Effect of Free Cells and Additional Supporting Material on Performance of Polyethylene Glycol PEG-Pellet Reactor to Treat NH4-N Contaminated GroundwaterReportar como inadecuado




Effect of Free Cells and Additional Supporting Material on Performance of Polyethylene Glycol PEG-Pellet Reactor to Treat NH4-N Contaminated Groundwater - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

To study the effect of free cells suspended bacteria on performance of entrapped bacteria system i.e. polyethylene glycol PEG-pellet reactor to treat NH4-N contaminated groundwater, two PEG-pellet reactors with a lot of free cells - Reactor A containing PEG-pellet and Reactor B containing PEG-pellet and supporting material - and the another control reactor without free cells Reactor C were set-up. Three reactors were operated under various NH4-N concentrations 40-60 mg-L and various temperatures 5-25ºC. The results show that the free cells effected on the NH4-N removal efficiency significantly. The free cells developed to be a biofilm layer on the pellet surface for Reactor A, the biofilm layer caused the decreasing NH4-N diffusion and incomplete nitrification eventually. On the other hand, most free cells attached to the supporting material for Reactor B. Although the NH4-N could diffuse properly, the free cells consuming acetate caused the added acetate was insufficient for complete denitrification. However, the results suggest that the supporting material could reduce the effect of free cells on the reactor performance at low temperature as indicated by 1 higher efficiency and 2 lower activation energy Ea for nitrification and denitrification in Reactor B than Reactor A.

KEYWORDS

NH4-N removal, Nitrification and Denitrification, Groundwater Purification, Polyethylene Glycol PEG-Pellet, Supporting Material, Free Cells

Cite this paper

W. Khanitchaidecha, T. Sumino and F. Kazama -Effect of Free Cells and Additional Supporting Material on Performance of Polyethylene Glycol PEG-Pellet Reactor to Treat NH4-N Contaminated Groundwater,- Journal of Water Resource and Protection, Vol. 3 No. 1, 2011, pp. 12-21. doi: 10.4236-jwarp.2011.31002.





Autor: Wilawan Khanitchaidecha, Tatsuo Sumino, Futaba Kazama

Fuente: http://www.scirp.org/



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