污水有机碳源特征及温度对反硝化聚磷的影响

The influence of carbon source and temperature on the denitrifying dephosphorus removal in wastewater treatment process

为考察A2N连续流系统的主导生化反应过程及聚磷污泥的诸多特性,从而为反硝化除磷脱氮新工艺的应用推广提供可供参考的运行控制参数,首次采用A2N系统中的反硝化聚磷污泥(DPB污泥),以生活污水、乙酸以及细胞内碳源作为有机底物,利用批量静态试验展开对比研究.结果表明,污水中的挥发性有机物含量越高,厌氧段初始的放磷速率越快,放磷越充分,后续反硝化脱氮和缺氧吸磷效果也将明显提高;而内源反硝化脱氮速率决定于细胞内PHB贮存量,当反硝化聚磷微生物细胞体内的PHB被耗尽,微生物处于极度饥饿状态,内源反硝化速率很低,同时也不发生吸磷反应.试验同时考察分析了2种温度条件———正常温度(25～26℃)和低温(8～10℃)下DPB的反硝化吸磷情况,发现反应系统在低温条件下将减小厌氧放磷和缺氧吸磷的生化反应速率,但并不对反硝化聚磷菌产生完全抑制作用,即低温对系统整体吸磷效果的负面影响不大.

To supply the valuable running parameters for the popular usage of the new denitrifying phosphors removal technique, it is necessary to study the dominant biological reaction and the characteristics of denitrifying phosphorus removal bacteria （DPB） in the denitrifying phosphors removal process. The parallel batch experiments using DPB sludge were carried out to study the effect of substrates （ sewage, HAe and internal carbon source） on denitrifying dephosphorus removal efficiency. The results showed that initial specific phosphorus release rate increased with the high concentration of the low-chain volatile fatty acids ration in influent, and sufficient phosphorus was released by DPB. That improved subsequent denitrification and phosphorus uptake efficiency. The specific endogenous denitrification mainly relies on the internal carbon source （PHB） contents stored by Poly-p bacteria. DPB was very hungry when the internal PHB consumed. Consequently, the specific endogenous denitrifieation rate was low and the phosphorus uptake did not happen. On the other hand, in the experiment, it was also investigated and analyzed the denitrifieation dephosphorus removal status under two kind temperature condition （ 8 - 10℃ and 25 - 26℃ ）. It was found that the lower temperature decreased the specific phosphorus release and uptake velocities, but did not do the negative effects on the overall phosphorus removal.