Engineering Commons^™

Stream Flow Analysis Of The Big Sioux River Just South Of Brookings, South Dakota, Samuel Ruppert

Electronic Theses and Dissertations

Floods are the most common type of natural disaster in the world and one of the most damaging. Changes in climate conditions such as precipitation and temperature are causing changes in stream flow. This means that in order to better understand flooding and possibly develop a system for making flood predictions, stream flow needs to be analyzed more closely. The primary objective of this thesis is to analyze the Big Sioux River just south of Brookings, South Dakota, both annually and seasonally. The United States Geological Survey (USGS) has stream gauges placed in rivers and streams all over the United …

Reliability Issues Caused By The Retirement Of Large Thermal Generation Facilities: An Irish Case Study, Kyle Lawson, Jane Courtney

Conference papers

Like all developed countries Ireland faces increasing pressure to reduce their carbon footprint. Part of the governments plans include the scaling back of fossil fuel generation facilities and increasing renewable resources. Moneypoint is Irelands only coal fired generation station. In 2025 Moneypoint is due to reach the end of its life cycle. At this point the Irish government will have to make a decission on the future of the generation facility. Currently Moneypoint is responsible for the generation of approximately 10 % of Irelands energy needs. In this paper, the removal of Moneypoint from the Irish generation portfolio will be …

Assessment Of Point Of Use (Pou) Systems For Reducing Health Risks Associated With Drinking Water Along The U.S.-Mexico Colonias In The Paso Del Norte Region, Varinia Viridiana Felix Parra

Open Access Theses & Dissertations

In the Paso del Norte Region along the U.S. Mexico Border, there are more than 5,000 families living in impoverished communities known as colonias that lack access to basic infrastructure services such as a public water system. These depend on hauling trucks that deliver water into their storage tanks. Water storage practices by colonia residents on both sides of the border pose an enormous risk for waterborne disease outbreaks and heavy metal contamination because the water quality can decrease rapidly due to volatilization of the residual chlorine, intrusion of rainfall and air-laden dust. Since connection to centralized water treatment and …

Assessment Of Physicochemical Characteristics, Thermal Stability And Release Profile Of Ascorbic Acid Microcapsules Obtained By Complex Coacervation, Michele Cristina Rodrigues Da Cruz, João Luiz Andreotti Dagostin, Camila Augusto Perussello, Maria Lúcia Masson

Articles

The aim of this study was to determine the physicochemical characteristics, thermal stability and release profile of ascorbic acid (AA) microcapsules obtained by complex coacervation. Gelatin and gum arabic were used as wall materials in concentrations of 2.5, 5.0 and 7.5 g% (w/v). The coacervate microcapsules were freeze-dried and assessed for physicochemical characteristics, thermal behavior and stability during 60 days of storage. The release profile was evaluated at different pH values (1.1, 2.2, 5.4, 7.4, 9.6 and 12). The encapsulation efficiency ranged from 27.3 to 93.8%. The microcapsules of AA presented good characteristics for application in food matrices, such as …

Harnessing Smart Technology For Private Well Risk Assessment And Communication, Tanner Hoffman, Paul Hynds, Corinne Schuster-Wallace, Sarah Dickson-Anderson, Anna Majury

Articles

Unregulated, privately owned water supplies, including groundwater wells, are relied upon extensively, particularly in rural and remote regions. While adequate stewardship behaviors (water testing, treatment, and maintenance) have been shown to decrease the incidence and frequency of faecal indicator organism (FIO) presence and, by extension, the risk of pathogenic ingress, contaminated private water supplies continue to constitute a significant public health risk. Recognizing that innovative approaches are needed to bolster well stewardship, this paper identifies and assesses 35 tools (smartphone and web-based applications) to better understand components, functionality, strengths, and weaknesses. Applications for both data collection and risk communication were …

Protein-Loaded Adsorbents To Address Aqueous Pfas Pollution, Faith Gonzalez

Summer Community of Scholars Posters (RCEU and HCR Combined Programs)

No abstract provided.

