Advanced Water Management Centre, The University of Queensland, St. Lucia, Queensland 4072, Australia.
Water Res. 2010 Jul;44(14):4241-51. doi: 10.1016/j.watres.2010.05.030. Epub 2010 Jun 1.
Nitrite dosing is a promising technology to prevent sulfide and methane formation in sewers, due to the known inhibitory/toxic effect of nitrite on sulfate-reducing bacteria (SRB) and methanogenic Archaea (MA). The dependency of nitrite-induced inhibition on sulfide and methane producing activities of anaerobic sewer biofilms on nitrite levels and exposure time is investigated using a range of nitrite concentrations (40, 80, 120 mg-N/L) and exposure time up to 24 days. The recovery of these activities after the 24-day nitrite dosage was also monitored for more than two months. The inhibition level was found to be dependent on both nitrite concentration and exposure time, with stronger inhibition observed at higher nitrite concentrations and/or longer exposure time. However, the time required for achieving 50% recovery of both sulfate-reducing and methanogenic activities after the cessation of nitrite dosage only marginally depended on nitrite concentration. Model-based analysis of the recovery data showed that the recovery was likely due to the regrowth of SRB and methanogens. The lab studies and mathematical analysis supported the development of an intermittent dosing strategy, which was tested in a 1-km long rising main sewer. The field trial confirmed that intermittent dosing of nitrite can effectively reduce/prevent the formation of both sulfide and methane.
亚硝酸盐投加是一种很有前景的防止污水中硫化物和甲烷生成的技术，这是因为亚硝酸盐对硫酸盐还原菌 (SRB) 和产甲烷古菌 (MA) 具有已知的抑制/毒性作用。本研究采用一系列亚硝酸盐浓度（40、80、120 mg-N/L）和长达 24 天的暴露时间，研究了亚硝酸盐诱导抑制作用对厌氧污水生物膜中硫化物和甲烷产生活性的依赖关系。还监测了 24 天亚硝酸盐投加后的这些活性的恢复情况，持续时间超过两个月。结果发现，抑制水平既依赖于亚硝酸盐浓度，又依赖于暴露时间，在较高的亚硝酸盐浓度和/或较长的暴露时间下，观察到更强的抑制作用。然而，停止亚硝酸盐投加后，硫酸盐还原和产甲烷活性恢复到 50%所需的时间仅略微取决于亚硝酸盐浓度。基于模型的恢复数据分析表明，恢复可能是由于 SRB 和产甲烷菌的再生长所致。实验室研究和数学分析支持间歇性投加策略的开发，并在一条 1 公里长的上升式污水干管中进行了测试。现场试验证实，间歇性投加亚硝酸盐可以有效地减少/防止硫化物和甲烷的形成。
