深水循环加压混凝沉淀除藻工艺研究
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摘要
为提高水中蓝藻的混凝沉淀去除效果,采用深水循环井对水体进行预处理,使蓝藻气囊在深水压力作用下破裂,藻体失去气囊浮力,再经后续混凝沉淀去除。静态试验表明,随深水循环井深度的加大,混凝沉淀后各项出水指标浓度降低;当循环井深度为80 m、混凝剂[Al_2(SO_4)_3·18H_2O]投加量为30 mg/L时,对叶绿素a、COD_(Mn)和DOC的去除率分别为95.5%、62.1%和39%,出水浊度为1.35 NTU,较2 mg/L的NaClO预氧化混凝沉淀出水效果好且供水水质安全。动态试验进一步表明,深水循环混凝沉淀工艺对去除蓝藻是有效的,特别是对微囊蓝藻的去除尤为明显。
In order to increase the removal efficiency of cyanobacteria by coagulation and sedimentation,the cyanobacteria-containing water was pretreated with the deep water circulation well.Under the pressure of the deep water,the gas vesicles of cyanobacteria were broken and the cyanobacterial cells lost buoyancy,which promoted the removal of cyanobacteria by coagulation and sedimentation.Static experimental results showed that with the increase of well depth,the effluent indices after coagulation and sedimentation decreased correspondingly.When the depth of the deep water circulation treatment was 80 m,and the Al_2(SO_4)_3·18H_2O dose was 30 mg/L,the removal rates of chlorophyll-a,CODMnand DOC were 95.5%,62.1% and 39%,respectively,and the effluent turbidity was 1.35 NTU,which indicated better and safe treatment effect compared with that by preoxidation(2 mg/L NaClO)/coagulation and sedimentation process.Dynamic experiments further indicated that the deep water circulation/coagulation and sedimentation process is effective for the removal of cyanobacteria,especially for the removal of Microcystis.
In order to increase the removal efficiency of cyanobacteria by coagulation and sedimentation,the cyanobacteria-containing water was pretreated with the deep water circulation well.Under the pressure of the deep water,the gas vesicles of cyanobacteria were broken and the cyanobacterial cells lost buoyancy,which promoted the removal of cyanobacteria by coagulation and sedimentation.Static experimental results showed that with the increase of well depth,the effluent indices after coagulation and sedimentation decreased correspondingly.When the depth of the deep water circulation treatment was 80 m,and the Al_2(SO_4)_3·18H_2O dose was 30 mg/L,the removal rates of chlorophyll-a,CODMnand DOC were 95.5%,62.1% and 39%,respectively,and the effluent turbidity was 1.35 NTU,which indicated better and safe treatment effect compared with that by preoxidation(2 mg/L NaClO)/coagulation and sedimentation process.Dynamic experiments further indicated that the deep water circulation/coagulation and sedimentation process is effective for the removal of cyanobacteria,especially for the removal of Microcystis.
引文
[1]黄廷林,丛海兵,柴蓓蓓.饮用水水源水质污染控制[M].北京:中国建筑工业出版社,2009.
[2]丛海兵,黄廷林,周真明.于桥水库铜绿微囊藻上浮运动规律及其控制[J].给水排水,2009,35(11):140-145.
[3]孔繁翔,宋立荣.蓝藻水华形成过程及其环境特征研究[M].北京:科学出版社,2011.
[4]李柱,高乃云,王海亮,等.藻类对净水工艺的影响及应对措施[J].中国给水排水,2015,31(14):116-118.
[5]赵宗宇,文刚,黄廷林.预氧化含蓝藻水过程中AOC变化规律及作用机理[J].中国给水排水,2016,32(3):46-51.
[6]黎雷,高乃云,殷娣娣,等.控制饮用水源水中藻类、藻毒素的水厂处理工艺[J].中国给水排水,2008,24(6):20-24.
[7]谢鹏超,岳思阳,邹景,等.四种预氧化方式对AOC及消毒副产物影响的对比[J].中国给水排水,2015,31(7):6-9.
[8]储昭升,杨波,金相灿,等.6株蓝藻伪空胞的临界破裂压力研究[J].环境科学,2007,28(12):2695-2699.
[9]代然,储昭升,于秀娟,等.压力下伪空胞破裂对3种水华蓝藻生长及光合作用的影响[J].环境科学研究,2012,25(1):30-35.
[10]丛海兵,黄廷林.深水循环强化混凝沉淀除藻水处理系统和方法[P].中国专利:CN201210109541.9,2013-06-26.
[11]丛海兵,陈雯婧,徐亚军,等.压力强化混凝沉淀除藻工艺研究[J].环境科学学报,2013,33(7):1-6.
[2]丛海兵,黄廷林,周真明.于桥水库铜绿微囊藻上浮运动规律及其控制[J].给水排水,2009,35(11):140-145.
[3]孔繁翔,宋立荣.蓝藻水华形成过程及其环境特征研究[M].北京:科学出版社,2011.
[4]李柱,高乃云,王海亮,等.藻类对净水工艺的影响及应对措施[J].中国给水排水,2015,31(14):116-118.
[5]赵宗宇,文刚,黄廷林.预氧化含蓝藻水过程中AOC变化规律及作用机理[J].中国给水排水,2016,32(3):46-51.
[6]黎雷,高乃云,殷娣娣,等.控制饮用水源水中藻类、藻毒素的水厂处理工艺[J].中国给水排水,2008,24(6):20-24.
[7]谢鹏超,岳思阳,邹景,等.四种预氧化方式对AOC及消毒副产物影响的对比[J].中国给水排水,2015,31(7):6-9.
[8]储昭升,杨波,金相灿,等.6株蓝藻伪空胞的临界破裂压力研究[J].环境科学,2007,28(12):2695-2699.
[9]代然,储昭升,于秀娟,等.压力下伪空胞破裂对3种水华蓝藻生长及光合作用的影响[J].环境科学研究,2012,25(1):30-35.
[10]丛海兵,黄廷林.深水循环强化混凝沉淀除藻水处理系统和方法[P].中国专利:CN201210109541.9,2013-06-26.
[11]丛海兵,陈雯婧,徐亚军,等.压力强化混凝沉淀除藻工艺研究[J].环境科学学报,2013,33(7):1-6.