Development of Zero Liquid and Waste Discharge Treatment for Dye Factory Wastewater by Biological and Coagulation Process

2022 Fiscal Year Final Research Report

• Project/Area Number: 19K12392
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 64020:Environmental load reduction and remediation-related
• Research Institution: Kagawa National College of Technology
• Principal Investigator: TAGAWA TADASHI 香川高等専門学校, 建設環境工学科, 教授 (30390511)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Keywords: 染色排水 / 脱色 / 嫌気性DHS / 共代謝

Outline of Final Research Achievements

In developing countries, water pollution problems are becoming more serious, and one of the causes is the color pollution of industrial wastewater by insufficiently treated wastewater due to the absence of color standards in the effluent standards. This study aims to develop a low-cost biological decolorization wastewater treatment system. To establish a microflora that contributes to decolorization, acclimation cultures to the dye were conducted in a batch cultivation system using microorganisms from leaf mold, cow dung, and urban sewage digestion sludge. The results showed that decolorization rates of more than 50% were obtained when co-metabolite substrates were added, especially in cultures without aeration and with organic substrates, suggesting that additional experiments are needed to improve the decolorization rate and to completely mineralize the dye.

Free Research Field

嫌気性排水処理

Academic Significance and Societal Importance of the Research Achievements

染色排水処理は先進国では活性汚泥、凝集沈殿、オゾン+活性炭処理などで脱色が十分に行われるが、途上国での適応は設備が複雑かつ高額であるため、適応は難しく、現状では大幅に着色した処理水が河川や海に放流され、観光地などでは景観など問題になっている。本研究では簡便な嫌気性DHSリアクター1台に腐葉土や嫌気性消化汚泥にて培養した汚泥を用いて、紅茶の葉の廃棄物から抽出した排水を一部添加することにより、嫌気性微生物の共代謝反応により脱色が促進されることをつきとめた。社会的意義として、脱色の簡便なシステムの開発、廃棄物の有効利用など、途上国において導入のしやすい技術が開発された点であると言える。