Abstract
In aerobic granular sludge (AGS) system, N-acyl homoserine lactones (AHLs) can effectively regulate the community structure and control filamentous bulking. It would be economically feasible to make mature granules into AHLs-rich AGS extract (AE) to replace synthesized AHLs. In this study, two SBRs were run in a fully aerobic environment and a short cycle (4 h) to culture AGS: R1 with AE adding; R2 served as control. After 60 days, AGS of R1 were compact and exhibited excellent settleability (avergae size 0.77 mm, SVI 44.2 ml /g, SV30/SV5 0.97). In R2, granular filamentous overgrowth occurred. R1 granules contained higher extracellular polymeric substances and PN/PS (85.0 mg/g-VSS and 2.82) compared to R2 granules. Microbial analysis showed Thauera and Zoogloea increased by 8.7-fold and 3.6-fold in R1, while Thiothrix decreased to 0.39-fold compared to R2. AE addition can help suppress filamentous bacteria overgrowth, allowing retention of more functional microorganisms.
Published Version
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