During wastewater treatment by integrated algal pond systems (IAPS), microalgal-bacterial flocs (MaB-flocs) form naturally but periodically disaggregate, resulting in poor settling, low biomass recovery, and reduced effluent quality. This study investigates biotic/abiotic-induced changes in microbial community structure in high-rate algal oxidation ponds (HRAOP) of an IAPS on MaB-floc formation and stability during sewage treatment. Results show that dominance by Pseudopediastrum, Desmodesmus and Micractinium species in spring and summer and the chytrids, Paraphysoderma sp. in spring and Sanchytrium sp. in summer, occurred coincident with enhanced MaB-floc formation and biomass recovery (≥90%). In winter, poor floc formation and low biomass recovery were associated with dominance by Desmodesmus, Chlorella, and the Chlorella-like genus Micractinium. A principal components analysis (PCA) confirmed that combinations of colonial microalgae and associated parasitic chytrids underpin MaB-floc formation and stability in spring and summer and that unicells dominated in winter. Dominance by Thiothrix sp. coincided with floc disaggregation. Thus, changes in season, composition and abundance of colonial microalgae and associated parasitic fungi appeared to impact MaB-floc formation, whereas species composition of the bacterial population and emergence of Thiothrix coincided with floc instability and disaggregation.

在综合藻池系统 (IAPS) 废水处理过程中，微藻-细菌絮凝物 (MaB-絮凝物) 会自然形成，但会定期分解，导致沉降不良、生物量回收率低和出水水质下降。本研究调查了 IAPS 的高速藻类氧化池 (HRAOP) 中生物/非生物引起的微生物群落结构变化对污水处理过程中 MaB 絮凝物形成和稳定性的影响。结果表明，  春季和夏季，  Pseudodiastrum、  Desmodesmus 和 Micractinium物种占优势，而壶菌、 Paraphysoderma  sp. 占优势。在春天和 Sanchytrium  sp。在夏季，与 MaB 絮凝物形成和生物量回收率增强（≥90%）同时发生。在冬季，絮体形成不良和生物量回收率低与链带藻、 小球藻和类小球藻属 Micractinium的优势有关 。主成分分析 (PCA) 证实，群落微藻和相关寄生壶菌的组合支撑了春季和夏季 MaB 絮凝体的形成和稳定性，而单细胞在冬季占主导地位。Thiothrix sp的优势  。与絮凝体解聚同时发生。因此，季节、群落微藻和相关寄生真菌的组成和丰度的变化似乎影响 MaB 絮凝物的形成，而细菌种群的物种组成和 硫丝菌的出现 与絮凝物的不稳定和分解相一致。