Study on Desulfurization Wastewater Treatment for the Power Plant with Seawater Cooling System

doi:10.11930/j.issn.1004-9649.201708223

Abstract

Abstract: All industrial wastewater has been treated and reused at one coal-fired power plant with once-through cooling system except the desulphurization wastewater. In order to achieve the goal of zero discharge of wastewater, the desulfurization wastewater treatment is studied in this paper with the technique consisting of microfiltration (MF), reverse osmosis (RO), and electro-dialysis (ED) processes. The results show that at the RO recovery rate of 75%, the desalination rate is over 99% and the removal rates is over 90% for Ca²⁺, Mg²⁺, SO₄^2– and other divalent ions. After being concentrated by ED, the salt content increased from 7% to 21%. Ultimately, the effluent volume decreased from 20 m³/h to 2 m³/h, which could significantly reduce the cost of crystallization equipment and energy consumption. After the implementation of this plan, the utilization factor of water resource could be improved and the target of zero discharge of wastewater will be achieved.

Key words: coal fired power plant, seawater once-through cooling, desulfurization wastewater, concentration and reduction, microfiltration, reverse osmosis, electrodialysis, zero discharge of waste water

CLC Number:

X773
TM621.9

LU Jian, LI Yajuan, XU Zhen, HU Dalong, JIANG Xiaoyan. Study on Desulfurization Wastewater Treatment for the Power Plant with Seawater Cooling System[J]. Electric Power, 2018, 51(11): 179-184.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201708223

https://www.electricpower.com.cn/EN/Y2018/V51/I11/179

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