珠海电厂精处理系统再生废水综合利用改造方案
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摘要
针对珠海电厂凝结水精处理系统再生废水氨氮含量严重超标问题,在摸清水量、水质特点和分析全厂废水氨氮排放状况的基础上,提出了脱气膜氨氮去除、反渗透浓缩-电解制氯和氨氮吹脱-磷酸吸收-回用渣水系统3种废水综合利用工艺方案,并进行了深入的对比研究。结果表明:利用吹脱吸收工艺对凝结水精处理系统再生废水中大部分氨氮予以去除后,将其补入渣水系统的综合利用方案最具可行性,投资和运行费用均比较低,工艺成熟可靠;同时采用磷酸溶液吸收含氨尾气,生成有用的肥料,无二次污染。珠海电厂采用该方案并于2018年实施,投运近半年来,精处理再生废水氨氮平均质量浓度由原来的280～420mg/L降至30～60 mg/L,去除效率稳定在85%以上,优于设计指标。
Regarding the problem of excessive ammonia nitrogen content in reclaimed wastewater of condensate treatment system in Zhuhai power plant, three kinds of comprehensive utilization programs, i.e., membrane absorption, reverse osmosis concentrationelectrolysis and ammonia stripping-phosphoric acid absorption-reuse to slag water system, were put forward and a thorough comparative study was carried out on the basis of the investigation of water quantity and water quality characteristics and the analysis of ammonia nitrogen discharge of the whole plant wastewater. The results show that after the removal of most ammonia nitrogen in the regenerated wastewater through the process of blowing and absorption, the comprehensive utilization scheme that reuse this part of the wastewater to the slag water system is the most feasible solution with low investment and operating costs while the application techniques are mature and reliable. Meanwhile, phosphoric acid solution is used to absorb ammonia tail gas to produce useful fertilizers without secondary pollution. The scheme was adopted by Zhuhai power plant and implemented in 2018. The actual operation effect is satisfactory. After the operation into service for nearly half a year, the average concentration of ammonia nitrogen from recycled wastewater was reduced from 280～420 mg/L to 30～60 mg/L, and the removal efficiency was over 85%, which exceed the requirements of design specifications.
Regarding the problem of excessive ammonia nitrogen content in reclaimed wastewater of condensate treatment system in Zhuhai power plant, three kinds of comprehensive utilization programs, i.e., membrane absorption, reverse osmosis concentrationelectrolysis and ammonia stripping-phosphoric acid absorption-reuse to slag water system, were put forward and a thorough comparative study was carried out on the basis of the investigation of water quantity and water quality characteristics and the analysis of ammonia nitrogen discharge of the whole plant wastewater. The results show that after the removal of most ammonia nitrogen in the regenerated wastewater through the process of blowing and absorption, the comprehensive utilization scheme that reuse this part of the wastewater to the slag water system is the most feasible solution with low investment and operating costs while the application techniques are mature and reliable. Meanwhile, phosphoric acid solution is used to absorb ammonia tail gas to produce useful fertilizers without secondary pollution. The scheme was adopted by Zhuhai power plant and implemented in 2018. The actual operation effect is satisfactory. After the operation into service for nearly half a year, the average concentration of ammonia nitrogen from recycled wastewater was reduced from 280～420 mg/L to 30～60 mg/L, and the removal efficiency was over 85%, which exceed the requirements of design specifications.
引文
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[2]金绪良,李永立,王应高,等.精处理高速混床树脂再生动态试验研究[J].热力发电,2014,43(4):49-53.JIN Xuliang,LI Yongli,WANG Yinggao,et al.Dynamic monitoring test on resin regeneration of condensate polishing mixed bed[J].Thermal Power Generation,2014,43(4):49-53.
[3]李锐,何世德,张占梅,等.凝结水精处理现状及新技术应用研究[J].水处理技术,2009,35(2):25-28.LI Rui,HE Shide,ZHANG Zhanmei,et al.Condensate polishing treatment status and application of new technologies[J].Technology of Water Treatment,2009,35(2):25-28.
[4]李斌,李建锋,吕俊复,等.我国大型循环流化床锅炉机组运行现状[J].锅炉技术,2012,43(1):22-28.LI Bin,LI Jianfeng,LU Junfu,et al.Status of large scale circulating fluidized bed boiler operation in China[J].Boiler Technology,2012,43(1):22-28.
[5]王锋涛,王玉秀.凝结水精处理混床铵化运行条件的分析探讨[J].工业水处理,2003,23(5):68-69.WANG Fengtao,WANG Yuxiu.Analyzing and discussing the conditions of the ammonia cycle condensate polishing[J].Industrial Water Treatment,2003,23(5):68-69.
[6]喻军,张占平,高文峰.火电厂离子交换树脂再生废水处理及减排[J].电力环境保护,2008,24(6):7-9.YU Jun,ZHANG Zhanping,GAO Wenfeng.Discussion on treatment process of ion exchange resin regeneration drain water in thermal power plants and its reduction[J].Electric Power Environmental Protection,2008,24(6):7-9.
