Strengthen of coagulation for light pollution water with low turbidity by recycling of backwash water from filter

doi:10.3969/j.issn.0438-1157.2013.05.043

CIESC Journal ›› 2013, Vol. 64 ›› Issue (5): 1819-1824.DOI: 10.3969/j.issn.0438-1157.2013.05.043

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Strengthen of coagulation for light pollution water with low turbidity by recycling of backwash water from filter

XIE Si, YANG Yanling, LI Xing, ZHOU Zhiwei, SU Zhaoyang, LI Bo, LIU Ling

College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China

Received:2012-08-03 Revised:2012-09-04 Online:2013-05-05 Published:2013-05-05
Supported by:
supported by the National Natural Science Foundation of China(51278005),Water Pollution Control and Management Technology Major Projects(2009ZX07424-005-01).

滤池反冲洗水回流强化混凝低浊微污染水特性

谢斯, 杨艳玲, 李星, 周志伟, 苏兆阳, 李波, 刘玲

北京工业大学建筑工程学院, 北京 100124

通讯作者: 杨艳玲
作者简介:谢斯(1986-),男,硕士研究生。
基金资助:
国家自然科学基金项目(51278005);水体污染控制与治理科技重大专项(2009ZX07424-005-01);北京工业大学研究生科技基金。

Abstract

Abstract: This study focuses on distribution of light pollution water with low turbidity, by adjusting dosage of polyaluminum chloride(PACI)to control floc zeta potential.Influence of backwash water(FBWW)with different coagulation characteristics from filter on coagulation efficiency was also investigated.The results show that FBWW is of good efficiency on turbidity removal as zeta potential close to -11 mV.The maximum removal rate for settled water was 63.81%, and it was higher than that at other potentials by using this processing.And the lowest residual Al_P content was found about 0.271 mg稬^-1 at this potential.However, excessive backflow(12%)can lead to additional consumption of PACl in this stage, which makes particle matter in raw water to obtain sufficient coagulant difficult and the system to lose stabilization, and so, turbidity, COD_Mn, Al_P, Al_D, etc.goes up.When zeta potential is close to 0 mV, the FBWW is also of good effect on COD_Mn, UV₂₅₄ and Al_P,and Al_D can stay in a relative low value as well. If reflux ratio is 9%, the removal rate of COD_Mn can reach the highest test value, about 34.21%.When zeta potential is placed at close to +4 mV, the reflux of FBWW can cause substantial increase of turbidity, COD_Mn, Al_P and Al_D, while removal efficiency for UV₂₄₅ is improved.This trend was most obvious for the backflow ratio about 12%, at which the highest test value of UV₂₅₄(60.67%)is obtained.By comparing residual organic matters in filtered and settled water, a significant difference between these organic matters is found.The removal rates of UV₂₅₄ and COD_Mn were higher for the filtered water at +4 mV.

Key words: low turbidity, filter backwash water, organic matter, residual aluminum

摘要： 以低浊微污染配水为研究对象,通过调整PACl投药量来控制絮体Zeta电位,考察不同混凝特性下滤池反冲洗水(FBWW)回流对混凝效能的影响。结果表明:Zeta电位接近-11 mV时,FBWW回流对浊度具有良好的去除效果,沉后水浊度最大去除率为63.81%,高于其他电位下FBWW回流处理效果,沉后水中残余Al_P含量最低(0.271 mg·L^-1)。但此阶段下过高的回流(12%)会导致水中PACl的额外消耗,使原水颗粒物难以获得足够的混凝剂而脱稳,致使浊度、COD_Mn、Al_P、Al_D等上升。Zeta电位接近0 mV时,FBWW对浊度、COD_Mn、UV₂₅₄、Al_P均有良好的处理效果,Al_D同时也能保持相对较低的值。当回流比在9%时,沉后水COD_Mn去除率达试验最高值34.21%。Zeta电位接近+4 mV时,FBWW回流导致浊度、COD_Mn、Al_P、Al_D大幅上升,而 UV₂₅₄去除率得到提高。回流比为12%时,这种趋势最为明显,UV₂₅₄去除率达试验最高值60.67%。通过对砂后水与沉后水有机物残余进行研究对比,沉后水与砂后水有机物的去除效果存在明显差异性,+4 mV下UV₂₅₄、COD_Mn去除率均高于其他电位。

关键词: 低浊, 滤池反冲洗水, 有机物, 残余铝

CLC Number:

TU991.2

XIE Si, YANG Yanling, LI Xing, ZHOU Zhiwei, SU Zhaoyang, LI Bo, LIU Ling. Strengthen of coagulation for light pollution water with low turbidity by recycling of backwash water from filter[J]. CIESC Journal, 2013, 64(5): 1819-1824.

谢斯, 杨艳玲, 李星, 周志伟, 苏兆阳, 李波, 刘玲. 滤池反冲洗水回流强化混凝低浊微污染水特性[J]. 化工学报, 2013, 64(5): 1819-1824.

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Strengthen of coagulation for light pollution water with low turbidity by recycling of backwash water from filter

滤池反冲洗水回流强化混凝低浊微污染水特性

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