Open Access. Powered by Scholars. Published by Universities.®

Environmental Engineering Commons

Open Access. Powered by Scholars. Published by Universities.®

3861 Full-Text Articles 6483 Authors 703373 Downloads 90 Institutions

All Articles in Environmental Engineering

Faceted Search

3861 full-text articles. Page 1 of 136.

Everglades Drainage District: Biennial Report 1927-1928 To The Board Of Commissioners Of Everglades Drainage District, F C. Elliot 2017 University of North Florida

Everglades Drainage District: Biennial Report 1927-1928 To The Board Of Commissioners Of Everglades Drainage District, F C. Elliot

City and Regional Planning—Florida

Everglades Drainage District report 1927-1928


Reuse Of Water Treatment Residuals From Lime Softening, Part I: Applications For The Reuse Of Lime Sludge From Water Softening, Johannes van Leeuwen, David J. White, Rob J. Baker, Christopher Jones 2017 Iowa State University

Reuse Of Water Treatment Residuals From Lime Softening, Part I: Applications For The Reuse Of Lime Sludge From Water Softening, Johannes Van Leeuwen, David J. White, Rob J. Baker, Christopher Jones

David J. White

Lime sludge, an inert material mostly composed of calcium carbonate, is the result of softening hard water before distribution as drinking water. A large city such as Des Moines, Iowa, produces about 32 000 tons of lime sludge (dry-weight basis) annually. This is about half of the lime sludge produced in Iowa per year in eight different cities, and these cities currently have 371 800 tons (dry-weight basis) stockpiled. The Iowa Department of Natural Resources directed those cities using lime softening in drinking-water treatment to stop digging new lagoons to dispose of lime sludge. The situation in surrounding Midwestern states ...


Building Information Modelling In Ireland 2017, Barry McAuley, Alan Hore, Roger West 2017 Dublin Institute of Technology

Building Information Modelling In Ireland 2017, Barry Mcauley, Alan Hore, Roger West

Reports

BIM is perhaps the most topical issue in construction throughout the world at present, as it is associated with solving so many of the present concerns in our industry.

Our lack of housing, shortage of skilled workers, poor document management, overrunning project budgets and sustainability challenges are just a few of the challenges that BIM promises to assist in solving.

The increasing importance of “digitisation” to modern construction and engineering businesses is becoming more apparent as more and more clients are explicitly asking for BIM in the design and delivery of new facilities and infrastructure.

This report provides a snapshot ...


Electrokinetic Consolidation Of Oil Sands Tailings: An Experimental And Numerical Study, Yu Guo 2017 The University of Western Ontario

Electrokinetic Consolidation Of Oil Sands Tailings: An Experimental And Numerical Study, Yu Guo

Electronic Thesis and Dissertation Repository

The management of fine oil sands tailings, known as mature fine tailings (MFT), is a major challenge for the oil industry in the Northern Alberta, Canada. Dewatering and consolidation of MFT are slow and time consuming due to high water content and low permeability of MFT. The electrokinetic (EK) dewatering treatment has shown to be effective on oil sands tailings based on the results of previous researches. Therefore, this thesis is focusing on experimental and numerical studies of EK dewatering of oil sands tailings. The thesis includes three parts, i.e., EK dewatering of oil sands tailings and kaolinite slurry ...


Sub 2 Nm Particle Characterization In Systems With Aerosol Formation And Growth, Yang Wang 2017 Washington University in St. Louis

Sub 2 Nm Particle Characterization In Systems With Aerosol Formation And Growth, Yang Wang

Engineering and Applied Science Theses & Dissertations

Aerosol science and technology enable continual advances in material synthesis and atmospheric pollutant control. Among these advances, one important frontier is characterizing the initial stages of particle formation by real time measurement of particles below 2 nm in size. Sub 2 nm particles play important roles by acting as seeds for particle growth, ultimately determining the final properties of the generated particles. Tailoring nanoparticle properties requires a thorough understanding and precise control of the particle formation processes, which in turn requires characterizing nanoparticle formation from the initial stages. The knowledge on particle formation in early stages can also be applied ...


Netpoint®, Purdue ECT Team 2017 Construction Engineering & Management, Purdue University

Netpoint®, Purdue Ect Team

ECT Fact Sheets

The vast majority of construction scheduling software uses a combination of spreadsheets and Gantt charts for developing and depicting Critical Path Method (CPM) schedules. While this paradigm works for the expert scheduler, it is not conducive to collaboration, and it is prohibitively difficult for non-scheduling experts to understand.

