膜科学与技术

混合脱盐工艺改善黄河中游煤矿区浅层地下水水质研究

作者：张全，刘基，胡骁，王淑璇，葛光荣，杨建

单位：中煤科工西安研究院（集团）有限公司，陕西西安710054

关键词：反渗透；纳滤；硝酸根；健康指数

出版年,卷(期):页码： 2023,43(3):131-139

摘要：

黄河流域中游煤矿区浅层含水层地下水为当地生活饮用水的主要来源，应用感官指数和健康指数对水质进行定量评价，发现部分浅层地下水存在硝酸氮超标风险。采用纳滤浓水与反渗透产水混合工艺，考察了纳滤膜类型、膜系统、压力和回收率对产水水质的影响，对比了不同回收率下纳滤产水水质的理论预测值及实测值，开展了混合脱盐工艺与传统的反渗透产水与超滤产水勾兑工艺的技术适用性及经济性分析。结果表明，纳滤系统运行压力与硝酸氮透过率负相关。最佳运行条件是采用NTF40纳滤膜、运行压力为0.4MPa且回收率为60%，纳滤浓水与反渗透产水的混合水离子浓度适中，且阴/阳离子比重明显改善，硝酸氮质量浓度相比原水下降56.1%，与预测产水水质偏差小于10%。混合脱盐方案综合回收率高达94%，相比传统反渗透与超滤产水勾兑方案具有潜在的技术优势和经济效益。

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.

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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