印染废水膜后浓水的深度处理工艺研究

Study on Advanced Treatment Process of Membrane Concentrate of Printing and Dyes Wastewater

采用Fenton法+反硝化生物滤(DN)池的深度处理工艺处理印染废水膜后(RO)浓水,考察了H_(2)O_(2)加药量、FeSO_(4).7H_(2)O加药量、初始pH值和反应时间对Fenton法去除COD的影响,以及C/N、水力停留时间(HRT)对DN池去除NO^(-)_(3)-N的影响。研究结果表明:在初始pH值为4,FeSO_(4).7H_(2)O和H_(2)O_(2)的投加量分别为450mg/L、90mg/L,反应时间为1.5h时,COD去除率达到62%,出水COD71mg/L,色度15倍;DN池在C/N为8,HRT为2h时,出水NO^(-)_(3)-N降低至0.52mg/L,NO^(-)_(3)-N去除率达到96.8%。RO浓水经上述工艺处理后出水水质稳定达到《纺织染整工业水污染物排放标准》(GB4287-2012)表2限值。

Theadvanced treatment process of Fenton and denitrification biofilter was used to treat membrane concentrate of printing and dyes wastewater.The effects ofH2O_(2)dosage,FeSO_(4).7H2Odosage,initial pH value and reaction time on removal of COD by Fenton and the effects of C/N and HRT on removal of NO^(-)_(3)-N by denitrification biofilter were investigated.The results showed that when the initial pH value was 4,the dosage of H2O_(2) was 90mg/L,the dosage of FeSO_(4).7H2O was 450mg/L and the reaction time was 1.5h,the COD removal rate reached 62%,the effluent COD was 71 mg/L and the Chroma was 15 times.When the C/N was 8,the HRT was 2h,the effluent NO^(-)_(3)-N of denitrification biofilter was reduced to 0.52mg/L,and the removal rate of NO^(-)_(3)-N was 96.8%.The effluent quality of membrane concentrated waterby the above process has reached the table 2 limit value of"Textile Dyeing and finishing industry water pollutant discharge standard"(GB4287-2012).