by U.S. Environmental Protection Agency, Office of Research and Development, Office of Solid Waste and Emergency Response in [Washington, D.C.?] .
Written in English
|Statement||Ann Azadpour-Keeley, Hugh H. Russell, and Guy W. Sewell|
|Series||Ground water issue|
|Contributions||Russell, Hugh H, Sewell, Guy W, United States. Environmental Protection Agency. Office of Research and Development, United States. Environmental Protection Agency. Office of Solid Waste and Emergency Response, Superfund Technology Support Center for Ground Water (Robert S. Kerr Environmental Research Laboratory)|
|The Physical Object|
|Number of Pages||18|
Ground Water Issue: Microbial Processes Affecting Monitored Natural Attenuation of Contaminants in the Subsurface Author: A. Azadpour-Keeley, H. Russell, and G. . Decisions to employ monitored natural attenuation (MNA) as a remediation strategy at contaminated field sites require a comprehensive characterization of the site-specific biodegradation processes. In the present study, compound-specific carbon and hydrogen isotope analysis (CSIA) was used to investigate intrinsic biodegradation of benzene and ethylbenzene in an aquifer with high levels . FILIP Z., DEMNEROVA K. () MICROBIAL RESISTANCE TO CHEMICAL CONTAMINANTS - AN ESSENTIAL PRECONDITION OF NATURAL ATTENUATION IN GROUNDWATER AQUIFER. In: Dura G., Kambourova V., Simeonova F. (eds) Management of Intentional and Accidental Water Pollution. NATO Security through Science by: 5. Conceptual illustration of the important natural attenuation processes that affect the fate of petroleum hydrocarbons in aquifers: Use of monitored natural attenuation as a remediation strategy involves filing a formal regulatory application to allow natural biological, chemical, and physical processes to treat groundwater contaminants, and.
Slower, lower energy yield degradation processes such as ferric iron reduction, bacterial sulphate reduction (BSR) and methanogenesis (Conrad et al., ) may be important in long-term pollutant attenuation, but the time-scale of most monitoring programmes precludes assessment of the degradation rate. Microbial contamination is defined as “deterioration of pharmaceutical products by the contaminant microbes”. The contaminating microorganisms may cause spoilage of the product with loss of its therapeutic properties and, if they are pathogenic, serious infections can arise. Sources of Microbial Contaminants. appearance (turbidity), pH, and DO (Dissolved Oxygen). Microbial contamination of a microbial cell reactor is more difficult to detect, but no less of an issue. A common type of contamination at the cell culture level is caused by Mycoplasma, the smallest self-replicating prokaryote. These lack a cell wall, as well as the ability to synthesize one. An improvement of food service centers in recent years has been made based on the implementation of the principles of the Hazard Analysis and Critical Control Points (HACCP) system. Food safety preventive measures have been focused on training of handlers in hygiene practices and on improving the sanitary quality of meals. In Europe, an increasing trend in foodborne outbreaks has been.
Global methane (CH 4) emissions are becoming increasingly important due to the contribution of CH 4 to global warming. Leaking oil and gas wells can lead to subsurface CH 4 gas migration (GM), which can cause both aquifer contamination and atmospheric emissions. Despite the need to identify and quantify GM at oil and gas well pads, effective and reliable monitoring techniques are lacking. Detection and Monitoring of Microbiological Contaminants Protecting groundwater from microbial contamination is a top public health priority. The United States and Canada experience significant levels of gastrointestinal disease from drinking water, more than 70 percent of which is associated with contaminated well water. Natural attenuation processes involve contaminant atten- The microbial transformation of contaminants in soils. but in the process affect several soil parameters like fertility and. 5 Chemical Methods of Microbial Control Types of Disinfectants 2. Halogens: Effective alone or in compounds. B. Chlorine: u When mixed in water forms hypochlorous acid: Cl 2 + H 2 O > H+ + Cl- + HOCl Hypochlorousacid u Used to disinfect drinking water, pools, and sewage. u Chlorine is easily inactivated by organic materials. u Sodium hypochlorite (NaOCl): Is active ingredient of.