東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back to Search results for [ null ]

Switch To: Labeled | MARC Mode | ISBD

Transport and Biodegradation of Petr...

Escobar Melendez, Elsy.

Linked to FindBook

Google Book

Amazon

博客來

Transport and Biodegradation of Petroleum Hydrocarbon Vapors in the Subsurface. A Laboratory Soil Column Study.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Transport and Biodegradation of Petroleum Hydrocarbon Vapors in the Subsurface. A Laboratory Soil Column Study./
Author:	Escobar Melendez, Elsy.
Description:	272 p.
Notes:	Source: Dissertation Abstracts International, Volume: 73-08(E), Section: B.
Contained By:	Dissertation Abstracts International73-08B(E).
Subject:	Engineering, Environmental. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3505593
ISBN:	9781267300621

Transport and Biodegradation of Petroleum Hydrocarbon Vapors in the Subsurface. A Laboratory Soil Column Study.
Escobar Melendez, Elsy.

Transport and Biodegradation of Petroleum Hydrocarbon Vapors in the Subsurface. A Laboratory Soil Column Study. - 272 p.

Source: Dissertation Abstracts International, Volume: 73-08(E), Section: B.

Thesis (Ph.D.)--Arizona State University, 2012.

In this work, the vapor transport and aerobic bio-attenuation of compounds from a multi-component petroleum vapor mixture were studied for six idealized lithologies in 1.8-m tall laboratory soil columns. Columns representing different geological settings were prepared using 20--40 mesh sand (medium-grained) and 16-minus mesh crushed granite (fine-grained). The contaminant vapor source was a liquid composed of twelve petroleum hydrocarbons common in weathered gasoline. It was placed in a chamber at the bottom of each column and the vapors diffused upward through the soil to the top where they were swept away with humidified gas. The experiment was conducted in three phases: (i) nitrogen sweep gas; (ii) air sweep gas; (iii) vapor source concentrations decreased by ten times from the original concentrations and under air sweep gas. Oxygen, carbon dioxide and hydrocarbon concentrations were monitored over time. The data allowed determination of times to reach steady conditions, effluent mass emissions and concentration profiles. Times to reach near-steady conditions were consistent with theory and chemical-specific properties. First-order degradation rates were highest for straight-chain alkanes and aromatic hydrocarbons. Normalized effluent mass emissions were lower for lower source concentration and aerobic conditions. At the end of the study, soil core samples were taken every 6 in. Soil moisture content analyses showed that water had redistributed in the soil during the experiment. The soil at the bottom of the columns generally had higher moisture contents than initial values, and soil at the top had lower moisture contents. Profiles of the number of colony forming units of hydrocarbon-utilizing bacteria/g-soil indicated that the highest concentrations of degraders were located at the vertical intervals where maximum degradation activity was suggested by CO2 profiles. Finally, the near-steady conditions of each phase of the study were simulated using a three-dimensional transient numerical model. The model was fit to the Phase I data by adjusting soil properties, and then fit to Phase III data to obtain compound-specific first-order biodegradation rate constants ranging from 0.0 to 5.7x10 3 d-1.

ISBN: 9781267300621Subjects--Topical Terms:

783782
Engineering, Environmental.

Transport and Biodegradation of Petroleum Hydrocarbon Vapors in the Subsurface. A Laboratory Soil Column Study.
LDR:03165nam a2200289 4500 001 1958225
005 20140403140333.5
008 150210s2012 ||||||||||||||||| ||eng d
020 $a 9781267300621
035 $a (MiAaPQ)AAI3505593
035 $a AAI3505593
040 $a MiAaPQ $c MiAaPQ
100 1 $a Escobar Melendez, Elsy. $3 2093244
245 1 0 $a Transport and Biodegradation of Petroleum Hydrocarbon Vapors in the Subsurface. A Laboratory Soil Column Study.
300 $a 272 p.
500 $a Source: Dissertation Abstracts International, Volume: 73-08(E), Section: B.
500 $a Adviser: Paul C. Johnson.
502 $a Thesis (Ph.D.)--Arizona State University, 2012.
520 $a In this work, the vapor transport and aerobic bio-attenuation of compounds from a multi-component petroleum vapor mixture were studied for six idealized lithologies in 1.8-m tall laboratory soil columns. Columns representing different geological settings were prepared using 20--40 mesh sand (medium-grained) and 16-minus mesh crushed granite (fine-grained). The contaminant vapor source was a liquid composed of twelve petroleum hydrocarbons common in weathered gasoline. It was placed in a chamber at the bottom of each column and the vapors diffused upward through the soil to the top where they were swept away with humidified gas. The experiment was conducted in three phases: (i) nitrogen sweep gas; (ii) air sweep gas; (iii) vapor source concentrations decreased by ten times from the original concentrations and under air sweep gas. Oxygen, carbon dioxide and hydrocarbon concentrations were monitored over time. The data allowed determination of times to reach steady conditions, effluent mass emissions and concentration profiles. Times to reach near-steady conditions were consistent with theory and chemical-specific properties. First-order degradation rates were highest for straight-chain alkanes and aromatic hydrocarbons. Normalized effluent mass emissions were lower for lower source concentration and aerobic conditions. At the end of the study, soil core samples were taken every 6 in. Soil moisture content analyses showed that water had redistributed in the soil during the experiment. The soil at the bottom of the columns generally had higher moisture contents than initial values, and soil at the top had lower moisture contents. Profiles of the number of colony forming units of hydrocarbon-utilizing bacteria/g-soil indicated that the highest concentrations of degraders were located at the vertical intervals where maximum degradation activity was suggested by CO2 profiles. Finally, the near-steady conditions of each phase of the study were simulated using a three-dimensional transient numerical model. The model was fit to the Phase I data by adjusting soil properties, and then fit to Phase III data to obtain compound-specific first-order biodegradation rate constants ranging from 0.0 to 5.7x10 3 d-1.
590 $a School code: 0010.
650 4 $a Engineering, Environmental. $3 783782
650 4 $a Engineering, Petroleum. $3 1018448
650 4 $a Engineering, Chemical. $3 1018531
690 $a 0775
690 $a 0765
690 $a 0542
710 2 $a Arizona State University. $b Civil and Environmental Engineering. $3 1676561
773 0 $t Dissertation Abstracts International $g 73-08B(E).
790 $a 0010
791 $a Ph.D.
792 $a 2012
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3505593