+publisher:"University of North Carolina" +contributor:("Coronell, Orlando")

University of North Carolina

1. Galyean, Anne. Characterizing Silver Engineered Nanoparticles in a Natural Water: Analytical Considerations for Instrumental and Environmental Factors Using Asymmetric Flow Field Flow Fractionation.

Degree: Environmental Sciences and Engineering, 2015, University of North Carolina

URL: https://cdr.lib.unc.edu/record/uuid:0a8bcddd-4fe6-4ff0-b66d-8cee973e16d2

► With the likely release of engineered nanoparticles into the aquatic environment, developing appropriate analytical methods for occurrence surveys has become a priority. To this end,… (more)

▼ With the likely release of engineered nanoparticles into the aquatic environment, developing appropriate analytical methods for occurrence surveys has become a priority. To this end, a method towards the quantification of silver nanoparticles (AgNP) in lake water samples using asymmetric flow field flow fractionation (AF4) and inductively coupled plasma mass spectrometry (ICP-MS) is reported. Therefore, light scattering (LS) detection was used to develop an assessment metric to evaluate relative accuracy among AF4 separations. This assessment metric is applied to optimization of cross flow (Vx) protocols in AF4 separation interfaced with LS detection using mixtures of polystyrene beads. AF4 has several instrumental parameters that may have a direct effect on separation performance. A sensitivity analysis utilizing orthogonal factional factorial design and graphical analysis was applied to ascertain the relative importance of five AF4 primary/instrumental factor settings when analyzing synthetic freshwaters containing AgNPs. The most important and significant AF4 primary/instrumental factors were buffer concentration and Vx velocity, while the least impacting was Vx ramp time. Optimal settings were also generated for each of the factors within the range of settings explored. A parallel orthogonal fractional factorial design was employed to evaluate the effects of five environmental factors, or water quality characteristics, on the separation. None of these water quality characteristic effects or interactions were found to be significant. Finally, the developed methodology was applied towards AgNP quantitation in a natural lake water sample using AF4 followed by online inductively coupled plasma mass spectrometry (ICP-MS). The impacts of various AF4 system components and natural organic matter (NOM) on AgNP quantitation were explored. Isotope enriched Ag ions (Ag+) were used to identify Ag speciation following AF4 separation. Ag quantitation was achieved within 10% of a spiked “challenge” concentration of AgNP in lake water using the standard addition method to compensate for natural matrix and system complexity. Further investigations into potential Ag+-NOM and AgNP-NOM interactions were performed using fluorescence spectroscopy. The corresponding results suggest that these interactions affect the molar mass and physical conformation of the NOM particles in the sample. Advisors/Committee Members: Galyean, Anne, Weinberg, Howard, Vreeland, Wyatt, Leopold, Michael, Cory, Rose, Coronell, Orlando.

Subjects/Keywords: Chemistry, Analytic; Aquatic sciences; Environmental sciences; Gillings School of Global Public Health; Department of Environmental Sciences and Engineering

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APA (6^th Edition):

Galyean, A. (2015). Characterizing Silver Engineered Nanoparticles in a Natural Water: Analytical Considerations for Instrumental and Environmental Factors Using Asymmetric Flow Field Flow Fractionation. (Thesis). University of North Carolina. Retrieved from https://cdr.lib.unc.edu/record/uuid:0a8bcddd-4fe6-4ff0-b66d-8cee973e16d2

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Galyean, Anne. “Characterizing Silver Engineered Nanoparticles in a Natural Water: Analytical Considerations for Instrumental and Environmental Factors Using Asymmetric Flow Field Flow Fractionation.” 2015. Thesis, University of North Carolina. Accessed March 09, 2021. https://cdr.lib.unc.edu/record/uuid:0a8bcddd-4fe6-4ff0-b66d-8cee973e16d2.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Galyean, Anne. “Characterizing Silver Engineered Nanoparticles in a Natural Water: Analytical Considerations for Instrumental and Environmental Factors Using Asymmetric Flow Field Flow Fractionation.” 2015. Web. 09 Mar 2021.

