科研成果-下载亚博

abstract:

activated sludge processes with an ultra-short sludge retention time (ultra-short-srt) are considered to have potential for energy and resource recovery from wastewater. the present study focused on the sludge characteristics, system performance and microbial kinetics in ultra-short-srt activated sludge (ussas) processes using typical domestic wastewater (srt = 0.5, 1, 2, 3 and 4 d). the results showed that compared with the sludge in conventional activated sludge (cas) processes, the sludge structure in ussas system was looser (fractal dimension, d_2p, 1.19–1.33), the boundary was rougher (pore boundary fractal dimension, d_b, 1.44–1.59), the sludge concentration was lower, and the sludge volume index (svi) was higher; bacteria such as thiothrix and trichococcus that cause sludge bulking, which poses an operation risk, were extensively detected, especially at srts of 0.5 d and 1.0 d. the performance in terms of total chemical oxygen demand (tcod) and phosphorus removal increased with increasing srt, and the highest removal rate (approximately 85% for tcod and 90% for phosphorus) was observed when the srt was 4 d. both bioconversion and biosorption were responsible for the c/p separation, and their roles were different for different types of organic matter and phosphorus under different srt conditions. the proportion of phosphate-accumulating organisms (pao) reached 2.4% when the srt was 3 d, resulting in highly effective biological phosphorus removal. the values of microbial kinetic parameters such as y_h and k_dh in ussas systems were higher than those in cas systems, indicating faster microbial community renewal. this study was helpful for understanding the characteristics of ussas process.

keywords: ultra-short-srt activated sludge process, sludge characteristics, system performance, removal of cod and phosphorus, microbial kinetics

摘要:

具有超短污泥龄（srt）的活性污泥工艺被认为具有回收废水中能源和资源潜力的工艺。本实验研究使用典型的生活污水运行的的超短srt（srt = 0.5、1、2、3和4d）活性污泥工艺系统（ussas）的污泥特性，系统性能和微生物动力学。研究结果表明，与常规活性污泥工艺（cas）相比，ussas系统中的污泥：结构更疏松（分形维数d_2p，1.19–1.33），边界更粗糙（孔边界分形维数，d_b，1.44–1.59），污泥浓度较低，污泥体积指数（svi）较高，可以检测到易引起污泥膨胀的细菌，如thiothrix 和trichococcus，这些细菌会造成操作风险，特别是在0.5d和1.0d的srt条件下；随着srt的增加，总化学需氧量（tcod）和磷的去除性能有所提高，当srt为4d时，观察到最高去除率（tcod约为85％，磷约为90％）。c/p分离是生物转化和生物吸附共同导致，在不同的srt条件下，生物转化与吸附所导致c/p分离作用不同；当srt为3 d时，聚磷菌（pao）的比例达到2.4％，从而实现了高效的生物除磷效应；ussas系统中的微生物动力学参数（例如y_h和k_dh）值高于cas系统中的值，意味着更快的微生物群落更替。这项研究有助于理解ussas系统的特征。

关键词: 超短泥龄活性污泥工艺，污泥特征，系统性能，碳磷分离性能，微生物动力学参数

原载于environment international（2020 impact factor = 7.577）

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