NetPoint® provides a dynamic, visual interface conducive to touch and gestural input. Activities are drawn directly on a time-scale and may be placed on the same row or arranged automatically using codes or the WBS. Such control of the presentation makes it easier to communicate the plan to any type of audience ...


Fluid Isolator, Purdue ECT Team 2017 Construction Engineering & Management, Purdue University

Fluid Isolator, Purdue Ect Team

ECT Fact Sheets

The reliability of concrete infrastructure is vital to ensuring daily life, as well as commerce, can progress without interruption. From the pavement of interstate highways to the driveways and sidewalks in a local neighborhood, concrete is expensive to install and often even more expensive, and intrusive, when it needs to be replaced. Unfortunately, to maintain functionality in winter climates concrete is heavily exposed to deicing salts. This not only affects the roads, driveways, and sidewalks where salt is applied directly, but many other areas such as parking and residential garages where vehicles (and people) will track salt along with water ...


Pilot Reactor Operation Of The Oxygenic Photogranule (Opg) Wastewater Treatment Process, Adam Matthew McNair 2017 University of Massachusetts Amherst

Pilot Reactor Operation Of The Oxygenic Photogranule (Opg) Wastewater Treatment Process, Adam Matthew Mcnair

Environmental & Water Resources Engineering Masters Projects

Treating wastewater is imperative for maintaining public health and sanitation as well as the natural environment. In the United States and developed countries around the globe, the activated sludge (AS) process has been paramount in effectively treating wastewater for over a century. However, high energy consumption due to required mechanical aeration of AS limits its potential as a sustainable process. The oxygenic photogranule (OPG) wastewater treatment process utilizes the photosynthetic ability of OPGs made possible by the symbiosis between heterotrophic AS and filamentous cyanobacteria and algae in dense, spherical biogranules. This research presents pilot operation of the OPG wastewater treatment ...


Evaluation Of Phosphorous Removals By Biochar Supported Nano-Scale Zero-Valent Iron, Maria S. Rossetti 2017 University of Arkansas

Evaluation Of Phosphorous Removals By Biochar Supported Nano-Scale Zero-Valent Iron, Maria S. Rossetti

Chemical Engineering Undergraduate Honors Theses

This study evaluated the effectiveness of biochar-supported nano-scale zero-valent iron (nZVI/BC) in removing phosphorus (P) from water. Samples of nZVI/BC were prepared using aqueous nanoparticles synthesis techniques, and were mixed with a stock phosphorus solution. To determine P reductions water samples were tested for P content using the ascorbic acid method. This procedure was repeated for samples of stock P solution, zero-valent iron (ZVI), biochar, and ZVI/BC. nZVI/BC reduced P content by 86% whereas ZVI, biochar, and ZVI/BC removed 6%, -23%, and 17% respectively. This suggests that nZVI/BC has the potential to be an ...


Passive Solar Distillation Of Acid Rock Drainage, Stephanie Shreve, Luke Galuska, Anna Stoller, Alex Raney, Agustin Caceres, Caitlyn Chambers, Chris Graham, Devin Hazlett 2017 University of Arkansas, Fayetteville

Passive Solar Distillation Of Acid Rock Drainage, Stephanie Shreve, Luke Galuska, Anna Stoller, Alex Raney, Agustin Caceres, Caitlyn Chambers, Chris Graham, Devin Hazlett

Chemical Engineering Undergraduate Honors Theses

Arkansas Razorback Distillers (A.R.D.) has developed a passive solar distillation system for treating acid rock drainage (ARD) from legacy (i.e., abandoned) mines. The solar still addresses the need to reduce both the metal sulfate contaminants as well as the acidity of acid rock drainage. During the design phase, A.R.D. addressed the need for the system to be low cost, simple, and effective for general use as well as a specified location. To demonstrate the applicability of the solar still, A.R.D. used the Freeport McMoRan Inc. Copper Queen legacy mine in Bisbee, Arizona, as ...


Wastewater Treatment Improvement For Rush Strong School, Christina R. Sanford UTK, Kelli M. Grissom, Katie Gipson, Sharon Counts 2017 UTK

Wastewater Treatment Improvement For Rush Strong School, Christina R. Sanford Utk, Kelli M. Grissom, Katie Gipson, Sharon Counts

University of Tennessee Honors Thesis Projects

No abstract provided.


