کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4483378 1316886 2011 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Performance and biofilm activity of nitrifying biofilters removing trihalomethanes
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Performance and biofilm activity of nitrifying biofilters removing trihalomethanes
چکیده انگلیسی

Nitrifying biofilters seeded with three different mixed-culture sources removed trichloromethane (TCM) and dibromochloromethane (DBCM) with removals reaching 18% for TCM and 75% for DBCM. In addition, resuspended biofilm removed TCM, bromodichloromethane (BDCM), DBCM, and tribromomethane (TBM) in backwash batch kinetic tests, demonstrating that the biofilters contained organisms capable of biotransforming the four regulated trihalomethanes (THMs) commonly found in treated drinking water. Upon the initial and subsequent increased TCM addition, total ammonia nitrogen (TOTNH3) removal decreased and then reestablished, indicating an adjustment by the biofilm bacteria. In addition, changes in DBCM removal indicated a change in activity related to DBCM. The backwash batch kinetic tests provided a useful tool to evaluate the biofilm’s bacteria. Based on these experiments, the biofilters contained bacteria with similar THM removal kinetics to those seen in previous batch kinetic experiments. Overall, performance or selection does not seem based specifically on nutrients, source water, or source cultures and most likely results from THM product toxicity, and the use of GAC media appeared to offer benefits over anthracite for biofilter stability and long-term performance, although the reasons for this advantage are not apparent based on research to date.

Research highlights
► Nitrifying biofilters removed TCM (up to 18%) and DBCM (up to 75%).
► Biofilter THM kinetics were similar to previous batch kinetic experiments.
► GAC appeared to offer benefits over anthracite (stability and performance).
► Biofilter backwash material biotransformed the four regulated trihalomethanes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 45, Issue 4, February 2011, Pages 1669–1680
نویسندگان
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