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Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce

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  • Hyun-Hee Jang

    (Department of Environmental and Chemical Engineering, Eco-Friendly Offshore Plant FEED Engineering Course, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon-si, Gyeongsangnam-do 51140, Korea)

  • Gyu-Tae Seo

    (Department of Environmental and Chemical Engineering, Eco-Friendly Offshore Plant FEED Engineering Course, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon-si, Gyeongsangnam-do 51140, Korea
    School of Civil, Environmental and Chemical Engineering, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon-si, Gyeongsangnam-do 51140, Korea)

  • Dae-Woon Jeong

    (Department of Environmental and Chemical Engineering, Eco-Friendly Offshore Plant FEED Engineering Course, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon-si, Gyeongsangnam-do 51140, Korea
    School of Civil, Environmental and Chemical Engineering, Changwon National University, 20 Changwondaehak-ro, Uichang-gu, Changwon-si, Gyeongsangnam-do 51140, Korea)

Abstract

Currently, the ozone (O 3 ) oxidation efficiency in the treatment of waste soy sauce provides 34.2% color removal and a 27.4% reduction in its chemical oxygen demand (COD). To improve the O 3 oxidation efficiency, hydrogen peroxide (H 2 O 2 ) is used to cause a H 2 O 2 /O 3 process. In H 2 O 2 /O 3 process experiments, a previously optimized pH of 11 and applied O 3 dose of 50 mg L −1 were used and the H 2 O 2 /O 3 ratio was varied between 0.1 and 0.9 in intervals of 0.2. The results show that an H 2 O 2 /O 3 ratio of 0.3 results in the highest efficiencies in terms of color removal (51.6%) and COD reduction (33.8%). Nanofiltration (NF) was used to pretreat the waste soy sauce to improve color removal and COD reduction. The results showed that NF with an NE-70 membrane results in 80.8% color removal and 79.6% COD reduction. Finally, the combination of NF and H 2 O 2 /O 3 process resulted in the best treatment efficiency: 98.1% color removal and 98.2% COD reduction. Thus, NF & H 2 O 2 /O 3 process can be considered as one of the best treatment methods for waste soy sauce, which requires high intrinsic color removal and COD reduction efficiencies.

Suggested Citation

  • Hyun-Hee Jang & Gyu-Tae Seo & Dae-Woon Jeong, 2018. "Advanced Oxidation Processes and Nanofiltration to Reduce the Color and Chemical Oxygen Demand of Waste Soy Sauce," Sustainability, MDPI, vol. 10(8), pages 1-12, August.
    • Handle: RePEc:gam:jsusta:v:10:y:2018:i:8:p:2929-:d:164298
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    References listed on IDEAS

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    1. Yun Chen Ching & Ghufran Redzwan, 2017. "Biological Treatment of Fish Processing Saline Wastewater for Reuse as Liquid Fertilizer," Sustainability, MDPI, vol. 9(7), pages 1-26, June.
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