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Nitrate and Phosphate Removal from D...

Kouanda, Abdoul Azis.

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Nitrate and Phosphate Removal from Denitrification Bioreactors using Woodchips, Steel Chips and Agricultural Residue Media.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Nitrate and Phosphate Removal from Denitrification Bioreactors using Woodchips, Steel Chips and Agricultural Residue Media./
作者:	Kouanda, Abdoul Azis.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	172 p.
附註:	Source: Dissertations Abstracts International, Volume: 82-12, Section: B.
Contained By:	Dissertations Abstracts International82-12B.
標題:	Environmental engineering. -
電子資源:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28492935
ISBN:	9798516055485

Nitrate and Phosphate Removal from Denitrification Bioreactors using Woodchips, Steel Chips and Agricultural Residue Media.
Kouanda, Abdoul Azis.

Nitrate and Phosphate Removal from Denitrification Bioreactors using Woodchips, Steel Chips and Agricultural Residue Media. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 172 p.

Source: Dissertations Abstracts International, Volume: 82-12, Section: B.

Thesis (Ph.D.)--South Dakota State University, 2021.

This item must not be sold to any third party vendors.

Nitrate and phosphate present in agricultural subsurface drainage water can impact surface water quality thus impacting the environment and human health by causing eutrophication and Methemoglobinemia in young infant. Biological denitrification and phosphate adsorption filters are treatments options that can help reduce nitrate and phosphate concentration from agricultural subsurface drainage before it can be discharged in surface water.The first objective of this dissertation was to determine the Michaelis-Menten kinetics model parameters for nitrate removal in bioreactors using the fresh, aged, and composted woodchips. The composted woodchips achieved a denitrification rate 2.4 times higher than the fresh woodchips which was in term achieved 2.9 times higher denitrification rate than the aged woodchips. Denitrification rates decreased at 5ºC compared to 22ºC for composted woodchips and fresh woodchips. The composted still performed better at low temperatures compared to fresh woodchips.The second objective was to determine the impact of different pairing configurations of woodchips and steel chips on nitrate and phosphate removal capacity and how the pairing configurations affect the DOC and iron leaching from the reactors. Three different reactors pairing configurations were evaluated in this project including woodchips followed by steel chips, steel chips followed by woodchips, and mixed woodchips/steel chips. The effect of low temperature (5℃) on phosphate removal capacity was studied. There was no statistical difference in nitrate and phosphate removed between all three reactors configurations.The third objective was to compare the long-term nitrate removal rates of agricultural residue media and woodchips. The zero order nitrate removal constants were determined for each material at different days of the experiment. The 13 months nitrate load reduction (g/m3/d) average were as follow corn cobs > corn stover > barley straw > woodchips. Corn cobs demonstrated constantly higher nitrate removal rates than other materials throughout the 13-months experiment.The fourth objective was to investigate the impact of woodchip pretreatments duration on nitrate removal efficiency using two types of woodchips. The different pretreatments used were solar, natural, and composted. The Solar treated woodchips exhibited higher nitrate removal throughout the 6 months experiments, followed by natural then composted and finally the raw woodchips.

ISBN: 9798516055485Subjects--Topical Terms:

548583
Environmental engineering.
Subjects--Index Terms:

Agricultural residual media

Nitrate and Phosphate Removal from Denitrification Bioreactors using Woodchips, Steel Chips and Agricultural Residue Media.
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300 $a 172 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-12, Section: B.
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520 $a Nitrate and phosphate present in agricultural subsurface drainage water can impact surface water quality thus impacting the environment and human health by causing eutrophication and Methemoglobinemia in young infant. Biological denitrification and phosphate adsorption filters are treatments options that can help reduce nitrate and phosphate concentration from agricultural subsurface drainage before it can be discharged in surface water.The first objective of this dissertation was to determine the Michaelis-Menten kinetics model parameters for nitrate removal in bioreactors using the fresh, aged, and composted woodchips. The composted woodchips achieved a denitrification rate 2.4 times higher than the fresh woodchips which was in term achieved 2.9 times higher denitrification rate than the aged woodchips. Denitrification rates decreased at 5ºC compared to 22ºC for composted woodchips and fresh woodchips. The composted still performed better at low temperatures compared to fresh woodchips.The second objective was to determine the impact of different pairing configurations of woodchips and steel chips on nitrate and phosphate removal capacity and how the pairing configurations affect the DOC and iron leaching from the reactors. Three different reactors pairing configurations were evaluated in this project including woodchips followed by steel chips, steel chips followed by woodchips, and mixed woodchips/steel chips. The effect of low temperature (5℃) on phosphate removal capacity was studied. There was no statistical difference in nitrate and phosphate removed between all three reactors configurations.The third objective was to compare the long-term nitrate removal rates of agricultural residue media and woodchips. The zero order nitrate removal constants were determined for each material at different days of the experiment. The 13 months nitrate load reduction (g/m3/d) average were as follow corn cobs > corn stover > barley straw > woodchips. Corn cobs demonstrated constantly higher nitrate removal rates than other materials throughout the 13-months experiment.The fourth objective was to investigate the impact of woodchip pretreatments duration on nitrate removal efficiency using two types of woodchips. The different pretreatments used were solar, natural, and composted. The Solar treated woodchips exhibited higher nitrate removal throughout the 6 months experiments, followed by natural then composted and finally the raw woodchips.
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653 $a Phosphate removal
653 $a Water resources
653 $a Woodchips
653 $a Denitrification
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