An organic load influence upon 3-stage RBC reactors performance to treat a synthetic effluent
Abstract
This paper deals with the organic load rate (OLR) influence upon removal efficiency of aerobic rotating biological contactor (RBC), i.e. 3-stage reactors by treatment of an industrial synthetic effluent in order to establish adjustment of closing effluent in compliance with Venezuelan legislation. Upon experiment and based on standard methods we evaluated pH, total alkalinity, dissolved oxygen, biological oxygen demand (BOD), chemical oxygen demand (COD), total suspended solid (TSS), overall Kjeldahl nitrogen (TKN), NH4 +, NO2 - and NO3 - . A variation of OLR applied was obtained by modifying hydraulic retention time (HRT) (24, 12, and 6 h), staying constant the initial COD (synthetic influent of sucrose+ urea.) The greater efficiency of COD removal was got for an overall OLR of 11.68 gCOD/m2 .d (96.25%, HRT=12 h.) Removal efficiencies of overall N-total in HRT 24 and 12 h were 66.92 and 62.95%, respectively. The major C&N removal was got during the first stage of reactors to comply with Venezuelan COD allowable limit (<350 mg/L). A likely occurrence of nitrification process triggered increased inorganic nitrogen concentrations by final effluent.
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