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Inactivation of Ammonia Oxidizing Bacteria By Chlorine and Monochloramine 氯和一氯胺对氨氧化细菌的灭活作用
发布日期: 2007-03-01
本幻灯片概述了一项关于测量氨氧化细菌失活动力学的研究 (AOB)实验室规模的欧洲亚硝基单胞菌 在氯和水存在下的实验 一氯胺, 生成CT值, 比较大肠杆菌CT值,探讨AOB在大肠杆菌中的消毒动力学 腐蚀碎屑、土壤物质的存在, 以及废水,将这些结果与 在纯水中获得的动力学。报告中概述了一项实验室规模的研究,得出以下结论:在纯水中,使用游离氯会产生6 CT值为1.3时AOB失活日志 mg。最小/升; 一氯胺在室温下产生4个AOB失活日志 CT值为10.5毫克。最小/升; 研究了AOB的一氯胺失活动力学 与大肠杆菌相似,但AOB比大肠杆菌更耐氯;和 腐蚀碎屑、土壤材料和废水已被清除 没有统计学意义(p<0.05)的影响 灭活AOB。第二项研究概述了以下目标: 在中试规模,在现场监控AOB 各种消毒剂和水源 质量条件, 不同比紫外线吸收率(SUVA)和 溴水平;和 通过使用 MPN培养方法(培养25至30天) 培养)和分子方法(amoA的PCR扩增) 基因)。研究2的结论包括: 试验阶段使用(高)0.8毫克/升溴,(高)>3.16升 mg-1 m-1 SUVA是唯一检测到HPC的药物 在所有处理装置的出水处; 天然有机物(NOM)、溴化物和微生物对氯的竞争 灭活可能影响消毒; 然而,MPN培养也没有检测到AOB 任何阶段的技术或分子方法; 亚硝酸盐浓度较低,表明硝化作用确实存在 在整个测试期间不会发生,与模拟配电系统中没有AOB一致; 适当的处理可以防止分配系统中的硝化作用;和 低HPC表明没有AOB。包括表格、数字。
This slide presentation outlines a study on measuring the inactivation kinetics of the ammonia oxidizing bacteria (AOB) Nitrosomonas europaea in bench-scale experiments in the presence of chlorine and monochloramine, generate CT values, compare to E. coli CT value, and explore the disinfection kinetics of AOB in the presence of corrosion debris, soil material, and wastewater, comparing those results to the kinetics obtained in pure water. A bench scale study is outlined in the presentation that had the following conclusions: in pure water, the use of free chlorine produced 6 logs of AOB inactivation at a CT value of 1.3 mg.min/L; monochloramine yielded 4 logs of AOB inactivation at a CT value of 10.5 mg.min/L; the monochloramine inactivation kinetics of AOB are similar to those of E. coli, but AOB are more resistant to chlorine than E. coli; and, corrosion debris, soil material, and wastewater had no statistically significant (p<0.05) impact on the inactivation AOB. A second study is outlined with the objectives of: at pilot-scale, monitoring AOB in the presence of various disinfectants and source water quality conditions, varying specific ultraviolet absorbance (SUVA) and bromide levels; and, monitoring AOB levels at pilot-scale by using the MPN cultivation method (25 to 30 days of incubation) and a molecular method (PCR amplification of the amoA gene). Study 2 conclusions included: the testing phase with (high) 0.8-mg/L bromide, (high) >3.16 L mg-1 m-1 SUVA is the only one during which HPC were detected at the effluent of all treatment trains; competition for chlorine between natural organic matter (NOM), bromide and microbial inactivation may have affected disinfection; however, AOB were not detected either by the MPN culture technique or the molecular method in any of the phases; nitrite concentrations were low, suggesting that nitrification did not occur over the entire testing period, consistent with the absence of AOB in the simulated distribution systems; adequate treatment prevents nitrification in distribution systems; and, low HPCs suggest absence of AOBs. Includes tables, figures.
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发布单位或类别: 美国-美国给水工程协会
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