电絮凝-高效澄清池联合技术在循环水排污水处理中的应用
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摘要
为减轻高分子絮凝剂、助凝剂对膜处理系统的污堵,强化循环水排污水混凝澄清效果,北方某热电厂采用了电絮凝-高效澄清池联用技术对其循环水排污水进行预处理。通过系统调试,考察了不同电流密度、凝聚池pH值及碳酸钠加药量下,澄清池出水浊度、总硬度及总碱度的变化情况。结果表明,在电流密度为5.96 A/m2,凝聚池pH值约为11.0,碳酸钠加药量为170 mg/L时,电絮凝-高效澄清池对浊度、总硬度和总碱度去除率分别约为90%、60%和66%,平均出水浊度为0.9 NTU,总硬度为9.7 mmol/L,总碱度为1.2 mmol/L,出水水质稳定,满足后续膜处理工艺进水水质要求,并降低了后续膜系统污堵的风险。
To alleviate the fouling of the flocculant and polymer coagulant on the membrane treatment system and strengthen the clarification and coagulation effect in treatment of the circulating water drainage, a thermal power plant in northern China adopted the electrocoagulation-efficient clarifying basin combined technology to pretreat the circulating waste water. Through the system commissioning, the changes of the effluent turbidity, total hardness and total alkalinity of the clarifier were investigated under conditions with different current densities, pH values of the pool and sodium carbonate dosages. The results show that, under condition with current density of5.96 A/m2, pH value of 11.0, and the sodium carbonate dosage of 170 mg/L in the electroflocculation-efficient clarifying basin system, the turbidity, total hardness and total alkalinity removal rates were approximately 90%,60% and 66%, the average effluent turbidity, total hardness and total alkalinity were 0.9 NTU, 9.7 mmol/L and1.2 mmol/L, respectively. The effluent water quality was stable, which satisfied the requirements for subsequent membrane treatment process, and reduced the risk of fouling of the membrane system.
To alleviate the fouling of the flocculant and polymer coagulant on the membrane treatment system and strengthen the clarification and coagulation effect in treatment of the circulating water drainage, a thermal power plant in northern China adopted the electrocoagulation-efficient clarifying basin combined technology to pretreat the circulating waste water. Through the system commissioning, the changes of the effluent turbidity, total hardness and total alkalinity of the clarifier were investigated under conditions with different current densities, pH values of the pool and sodium carbonate dosages. The results show that, under condition with current density of5.96 A/m2, pH value of 11.0, and the sodium carbonate dosage of 170 mg/L in the electroflocculation-efficient clarifying basin system, the turbidity, total hardness and total alkalinity removal rates were approximately 90%,60% and 66%, the average effluent turbidity, total hardness and total alkalinity were 0.9 NTU, 9.7 mmol/L and1.2 mmol/L, respectively. The effluent water quality was stable, which satisfied the requirements for subsequent membrane treatment process, and reduced the risk of fouling of the membrane system.
引文
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[2]李亚娟,陈景硕,余耀宏,等.高回收率循环水排污水回用处理工艺研究[J].工业安全与环保,2016,42(9):15-18.LI Yajuan,CHEN Jingshuo,YU Yaohong,et al.High recovery rate of recycling treatment technology research of circulating waste water[J].Industrial Safety and Environment Protection,2016,42(9):15-18.
[3]张江涛,董娟.火力发电厂循环排污水处理回用技术的比较分析[J].水处理技术,2012,38(8):124-127.ZHANG Jiangtao,DONG Juan.Compare and analysis of recycling utilization technology of blow-down water from circulating water of fossil-fired power plant[J].Technology of Water Treatment,2012,38(8):124-127.
[4]李亚娟,申建汛,武忠全,等.火电厂循环水排污水纳滤处理试验[J].热力发电,2016,45(12):137-142.LI Yajuan,SHEN Jianxun,WU Zhongquan,et al.Experimental study on circulating water treatment in coal-fired power plants using Nanofiltration process[J].Thermal Power Generation,2016,45(12):137-142.
