Abstract:

In view of the characteristics of printing and dyeing wastewater with complex water quality，high organic content，and difficult degradation，the “hydrolysis acidification-aerobic biochemical-enhance membrane bio-reactor（EMBR）-reverse osmosis（RO）-electro-catalytic oxidation with pulse（ECOP）” coupling process was used to transform printing and dyeing wastewater treatment unit of a dyeing factory. The actual operation of the project showed that the combined process could effectively reduce the COD and chroma，but the removal effect of total nitrogen was not obvious in dyeing wastewater. The COD content of the EMBR system influent was below 120 mg/L. The concentration of the pollutants in the effluent was lower than the limit value in Table 2 of “Discharge Standard of Water Pollutants for Textile Dyeing and Finishing Industry”（GB 4287—2012）. The water reuse rate of the whole process increased from 70% to 86%. The annual water saving was 58 000 t，and the annual expenditure was reduced by more than 360 000 yuan.

Key words: printing and dyeing wastewater, advanced treatment of RO concentrated water, wastewater reuse

摘要：

针对印染废水水质复杂、有机物含量高、难降解的特点，采用“水解酸化—好氧生化—增强生物膜反应器（EMBR）—反渗透（RO）—电催化氧化（ECOP）”耦合工艺对某印染厂印染废水处理工艺进行改造，工程实际运行情况表明，该组合工艺能有效降低印染废水中的COD和色度，但对总氮的去除效果不明显。EMBR系统进水COD在120 mg/L以下，出水经RO浓缩3.3倍后，RO浓水进入ECOP系统进行深度处理，其出水污染物浓度低于《纺织染整工业水污染物排放标准》（GB 4287—2012）中表2限值。整个工艺产水回用率由70%提高至86%，年节约用水5.8万t，年减少支出36万余元。

关键词: 印染废水, RO浓水深度处理, 污水回用

CLC Number: 

• X703