水力停留时间对厌氧反应器脱氮效果的影响

The impact of hydraulic retention time on an anaerobic reactor’s nitrogen removal effect

中文关键词: 厌氧反应器  脱氮效果  流速  水力停留时间  自然挂膜

英文关键词: Anaerobic reactor  Nitrogen removal effect  Flow rate  Hydraulic retention time  Naturally cultivating biofilm

中文摘要:

      本研究使用自主设计的厌氧反硝化器，以斜发沸石为填料，自然挂膜，与循环水养殖系统一级生物滤池串接，探索不同水力停留时间(HRT)下反应器的脱氮效果。结果显示，在实验过程中，反应器对无机氮(IN)、总氮(TN)均有较好的去除效果。在低水力停留时间(HRT<7.43 h)下，反应器主要去除的是氨氮(NH4+-N)；高水力停留时间下(HRT≥7.43 h)，反应器主要去除的是硝酸盐氮(NO3–-N)。当HRT为17.52 h时，反应器的脱氮效果最好，NO3–-N去除率为77.48%。此后，HRT延长，脱氮效果下降。脱氮效果越好，亚硝酸盐氮(NO2–-N)、NH4+-N积累越严重，NO2–-N最先开始积累。本研究可为厌氧反硝化装备的开发提供参考。

英文摘要:

      At present, domestic research on anaerobic denitrification is mostly at the laboratory stage. In order to develop highly efficient and suitable denitrification equipment for production, this study uses a self-designed anaerobic reactor with clinoptilolite as the filler, and naturally cultivated biofilm. By connecting the reactor to the primary biofilter of RAS, we aim to preliminarily investigate the reactor’s nitrogen removal effect under different hydraulic retention times (HRT), with a view to direct subsequent research. The results show that during the experiment, the reactor has a good removal effect on inorganic nitrogen (IN) and total nitrogen (TN). When the HRT is short (HRT<7.43 h), ammonium (NH4+-N) is the main form of nitrogen removed from the reactor, whereas with longer HRT (HRT≥7.43 h), nitrogen is removed as nitrate (NO3–-N). When the HRT is 17.52 h, the reactor’s nitrogen removal efficiency is the best, and the removal rate of NO3–-N reaches 77.48%. As HRT continues to extend, the nitrogen removal efficiency decreases. The better the nitrogen removal effect, the greater the accumulation of nitrite (NO2–) and ammonium, with the former accumulating first. Thus, this study can provide reference for the development of anaerobic denitrification equipment.