Pawnee Dam Inflow Design Flood (Idf) Update And Stage-Frequency Curve Development Using Rmcrfa, Jennifer P. Christensen, Joshua J. Melliger

United States Geological Survey: Water Reports and Publications

Pawnee Dam is one of the ten Salt Creek Dams designed and built in the 1960s to mitigate flooding in Lincoln, Nebraska. This short paper illustrates the update of the Pawnee Dam inflow design flood (IDF) through calibration to recent high flow events and the development of its stage-frequency or hydrologic loading curve with the U.S. Army Corps of Engineers’ Risk Management Center Reservoir Frequency Analysis (RMC-RFA) model. The IDF update follows Engineering Regulation 1110-8-2, Inflow Design Flood for Dams and Reservoirs, including unit hydrograph peaking and two antecedent pool elevations. Background information on the original design of the dam …

The Effect Of Edge-Of-Field Nutrient Management Practices On Microbial Concentrations In Subsurface Drainage Water And The Associated Risk Of Antibiotic Resistance Dissemination, Sara Mardani

Electronic Theses and Dissertations

Many in-field and edge-of-field management practices have been used to reduce nutrient loads from agricultural fields. The denitrification woodchip bioreactor (WB) is one edgeof- field management practice that has proven to be effective in removing nitrate from subsurface drainage water. The success in nitrate removal achieved with WBs has raised interest in expanding their capabilities for removing other agricultural pollutants, including phosphorus, by using other types of media like phosphorus-sorbing filters or combining these filters with woodchips to remove both nitrate and phosphorus as dual-nutrient removal systems. Despite the extensive research done on WBs and nutrient filter materials, little consideration …

Designing Bifunctional Materials For In-Situ Capture And Conversion Of Volatile Organic Compounds, Anirudh Krishnamurthy

Doctoral Dissertations

”Volatile organic compounds (VOCs) are a class of organic liquid compounds with low vapor pressures, which enables them to vaporize at ambient conditions. VOCs are largely toxic, carcinogenic, and mutagenic, and have profound adverse effects on human health and the ecological environment. Many VOCs cause ruinous health effects even at very low concentrations (ppm) and therefore control of these organic compounds is essential for ensuring good air quality. A large portion of VOCs cause catastrophic health effects such as cancer or liver damage even at very low concentrations (ppm), and the control of these compounds is vital in ensuring good …

Perceptions Of Vulnerability To Flooding, Hurricanes, And Climate Change On Grand Isle, Louisiana’S Only Inhabited Barrier Island, Lauren Miller

Graduate Student Theses, Dissertations, & Professional Papers

This study used in-depth interviews of permanent residents on Grand Isle, Louisiana, a remote barrier island, to better understand their perceptions of structural flood measures, non-structural responses to flooding and hurricanes, and perceptions of vulnerability to flooding, hurricanes, and climate change on a remote barrier island-Grand Isle, Louisiana. Residents' perceptions regarding the various structural measures implemented by the federal, state, and local government appeared mixed. Non-structural responses to flooding risks implemented at the household, community, state, and federal level continue to strengthen resiliency on Grand Isle. According to interviewees, aspects of environmental, rural, and economic vulnerability on Grand Isle impact …

Microemulsion Based Soil Remediation Using Mixed Anionic And Extended Nonionic Surfactant, Virin Kittithammavong

Chulalongkorn University Theses and Dissertations (Chula ETD)

The anionic-nonionic mixed system has a synergistic effect on the microemulsion formation by a reduction of interfacial tension. The challenge of the mixed surfactant based on soil remediation is how to find the appropriate condition. This study aims to investigate the phase behaviors of the anionic-nonionic mixed systems and to formulate their hydrophilic-lipophilic deviation (HLD) equations. Then the mixed surfactant solutions are applied to determine the oil removal efficiency. The conventional anionic surfactants (i.e., sodium dodecyl sulfate (SDS), sodium dihexyl sulfosuccinate (SDHS), and sodium dioctyl sulfosuccinate (AOT)) and the extended nonionic surfactants (i.e., alcohol ethoxylate series (AE(EOn) and alkyl polyglycol …

