组合式厌氧滤池(UBF)处理柠檬酸生产废水

Upflow Blanket Filter (UBF) for Treatment of Citric Acid Wastewater with Low pH and High Salt Content

在用厌氧法处理柠檬酸生产过程中产生的pH值低（3～5）、含盐量高（Cl^-=3000～5000mg／L）的离子交换废水时，遇到颗粒污泥很难形成的问题。为了解决此问题，设计和建设了4座直径为12m、高为23m、体积为2500m^3的大型组合厌氧滤池（UBF）。经过近2年的启动和实际运行，在容积负荷为3～4kgCOD／（m^3·d）、不用碱性物质调节pH值的条件下，对COD的去除率〉75％，出水SS〈200mg／L，污泥量缓慢增加，未出现堵塞现象。

When the anaerobic process was used for treatment of ion-exchange wastewater with low pH （3-5） and high salt content （Cl^- =3 000-5 000 mg/L） in citric acid production, the granular sludge was difficult to be formed. In order to solve the problem, 4 sets of large-scale UBF were designed and constructed with diameter of 12 m, height 23 m, and volume 2 500 m^3. The operation for about 2 years shows that under the volume loading of 3 -4 kgCOD/（ m^3 · d） and no pH adjustment with alkaline substances, COD removal rate is more than 75% , effluent SS is less than 200 mg/L, and sludge quantity is increased slowly without occurrence of clogging.