化学沉淀结合Fenton法预处理脱硫废液的原理与效果分析
Coupling method of precipitation and Fenton oxidation for pretreating desulfurization wastewater: mechanism and effect analysis
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摘要: 脱硫废液因含有高浓度氰化物、硫氰化物、硫化物等有毒组分而影响焦化废水处理的生物工艺.以焦化企业产生的实际脱硫废液为研究对象,选用化学沉淀-Fenton氧化的串联方法尝试预处理及分析方法的可行性,通过单因素实验,考察了硫酸亚铁投加剂量、反应前后溶液pH值、反应时间3种条件对脱硫废液中总氰及易释放氰去除效果的影响,在优化条件下对经硫酸亚铁沉淀后的脱硫废液残液进行Fenton氧化实验.结果表明,当硫酸亚铁投加量为理论值的1.2倍,H2O2投加量为COD当量的0.3倍时,可使脱硫废液的COD去除率达到76.65%,使初始浓度分别为327.7、704.6和2087.3 mg·L-1的氰化物、硫氰化物及硫化物基本得到去除,为后续生物处理创造了有利条件.化学沉淀结合Fenton法是脱硫废液预处理效率高且实用的方法.Abstract: The desulfurization wastewater is difficult to be biodegraded due to the high-concentration of toxic compounds such as cyanide compounds, thiocyanide and sulfide. The chemical precipitation and Fenton oxidation combined technology was developed to pretreat desulfurization wastewater in this study. For the chemical precipitation, the effects of FeSO4 dosages, pH and reaction time on the removal of total cyanide and volatile cyanogen were investigated. Then, Fenton oxidation was conducted for the precipitated wastewater. The experimental results indicated that with the FeSO4 dosage 1.2 times of the theoretical value and the H2O2 dosage 0.3 times of equivalent COD, cyanide (327.71 mg稬-1), thiocyanide (704.66 mg稬-1) and sulfide (2087.29 mg稬-1) can be removed completely. Therefore, the coupling method could be a potential pre-treatment method for the bio-treatment of desulfurization wastewater.
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Key words:
- chemical precipitation /
- Fenton /
- desulfurization wastewater /
- ferrous sulfate
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[1] 李军生, 李玉秀. 真空碳酸钾脱硫脱氰与HPF脱硫脱氰工艺比较[J]. 燃料与化工, 2009, 40(4): 56-57 [2] 胡金良, 郝鹏. 真空碳酸钾脱硫工艺中真空泵的技术要点[J]. 燃料与化工, 2010, 41(6): 50-52 [3] 上海科学情报研究所.国外含氰废水处理技术选编[M]. 上海:上海科学情报出版社, 1973: 1-2 [4] Kim Y M, Park D, Lee D S, et al. Inhibitory effects of toxic compounds on nitrification process for cokes wastewater treatment [J]. Journal of Hazardous Materials, 2008, 152(3): 915-921 [5] 黄会静, 韦朝海,吴超飞, 等.焦化废水生物处理A/O/H/O工艺中氰化物的去除特性[J]. 化工进展, 2011, 30(5): 1141-1146 [6] 邹家庆.工业废水处理技术[M].北京: 化学工业出版社,2003: 266 [7] 陈寿春.重要化学反应手册[M].上海: 上海科学出版社,1982: 12 [8] Park D, Kim Y M, Lee D S, et al. Chemical treatment for treating cyanides-containing effluent from biological cokes wastewater treatment process [J]. Chemical Engineering Journal, 2008, 143(1/3): 141-146 [9] Ghosh R S, Dzombak D A, Luthy R G. Equilibrium precipi-tation and dissolution of iron cyanide solids in water [J]. Environmental Engineering Science, 1999, 16(4): 293-313 [10] 范炳均. 腈纶污水预处理设计[J]. 工业用水与废水, 2002, 33(3): 51-53 [11] 陈传好, 谢波, 韦朝海, 等. Fenton试剂处理废水中各影响因子的作用机制[J]. 环境科学, 2000, 21(3): 93-96 [12] 封帆,高迎新,张昱等. Fenton氧化4-氯酚降级机制研究[J]. 环境化学, 2011(11): 1889-1893 [13] 潘霞霞, 李媛媛, 黄会静, 等. 焦化废水中硫氰化物的生物降解及其与苯酚,氨氮的交互影响[J].化工学报. 2009, 60(12): 3089-3096 [14] 王炳浚. 铁蓝法处理含氰废水[J]. 湖南冶金. 1994(1): 47-52
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