ทางเลือกการใช้ประโยชน์ก๊าซคาร์บอนไดออกไซด์เหลือทิ้ง กรณีศึกษาโรงงานอุตสาหกรรมปิโตรเคมี, ปิยวรรณ ศรทอง

Chulalongkorn University Theses and Dissertations (Chula ETD)

งานวิจัยมีวัตถุประสงค์เพื่อศึกษาแนวทางการใช้ประโยชน์ก๊าซคาร์บอนไดออกไซด์เหลือทิ้งจากโรงงานอุตสาหกรรมปิโตรเคมีตามหลักการเศรษฐกิจหมุนเวียน โดยทาการศึกษากระบวนการผลิตเอทิลีนออกไซด์ (Ethylene Oxide) ในส่วนของผลิตภัณฑ์โมโนเอทาโนลามีน (Monoethanolamine, MEA) และโมโนเอทิลีนไกลคอล (Monoethylene Glycol, MEG) และการจัดการก๊าซคาร์บอนไดออกไซด์ที่เกิดชึ้นจากกระบวนการผลิตในปัจจุบัน โดยพบว่าโรงงานมีการนำก๊าซคาร์บอนไดออกไซด์ที่เกิดขึ้นจากกระบวนการผลิตเอทิลีนออกไซด์ไปใช้ประโยชน์แล้ว แต่พบว่ายังมีบางส่วนที่ยังไม่ได้นำไปใช้ประโยชน์ ซึ่งจัดการโดยการปล่อยออกสู่บรรยากาศ แนวทางการนำก๊าซคาร์บอนไดออกไซด์ที่ดักจับได้ไปใช้ประโยชน์ (Carbon Dioxide Utilization) ระดับเชิงพาณิชย์ (Commercial scale) ในงานวิจัยนี้มีหลายวิธีได้แก่กระบวนการผลิตยูเรีย (urea) การสังเคราะห์กรดซาลิไซลิก (salicylic acids) กระบวนการผลิตเชื้อเพลิงชีวภาพ (biofuel) การสังเคราะห์โพลีออล (Polyol) และการนำก๊าซคาร์บอนไดออกไซด์มาสังเคราะห์เมทานอล (Renewable methanol) โดยนอกจากจะเป็นวิธีที่ลดปริมาณก๊าซคาร์บอนไดออกไซด์ในชั้นบรรยากาศแล้วยังเป็นการนำก๊าซคาร์บอนไดออกไซด์มาแปรรูป “สร้างมูลค่าเพิ่ม” หารายได้และสร้างเป็นธุรกิจใหม่ได้ จากนั้นทำการประเมินก๊าซเรือนกระจกที่ลดลงได้จากการใช้เทคโนโลยีทั้ง 3 ได้แก่ กระบวนการผลิตยูเรีย สังเคราะห์เมทานอลจากก๊าซคาร์บอนไดออกไซด์ และการใช้ก๊าซคาร์บอนไดออกไซด์เป็นองค์ประกอบเสริมที่เรียกว่า โพลิออล โดยทั้ง 3 เทคโนโลยีสามารถลดการปล่อยก๊าซคาร์บอนไดออกไซด์ที่จะปล่อยออกสู่บรรยากาศได้ ซึ่งเป็นแนวทางในการนำก๊าซคาร์บอนไดออกไซด์ไปใช้ประโยชน์ที่มีอยู่ในปัจจุบันและมีความน่าสนใจ แต่อย่างไรก็ตามควรวิเคราะห์ความคุ้มค่าทางเศรษฐศาสตร์และผลกระทบต่อสิ่งแวดล้อมในอนาคตเพิ่มเติมด้วย

การลดก๊าซเรือนกระจกจากการอนุรักษ์พลังงานและการจัดการขยะมูลฝอยของสถานศึกษา, นิภาพร เดโชเกียรติถวัลย์

