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The objective of the present study was to determine the optimum operating temperature of laboratory-scale upflow anaerobic sludge blanket (UASB) reactors during the treatment of a chocolate-processing industry wastewater at medium applied organic loading rates (OLR). Four UASB reactors were operated at different temperature (15, 20, 25 and 30 °C) and three OLR (2, 4 and 6 kg soluble chemical oxygen demand (COD)/(m d)). The flowrate and the hydraulic retention time were constant (11.5 L/d and 6 h, respectively). The monitored parameters were pH, temperature, COD, and total and volatile suspended solids. The COD removal efficiency (RE) and biogas production rate (BPR) were calculated. The 15 °C UASB reactor had the lowest RE (39 to 78%) due to the low operating temperature. Regardless of the OLR, the RE of the 20, 25 and 30 °C reactors was high and similar to each other (between 88 and 94%). The BPR of the four UASB reactors had the same behaviour as the RE (BPR of 15 °
0.3 to 0.5 L/(L d) (L/(L d)) and BPR of 20, 25 and 30 °
0.5 to 1.9 L/(L d)).
This article was published in the following journal.
Name: Water science and technology : a journal of the International Association on Water Pollution Research
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INDUSTRY concerned with the extraction, processing, distribution, marketing and storage of PETROLEUM and NATURAL GAS.
The industry concerned with processing, preparing, preserving, distributing, and serving of foods and beverages.
The industry concerned with the removal of raw materials from the Earth's crust and with their conversion into refined products.
The productive enterprises concerned with food processing.
Organic compounds which contain tin in the molecule. Used widely in industry and agriculture.