Abstract
An anaerobic plate-column reactor, developed to retain a high concentration of biomass, was studied using starch-containing synthetic wastewaters with regard to its start-up profile and the effects of TOC-loading rate, hydraulic retention time (HRT), and temperature in a steasy state. Each operation was started up at an initial biomass concentration of ca. 0.5 mg-N/ml ( ca. 5 mg-VSS/ml), 20°C, an HRT of 30 h, and a TOC-loading rate of 0.8 g/ l/d. The removal defficiency of dissolved organic carbon exceeded 90% after 29 d. The efficiency reached a steady state at 98% removal after 116 d. The biomass concentration in the reactor was 2.3 mg-N/ml after 154 d. Circulation of effluent at a ratio of 1 gave a lower removal efficiency and a lower biomass concentration than the same reactor without circulation. The effect of TOC-loading rate was studied at an HRT of 30 h, 20°C, and removal efficiencies were found 91% at 1.6 g/ l/d and 77% at 3.2 g/ l/d. The effect of HRT was studied at a TOC-loading rate of 0.8 g/ l/d, 20°C, and removal efficiencies 91% at an HRT of 12 h and 72% at an HRT of 6 h.
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