Pilot-scale study on seeded precipitation assisted nanofiltration for flue-gas desulfurization wastewater softening

Author:

Duan Yawei1,Zhong Zhencheng12,Tong Zhenwei1,Cheng Zihong1,Xiong Rihua12

Affiliation:

1. National Institute of Clean-and-Low-Carbon Energy, Chuanghua Road, Changping district, Beijing 102211, China

2. State Key Laboratory of Water Resource Protection and Utilization in Coal Mining, Chuanghua Road, Changping district, Beijing 100011, China

Abstract

Abstract In order to reduce the cost of chemical softening, the seeded precipitation assisted nanofiltration (NF) process was introduced into zero liquid discharge (ZLD) of flue-gas desulfurization (FGD) wastewater treatment. A pilot-scale system was developed and run for 168 h in a coal-fired power plant. The system mainly consists of lime softening, ambient temperature crystallizer (ATC) and NF, in which the raw water treatment capacity was 1 m3/h. The results indicated that the system operated stably, the softening cost was 13.30 RMB/m3, and the electricity cost was 3.39 RMB/m3 for the FGD wastewater in this pilot system. High quality gypsum was got from the ATC unit, of which the purity was 95.8%. Through this system, the hardness removal rate was higher than 98.9% and the water recovery rate reached 96%. In addition, the pressure and permeate flux kept stable in the ultrafiltration (UF) unit and NF unit, indicating no scaling occurred in the two units during 168 h test. Thus, a feasible and cost-effective process was provided by using the seeded precipitation assisted NF to deal with the FGD wastewater.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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