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Articles 1 - 9 of 9
Full-Text Articles in Engineering
An Assessment Of Indoor Infiltration Parameters For Black Carbon From Residential Wood Combustion And The Spectral Dependence Of Light Absorption For Organic Carbon, Christopher John Malejan
An Assessment Of Indoor Infiltration Parameters For Black Carbon From Residential Wood Combustion And The Spectral Dependence Of Light Absorption For Organic Carbon, Christopher John Malejan
Master's Theses
Black carbon, a proxy for woodsmoke was measured indoors and outdoors for an occupied residence in Cambria, CA during the winter months of 2009. The purpose was to investigate the infiltration parameters: air exchange rate, deposition rate, and penetration factor. The second part of this study investigated the light absorption properties of organic carbon from residential wood combustion, the dominant fraction of woodsmoke.
To assess woodsmoke variation, a study conducted parallel to the one presented in this thesis (Ward, 2009), a grid array of personal emission monitors (PEMS) and aethalometers were placed in a small area, approximately one square kilometer, …
Extraction And Characterization Of Lipids From Microalgae Grown On Municipal Wastewater, Matthew W. Hutton
Extraction And Characterization Of Lipids From Microalgae Grown On Municipal Wastewater, Matthew W. Hutton
Master's Theses
Based on results of its Aquatic Species Program (1978-1996), which sought to develop algae-to-liquid fuel technology, the U.S. Department of Energy has suggested that algal wastewater treatment may be incorporated into biodiesel production schemes to reduce the operating costs of both processes. the purpose of the current research was to evaluate the triglycerides produced by wastewater-grown algae for their suitability as a fuel feedstock and to investigate the effectiveness of several solvent mixtures and extraction procedures at recovering lipids from fresh algae. The research involved two separate experiments. The first determined the quantity and quality of lipids produced over the …
Investigation Of The Geotechnical Properties Of Municipal Solid Waste As A Function Of Placement Conditions, Wilson W. Wong
Investigation Of The Geotechnical Properties Of Municipal Solid Waste As A Function Of Placement Conditions, Wilson W. Wong
Master's Theses
An investigation of the variability of engineering properties of municipal solid waste as a function of placement conditions was conducted. Limited data have been reported for the engineering properties of municipal solid waste (MSW) as a function of placement conditions. Wastes have high variability of engineering properties due to heterogeneity in composition and component size; influence from time based effects; and presence of compressible solids. Control of moisture content of MSW at the time of waste placement provides opportunity for increased capacity at a given landfill site due to higher compacted unit weight as well as for control of other …
Removal Of Boron From Produced Water By Co-Precipitation / Adsorption For Reverse Osmosis Concentrate, Imran Yusuf Rahman, Yarrow Nelson, Tryg Lundquist
Removal Of Boron From Produced Water By Co-Precipitation / Adsorption For Reverse Osmosis Concentrate, Imran Yusuf Rahman, Yarrow Nelson, Tryg Lundquist
Master's Theses
Co-precipitation and absorption methods were investigated for removal of boron from produced water, which is groundwater brought to the surface during oil and natural gas extraction. Boron can be toxic to many crops and often needs to be controlled to low levels in irrigation water. The present research focused on synthetic reverse osmosis (RO) concentrate modeled on concentrate expected from a future treatment facility at the Arroyo Grande Oil Field on the central coast of California. The produced water at this site is brackish with a boron concentration of 8 mg/L and an expected temperature of 80°C. The future overall …
Simultaneous Nitrification And Denitrification Of Wastewater Using A Silicone Membrane Aerated Bioreactor, Kirk Hjelte Waltz
Simultaneous Nitrification And Denitrification Of Wastewater Using A Silicone Membrane Aerated Bioreactor, Kirk Hjelte Waltz
Master's Theses
