Coagulation behavior of polyaluminum chloride: Effects of pH and coagulant dosage

doi:10.1016/j.cjche.2015.02.003

Chinese Journal of Chemical Engineering ›› 2015, Vol. 23 ›› Issue (6): 1041-1046.DOI: 10.1016/j.cjche.2015.02.003

• 能源、资源与环境技术 • 上一篇下一篇

Coagulation behavior of polyaluminum chloride: Effects of pH and coagulant dosage

Ning Wei^1,2, Zhongguo Zhang², Dan Liu², YueWu², JunWang³, Qunhui Wang ¹

1 Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2 Environment Protection Research Institute of Light Industry, Beijing Academy of Science and Technology, Beijing 100089, China;
3 State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

收稿日期:2014-09-01 修回日期:2015-02-18 出版日期:2015-06-28 发布日期:2015-07-09
通讯作者: Zhongguo Zhang
基金资助:
Supported by the Special Funds of Technological Development for Scientific Research Institutes from the Ministry of Science and Technology of China (2010EG111022, 2011EG111307, 2012EG111122), the Program for Overseas Talents (OTP-2013-015) and the Program for Innovative Research Team (IG201204N) from Beijing Academy of Science and Technology.

Coagulation behavior of polyaluminum chloride: Effects of pH and coagulant dosage

Ning Wei^1,2, Zhongguo Zhang², Dan Liu², YueWu², JunWang³, Qunhui Wang ¹

1 Department of Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2 Environment Protection Research Institute of Light Industry, Beijing Academy of Science and Technology, Beijing 100089, China;
3 State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China

Received:2014-09-01 Revised:2015-02-18 Online:2015-06-28 Published:2015-07-09
Contact: Zhongguo Zhang
Supported by:
Supported by the Special Funds of Technological Development for Scientific Research Institutes from the Ministry of Science and Technology of China (2010EG111022, 2011EG111307, 2012EG111122), the Program for Overseas Talents (OTP-2013-015) and the Program for Innovative Research Team (IG201204N) from Beijing Academy of Science and Technology.

摘要/Abstract

摘要： Coagulationmechanisms of polyaluminumchloride (PACl) at various dosageswere studied using a conventional jar test at different final and initial pH values during treating kaolin suspension. The optimal final pH and dosages for PACl were obtained based on residual turbidity and zeta potential of flocs. The coagulation zones at various PACl dosages and solution pH values were developed and compared with those of alum. It is found that the optimal mechanism under acidic condition is charge neutralization, while alkaline condition will facilitate the coagulation of PACl. Both charge neutralization coagulation and sweep coagulation can achieve high coagulation efficiency under the alkaline condition ranging from final pH 7.0 to 10.0. Stabilization, charge neutralization destabilization, restabilization and sweep zones occur successively with increasing PACl dosages with the final pH values fixed at 7.0 and 8.0, but restabilization zone disappears at final pH 10.0. When the final pH is not controlled and consequently decreases with increasing PACl dosage, no typical sweep zone can be observed and the coagulant efficiency decreases at high PACl dosage. It seems that the final pH is more meaningful than the initial pH for coagulation. Charge neutralization coagulation efficiency is dominated by zeta potential of flocs and PACl precipitates. The charge neutralization and sweep coagulation zones of PACl are broader in the ranges of coagulant dosage and pH than those of alum. The results are helpful for us to treat water andwastewater using PACl and to understand the coagulation process of PACl.

关键词: Separation, Coagulation, Aggregation, Precipitation, Charge neutralization, Sweep flocculation, Polyaluminum chloride

Abstract: Coagulationmechanisms of polyaluminumchloride (PACl) at various dosageswere studied using a conventional jar test at different final and initial pH values during treating kaolin suspension. The optimal final pH and dosages for PACl were obtained based on residual turbidity and zeta potential of flocs. The coagulation zones at various PACl dosages and solution pH values were developed and compared with those of alum. It is found that the optimal mechanism under acidic condition is charge neutralization, while alkaline condition will facilitate the coagulation of PACl. Both charge neutralization coagulation and sweep coagulation can achieve high coagulation efficiency under the alkaline condition ranging from final pH 7.0 to 10.0. Stabilization, charge neutralization destabilization, restabilization and sweep zones occur successively with increasing PACl dosages with the final pH values fixed at 7.0 and 8.0, but restabilization zone disappears at final pH 10.0. When the final pH is not controlled and consequently decreases with increasing PACl dosage, no typical sweep zone can be observed and the coagulant efficiency decreases at high PACl dosage. It seems that the final pH is more meaningful than the initial pH for coagulation. Charge neutralization coagulation efficiency is dominated by zeta potential of flocs and PACl precipitates. The charge neutralization and sweep coagulation zones of PACl are broader in the ranges of coagulant dosage and pH than those of alum. The results are helpful for us to treat water andwastewater using PACl and to understand the coagulation process of PACl.

Key words: Separation, Coagulation, Aggregation, Precipitation, Charge neutralization, Sweep flocculation, Polyaluminum chloride

Ning Wei, Zhongguo Zhang, Dan Liu, YueWu, JunWang, Qunhui Wang . Coagulation behavior of polyaluminum chloride: Effects of pH and coagulant dosage[J]. Chinese Journal of Chemical Engineering, 2015, 23(6): 1041-1046.

Ning Wei, Zhongguo Zhang, Dan Liu, YueWu, JunWang, Qunhui Wang . Coagulation behavior of polyaluminum chloride: Effects of pH and coagulant dosage[J]. Chin.J.Chem.Eng., 2015, 23(6): 1041-1046.

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Coagulation behavior of polyaluminum chloride: Effects of pH and coagulant dosage

Coagulation behavior of polyaluminum chloride: Effects of pH and coagulant dosage

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