吸磷过程中电子受体峰值浓度探讨  

Analysis of Peak Concentrations of Electron Acceptor During Phosphorus Uptaken Process

作　　者：彭赵旭[1] 彭永臻[1,2] 刘旭亮[1] 于振波[1] 柴同志[1] 

机构地区：[1]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 [2]北京工业大学环境与能源学院,北京100022

出　　处：《土木建筑与环境工程》2011年第4期162-166,共5页Journal of Civil,Architectural & Environment Engineering

基　　金：国家"十一.五"重大科技专项课题(2008ZX07317-007;2008ZX07209-003)

摘　　要：为了探讨NO3--N和DO分别作为吸磷过程电子受体时的峰值浓度,采用序批式间歇反应器(SBR)进行静态平行试验,在按照厌氧/好氧方式运行的EBPR系统中,分别考察了在NO3--N初始浓度为50 mg.L-1、75 mg.L-1和100 mg.L-1时以及曝气量为16 L.h-1、28 L.h-1和40L.h-1条件下的吸磷过程。结果表明,在内碳源充足的情况下,决定吸磷速率快慢的主要因素不是电子受体的浓度,而是能否及时地向系统中提供足够的电子受体。与DO相比,NO3--N作为吸磷过程电子受体时的效率偏低,且被反硝化掉的NO3--N量与被吸收的PO43--P量近似成正比。这说明采用厌氧/好氧方式运行的EBPR系统中也存在反硝化除磷菌,计算发现其占总聚磷菌的比例为17.70%。利用pH变化曲线作为吸磷过程的控制手段实用性不大,以NO3--N和DO作为吸磷过程电子受体的峰值浓度分别为50.00 mg.L-1和0.4 mg.L-1。In order to investigate the peak concentrations when NO3^--N and DO are regarded respectively as electron acceptors during phosphorus uptaken process, sequencing batch reactors （SBRs） are used to do parallel experiments. In an enhanced biological phosphorus removal （EBPR） system operated as anaerobic/ aerobic mode,phosphorus uptaken processes were investigated when NO3^--N concentration is 50 mg· L^-1, 75 mg · L 1,100 mg· L^-1 and aeration rate is 16 L· h^-1,28 L· h^-1,40 L · h^-1,respectively. The results show that, when internal carbon source is sufficient, the key factor to determine phosphorus uptaken rate is not the electron acceptor concentration, but whether sufficient electron acceptor can be supplied to the system timely. Compared with DO,NOa-N is a less efficient electron acceptor. Meanwhile, the amount of NO3^--N denitrified and the amount of PO4^3- P uptaken show a linear relationship, which means that the denitrification and phosphorus removal bacterias can exist in EBPR operated as anaerobic/ aerobic mode, and the calculation shows that its proportion can reach up to 17. 70% in the total phosphorus accumulating organisms （PAOs）. It is less practical to use pH variation curves as a strategy to control phosphorus uptaken process. The peak concentrations of NO;--N and DO as electron acceptor during phosphorus uptaken process are 50.00 mg· L^-1 and 0.4 mg· L^-1 ,respectively.

关 键 词：电子受体 溶解氧 吸磷速率 PH 

分 类 号：X703.1[环境科学与工程—环境工程]