کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4482347 1316856 2012 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evidence of soluble microbial products accelerating chloramine decay in nitrifying bulk water samples
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Evidence of soluble microbial products accelerating chloramine decay in nitrifying bulk water samples
چکیده انگلیسی

The discovery of a microbially derived soluble product that accelerates chloramine decay is described. Nitrifying bacteria are believed to be wholly responsible for rapid chloramine loss in drinking water systems. However, a recent investigation showed that an unidentified soluble agent significantly accelerated chloramine decay. The agent was suspected to be either natural organic matter (NOM) or soluble microbial products (SMPs). A laboratory scale reactor was fed chloraminated reverse osmosis (RO) treated water to eliminate the interference from NOM. Once nitrification had set in, experiments were conducted on the reactor and feed waters to determine the identity of the component. The study showed the presence of SMPs released by microbes in severely nitrified waters. Further experiments proved that the SMPs significantly accelerated chloramine decay, probably through catalytic reaction. Moreover, application of common protein denaturing techniques stopped the reaction implying that the compound responsible was likely to be a protein. This significant finding will pave the way for better control of chloramine in the distribution systems.

Graphical AbstractFigure optionsDownload high-quality image (148 K)Download as PowerPoint slideHighlights
► Soluble microbial products (SMPs) were present in severely nitrifying waters.
► The SMPs significantly accelerate chloramine decay through the catalytic reaction.
► Accelerated chloramine decay was associated with rapid ammonia and nitrite losses.
►  Application of protein denaturing techniques entirely stopped the accelerated decay.
► Compound responsible for accelerating chloramine decay could be protein or enzyme.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 46, Issue 13, 1 September 2012, Pages 3977–3988
نویسندگان
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