序批式生物膜CANON工艺的运行与温度的影响

通过序批式生物膜反应器,研究了CANON工艺的运行规律,并研究了温度对CANON工艺的影响.研究发现,通过序批式生物膜反应器反应器可以成功实现CANON工艺,TN去除率可达到88.3%,TN去除负荷达到0.52kg/(m3·d).系统中的NO2--N变化规律可以分为浓度上升期,浓度稳定期与浓度下降期.pH值先降低后升高的拐点与DO突跃的拐点均可作为反应结束的指示参数,DO拐点比pH值拐点出现要提前.在26~35℃之间,可以获得较好的硝化效果与TN去除效果,温度降低到20℃时,厌氧氨氧化性能开始受到显著影响,造成反应器中大量NO2--N积累,而硝化效果在15℃才受到显著影响.反应器中厌氧氨氧化细菌的最适温度约为30℃.

Performance of CANON process in n sequencing batch biofilm reactor and influence of temperarure

Characteristics of CANON process in a laboratory-scale sequencing batch biofilm reactor were studied and effects of temperature on nitrogen removal performance were also examined. The total nitrogen removal rate of 88.3% and the total nitrogen removal load of 0.52kg N/(m3·d) of the reactor were achieved, which could prove that CANON process really occurred and prevailed in sequencing batch biofilm reactor. During a batch operation period, changes of nitrite concentration in the reactor could be separated into three phases: up phase, stationary phase and down phase. Although the break-point of DO curve appeared earlier than that of pH curve during a reaction period, both of the two break-points could indicate the termination of CANON reaction. When the liquor temperature was 26~35℃, the reactor showed excellent nitritation performance and most of total nitrogen was disappeared. When the liquor temperature was below 20 ℃, anaerobic ammonium oxidation reaction was inhibited seriously and resulted in a large amount of nitrite accumulation in the reactor. And nitritation reaction was inhibited seriously when the liquor temperature was below 15℃. The optimum temperature for anaerobic ammonium oxidation bacteria growth was about 30℃.