Pretreatment of hypersaline mustard wastewater with integrated bioreactor

Abstract

A full-scale experimental study of treating mustard wastewater by the integrated bioreactor with designed scale of 1 000 m³/d is conducted combined with a demonstration project. The systematical researches on the efficiency of combined operation conditions of anaerobic-aerobic and anaerobic-aerobic-flocculation as well as chemical phosphorus removal of hypersaline mustard wastewater are conducted. The optimal operation condition and parameters in pretreatment of mustard wastewater in winter (the water temperature ranges 8–15 °C) are determined: the anaerobic load is 3.0 kg (COD)/(m³·d), the average COD and phosphate concentration of the inflow are respectively 3 883 mg/L and 35.53 mg/L and the dosage of flocculent (PAC) is 400 mg/L. The anaerobic-aerobic-flocculation combined operation condition and postpositive phosphorous removal with ferrous sulfate are employed. After treatment, the COD of the effluent is 470 mg/L and the average phosphate concentration is 5.09 mg/L. The effluent could achieve the third-level of Integrated Wastewater Discharge Standard (GB 8978-1996).

Keywords

mustard wastewater / aerobic treatment / anaerobic treatment / integrated bioreactor / chemical phosphorus removal

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