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改良UCT分段进水深度脱氮除磷工艺反硝化动力学性能

Keywords: 分段进水,反硝化动力学,碳源,电子供体,比反硝化速率

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Abstract:

采用序批试验研究了在T=(15±1)℃条件下以生活污水、污泥水解酸化上清液、乙酸钠、甲醇、乙醇和葡萄糖为电子供体的活性污泥的反硝化性能以及pH变化规律和动力学特性.结果表明,乙酸钠的比反硝化速率和比耗碳速率最高,分别为4.13mg/(g.h)和29.8mg/(g.h),但其反硝化能力最低.污泥水解酸化上清液的反硝化速率与乙酸钠相当.反硝化菌需经若干周期的驯化后才能适应甲醇和乙醇电子供体.当要求直接提高反硝化速率时,不宜选择甲醇和乙醇为碳源.而葡萄糖电子供体系统在前10~120min出现短暂的"ρ(NOx--N)还原停滞平台",当大分子葡萄糖糖酵解为小分子有机物后,反硝化过程才顺利进行,糖酵解过程是葡萄糖反硝化过程的限速步骤.此外,不同电子供体反硝化过程pH变化规律可以间接指示反硝化动力学特性,其缺氧异养菌产率系数为0.68~0.73.

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