不同磷浓度下生物除磷颗粒系统的COD需求  

COD Requirement for Biological Phosphorus Removal Granule System Under Different Phosphorus Concentrations

作　　者：李冬[1] 曹美忠 郭跃洲 梅宁 李帅 张杰[1,2] LI Dong;CAO Mei-zhong;GUO Yue-zhou;MEI Ning;LI Shuai;ZHANG Jie(Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, China;State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China)

机构地区：[1]北京工业大学水质科学与水环境恢复工程北京市重点实验室,北京100124 [2]哈尔滨工业大学城市水资源与水环境国家重点实验室,哈尔滨150090

出　　处：《环境科学》2018年第7期3247-3253,共7页Environmental Science

基　　金：北京市青年拔尖团队项目(2014000026833TD02)

摘　　要：本试验采用SBR反应器,接种成熟的生物除磷颗粒,通过分阶段改变进水中总磷(TP)和COD浓度,研究了不同磷浓度条件下COD负荷对生物除磷颗粒系统的影响,得出不同磷浓度下生物除磷颗粒系统具有良好性能所需最低COD浓度.结果表明,进水TP浓度为10 mg·L-1时,生物除磷颗粒系统维持良好性能所需最低COD浓度为175 mg·L-1,出水TP浓度在0.5mg·L-1以下,颗粒粒径和SVI分别为1 020μm和36 m L·g-1,PN和PS含量(以MLSS计)分别为78 mg·g^(-1)和39 mg·g^(-1),PN/PS较低,颗粒具有较好的结构和性能.进水TP浓度为6 mg·L-1时,生物除磷颗粒系统良好除磷性能所需最低COD浓度为150 mg·L-1,出水TP浓度在0.3 mg·L-1以下,颗粒粒径和SVI分别为960μm和35 m L·g-1,PN和PS含量分别为75 mg·g^(-1)和35 mg·g^(-1),PN/PS较低,颗粒具有较好的结构和性能.整个运行过程中,COD去除率在83%以上,出水COD浓度在25mg·L-1以下.在不同磷浓度条件下,随着进水COD浓度降低,微生物分泌PN和PS含量均减少,PN/PS增大,颗粒粒径减小,SVI增加,颗粒的结构和性能恶化.In this study,the effect of COD loading on a biological phosphorus removal granule system under different phosphorus concentrations was investigated by changing the concentration of total phosphorus（ TP） and COD in the influent. The lowest concentration of COD for good performance of the biological phosphorus removal system under different phosphorus concentrations was obtained. The results show that when the concentration of TP was 10 mg·L^-1 in the influent,the lowest concentration of COD for good performance of the biological phosphorus removal system was 175 mg·L^-1. The concentration of TP in the effluent was below 0. 5 mg·L^-1; the particle size and SVI were 1 020 μm and 36 mL·g^-1,respectively; and the contents of PN and PS（ by MLSS） were 78 mg·g^-1 and 39 mg·g^-1,respectively. Furthermore,the PN/PS was lower and the granules had good structure and performance. When the concentration of TP was 6 mg·L^-1 in the influent,the lowest concentration of COD for good performance of the biological phosphorus removal system was 150 mg·L^-1. The concentration of TP in the effluent was below 0. 3 mg·L^-1; the particle size and SVI were respectively 960 μm and 35 mL·g^-1; and the contents of PN and PS were 75 mg·g^-1 and 35 mg·g^-1,respectively. Moreover,the PN/PS was lower and the granules had good structure and performance. The removal efficiency of COD was above 83% and the concentration of COD in the effluent was below 25 mg·L^-1 throughout the operational process. Under different the influent phosphorus concentrations,the contents of PN and PS decreased,PN/PS increased,particle size decreased,SVI increased,and the structure and performance of the biological phosphorus removal granules deteriorated as the COD concentration decreased.

关 键 词：生物除磷颗粒 COD浓度 去除率 胞外聚合物 颗粒粒径 PN/PS 

分 类 号：X703.1[环境科学与工程—环境工程]