某火电厂湿法脱硫废水水质分析及处理工艺优化
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摘要
根据新疆某大型火电厂化学沉淀法脱硫废水处理系统进、出口水质监测结果,分析其出水水质超标原因及工艺设计缺陷,以使该火电厂脱硫废水处理系统出水水质达到DL/T 997-2006要求,并满足后续处理工艺的进水要求。提出脱硫废水处理系统工艺优化对策:在原三联箱处理单元前设置沉降池并更换曝气设备,能够有效降低进水的悬浮物含量和COD;增加二级软化+微滤预处理工艺;增加深度处理工艺,即高压纳滤+冷冻结晶+高压反渗透(RO)+蒸发结晶工艺。可使脱硫废水能够最大限度的进行回用,溶解盐被分质结晶,实现真正意义上的"零排放"。
According to the monitoring results of the influent and effluent quality of the desulphurization wastewater treatment system by chemical precipitation method in a large-scale thermal power plant in Xinjiang. The cause of exceeded standard of the effluent quality and the defect of the process design were analyzed, so that the effluent quality of the desulfurization wastewater treatment system of the thermal power plant reached DL/T 997-2006 requirements, and met the follow-up process of influent water requirements. The optimization measures of desulfurization wastewater treatment system were proposed. The sedimentation tank was installed in front of the original triple-tank treatment unit and the aeration equipment was replaced to effectively reduce the suspended solids content and COD in influent; to add two-stage softening and microfiltration pretreatment process; to increase advanced treatment process, that was high-pressure nanofiltration +frozen crystallization +high pressure reverse osmosis(RO) +evaporation crystallization process.The desulfurization wastewater could be reuse maximum, and dissolved salt was qualitative and quantitative crystallization, to achieve a real sense of zero emission.
According to the monitoring results of the influent and effluent quality of the desulphurization wastewater treatment system by chemical precipitation method in a large-scale thermal power plant in Xinjiang. The cause of exceeded standard of the effluent quality and the defect of the process design were analyzed, so that the effluent quality of the desulfurization wastewater treatment system of the thermal power plant reached DL/T 997-2006 requirements, and met the follow-up process of influent water requirements. The optimization measures of desulfurization wastewater treatment system were proposed. The sedimentation tank was installed in front of the original triple-tank treatment unit and the aeration equipment was replaced to effectively reduce the suspended solids content and COD in influent; to add two-stage softening and microfiltration pretreatment process; to increase advanced treatment process, that was high-pressure nanofiltration +frozen crystallization +high pressure reverse osmosis(RO) +evaporation crystallization process.The desulfurization wastewater could be reuse maximum, and dissolved salt was qualitative and quantitative crystallization, to achieve a real sense of zero emission.
引文
[1]王敏琪.火电厂湿式烟气脱硫废水特性及处理系统研究[D].浙江工业大学,2013.
[2]聂鹏飞.600MW机组湿法脱硫废水处理系统的优化改造[J].热力发电,2011,10:62-65.
[3]杨发祥.浅谈电厂脱硫废水及其处理工艺[J].中国高新技术企业,2010,04:105-107.
[4]莫华,吴来贵,周加桂.燃煤电厂废水零排放系统开发与工程应用[J].合肥工业大学学报(自然科学版),2013,11:1368-1372.
[5]肖连娟.改性粉煤灰应用于湿法烟气脱硫废水处理的实验研究[D].北京:华北电力大学,2013.
[6]刘海洋,江澄宇,谷小兵,等.燃煤电厂湿法脱硫废水零排放处理技术进展[J].环境工程,2016,34(4):33-36.
[7]费锡智,张琪,杨茹,等.火电厂脱硫废水处理工程实例[J].水处理技术,2015,41(05):128-131+135.
[8]诸剑锋.脱硫废水水质超标原因分析及解决对策[J].工业用水与废水,2015,46(3):32-34.
[9]刘海洋,夏怀祥,江澄宇,等.燃煤电厂湿法脱硫废水处理技术研究进展[J].环境工程,2016,34(01):31-35.
[10]莫华,吴来贵,周加桂.燃煤电厂废水零排放系统开发与工程应用[J].合肥工业大学学报(自然科学版),2013,11:1368-1372.
[11]火电厂石灰石-石膏湿法脱硫废水水质控制指标:DL/T 997-2006[S].
[12]火电厂排水水质分析方法:DL/T 938-2005[S].
[13]叶春松,罗珊,张弦,等.燃煤电厂脱硫废水零排放处理工艺[J].热力发电,2016,09:105-108.
[14]禾志强,田雁冰,赵全中,等.火力发电厂烟气脱硫废水处理工程实例[J].工业用水与废水,2008(5):83-85.
[15]汤兴,朱芳芳,杜翠苹.火电厂实现废水零排放途径的探讨[J].净水技术,2016(4):117-120.
[16]应春华,杨宝红,刘柏辉,等.火电厂脱硫废水处理试验研究[J].热力发电,2005,(06):45-47.
[17]袁国全,张江涛,潘振波,等.脱硫废水预处理系统软化设备的调试和分析[J].热力发电,2011,40(2):76-78.
[2]聂鹏飞.600MW机组湿法脱硫废水处理系统的优化改造[J].热力发电,2011,10:62-65.
[3]杨发祥.浅谈电厂脱硫废水及其处理工艺[J].中国高新技术企业,2010,04:105-107.
[4]莫华,吴来贵,周加桂.燃煤电厂废水零排放系统开发与工程应用[J].合肥工业大学学报(自然科学版),2013,11:1368-1372.
[5]肖连娟.改性粉煤灰应用于湿法烟气脱硫废水处理的实验研究[D].北京:华北电力大学,2013.
[6]刘海洋,江澄宇,谷小兵,等.燃煤电厂湿法脱硫废水零排放处理技术进展[J].环境工程,2016,34(4):33-36.
[7]费锡智,张琪,杨茹,等.火电厂脱硫废水处理工程实例[J].水处理技术,2015,41(05):128-131+135.
[8]诸剑锋.脱硫废水水质超标原因分析及解决对策[J].工业用水与废水,2015,46(3):32-34.
[9]刘海洋,夏怀祥,江澄宇,等.燃煤电厂湿法脱硫废水处理技术研究进展[J].环境工程,2016,34(01):31-35.
[10]莫华,吴来贵,周加桂.燃煤电厂废水零排放系统开发与工程应用[J].合肥工业大学学报(自然科学版),2013,11:1368-1372.
[11]火电厂石灰石-石膏湿法脱硫废水水质控制指标:DL/T 997-2006[S].
[12]火电厂排水水质分析方法:DL/T 938-2005[S].
[13]叶春松,罗珊,张弦,等.燃煤电厂脱硫废水零排放处理工艺[J].热力发电,2016,09:105-108.
[14]禾志强,田雁冰,赵全中,等.火力发电厂烟气脱硫废水处理工程实例[J].工业用水与废水,2008(5):83-85.
[15]汤兴,朱芳芳,杜翠苹.火电厂实现废水零排放途径的探讨[J].净水技术,2016(4):117-120.
[16]应春华,杨宝红,刘柏辉,等.火电厂脱硫废水处理试验研究[J].热力发电,2005,(06):45-47.
[17]袁国全,张江涛,潘振波,等.脱硫废水预处理系统软化设备的调试和分析[J].热力发电,2011,40(2):76-78.