Vancouver:

Galyean A. Characterizing Silver Engineered Nanoparticles in a Natural Water: Analytical Considerations for Instrumental and Environmental Factors Using Asymmetric Flow Field Flow Fractionation. [Internet] [Thesis]. University of North Carolina; 2015. [cited 2021 Mar 09]. Available from: https://cdr.lib.unc.edu/record/uuid:0a8bcddd-4fe6-4ff0-b66d-8cee973e16d2.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Galyean A. Characterizing Silver Engineered Nanoparticles in a Natural Water: Analytical Considerations for Instrumental and Environmental Factors Using Asymmetric Flow Field Flow Fractionation. [Thesis]. University of North Carolina; 2015. Available from: https://cdr.lib.unc.edu/record/uuid:0a8bcddd-4fe6-4ff0-b66d-8cee973e16d2

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of North Carolina

2. Jutaporn, Panitan. Relationship between organic fouling of polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes and the fluorescence signature of dissolved organic matter in raw and pretreated feed waters.

Degree: Environmental Sciences and Engineering, 2016, University of North Carolina

URL: https://cdr.lib.unc.edu/record/uuid:5f2cfcb2-c201-4b33-88c9-07e48adb50b0

► The overall objective of this study was to elucidate the relationship between the dissolved organic matter (DOM) fractions that cause ultrafiltration (UF) membrane fouling, those… (more)

▼ The overall objective of this study was to elucidate the relationship between the dissolved organic matter (DOM) fractions that cause ultrafiltration (UF) membrane fouling, those that are present in feed waters, and those that are removed by pretreatment processes across a range of water sources. To achieve this overall objective, the following specific objectives were pursued: (i) to investigate the relationship between DOM removal by various pretreatment processes and the associated UF fouling reduction; (ii) to evaluate whether fluorescence excitation-emission matrices (EEMs) can be used as a tool to predict the capability of a pretreatment process to reduce fouling; (iii) to evaluate whether EEM coupled with parallel factor (PARAFAC) analysis can be used as a predictor of fouling potential of feed waters. The pretreatment processes evaluated were coagulation (alum and ferric chloride), powder activated carbon (PAC) adsorption, chlorine pre-oxidation with sodium hypochlorite, and ion exchange by MIEX resin. Fouling tests were performed using a polyvinylidene fluoride (PVDF) hollow-fiber UF membrane and a group of eight water sources with a broad range of water qualities. The results and analyses support the following major conclusions: (i) microbial protein-like DOM is a more important contributor to fouling than terrestrial DOM, relative to their respective abundance in source waters; (ii) in terms of fouling reduction, alum and ferric chloride coagulation were the most effective pretreatment processes, MIEX was moderately effective, and PAC adsorption and chlorine pre-oxidation were the least effective; (iii) fouling reduction was strongly correlated with the reduction of microbial DOM in foulant layers; and (vi) the fluorescence of microbial DOM at excitation-emission coordinates of 250(280)/352 (nm/nm) was significantly correlated to the UF membrane fouling potential of a variety of water sources before and after a variety of pretreatment processes. Overall, pretreatments that are effective in removing protein-like DOM are well suited toward UF membrane fouling reduction. The high predictive power of EEM coupled with PARAFAC analysis suggests that they are an effective tool for quantifying the fouling potential of source waters. Advisors/Committee Members: Jutaporn, Panitan, Coronell, Orlando, Singer, Philip, Cory, Rose, Weinberg, Howard, Boyer, Trevor.

Subjects/Keywords: Gillings School of Global Public Health; Department of Environmental Sciences and Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jutaporn, P. (2016). Relationship between organic fouling of polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes and the fluorescence signature of dissolved organic matter in raw and pretreated feed waters. (Thesis). University of North Carolina. Retrieved from https://cdr.lib.unc.edu/record/uuid:5f2cfcb2-c201-4b33-88c9-07e48adb50b0

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jutaporn, Panitan. “Relationship between organic fouling of polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes and the fluorescence signature of dissolved organic matter in raw and pretreated feed waters.” 2016. Thesis, University of North Carolina. Accessed March 09, 2021. https://cdr.lib.unc.edu/record/uuid:5f2cfcb2-c201-4b33-88c9-07e48adb50b0.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jutaporn, Panitan. “Relationship between organic fouling of polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes and the fluorescence signature of dissolved organic matter in raw and pretreated feed waters.” 2016. Web. 09 Mar 2021.

