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The start-up of anaerobic sequencing batch reactors at 20degreeC and 25degreeC for the treatment of slaughterhouse wastewater



The start-up of anaerobic sequencing batch reactors at 20degreeC and 25degreeC for the treatment of slaughterhouse wastewater



Journal of Chemical Technology & Biotechnology 76(4): 393-400, April



The objective of this research was to evaluate the feasibility, the stability and the efficiency of a start-up at 20degreeC and 25degreeC of anaerobic sequencing batch reactors (ASBRs) treating slaughterhouse wastewater. Influent chemical oxygen demand (COD) and suspended solids concentrations averaged 7500 and 1700mg dm-3, respectively. Reactor start-up was completed in 168 and 136 days at 20degreeC, and 25degreeC, respectively. The start-up process was stable at both temperatures, except for a short period at 20degreeC, when effluent volatile fatty acid (VFA) concentrations increased from an average of 40 to 400mg dm-3. Effluent quality varied throughout start-up, but in the last 25 days of the experiment, as the ASBRs were operated under organic loading rates of 2.25+-0.21 and 2.86+-0.24kg m-3 d-1 at 20degreeC and 25degreeC, respectively, total COD was reduced by 90.3%+-1.3%. Methanogenesis was not a limiting factor during start-up. At 20degreeC, the limiting factor was the acidification of the soluble organics and, to a smaller extent, the reduction of propionic, isobutyric and isovaleric acids into lower VFAs. At 25degreeC, the limiting factor was the hydrolysis of particulate organics. To minimize biomass loss during the start-up period, the organic loading rate should be increased only when 75 -80% of the COD fed has been transformed into methane within the design hydraulic retention time.

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Accession: 011551342

Download citation: RISBibTeXText

DOI: 10.1002/jctb.395



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