Chulalongkorn University Theses and Dissertations (Chula ETD)

สถานศึกษาเป็นหน่วยงานขนาดใหญ่ที่ประกอบไปด้วยกิจกรรมที่มีความหลากหลาย จึงถือเป็นองค์กรที่สำคัญแห่งหนึ่งซึ่งมีการใช้พลังงานสูงทั้งในรูปพลังงานไฟฟ้าและเชื้อเพลิง นอกจากนี้ยังก่อให้เกิดขยะปริมาณมาก ซึ่งหมายถึงเป็นแหล่งของการปล่อยก๊าซเรือนกระจกสูงด้วย งานวิจัยนี้ได้ทำการประเมินคาร์บอนฟุตพริ้นท์องค์กรของสถานศึกษาพร้อมทั้งศึกษาแนวทางการลดการปล่อยก๊าซเรือนกระจกจากการอนุรักษ์พลังงงานและการจัดการขยะมูลฝอย ผลการศึกษาพบว่า ในปีพ.ศ. 2561 มหาวิทยาลัย ก มหาวิทยาลัย ข และวิทยาลัย ค มีปริมาณการปล่อยก๊าซเรือนกระจกทั้งหมดเท่ากับ 5,912.32 6,487.32 และ 1,458.05 ตันคาร์บอนไดออกไซด์เทียบเท่าต่อปี ตามลำดับ โดยการใช้พลังงานไฟฟ้าในขอบเขตที่ 2 และการกำจัดขยะในขอบเขตที่ 3 เป็นกิจกรรมที่ส่งผลต่อการปล่อยก๊าซเรือนกระจกมากที่สุดเป็นอันดับ 1 และ 2 ตามลำดับ มาตรการอนุรักษ์พลังงานซึ่งมีศักยภาพในการลดก๊าซเรือนกระจกและมีความคุ้มค่าทางเศรษฐศาสตร์ ได้แก่ มาตรการการเปลี่ยนไปใช้เครื่องปรับอากาศและเครื่องทำน้ำเย็นประสิทธิภาพสูง การติดตั้งอุปกรณ์ควบคุมความเร็วรอบเครื่องสูบน้ำเย็น การเปลี่ยนไปใช้หลอดไฟแบบ LED และการติดตั้ง Solar rooftop บนอาคาร นอกจากนี้การจัดการขยะมูลฝอยซึ่งมีประสิทธิภาพในการลดก๊าซเรือนกระจก สามารถทำได้โดยการจัดการขยะแบบผสมผสาน ได้แก่ การฝังกลบร่วมกับการคัดแยกขยะเพื่อการรีไซเคิล การนำเศษอาหารไปเป็นอาหารสัตว์ และการนำใบไม้มาทำสารปรับปรุงดิน

Tsunamigenic Potential Of The Baiyun Slide Complex In The South China Sea, Linlin Li, Fengyan Shi, Gangfeng Ma, Qiang Qiu

Civil & Environmental Engineering Faculty Publications

The Baiyun slide complex contains geological evidence for some of the largest landslide ever discovered in the continental slopes of the South China Sea. High-resolution seismic data suggest that a variety of landslides with varied scales have occurred repeatedly in this area. The largest landslide reconstructed from bathymetric and seismic data has an estimated spatial coverage of ~5,500 km² and a conservative volume of ~1,035 km³. Here, using geomorphological and geotechnical data, we construct a series of probable landslide scenarios and assess their tsunamigenic capacity. By treating the slides as deformable mudflows, we simulate the dynamics of …

Use Of Functionalized Bimetallic Membranes For Treatment Of Contaminated Groundwater At A Hazardous Waste Site In Kentucky, Lucy C. Pacholik

