AI Article Synopsis
- The study focused on understanding how membrane fouling occurs in anaerobic membrane bioreactors (AnMBR) when treating swine wastewater at various organic loading rates (OLR).
- Results indicated that AnMBR effectively removes pollutants and produces energy, but higher OLR leads to worse fouling due to sludge and organic matter buildup.
- Microbial analysis revealed that increased OLR causes a change in bacterial communities, particularly the growth of fouling-related bacteria, while backwashing can help restore membrane efficiency.
Article Abstract
This study aimed to reveal the membrane fouling mechanisms during anaerobic membrane bioreactor (AnMBR) operation for swine wastewater treatment under different organic loading rates (OLR). Results showed that AnMBR could achieve high pollutant removal (71.9-83.6 %) and energy recovery (0.18-0.23 L-CH/g-COD) at an OLR range of 0.25-0.5 g-COD/g-VSS.d, realizing energy production. However, higher OLR would aggravate the membrane fouling due to accumulation of fine sludge particles, organic foulants, and extracellular polymeric substances (EPS) on cake layer. Based on the high-throughput sequencing, microbial communities significantly changed and fouling-causing bacteria (e.g. Pseudomonas, Methanosarcina and Methanothrix) enriched in the cake layer at higher OLR conditions, leading to lower membrane permeability. Backwash can effectively remove the cake layer from the membrane surface and recover membrane permeability. The present study provides important information about membrane fouling and microbial information that could have significant impact on large-scale AnMBR application.
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| http://dx.doi.org/10.1016/j.biortech.2022.127850 | DOI Listing |
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