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Biotreatment of high-salinity wastewater: current methods and future directions

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Abstract

Saline wastewaters are usually generated by various industries, including the chemical, pharmaceutical, agricultural, and aquacultural industries. The discharge of untreated high-salinity wastewater may cause serious environmental pollution and damage the aquatic, terrestrial, and wetland ecosystems. For many countries, the treatment of saline wastewater has become an important task. Generally, saline wastewaters are treated through physical and chemical methods. However, these traditional techniques are associated with higher treatment costs and the generation of byproducts. In contrast, biotreatment techniques are environmentally friendly and inexpensive. This review highlights the sources and environmental concerns of high-salinity wastewater and illustrates the latest problems and solutions to the use of biological approaches for treating saline wastewater. Although high salinity may inhibit the effectiveness of aerobic and anaerobic biological wastewater treatment methods, such strategies as selecting salt-adapted microorganisms capable of degrading pollutants with tolerance to high salinity and optimizing operating conditions can be effective. This mini-review may serve as a reference for future efforts to treat high-salinity wastewater.

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Fig. 1

Source and entry pathway of high salinity wastewater in the environment

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Acknowledgements

We sincerely thank Dr. Ian Maddox for the invitation and encouragement to submit this paper.

Funding

This study was supported by the National Natural Science Foundation of China (21777086), Taishan Scholars Program of Shandong Province (tsqn201909005), Key Research & Developmental Program of Shandong Province (2019JZZY020308), the Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (ES201801), Natural Science Foundation for Distinguished Young Scholars of Shandong Province (JQ201809), Young Scholars Program of Shandong University (2016WLJH16, 2020QNQT012), Shandong Provincial Water Conservancy Research and Technology Promotion Project (SDSLKY201802), CNPC Research Institute of Safety and Environmental Technology, and China Association of Marine Affairs (CAMA) and Association of Ocean of China (AOC) (CAMAJJ201808).

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YZ, XZ and S-QN wrote the paper; SA, SS and S-QN revised the paper.

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Correspondence to Shou-Qing Ni.

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Authors declare no conflict of interest/competing interests.

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Zhao, Y., Zhuang, X., Ahmad, S. et al. Biotreatment of high-salinity wastewater: current methods and future directions. World J Microbiol Biotechnol 36, 37 (2020). https://doi.org/10.1007/s11274-020-02815-4

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  • DOI: https://doi.org/10.1007/s11274-020-02815-4

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