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Application research of PVDF membrane contactor in the treatment of ammonia-containing wastewater in power plants

Authors： LV Jiahui，DAI Jie，SHI Guozhong，CEN Yi，XU Haoran，FENG Xiangdong，ZHANG Lin

Units： Zhejiang Energy Group R&D Co., Ltd., Hangzhou 311121, China; 2. Zhejiang Zheneng Zhenhai Power Generation Co., Ltd., Ningbo 315200, China; 3. Engineering Research Center for New Industrial Water Resources of Zhejiang Province, Hangzhou 311121, China; 4. Zhejiang Key Laboratory of Thermal Power Generation Energy Efficiency and Pollutant Control Technology, Hangzhou 311121, China; 5. College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310058, China

KeyWords： membrane contactor; ammonia-containing wastewater; coal fired power plants; Denitrification flux; polyvinylidene fluoride

ClassificationCode：X703

year,volume(issue):pagination： 2024,44(1):123-129

Abstract：

The ammonia-containing wastewater from coal-fired power plants has the characteristics of large water volume, high ammonia-nitrogen concentration, and large water quality fluctuations, making conventional ammonia removal processes difficult to treat. In this paper, PVDF membrane contactor was used to treat high-concentration ammonia-containing wastewater from coal-fired power plants. The effects of membrane contactor type, water flow, gas vacuum, gas-liquid contact area and influent water quality on nitrogen removal efficiency were investigated. The results show that the gas-liquid separation process based on PVDF membrane contactors can reduce the concentration of ammonia nitrogen in high-concentration ammonia containing wastewater from 1250mg/L to below 300mg/L. Both external and internal pressure membrane contactors have ideal application effects; The mass transfer efficiency of NH3 can be effectively improved by increasing the flow rate of water side and the vacuum degree of air side; Increasing the mass transfer membrane area can significantly improve the removal rate of ammonia nitrogen in circulating liquid. Multiple resource utilization pathways for separating NH3 in coal-fired power plants have been proposed, which provides reference for the engineering application of membrane contactors.

Funds：

浙江省“领雁”计划项目(2022C03048)。

AuthorIntro：

吕佳慧（1991-），女，浙江绍兴人，工程师，研究方向为工业水处理技术研发

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