Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"pentachlorophenol"”.
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Acclimation of activated sludge to pentachlorophenol
… acclimated to dextrose and then to low levels of pentachlorophenol. The metabolic activity of activated sludge was evaluated by its specific rate of dextrose uptake, Δs/Δt/X (measured by COD removal). Depression of the specific uptake rate, resulting from batch experiments in which the activated …
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Degradation of pentachlorophenol by anaerobic subsurface microorganisms
… of contamination had the ability to degrade pentachlorophenol (PCP) in anaerobic enrichment cultures. Increasing concentrations of PCP in nitrate, sulfate and yeast extract-mineral salts media were used to acclimate the cultures. Nitrate enrichments, previously incubated in an anaerobic …
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Sorption of pentachlorophenol to humic acids and subsequent effects on biodegradation and solvent extraction
… understanding of the sorption and desorption of pentachlorophenol to soil organic matter. In order to separate the reactions controlling the interactions with the soil organic matter from those associated with mineral surfaces, these experiments used only humic acids extracted from soil samples. …
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Native New Zealand fish: lethal and sublethal effects of pentachlorophenol on early and adult life stages
… Zealand freshwater fish species to 99.5% pure pentachlorophenol was studied. For one part of the study, four early life stages of smelt (Retropinna retropinna), inanga (Galaxias maculatus), koaro (Galaxias brevipinnis), and common bully (Gobiomorphus cotidianus) were exposed to …
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Regulation of the MexAB-OprM Multidrug Efflux System of Pseudomonas aeruginosa: Involvement of Pentachlorophenol and Plant Chemicals
… efflux system are upregulated in response to pentachlorophenol (PCP), a phenolic compound that is a common environmental contaminant. Induction of mexAB-oprM and PA3720-armR by PCP was confirmed using RT-PCR, and MexAB-OprM was shown to be involved in PCP resistance. An electromobility shift …
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Foam-surfactant technology in soil remediation
… this technology for the removal of contaminants (Pentachlorophenol, "PCP") from soil and the principal factors that influence the removal efficiency were investigated. The fate and transport of pentachlorophenol, (aromatic pesticide and is mostly used as a wood preservative) was studied in the …
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Microbial degradation of selected aromatic compounds in a hazardous waste site
… dibenzofuran, fluorene, naphthalene, and pentachlorophenol--were contaminants found in the soil and ground water. There was degradation of the selected compounds in the subsurface soil, although the importance of biological activity was not conclusively shown. Microbes in the ground water …
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Adsorption and dechlorination of chlorophenols under acidogenic conditions
… (CCl4), 2,4,6-trichlorophenol (2,4,6-TCP) and pentachlorophenol (PCP). CCl4 was degraded to dichloromethane without the need for acclimation. Dechlorination of 2,4,6-TCP to 4-chlorophenol under acidogenic conditions was only successfully induced by manipulating the start-up procedure of the …
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Removal of organic contaminants from groundwater by reverse osmosis
… 2-chlorobiphenyl, 2,4,6 trichlorophenol, and pentachlorophenol- and four volatile compounds - trichloromethane, bromodichloromethane, dibromochloromethane, and trichloroethene - as single and multi-solute contaminants. The objectives of the experiments were to determine if poly(ether/urea) …
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Investigating the Functional Response of a Subsurface Biofilm Community to Xenobiotic Stress
… potassium efflux (GGKE), to benzene, pentachlorophenol (PCP), or Cd exposure were studied in up-flow sand columns to examine the contribution of each response to the overall functional response of a subsurface biofilm. Benzene was catabolized in the aerobic zone, and did not activate …
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Hydrogen transfer in hydrogen bonded solid state materials
… has been studied. For the molecular complexes of pentachlorophenol with the series of dimethylpyridines, a correlation is established between the dissociation constants determined in solution and the degree of hydrogen transfer from phenol to the pyridine bases in the solid state. The influence of …
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Exploratory studies in the use of microwave radiation to assist the extraction of pollutants from various matrices.
… effective method for quantitative recovery of pentachlorophenol (PCP) from a spiked soil. Recovery of PCP with microwave assisted extraction provided no enhancement. An explanation for this is provided in Chapter 3. Changes in the composition of aromatic solvents in the presence of charcoal and …
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Factors affecting binding of chlorophenols to soil
… (MCP), 2,4,6-trichlorophenol (TCP), and pentachlorophenol (PCP) indicated a statistically significant difference in the degree of nonextractable binding in oxic and anoxic environments. Soils were extracted with water and methylene chloride. The extracted soils were combusted at 950°C and …
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An evaluation of the radiorespirometric technique as a method for detecting changes in heterotrophic activity
… of a toxified sample to a control. The effect of pentachlorophenol (PCP) on the heterotrophic activity of a laboratory-maintained aquatic culture was evaluated. The radiorespirometric technique detected changes in the heterotrophic activity for shorter exposure times and for PCP concentrations an …
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The Growth of Streptomycetes and Fungi Under Controlled Conditions on the Surface of Coated Materials
… protected by one of three biocides; sodium pentachlorophenol, tributyltin oxide or salicylanilide, were evaluated under controlled conditions. Estimation of biocide efficiency and Streptomyces spp. tolerance were determined visually and by tensile strength testing of inoculated textile …
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Rapid reductive dechlorination of environmentally hazardous aromatic compounds and pesticides
… such as polychlorinated biphenyls (PCBs), pentachlorophenol (PCP), p,p'-DDE and Toxaphene, have been widely used in industry and agriculture for more than fifty years. Although they have served their purpose very effectively and at low cost, many of these compounds have been banned in the …
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Development and Standardization of a Short-Term Assay for Evaluating Polluted Estuarine and Coastal Environments: The Medaka Embryo-Larval Assay
… chemicals were initially evaluated with two, pentachlorophenol (PCP) and tributyltin chloride (TBTCl), subsequently selected for extensive evaluations of salinity tolerance and the accuracy of the topical exposure method for representing a typical immersion exposure. The amount of material …
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Elucidating the Role of Toxin-Induced Microbial Stress Responses in Biological Wastewater Treatment Process Upset
… chemicals at all concentrations tested (cadmium, pentachlorophenol, and acetone) or heat stress. As total cadmium concentrations increased above 5 mg/L, there was a significant and consistent increase in effluent volatile suspended solids concentrations from activated sludge sequencing batch …
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