According to the characteristics of wastewater from waste paint buckets cleaning such as:high pH value,high COD and SS concentrations,poor biodegradability and so on,a combined process of acid neutral-ization-air flotation-coagulation sedimentation-ozone oxidation-hydrolytic acidification-anoxic-aerobic-MBR was adopted in the design for its treatment.The operation results of the project showed that,when the mass concen-trations of COD,BOD5 and SS in the influent water were 3 750,900 and 450 mg/L respectively,the colority was 420 degree,the relevant indexes of the effluent water were 110,15,5 mg/L and 15 degree respectively.The ef-fluent water quality met the requirement of washing water standard specified in table 1 of GB/Ti 19923-2005 The reuse of urban recycling water-Water quality standard for industrial uses.The said process has characteris-tics of stable operation,easy manipulation,low investment and operation cost,saving water resources and so on,which achieves good economic and environmental benefits.
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