城镇污水处理厂脱色工艺比选及工程应用

Comparison and engineering application of decolouration technology for municipal sewage treatment plant

针对上海南汇周浦水质净化有限公司生物处理出水色度问题,开展新型双氰胺甲醛缩聚物、臭氧脱色工艺比选试验。结果表明:臭氧脱色与新型双氰胺甲醛脱色运行费用接近,色度去除率降低12.5%,出水COD的去除率提高8.6%,不产生化学污泥,能避免新型双氰胺甲醛、聚氯化铝铁及PAM投加配比不当产生矾花难以沉降的现象,但臭氧设施设备投资额高。因此,城镇污水处理厂可根据资金状况选择合适的脱色工艺。

Aiming at the high chroma problem of the secondary biological treatment effluent at the Shanghai Nanhui Zhoupu Sewage Treatment Plant,the comparison of decolorizing effects between the new dicyandiamide formaldehyde condensation polymer and ozonation was carried out.The results showed that the operating costs of ozonation were close to the new dicyandiamide formaldehyde decoloring,but the removal efficiency of chroma for ozonation was 12.5%lower,the removal efficiency of COD was 8.6% higher,and it didn't produce chemical sludge,can avoid the the problem of sedimentation difficulty for alum flowers due to improper ratio among new dicyandiamide formaldehyde,polyaluminium chloride iron and PAM,but investment of ozonation equipment is higher.Therefore,urban sewage plant can choose suitable decoloring process according to own financial conditions.