不同污泥龄(SRT)对SNEDPR系统脱氮除磷影响  

Effect of Different Sludge Retention Time(SRT) Operations on the Nutrient Removal Characteristics of a SNEDPR System

作　　者：王晓霞 甄建园 赵骥[2] 于德爽 都叶奇 杜世明 袁梦飞 张帆 WANG Xiao-xia;ZHEN Jian-yuan;ZHAO Ji;YU De-shuang;DU Ye-qi;DU Shi-ming;YUAN Meng-fei;ZHANG Fan(School of Environmental Science and Engineering,Qingdao University,Qingdao 266071,China;National Engineering Laboratory of Urban Sewage Advanced Treatment and Resource Utilization Technology,Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]青岛大学环境科学与工程学院,青岛266071 [2]北京工业大学城市污水深度处理与资源化利用技术国家工程实验室北京市水质科学与水环境科学重点实验室,北京100124

出　　处：《环境科学》2019年第1期352-359,共8页Environmental Science

基　　金：国家自然科学基金项目(51778304;51708311);山东省自然科学基金项目(ZR2017BEE002);中国博士后科学基金项目(2017M612209)

摘　　要：为了解不同污泥龄(SRT)对同步硝化内源反硝化除磷(SNEDPR)系统脱氮除磷性能的影响,采用4组延时厌氧(180min)/低氧(溶解氧0.5~1.0 mg·L^(-1))运行的SBR反应器,以实际城市污水为处理对象,考察不同的SRT(5、10、15、25 d)条件下系统的脱氮除磷性能及其污泥性状的变化情况.结果表明,当SRT≥10 d时,短SRT有利于提高PAOs的竞争优势;在SRT为15 d和10 d时,系统除磷性能均较高,尤其是当SRT=10 d时,PPAOs,An平均为68.4%,PRA和PUA分别高达31.9mg·L^(-1)和34.3 mg·L^(-1).在SRT为15 d和10 d时,系统的硝化性能不受SRT变化的影响,且在SRT=15 d时,系统具有最高的脱氮性能,TN去除率和SNED率分别平均为89.6%和71.8%.在SRT≥10 d时,系统的COD去除性能不受SRT的变化影响,去除率达78%以上;但SRT=5 d时,由于系统生物量的流失使得系统对C、N、P的去除性能均较差,SNED率和PO3-4-P去除率分别低至5.7%和0.5%.此外,在SRT=15 d时,系统污泥沉降性能最好,SV和SVI分别为20%和64 mL·g^(-1),且污泥浓度随着SRT的延长而升高;长SRT(25 d)下系统抗冲击负荷能力较强,但污泥的沉降性能变差.This study focuses on the nitrogen (N) and phosphorus (P) removal characteristics in a simultaneous nitrification endogenous denitrification and phosphorus removal (SNEDPR) system operating at different sludge retention time (SRT). Four extended anaerobic/low aerobic (dissolved oxygen:0.5-1.0 mg·L^-1)-operated sequencing batch reactors (SBRs) fed with municipal sewage were studied at different SRT of 5, 10, 15, and 25 d. The experimental results show that a shorter SRT at an SRT ≥10 d enhances the competitive advantage of PAOs in the system and an efficient phosphorus removal performance of the SNEDPR system was achieved at a SRT of 10 d and 15 d. Especially at an SRT of 10 d;the average PPAOs, An was 68.4%, the PRA and PUA reached 31.9 and 34.3 mg·L^-1, respectively. The nitrification performance of the system was not affected by SRT changes. The most efficient nitrogen removal performance was achieved at a SRT of 15 d, with a high average TN removal and SNED efficiencies reaching 89.6% and 71.8%, respectively. At a SRT≥10 d, the COD removal performance of the SNEDPR system was also not affected by SRT changes. The COD removal efficiencies were higher than 78%. However, when the SRT was shortened to 5 d, the C, N, and P performances of the system worsened due to the loss of biomass;the SNED and PO4^3--P removal efficiencies were as low as 5.7% and 0.5%, respectively. In addition, at an SRT=15 d, the sludge-settling performance of the system was the best. The SV and SVI were 20% and 64 mL·g^-1, respectively, and the sludge concentration increased with the extension of the SRT. Under long SRT (25 d) operation, the system showed a good resistance to shock loads, but the sedimentation performance of the sludge deteriorated.

关 键 词：污泥龄(SRT) 同步硝化内源反硝化(SNED) 反硝聚磷菌(DPAOs) 反硝化聚糖菌(DGAOs) 反硝化除磷 

分 类 号：X703[环境科学与工程—环境工程]