两级A/O+铁盐耦合沉淀组合工艺处理酞菁铜生产废水

Treatment of copper phthalocyanine production wastewater by two-stage A/O+iron salt coupled sedimentation combined process

经除铜预处理后的酞菁铜生产废水含有大量难生物降解的酞菁等含氮有机物,采用传统的“生物处理+深度处理”组合工艺处理该废水时,处理效果不稳定,且出水总氮(TN)难以达标。采用“两级A/O+铁盐耦合沉淀”组合工艺处理该废水,考察其处理效果,并利用荧光光谱、紫外光谱、腐殖质(HS)含量测定探究废水中污染物的去除机理。结果表明,“两级A/O+铁盐耦合沉淀”组合工艺处理酞菁铜生产废水,化学需氧量(COD)、氨氮、TN的去除率分别为96.5%、99.8%、93.2%;两级A/O可有效去除废水中绝大部分污染物,并使出水中HS含量提高,再利用对HS和有机氮具有高效去除作用的铁盐耦合沉淀技术处理两级A/O出水,使最终出水的COD、氨氮、TN分别为29、0.5、23.8 mg/L,实现了出水达标排放。

Copper phthalocyanine production wastewater after copper removal pretreatment contains large amounts of nitrogen-containing organic compounds such as phthalocyanine,which are difficult to biodegrade.The traditional combined process of“biological treatment and advanced treatment”was used to treat this wastewater,but the effect was unstable and the total nitrogen(TN)in the effluent was difficult to reach the standard.The combined process of“two-stage A/O and iron salt coupled sedimentation”was used to treat the wastewater.The treatment effect was investigated,and the removal mechanism of pollutants in the wastewater by fluorescence spectrum,ultraviolet spectrum and humus substances(HS)content determination were exeplored.The results showed the combined process of“two-stage A/O and coupled sedimentation”treated copper phthalocyanine production wastewater,the removal rates of chemical oxygen demand(COD),ammonia nitrogen and TN were 96.5%,99.8%and 93.2%,respectively.Two-stage A/O treatment could effectively remove most of the pollutants,and increased the content of HS in the twostage A/O effluent.Then,the two-stage A/O effluent was treated by iron salt coupled sedimentation,which had good removal effect on HS and organic nitrogen.The final effluent COD,ammonia nitrogen and TN concentrations were 29,0.5 and 23.8 mg/L,respectively,meeting the effluent discharge standard.