Theses and Dissertations--Civil Engineering

Providing access to clean drinking water will continue to be a challenge for civil engineers for generations to come. Since many communities around the world rely on groundwater as a source of drinking water, remediation technologies must be implemented at sites where groundwater contamination exists due to years of mismanagement of hazardous waste. Using nanosized zero-valent metals such as iron and zinc embedded within and on the surface of functionalized (PAA) membrane filters has shown to be an effective dechlorination technique for contaminated groundwater. Introducing a noble metal such as Pd or Ni increases reaction rates by acting a catalyst …

Pathway Connectivity In An Epigenetic Fluviokarst System: Insight From A Numerical Modelling Study In Kentucky Usa, Ethan Adams

Theses and Dissertations--Civil Engineering

Fluviokarst landscapes are dominated by both fluvial and karst features. Interpreting hydrologic pathways of fluviokarst can be confounded by the unknown connectivity of the various flow regimes. A combined discrete-continuum (CDC) hybrid numeric model for simulating the surface and subsurface hydrology and hydraulics in fluviokarst basins was formulated to investigate fluviokarst pathways. This model was applied to the Cane Run Royal Springs basin in Kentucky USA. A priori constraints on parameterization were avoided via multi-stage optimization utilizing Sobol sequencing and high performance computing. Modelling results provide evidence of hydrologic pathways dominated by fracture flow, epikarst transfer and runoff. Fractures in …

Decomposing A Watershed’S Nitrate Signal Using Spatial Sampling And Continuous Sensor Data, Evan Clare

Theses and Dissertations--Civil Engineering

Watershed features, physiographic setting, geology, climate, and hydrologic processes combine to produce a time-variant nutrient concentration signal at the watershed outlet. Anthropogenic influences, such as increased agricultural pressures and urbanization, have increased overall nutrient loadings delivered to the fluvial network. The impact of such increased nutrient loadings on Kentucky’s drinking water remains a potential threat to the region.

By coupling spatial sampling of nitrate concentrations in surface water with contemporary nutrient and water quality sensor technology, a decomposition of the Upper South Elkhorn watershed’s nitrate signal and an estimation of source timing and loading in the watershed was completed. The …

Biological Selenium Control: Selenium Reduction By Shigella Fergusonii Strain Tb42616 And Pantoea Vagans Strain Ewb32213-2 In Bioreactor Systems, Yuxia Ji

Theses and Dissertations--Civil Engineering

Se(VI) and Se(IV), as the two major species of selenium in water, are toxic to aquatic lives and may cause adverse health effects to humans at high levels. Biological reduction of Se(VI) is a two-stage process first from Se(VI) to Se(IV) and then from Se(IV) to Se(0) with potential accumulation of the more toxic Se(IV) due to the slower rate of the second stage.

Selenium reduction was first evaluated with batch cultures of Shigella fergusonii strain TB42616 (TB) and Pantoea vagans strain EWB32213-2 (EWB) isolated in our laboratory from sludge and coal slurry sediment samples, respectively. In order to facilitate …

Assessment Of A Surface Water Supply For Source And Treated Distribution System Quality, Angela Rodriguez

Electronic Theses and Dissertations

This study focused on providing a source to tap assessment of surface water systems with respect to (i) the use of alternative biomonitoring tools, (ii) disinfection byproduct (DBP) formation and control, and (iii) corrosion control. In the first study component, two water systems were microbiologically evaluated using adenosine triphosphate (ATP) bioluminescence technology. It was determined that microbial ATP was useful as a surrogate for biomonitoring within a surface water system when paired with traditional methods. Although microbial activity differed between distribution systems that used either chloramine or chlorine disinfectant, in both cases flowrate and season affected microbial ATP values. In …

Design, Synthesis And Characterization Of Biomimetic, Bioinspired And Bio-Related Functional Polymers For Atmospheric Water Recovery, Abdullah Alqassar

Electronic Theses and Dissertations

Atmospheric water recovery in changing environments has received wide attention in environmental science and engineering communities due to rapid population growth and frequent droughts. This study is focused on the design, synthesis, and characterization of biomimetic, bioinspired, and bio-related functional polymers (b3p) to help resolve the water supply issue especially in arid or semi-arid regions. It is aimed to develop unique synthetic methods to access well-defined polymers with the aid of nanomaterials and metal to produce next generation polymer materials for better atmospheric water recovery. The design of such new b3p is bioinspired by some skin materials of biological species …

