印染退浆废水中聚乙烯醇回收设备的开发和应用

Development and application of polyvinyl alcohol recovery equipment in dyeing desizing wastewater

针对前处理退浆废水中聚乙烯醇（PVA）是导致废水COD含量超高的主要因素,利用盐析法回收退浆废水中PVA的原理,开发PVA回收设备达到连续自动化生产、有效回收废水中的PVA并重新利用目的;退浆废水中PVA回收率可达85%~90%,废水中COD含量由19 500 mg/L降至3 000 mg/L,大大降低了后续污水的处理压力且易达到国家排放标准;物料循环利用降低了成本,也有效降低废水中COD的含量,实现绿色环保生产的目的。

Polyvinyl alcohol is a major factor resulting in the uhra-high content of COD in desizing pretreatment wastewater. The PVA recycling equipment is developed to recycle PVA from desizing wastewater nsing the principles of salting-out method. The equipment is able to recycle and reuse PVA from wastewater effectively with the continuous and automatic production system. Recycle rate of PVA from desizing wastewater is up to 85%-90%, and the COD content of wastewater was reduced from 19 500 mg/L to 3 000 rag/L, which reduced the pressure on the subsequent treatment of dyeing wastewater and easily reached the national emission standards. By recycle use of materials, the COD content in wastewater is efficiently reduced and the purpose of environment-friendly production is achieved.