HCA强化混凝预处理生活污水的效能及机理
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摘要
通过单因素及正交试验,以聚二甲基二烯丙基氯化铵(HCA)为混凝剂对模拟农村生活污水进行强化混凝预处理,考察了影响HCA混凝去除SS、TP及有机物的主要因素及其主次顺序,并以Zeta电位及分形维数对HCA的混凝机理进行了分析.结果表明,影响HCA处理效果的因素顺序为初始pH值值>HCA投加量>絮凝搅拌时间>混合搅拌速度梯度>混合搅拌时间>絮凝搅拌速度梯度,在优化条件下HCA混凝对SS、TP及COD去除率最高分别达94.1%、74.9%及61.1%;当HCA投加量为15mg/L时,Zeta电位与絮体分形维数分别为-2.03mv及1.0149.试验表明HCA对生活污水具有较好的处理效果,强化混凝去除污染物的机理主要是电性中和作用.
The single factor and orthogonal experiments were carried out to enhance coagulation pretreatment of simulation of rural domestic sewage used by Poly Dimethyl Diallyl Propy Ammoniuml Chloride(HCA) as a coagulant,meanwhile the removal sequence of HCA and main factors were also analyzed on the removal effect of SS,TP and organic matter by HCA.Meanwhile the coagulation mechanism of HCA was analyzed through the Zeta potential and fractal dimension.The results showed that the influence factors of HCA treatment effect was in as a order of the initial pH value >HCA dosage>flocculation stirring time >mixed speed gradient>blend stirring time >flocculation stirring speed gradient,and under the optimized conditions,SS,TP and COD removal rates were up to 94.1%,74.9% and 61.1%,respectively;when the dosage of HCA was 15 mg/L,Zeta potential and the fractal dimension of flocs was-2.03 mv and 1.0149,respectively.The analysis of the experimental results showed that the HCA of sewage treatment had obvious effect and its mechanism was mainly charge neutralization.
The single factor and orthogonal experiments were carried out to enhance coagulation pretreatment of simulation of rural domestic sewage used by Poly Dimethyl Diallyl Propy Ammoniuml Chloride(HCA) as a coagulant,meanwhile the removal sequence of HCA and main factors were also analyzed on the removal effect of SS,TP and organic matter by HCA.Meanwhile the coagulation mechanism of HCA was analyzed through the Zeta potential and fractal dimension.The results showed that the influence factors of HCA treatment effect was in as a order of the initial pH value >HCA dosage>flocculation stirring time >mixed speed gradient>blend stirring time >flocculation stirring speed gradient,and under the optimized conditions,SS,TP and COD removal rates were up to 94.1%,74.9% and 61.1%,respectively;when the dosage of HCA was 15 mg/L,Zeta potential and the fractal dimension of flocs was-2.03 mv and 1.0149,respectively.The analysis of the experimental results showed that the HCA of sewage treatment had obvious effect and its mechanism was mainly charge neutralization.
引文
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[16]Liu B T,Hai Y C,Yong C.Study of Flocs MorpHology of Chitosan Coagulation Aid Treatment and Fractal Dimensions[J].Advanced Materials Research,2011,1332(282):56-63.
[2]王建芳,沈耀,宋小康.改进型厌氧折流板反应器预处理农村生活污水效能研究[J].水处理技术,2012,38(8):69-72.
[3]刘海龙,任宇霞,张忠民.低温污水前置强化混凝[J].环境科学,2018,39(5):2239-2248.
[4]Li X X,Yue J,Zhang X L,et al.The characteristics of sludge from enhanced coagulation processes using PAC/PDM DAAC composite coagulants in treatment of micro-polluted raw water[J].Separation and Purification Technology,2015,147:125-131.
[5]贺建栋,刘鹏宇,常青,等.PAC与PDMDAAC复合混凝剂去除高浊度水中有机氯[J].中国环境科学,2016,36(6):1738-1745.
[6]Haijiao Fu,Dazhen Tang,Ting Xu,Hao Xu,et al.Characteristics of pore structure and fractal dimension of lowrank coal:A case study of Lower Jurassic Xishanyao coal in the southern Junggar Basin,NWChina[J].Fuel,2017,(193):254-264.
[7]石颖,马军,李圭白.pH值对高铁酸盐复合药剂强化除藻的影响[J].中国给水排水,2000,16(1):18-20.
[8]宋欣欣.水中絮体颗粒动态分布特征对絮凝效果影响研究[D].哈尔滨:哈尔滨工业大学,2009.
[9]付英,于水利,暴瑞玲.聚硅酸铁(PSF)混凝剂搅拌动力学的特性及理论分析[J].水处理技术,2006,32(11):16-20.
[10]杨艳玲,李星,聂学峰,等.给水处理强化混凝除磷技术研究[J].北京工业大学学报,2006,32(10):939-943.
[11]LiaoB Q,AllenD G,Droppo I G.Surface properties of sludge and their role in bioflocculation and settleability[J].Water Research,2001,35(2):339-350.
[12]王浩宇,苏本生,黄丹,等.好氧污泥颗粒化过程中Zeta电位与EPS的变化特性[J].环境科学,2012,33(5):1614-1620.
[13]蒋绍阶,蒋晖,向平,等.强化混凝去除尖针杆藻[J].环境工程学报,2013,7(9):3312-3318.
[14]Henderson R K,Parsons S A,Jefferson B.Successful removal of algae throughthe controlof Zeta potential[J].Separati-on Science and Technology,2008,43(7):1653-1666.
[15]李振亮,张代钧,卢培利,等.活性污泥絮体粒径分布与分形维数的影响因素[J].环境科学,2013,34(10):3975-3980.
[16]Liu B T,Hai Y C,Yong C.Study of Flocs MorpHology of Chitosan Coagulation Aid Treatment and Fractal Dimensions[J].Advanced Materials Research,2011,1332(282):56-63.