Analysis Of Lid Implementation To Combat Flooding And Erosion At The University Of Arkansas Campus, Madison E. Crowl 2017 University of Arkansas, Fayetteville

Analysis Of Lid Implementation To Combat Flooding And Erosion At The University Of Arkansas Campus, Madison E. Crowl

Biological and Agricultural Engineering Undergraduate Honors Theses

The city of Fayetteville, Arkansas has experienced rapid urbanization throughout recent years as it continues to grow. Within the city, the University of Arkansas has been constantly expanding, with increased impervious surfaces as more parking lots and facilities are built. This has caused issues including flooding and stream bank erosion, specifically in Mullins Creek, which receives runoff from a large part of campus. A portion of the creek was restored, but there are still downstream issues. Low Impact Development (LID) is a type of green infrastructure that has been shown to decrease runoff and increase infiltration. EPA SWMM, a hydrologic ...


Trihalomethane, Dihaloacetonitrile, And Total N-Nitrosamine Precursor Adsorption By Carbon Nanotubes: The Importance Of Surface Oxides And Pore Volume, Erin Needham 2017 University of Arkansas, Fayetteville

Trihalomethane, Dihaloacetonitrile, And Total N-Nitrosamine Precursor Adsorption By Carbon Nanotubes: The Importance Of Surface Oxides And Pore Volume, Erin Needham

Theses and Dissertations

As drinking water sources become increasingly impaired, enhanced removal of natural organic matter (NOM) may be required to curb formation of disinfection byproducts (DBPs) upon chlor(am)ination. While carbon nanotubes (CNTs) can adsorb NOM, their properties for DBP precursor adsorption have not been elucidated. Nine types of CNTs were assessed for trihalomethane (THM), dihaloacetonitrile (DHAN), and total N-nitrosamine (TONO) precursor adsorption. Batch isotherm experiments were completed with lake water and, to simulate an impaired condition, effluent from a wastewater treatment plant (WWTP). Adsorption varied with CNT type and dose, with TONO precursors having the highest percent removals from WWTP ...


Understanding N-Nitrosodimethylamine Formation In Water: Chloramine Chemistry, Kinetics, And A Proposed Reaction Pathway, Huong Thu Pham 2017 University of Arkansas, Fayetteville

Understanding N-Nitrosodimethylamine Formation In Water: Chloramine Chemistry, Kinetics, And A Proposed Reaction Pathway, Huong Thu Pham

Theses and Dissertations

The formation of N-nitrosodimethylamine (NDMA) in drinking water systems is a concern because of its potential carcinogenicity and occurrence at toxicologically relevant levels. The postulated mechanism for NDMA formation involves a substitution between dichloramine and amine-based precursors to form an unsymmetrical dimethylhydrazine (UDMH), which is then oxidized by ground-state molecular oxygen to form NDMA. However, this latter reaction is spin forbidden, thus likely occurs at a slow rate. It is hypothesized that the reaction between monochloramine and hydroxylamine (a nitrification product) may form an intermediate, which is involved in the NDMA formation pathway. This intermediate may also be generated from ...


Total N-Nitrosamine Precursor Adsorption With Carbon Nanotubes: Elucidating Controlling Physiochemical Properties And Developing A Size-Resolved Precursor Surrogate, Erin Needham 2017 University of Arkansas, Fayetteville

Total N-Nitrosamine Precursor Adsorption With Carbon Nanotubes: Elucidating Controlling Physiochemical Properties And Developing A Size-Resolved Precursor Surrogate, Erin Needham

Theses and Dissertations

As drinking water sources become increasingly impaired with nutrients and wastewater treatment plant (WWTP) effluent, formation of disinfection byproducts (DBPs) – such as trihalomethanes (THMs), dihaloacetonitriles (DHANs), and N-nitrosamines – during water treatment may also increase. N-nitrosamines may comprise the bulk of the chronic toxicity in treated drinking waters despite forming at low ng/L levels. This research seeks to elucidate physicochemical properties of carbon nanotubes (CNTs) for removal of DBP precursors, with an emphasis on total N-nitrosamines (TONO).

Batch experiments with CNTs were completed to assess adsorption of THM, DHAN, and TONO precursors; physiochemical properties of CNTs were quantified through gas ...


