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Design and Testing of a Separation and Desalination Device for Farmland Saline–Alkaline Water in Arid Areas

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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
    These authors contributed equally to this work.)

  • 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
    These authors contributed equally to this work.)

  • 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)

  • 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

To solve the problem of soil salination and to desalinate saline–alkaline water in arid areas, this study involved the design and testing of a separation and desalination device for farmland saline–alkaline water that is suitable for arid areas. The results of this study indicate that after the pretreatment of farmland saline–alkaline water, the water yielded by the pretreatment device had a mean turbidity of <1 and a mean silt density index (SDI) of <3, which met the working conditions of nanofiltration (NF) and reverse osmosis (RO) membranes. When used to filter saline–alkaline water, the composite NF–RO membrane system achieved a desalination rate of 97.06%, a total hardness removal rate of 97.83%, and a Cl − removal rate of 99.65%, which satisfied the standard for irrigation water quality. Some indicators of the yielded water reached the hygienic standard for drinking water, thus successfully reutilizing water resources. The circulating solar collector tube of the device was designed with a collection area of 6 m 2 , which could basically satisfy the heat demand of the flash tank for distillation. The design of the flash tank and the shell-and-tube circulating condenser met the requirements for vapor condensation. The crystals in the solar salt box precipitated under solar action. X-ray diffraction was used to identify the primary compound of the crystals as NaCl, suggesting that the precipitates have potential value as industrial salts. This study offers new technical references and helpful engineering guidance for arid saline–alkaline enrichment areas facing the problem of saline farmland irrigation water.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:10:p:6178-:d:819154
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    References listed on IDEAS

    as
    1. Clément Lacroix & Maxime Perier-Muzet & Driss Stitou, 2019. "Dynamic Modeling and Preliminary Performance Analysis of a New Solar Thermal Reverse Osmosis Desalination Process," Energies, MDPI, vol. 12(20), pages 1-32, October.
    2. Yong-Joon Jun & Young-Hak Song & Kyung-Soon Park, 2017. "A Study on the Prediction of the Optimum Performance of a Small-Scale Desalination System Using Solar Heat Energy," Energies, MDPI, vol. 10(9), pages 1-16, August.
    3. 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.
    4. Ling Li & Hongguang Liu & Xinlin He & En Lin & Guang Yang, 2020. "Winter Irrigation Effects on Soil Moisture, Temperature and Salinity, and on Cotton Growth in Salinized Fields in Northern Xinjiang, China," Sustainability, MDPI, vol. 12(18), pages 1-27, September.
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