Enhancement of simultaneous nitrogen and phosphorus removal using intermittent aeration mechanism  

作　　者：Parnian Izadi Parin Izadi Ahmed Eldyasti 

机构地区：[1]Civil engineering,York university,4700 Keele St,Toronto,ON,Canada

出　　处：《Journal of Environmental Sciences》2021年第11期1-14,共14页环境科学学报（英文版）

基　　金：The authors thank York University and NSERC for providing funding and technical support

摘　　要：Biological nutrient removal grows into complicated scenario due to the microbial consortium shift and kinetic competition between phosphorus(P)-accumulating and nitrogen(N)-removing microorganisms.In this study,three sequential batch reactors with constant operational conditions except aeration patterns at 6 h cycle periods were tested.Intermittent aeration was applied to develop a robust nutrient removal system aimed to achieve high energy saving and removal efficiency.The results showed higher correspondence of Puptake,polymeric substance synthesis and glycogen degradation in intermittent-aeration with longer interval periods compared to continuous-aeration.Increasing the intermittentaeration duration from 25 to 50 min,resulted in higher process performance where the system exhibited approximately 30%higher nutrient removal.This study indicated that nutrient removal strongly depends on reaction phase configuration representing the importance of aeration pattern.The microbial community examined the variation in abundance of bacterial groups in suspended sludge,where the 50 min intermittent aeration,favored the growth of P-accumulating organisms and nitrogen removalmicrobial groups,indicating the complications related to nutrient removal systems.Successful intermittently aerated process with high capability of simple implementation to conventional systems by elemental retrofitting,is applicable for upgrading wastewater treatment plants.With aeration as a major operational cost,this process is a promising approach to potentially remove nutrients in high competence,in distinction to optimizing cost-efficacy of the system.

关 键 词：EBPR Nutrient removal Intermittent aeration Dissolved oxygen PAO POLYHYDROXYALKANOATE 

分 类 号：X703[环境科学与工程—环境工程]