乙酸/丙酸作为EBPR碳源的动力学模型研究(Ⅲ)--模型的应用

Kinetic Model of Enhanced Biological Phosphorus Removal with Mixed Acetic and Propionic Acids as Carbon Sources(Ⅲ): Model Application

采用基于SCFAs代谢的动力学模型,模拟了不同碳源类型和不同m(P)/m(COD)对聚磷菌(PAO)和聚糖菌(GAO)竞争的影响.结果表明,以乙酸作为唯一碳源时,EBPR中的微生物种群结构基本保持反应器初始状态的生物组成,PAO或GAO都无法取得明显的竞争优势.但是,在进水中添加丙酸有利于PAO成为优势微生物,当丙酸占总酸的质量分数达到33%以上时,EBPR趋于稳定.当m(P)/m(COD)<0.01时,即使丙酸作为EBPR的碳源,GAO仍占(PAO+GAO)总量的95%以上.为了使PAO占有优势,进水m(P)/m(COD)应该控制在0.04～0.10之间.

The kinetic model based on SCFAs metabolism was applied for the prediction of phosphorus-and glycogen-accumulating organisms （PAO and GAO） competition with different carbon sources and m（P）/m（COD） ratios. When acetic acid was used as the sole carbon source, the biomass compositions were almost the same as those before cultivation, and neither PAO nor GAO could be out- competed from EBPR. However, increasing propionic acid in the influent helped PAO to be the predominance organism, and EBPR performance kept excellent when the ratio of propionate to mixed acids （ acetate ＋ propionate） was higher than O. 33. It also found that the m（ P）/m（COD） ratio should be kept at 0.04-0. 10 to avoid phosphorus became a limiting factor for PAO growth. This was because at low m （P）/m （COD） ratios, such as 0.01, GAO would take up 95% of the total （PAO ＋ GAO） biomass.