多级微氧生物流化床预处理高浓度丙烯酸废水

Pretreatment of High-Concentration Acrylic Acid Wastewater by the Multi-Stage Microaerobic Biological Fluidized Bed Reactor

采用多级微氧生物流化床反应器预处理高浓度丙烯酸废水,考察了进水负荷的影响,并对丙烯酸的降解产物进行了分析.结果表明,反应器在水力停留时间为12 h,水温25℃,进水丙烯酸为3 000～9 000 mg.L-1,丙烯酸容积负荷为6.0～18.0kg.(m3.d)-1的条件下,对丙烯酸去除率在95%以上,COD去除率为15%～30%,出水中丙烯酸浓度<150 mg.L-1.丙烯酸降解的主要中间产物为乙酸和丙酸,平均每1.00 mol的丙烯酸可转化成0.22 mol乙酸和0.36 mol丙酸.多级微氧生物流化床可实现丙烯酸废水的高负荷预处理.

A multi-stage microaerobic biological fluidized bed reactor was used for the pretreatment of synthetic wastewater containing high concentration of acrylic acid（AA）.The effect of influent load was investigated and the intermediate products of acrylic acid degradation were analyzed.It indicated that the removal rate of AA was above 95% with effluent acrylic acid less than 150 mg·L^-1 and COD removal rate of 15%-30%,under the following conditions： hydraulic retention time of 12 h,waste water temperature of 25℃,influent acrylic acid concentration of 3 000-9 000 mg·L^-1,volume load of 6.0-18.0 kg·（m^3·d）^-1.The main intermediate products of acrylic acid degradation were acetic and propionic acids.The multi-stage microaerobic biological fluidized bed reactor can transform each 1.00 mol acrylic acid into 0.22 mol acetic acid and 0.36 mol propionic acid,and achieve the pretreatment of acrylic acid wastewater at high loads.