摘要
针对燃煤电厂汞污染问题,利用现有污染物设备实现汞的同步脱除是具有经济效益、环境效益与工程实用前景的一种方法。在广泛使用的湿法烟气脱硫(WFGD)系统中,研究过渡金属离子(Mn2+、Co2+、Ni 2+、Cu2+)与H2O2构成的类芬顿体系(简称M2+/H2O2体系)对烟气中Hg0的氧化脱除效果,以及不同H2O2浓度、反应温度、初始pH、SO2浓度对M2+/H2O2体系Hg0脱除效果的影响。结果表明,类芬顿试剂能有效促进烟气中Hg0的脱除,脱汞率随着H2O2浓度和过渡金属阳离子浓度增加而提高,且各过渡金属离子的催化氧化作用为Co2+>Mn2+>Ni 2+>Cu2+。初始pH能促进M2+/H2O2体系Hg0的脱除,SO2的存在会起到一定抑制作用,反应温度会影响该系统对Hg0的脱除效果,脱汞最佳反应温度为55℃,符合工程运行条件。可见,采用直接向脱硫浆液中加入添加剂的方法能有效控制燃煤电厂汞污染,且该方法操作简单,具有很好的工业应用前景。
For mercury pollution in coal-fired power plant,the use of existing equipment to realize simultaneous removal of pollutants is a method with economic benefits,environmental benefits and engineering practical prospects.Experiments were taken in wet flue gas desulfurization（WFGD）system which was widely used in coal-fired power plant to investigate the effect of Fenton system composed of transition metal（Mn2＋,Co2＋,Ni 2＋,Cu2＋）and hydrogen peroxide（H2O2）on zero-valent mercury（Hg0）removal efficiency,as well as the effect of slurry temperature,initial pH and sulfur dioxide（SO2）on M2＋/H2O2 system.The results showed that Fenton system could effectively promote mercury removal in flue gas.With the increase of H2O2 and transition metal concentration,mercury removal efficiency（MRE）was enhanced respectively,and the catalytic oxidation of various metal ions sizes were：Co2＋〉Mn2＋〉Ni 2＋〉Cu2＋.Additionally,pH could promote the removal of mercury in M2＋/H2O2 system,while the presence of SO2 would restrain this role,reaction temperature would affect MRE in WFGD system.And the optimal reaction temperature on mercury removal was 55 ℃,which met project operating conditions.Therefore,it is obvious that the addition of Fenton to slurry directly can effectively control mercury pollution in coal-fired power plant with simple operation and good prospects on industrial applications.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2015年第6期29-33,共5页
Environmental Pollution & Control
基金
南方电网科技项目(No.K-GD 2012-360)
关键词
汞
类芬顿试剂
催化氧化
脱除
mercury
Fenton
catalytic oxidation
removal
