Removal of organic compounds of real textile dyeing wastewater by pilot scale combination process of anoxic baffled reactor-hybrid membrane bioreactor

A pilot-scale combination process of anoxic baffled reactor -hybrid membrane bioreactor for the real textile dyeing wastewater treatment was investigated. Anoxic baffled reactor as a hydrolysis process pre-treatment was performed well, which achieved 35.6 % COD removal efficiency when hydraulic retention time (HRT) was 16 h. The total COD removal efficiency of the combined process was 83.8 %. GC-MS analysis results demonstrated that the main component of raw influent was alkanes including 13 types. After hydrolysis process, the types of alkanes decreased to 5. In subsequent aerobic treatment phase, alkanes of supernatant of HMBR increased to 19, but total organic compounds category decreased to 24. New intermediate CholestaN-3β-ol production demonstrated that some complicated structures or large molecules substances in raw wastewater could be decomposed. GC-MS quantitative analysis results further showed that some toxic and hazardous substances, such as toluene, styrene, 1,2-dichlorobenzene were still in the final effluent. However toxic compounds e.g. phenols could be removed in the subsequent aerobic process. Therefore, most organic pollutants could be removed using the combined process. There were still some amounts of toxic compounds present in the final effluent.