盐度对厌氧氨氧化工艺处理含海水污水脱氮特性的影响

采用ASBR厌氧氨氧化反应器,通过逐步提高所含海水比例,研究了厌氧氨氧化工艺处理含海水污水的脱氮特性.结果表明:经过一定时间的驯化后,厌氧氨氧化菌可以在各个海水比例下保持活性并维持较高的脱氮性能.当海水比例不高于40%时,反应器的稳定性和脱氮效能几乎不受盐度提升的影响,同时厌氧氨氧化菌的活性还会得到增强,比厌氧氨氧化活性(SAA)最高时的海水比例为30%,是10%海水比例时的121.3%;当海水比例高于40%时,反应器的脱氮效能开始下降,但经过一段时间的驯化后会得到恢复,在此期间反应器对海水盐度的响应可分为敏感期、过渡稳定期和恢复期3个阶段.在100%海水比例下,反应器的NRR可达0.341kgN/(m³·d),为10%海水比例时的73.7%,且其还有进一步提升的趋势.

Effects of salinity on nitrogen removal of treating sewage with seawater by ANAMMOX process

An anaerobic sequencing batch reactor (ASBR) was operated to investigate the nitrogen removal properties of ANAMMOX process treating sewage with seawater by gradually increasing seawater proportion. The results showed that ANAMMOX bacteria could remain active and maintain high nitrogen removal efficiency in any proportion of seawater through acclimation. When seawater proportion was not more than 40%, the seawater almost had no effect on the stability and the nitrogen removal efficiency of the reactor. Besides, the activity of ANAMMOX bacteria was enhanced. The maximum specific activity of ANAMMOX bacteria achieved in the reactor with 30% seawater, was 21.3% up compared with reactor containing 10% seawater. When seawater proportion was more than 40%, the nitrogen efficiency of reactor decreased. However, with sufficient time to adapt, the efficiency would recover. During this period, the reaction of the reactor could be divided into three phases: sensitive period, interim stable period and recovery period. When seawater proportion was 100%, the nitrogen removal rate of the reactor could be 0.341kgN/(m³·d), which was 73.7% of that contained 10% seawater, and the nitrogen removal capability had a further recovery trend.