YUNan,ZHUZi-jian,ZHANGNi,et al.Construction and Community Succession of Light-induced Self-assembled Algal-Bacterial Granular Sludge System[J].China Water & Wastewater,2025,41(17):11-19.
Construction and Community Succession of Light-induced Self-assembled Algal-Bacterial Granular Sludge System
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第17期
Page:
11-19
Column:
Date of publication:
2025-09-01
- Keywords:
- residual sludge; light induction; algal-bacterial granular sludge; extracellular polymeric substances; microbial community structure
- Abstract:
- The feasibility of constructing an algal-bacterial granular sludge (ABGS) system using light?induced microalgae generation and the regularity of the succession of microflora was systematically investigated based on residual sludge from an urban wastewater treatment plant. Results showed that the microalgae biomass proliferated significantly after 30 days of light-induced cultivation, adhering to the bacteria to form aggregates that provided nuclei, which was accompanied by the secretion of more extracellular polymeric substances (EPS) with a high protein content. After 50 days, pelleting was successfully achieved through the synergistic recombination of bacteria and algae. The sedimentation performance and biomass of ABGS were significantly improved during the mature stage, achieving efficient pollutants removal performance of (88.51±2.54)% and (81.28±2.29)% for COD and TN, respectively. Community succession analysis revealed that the relative abundance of EPS-producing bacteria, such as Zoogloeaceae and Rhodocyclaceae, was as high as 12.76% during the formation period, which effectively strengthened the rapid formation of ABGS and the maintenance of particle stabilisation. Meanwhile, the dominant flora, such as Paracoccaceae, Xanthomonadaceae, and other advantageous algae, such as Naviculaceae and Gomphonemataceae, guaranteed the excellent pollutants removal performance of the particles through enrichment and synergistic symbiosis. It can be seen that residual sludge can achieve bacterial and algal recombination under light induction, forming ABGS with efficient pollutants degradation performance, which provides theoretical reference for the engineering application of ABGS systems.
Last Update:
2025-09-01