摘要
印染行业产生的碱减量废水因其高COD和强碱性等特点难以处理。本研究利用含有钙盐的改良型混凝沉淀法和酸析法分别对某企业碱减量废水进行处理,并对药剂的选择、反应温度、反应时间和反应pH进行了探讨。结果表明:18℃条件下,调节pH=10,CaCl2最佳投加浓度6 g/L,混凝后废水COD降低75%;调节pH=3,投加PAM进行酸析处理,COD去除率为77%,回收的TA纯度为92%。结合企业要求与废水特点,改良型混凝沉淀法为现阶段适宜的处理方案。
Alkali decrementwastewater produced by printing and dyeing industries is difficult to treat because of its high COD and strong alkaline. In this paper, pretreatmentof alkali deerementwastewaterusingthe method of coagulation with calcium salts and acideduction were discussed. Various influencing factors such as selection of reagents, reaction temperature, reaction time, pHval- ue were discussed as well. The results indicated that the value of COD decreased 75% by coagulationat 18℃. The most economi- cal dosage ofCaC12 is 6 g/Land floceulation pH is 10. When pH is 3, COD removal effieiencyreached 77% and terephthalie acid can be recycled with a purity of 92% by acid eduction. PAM was added in this procedure. Based on the business demand and the wastewater characteristics, coagulation method should be used in preference.
出处
《环境科学与管理》
CAS
2013年第10期147-152,共6页
Environmental Science and Management
关键词
碱减量废水
混凝沉淀
酸析
alkali decrementwastewater
coagulation
acideduction
