The aim of this research project was to investigate the scientific and technical feasibility of making unbleached pulp by cooking bagasse with anthraquinone AQ) in conjunction with KOH or KOH and NH4OH. The NH4OH could be used as a pretreatment or in the cooking stage. The design called for recovery of some NH4OH by distillation …
Tag Archive: EnvironmentalSciences
Mar
11
Mar
11
Spatial targeting of conservation tillage to improve carbon sequestration and water quality benefits in an agricultural watershed
This thesis develops an integrated modeling framework that combines a soil organic matter model, a hydrologic model and a farm model with GIS to examine the tradeoffs of carbon sequestration and water quality benefits, and applies it empirically to the Fairchild Creek watershed in the Grand River Basin of Ontario. Within the framework, the hydrologic …
Mar
08
Dimensional stability of concrete slabs on grade
Drying shrinkage is one of the major causes of cracking in concrete slabs on grade. The moisture difference between the top and bottom surface of the slabs causes a dimensional or “shrinkage” gradient to develop through the depth of the slabs. This can cause cracks and warping which result in serviceability and performance problems for …
Mar
06
Fate and transformation of gold nanoparticles in surface water conditions
The inevitable release of man-made gold nanoparticles GNPs) due to a poised array of commercial applications) into surface water will result in simultaneous interactions with aquatic organisms and environmental entities such as humic acid HA). The current research aims at understanding the fate and transformation of gold nanoparticles as emerging pollutants in surface water. The …
Mar
04
Corrosion analyses of iron and steel archaeological shipwreck sites
Great Britain and the United States were, in turn, the worlds leading maritime powers during the nineteenth and early twentieth centuries. Comprehensive historical and archaeological analyses of ship construction practices among these countries, therefore, reveal the predominate types of iron and steel vessels that were built during this time. There are limited data available, though, …
Feb
23
Physicochemical and Geometrical Factors That Influences The Photocatalytic Degradation Kinetics of A Model Water Contaminate
This thesis is written as a series of two technical papers that have been published in technical journals. Each paper has its own abstract, introduction, experimental methods, results and discussion as well as figures and tables. Chapter 1 gives a brief overview of photocatalytic materials. Chapter 2 contains the first paper, which examines the physicochemical …
Feb
22
La contribution d’une entreprise d’economie sociale agricole a l’alimentation de proximite et a la securite alimentaire selon les principes du developpement durable: Le cas de la Recolte de Chez Nous au Sud est du Nouveau-Brunswick
La Recolte de Chez Nous RCN) est une cooperative agricole de la region du sud-est du Nouveau-Brunswick. Cette cooperative deconomie sociale fut creee par plusieurs petits agriculteurs contraints a faire face a plusieurs nouveaux defis, dus entre autres, a la mondialisation des marches et au contexte agricole neo-brunswickois en pleine transformation. Lagriculture est un secteur …
Feb
14
Removal of problematic metals from water via nanoparticle-enhanced membrane filtration
The rising global demand for clean water is challenged by various factors like ever increasing freshwater pollution, more stringent health-based drinking water regulations, and competing demands for clean water from a variety of users. At the same time, the increasing levels of problematic metals in the environment represent a serious threat to human health and …
Jan
20
Development of novel membrane for proton exchange membrane fuel cell using nanostructured ferroxanes
An iron-based ceramic material is shown to have excellent properties as an electrolyte material for proton exchange membrane in fuel cells. These membranes have comparable conductivity to the NafionRTM membrane with the advantages of lower material costs, and the ability to operate at higher temperatures. Iron oxide nanoparticles (ferroxane) were prepared as precursor materials for …
Jan
20
Stream assessment and constructed stormwater wetland research in the North Creek watershed
North Creek is a small urban stream flowing through Centennial Campus, NCSU, Raleigh, NC. The watershed 0.5 mi2) is 40% impervious, with campus development in progress. The purpose of this study was to measure channel morphology, sediment load, water quality, and biological integrity over two years. Streambank erosion rates 0.3–1.7 ft/yr) and streambed erosion in …