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

Chloramines in Water Reuse Scenarios...

Patton, Samuel Douglas.

Linked to FindBook

Google Book

Amazon

博客來

Chloramines in Water Reuse Scenarios: Impacts on Treatment and New Processes.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Chloramines in Water Reuse Scenarios: Impacts on Treatment and New Processes./
Author:	Patton, Samuel Douglas.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	210 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-08, Section: B.
Contained By:	Dissertations Abstracts International82-08B.
Subject:	Environmental engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27997868
ISBN:	9798569970667

Chloramines in Water Reuse Scenarios: Impacts on Treatment and New Processes.
Patton, Samuel Douglas.

Chloramines in Water Reuse Scenarios: Impacts on Treatment and New Processes. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 210 p.

Source: Dissertations Abstracts International, Volume: 82-08, Section: B.

Thesis (Ph.D.)--University of California, Riverside, 2020.

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

The growth of industry, agriculture and human populations puts additional strain on the supply of safe drinking water around the world. Climate change induced droughts and human activity contaminate existing water sources and worsen the supply. Increasingly, outlooks on water stress indicate that millions more people will be living in areas of intense water stress. In response to these pressures, direct and indirect potable reuse has come to the forefront. But potable reuse requires advanced water treatment systems (AWTS) in the form of membrane filtration and UV-based advanced oxidation processes (UV/AOPs). With AWTS, chloramines are introduced to reduce biofouling in membrane systems but also co-exist in the UV/AOP steps of treatment.The goal of this dissertation is to study the chemistry of chloramines and their impacts treatment efficiency. First, the photochemistry of monochloramine (NH2Cl) was studied. It was observed that its photolysis formed HO• and chlorine atom (Cl•) which could break down recalcitrant organic contaminants such as 1,4-dioxane (1,4-D). It was also found that upwards of 75% of 1,4-D removal was due to HO• in a UV/NH2Cl system. Further, it was determined that NH2• was ineffective at treating 1,4-D. Second, the impacts of oxidant mixing between chloramines and hydrogen peroxide (H2O2) was studied. It was determined that NH2Cl and dichloramine (NHCl2) both had similar mechanisms of action, forming Cl• and HO•. It was observed that NH2Cl was more efficient for 1,4-D removal. When mixed with H2O2, NH2Cl had negative impacts on 1,4-D removal by preventing H2O2 from absorbing photons and scavenging the radicals generated by H2O2. These results were replicated on the pilot and bench scale. Third, the mechanisms by which chloramines form, the breakpoint process could be exploited for organic contaminant removal. This process was shown to produce HO• and it was demonstrated that peroxynitrous acid was responsible. Lastly, the breakpoint process and chloramine photochemistry were combined in a new process which treated up to 30% of 1,4-D in 100 mJ/cm2 and over 50% at 1000 mJ/cm2. The outcomes of these projects allow engineers to design better AWTS and discovering a novel AOP for future applications.

ISBN: 9798569970667Subjects--Topical Terms:

548583
Environmental engineering.
Subjects--Index Terms:

Advanced Oxidation

Chloramines in Water Reuse Scenarios: Impacts on Treatment and New Processes.
LDR:03402nmm a2200361 4500 001 2282125
005 20211001100703.5
008 220723s2020 ||||||||||||||||| ||eng d
020 $a 9798569970667
035 $a (MiAaPQ)AAI27997868
035 $a AAI27997868
040 $a MiAaPQ $c MiAaPQ
100 1 $a Patton, Samuel Douglas. $3 3560883
245 1 0 $a Chloramines in Water Reuse Scenarios: Impacts on Treatment and New Processes.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 210 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-08, Section: B.
500 $a Advisor: Liu, Haizhou.
502 $a Thesis (Ph.D.)--University of California, Riverside, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a The growth of industry, agriculture and human populations puts additional strain on the supply of safe drinking water around the world. Climate change induced droughts and human activity contaminate existing water sources and worsen the supply. Increasingly, outlooks on water stress indicate that millions more people will be living in areas of intense water stress. In response to these pressures, direct and indirect potable reuse has come to the forefront. But potable reuse requires advanced water treatment systems (AWTS) in the form of membrane filtration and UV-based advanced oxidation processes (UV/AOPs). With AWTS, chloramines are introduced to reduce biofouling in membrane systems but also co-exist in the UV/AOP steps of treatment.The goal of this dissertation is to study the chemistry of chloramines and their impacts treatment efficiency. First, the photochemistry of monochloramine (NH2Cl) was studied. It was observed that its photolysis formed HO• and chlorine atom (Cl•) which could break down recalcitrant organic contaminants such as 1,4-dioxane (1,4-D). It was also found that upwards of 75% of 1,4-D removal was due to HO• in a UV/NH2Cl system. Further, it was determined that NH2• was ineffective at treating 1,4-D. Second, the impacts of oxidant mixing between chloramines and hydrogen peroxide (H2O2) was studied. It was determined that NH2Cl and dichloramine (NHCl2) both had similar mechanisms of action, forming Cl• and HO•. It was observed that NH2Cl was more efficient for 1,4-D removal. When mixed with H2O2, NH2Cl had negative impacts on 1,4-D removal by preventing H2O2 from absorbing photons and scavenging the radicals generated by H2O2. These results were replicated on the pilot and bench scale. Third, the mechanisms by which chloramines form, the breakpoint process could be exploited for organic contaminant removal. This process was shown to produce HO• and it was demonstrated that peroxynitrous acid was responsible. Lastly, the breakpoint process and chloramine photochemistry were combined in a new process which treated up to 30% of 1,4-D in 100 mJ/cm2 and over 50% at 1000 mJ/cm2. The outcomes of these projects allow engineers to design better AWTS and discovering a novel AOP for future applications.
590 $a School code: 0032.
650 4 $a Environmental engineering. $3 548583
650 4 $a Environmental health. $3 543032
650 4 $a Water resources management. $3 794747
653 $a Advanced Oxidation
653 $a Breakpoint Chlorination
653 $a Chloramine
653 $a UV/AOP
690 $a 0775
690 $a 0470
690 $a 0595
710 2 $a University of California, Riverside. $b Environmental Toxicology. $3 3278739
773 0 $t Dissertations Abstracts International $g 82-08B.
790 $a 0032
791 $a Ph.D.
792 $a 2020
793 $a English
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27997868