ASSESSMENT OF A MICROALGAE POND FOR POST-TREATMENT OF THE EFFLUENT FROM AN ANAEROBIC FIXED BED REACTOR TREATING DISTILLERY WASTEWATER

摘要

An evaluation of the performance of a laboratory-scale microalgae pond treating effluent from an anaerobic fixed bed reactor digesting distillery wastewater was carried out. The microalgae pond operated with an effluent recycling (R) of 10:1 with respect to the influent and at surface organic loading rates of 418 kg COD ha~(-1) day~(-1) and 92 kg BOD_5 ha~(-1) day~(-1). During the experiment total chemical oxygen demand (COD), biochemical oxygen demand (BOD_5), total solids (TS), total suspended solids (TSS), volatile suspended solids (VSS), total nitrogen, ammonia, total phosphorus, orthophosphate, total chlorophyll (C_T) and chlorophyll a (C_a) concentrations were monitored. Overall COD and BOD_5 removal efficiencies of 98.2 % and 98.8 % were obtained. The global solids removal efficiencies were of 93.2%, 92.6 % and 97.6 % for TS, TSS and VSS, respectively. The removal efficiencies obtained for organic nitrogen and ammonia were 90.2% and 84.1%, respectively. Finally, the removals for total phosphorus and orthophosphate were 85.5% and 87.3%, respectively. It was demonstrated that microalgae grew in this waste by determination of the total chlorophyll and chlorophyll a in the effluent.