低C/N污水培养好氧颗粒污泥研究进展

Research Progress of Aerobic Granular Sludge Cultivated in Low C/N Sewage

【目的】为解决低C/N污水难以培养好氧颗粒污泥(Aerobic Granular Sludge,AGS)的问题,对AGS的形成机理、影响因素等方面进行研究分析。【方法】综述了AGS形成的4种学说和影响AGS形成以及处理效果的6种因素,分析了AGS国内外工程应用情况,总结了AGS培养过程中的相关问题。【结果】低C/N污水培养AGS的过程中会受到原水基质浓度低、氮磷负荷难以协调的问题,还会受到溶解氧、曝气模式、剪切力、污泥龄、温度和周期设置的影响,颗粒化困难。后续可通过更改培养参数和运行策略满足生产需求。【结论】低C/N污水水质成分复杂,往往包含部分工业尾水,须规范行业制度,为AGS技术提供良好环境。低C/N污水培养AGS要求各类学科紧密配合,系统性整合产业链。通过工艺协调进水负荷,满足生产需求。此外还能通过采用协同处理的模式,引入工业废液改善水质,降低培养难度。

[Purposes]In order to solve the problem that low C/N sewage is difficult to cultivate aerobic granular sludge(AGS),the formation mechanism and influencing factors of AGS were studied and ana⁃lyzed.[Methods]This paper summarizes 4 theories of AGS formation and 6 factors affecting AGS forma⁃tion and treatment effect,analyzes the engineering application of AGS at home and abroad,and summa⁃rizes the related problems of AGS cultivation process.[Findings]The process of cultivating AGS in low C/N sewage will be affected by the low concentration of raw water matrix and the difficulty in coordinat⁃ing nitrogen and phosphorus loads.It will also be affected by dissolved oxygen,aeration mode,shear force,sludge age,temperature and cycle settings,making granulation difficult.Subsequent production needs can be met by changing the cultivation parameters and operation strategy.[Conclusions]The wa⁃ter quality of low C/N sewage is complex and often includes some industrial tail water.It is necessary to standardize the industry system to provide a good environment for AGS technology.The cultivation of AGS in low C/N sewage requires the close cooperation of various disciplines and the systematic integra⁃tion of the industrial chain.The influent load is coordinated through the process to meet production needs.In addition,by adopting the mode of co-processing,the introduction of industrial waste liquid can improve water quality and reduce the difficulty of cultivation.