Civil and Environmental Engineering presentations (MU)The items in this collection are the scholarly output of the faculty, staff, and students of the Department of Civil and Environmental Engineering.https://hdl.handle.net/10355/69532024-03-29T15:06:50Z2024-03-29T15:06:50ZInfluence of pH, ionic strength and natural organic matter concentration on a MIP-Fluorescent sensor for the quantification of DNT in waterDai, J.Fidalgo, de Cortalezzi M.https://hdl.handle.net/10355/745702023-04-20T15:20:53Z2019-01-01T00:00:00ZInfluence of pH, ionic strength and natural organic matter concentration on a MIP-Fluorescent sensor for the quantification of DNT in water
Dai, J.; Fidalgo, de Cortalezzi M.
The effect of sample water chemistry on a carbon dot labeled molecularly imprinted polymer (AC-MIP) sensor for the detection of 2,4-dinitrotoluene (DNT) was investigated. Hydrogel MIP films were fabricated and tested in DNT solutions in various matrices, representative of natural water conditions, to assess applicability of the sensors to real water samples. The effect of pH, natural organic matter (NOM), ionic strength and cation type on the swelling of the hydrogel and fluorescence quenching was investigated. An increase in ionic strength from 1 mM to 100 mM produced a quenching amount of MIPs decreased of about 19 percent and 30 percent with NaCl and CaCl2 respectively. In the range of pH tested, from 4 to 9, quenching was higher at basic environment for both MIPs and non-imprinted polymers (NIPs) due to increased hydrogel swelling. NOM contributed to the background quenching, but the effect could be addressed by an adjusted calibration equation. In both lake and tap water, DNT concentrations read by the sensors were close to the values measured by HPLC, within 72 percent–105 percent of true values. The AC-MIP films fabricated in this work are promising materials for the detection of water contamination in the field and the quantitative analysis of DNT concentration.
2019-01-01T00:00:00ZInvestigating short-term and long-term binder performance of high-RAP mixtures containing waste cooking oilMajidifard, H.Tabatabaee, N.Buttlar, W.https://hdl.handle.net/10355/745812023-04-20T15:20:53Z2019-01-01T00:00:00ZInvestigating short-term and long-term binder performance of high-RAP mixtures containing waste cooking oil
Majidifard, H.; Tabatabaee, N.; Buttlar, W.
The environmental and economic benefits of recycling asphalt pavements have received much attention in recent years. Because of the increase in the cost of raw materials and energy carriers, the reuse of large portions of reclaimed asphalt pavement (RAP) is critical in reducing both the cost and environmental footprint of asphalt pavements. High-RAP mixtures are more prone to low temperature cracking and poor mixture workability because of the higher stiffness of RAP binder. Recycling agents are one of the additives which are used to improve these deficiencies. However, there is some ambiguity about the optimum content of recycling agent to assure proper performance of recycled asphalt pavement during its service life. The current study used 60 percent and 100 percent fractionated RAP with waste cooking oil as a recycling agent and crumb rubber to alleviate the aforementioned problems. Laboratory evaluation showed that increasing the amount of recycling agent in the high-RAP mixtures improved their workability and low temperature performance while decreasing moisture damage and rutting resistance. The long-term susceptibility to aging of recycled binder with the organically-based recycling agent was also investigated. A procedure to obtain the optimum percentage of recycling agent was devised to strike a balance between the performance characteristics of mixtures with a high-RAP content.
2019-01-01T00:00:00ZLandfill Methane Collection in Brazil [abstract]Buckley, PhilBowders, John J. (John Joseph), 1957-https://hdl.handle.net/10355/11982017-03-21T17:54:04Z2009-01-01T00:00:00ZLandfill Methane Collection in Brazil [abstract]
Buckley, Phil; Bowders, John J. (John Joseph), 1957-
The US EPA requested proposals for projects that focus on reduction of greenhouse gases (GHG) worldwide. Advancing the recovery and use of methane generated in landfills as an energy source is a primary objective. The overall project goal is to develop a “Master Plan for Landfill Management for the State of Espirito Santo, Brazil” specifically aimed at the optimization of production, capture, and use of methane from the degradation of solid wastes. The first task of the project is to compile information on the current state of landfill practices from design, through construction and operation as practiced in Brazil, and the United States. Emphasis will be placed on current proven practice, but will provide insight to innovative technologies for landfill gas recovery and utilization.
The objective is to prepare a state-of-the-practice (SOP) report on technologies for generation, recovery, and use of methane generated in landfills in the USA. These practices will be considered for application to landfill issues in ES in a later task of the project. Reduction of landfill gas emissions and possible utilization of the gas (methane) can result in a reduction of greenhouse gases and provide additional revenue to landfill owners through sales of electricity, heating fuel or hot water. The use of landfill gas directly offsets use of oil based energy production.
The coverage of SOP technologies includes those implemented in the United States as there are a significant number of existing landfills operating advanced technologies. Information on recent studies of eleven landfills in Brazil is also summarized, and it points to appropriate technology use in Brazil.
Only abstract of poster available.; Track III: Energy Infrastructure
2009-01-01T00:00:00ZUniversity of Missouri Led Energy Efficient Projects in Global Market: Application of Sustainable Ground Energy in Olympic Facilities [abstract]Xu, Shawn Yunshenghttps://hdl.handle.net/10355/12742017-03-21T17:54:16Z2009-04-01T00:00:00ZUniversity of Missouri Led Energy Efficient Projects in Global Market: Application of Sustainable Ground Energy in Olympic Facilities [abstract]
Xu, Shawn Yunsheng
University of Missouri, Columbia (MU) faculty members are involved in energy efficient projects in China with grant support by both the U.S. and Chinese governments. A large commercial building was selected by the Beijing City Government to demonstrate sustainable energy applications for space heating and cooling, prior to the construction of the 2008 Beijing Olympic Facilities. A large underground heat exchange system with 700 borehole matrix was designed by Dr. Shawn Xu to provide full heating and cooling of a building with a space of 287,000m2 (309,000 ft2). Economic analysis with actual initial installation investment and operation costs for the project showed the feasibility of this technology. After successful operation of the demonstration project, Dr. Xu assisted the Chinese developers in adopting similar energy efficient technologies for the 2008 Beijing Olympic Facilities. Detailed engineering aspects of the energy efficient utility system for the National Stadium (Bird Nest), Olympic Athlete Village, and the National Olympic Forest Park will be given in the presentation. MU opened its Environmental and Energy Technology Office (ENTECH) in Beijing in 2006 through a partnership with the U.S. Department of Commerce. ENTECH serves as a resource center for information on US environmental and energy efficient technologies and products for use in China.
Only abstract of poster available.; Track III: Energy Infrastructure
2009-04-01T00:00:00Z