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Title |
Evaluating the Feasibility of Plating and Industrial Wastewater through Co-Treatment Processes
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Authors |
이서홍(Seohong Lee) ; 김신호(sinho Kim) ; 배지한(jihan Bae) ; 이광언(gwangeon Lee) ; 이민서(minseo Lee) ; 최영지(youngji Choi) ; 김설빈(seolbin Kim) ; 안지현(jihyeon An) ; 정진영(jinyoung Jung) ; 최대희(daehee Cho) |
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DOI |
https://doi.org/10.15681/KSWE.2026.42.1.28 |
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Keywords |
Co-treatment; Industrial wastewater; Nitrogen removal; Plating wastewater; Pretreatment |
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Abstract |
Plating wastewater is characterized by high concentrations of cyanide (CN), heavy metals, and refractory organics, which complicates its treatment using conventional biological methods. This study assesses the feasibility of co-treating pre-treated plating wastewater with industrial effluent at a centralized treatment plant within a national industrial complex. To facilitate effective treatment, a nine-step advanced pre-treatment system was implemented, incorporating cyanide oxidation, chemical treatment, and advanced oxidation processes (AOPs). Following pre-treatment, the effluent was mixed with industrial wastewater and processed in a lab-scale anaerobic-anoxic-oxic (A2/O) bioreactor. The primary focus of the research was to determine the optimal mixing ratio and to evaluate the use of alternative external carbon sources to enhance nitrogen removal efficiency. Experimental results identified an optimal mixing ratio of 2:1, industrial to plating wastewater, which complied with legal effluent water quality standards. Notably, the use of a recovered carbon source (RCS), consisting of a glycerol-methanol mixture, significantly improved nitrogen removal efficiency compared to traditional methanol. The specific denitrification rate (SDNR) with RCS was approximately 3.1 times higher than that achieved with methanol, highlighting its effectiveness as an electron donor. Furthermore, key water quality indicators, including Total Nitrogen (TN), Total Organic Carbon (TOC), and Biochemical Oxygen Demand (BOD5), remained within legal limits. This study concludes that pre-treating plating wastewater allows for successful co-treatment with industrial effluent, offering a technically and economically viable strategy for integrated wastewater management.
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