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Study of NF/RO mixed desalination process improving the shallow aquifer groundwater quality in the coal mining area of the middle Yellow River

Authors： ZHANG Quan, LIU Ji, HU Xiao, WANG Shuxuan, GE Guangrong,YANG Jian

Units： Xi'an Research Institute, CCTEG Xi'an Research Institute., Xi'an 710054, China

KeyWords： reverse osmosis; nanofiltration; nitrate; health index

ClassificationCode：X703

year,volume(issue):pagination： 2023,43(3):131-139

Abstract：

The shallow aquifer groundwater in the coal mining area in the middle Yellow River is the main source of local drinking water. The taste index and health index are used to quantitatively evaluate the water quality, and it is found that there is a risk that nitrate nitrogen exceeds the national drinking water standard index in most of the shallow aquifer groundwater. The mixed process of nanofiltration(NF) concentrated water and reverse osmosis(RO) produced water is used to improve the water quality. The effects of nanofilter membrane type, pressure and recovery rate on the water quality improvement process are investigated, and the predicted produced water quality is compared with the measured produced water. The technical and economic advantages of the mixed desalination process is discussed comparing with the traditional RO/UF produced water mixed process. The results show that the operating pressure of the nanofiltration system is negatively related to the permeability of nitrate nitrogen. The best operating condition is that NTF40 nanofiltration membrane is used, the operating pressure is 0.4MPa, and the recovery is 60%. The mixed water of nanofiltration concentrated water and reverse osmosis produced water has moderate ion concentration, and the specific gravity of cation and anion has been significantly improved. The mass concentration of nitrate nitrogen has decreased by 56.1% compared with the raw water, and the deviation from the predicted produced water quality is less than 10%. The comprehensive recovery rate of the mixed desalination process is as high as 94%, which has potential economic benefits and advantages compared with the traditional RO and ultrafiltration (UF) water production blending process.

Funds：

国家重点研发计划项目（2016YFC0501104）；陕西省重点研发计划资助项目（2022SF-046）

AuthorIntro：

张全(1991—)，男，安徽桐城人，硕士,助理研究员，主要从事矿井水资源化利用研究。E-mail:zhangquan@cctegxian.com

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