期刊
BIORESOURCE TECHNOLOGY
卷 393, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2023.130013
关键词
Membrane fouling; Nitrogen removal; Biomass concentration; Microbial mechanism
This study aimed to alleviate membrane fouling and improve nitrogen removal by applying high sludge concentration in MBR. The results showed that high sludge concentration enhanced total nitrogen removal and reduced pressure development rate. Microbial community analysis revealed the enrichment of functional bacteria associated with nitrogen removal and the inhibition of Thiothrix overgrowth. Moreover, key genes involved in nitrogen metabolism and amino acid degradation were up-regulated under high sludge concentration. Overall, high sludge concentration improved microbial assembly and functional gene abundance, which enhanced nitrogen removal and alleviated membrane fouling.
Currently, severe membrane fouling and inefficient nitrogen removal were two main issues that hindered the sustainable operation and further application of membrane bioreactor (MBR). This study aimed to simultaneously alleviate membrane fouling and improve nitrogen removal by applying high sludge concentration in MBR. Results showed that high sludge concentration (12000 mg/L) enhanced total nitrogen removal efficiency (78 %) and reduced transmembrane pressure development rate. Microbial community analysis revealed that high sludge concentration enriched functional bacteria associated with nitrogen removal, increased filamentous bacteria fraction in bio-cake and inhibited Thiothrix overgrowth in bulk sludge. From molecular level, the key genes involved in nitrogen metabolism, electron donor/adenosine triphosphate production and amino acid degradation were up-regulated under high sludge concentration. Overall, high sludge concentration improved microbial assembly and functional gene abundance, which not only enhanced nitrogen removal but also alleviated membrane fouling. This study provided an effective strategy for sustainable operation of MBR.
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