کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6366616 1623101 2014 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ammonia removal in the carbon contactor of a hybrid membrane process
ترجمه فارسی عنوان
حذف آمونیاک در کنسانتره کربن یک فرآیند غشایی هیبرید
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


- Modeling adsorption onto PAC is essential to describe ammonia removal in the HMP.
- Optimized nitrification is crucial for complete ammonia removal.
- PAC age should be set high to favor nitrification and lower operating costs.
- PAC concentration is of marginal importance for ammonia removal on colonized PAC.
- Future work should consider the role of the accumulated suspended solids in HMPs.

The hybrid membrane process (HMP) coupling powdered activated carbon (PAC) and low-pressure membrane filtration is emerging as a promising new option to remove dissolved contaminants from drinking water. Yet, defining optimal HMP operating conditions has not been confirmed. In this study, ammonia removal occurring in the PAC contactor of an HMP was simulated at lab-scale. Kinetics were monitored using three PAC concentrations (1-5-10 g L−1), three PAC ages (0-10-60 days), two temperatures (7-22 °C), in ambient influent condition (100 μg N-NH4 L−1) as well as with a simulated peak pollution scenario (1000 μg N-NH4 L−1). The following conclusions were drawn: i) Using a colonized PAC in the HMP is essential to reach complete ammonia removal, ii) an older PAC offers a higher resilience to temperature decrease as well as lower operating costs; ii) PAC concentration inside the HMP reactor is not a key operating parameter as under the conditions tested, PAC colonization was not limited by the available surface; iii) ammonia flux limited biomass growth and iv) hydraulic retention time was a critical parameter. In the case of a peak pollution, the process was most probably phosphate-limited but a mixed adsorption/nitrification still allowed reaching a 50% ammonia removal. Finally, a kinetic model based on these experiments is proposed to predict ammonia removal occurring in the PAC reactor of the HMP. The model determines the relative importance of the adsorption and biological oxidation of ammonia on colonized PAC, and demonstrates the combined role of nitrification and residual adsorption capacity of colonized PAC.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 67, 15 December 2014, Pages 255-266
نویسندگان
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