Effect of potassium permanganate dosing position on the performance of coagulation/ultrafiltration combined process

doi:10.1016/j.cjche.2017.03.037

Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (1): 89-95.DOI: 10.1016/j.cjche.2017.03.037

• Separation Science and Engineering • Previous Articles Next Articles

Effect of potassium permanganate dosing position on the performance of coagulation/ultrafiltration combined process

He Zhao^1,3, Liang Wang², Hongwei Zhang^1,2, Xiaona Wu¹, Bin Zhao², Fei Han³

1 School of Environmental Science and Technology, Tianjin University, Tianjin 300072, China;
2 State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China;
3 School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China

Received:2017-01-06 Revised:2017-03-24 Online:2018-03-01 Published:2018-01-28
Contact: Liang Wang,E-mail address:mashi7822@163.com
Supported by:
Supported by the National Natural Science Foundation of China (51478314, 51638011), the National Key Project for Research and Development Program of China (2016YFC0400503), the Natural Science Foundation of Tianjin (14JCQNJC09000), and Science and Technology Research Projects of Colleges and Universities of Hebei Province (QN2015122).

Effect of potassium permanganate dosing position on the performance of coagulation/ultrafiltration combined process

He Zhao^1,3, Liang Wang², Hongwei Zhang^1,2, Xiaona Wu¹, Bin Zhao², Fei Han³

1 School of Environmental Science and Technology, Tianjin University, Tianjin 300072, China;
2 State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, Tianjin 300387, China;
3 School of Civil Engineering and Transportation, Hebei University of Technology, Tianjin 300401, China

通讯作者: Liang Wang,E-mail address:mashi7822@163.com
基金资助:
Supported by the National Natural Science Foundation of China (51478314, 51638011), the National Key Project for Research and Development Program of China (2016YFC0400503), the Natural Science Foundation of Tianjin (14JCQNJC09000), and Science and Technology Research Projects of Colleges and Universities of Hebei Province (QN2015122).

Abstract

Abstract: The effects of potassium permanganate (KMnO₄) dosing position on the natural organic matter (NOM) removal as well as membrane fouling were investigated in the coagulation/ultrafiltration combined process. KMnO₄ oxidation altered the NOM characteristics in terms of hydrophobicity and molecular weight, and destroyed humic substances originated from terraneous organisms in raw water. The optimal KMnO₄ dosage was 0.5 mg·L^-1 in the peroxidation enhanced coagulation process with respect to the dissolved organic carbon (DOC) removal. When KMnO₄ was dosed into both upstream and downstream of coagulation, namely in the proposed twoposition dosing mode, coagulation and KMnO₄ oxidation worked individually on the apparent DOC removal. However, compared to the KMnO₄ addition prior to or after coagulation, the two-position dosing mode dramatically alleviated membrane fouling and reduced fouling irreversibility. This was attributed to the change of NOM characteristics as a result of KMnO₄ addition prior to coagulation and the presence of MnO₂ on membrane surface as a result of KMnO₄ addition prior to ultrafiltration. This work may provide useful information for the application of KMnO₄ oxidation in the coagulation/ultrafiltration combined system.

Key words: Potassium permanganate, Coagulation, Dosing position, Ultrafiltration, Fouling

摘要： The effects of potassium permanganate (KMnO₄) dosing position on the natural organic matter (NOM) removal as well as membrane fouling were investigated in the coagulation/ultrafiltration combined process. KMnO₄ oxidation altered the NOM characteristics in terms of hydrophobicity and molecular weight, and destroyed humic substances originated from terraneous organisms in raw water. The optimal KMnO₄ dosage was 0.5 mg·L^-1 in the peroxidation enhanced coagulation process with respect to the dissolved organic carbon (DOC) removal. When KMnO₄ was dosed into both upstream and downstream of coagulation, namely in the proposed twoposition dosing mode, coagulation and KMnO₄ oxidation worked individually on the apparent DOC removal. However, compared to the KMnO₄ addition prior to or after coagulation, the two-position dosing mode dramatically alleviated membrane fouling and reduced fouling irreversibility. This was attributed to the change of NOM characteristics as a result of KMnO₄ addition prior to coagulation and the presence of MnO₂ on membrane surface as a result of KMnO₄ addition prior to ultrafiltration. This work may provide useful information for the application of KMnO₄ oxidation in the coagulation/ultrafiltration combined system.

关键词: Potassium permanganate, Coagulation, Dosing position, Ultrafiltration, Fouling

He Zhao, Liang Wang, Hongwei Zhang, Xiaona Wu, Bin Zhao, Fei Han. Effect of potassium permanganate dosing position on the performance of coagulation/ultrafiltration combined process[J]. Chin.J.Chem.Eng., 2018, 26(1): 89-95.

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Effect of potassium permanganate dosing position on the performance of coagulation/ultrafiltration combined process

Effect of potassium permanganate dosing position on the performance of coagulation/ultrafiltration combined process

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