Vancouver:

Jutaporn P. Relationship between organic fouling of polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes and the fluorescence signature of dissolved organic matter in raw and pretreated feed waters. [Internet] [Thesis]. University of North Carolina; 2016. [cited 2021 Mar 09]. Available from: https://cdr.lib.unc.edu/record/uuid:5f2cfcb2-c201-4b33-88c9-07e48adb50b0.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jutaporn P. Relationship between organic fouling of polyvinylidene fluoride (PVDF) ultrafiltration (UF) membranes and the fluorescence signature of dissolved organic matter in raw and pretreated feed waters. [Thesis]. University of North Carolina; 2016. Available from: https://cdr.lib.unc.edu/record/uuid:5f2cfcb2-c201-4b33-88c9-07e48adb50b0

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of North Carolina

3. Lin, Lin. Characterization of the Water Transport Properties of the Active Layers of Polyamide Reverse Osmosis and Nanofiltration Membranes.

Degree: Environmental Sciences and Engineering, 2015, University of North Carolina

URL: https://cdr.lib.unc.edu/record/uuid:8ead5fe9-6886-4daf-a5c3-79c7eac2c91b

► The overall objective of this study was to elucidate which parameter among water partitioning, water diffusion and active layer thickness accounts for the differences in… (more)

▼ The overall objective of this study was to elucidate which parameter among water partitioning, water diffusion and active layer thickness accounts for the differences in water permeability among polyamide reverse osmosis (RO) and nanofiltration (NF) membranes. To achieve this overall objective, the following specific objectives were pursued: (i) to identify appropriate methods (facile and accurate) for measuring active layer thickness in RO/NF membranes; (ii) to ascertain the existence of voids within the polyamide active layers of RO/NF membranes and develop methods to quantify void volume fraction in active layers; (iii) to measure the partition coefficient of water into membrane active layers, and calculate the diffusion coefficient of water in active layers based on measurements of membrane water permeability (A), active layer thickness (δ), and water partition coefficient (K); and (iv) to correlate membrane water permeability (A) to active layer thickness (δ), water partition coefficient (K) and water diffusion coefficient (D) for a group of polyamide RO/NF membranes with a broad range of performance levels. The following major conclusions were drawn through this dissertation: (i) atomic force microscopy (AFM), Rutherford backscattering spectrometry (RBS), quartz crystal microbalance (QCM), profilometry and ellipsometry produce consistent active layer thickness results among each other and likely provide the most accurate results of active layer thickness of RO/NF membranes; (ii) scanning electron microscopy (SEM) and transmission electron microscopy (TEM) likely overestimate active layer thickness; (iii) voids with sizes in the ≈10-100 nm range commonly exist in the active layers of RO/NF membranes, occupy a significant volume fraction of the active layers, and are filled with water when the membranes are in contact with water (e.g., when they are being used for water purification); (iii) among active layer thickness, water partition coefficient and water diffusion coefficient, the differences in water permeabilities among RO/NF membranes were mostly accounted for by the differences in the water diffusion coefficients in their active layers; (iv) the presence of the voids in the active layer increases the membrane water permeance; and (v) there was not a clear correlation between void volume fraction and water permeance, water partition coefficient or water diffusion coefficient. Advisors/Committee Members: Lin, Lin, Coronell, Orlando, Aitken, Michael, Characklis, Gregory, Clegg, Thomas, Dewan, Prasun, Lopez, Rene.

