Abstract
The performance of a dual and multi-stage treatment system which was made up of two-stage whole stillage anaerobic fermentation (WSAF), an internal circulation reactor (IC), an anoxic/aerobic reactor (A/O) and a biological aerated filter (BAF), was investigated for the treatment of complex chemical wastewater with an influent chemical oxygen demand (COD) concentration of 700-55,000 mg/L. According to different wastewater sources and qualities, different types of wastewater were inputted into the treatment system. More than 95% of CODCr and suspended substance (SS) could be removed by anaerobic treatment. Approximately 4% of CODCr and SS could be removed during the phases of A/O and BAF. The highest values of CODCr, BOD5, NH3-N and SS in the treated effluent were 87.0, 19.7, 14.5 and 38.0 mg/L, respectively.
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