摘要
反硝化除磷工艺节约碳源,节省曝气量,同时减少剩余污泥产量,是一种低碳型污水脱氮除磷新技术。污水反硝化除磷最终通过排放剩余污泥来实现,设置合理的污泥停留时间(Sludge Retention Time,SRT)将影响系统的除磷效果,最终决定系统的运行稳定性和高效性。因此本研究有助于实现除磷工艺的优化,具有重大的工程意义。本实验设置序批式反应器(Sequencing Batch Reactor,SBR)反硝化除磷系统,系统研究了不同SRT(10 d、15 d、20 d、25 d和30 d)对反硝化除磷效果以及污泥特性的影响。结果显示,当SRT=15d时,磷去除率达到98.1%,系统除磷效果最佳;随着系统SRT的梯度增长,系统污泥产率依次为0.216 1mg VSS/mg COD、0.209 0mg VSS/mg COD、0.1894mg VSS/mg COD、0.170 5mg VSS/mg COD、0.140 3mg VSS/mg COD,逐渐降低;系统污泥磷含量依次为8.09%、8.43%、8.27%、7.92%、7.62%,总体成下降趋势;CST依次为3.54g/g SS、3.73g/g SS、2.39g/g SS、2.1g/g SS、1.71g/g SS,污泥脱水性能增强。试验表明SRT的变化影响系统除磷效果及污泥特性,为优化反硝化除磷技术提供理论依据。
The denitrification and phosphorus removal is a new technology for the removal of nitrogen and phosphorus in low carbon, which can save carbon source and aeration quantity, and reduce the production of excess sludge. Denitrifying phosphorus removal achieved by discharge of surplus sludge in wastewater treatment, setting up the reasonable sludge retention time （SRT） could affect the phosphorus removal system, uhimately determined the system stability and efficiency. So this research of the SRT＇s effect on the denitrification and phosphorus removal system played a significant role in realizing the optimization of phosphorus removal process. In this experiment, the effects of different SRT （10d, 15d, 20d, 25d and 30d） on the denitrifying phosphorus removal efficiency and the effect of the sludge characteristics was studied using a sequencing batch reactor （SBR） . The results showed that when the SRT was 15d, the phosphorus removal rate reached 98. 1%, and the biological phosphorus removal effect was optimum. When SRT extended from 10d- 30d, the sludge yield in the system were 0. 2161 rngVSS/mgCOD, 0. 2090 rngVSS/ mgCOD, 0. 1894 mgVSS/mgCOD, 0. 1705 mgVSS/rngCOD, 0. 1403 mgVSS/mgCOD, has gradually reduced, the phosphorus content in the sludge were successively 8. 09%, 8. 43% and 8. 27%, 7. 92% and 7. 62%, with overall reducing trend, CST were followed by 3. 54g/gSS, 3. 73g/gSS, 2. 39g/gSS, 2. lg/gSS, 1.71g/gSS and the performance for sludge dewatering performance had enhanced. The results of this study showed that the changes of SRT affected the effect of phosphorus removal and sludge characteristics, which had provided theoretical basis for optimizing the technology of denitrification and phosphorus removal.
出处
《四川环境》
2016年第6期45-51,共7页
Sichuan Environment
关键词
反硝化除磷
反硝化除磷菌
SBR
SRT
污泥特性
Denitrifying phosphorus removal
denitrifying phosphorus removal bacteria
sequencing batch reactor （SBR）
sludge retention time （SRT）
sludge characteristics