[7]张福常,杨培育.西柏坡电厂废水零排放工程的设计与施工[J].电力建设,2001,22(1):23-27.ZHANG Fuchang,YANG Peiyu.Design and construction of zero discharge project for waste water in Xibaipo power plant[J].Electric Power Construction,2001,22(1):23-27.
[8]乐园园.火电厂氨氮废水来源及处理可行性探讨[J].电力科技与环保,2016,32(4):16-18.LE Yuanyuan.Source and treatment possibility of thermal power plant ammonia nitrogen wastewater[J].Electric Power Technology and Environmental Protection,2016,32(4):16-18.
[9]姜瑞,曾红云,王强.氨氮废水处理技术研究进展[J].环境科学与管理,2013,38(6):131-134.JIANG Rui,ZENG Hongyun,WANG Qiang.Research progress of ammonia nitrogen wastewater treatment technology[J].Environmental Science and Management,2013,38(6):131-134.
[10]王璟,王园园,赵剑强,等.火电厂高盐高氨氮废水电解除氨氮及制氯性能研究[J].工业水处理,2015,35(7):60-64.WANG Jing,WANG Yuanyuan,ZHAO Jianqiang,et al.Research on the capacity for removing ammonia nitrogen from wastewater containing high salinity and high ammonia nitrogen and the capacity for producing chloride by electrolysis in a thermal power plant[J].Industrial Water Treatment,2015,35(7):60-64.
[11]秦英杰,郝兴阁,崔东胜,等.聚四氟乙烯中空纤维气态膜过程用于废水中氨氮的脱除/回收/纯化[C]//中国化工学会年会.北京,2015.
[12]陈卫文.膜吸收技术用于处理高氨氮废水的研究[J].膜科学与技术,2016,36(5):95-100.CHEN Weiwen.Research on the treatment of high ammonia wastewater by the membrane absorption[J].Membrane Science and Technology,2016,36(5):95-100.
[13]连坤宙,胡特立,王璟,等.离子交换再生废水资源化研究及系统设计与应用[J].中国电力,2017,50(11):168-174.LIAN Kunzhou,HU Teli,WANG Jing,et al.Study on process design and application of the resourcfulization of regenerated wastewater using ion-exchange resin method[J].Electric Power,2017,50(11):168-174.
[14]王园园.火电厂反渗透浓水电解除氨氮及制氯性能研究[D].西安:长安大学,2015.
[15]吴火强,刘亚鹏,王璟,等.脱硫废水膜浓缩浓水电解制氯工艺分析[J].热力发电,2016,45(9):105-115.WU Huoqiang LIU Yapeng WANG Jing,et al.Process of producing chlorine by electrolyzing membrane-concentrated desulfurization wastewater[J].Thermal Power Generation,2016,45(9):105-115.
[16]毛进,张志国,连坤宙,等.火电厂脱硫废水资源化回用处理工艺研究[J].水处理技术,2017,43(6):41-44.MAO Jin,ZHANG Zhiguo,LIAN Kunzhou,et al.Study on the resource recycling and reuse treatment of desulfurization wastewater in power plant[J].Technology of Water Treatment,2017,43(6):41-44.
[17]周明飞,吴火强,王璟,等.燃煤电厂脱硫废水综合利用处理工艺实验研究[J].水处理技术,2017,43(10):103-109.ZHOU Mingfei,WU Huoqiang,WANG jing,et al.Experimental study on desulfurization wastewater comprehensive utilization treatment process in coal-fired power plant[J].Technology of Water Treatment,2017,43(10):103-109.
[18]奥斯曼·吐尔地,杨令,安迪,等.吹脱法处理氨氮废水的研究和应用进展[J].石油化工,2014,43(11):1348-1353.AOSIMAN Tuerdi,YANG Ling,AN Di,et al.Progresses in air stripping for treatment of ammonia wastewater[J].Petrochemical Technology,2014,43(11):1348-1353.
[19]毛燕芳.吹脱法处理高浓度氨氮医药废水试验及工程实例[J].上海水务,2017(1):19-22.MAO Yanfang.An treatment of high concentration ammonia nitrogen wastewater by blow off and the engineering project[J].Shanghai Water,2017(1):19-22.
[20]李明达,李桂生,施伟,等.用于氨氮废水处理的复合脱氮助剂:103553171A[P].2014-02-05.
[21]赵丽华,冯俊生,徐佩佩,等.磁化/超声吹脱处理高质量浓度氨氮废水试验研究[J].常州大学学报,2013,25(3):17-20.ZHAO Lihua,FENG Junsheng,XU Peipei.Research of treating high concentration ammonia nitrogen wastewater by magnetization and ultrasound stripping[J].Journal of Changzhou University,2013,25(3):17-20.