東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Long-term stabilization of arsenic-b...

Raghav, Madhumitha.

Linked to FindBook

Google Book

Amazon

博客來

Long-term stabilization of arsenic-bearing solid residuals under landfill conditions.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Long-term stabilization of arsenic-bearing solid residuals under landfill conditions./
Author:	Raghav, Madhumitha.
Description:	188 p.
Notes:	Source: Dissertation Abstracts International, Volume: 74-12(E), Section: B.
Contained By:	Dissertation Abstracts International74-12B(E).
Subject:	Engineering, Environmental. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3592768
ISBN:	9781303343155

Long-term stabilization of arsenic-bearing solid residuals under landfill conditions.
Raghav, Madhumitha.

Long-term stabilization of arsenic-bearing solid residuals under landfill conditions. - 188 p.

Source: Dissertation Abstracts International, Volume: 74-12(E), Section: B.

Thesis (Ph.D.)--The University of Arizona, 2013.

The maximum contaminant level (MCL) for arsenic in drinking water was reduced to 10 parts per billion in 2006 by the USEPA. As a result, approximately 10,000 tons of arsenic-bearing residuals (ABSRs) are estimated to be generated every year from water treatment processes. It has also been established that the standard Toxicity Characteristic Leaching Procedure (TCLP), underestimates arsenic leaching from ABSRs, particularly under mature, mixed solid waste landfill conditions. This makes it critical to investigate stabilization technologies that would ensure long-term stability of arsenic residuals after disposal.

ISBN: 9781303343155Subjects--Topical Terms:

783782
Engineering, Environmental.

Long-term stabilization of arsenic-bearing solid residuals under landfill conditions.
LDR:03522nam a2200325 4500 001 1967632
005 20141124080605.5
008 150210s2013 ||||||||||||||||| ||eng d
020 $a 9781303343155
035 $a (MiAaPQ)AAI3592768
035 $a AAI3592768
040 $a MiAaPQ $c MiAaPQ
100 1 $a Raghav, Madhumitha. $3 2104680
245 1 0 $a Long-term stabilization of arsenic-bearing solid residuals under landfill conditions.
300 $a 188 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-12(E), Section: B.
500 $a Adviser: Wendell P. Ela.
502 $a Thesis (Ph.D.)--The University of Arizona, 2013.
520 $a The maximum contaminant level (MCL) for arsenic in drinking water was reduced to 10 parts per billion in 2006 by the USEPA. As a result, approximately 10,000 tons of arsenic-bearing residuals (ABSRs) are estimated to be generated every year from water treatment processes. It has also been established that the standard Toxicity Characteristic Leaching Procedure (TCLP), underestimates arsenic leaching from ABSRs, particularly under mature, mixed solid waste landfill conditions. This makes it critical to investigate stabilization technologies that would ensure long-term stability of arsenic residuals after disposal.
520 $a Arsenic is ubiquitously associated with iron oxides in natural environments as well as water treatment residuals. Hence, knowledge of iron oxide transformations under landfill conditions is critical to understanding the fate and mobility of the associated arsenic. In this work, the effect of high local Fe(II) concentrations on ferrihydrite transformation pathways was studied. Magnetite was the sole transformation product in the presence of high local Fe(II) concentrations. In the absence of high Fe(II) concentrations, goethite was the major transformation product along with minor quantities of magnetite. These results have implications for arsenic mobility from ABSRs since goethite and magnetite have different arsenic sorption capacities and mechanisms.
520 $a Two technologies were investigated for the stabilization of ABSRs---Arsenic Crystallization Technology (ACT) and Microencapsulation. The strategy for ACT was to convert ABSRs into minerals with a high arsenic capacity and long-term stability under landfill conditions. Scorodite, arsenate hydroxyapatites, ferrous arsenate, arsenated schwertmannite, tooeleite and silica-amended tooeleite, were synthesized and evaluated for their potential to serve as arsenic sinks using TCLP and a simulated landfill leachate test. Ferrous arsenate type solids and arsenated schwertmannite showed most promise in terms of low arsenic leachability and favorable synthesis conditions.
520 $a Microencapsulation involved coating arsenic-loaded ferrihydrite with a mineral having high stability under landfill conditions. Based on results from a previous study, vivianite was investigated as a potential encapsulant for ABSRs. A modified version of the TCLP was used to evaluate the effectiveness of microencapsulation. Although vivianite did not prove to be a promising encapsulant, our efforts offer useful insights for the development of a successful microencapsulation technology for arsenic stabilization.
590 $a School code: 0009.
650 4 $a Engineering, Environmental. $3 783782
650 4 $a Environmental Sciences. $3 676987
650 4 $a Geochemistry. $3 539092
690 $a 0775
690 $a 0768
690 $a 0996
710 2 $a The University of Arizona. $b Environmental Engineering. $3 2104681
773 0 $t Dissertation Abstracts International $g 74-12B(E).
790 $a 0009
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3592768