the HRT was decreased from 7 to 5 d and was alleviated through backwashing. This study suggests that the side-stream AnMBR can be used to successfully reduce the typical HRT of wet anaerobic food waste (solids content 7%) digesters from 20 days to 1 day, while maintaining a high COD removal efficiency and biogas production.

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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 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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Degradation of Organic Constituents in a Biphasic Anaerobic Digester for Treating Pharmaceutical Wastewater

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.l2792.1081219 ◽

2019 ◽

Vol 8 (12) ◽

pp. 679-682

Keyword(s):

Removal Efficiency ◽

Loading Rate ◽

Cod Removal ◽

Organic Loading Rate ◽

Organic Loading ◽

Pharmaceutical Wastewater ◽

Cod Removal Efficiency ◽

Working Volume ◽

Acidogenic Reactor ◽

Mesophilic Conditions

A laboratory scale of biphasic anaerobic bioreactor was operated in a total working volume of 36.92l with 6.15l of Acidogenic and 30.77l of Methanogenic reactor for treating Pharmaceutical wastewater in a mesophilic conditions. The Organic Loading Rate for this experimental study was varied from 1.448 to 30.80Kg COD/m3 .d for Acidogenic Reactor and 0.364 to 9.435Kg COD/m3 .d for Methanogenic reactor. The maximum COD removal efficiency was attained 87.54% with OLR of 2.750Kg COD/m3 .d in Methanogenic reactor and 27.39% with OLR of 3.578 Kg COD/m3 .d Acidogenic reactors. The overall reactor reached the maximum COD removal efficiency of 83.52% with an influent COD of 2864mg/l of pharmaceutical wastewater

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Performance of an anaerobic baffled reactor (ABR) as a hydrolysis-acidogenesis unit in treating landfill leachate mixed with municipal sewage

Water Science & Technology ◽

10.2166/wst.2000.0253 ◽

2000 ◽

Vol 42 (12) ◽

pp. 115-121 ◽

Cited By ~ 13

Author(s):

B. Wang ◽

Y. Shen

Keyword(s):

Landfill Leachate ◽

Loading Rate ◽

Granular Sludge ◽

Operational Performance ◽

Municipal Sewage ◽

Organic Loading Rate ◽

Stable Operation ◽

Organic Loading ◽

Anaerobic Baffled Reactor ◽

Biological Treatability

A study on the performance of an Anaerobic Baffled Reactor(ABR) as a hydrolysis-acidogenesis unit in treating the mixed wastewater of landfill leachate and municipal sewage in different volumetric ratios was carried out. The results showed that ABR substantially improved the biological treatability of the mixed wastewater by increasing its BOD5/COD ratio to 0.4–0.6 from the initial values of 0.15–0.3. The formation of bar-shaped granular sludge of 0.5–5 mm both in diameter and length with an SVI of 7.5–14.2 ml/g was observed in all compartments of the ABR when the organic loading rate reached 4.71 kgCOD/m3 · d. The effects of the ratios of NH4+-N/COD and COD/TP in mixed wastewater on the operational performance were also studied, from which it was found that a reasonable NH4+-N/COD ratio should be lower than 0.02, and the phosphorus supplement was needed when the volumetric ratio was higher than 4:6 for stable operation of ABR.

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