摘要
双泥法中硝化单元的硝化效果对系统的反硝化除磷效能非常关键,为此通过中试研究了BAF作为A2N工艺硝化单元的处理效能。结果表明:BAF对COD的降解主要发生在进水端,在滤层0.4 m高度处COD即已降至68 mg/L,这有利于滤层上部对NH+4-N的去除。在无外加碱度的条件下,BAF适宜的气水比范围为(3∶1)^(5∶1),增加BAF进水的碱度可使NH+4-N的去除量提高10 mg/L以上,进而可降低气水比。A2N工艺中的BAF进水COD浓度低,且对出水SS指标无要求,这有利于延长BAF的反冲洗周期,试验中反冲洗周期达到7 d,反冲洗后BAF可迅速恢复硝化能力。以上研究结果证明,BAF能够与A2N工艺良好地结合并提高工艺的处理效能。
Denitrifying phosphorus removal performance in the A2N process is highly dependent on nitrification efficiency in the aerobic stage. A pilot-scale up-flow biological aerated filter （BAF） was em- ployed for nitrification in the A2N process, and its nitrification performance was investigated. The results showed that COD could be effectively reduced to 68 mg/L in the first 0.4 m height of BAF, which was beneficial to ammonia nitrogen removal in the upper part of BAF. The optimum air/water ratio ranged from （3 ： 1 ） to （5 ： 1 ） for BAF without external alkalinity. Ammonia nitrogen removal was increased by more than 10 mg/L with alkalinity addition, which could reduce the air/water ratio. The BAF backwash- ing interval was significantly prolonged to 7 d due to low COD in influent and no requirement for SS in ef- fluent. A quick performance recovery after backwashing was observed. The results indicate that the treat- ment efficiency can be improved by combining BAF with the A2 N process.
出处
《中国给水排水》
CAS
CSCD
北大核心
2013年第15期65-67,72,共4页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2008ZX07317-02)
关键词
双泥法
曝气生物滤池
硝化作用
two-sludge process
biological aerated filter
nitrification