Long-Term Carbon And Copper Impact On Nutrient Removal Via Green Sorption Media In Dynamic Linear Ditch Environments, Diana Ordonez

Electronic Theses and Dissertations

Nutrient-laden stormwater runoff causes environmental and ecological impacts on receiving water bodies. Biosorption Activated Media (BAM) composed of the sand, tire crumb, and clay have been implemented in stormwater best management practices due to its ability to efficiently remove nutrients from stormwater runoff, such as in roadside linear ditches, via unique chemophysical and microbiological processes. In this study, a set of fixed-bed columns were set up to simulate some external forces in roadside linear ditches and examine how these external forces affect the performance of BAM. In our experiment, scenario 1 simulates the impact that animals such as tortoises, moles …

Adsorption Capacity Assessment Of Advance Green Environmental Media To Remove Nutrients From Stormwater-Runoff, Hanan Elhakiem

Electronic Theses and Dissertations

Best Management Practices (BMPs) in stormwater treatment are a suite of treatment alternatives to deal with pollutant removal problems from stormwater runoff. Biosorption-activated media (BAM) are green sorption media consists of recycled materials have shown excellent nutrient removal as an effective BMP by enhancing physicochemical and microbiological processes. In this study, Iron-Filling Green Environmental Media (denoted as IFGEM-3) and Advanced Green Environmental Media 1 and 2 (denoted as AGEM-1 and AGEM-2) were produced and tested for their adsorption capacities as well as removal and recovery potential for phosphate, nitrate, and ammonia against natural soil (baseline) collected from a stormwater retention …

Optimal Recipe Screening And Applications Of Iron-Filings Based Green Environmental Media (Ifgem) For Stormwater Treatment, Andrea Valencia

Electronic Theses and Dissertations

The applications of green sorption media for stormwater treatment and nutrient removal benefit surface and ground water bodies by reducing non-point source pollution from stormwater runoff. To enhance nitrogen and phosphorus removal, a sequential study was performed to develop an improved green sorption media in this study by including the iron filings into the previous biosorption activated media (BAM). The iron-filings-based green environmental media (IFGEM) are thus composed of sand, tire crumb, clay and ground iron filings in which clay and iron particles are supposed to have salient interactions that cannot be present in BAM. However, the optimal ratio between …

Comparative Nutrient Removal With Innovative Green Soprtion Media For Groundwater And Stormwater Co-Treatment, Dan Wen

Electronic Theses and Dissertations

As indicated by the National Academy of Engineering, the understanding of nitrogen cycle has been deemed as one of 14 grand challenges in engineering of the 21st century. Due to rapid population growth and urbanization, the stormwater runoff increased in quantity as well as its nutrient concentrations, which may trigger serious environmental issues such as eutrophication in aquatic systems and ecosystem degradation. This study focuses on stormwater and groundwater quality control via Biosorption Activated Media (BAM) which can be applied to enhance the nutrient removal potential as an emerging Best Management Practices (BMPs). BAM was tested in this study with …

Improved Methods For The Quantification Of Viable Ascaris Suum And Application To Biosolids, Tanner Keyzers

Dissertations, Master's Theses and Master's Reports

The current method for detection of Ascaris ova in biosolids and wastewater has several drawbacks including being labor and time intensive as well as being difficult to quantify viable ova that have larvated during treatment. The goal of this thesis was to improve several methods for the detection and quantification of Ascaris ova during long term-storage of biosolids including improvement of quantifying viable ova using a heat and bleach treatment to promote movement of larvae inside of ova, and comparison of the traditional microscopic method with qPCR and PMA-qPCR to prevent the false-positive results. Improved methods to promote movement of …

