腈纶纱染色废水预处理工程的设计与运行

为使厂内处理水质达到接管标准，采用水解／塔式生物滤池和混凝沉淀工艺作为腈纶纱染色废水预处理工艺。工程运行表明，原水COD≤1600mg／L时，适当增大回流量，水解／塔式生物滤池对COD的去除率可达57％；再经混凝沉淀处理，可去除45％的COD，出水COD〈380mg／L，能满足接管要求。另外，出水色度、SS也优于接管标准。因此，采用上述工艺对腈纶纱印染废水进行预处理在技术上是可行的，经济上也是可以接受的（运行费用为1．82元／m^3）。

Design and Operation of Pretreatment Project of Acrylon Yarn Dyeing Wastewater

In order to meet the influent requirement of subsequent WWTP, hydrolysis/tower biological filter and coagulation sedimentation process were used to pretreat acrylon yarn dyeing wastewater. The operation indicates that when the raw wastewater COD is equal to or less than 1 600 mg/L, and the quantity of recycle is increases properly, the COD removal rate by hydrolysis/tower biological filter can reach 57%. After the treatment of coagulation sedimentation, the COD removal rate can reach 45% with the effluent COD of less than 380 mg/L, meeting the influent requirement. In addition, the effluent color and SS are superior to the influent requirement. In conclusion, the pretreatment of acrylon yarn dyeing wastewater by the processes above-mentioned is technically and economically feasible. The operation cost is 1.82 Yuan/m^3.