重金属螯合剂TMT-15处理高含汞气田废水  

Treatment of Gas Field Wastewater with High Mercury Concentration Using Heavy Metal Chelator TMT-15

作　　者：吕维阳 刘盛余[1] 汪雪婷[1] 孙宇杰[1] 能子礼超[1] 伏倩雯 

机构地区：[1]成都信息工程大学资源环境学院大气环境模拟与污染控制四川省高校重点实验室,四川成都610225

出　　处：《化工环保》2015年第5期459-463,共5页Environmental Protection of Chemical Industry

基　　金：教育部科学技术研究重点项目(211157);四川省杰出青年基金项目(13QNJJ0110);四川省教育厅创新团队项目(14TD0020)

摘　　要：选用重金属螯合剂TMT-15处理高含汞气田废水（COD=1 560 mg/L,SS=210 mg/L,pH=2.5～3.0,汞质量浓度为340 mg/L）,考察了TMT-15投加量,废水pH,与氢氧化物、硫化物联用等因素对汞去除效果的影响,分析了TMT-15与汞的螯合产物的稳定性.实验结果表明：TMT-15能与汞强力螯合并沉淀,投加量低,pH适用范围广;絮凝剂聚合硫酸铝与TMT-15的联用可提高除汞效果,但作用有限;TMT-15与氢氧化物联用时的汞的去除效果提升显著,在氢氧化钠、三聚硫氰酸、汞元素的摩尔比为0.5：0.5：1和废水pH为3.0的条件下,汞去除率可达99.99％,剩余汞浓度低于GB 8978-1996中规定的汞排放浓度;螯合产物具有很高的热稳定性,且在较高浓度的酸碱环境中溶解率低,对环境造成二次污染的风险小.The gas filed wastewater with high mercury concentration （COD=1560 mg/L, SS=210 mg/L, pH=2.5- 3.0, ρ （Hg）=340 mg/L）was treated using heavy metal chelator TMT-15. The factors affecting mercury removal were studied, such as TMT-15 dosage, wastewater pH, hydroxide, sulfide and so on, and the stability of the chelation product was analyzed. The experimental results show that： TMT- 15 can chelate and precipitate with mercury under low dosage and wide pH range; The combination of flocculant PAS and TMT-15 has limited effect on mercury removal; When TMT-15 is used with hydroxide, the mercury removal rate is increased significantly; Under the conditions of mole ratio of sodium to trithiocyanuric acid to mercury 0.5 ： 0.5 ： 1 and wastewater pH 3.0, the mercury removal rate reaches 99.99%, and the residual mercury concentration is below the mercury emission standard of GB 8978-1996; The chelation product has high thermal stability and low dissolution rate in high-concentration acid/base environment, which indicates that it has low risk of secondary environmental pollution.

关 键 词：重金属螯合剂 三聚硫氰酸三钠盐 汞 含汞气田废水 

分 类 号：X705[环境科学与工程—环境工程]