复合式膜生物反应器处理干法腈纶废水启动试验研究

Starting-up Treatment of a Hybrid Membrane Bioreactor in Treatment of Acrylic Fiber Wastewater

采用新型Biofringe(BF)填料并结合A/O工艺设计了复合式膜生物反应器,采用连续进水的动态自然培养挂膜方式,并对处理干法腈纶废水做了中试启动试验。结果表明:该系统挂膜过程简单迅速,启动周期短,系统稳定性强,BF填料对反应器内的污泥具有良好的吸附效果。挂膜稳定后控制HTR为36 h,硝化液回流比为100%,进水流量为600 L/h,反应器出水水质稳定,出水NH4+-N浓度基本在5 mg/L以下,优于GB 4287—92《纺织染整工业水污染物排放标准》的一级排放标准(NH4+-N浓度小于15 mg/L),TN平均去除率可达55.86%,对腈纶废水具有较强的脱氮能力。膜的截留作用对CODCr的去除有一定的效果,对NH4+-N没有去除效果,反应器内存在同步硝化和反硝化(SND)反应。

The hybrid membrane bioreactor（HMBR）was designed by using the new biofringe（BF） filling combined with AO system.The BF biofilm was with dynamic natural cultivation and continuous water seepage,and the pilot-scale starting-up tests were carried out for treatment of acrylic fiber wastewater.The results showed that the system biofilm could be hung effectively and rapidly,with short starting-up time and stable system operation.The BF filling took good effects on adsorbing the activated sludge in the reactor.After the biofilm was hung stably with the HRT controlled at 36 h,the nitration liquid return rate at 100% and the influent flow at 600 Lh,the water quality after treatment proved to be stable and the effluent ammonia-nitrogen concentration was under 5 mgL,better than Grade 1 of the National Standard of Acrylic Fiber Industry（15 mgL,GB 4287-92）,and the average removal rate of the total nitrogen could reach 55.86%,which demonstrated that the system had good denitrification ability.The membrane interception had certain effect on the chemical oxygen demand（CODCr） removal but no effect on ammonia-nitrogen removal.Also,the simultaneous nitrification-denitrification（SND） occurred in the reactor.