A/O/BAF/亚滤技术深度处理针织印染废水研究

A Study on the Reclamation of Knitting Printing and Dyeing Wastewater by Using a Pilot-Scale A/O/BAF/Sub-Filter Process

印染废水由于色度高、水质变化大、生化性差等特点，是当前工业废水处理的难点和焦点之一。针对印染废水的危害及我国水资源短缺的现状，采用中试规模（300t／d）的水解酸化-接触氧化-曝气生物滤池-亚滤技术（A／O／BAF／亚滤技术）对针织印染废水进行深度处理研究。结果表明：进水在一定范围波动时，出水水质稳定，出水CODCr〈50mg／L，色度〈2倍，浊度〈1度，水质指标优于建设部生活杂用水水质标准（CJ25．1-89）．其中CODc。色度、浊度的平均去除率分别为91％、95％、96％以上。通过3个多月的生产实验证明：针织印染废水经A／O／BAF／亚滤技术深度处理后，能满足染整工艺对水质的要求；且该工艺具有剩余污泥少，耐冲击负荷能力强，色度、浊度、难降解有机物去除效率高等优点。中试研究表明：该技术操作简单、易于管理，可为工业化规模应用提供技术参考。

Wastewater from printing and dyeing has become one of difficult problems and foci in trade wastewater treatment owing to its high colourity, variable strength and poor biodegradability. The harmfulness of such a kind of wastewater and the scarcity of water resources in China were reviewed. A study in pilot-scale facility to handle 300 m^3 per day was conducted on advanced treatment of knitting printing and dyeing wastewater by a process of hydrolysis acidification - biological contact oxidation - biological aerated filter - sub-filter technology （A/O/BAF/sub-filter technology）. The investigation has indicated that CODc, colourity and turbidity in the effluent kept stable at the levels of less than 50 mg/L, 2 times and 1 NTU, respectively, even if the influent had fluctuated within certain ranges. After over three months＇ running of the process, it has shown that the removal efficiencies of CODcr, colourity, turbidity reached 91%, 95% and 96%, respectively, on the average and the effluent was in compliance with the domestic gray water standard （CJ 25.1-89）. The treated effluent could satisfy the water quality requirement for printing and dyeing processing. This process showed advantages such as less residual sludge, stronger shock load endurance, and higher efficiencies of removing colourity, turbidity and refractory organics. The pilot-scale test has revealed that this process was stable in performance, simple in operation, and easy in management, so as to provide a reference for its industrial scale application to the advanced treatment of textile wastewater.