论文部分内容阅读
钦州县制革厂以制猪皮革为主,每年废水总排放量为3万吨(其中含铬废水600吨)。废水中主要含有铬、硫化物、丹宁、脂肪、氨氮等物质。为消除铬对环境的污染,该厂1983年初建成废水铬回收处理车间。功率0.2～0.3m~8/h。一、铬废水的处理原理及工艺流程1.原理:用化学沉淀法,在含Cr~(+++)的废液中加NaOH,使Cr~(+++)生成Cr(OH)_3沉淀物,反应式为:Cr(OH)SO_4+2NaOH→Cr(OH)_3↓+Na_2SO_4,然后用真空吸滤装置将Cr(OH)_3吸滤出来,从而达到除铬的目的。
Qinzhou tannery to pigskin-based, the total annual discharge of 30,000 tons of waste water (including 600 tons of chromium wastewater). Wastewater contains chromium, sulfide, tannin, fat, ammonia nitrogen and other substances. In order to eliminate chromium pollution of the environment, the plant built in early 1983 wastewater chromium recovery workshop. Power 0.2 ~ 0.3m ~ 8 / h. First, chromium wastewater treatment principle and process 1. Principle: Chemical precipitation method, in the Cr ~ (+++) of the waste plus NaOH, Cr ~ (+++) generated Cr (OH) _3 precipitation The reaction equation is as follows: Cr (OH) SO4 + 2NaOH → Cr (OH) 3 + Na2SO4, and then the Cr (OH) 3 is filtered out by a vacuum suction filtration device so as to achieve the purpose of removing chromium.