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Membrane Selectivity and Fouling: Insights from Advanced Characterization Techniques
Membrane Selectivity and Fouling: Insights from Advanced Characterization Techniques
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260311091526.5
- ISBN
- 9798270230982
- DDC
- 660.284
- 저자명
- Nassr, Mostafa
- 서명/저자
- Membrane Selectivity and Fouling: Insights from Advanced Characterization Techniques / Mostafa Nassr
- 발행사항
- [Sl] : The University of Texas at Austin, 2025
- 형태사항
- 1 electronic resource (189 pages)
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisors: Lynd, Nathaniel A.; Freeman, Benny D. Committee members: Kumar, Manish; Katz, Lynn E.; Sanoja, Gaberial E.; Rosales, Adrianne M.
- 학위논문주기
- - Ph.D. : The University of Texas at Austin, 2025.
- 초록/해제
- 요약Membrane-based separations have emerged as efficient and low-cost methods for the treatment of complex wastewater streams. The efficient and effective use of membranes relies on their selectivity and resistance to fouling. The selectivity of porous membranes is typically characterized using solute rejection tests, where membranes are challenged with dilute aqueous solutions of neutral solutes. Since single solute methods are time-intensive, mixed solute tests have become more common. In this work, mixed solute filtration experiments showcased the presence of co-solute interactions, which increase with size and weight percent of large solutes in the mixture. Mixed solute filtration experiments at varying operating conditions were conducted to determine operating conditions that alleviate co-solute interactions. Low flux conditions can effectively minimize co-solute interactions, leading to pore size distributions that closely resemble results observed in ideal single solute filtrations. Laboratory fouling experiments are typically run such that the transmembrane pressure (TMP) is fixed, and the permeate flux decreases over time as fouling progresses. However, this change in flux means that the hydrodynamic conditions at the membrane surface are continuously changing, which affects fouling. Industrial filtrations may start at a constant TMP, but feed pressure may be periodically adjusted to maintain permeate production. In this work, the evolution of the fouling layer resistance due to scaling was investigated in both constant TMP and constant flux reverse osmosis (RO) crossflow filtration. It was determined that scaling in both operational modes is mechanistically different, where scaling in self-reinforcing and self-limiting under constant flux and constant TMP conditions, respectively. Membrane researchers use macroscopic performance metrics as an indicator of fouling (i.e. flux decline). However, this approach does not capture the membrane and fouling layer in their operational states, therefore potentially overlooking the true mechanisms of fouling. In this work, a remotely controlled crossflow membrane system and a custom membrane cell were designed and constructed for operando fouling characterization using synchrotron-based transmission small/wide X-ray scattering (SAXS/WAXS) measurements. The system's capability was demonstrated by examining nanoparticle fouling in ultrafiltration using SAXS and mineral scaling in RO using WAXS.
- 언어주기
- English
- 일반주제명
- Analytical chemistry
- 일반주제명
- Physical chemistry
- 일반주제명
- Polymer chemistry
- 키워드
- Reverse osmosis
- 키워드
- Solute rejection
- 키워드
- Porous membranes
- 기타저자
- The University of Texas at Austin Chemical Engineering
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260311s2025 us eng d■001000017361171
■00520260311091526.5
■006m o d
■007cr|nu||||||||
■020 ▼a9798270230982
■040 ▼aMiAaPQD▼beng▼cMiAaPQD▼erda
■082 ▼a660.284
■1001 ▼aNassr, Mostafa▼eauthor.
■24510▼aMembrane Selectivity and Fouling: Insights from Advanced Characterization Techniques ▼cMostafa Nassr
■260 ▼a[Sl]▼bThe University of Texas at Austin▼c2025
■264 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a1 electronic resource (189 pages)
■336 ▼atext▼btxt▼2rdacontent
■337 ▼acomputer▼bc▼2rdamedia
■338 ▼aonline resource▼bcr▼2rdacarrier
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisors: Lynd, Nathaniel A.; Freeman, Benny D. Committee members: Kumar, Manish; Katz, Lynn E.; Sanoja, Gaberial E.; Rosales, Adrianne M.
■5021 ▼bPh.D.▼cThe University of Texas at Austin▼d2025.
■520 ▼aMembrane-based separations have emerged as efficient and low-cost methods for the treatment of complex wastewater streams. The efficient and effective use of membranes relies on their selectivity and resistance to fouling. The selectivity of porous membranes is typically characterized using solute rejection tests, where membranes are challenged with dilute aqueous solutions of neutral solutes. Since single solute methods are time-intensive, mixed solute tests have become more common. In this work, mixed solute filtration experiments showcased the presence of co-solute interactions, which increase with size and weight percent of large solutes in the mixture. Mixed solute filtration experiments at varying operating conditions were conducted to determine operating conditions that alleviate co-solute interactions. Low flux conditions can effectively minimize co-solute interactions, leading to pore size distributions that closely resemble results observed in ideal single solute filtrations. Laboratory fouling experiments are typically run such that the transmembrane pressure (TMP) is fixed, and the permeate flux decreases over time as fouling progresses. However, this change in flux means that the hydrodynamic conditions at the membrane surface are continuously changing, which affects fouling. Industrial filtrations may start at a constant TMP, but feed pressure may be periodically adjusted to maintain permeate production. In this work, the evolution of the fouling layer resistance due to scaling was investigated in both constant TMP and constant flux reverse osmosis (RO) crossflow filtration. It was determined that scaling in both operational modes is mechanistically different, where scaling in self-reinforcing and self-limiting under constant flux and constant TMP conditions, respectively. Membrane researchers use macroscopic performance metrics as an indicator of fouling (i.e. flux decline). However, this approach does not capture the membrane and fouling layer in their operational states, therefore potentially overlooking the true mechanisms of fouling. In this work, a remotely controlled crossflow membrane system and a custom membrane cell were designed and constructed for operando fouling characterization using synchrotron-based transmission small/wide X-ray scattering (SAXS/WAXS) measurements. The system's capability was demonstrated by examining nanoparticle fouling in ultrafiltration using SAXS and mineral scaling in RO using WAXS.
■546 ▼aEnglish
■590 ▼aSchool code: 0227
■650 4▼aAnalytical chemistry
■650 4▼aPhysical chemistry
■650 4▼aPolymer chemistry
■653 ▼aMembrane-based separations
■653 ▼aTransmembrane pressure
■653 ▼aReverse osmosis
■653 ▼aSolute rejection
■653 ▼aPorous membranes
■7102 ▼aThe University of Texas at Austin▼bChemical Engineering.▼edegree granting institution.
■7201 ▼aLynd, Nathaniel A.▼edegree supervisor.
■7201 ▼aFreeman, Benny D.▼edegree supervisor.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17361171▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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