Subjects/Keywords: Environmental engineering; Environmental sciences; Gillings School of Global Public Health; Department of Environmental Sciences and Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lin, L. (2015). Characterization of the Water Transport Properties of the Active Layers of Polyamide Reverse Osmosis and Nanofiltration Membranes. (Thesis). University of North Carolina. Retrieved from https://cdr.lib.unc.edu/record/uuid:8ead5fe9-6886-4daf-a5c3-79c7eac2c91b

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lin, Lin. “Characterization of the Water Transport Properties of the Active Layers of Polyamide Reverse Osmosis and Nanofiltration Membranes.” 2015. Thesis, University of North Carolina. Accessed March 09, 2021. https://cdr.lib.unc.edu/record/uuid:8ead5fe9-6886-4daf-a5c3-79c7eac2c91b.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lin, Lin. “Characterization of the Water Transport Properties of the Active Layers of Polyamide Reverse Osmosis and Nanofiltration Membranes.” 2015. Web. 09 Mar 2021.

Vancouver:

Lin L. Characterization of the Water Transport Properties of the Active Layers of Polyamide Reverse Osmosis and Nanofiltration Membranes. [Internet] [Thesis]. University of North Carolina; 2015. [cited 2021 Mar 09]. Available from: https://cdr.lib.unc.edu/record/uuid:8ead5fe9-6886-4daf-a5c3-79c7eac2c91b.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lin L. Characterization of the Water Transport Properties of the Active Layers of Polyamide Reverse Osmosis and Nanofiltration Membranes. [Thesis]. University of North Carolina; 2015. Available from: https://cdr.lib.unc.edu/record/uuid:8ead5fe9-6886-4daf-a5c3-79c7eac2c91b

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of North Carolina

4. Soros, Ampai. Chitosan Coagulation for Household Water Treatment in Developing Countries.

Degree: Environmental Sciences and Engineering, 2015, University of North Carolina

URL: https://cdr.lib.unc.edu/record/uuid:270d0d48-12ea-4e42-ae83-0bc682f4c890

► Providing safe drinking water for underserved populations is still a challenge. Almost 800 million people around the world consume untreated or improperly treated water. Household… (more)

▼ Providing safe drinking water for underserved populations is still a challenge. Almost 800 million people around the world consume untreated or improperly treated water. Household water treatment is a critical and immediate intervention to provide safe drinking water where there are no improved sources of drinking water or water treatment systems do not function properly. The purpose of this research was to determine the efficacy of chitosan as a novel coagulant for water treatment in the home and determine whether characteristics of chitosan, especially molecular weight and degree of deacetylation, influence the performance of chitosan for removal of turbidity and microbes (bacteria and viruses) from water. Effects of water quality parameters such as pH, turbidity and salinity on chitosan coagulation efficacy were also evaluated. Zeta potential during coagulation and antimicrobial effects of chitosan in water were examined to give insight into potential mechanisms of chitosan action. The jar test method was used to evaluate the effects of chitosan characteristics on removal of turbidity and representative microbes (E. coli and bacteriophage MS2) from water. Overall, this research suggests that chitosan is an effective natural coagulant to use for household water treatment. Chitosan efficiently removed kaolinite or bentonite turbidity at low optimum chitosan dose of 3 mg/L. It also exhibited 3 -5 log10 removal of E. coli bacteria and bacteriophage MS2 at chitosan doses of 3-10 mg/L. The chief mechanisms of turbidity and microbial removal by chitosan include interparticle bridging and charge neutralization. The antimicrobial activity of chitosan appeared to play a minor role in microbial removal. Raw water qualities such as pH, salinity and turbidity had minimal effects on chitosan’s efficacy. Chitosans with intermediate molecular weight and high degree of deacetylation are the best candidates for turbidity and microbial removal, and there is a range of effective doses; chitosans exhibit high removal of turbidity and microbes, including bacteria and viruses, across a range of raw water qualities. Advisors/Committee Members: Soros, Ampai, Sobsey, Mark, Casanova, Lisa, Ball, Louise, Stewart, Jill, Coronell, Orlando.

