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    Water and nutrient recovery by a novel moving sponge - Anaerobic osmotic membrane bioreactor - Membrane distillation (AnOMBR-MD) closed-loop system

    Year: 2020

    Journal: Bioresour. Technol., Volume 312, SEP

    Authors: Nguyen Cong Nguyen; Hung Cong Duong; Chen, Shiao-Shing; Hau Thi Nguyen; Huu Hao Ngo; Guo, Wenshan; Huy Quang Le; Chinh Cong Duong; Le Thuy Trang; Anh Hoang Le; Xuan Thanh Bui; Phuoc Dan Nguyen

    Organizations: Vietnam National Foundation for Science and Technology Development (NAFOSTED)National Foundation for Science & Technology Development (NAFOSTED) [105.08-2017.311]; Vietnam Ministry of Science and Technology [B2019-DLA-0]; Ministry of Education [B2019-DLA-0]; Gia Hung Phat water treatment company limited

    Keywords: Anaerobic osmotic membrane bioreactor; Forward osmosis; Mixed draw solute; Moving sponge; Phosphorus recovery

    For the first time, a novel sponge-based moving bed-anaerobic osmosis membrane bioreactor/membrane distillation (AnOMBR/MD) system using mixed Na3PO4/EDTA-2Na as the draw solution was employed to treat wastewater for enhanced water flux and reduced membrane fouling. Results indicated that the moving sponge-AnOMBR/MD system obtained a stable water flux of 4.01 L/m(2) h and less membrane fouling for a period lasting 45 days. Continuous moving sponge around the FO module is the main mechanism for minimizing membrane fouling during the 45-day AnOMBR operation. The proposed system's nutrient removal was almost 100%, thus showing the superiority of simultaneous FO and MD membranes. Nutrient recovery from the MF permeate was best when solution pH was controlled to 9.5, whereby 17.4% (wt/wt) of phosphorus was contained in precipitated components. Moreover, diluted draw solute following AnOMBR was effectively regenerated using the MD process with water flux above 2.48 L/m(2) h and salt rejection > 99.99%.
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