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Ammonia removal in simulated aquacul...

Mosquera Cadiz, Tomas Santiago.

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Ammonia removal in simulated aquaculture wastewater by biofilm-covered zeolite.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Ammonia removal in simulated aquaculture wastewater by biofilm-covered zeolite./
作者:	Mosquera Cadiz, Tomas Santiago.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	95 p.
附註:	Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.
Contained By:	Dissertation Abstracts International78-04B(E).
標題:	Water resources management. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10165756
ISBN:	9781369201321

Ammonia removal in simulated aquaculture wastewater by biofilm-covered zeolite.
Mosquera Cadiz, Tomas Santiago.

Ammonia removal in simulated aquaculture wastewater by biofilm-covered zeolite. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 95 p.

Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.

Thesis (Ph.D.)--University of California, Davis, 2016.

A biofilm-covered zeolite reactor is studied for ammonia removal from a simulated aquaculture wastewater stream that can exhibit sudden increases in the level of ammonia. The zeolite in this study was fully characterized in terms of its ammonia sorption properties. Adsorption and desorption kinetics were described by pseudo-first order and pseudo-second order equations, respectively, whereas results from equilibrium experiments were best described by the Langmuir isotherm model. A culture of nitrifying biofilm was characterized in terms of its ammonia oxidation rate, which was best described by a zero to half order rate equation depending on the ammonia concentration in solution.

ISBN: 9781369201321Subjects--Topical Terms:

794747
Water resources management.

Ammonia removal in simulated aquaculture wastewater by biofilm-covered zeolite.
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500 $a Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.
500 $a Adviser: Raul H. Piedrahita.
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520 $a A biofilm-covered zeolite reactor is studied for ammonia removal from a simulated aquaculture wastewater stream that can exhibit sudden increases in the level of ammonia. The zeolite in this study was fully characterized in terms of its ammonia sorption properties. Adsorption and desorption kinetics were described by pseudo-first order and pseudo-second order equations, respectively, whereas results from equilibrium experiments were best described by the Langmuir isotherm model. A culture of nitrifying biofilm was characterized in terms of its ammonia oxidation rate, which was best described by a zero to half order rate equation depending on the ammonia concentration in solution.
520 $a The biofilm-covered zeolite was effective at dampening peaks of ammonia, and regenerating the zeolite by efficiently oxidizing the desorbed ammonia, allowing the reactor to be exposed to the same ammonia peak multiple times. Samples of biofilm-covered zeolite were used to seed a ten-column fluidized bed reactor which was then exposed to multiple peaks of ammonia in a continuous stream of simulated aquaculture wastewater. A discrepancy was observed when comparing the reactor performance to the predicted results using a numerical model as the reactor did not dampen peaks of ammonia as rapidly as the model predicted. It is postulated that the biofilm has a direct effect on the sorption rates of the zeolite that can ultimately block the access of ammonia ions to active sites located in the most inner pores.
520 $a Microbial communities were characterized in all columns of the reactor, before and after being exposed to multiple ammonia peaks in the influent. After such regime, the column reactor showed a shift in the distribution of Nitrosomonas and Nitrospira bacteria. A separate unit of biofilm-covered zeolite was also characterized in terms of microbial population, where Nitrospira was the predominant nitrifying bacteria identified. This unexpected finding can be related to recent publications reporting that Nitrospira bacteria are capable of oxidizing ammonia to nitrite, and ultimately nitrate.
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