Wang Ya-yi, Peng Yong-zhen, Yin Fang-fang, Li Jun, Zhang Yu-kun
State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
Huan Jing Ke Xue. 2008 Jun;29(6):1526-32.
The characteristics of denitrifying phosphorus removal in a lab-scale two-sludge anaerobic-anoxic/nitrification SBR (A2 NSBR) system were studied fed with domestic wastewater. The influence of some key operation parameters, like C/P, C/N, and HRT, were examined using parallel tests, pH, dissolved oxygen (DO) and redox potential (ORP) were monitored on line to validate whether they could be used as the control parameters for this denitrifying phosphorus removal process. Results indicated that P removal efficiency showed an increased trend on the whole with the increase of the C/P. When the influent C/P was greater than 19.39, good phosphorus removal efficiency was achieved. However, the phosphorus removal efficiency deteriorated once the influent C/P decreased less than 15.36. On the other hand, relatively good phosphorus removal efficiency could be maintained in the A2 NSBR system even at a low C/N ratio, though the denitrification efficiency decrease instead. It is also found that increasing the influent C/N increased the PHB amount stored by polyphosphate accumulating organisms (PAO) and therefore the ultimate denitrification and phosphorus removal efficiency were both improved. For an excessively high C/N, the incompletely reacted COD will be residual to anoxic stage. Thus, the pure denitrification reaction, which preferentially supports OHOs, becomes the dominant reaction. This decreases the amount of available electron acceptors for denitrifying polyphosphate accumulating organisms (DNPAOs) at the anoxic stage which eventually impacts the anoxic phosphorus removal capacity. In addition, since A2 NSBR has two completely independent SBR systems, it benefits to establish a process control system in terms of the parameters DO, ORP, and pH.
以生活污水为进水，研究了实验室规模的双污泥厌氧 - 缺氧/硝化SBR（A2 NSBR）系统中反硝化除磷的特性。通过平行试验考察了一些关键运行参数，如碳磷比（C/P）、碳氮比（C/N）和水力停留时间（HRT）的影响，在线监测pH值、溶解氧（DO）和氧化还原电位（ORP），以验证它们是否可作为该反硝化除磷过程的控制参数。结果表明，随着C/P的增加，磷去除效率总体呈上升趋势。当进水C/P大于19.39时，可实现良好的磷去除效率。然而，一旦进水C/P降至低于15.36，磷去除效率就会恶化。另一方面，即使在低C/N比下，A2 NSBR系统仍可保持相对较好的磷去除效率，不过反硝化效率会下降。还发现，增加进水C/N会增加聚磷菌（PAO）储存的聚羟基丁酸酯（PHB）量，因此最终的反硝化和磷去除效率均得到提高。对于过高的C/N，未完全反应的COD会残留到缺氧阶段。因此，优先支持好氧异养菌（OHOs）的纯反硝化反应成为主导反应。这减少了缺氧阶段反硝化聚磷菌（DNPAOs）可用的电子受体量，最终影响缺氧除磷能力。此外，由于A2 NSBR有两个完全独立的SBR系统，有利于根据DO、ORP和pH参数建立过程控制系统。