Impacts Of Climate Change On Streamflow In The Upper Mississippi River Basin: A Regional Climate Model Perspective, Manoj K. Jha, Zaitao Pan, Eugene S. Takle, Roy R. Gu 2017 Iowa State University

Impacts Of Climate Change On Streamflow In The Upper Mississippi River Basin: A Regional Climate Model Perspective, Manoj K. Jha, Zaitao Pan, Eugene S. Takle, Roy R. Gu

Eugene Takle

Impact of climate change on streamflow in the Upper Mississippi River Basin is evaluated by use of a regional climate model (RCM) coupled with a hydrologic model, Soil and Water Assessment Tool (SWAT). The RCM we used resolves, at least partially, some fine-scale dynamical processes that are important contributors to precipitation in this region and that are not well simulated by global models. The SWAT model was calibrated and validated against measured streamflow data using observed weather data and inputs from the U.S. Environmental Protection Agency Better Assessment Science Integrating Point and Nonpoint Sources (BASINS) geographic information systems/database ...


The Impacts Of Climate Change On Stream Flow In The Upper Mississippi River Basin: A Regional Climate Model Perspective, Manoj K. Jha, Zaitao Pan, Eugene S. Takle, Roy R. Gu 2017 Iowa State University

The Impacts Of Climate Change On Stream Flow In The Upper Mississippi River Basin: A Regional Climate Model Perspective, Manoj K. Jha, Zaitao Pan, Eugene S. Takle, Roy R. Gu

Eugene Takle

We evaluate the impact of climate change on stream flow in the Upper Mississippi River Basin (UMRB) by using a regional climate model (RCM) coupled with a hydrologic model, the Soil and Water Assessment Tool (SWAT). The SWAT model was calibrated and validated against measured stream flow data using observed weather data and inputs from the Environmental Protection Agency’s BASINS (Better Assessment Science Integrating Point and Nonpoint Sources) geographical information/database system. The combined performance of the SWAT and RCM was examined using observed weather data as a lateral boundary condition in the RCM. The SWAT and RCM were ...


Smartvid.Io, Purdue ECT Team 2017 Construction Engineering & Management, Purdue University

Smartvid.Io, Purdue Ect Team

ECT Fact Sheets

The collection, organization, and retrieval of industrial media is a pervasive challenge that is especially glaring for companies in the AEC industry. Construction projects often generate large volumes of pictures & videos from the field for tracking progress and communicating between engineers, contractors, and subcontractors. It is not uncommon for field personnel to capture hundreds of photos per week on any given jobsite.

Smartvid.io is a cloud-based software solution designed for the specific needs of industrial media. The application’s internal deep-learning engines, collectively nicknamed VINNIE (for ‘Very Intelligent Neural Network for Insight and Evaluation’), use speech and image recognition ...


Hillman Composite Beam (Hcb®), Purdue ECT Team 2017 Construction Engineering & Management, Purdue University

Hillman Composite Beam (Hcb®), Purdue Ect Team

ECT Fact Sheets

The Hillman-Composite Beam (HCB®), is an innovative structural member for use in highway and railroad bridges as well as marine facilities. The HCB is essentially a lightweight reinforced concrete beam strengthened and protected by a corrosion-resistant and resilient Fiberglass Reinforced Polymer (FRP) shell.

The beam is comprised of three main components, a concrete arch (compression reinforcement), an FRP bottom flange encapsulating steel strands tying the ends of the arch together (tension reinforcement) and the FRP shell. Galvanized Rebar “shear connectors” are used to make the beam composite with the concrete deck in the same manner as pre-stressed concrete beams.

The ...


Evaluation Of A Supervisor Training Program For Odot’S Ecodrive Program, Donald M. Truxillo, John MacArthur, Leslie B. Hammer, Talya N. Bauer 2017 Portland State University

Evaluation Of A Supervisor Training Program For Odot’S Ecodrive Program, Donald M. Truxillo, John Macarthur, Leslie B. Hammer, Talya N. Bauer

Leslie B. Hammer

Eco-driving consists of using energy-efficient approaches to driving aimed at reducing fuel consumption and, ultimately, CO2 emissions. A previous study found that an EcoDrive informational campaign was effective at increasing the use of eco-driving behaviors, but only when employees perceived that their supervisor supported the program and when they were personally motivated to perform the eco-driving behaviors. In order to build upon the findings of our previous study, the present study focused on increasing the use of eco-driving behaviors through an informational eco-driving campaign combined with supervisor training to support the use of eco-driving practices. In this study we collected ...


Digital Commons powered by bepress