Browsing by Subject "Air -- Pollution"
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Item Effects of wick contamination and thermal component variation on thermal indices(Texas Tech University, 1986-05) Lee, Chin HyongAn experiment was performed in order to provide solutions to several problem areas in the assessment of the hot working environment. The following areas were studied: 1. Effect of wick contamination on wet bulb thermometer and Botsball. 2. Effect of wick wetness on Botsball temperature. 3. Effect of thermometer shielding against radiant heat on natural wet bulb temperature. 4. Effect of air velocity and radiant heat on the relationship between natural wet bulb temperature and psychrometric wet bulb temperature. 5. Effect of air velocity on globe thermometer response. 6. Intercomparison of thermal indices (WBGT, WGT, ET*, HSI, DTLV, ISODLE) under varying thermal components. 7. Wet Bulb Globe Temperature and Wet Globe Temperature relationship under varying thermal components. 8. Development of a simple to determine and use exposure limit to the hot environment. Several environmental measurements were made throughout the experiment. Also, several thermal indices were calculated using the environmental data obtained. Several findings of the study are as follows: 1. Wick contamination causes significant errors in the measurement of natural wet bulb temperatures. A set of general rules to correct errors is provided. 2. Wick contamination does not cause errors in the measurement of Botsball temperatures. 3. The wetness of the Botsball wick does not affect the measurement of Botsball temperatures. 4. Radiant heat and air velocity affect the measurement of natural wet bulb temperatures. The relationship between shielded and unshielded natural wet bulb temperatures is found as a function of air velocity and radiant heat. Also, the relationship between natural wet bulb temperature and psychrometric wet bulb temperature is found under various radiant heats and air velocities. 5. Globe temperature is reduced due to increased air velocity, although other thermal components are kept constant. The relationship between globe temperature and air velocity is found. 6. WBGT, WGT and ET* operate in the same manner under varying environmental conditions. The relationship between WBGT and WGT under varying thermal components is developed. 7. HSI does not predict heat stress properly under hot and humid conditions. 8. Accurate prediction of exposure limit to the hot environment can be made by the use of the Predicted Duration Limit Exposure (PDLE) which is developed during this study.Item Identification and Control of Cattle Feedlot Odors(Texas Tech University, 1971-12) Narayan, Raghu SubramaniNot Available.Item Removal of sulfur dioxide from industrial waste gases(Texas Tech University, 1996-05) Tsai, Chien KueiBecause of the wide occurrence of sulfur in fuels and mineral ores, sulfur dioxide (SO2) is one of the most prevalent gaseous air pollutants in stack gases from stationary sources. Removal of SO2 is essential in order to protect the environment. An innovative SO2 removal technology has been experimentally demonstrated to reduce SO2 emissions within regulatory requirements. the SO2 removed from the stack gases can be recovered in the form of marketable liquid SO2. The objective of this research work was to investigate the feasibility of using aqueous buffered phosphate-based solutions for effective SO2 removal from industrial waste gases. Removal efficiency of greater than 99% SO2 and outlet SO2 gas concentration of below 100 parts per million by volume (ppmv) were observed using such solutions. The potential of SO2 desorption was also investigated. Desorption efficiency of 95% SO2 was achieved using such solutions. A 25% enhancement of SO2 loading was further achieved by the addition of trace quantities of adipic acid (H2Ad) as a buffer additive while maintaining SO2 desorption efficiency of greater than 80%. No loss in efficiency was observed in the presence of 30% carbon dioxide, a common stack gas constituent. A 4% net enhancement of overall SO2-removal efficiency considering both absorption and desorption was oberved using phosphate solutions with 0.01 M H2Ad as a buffer additive. These performance measures of SO2 absorption was adequately predicted using mathmetical correlation over a wide range of inlet SO2 concentrations and solution temperatures. Thus, an innovative alternative SO2 removal process using aqueous buffered phosphate-based solutions has been developed with high SO2 absorption and desorption efficiencies. As a result, the proposed phosphate process is more economically attractive than a government-sponsored and publicly demonstrated process treating tail gas from industrial sources. The proposed phosphate process is also economically comparable with the most widely used commercial process treating flue gas from utility sources. A formal patent application has been filed for the invention of this SO2 removal technology.Item Screening technique for hazardous metallic compounds in particulate stack effluents(Texas Tech University, 1974-05) Lin, Pui-NangNot available