3,299 research outputs found
MERCURY ORBIT CHART MOC-3
No full textThe following note accompanies this map and is signed by Walter: "This chart was given to me September 20, 1995 by Dr. John E. Dornbach of Seabrook, Texas. This is one of the two charts carried by Col. John H. Glenn on the first U.S. manned orbital flight in the Project Mercury Gemini capsule Friendship 7, February 20, 1962. The three-orbit flight covered approximately 130,000 km. in 4 hours, 55 minutes. Dr. Dornbach was the person responsible for producing this chart for Aeronautical Chart and Information Center at that time. Later he was transferred to N.A.S.A. to produce the Lunar lander maps and ultimately became the Director of the Earth Resources branch at NASA. John Dornbach was a classmate of mine in the Geography Graduate School at Clark University, Worcester, Mass. in 1950-52. Walter K. Morrison.
PHARMACEUTICAL COMPOUND REMOVAL DURING MIXED LIQUOR FILTRATION IN MEMBRANE BIOREACTOR OPERATED UNDER LONG SLUDGE AGE
No full textRemovals of 10 pharmaceutical compounds by different size particle fractions in the mixed liquor of a membrane bioreactor (MBR) operated under infinite solid retention time (SRT) were investigated. The distribution of pharmaceutical compounds of different particle size fraction in the mixed liquor of MBRs sludge was determined by fractionating the particles into different size fractions by using different separation techniques. Permeate obtained from each membrane filter was analyzed for residual concentration of pharmaceut8cal compounds using LC-MS/MS and HPLC-UV/Vis analyses. High removals (>80%) of DCF, TMP, NPX, IBP and TCS were observed but CBZ removals were low (<40%). Adsorption onto coarse particle (>0.45 µm) was the major phenomena responsible for the removal of hydrophobic compounds while adsorption onto fine particles and gel-like substances (1 kDa-0.45 µm) contributed significantly to the removals of hydrophilic and moderate hydrophobic compounds. The Majority of pharmaceutical compounds except CBZ and SMX could be adsorbed onto fine particles and gel-like substances and subsequently rejected during membrane filtration in the MBR. Operation of the MBR at high sludge concentration under long sludge age condition helped enhancing the removals of several pharmaceutical compounds via adsorption onto coarse and fine particles.</jats:p
Performance of membrane separation bioreactor at various temperatures for domestic wastewater treatment
No full textBiodegradation of plastic wastes under semi-aerobic condition with active methane oxidation activities and nutrient supply
No full textElimination of plastic waste deposition in landfills is essential to avoid secondary pollution such as microplastics. Under appropriate environments, methanotrophs which proceed through methane oxidation reaction are capable of degrading plastics via their co-metabolisms. Nevertheless, nutrient conditions in landfills to promote methane oxidation and plastic degradation are still unclear. Therefore, the biodegradation of plastic wastes under semi-aerobic conditions with methane oxidation activities and nutrient additions was examined in this study. Various types of plastics (HDPE, LDPE, oxo-degradable plastics) were exposed to methane and air under semi-aerobic conditions in lysimeters where methanotrophic activities were promoted. Nitrate and phosphate and their combination were introduced into waste mixtures to determine their effect on plastic biodegradation. Changes in gas compositions, plastic weight losses, by-products, and microbial consortium were studied. Phosphate supplement resulted in higher methanotrophic population, particularly that of type I (Methylococcus sp., Methylocaldum sp., Methylovorus sp., Methylomonas sp., and Methylobacter sp.) and yielded highest biodegradation for oxo-degradable (15-20%) followed by HDPE (15-19%), and LDPE (4–7%). The plastic degradation was found well correlated to methane oxidation rate. Oppositely, nitrate supplements reduced MOR due to their competition with oxygen for microbial reactions. Semi-aerobic condition with a phosphate supplement is found effective in promoting plastic degradation in landfills
Performance of soil and compost mixture in leachate purification at intermediate cover soil of tropical landfill
No full textEmissions of Volatile Organic Compounds from Solid Wastes and Leachate at a Municipal Solid Waste Dumpsite in Thailand
No full textColiform Removal in Membrane Bioreactor and Disinfection during Hospital Wastewater Treatment
Get PDFThis study investigated coliform removal from hospital wastewater in a membrane bioreactor (MBR) and disinfection using either chlorine or ozone. A laboratory-scale MBR equipped with a hollow-fiber membrane module was operated with hydraulic retention times varied at 3 and 6 hours. The disinfection of MBR effluent was carried out using either chlorine or ozone with concentrations varied between 1 and 10 mg/l and contact time varied between 1 and 30 min. During 150 days of MBR operation, organic removal efficiencies averaged 96.5% and 97.7% for BOD and 73.6% and 84.1% during its operation at an HRT of 3 and 6 hours respectively. Simultaneously, 6.7 and 6.4 log reduction of total coliforms and 6.2 and 6.1 log reduction of E. coli were achieved under these respective HRT conditions. The use of chlorine for disinfection of MBR effluent could eliminate total coliforms and E. coli completely at >6 and 3 mg/L at 30 min contact time, whereas only >3 and 1 mg/L was required for ozone at the same contact time. There was a significant improvement of disinfection efficacy of solid-free MBR effluent compared to that of activated sludge effluent
Exploring Effective Bio-Cover Materials for Mitigating Methane Emission at a Tropical Landfill
No full textMethane emission and oxidation in different bio-cover materials, i.e., sandy loam, compost, and stabilized wastes, were investigated at a municipal solid waste landfill in Thailand. The bio-cover was purged with extracted landfill gas while methane reduction through biological oxidation was studied. The moisture content in bio-cover materials was maintained with natural rainwater during the wet period and leachate irrigation during the dry period. Methane emissions were found to vary between media and were influenced by rainfall. The methane loading rates of the bio-cover varied from 8.2–20.3 mol/m3/d, being higher during the dry period. Methane removal rates at the bottom part of the biofilter (0.4–0.6 m depth), the most active zone, were found to be from 6.4–10.9 and 7.8–11.4 mol/m3/d during wet and dry periods. The highest methane removals were found in the lower part of sandy loam, followed sequentially by compost and stabilized wastes. Nevertheless, compost had the highest methane oxidation capacities and greater methanotroph population compared to sandy loam and stabilized wastes. Methanotroph type I was found to predominate during the dry period, whereas methanotroph type II was predominant during the wet period
Organizational chart
No full textThis archived document is maintained by the Oregon State Library as part of the Oregon Documents Depository Program. It is for informational purposes and may not be suitable for legal purposes.Title from PDF caption (viewed on November 10, 2014)"Updated: 09/22/2014."Mode of access: Internet from the Oregon Government Publications Collection.Text in Englis
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