Subjects/Keywords: Environmental health; Public health; Gillings School of Global Public Health; Department of Environmental Sciences and Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Soros, A. (2015). Chitosan Coagulation for Household Water Treatment in Developing Countries. (Thesis). University of North Carolina. Retrieved from https://cdr.lib.unc.edu/record/uuid:270d0d48-12ea-4e42-ae83-0bc682f4c890

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Soros, Ampai. “Chitosan Coagulation for Household Water Treatment in Developing Countries.” 2015. Thesis, University of North Carolina. Accessed March 09, 2021. https://cdr.lib.unc.edu/record/uuid:270d0d48-12ea-4e42-ae83-0bc682f4c890.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Soros, Ampai. “Chitosan Coagulation for Household Water Treatment in Developing Countries.” 2015. Web. 09 Mar 2021.

Vancouver:

Soros A. Chitosan Coagulation for Household Water Treatment in Developing Countries. [Internet] [Thesis]. University of North Carolina; 2015. [cited 2021 Mar 09]. Available from: https://cdr.lib.unc.edu/record/uuid:270d0d48-12ea-4e42-ae83-0bc682f4c890.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Soros A. Chitosan Coagulation for Household Water Treatment in Developing Countries. [Thesis]. University of North Carolina; 2015. Available from: https://cdr.lib.unc.edu/record/uuid:270d0d48-12ea-4e42-ae83-0bc682f4c890

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of North Carolina

5. Tapscott, Caroline. An Evaluation of Flow and Transport Properties for Hydraulic Fracturing Fluids in Porous Medium Systems.

Degree: Environmental Sciences and Engineering, 2015, University of North Carolina

URL: https://cdr.lib.unc.edu/record/uuid:d7d14af6-b0c4-438a-a0f3-84f0fcf6c42e

► Hydraulic fracturing, or fracking, is a technology being applied across the US to increase the permeability of shale deposits containing natural gas by injecting a… (more)

Subjects/Keywords: Environmental sciences; Gillings School of Global Public Health; Department of Environmental Sciences and Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tapscott, C. (2015). An Evaluation of Flow and Transport Properties for Hydraulic Fracturing Fluids in Porous Medium Systems. (Thesis). University of North Carolina. Retrieved from https://cdr.lib.unc.edu/record/uuid:d7d14af6-b0c4-438a-a0f3-84f0fcf6c42e

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tapscott, Caroline. “An Evaluation of Flow and Transport Properties for Hydraulic Fracturing Fluids in Porous Medium Systems.” 2015. Thesis, University of North Carolina. Accessed March 09, 2021. https://cdr.lib.unc.edu/record/uuid:d7d14af6-b0c4-438a-a0f3-84f0fcf6c42e.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tapscott, Caroline. “An Evaluation of Flow and Transport Properties for Hydraulic Fracturing Fluids in Porous Medium Systems.” 2015. Web. 09 Mar 2021.

Vancouver:

Tapscott C. An Evaluation of Flow and Transport Properties for Hydraulic Fracturing Fluids in Porous Medium Systems. [Internet] [Thesis]. University of North Carolina; 2015. [cited 2021 Mar 09]. Available from: https://cdr.lib.unc.edu/record/uuid:d7d14af6-b0c4-438a-a0f3-84f0fcf6c42e.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tapscott C. An Evaluation of Flow and Transport Properties for Hydraulic Fracturing Fluids in Porous Medium Systems. [Thesis]. University of North Carolina; 2015. Available from: https://cdr.lib.unc.edu/record/uuid:d7d14af6-b0c4-438a-a0f3-84f0fcf6c42e

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of North Carolina

6. Wang, Alice. Performance Evaluation of the Compartment Bag Test for E. coli in Drinking Water.

Degree: Environmental Sciences and Engineering, 2015, University of North Carolina

URL: https://cdr.lib.unc.edu/record/uuid:19800256-36f6-481d-aadf-5a852586fe3b

► Nearly 748 million people worldwide lack access to improved drinking water sources, putting them at risk for waterborne illnesses. Fecal contamination of drinking water is… (more)

