Mechanistic insights into different illumination positions control algae production in anaerobic dynamic membrane filtration (AnDM) during decentralized wastewater treatment

• Published in: Bioresource technology 2024-05, Vol.399, p.130550-130550, Article 130550
• Main Authors: Gong, Weijia, Jiang, Mengmeng, Zhao, Yuzhou, Wang, Jinlong, Zhang, Han, Xie, Binghan, Luo, Jiaoying, Tang, Xiaobin, Liang, Heng
• Format: Article
• Language: English
• Subjects: Algae; ammonium nitrogen; Biofouling; chemical oxygen demand; Dynamic membrane (DM); Illumination; lighting; methane production; microfiltration; solar radiation; total phosphorus; Up-flow anaerobic sludge blanket (UASB); upflow anaerobic sludge blanket reactor; wastewater; wastewater treatment
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2024.130550

[Display omitted] •Illumination position affected the properties of anaerobic biofouling layer.•Average methane production was 0.28 L/d and COD removal rate was 87.05 % in UASB.•TP and TN removal in DM with direct illumination was 45.72% and 26.88%.•Indirect illumination affected flux stability and biofouling cake layer resistance. Sunlight illumination has the potential to control the stability and sustainability of dynamic membrane (DM) systems. In this study, an up-flow anaerobic sludge blanket (UASB) reactor was combined with DM under different illumination positions (direct, indirect and no illumination) to treat wastewater. Results indicated that the UASB achieved a COD removal up to 87.05 % with an average methane production of 0.28 L/d. Following treatment by the UASB, it was found that under illumination, the removal of organic substances by DM exhibited poor performance due to algal proliferation. However, the DM systems demonstrated efficient removal of ammonia nitrogen, ranging from 96.21 % to 97.67 % after stabilization. Total phosphorus removal was 45.72 %, and membrane flux remained stable when directly illuminated. Conversely, the DM system subjected to indirect illumination showed unstable membrane flux and severe fouling resistance. These findings offer valuable insights into optimizing illumination positions in DM systems under anaerobic conditions.