关键词: 好氧颗粒污泥, 结构稳定性, 技术路径, 强化策略, 群体感应-晶核凝聚共诱导造粒

Abstract:

Aerobic granular sludge has received considerable attention in the upgrading of conventional activated sludge performance owing to its strong impact resistance and excellent decontamination effect. However, its long formation time and weak stability limit its commercial application in wastewater treatment plants. To incorporate aerobic granular sludge technology in the field of wastewater treatment, it is necessary to recognize the key factors influencing the formation mechanism and structural stability in depth to achieve the purpose of precisely regulating the formation process and realizing long-term stable and effective use. In this study, the formation mechanism of aerobic granular sludge was systematically collected and analyzed in the relevant research literature, and the formation mechanism mainly focused on seven major hypotheses: nucleation theory, principle of self-coalescence, extracellular polymer hypothesis, filamentous bacterial hypothesis, cellular hydrophobicity hypothesis, selective pressure-driven hypothesis, and stage hypothesis. The key influences on its stability were analyzed from both macro and micro perspectives. Macroscopically, factors such as the reactor height-to-diameter ratio, hydraulic shear, and organic loading rate affect the formation and stability of aerobic granular sludge. Factors including microbial community sensing and secreted extracellular polymers also play important roles. The composition and function of the microbial community of aerobic granular sludge were elaborated in detail, and the intrinsic correlation between the microbial community of aerobic granular sludge and the stability performance of the granular structure was further analyzed. Based on the above research progress, combined with the actual situation and needs of engineering applications, structural stability strengthening strategies for aerobic granular sludge were summarized, including controlling the sludge particle size, improving feed and aeration methods, regulating extracellular polymer secretion, and regulating quorum sensing. The preliminary conceptualization of a technological path was based on biological enhancement, disintegration, and regranulation. The main feature was the theoretical fusion of the biological, physicochemical, and chemical properties, which may represent the research direction of quorum nucleation-co-induced granulation to a certain extent.

Key words: aerobic granular sludge, structural stability, technology path, enhanced strategy, quorum sensing-nucleation-co-induced granulation