▼ Nearly 748 million people worldwide lack access to improved drinking water sources, putting them at risk for waterborne illnesses. Fecal contamination of drinking water is one of the largest contributors to the 1.8 million deaths per year from diarrheal disease. Because many countries lack active monitoring of drinking water quality, it is often unknown if consumed waters are safe. Current microbial monitoring methods typically require the use of specialized equipment, electricity, and trained personnel. However, in low-resource settings, these capacities are often unavailable. Therefore, there is a need for a low-cost, portable, and simple method for determining the microbial quality of drinking water in low-resource settings. The drawbacks of current water tests based on fecal indicator bacteria may be overcome using the Compartment Bag Test (CBT), a novel microbial water quality test innovated at the University of North Carolina at Chapel Hill. The CBT uses a simple design of a clear, chambered plastic bag with various compartment volumes totaling 100 mL to determine a Most Probable Number (MPN) estimate of Escherichia coli bacteria concentration using a chromogenic liquid medium. This semi-quantitative method could provide actionable results to identify microbially unsafe water and decrease microbial water quality health risks, if its performance is further documented against standard tests under a variety of use conditions. The goal of this research is to evaluate and document the performance of the CBT. A laboratory evaluation was conducted to explore the use of CBT to detect E. coli compared to a standard test using the Colilert medium in Quanti-Trays at various incubation temperatures. The CBT was also evaluated in field settings by incorporating the CBT in Demographic Health Surveys in Peru and Liberia. Household surveys were conducted in Tanzania to evaluate the CBT as a health behavior and education tool. Overall these studies demonstrate that 1) the CBT detects and quantifies E. coli comparable to standard methods, 2) incubation temperature between 27°C to 44°C provide comparable E. coli MPN results, 3) the CBT can be utilized in low resource settings and incorporated within national health surveys, and 4) the use of the CBT as a health behavior and education tool can influence perception and knowledge of microbial water quality of household users. Advisors/Committee Members: Wang, Alice, Sobsey, Mark, Stewart, Jill, Coronell, Orlando, Emch, Michael, Horney, Jennifer.

Subjects/Keywords: Microbiology; Environmental health; Public health; Gillings School of Global Public Health; Department of Environmental Sciences and Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, A. (2015). Performance Evaluation of the Compartment Bag Test for E. coli in Drinking Water. (Thesis). University of North Carolina. Retrieved from https://cdr.lib.unc.edu/record/uuid:19800256-36f6-481d-aadf-5a852586fe3b

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang, Alice. “Performance Evaluation of the Compartment Bag Test for E. coli in Drinking Water.” 2015. Thesis, University of North Carolina. Accessed March 09, 2021. https://cdr.lib.unc.edu/record/uuid:19800256-36f6-481d-aadf-5a852586fe3b.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang, Alice. “Performance Evaluation of the Compartment Bag Test for E. coli in Drinking Water.” 2015. Web. 09 Mar 2021.

Vancouver:

Wang A. Performance Evaluation of the Compartment Bag Test for E. coli in Drinking Water. [Internet] [Thesis]. University of North Carolina; 2015. [cited 2021 Mar 09]. Available from: https://cdr.lib.unc.edu/record/uuid:19800256-36f6-481d-aadf-5a852586fe3b.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang A. Performance Evaluation of the Compartment Bag Test for E. coli in Drinking Water. [Thesis]. University of North Carolina; 2015. Available from: https://cdr.lib.unc.edu/record/uuid:19800256-36f6-481d-aadf-5a852586fe3b

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of North Carolina

7. Wang, Jingbo. CHARACTERIZATION OF THE SOLUTE TRANSPORT PROPERTIES OF THE ACTIVE LAYERS OF POLYAMIDE THIN FILM COMPOSITE MEMBRANES.

