Inhibition of free ammonia to the granule-based enhanced biological phosphorus removal system and the recoverability
The inhibition of free ammonia (FA) to the granule-based enhanced biological phosphorus removal (EBPR) system and the recoverability from macro- to micro-scale were investigated in this study.FAwas found to seriously deteriorate the EBPR performance and sludge characteristic (settleability and morphology).The FA inhibitory threshold of 17.76 mg N L1 was established.Acclimation phenomenon took place when poly-phosphate accumulating organisms (PAOs) were exposed for long time to constant FAconcentration (8.88 mg N L1).The repressed polysaccharides excretion could lead to breaking the stability and integrity of the granules.Therefore,the reduced particle size and granule disintegration were observed.The molecular analysis revealed that FA had a significant influence on the microbial communities and FA inhibition may provide a competitive advantage to glycogen accumulating organisms(GAOs) over PAOs.Interestingly,the community composition was found irreversible by recovery (Dice coefficients,36.3%),although good EBPR performance was re-achieved.
Free ammonia Granule-based enhanced biological phosphorus removal system Microbial activity Microbial community structure Recoverability
Xiongliu Zheng Peide Sun Juqing Lou Jing Cai Yingqi Song Shenjing Yu Xuanyu Lu
School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, Chi School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, Chi
国内会议
杭州
英文
343-351
2014-11-13（万方平台首次上网日期，不代表论文的发表时间）