重金属螯合剂TMT-15处理高含汞气田废水.pdf

化工环保
2015年第35卷第5期
ENVIRONMENTAL PROTECTION OF CHEMICAL INDUSTRY
重金属螯合剂TMT-15处理高含汞气田废水
吕维阳,刘盛余,汪雪婷,孙宇杰,能子礼超,伏倩雯
(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州省高校重点实验室,四川成都61025
[摘要]选用重金属螯合剂TMT-15处理高含汞气田废水(COD=1560mg/L,SS=210mg/L,pH=2.5~3,0,求质量
浓度为340mgL),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、三聚硫氧酸、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999%,剩余汞浓度低于GB8978-1996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。
[关键词]重金属螯合剂;三聚硫氰酸三钠盐;汞;含汞气田废水
中图分类号]x705[文献标志码]A[文章编号]1006-1878(2015)05-0459-05
Treatment of Gas Field Wastewater with High Mercury Concentration Using
Heavy Metal Chelator TM'T-15
Lii Weiyang, Liu Shengyu, Wang Xueting, Sun Yujie, Nengzi Lichao, Fu Qianwen
(Air Environmental Modeling and Polution rolling Key Laboraory of Sichuan Higher Education Institu es, College of Resources
and Environment, Chengdu University of Information Technology, Chengdu Sichuan 610225, China)
Abstract; The gas filed wastewater with high mercury concentration(COD=1 560 mg/L, SS=210 m/L, PH=2.5-
3.0, p(Hg)=340 mg/ )was treated using heavy metal chelator TMT-15. The factors affecting mercury removal were
studied such as TMT-I5 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 o
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.
Key ords: heavy metal chelator; ithioc anuric acid trisodium salt; mercury; mercury-containing gas field wastewater
高含汞气田废水是一类特殊的工业废水,其
处理含汞废水的传统方法主要有化学沉淀
水质特点为色度大,COD较高,并含有大量的无法、金属还原法、离子交换法、电解法、微生物
机盐类物质、悬浮物和重金属等,干扰到对高含量
汞的专项处理,使得气田废水无法达标排放?。[收稿日期』2015-05-08;[修订日期」2015-07-10
汞在水体中高度稳定,很难降解,若不能有效处「作者筒介1目维阳(199-)?男,江苏省盐城市人,硬士生
理,对周围的土壤、地下水系统将造成难以修复的
电话028-85966913,电邮450086739@q.com。联系人:刘盛
余,电话028-85966913,电邮ly@cuit.edu.cn。
破坏;同时,在天然气作业和气田水传输过程中会
[基金项目]教育部科学技术研究重点项目(211157);四川省
导致设备腐蚀而影响生产,也给工作人员的安全埋
杰出青年基金项目(13QN3J0110);四?省教育厅创新困队项目
下隐患?。
(14TDO020)。