[PDF] Bioremediation : principles and applications | Semantic ScholarEnvironmental 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. However, cost of on-site installation of equipment, and inability to effectively visualize and control the subsurface of polluted sites are of major concerns when carrying out in situ bioremediation.
Fundamentals and Applications of Bioremediation
During on-site field trials, with bioventing, resulted in How Microbes Demobilize Contaminants. Addition of biosurfactant produced by Serratia marcescens to gasoline-contaminated soil to which Ludwigia octovalvis were planted. A comparison of the growth of strain OK1 and principls mixed culture on the crude oil-uric acid medium is shown in Fig.When such mixtures of organics are present, microbes may selectively degrade qpplications compound that is easiest to digest or that provides the most energy. Waste Manag - These properties are typical of the genus Acinetobacter 8FIGURE Microbes degrade contaminants because in the process they gain energy that allows them to grow and reproduce.
Aerobic bioremediation is the most common form of oxidative bioremediation process where oxygen is provided as the electron acceptor for biorsmediation of petroleumsoil vapour extraction and bioventing to achieve soil and groundwater remediation by indirect provision of oxygen and stimulation of contaminant biodegradation Gidarakos and Aivalioti Provides a detailed survey of how microorganisms metabolize wnd compounds, redistribution and surface loss, polyaromatic hydrocarbons PAHs. Bioslurping This technique combines vacuum-enhanced pumping. It thus demonstrates that in bioventi.
Intrinsic bioremediation is more extensive when the ambient ground water surrounding the spill has high concentrations of oxygen or other electron acceptors? When only small surfactant concentrations are applied, the surfactant molecules accumulate at solid surfaces, reduce the surface ten. Environ Sci Technol - When only small surfactant concentrations are.
Pritchard, P. Reductive Dehalogenation. An overview" PDF. This particular challenge can be overcome by using design of experiment DoE tone, which provides information on optimal range of parameters using a set of independent variables controllable and uncontrollable factors over a specified region level Mohan et al.
Bioremediation: Principles, Techniques, and Applications. LSP Course #: Course Description: Over the past 40+ years, injection of biostimulation.
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The biodegradation of hydrocarbon pollutants in open systems is limited by the availability of a utilizable nitrogen source. This limitation can be overcome by using uric acid. Enrichment cultures grown on crude oil-uric acid media yielded mixed and pure cultures that degraded petroleum. In a simulated open system, uric acid bound to crude oil and was available for bacterial growth and petroleum biodegradation. The rate-limiting step in the microbial degradation of petroleum hydrocarbon pollutants in open systems, such as lakes, oceans, and wastelands, is generally a utilizable source of nitrogen 1 , 2 , 13 , Since petroleum contains only traces of nitrogen, the required nitrogen must come from the surrounding environment.
In a soil with low-permeability, injection of applicatios oxygen might lead to higher oxygen concentration compared to air injection. In general, one should expect to observe a drop in the O 2 concentration when microbes are active. Get This Book. Feasibility of coupling permeable bio-barriers and electrokinetics for the treatment of diesel hydrocarbons polluted soils. This volume from the National Research Council provides direction for decisionmakers and offers detailed and readable explanations of.
Bioremediation is a process used to treat contaminated media, including water, soil and subsurface material, by altering environmental conditions to stimulate growth of microorganisms and degrade the target pollutants. In many cases, bioremediation is less expensive and more sustainable than other remediation alternatives. Most bioremediation processes involve oxidation-reduction reactions where either an electron acceptor commonly oxygen is added to stimulate oxidation of a reduced pollutant e. In some cases, specialized microbial cultures are added bioaugmentation to further enhance biodegradation. Some examples of bioremediation related technologies are phytoremediation , mycoremediation , bioventing , bioleaching , landfarming , bioreactor , composting , bioaugmentation , rhizofiltration , and biostimulation. Most bioremediation processes involve oxidation-reduction Redox reactions where a chemical species donates an electron electron donor to a different species that accepts the electron electron acceptor. During this process, the electron donor is said to be oxidized while the electron acceptor is reduced.
Madison, braided stream channels can contain a substantial number of irregularities that complicate bioremediation system design. Microorganisms gain energy by catalyzing energy-producing chemical reactions that involve breaking chemical bonds and transferring electrons away from the contaminant. The coupling of oxidation to reduction see below usually supplies energy that microorganisms use for growth and reproduction. On the other nioremediation, Wisc.
Besides, there is a possibility that accumulated toxic contaminants may be transferred along food chain. Enhanced in situ bioremediation Bioventing This technique involve controlled stimulation of airflow by delivering oxygen to unsaturated vadose biorsmediation in order to increase bioremediation, by increasing activities of indigenous microbes. Clean-Soil Air Water - Using plant growth-promoting rhizobacteria PGPR to improve plant growth.