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Optimization of Removal Heavy Metal Ions from High-salt Wastewater by Nanofiltration based on Response Surface Methodology

Authors： LI Yaning1,2, HAO Yachao1,LI Liang1,ZHANG Chengkai1,YUAN Junsheng2,FU Chunming1,XIAO Caiying1,HAO Runqiu1,ZHANG Chengkai1,LIU Qi1

Units： 1. CNOOC Tianjin Chemical Research and Design Institute Co., Ltd.,，Tianjin 300384 ; 2. Hebei University of Technology, Tianjin 300130

KeyWords： response surface methodology (RSM); heavy metal ions depth removal; high-salt wastewater

ClassificationCode：x789

year,volume(issue):pagination： 2020, 40(6):111-117

Abstract：

Response surface methodology (RSM) was used to study the process of deep removal of heavy metal ions from high-salt coal-based oil-making wastewater by nanofiltration. The fitting results showed that NF90-2540 has the best interception of heavy metal ions and the retention rate can reach 97.5% under the conditions of C（EDTA）:C（M2+）= 1.0:1.1、osmotic pressure= 1.89 MPa、pH= 4.1、feed flow rate= 298.9 L/h. Through analysis of the three-dimensional perspective and contour plots in the response surface methodology, it can be seen that when complexing nanofiltration intercepts heavy metal ions in wastewater, it is mainly affected by the steric hindrance of the nanofiltration membrane. The interaction between complexing agent and pH was significant, indicating that the complexation of heavy metal ions with complexing agents is mainly affected by pH. The interaction of other factors was not significant.

Funds：

国家重大专项（2017ZX07017-002-01）, 国家重大专项（2017ZX07017-002-02）

AuthorIntro：

李亚宁（1992-），男，河北衡水，助理工程师，硕士研究生，研究方向为工业水处理，E-mail：1582827623@qq.com

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