Direct contact membrane distillation with softening Pre-treatment for effective reclaiming flue gas desulfurization wastewater

Bang Li; Yanbin Yun; Guicheng Liu; Chunli Li; Xinyang Li; Muhammad Hilal; Woochul Yang; Manxiang Wang

doi:10.1016/j.seppur.2021.119637

Direct contact membrane distillation with softening Pre-treatment for effective reclaiming flue gas desulfurization wastewater

Bang Li
, Yanbin Yun
, Guicheng Liu
, Chunli Li
, Xinyang Li
, Muhammad Hilal
, Woochul Yang
, Manxiang Wang

Department of Physics

Research output: Contribution to journal › Article › peer-review

27 Scopus citations

Abstract

The flue gas desulfurization wastewater (FGDW) contains extremely high concentration of heavy ions (e.g., Ca²⁺, Mg²⁺) and unbiodegradable organic pollutants such as humic substances. In this paper, the effects of softening pre-treatment on water reclamation performance and membrane fouling phenomenon of the direct contact membrane distillation of FGDW were investigated systematically. Results showed that fouling on the membrane caused by crystallization of CaSO₄, Mg-Si complex, Al colloid, and organic matter in the FGDW decreased the permeate flux. Pre-treatment with NaCO₃, NaOH and polyacrylamide in combination with coagulation and chemical precipitation processes resulted in nearly 100% removal of Ca²⁺ and Mg²⁺ and prevented membrane from fouling. This led to 11 times-concentrated FGDW with excellent salt and organic matter rejections. Overall, membrane distillation combined with softening pre-treatment can effectively reclaim FGDW water with high concentration and salt rejection rates, without causing significant membrane fouling.

Original language	English
Article number	119637
Journal	Separation and Purification Technology
Volume	277
DOIs	https://doi.org/10.1016/j.seppur.2021.119637
State	Published - 15 Dec 2021

Keywords

Direct contact membrane distillation
Flue gas desulfurization wastewater
Membrane fouling
Softening pre-treatment
Water reclamation

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10.1016/j.seppur.2021.119637

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title = "Direct contact membrane distillation with softening Pre-treatment for effective reclaiming flue gas desulfurization wastewater",

abstract = "The flue gas desulfurization wastewater (FGDW) contains extremely high concentration of heavy ions (e.g., Ca2+, Mg2+) and unbiodegradable organic pollutants such as humic substances. In this paper, the effects of softening pre-treatment on water reclamation performance and membrane fouling phenomenon of the direct contact membrane distillation of FGDW were investigated systematically. Results showed that fouling on the membrane caused by crystallization of CaSO4, Mg-Si complex, Al colloid, and organic matter in the FGDW decreased the permeate flux. Pre-treatment with NaCO3, NaOH and polyacrylamide in combination with coagulation and chemical precipitation processes resulted in nearly 100\% removal of Ca2+ and Mg2+ and prevented membrane from fouling. This led to 11 times-concentrated FGDW with excellent salt and organic matter rejections. Overall, membrane distillation combined with softening pre-treatment can effectively reclaim FGDW water with high concentration and salt rejection rates, without causing significant membrane fouling.",

keywords = "Direct contact membrane distillation, Flue gas desulfurization wastewater, Membrane fouling, Softening pre-treatment, Water reclamation",

author = "Bang Li and Yanbin Yun and Guicheng Liu and Chunli Li and Xinyang Li and Muhammad Hilal and Woochul Yang and Manxiang Wang",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

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day = "15",

doi = "10.1016/j.seppur.2021.119637",

language = "English",

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T1 - Direct contact membrane distillation with softening Pre-treatment for effective reclaiming flue gas desulfurization wastewater

AU - Li, Bang

AU - Yun, Yanbin

AU - Liu, Guicheng

AU - Li, Chunli

AU - Li, Xinyang

AU - Hilal, Muhammad

AU - Yang, Woochul

AU - Wang, Manxiang

PY - 2021/12/15

Y1 - 2021/12/15

N2 - The flue gas desulfurization wastewater (FGDW) contains extremely high concentration of heavy ions (e.g., Ca2+, Mg2+) and unbiodegradable organic pollutants such as humic substances. In this paper, the effects of softening pre-treatment on water reclamation performance and membrane fouling phenomenon of the direct contact membrane distillation of FGDW were investigated systematically. Results showed that fouling on the membrane caused by crystallization of CaSO4, Mg-Si complex, Al colloid, and organic matter in the FGDW decreased the permeate flux. Pre-treatment with NaCO3, NaOH and polyacrylamide in combination with coagulation and chemical precipitation processes resulted in nearly 100% removal of Ca2+ and Mg2+ and prevented membrane from fouling. This led to 11 times-concentrated FGDW with excellent salt and organic matter rejections. Overall, membrane distillation combined with softening pre-treatment can effectively reclaim FGDW water with high concentration and salt rejection rates, without causing significant membrane fouling.

AB - The flue gas desulfurization wastewater (FGDW) contains extremely high concentration of heavy ions (e.g., Ca2+, Mg2+) and unbiodegradable organic pollutants such as humic substances. In this paper, the effects of softening pre-treatment on water reclamation performance and membrane fouling phenomenon of the direct contact membrane distillation of FGDW were investigated systematically. Results showed that fouling on the membrane caused by crystallization of CaSO4, Mg-Si complex, Al colloid, and organic matter in the FGDW decreased the permeate flux. Pre-treatment with NaCO3, NaOH and polyacrylamide in combination with coagulation and chemical precipitation processes resulted in nearly 100% removal of Ca2+ and Mg2+ and prevented membrane from fouling. This led to 11 times-concentrated FGDW with excellent salt and organic matter rejections. Overall, membrane distillation combined with softening pre-treatment can effectively reclaim FGDW water with high concentration and salt rejection rates, without causing significant membrane fouling.

KW - Direct contact membrane distillation

KW - Flue gas desulfurization wastewater

KW - Membrane fouling

KW - Softening pre-treatment

KW - Water reclamation

UR - https://www.scopus.com/pages/publications/85114428768

U2 - 10.1016/j.seppur.2021.119637

DO - 10.1016/j.seppur.2021.119637

M3 - Article

AN - SCOPUS:85114428768

SN - 1383-5866

VL - 277

JO - Separation and Purification Technology

JF - Separation and Purification Technology

M1 - 119637

ER -

Direct contact membrane distillation with softening Pre-treatment for effective reclaiming flue gas desulfurization wastewater

Abstract

Keywords

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