Closing the water cycle for industrial laundries: An operational performance and techno-economic evaluation of a full-scale membrane bioreactor system |
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| Institution: | 1. Korea National Cleaner Production Center, Korea Institute of Industrial Technology (KITECH), Hanshin intervalley24 East B/D 18F, 322 Teheran-ro, Gangnam-gu, Seoul 135-918, Republic of Korea;2. Research Center of Sustainable Strategy, YESSorg (Your Environment & Sustainability Service Organization) Co. Ltd., Dae-o B/D 307, 148-11, 636 Achasan-ro, Gwangjin-gu,, Seoul 143-802, Repubic of Korea;1. Energy Institute at the Johannes Kepler University Linz, Altenbergerstraße 69, 4040 Linz, Austria;2. Institute for Environmental Management in Companies and Regions, Johannes Kepler University Linz, Altenbergerstraße 69, 4040 Linz, Austria;1. State University of Maringa, Department of Chemical Engineering, Maringa, 87020-900, Parana, Brazil;2. Federal University of Technology – Paraná, Department of Environmental Engineering, Apucarana, 86812-460, Parana, Brazil;1. Dept. of Environ. Eng., Inha University, Namgu, Inharo 100, Incheon, Republic of Korea;2. Samsung SDI, 56, Gosan-ro, Uiwang-si, Gyeonggi-do 437-711, Republic of Korea;3. Dept. of Civil and Environ. Eng., Stanford University, Stanford, CA 94305, USA |
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| Abstract: | To reduce the consumption of freshwater in the laundry industry, a new trend of closing the water cycle has resulted in the reuse/recycling of water. In this study, the performance of a full-scale submerged aerobic membrane bioreactor (9 m3) used to treat/reuse industrial laundry wastewater was examined over a period of 288 days. The turbidity and total solids (TS) were reduced by 99%, and the chemical oxygen demand (COD) effluent removal efficiencies were between 70% and 99%. The levels of COD removed by the membrane were significantly greater than the levels of biodegraded COD. This enabled the bioreactor to sustain COD levels that were below 100 mg/L, even during periods of low wastewater biodegradation due to bioreactor sludge. An economic evaluation of the membrane bioreactor (MBR) system showed a savings of 1.13 € per 1 m3 of water. The payback period for this system is approximately 6 years. The energy and maintenance costs represent only 5% of the total cost of the MBR system. |
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| Keywords: | Laundry wastewater Submerged membrane bioreactor Recycling Biodegradation Membrane retention Payback |
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