生物脱氮除磷工艺厌氧/缺氧环境倒置效应

ENHANCEMENT OF NITPOGEN AND PHOSPHORUS REMOVAL BY REVERSAL OF ANAEROBIC AND ANOXIC ZONES SEQUENCE(7)

厌氧、缺氧环境是生物脱氮除磷工艺必不可少的重要组成部分，就该两种环境的先后顺序及其对工艺性能的影响进行机理研究。结果表明：常规工艺厌氧（Ａ１）／缺氧（Ａ２）／好氧（Ｏ）布置方式的合理性是值得再探讨的。把常规工艺的厌氧、缺氧环境倒置过来，即以缺氧（Ａ２）／厌氧（Ａ１）／好氧（Ｏ）方式运行可明显提高工艺的氮磷脱除效果。在同等条件下，Ａ２／Ａ１／Ｏ系统的出水Ｏｒｔｈｏ－Ｐ比常规Ａ１／Ａ２／Ｏ系统低５０％，而比反硝化速率却比后者高４０－５０％。

Anaerobic and anoxic zones are two essential parts in biological nitrogen and phosphorus removal processes.The effect of the two zones in different orders on the performance of the process was studied, which showed that, the rationality of the conventional sequential arrangement of anaerobic (A1)/anoxic(A2)/aerobic(0)was doubtful,and the effectiveness of nitrogen and phosphurus removal could be evidently enhanced when the order of anaerobic and anoxic zones was reversed and the system was operated in a A2/A1/0 patten.Under equivalent conversions,the effluent ortho P content of the system with A2/A1/0 was 50% lower than that of A1/A2/0, where as the specific rate of denitrification was 40～50% higher.