Advanced Water Management Centre, The University of Queensland, St. Lucia, Queensland 4072, Australia.
Water Res. 2011 Nov 15;45(18):6163-72. doi: 10.1016/j.watres.2011.09.009. Epub 2011 Sep 10.
Free nitrous acid (FNA) was previously demonstrated to be biocidal to anaerobic sewer biofilms. The intermittent dosing of FNA as a measure for controlling sulfide and methane productions in sewers is investigated. The impact of three key operational parameters namely the dosing concentration, dosing duration and dosing interval on the suppression and subsequent recovery of sulfide and methane production was examined experimentally using lab-scale sewer reactors. FNA as low as 0.26 mg-N/L was able to suppress sulfide production after an exposure of 12h. In comparison, 0.09 mg-N/L of FNA with 6-h exposure was adequate to restrain methanogenesis effectively. The recovery of sulfide production was well described by an exponential recovery equation. Model-based analysis revealed that 12-h dosage at an FNA concentration of 0.26 mg-N/L every 5 days can reduce the average sulfide production by >80%. Economic analysis showed that intermittent FNA dosage is potentially a cost-effective strategy for sulfide and methane control in sewers.
先前已经证明，游离亚硝酸（FNA）对厌氧污水生物膜具有杀菌作用。本研究考察了间歇投加 FNA 作为控制污水中硫化物和甲烷生成的措施。使用实验室规模的污水反应器进行了实验，研究了三个关键操作参数，即投加浓度、投加持续时间和投加间隔，对抑制和随后恢复硫化物和甲烷生成的影响。低至 0.26mg-N/L 的 FNA 在暴露 12 小时后即可抑制硫化物生成。相比之下，只需 0.09mg-N/L 的 FNA 暴露 6 小时即可有效抑制甲烷生成。硫化物生成的恢复可以很好地用指数恢复方程来描述。基于模型的分析表明，每隔 5 天以 0.26mg-N/L 的 FNA 浓度进行 12 小时投加，可将平均硫化物生成量减少>80%。经济分析表明，间歇投加 FNA 对于控制污水中的硫化物和甲烷生成具有潜在的成本效益。
