GENGMing-yue,GUOHai-juan,MAFang,et al.Effect of Inoculating Fungal Pellets on Sludge Agglomeration and Microbial Community[J].China Water & Wastewater,2022,38(17):104-111.
Effect of Inoculating Fungal Pellets on Sludge Agglomeration and Microbial Community
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第17期
Page:
104-111
Column:
Date of publication:
2022-09-01
- Keywords:
- fungal pellet; sludge agglomeration; sludge surface characteristic; microbial quorum sensing; microbial community
- Abstract:
- The surface characteristics, quorum sensing and microbial community of sludge from sequencing batch reactors (SBR) inoculated with and without fungal pellets (experimental group and blank group) were compared to comprehensively investigate the effect of inoculating fungal pellets on sludge agglomeration. The fungal pellets increased the sludge hydrophobicity (40%-67%), Zeta potential (-15 mV to -8 mV), microbial attachment (0.5-1.7) and functional group intensity in the reactor, effectively reduced the repelling force between microbial cells, and contributed to the mutual agglomeration of microorganisms. In addition, the fungal pellets enhanced the microbial quorum sensing system mediated by acyl?homoserine lactone (AHLs), and the content of AHLs in experimental group was 101.1 ng/gMLSS, which was higher than that in blank group (74.3 ng/gMLSS). Analysis of the microbial community showed that inoculating fungal pellets increased the diversity and richness of microorganisms in the reactor, and enriched the functional bacteria with adhesion and AHLs producing abilities. The improvement of sludge surface characteristics, enhancement of microbial quorum sensing and enrichment of functional bacteria promoted the agglomeration of microorganisms and formation of aggregates, and improved sludge settling performance and biomass retention in the SBR.
Last Update:
2022-09-01