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Treatment of electroplating industry wastewater: a review on the various techniques

  • Recent Trends in Tertiary Treatment of Water/Wastewater
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Abstract

Water pollution by recalcitrant compounds is an increasingly important problem due to the continuous introduction of new chemicals into the environment. Choosing appropriate measures and developing successful strategies for eliminating hazardous wastewater contaminants from industrial processes is currently a primary goal. Electroplating industry wastewater involves highly toxic cyanide (CN), heavy metal ions, oils and greases, organic solvents, and the complicated composition of effluents and may also contain biological oxygen demand (BOD), chemical oxygen demand (COD), SS, DS, TS, and turbidity. The availability of these metal ions in electroplating industry wastewater makes the water so toxic and corrosive. Because these heavy metals are harmful to living things, they must be removed to prevent them from being absorbed by plants, animals, and humans. As a result, exposure to electroplating wastewater can induce necrosis and nephritis in humans and lung cancer, digestive system cancer, anemia, hepatitis, and maxillary sinus cancer with prolonged exposure. For the safe discharge of electroplating industry effluents, appropriate wastewater treatment has to be provided. This article examines and assesses new approaches such as coagulation and flocculation, chemical precipitation, ion exchange, membrane filtration, adsorption, electrochemical treatment, and advanced oxidation process (AOP) for treating the electroplating industry wastewater. On the other hand, these physicochemical approaches have significant drawbacks, including a high initial investment and operating cost due to costly chemical reagents, the production of metal complexes sludge that needs additional treatment, and a long recovery process. At the same time, advanced techniques such as electrochemical treatment can remove various kinds of organic and inorganic contaminants such as BOD, COD, and heavy metals. The electrochemical treatment process has several advantages over traditional technologies, including complete removal of persistent organic pollutants, environmental friendliness, ease of integration with other conventional technologies, less sludge production, high separation, and shorter residence time. The effectiveness of the electrochemical treatment process depends on various parameters, including pH, electrode material, operation time, electrode gap, and current density. This review mainly emphasizes the removal of heavy metals and another pollutant such as CN from electroplating discharge. This paper will be helpful in the selection of efficient techniques for treatment based on the quantity and characteristics of the effluent produced.

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Authors and Affiliations

Authors

Contributions

Sonal Rajoria: writing—original draft, data curation, conceptualization, investigation, validation. Manish Vashishtha: supervision, visualization, investigation. Vikas K. Sangal: supervision, visualization, investigation, writing—review and editing.

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Correspondence to Manish Vashishtha or Vikas K. Sangal.

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All participants gave informed consent to participate.

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The authors declare no competing interests.

Availability of data and materials

The datasets analyzed during the current study are available in the [Physical and Chemical Methods for Heavy Metal Removal]; Yadav M, Singh G, Jadeja RN (2021) Physical and Chemical Methods for Heavy Metal Removal. Pollut Water Manag 377–397. https://doi.org/10.1002/9781119693635.ch15; and [Electroplating Wastewater Treatment Method and Development Trend Analysis]; Lu BJ, Wu K (2020) Electroplating wastewater treatment method and development trend analysis. Mater Sci Eng 774:. https://doi.org/10.1088/1757-899X/774/1/012092].

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Responsible Editor: Weiming Zhang

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Rajoria, S., Vashishtha, M. & Sangal, V.K. Treatment of electroplating industry wastewater: a review on the various techniques. Environ Sci Pollut Res 29, 72196–72246 (2022). https://doi.org/10.1007/s11356-022-18643-y

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  • DOI: https://doi.org/10.1007/s11356-022-18643-y

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