PACT-UF组合工艺深度处理工业废水的中试

开展了PACT-UF组合工艺深度处理某工业废水的中试研究,探讨了粉末活性炭(PAC)投加量、炭浆回流比、曝气方式等对组合工艺去除COD和色度的影响,并分析了不同工况下膜污染情况。结果表明:PACT-UF组合工艺连续运行45 d后可稳定去除废水中的COD和色度物质,出水水质满足《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级A标准;PACTUF系统稳定后,随着投炭量的增大,出水水质提升,综合考虑投炭量为60~80 mg/L比较合适;提高回流比可有效提高COD和色度去除率,回流比为150%~200%较合适;增大回流比能延缓归一化膜比通量的下降趋势,有效改善超滤膜的污染程度,利于延长膜使用寿命。

Pilot-scale Study on Combined Process of PACT-UF for Industrial Wastewater Advanced Treatment

A pilot-scale study on PACT-UF process was carried out for the advanced treatment of industrial wastewater. The influencing factors including dosage of powdered activated carbon (PAC),recycling ratio of carbon slurry,and aeration mode on the removal of COD and color were investigated.The membrane fouling situations under different working conditions were also analyzed. The results indicated that stable removal of COD and color was achieved after 45-day of continuous operation,and the effluent met the first level A standard specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). The effluent quality of PACT-UF process was improved as the increase of PAC dosages after the system was stabilized,and it was determined that the dosage of 60-80 mg/L was suitable. The removal efficiency of COD and color was enhanced as the recycling ratio of carbon slurry was increased,and a recycling ratio of 150%-200% was suitable. The increase of recycling ratio could postpone the decline of normalized membrane specific flux,improve the UF membrane fouling degree,which was beneficial to extending the membrane life expectancy.