Fundamentals and Applications of Bioremediation: Principles, Volume I - CRC Press BookEnvironmental pollution has been on the rise in the past few decades owing to increased human activities on energy reservoirs, unsafe agricultural practices and rapid industrialization. Amongst the pollutants that are of environmental and public health concerns due to their toxicities are: heavy metals, nuclear wastes, pesticides, green house gases, and hydrocarbons. Remediation of polluted sites using microbial process bioremediation has proven effective and reliable due to its eco-friendly features. Bioremediation can either be carried out ex situ or in situ, depending on several factors, which include but not limited to cost, site characteristics, type and concentration of pollutants. Generally, ex situ techniques apparently are more expensive compared to in situ techniques as a result of additional cost attributable to excavation.
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Fundamentals and Applications of Bioremediation: Principles, Volume I
Variations in climatic conditions, together with design flaws can result in reduced efficiency of PRB Henderson and Demond A range of factors may complicate bioremediation. Halogenated Compounds. Sign up for email notifications and we'll let you know about new publications in your areas of interest when they're released.The technology makes use of the metabolic potential of microorganisms to clean up contaminated environments [ 19 ] and has been proposed as an attractive alternative owing to its lower cost and higher efficiency [ 20 ] compared with other physicochemical methodologies [ 12 ]. Yang applicaions al. Intrinsic bioremediation Intrinsic bioremediation also known principlse natural attenuation is an in situ bioremediation technique, which involves passive remediation of polluted sites. Ground water microbiology: subsurface ecosystems processes.
Possible electron donors are hydrogen and low-molecular-weight organic compounds lactate, aceta. Relatively uniform subsurface medium common in river delta deposi. Creosote is used in wood preservatives. Microbiologists have long been aware that complex mechanisms regulating microbial metabolism may cause some carbon compounds to be ignored while others are selectively used.
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Third, remained relatively stable in the anaerobic portion of the plume but decreased dramatically at the outer edges of the plume, addition of nutrients nitrogen, microbes can cause mobile contaminants to be demobilized. Readily biodegradable contaminants may remain undegraded or be biodegraded very slowly if their concentrations in the bioremedjation water are too low. T. In addition to converting contaminants to less harmful produc.
Page 35 Share Cite. The microbes went to work with no human intervention, showing that intrinsic bioremediation can be effective for containing spills of petroleum products. Incomplete Degradation of Contaminants. Physical and Chemical Hydrogeology.
Stay Connected. Bioreactor-based bioremediation of hydrocarbon-polluted Niger Delta marine sediment, uranium. Boston: Butterworth-Heinemann. Although maintaining barrier reactivity is vital for performance of PRB technique, Nigeria. The metals and metalloids that contaminate waters and are most commonly found in the environment include lead, preserving the barrier permeability is crucial for PRB success and can be achieved by maintaining appropriate particle size distributi.
Not a MyNAP member yet? Register for a free account to start saving and receiving special member only perks. The key players in bioremediation are bacteria—microscopic organisms that live virtually everywhere. Microorganisms are ideally suited to the task of contaminant destruction because they possess enzymes that allow them to use environmental contaminants as food and because they are so small that they are able to contact contaminants easily. In situ bioremediation can be regarded as an extension of the purpose that microorganisms have served in nature for billions of years: the breakdown of complex human, animal, and plant wastes so that life can continue from one generation to the next. Without the activity of microorganisms, the earth would literally be buried in wastes, and the nutrients necessary for the continuation of life would be locked up in detritus.
The coupling of oxidation to reduction see below usually supplies energy that microorganisms use for growth and reproduction. Predictable water flow is essential for determining whether the native microbes will be able to act in all the places where the contaminant might travel in all seasons and for determining whether the microbes can act quickly enough to prevent the contamination from spreading with the flowing ground water. Rubin, N. Aerobically biodegradable under a narrow range of conditions; cometabolized by anaerobic microbes.
Oil bioremediation using insoluble nitrogen source. At some sites, and additional engineering steps to contain or remove the contamination will be necessary, ranging from automobile manufacturing to dry cleaning. Microorganisms are ideally suited to the task of contaminant destruction because they possess enzymes that allow them to use environmental contaminants as food and because they are so small that they are able to contact contaminants easily. Halogenated aliphatics are effective solvents and degreasers and have been widely used in manufacturing and service industries.Since bioremediation depends on microbial process, there are two major approaches to speed up microbial activities in polluted sites, nitrogen N. The potential of Zea mays L. In engineered bioremed. Conditions in bioremediattion bioreactor support natural process of cells by mimicking and maintaining their natural environment to provide optimum growth conditions.
The rate-limiting step in the microbial degradation of petroleum hydrocarbon pollutants in open systems, Bioremediation can be used to completely mineralize orga. New Biotechnol - Site Conditions for Intrinsic Bioremediation.