Degree: Environmental Sciences and Engineering, 2018, University of North Carolina

URL: https://cdr.lib.unc.edu/record/uuid:2c3e4214-4169-4961-a142-f7261ddc3a52

► Thin film composite (TFC) membranes with fully aromatic polyamide barriers (or “active layers”), which have the capability to remove a broad range of contaminants (e.g.,… (more)

▼ Thin film composite (TFC) membranes with fully aromatic polyamide barriers (or “active layers”), which have the capability to remove a broad range of contaminants (e.g., inorganic salts, small organics) from water, offer promising low-energy solutions for desalination and wastewater treatment. As effective and efficient as current membrane technologies are, there is always a continued need to expand and improve their capabilities with growing needs and applications. A fundamental understanding of the mechanism plays a crucial role in guiding intelligent membrane material modifications and process optimization. Aromatic polyamide TFC membranes can have similar physico-chemical properties but different performance in terms of contaminant removal rate (salt rejection, in the case of desalination) and it is not very well understood which membrane property(-ies) account for the differences in membrane performance. There is a need to understand what properties of polyamide active layers account for the differences in salt rejection among different membranes. Theory of salt transport through TFC membranes indicates that the three properties of active layers that affect their salt rejection are active layer thickness, salt partition coefficient and salt diffusion coefficient in active layers. Therefore, the overall objective of this study was to elucidate which parameter among thickness, salt partition, and salt diffusion coefficient accounts for the differences in rejection among polyamide TFC membranes. To achieve this overall objective, this study: (i) developed a method to measure salt partition coefficient from aqueous solution into polyamide active layer of TFC membranes; (ii) quantified the salt partition and diffusion coefficient inside polyamide active layers of TFC membranes with a broad range of performance levels; (iii) studied the correlation between salt rejection and thickness, salt partition and diffusion coefficient. From the results, it was concluded that (i) for all membranes, the partition coefficients of all inorganic salts and small acids obtained experimentally were lower than 1 the partition coefficient did not differ much among different TFC membranes; (ii) the differences in salt rejection observed among membranes are mainly due to the differences in both salt partition and diffusion coefficients in active layers. Advisors/Committee Members: Wang, Jingbo, Coronell, Orlando, Aitken, Michael, Couper, David, Lopez, Rene, Stewart, Jill.

Subjects/Keywords: Gillings School of Global Public Health; Department of Environmental Sciences and Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, J. (2018). CHARACTERIZATION OF THE SOLUTE TRANSPORT PROPERTIES OF THE ACTIVE LAYERS OF POLYAMIDE THIN FILM COMPOSITE MEMBRANES. (Thesis). University of North Carolina. Retrieved from https://cdr.lib.unc.edu/record/uuid:2c3e4214-4169-4961-a142-f7261ddc3a52

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang, Jingbo. “CHARACTERIZATION OF THE SOLUTE TRANSPORT PROPERTIES OF THE ACTIVE LAYERS OF POLYAMIDE THIN FILM COMPOSITE MEMBRANES.” 2018. Thesis, University of North Carolina. Accessed March 09, 2021. https://cdr.lib.unc.edu/record/uuid:2c3e4214-4169-4961-a142-f7261ddc3a52.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang, Jingbo. “CHARACTERIZATION OF THE SOLUTE TRANSPORT PROPERTIES OF THE ACTIVE LAYERS OF POLYAMIDE THIN FILM COMPOSITE MEMBRANES.” 2018. Web. 09 Mar 2021.

Vancouver:

Wang J. CHARACTERIZATION OF THE SOLUTE TRANSPORT PROPERTIES OF THE ACTIVE LAYERS OF POLYAMIDE THIN FILM COMPOSITE MEMBRANES. [Internet] [Thesis]. University of North Carolina; 2018. [cited 2021 Mar 09]. Available from: https://cdr.lib.unc.edu/record/uuid:2c3e4214-4169-4961-a142-f7261ddc3a52.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang J. CHARACTERIZATION OF THE SOLUTE TRANSPORT PROPERTIES OF THE ACTIVE LAYERS OF POLYAMIDE THIN FILM COMPOSITE MEMBRANES. [Thesis]. University of North Carolina; 2018. Available from: https://cdr.lib.unc.edu/record/uuid:2c3e4214-4169-4961-a142-f7261ddc3a52

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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Open Access Theses and Dissertations