The effect of COD loading on the granule-based enhanced biological phosphorus removal system and the recoverability
In this study,the effect of varied COD loading (200,400,500,600 and 800 mg L1) on stability and recoverability of granule-based enhanced biological phosphorus removal (EBPR) system was investigated during continuously 53-d operation.Results showed that COD loading higher than 500 mg L1 could obviously deteriorate the granular EBPR system and result in sludge bulking with filamentous bacteria.High COD loading also changed the transformation patterns of poly-b-hydroxyalkanoates (PHAs) and glycogen in metabolism process of polyphosphate-accumulating organisms (PAOs) and inhibited the EPS secretion,which completely destroyed the stability and integrality of granules.Results of FISH indicated that glycogen-accumulating organisms (GAOs) and other microorganisms had a competitive advantage over PAOs with higher COD loading.The community composition and EBPR performance were recovered irreversibly in long time operation when COD loading was higher than 500 mg L-1.
Granule-based EBPR system COD loading Extracellular polymeric substances Metabolism process of PAOs Recoverability
Shenjing Yu Peide Sun Wei Zheng Lujun Chen Xiongliu Zheng Jingyi Han Tao Yan
School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, Chi Zhejiang Provincial Key Laboratory of Water Science and Technology, Yangtze Delta Region Institute o School of Environment, Tsinghua University, Beijing 100084, China
国内会议
杭州
英文
80-87
2014-11-13（万方平台首次上网日期，不代表论文的发表时间）