Assessing Benthic Recovery In The Torch Lake Aoc, Anya Clare Leach

Dissertations, Master's Theses and Master's Reports

Torch Lake, located in Michigan’s Upper Peninsula, was a site of copper ore processing from the 1860s through the 1960s. During this time, various mining by-products were deposited into the lake and along its shoreline, including mine tailings and associated heavy metals contaminants (e.g., copper). It was anticipated that natural sediment deposition would cover and attenuate toxic sediments over time, but a comprehensive assessment of the benthos has not been performed since a baseline survey conducted in 1999 and 2000. This study was conducted in 2018 to evaluate the current benthic community status as well as sediment composition and metal …

Actual Evapotranspiration And Crop Coefficients Of Irrigated Lowland Rice (Oryza Sativa L.) Under Semiarid Climate, Koffi Djaman, Daran R. Rudnick, Yonnelle D. Moukoumbi, Abdoulaye Sow, Suat Irmak

Department of Agricultural and Biological Systems Engineering: Faculty Publications

Lowland irrigated rice is the predominant crop produced in the Senegal River Valley characterized by very low annual rainfall, high temperatures, and low relative humidity. The Senegal River is shared by Senegal, Mali, Mauritania, and Guinea, and serves as the main source of irrigation water for the adopted double rice cropping system. Developing appropriate resource management strategies might be the key factor for the sustainability of rice production in the region. This study aims to estimate rice seasonal evapotranspiration (ETa), irrigation water requirement, and to develop rice growth stage specific crop coefficients (Kc) to improve rice water productivity. Field experiments …

Metabolic Compounds Within The Porcine Uterine Environment Are Unique To The Type Of Conceptus Present During The Early Stages Of Blastocyst Elongation, Sophie C. Walsh, Jeremy R. Miles, Linxing Yao, Corey D. Broeckling, Lea A. Rempel, Elane C. Wright-Johnson, Angela K. Pannier

Department of Agricultural and Biological Systems Engineering: Faculty Publications

The objective of this study was to identify metabolites within the porcine uterine milieu during the early stages of blastocyst elongation. At Days 9, 10, or 11 of gestation, reproductive tracts of White cross‐bred gilts (n = 38) were collected immediately following harvest and flushed with Roswell Park Memorial Institute‐1640 medium. Conceptus morphologies were assessed from each pregnancy and corresponding uterine flushings were assigned to one of five treatment groups based on these morphologies: (a) uniform spherical (n = 8); (b) heterogeneous spherical and ovoid (n = 8); (c) uniform ovoid (n = 8); (d) heterogeneous …

Enhancement Of Municipal Wastewater Management System With Polluter Pays Principle (Ppp): A Case Study Of Cities In Thailand, Kwanmanas Meethavorn

Chulalongkorn University Theses and Dissertations (Chula ETD)

Poor water quality in public water bodies caused by several reasons mainly due to a lack of efficient WWM system and sufficient financial support. Polluter pays principle has long been a promising strategy to help improving water quality in pubic water bodies in Thailand. However, WW charge has not yet been practically levied. This research ains to evaluate factors affecting residents' preferences on WTPs for water quality improvement. Three different characteristic cities were selected as case studies. The technique applied to estimate WTPs is CVM to reveal key factors influencing WTP decision as well as WTP pay-out level. The result …

Evaluation Of Naturally Occurring And Anthropogenic Contamination In Missouri Streams, Christina Jane Sehrt

Masters Theses

"The goal of this study is to observe the values and variability of water quality parameters and benthic macroinvertebrates in watersheds with very little anthropogenic impact and to compare these values with those acquired in watersheds with more anthropogenic impact. The following five HUC 12-digit watersheds had very little anthropogenic impact and were considered "pristine": Rogers Creek, Mill Creek, Middle West Fork-Black River, Bee Fork, and Ottery Creek. Five largely urban sub-basins were also considered; these basins are: Grand Glaize Creek, Glaize Creek, Sugar Creek, Hominy Creek, and Grindstone Creek. For each watershed, both water quality parameters and benthic macroinvertebrates …