[5]陈颖敏,孙心利,吴静然.循环水排污水回用中磷系阻垢剂对混凝效果的影响及措施[J].热力发电,2010,39(1):95-99.CHEN Yingmin,SUN Xinli,WU Jingran.Influence of phosphorous antiscalant used in recycling utilization system of blow-down water from circulating water upon the coagulation effect[J].Thermal Power Generation,2010,39(1):95-99.
[6]张鑫,吴海峰,陈颖敏.循环水处理系统中反渗透膜的污染及清洗[J].电力科学与工程,2013,29(9):74-78.ZHANG Xin,WU Haifeng,CHEN Yingmin.Pollution and cleaning of reverse osmosis membrane in circulating water treatment system[J].Electric Power Science and Engineering,2013,29(9):74-78.
[7]杨宝红,余耀宏.火电厂循环水排污水回用处理中超滤膜污染过程分析[J].电力科学与技术学报,2007(4):79-83.YANG Baohong,YU Yaohong.Ultrafiltration membrane fouling process analysis for reuse the blowdown water in thermal power plant[J].Electric Power Science and Technology,2007(4):79-83.
[8]叶治安,袁国全,许臻,等.慢速脱碳水处理工艺在火电厂节水中的应用[J].热力发电,2011,40(7):78-80.YE Zhi’an,YUAN Guoquan,XU Zhen,et al.Application of slow speed decarbonization water treatment process in aspect of water-saving within thermal power plant[J].Environmental Science,2011,40(7):78-80.
[9]赵凯,杨春风,孙境求,等.超滤的预处理工艺对比研究:化学混凝与电絮凝[J].环境科学,2016,37(12):4706-4711.ZHAO Kai,YANG Chunfeng,SUN Jingqiu,et al.Comparative study on pretreatment process of ultrafiltration:chemical coagulation and electrocoagulation[J].Environmental Science,2016,37(12):4706-4711.
[10]IZQUIERDO C J,CANIZARES P,RODRIGO M A,et al.Effect of the nature of the supporting electrolyte on the treatment of soluble oils by electrocoagulation[J].Desalination,2010,255(1):15-20.
[11]刘永,杜建伟,陈思莉,等.复合铝铁絮凝剂对印染废水的预处理研究[J].工业水处理,2013,33(12):25-28.LIU Yong,DU Jianwei,CHEN Sili,et al.Study on the pretreatment of printing&dyeing wastewater with composite polyaluminum ferric flocculants[J].Industrial Water Treatment,2013,33(12):25-28.
[12]LAKSHMANAN D,CLIFFORD D A,SAMANTA G.Ferrous and ferric ion generation during iron electrocoagulation[J].Environmental Science&Technology,2009,43(10):3853.
[13]王锐.电絮凝-石灰沉淀处理高浓度磷酸盐废水的工艺研究[D].哈尔滨:哈尔滨工业大学,2017:15-17.WANG Rui.Treatment of high concentration phosphate wastewater by electrocoagulation-lime precipitation[D].Harbin:Harbin Institute of Technology,2017:15-17.
[14]张广远.HERO工艺在煤化工废水处理与回用中的应用[J].工业水处理,2016,36(12):112-114.ZHANG Guangyuan.Application of HERO technology to the treatment of wastewater from coal chemical industry and its reuse[J].Industrial Water Treatment,2016,36(12):112-114.
[15]杨运平,李锐,刘秀娟,等.火电厂石灰软化水质混凝澄清工艺对比分析[J].环境工程,2014,32(增刊1):192-194.YANG Yunping,LI Rui,LIU Xiujuan,et al.Comparative analysis of coagulation and clarification techniques in lime softening technique for treating cooling water in power plants[J].Environmental Engineering,2014,32(Suppl.1):192-194.
[16]张雨山,王树勋,王静,等.电絮凝净化海水过程中电流效率和总磷去除率的研究[J].工业水处理,2010,30(12):52-55.ZHANG Yushan,WANG Shuxun,WANG Jing,et al.Study on current efficiency and total phosphorus removal rate during seawater electrocoagulation process[J].Industrial Water Treatment,2010,30(12):52-55.