The scale of a centralized wastewater treatment plant in a printing and dyeing park in eastern Guangdong Province is 75 000 m3/d.The effluent is partially discharged into the sea and partially reused.The sea discharge section adopts coagulation sedimentation-hydrolysis acidifica-tion-AAO-MBR-ozone treatment process.The subsequent reuse process is compared in terms of treatment effect,engineering risk,investment,operating cost and maintenance,and then activa-ted carbon adsorption and regeneration process is adopted.After the activated carbon adsorption tank was put into actual operation,its effluent COD remained below 50 mg/L within a saturation cycle of 130 days,with an average removal rate of about 45％.The regenerated activated carbon used was tested,and its iodine value regeneration rate and methylene blue value regeneration rate were over 90％and 80％,respectively.The results show that the activated carbon adsorption and regeneration process meets the requirements of effluent quality,saves investment,occupies less land,generates no concentrated water,and effectively reduces operating costs.
维普
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