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A Separation and Desalination Process for Farmland Saline-Alkaline Water

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  • Qiaonan Yang

    (College of Mechanical and Electrical Engineering, Tarim University, Alar 843300, China
    Agricultural Engineering Key Laboratory, Universities of Education Department of Xinjiang Uygur Autonomous Region, Tarim University, Alar 843300, China)

  • Can Hu

    (College of Mechanical and Electrical Engineering, Tarim University, Alar 843300, China
    Agricultural Engineering Key Laboratory, Universities of Education Department of Xinjiang Uygur Autonomous Region, Tarim University, Alar 843300, China)

  • Jie Li

    (College of Mechanical and Electrical Engineering, Tarim University, Alar 843300, China
    Agricultural Engineering Key Laboratory, Universities of Education Department of Xinjiang Uygur Autonomous Region, Tarim University, Alar 843300, China)

  • Xiaokang Yi

    (College of Mechanical and Electrical Engineering, Tarim University, Alar 843300, China
    Agricultural Engineering Key Laboratory, Universities of Education Department of Xinjiang Uygur Autonomous Region, Tarim University, Alar 843300, China)

  • Yichuan He

    (College of Mechanical and Electrical Engineering, Tarim University, Alar 843300, China
    Agricultural Engineering Key Laboratory, Universities of Education Department of Xinjiang Uygur Autonomous Region, Tarim University, Alar 843300, China)

  • Jie Zhang

    (College of Mechanical and Electrical Engineering, Tarim University, Alar 843300, China
    Agricultural Engineering Key Laboratory, Universities of Education Department of Xinjiang Uygur Autonomous Region, Tarim University, Alar 843300, China)

  • Zhilin Sun

    (Ocean College, Zhejiang University, Hangzhou 310058, China)

Abstract

Salination poses serious hazards to farmland soil. For the purpose of solving soil salination, desalination of water sources, and other problems faced by arid areas, a separation and desalination process for farmland saline-alkaline water is proposed; a separation and desalination device based on this process is also presented and tested. Results indicate that water associated with the pretreatment device satisfied the working conditions of the composite nanofiltration (NF)-reverse osmosis (RO) membrane system. The composite NF-RO membrane system produced a better filtering effect than either the NF membrane or the RO membrane. When used for filtering saline-alkaline water, the composite NF-RO membrane system achieved a desalination rate of 96.06%, a total hardness removal rate of 98.93%, and a Cl- removal rate of 99.32%, adhering to the standard for irrigation water quality. The flashing-condensation process realized a fresh water recovery rate greater than 70%. During brine evaporation using solar salt making processes, the primary compound of crystals precipitated was NaCl (with a relative content of 93%), suggesting that the precipitates have the potential values of industrial salts. These findings offer new technical references for solving the problem of farmland irrigation water faced by saline-alkaline areas worldwide.

Suggested Citation

  • Qiaonan Yang & Can Hu & Jie Li & Xiaokang Yi & Yichuan He & Jie Zhang & Zhilin Sun, 2021. "A Separation and Desalination Process for Farmland Saline-Alkaline Water," Agriculture, MDPI, vol. 11(10), pages 1-16, October.
    • Handle: RePEc:gam:jagris:v:11:y:2021:i:10:p:1001-:d:655271
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    References listed on IDEAS

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    Cited by:

    1. Marcelo A. Guancha-Chalapud & Liliana Serna-Cock & Diego F. Tirado, 2022. "Hydrogels Are Reinforced with Colombian Fique Nanofibers to Improve Techno-Functional Properties for Agricultural Purposes," Agriculture, MDPI, vol. 12(1), pages 1-10, January.
    2. Qiaonan Yang & Can Hu & Jie Li & Xiaokang Yi & Jie Zhang & Zhilin Sun, 2022. "Design and Testing of a Separation and Desalination Device for Farmland Saline–Alkaline Water in Arid Areas," IJERPH, MDPI, vol. 19(10), pages 1-18, May.

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