The purpose of this thesis is to investigate the use of a single reactor to biologically treat wastewater by simultaneously oxidizing ammonia, and reducing nitrate and nitrite. The Environmental Protection Agency (EPA) places strict discharge restrictions on these compounds due to their inherent toxicity to humans, wildlife, and ecosystems. The use of a simultaneous system can assist the conventional wastewater treatment technology that requires separate systems, by creating a system that needs less time and smaller size to reach effluent requirements. To conduct this research, a bench-scale membrane aerated biofilm reactor was built using silicone tubing for aeration. Batch and …
Phytoremediation Of Weathered Petroleum In Groundwater By Arroyo Willows In Nutrient Amended On-Site Mesocosms, Sarah E. Bragg-Flavan
Phytoremediation Of Weathered Petroleum In Groundwater By Arroyo Willows In Nutrient Amended On-Site Mesocosms, Sarah E. Bragg-Flavan
Master's Theses
PHYTOREMEDIATION OF WEATHERED PETROLEUM IN GROUNDWATER BY ARROYO WILLOWS IN NUTRIENT AMENDED ON-SITE MESOCOSMS
SARAH BRAGG-FLAVAN
A large-scale mesocosm study was conducted to determine if vegetation with willow trees enhances biodegradation and to evaluate the mechanisms of natural biodegradation of weathered petroleum compounds under field conditions. The mesocosms were designed to model conditions at a former oil field where mid-range petroleum distillates were used as a diluent for pumping crude oil contaminated the soil and groundwater at the site with petroleum compounds. Ten mesocosms were constructed at the field site using un-impacted soil and diluent-impacted groundwater from the site. Five …
Performance Of A Catch Basin Filter And Leachate From Biocidal Media For Stormwater Treatment, Ryan Scott Maclure
Performance Of A Catch Basin Filter And Leachate From Biocidal Media For Stormwater Treatment, Ryan Scott Maclure
Master's Theses
The feasibility of installing biocidal beads into a catch basin filter insert for simultaneous stormwater disinfection and contaminant removal was tested. The catch basin filter insert (DrainPac®) was tested for its sediment, oil and grease, and coliform bacteria removal efficiency in conjunction with bench-scale testing of biocidal polymer beads. DrainPac® catch basin filters are composed of a metal frame, polypropylene filter fabric, and a high-density polymer support basket, and are installed below storm drains. A 12 x 41 in. DrainPac® filter (United Stormwater, Inc.) insert was set in a flume that simulated a large-scale catchment basin. Pond water was gravity …
Impacts Of Delayed Drawdown On Water Quality And Aquatic Biota In Seasonal Wetlands Of The Grassland Ecological Area, Los Banos, California, Kyle Nathan Poole
Impacts Of Delayed Drawdown On Water Quality And Aquatic Biota In Seasonal Wetlands Of The Grassland Ecological Area, Los Banos, California, Kyle Nathan Poole
Master's Theses
The 178,000-acre Grassland Ecological Area in California’s San Joaquin Valley is managed to provide overwintering habitat to waterfowl on the Pacific Flyway. The major management activity is the fall flooding and spring drawdown of wetlands, timed to optimize the availability of forage vegetation and invertebrates for ducks and shorebirds. Wetland drainage contains salt, boron, and trace elements that are, in part, derived from imported surface water but also concentrate during storage in the wetland impoundments. The spring drawdown drainage contributes to occasional water quality violations in the San Joaquin River (SJR) during dry years. Compliance with water quality objectives may …
Temperature Influence And Heat Management Requirements Of Microalgae Cultivation In Photobioreactors, Thomas Hagen Mehlitz
Temperature Influence And Heat Management Requirements Of Microalgae Cultivation In Photobioreactors, Thomas Hagen Mehlitz
Master's Theses
Microalgae are considered one of the most promising feedstocks for biofuel production for the future. The most efficient way to produce vast amounts of algal biomass is the use of closed tubular photobioreactors (PBR). The heat requirement for a given system is a major concern since the best algae growth rates are obtained between 25-30 °C, depending on the specific strain. A procedure to determine temperature influence on algal growth rates was developed for a lab-scale PBR system using the species Chlorella. A maximum growth rate of 1.44 doublings per day at 29 °C (optimal temperature) was determined. In addition, …