Abstract
Chemical Engineering Department, Gadjah Mada University, has a wastewater treatment plant to process wastewater produced by its laboratories. The WWTP consists of equalization, anaerobic, aerobic and phytoremediation ponds. WWTP operates with the adding of starch as substrate and NPK as nutrient. However this WWTP could not treat wastewater which contained a variety of chemical compounds, so that it did not operate properly. Therefore WWTP revitalization should be done in order to make it operate optimally. The purposes of the research are to determine the effect of Cr on the WWTP stability conditions, and the performance of aerobic activated sludge. The experiment was done by controlling substrates flow as much as 3 litters per day to the aerobic pond in a laboratory scale pond made from plastic with the capacity of 10 litters. The pond was run continuously, the samples of wastewater was taken to measure its BOD, COD, MLSS and MLVSS along with the waste feeding. The results showed that the higher Cr concentration the longer time required by aerobic bacteria to degrade it into Cr. Aerobic bacteria are able to reduce the BOD - COD of waste-water that contains Cr up to 50% on various concentrations.
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