CIESC Journal ›› 2021, Vol. 72 ›› Issue (3): 1400-1408.DOI: 10.11949/0438-1157.20200722

• Separation engineering • Previous Articles     Next Articles

Surrogate model-based optimal design of multi-stage nanofiltration separation system for saline wastewater

LU Zhibin1(),XIE Xing2,LU Sida2,HE Chang3,4(),ZHANG Bingjian3,4,CHEN Qinglin3,4   

  1. 1.School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, Guangdong, China
    2.Xi’an Aerospace Yuan Dongli Engineering Co. , Ltd. , Xi’an 710000, Shanxi, China
    3.School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, Guangdong, China
    4.Guangdong Engineering Center for Petrochemical Energy Conservation, Guangzhou 510275, Guangdong, China
  • Received:2020-06-08 Revised:2020-09-01 Online:2021-03-05 Published:2021-03-05
  • Contact: HE Chang

基于代理模型的含盐废水多级纳滤系统的过程优化设计

陆至彬1(),谢星2,鲁思达2,何畅3,4(),张冰剑3,4,陈清林3,4   

  1. 1.中山大学材料科学与工程学院,广东 广州 510275
    2.西安航天源动力工程有限公司,陕西 西安 710000
    3.中山大学 化学工程与技术学院,广东 珠海 519082
    4.广东省石化过程节能工程技术研究中心,广东 广州 510275
  • 通讯作者: 何畅
  • 作者简介:陆至彬(1998—),男,硕士研究生,luzhb6@mail2.sysu.edu.cn
  • 基金资助:
    国家自然科学基金项目(51776228);中央高校基本科研业务费专项资金(20lgpy01)

Abstract:

Based on Donnan steric pore model with dielectric exclusion (DSPM-DE), this work develops a surrogate model for the multi-stage nanofiltration separation of industrial saline wastewater. Firstly, a high-fidelity surrogate model with a high fitting degree is established to describe the DSPM-DE-based nanofiltration process via high dimensional model representation. On this basis, we construct the optimization model of multi-stage nanofiltration separation for minimizing the specific energy consumption (SEC) of unit NaCl separated. The impacts of the changing feed ratio [Cl-]/[SO42-] on the separation performance and optimal operating conditions of the nanofiltration system are investigated under the given design parameters. The results indicate that an increased feed ratio [Cl-]/[SO42-] is beneficial to improve the total recovery of NaCl and to reduce the SEC. Under the same investment cost of nanofiltration membranes, the two-stage system is superior in reducing energy consumption, and can save up to 5.84% compared with the single-stage system.

Key words: wastewater, nanofiltration, salts separation, surrogate model, specific energy consumption, optimization, energy saving

摘要:

基于道南细孔-介电DSPM-DE模型,开展了工业含盐废水多级纳滤分离系统的代理模型构建与优化研究。首先,利用高维模型表征的数学建模方法,构建与原有纳滤理论模型有高拟合度的高精度代理模型。基于此代理模型,进一步构建膜法分盐工艺中的多级纳滤分离的数学优化模型,并以分离单位质量NaCl的比能耗为优化目标,讨论在给定设计参数的条件下进料液中[Cl-]/[SO42-]的变化对不同级数纳滤系统的分盐性能及最优操作条件的影响。优化结果显示,进料[Cl-]/[SO42-]的增加有利于提高NaCl总回收率和降低分盐比能耗。在相同的纳滤膜投资成本下,双级系统在降低能耗方面更胜一筹,与单级系统相比最高可节能5.84%。

关键词: 废水, 纳滤, 分盐, 代理模型, 比能耗, 优化, 节能

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