State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Environmental Science and Engineering, Donghua University, Room 4161, No. 4 Academic Building, No. 2999, North Renmin Road, Songjiang District, Shanghai 201620, China.
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Environmental Science and Engineering, Donghua University, Room 4161, No. 4 Academic Building, No. 2999, North Renmin Road, Songjiang District, Shanghai 201620, China.
Water Res. 2024 Oct 1;263:122166. doi: 10.1016/j.watres.2024.122166. Epub 2024 Jul 27.
Anaerobic Membrane Bioreactor (AnMBR) are employed for solid-liquid separation in wastewater treatment, enhancing process efficiency of digestion systems treating digestate. However, membrane fouling remains a primary challenge. This study operated a pilot-scale AnMBR (P-AnMBR) to treat high-concentration organic digestate, investigating system performance and fouling mechanisms. P-AnMBR operation reduced acid-producing bacteria and increased methane-producing bacteria on the membrane, preventing acid accumulation and ensuring stable operation. The P-AnMBR effectively removed COD and VFA, achieving removal rates of 82.3 % and 92.0 %, respectively. Higher retention of organic nitrogen and lower retention of ammonia nitrogen were observed. The membrane fouling consisted of organic substances (20.3 %), predominantly polysaccharides, and inorganic substances (79.7 %), primarily Mg ions (10.1 %) and Ca ions (4.5 %). To reduce the increased transmembrane pressure (TMP) caused by fouling (a 10.6-fold increase in filtration resistance), backwash frequency experiment was conducted. It revealed a 30-min backwash frequency minimized membrane flux decline, facilitating recovery to higher flux levels. The water produced amounted to 70.3 m³ over 52 days. The research provided theoretical guidance and practical support for engineering applications, offering practical insights for scaling up P-AnMBR.
厌氧膜生物反应器（AnMBR）用于污水处理中的固液分离，提高了处理消化液的消化系统的工艺效率。然而，膜污染仍然是一个主要挑战。本研究采用中试规模的 AnMBR（P-AnMBR）处理高浓度有机消化液，考察了系统性能和污染机制。P-AnMBR 运行时，产酸菌减少，产甲烷菌在膜上增加，防止了酸积累，确保了稳定运行。P-AnMBR 有效地去除了 COD 和 VFA，分别达到了 82.3%和 92.0%的去除率。观察到有机氮的保留率较高，氨氮的保留率较低。膜污染由有机物质（20.3%），主要是多糖，和无机物质（79.7%），主要是 Mg 离子（10.1%）和 Ca 离子（4.5%）组成。为了降低污染引起的跨膜压力（TMP）增加（过滤阻力增加了 10.6 倍），进行了反冲洗频率实验。结果表明，30 分钟的反冲洗频率最小化了膜通量的下降，有助于恢复到更高的通量水平。在 52 天内产生了 70.3 立方米的水。该研究为工程应用提供了理论指导和实践支持，为 P-AnMBR 的放大提供了实用见解。
