Tag: Bioremediation

Recent Articles-IJES

Crude oil PAH constitution, degradation pathway and associated bioremediation microflora: an overview
Author(s)- Kumar Arun, Munjal Ashok, Sawhney Rajesh

ABSTRACT

Crude oil, a dark sticky liquid, is a complex mixture of varying molecular weight which is used for the preparation of petroleum products. Crude oil contains more than 30 parent polyaromatic hydrocarbons (PAHs). The U.S.EPA has designated 16 PAH compounds (naphthalene, acenaphthylene, acenaphthene, fluorene, phenenthrene, anthracene, fluoranthene, pyrene, benz[a]anthracene, chrysene, benzo[b]fluoranthene, benzo[k]fluoranthene, benzo[a]pyrene, dibenz[a, h]anthracene, benzo[g, h, i]perylene, and indeno[1,2,3-cd]pyrene) as priority pollutants. PAHs are one of the most widespread organic pollutants and potentially health hazard. Besides other environmental components, they are also found in foods (cereals, oils, fats, vegetables, cooked meat). They are carcinogenic , mutagenic , and teratogenic . Thus, key focus is to eliminate these hazardous pollutants from the environment. The present review highlights the presence of various PAHs in the crude oil, key metabolic pathway for the degradation and the associated microbial degraders. The current approach to bioremediation uses various bacterial and fungal genera under aerobic or anaerobic conditions to directly target the specific PAH. However, there is need to explore newer approaches to design an efficient, effective and ecofriendly bioremediation tool. The dearomatization of crude oil might be a useful comprehensive approach and one shot solution to multiple PAH population.

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Recent Articles-IJES

Studies on bioremediation of Phenol by earthworm
Author(s)- Mohan Krishna.V et al.,

ABSTRACT

Three species of earthworms namely Eisenia foetida, Eudrillus eugenia and Anantapur species were procured from different institutions. They were tested for their tolerance to phenol and   bioremediation activity. The bioremediation assays were performed in soil with phenol dispersed in water. Different concentrations of phenol samples ranging from 20 to 100ppm were taken for experimentation. The remediation process of initial phenol concentration was investigated. The results indicated that Eisenia foetida and Eudrillus eugenia were the best tolerant species, while the Anantapur species was found to be least tolerant. As the initial concentration of phenol increased, there was an increase in the percentage of bioremediation with respect to Eisenia foetida.But with species Eudrillus eugenia and Anantapur species, the percentage of uptake of phenol at 24 hours decreased with increase in initial phenol concentration. This indicates that the species Eisenia foetida is most tolerant species since it is able to uptake 100ppm phenol completely with in 72hours.

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Recent Articles-IJES

Review on Bioremediation of Polluted Environment: A Management Tool
Author(s)- Kumar.A, Bisht.B.S, Joshi.V.D, Dhewa.T

ABSTRACT

The term bioremediation has been introduced to describe the process of using biological agents to remove toxic waste from environment. Bioremediation is the most effective management tool to manage the polluted environment and recover contaminated soil. Bioremediation is an attractive and successful cleaning technique for polluted environment. Bioremediation has been used at a number of sites worldwide, including Europe, with varying degrees of success. Bioremediation, both in situ and ex situ have also enjoyed strong scientific growth, in part due to the increased use of natural attenuation, since most natural attenuation is due to biodegradation. Bioremediation and natural attenuation are also seen as a solution for emerging contaminant problems, e.g. endocrine disrupters, landfill stabilization, mixed waste biotreatment and biological carbon sequestration. Microbes are very helpful to remediate the contaminated environment. Number of microbes including aerobes, anaerobes and fungi are involved in bioremediation process.

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Recent Articles- IJES

Evaluation of bioremediation effectiveness on sediments
Contaminated with industrial wastes
Author(s)- Aparna.C et al.,

ABSTRACT

A treatability study was conducted to determine the most effective bioremediation strategies for the decontamination of sediments dredged from industrially polluted Gandigudem Lake. Microcosm experiments were performed with the addition of a microbial consortium and nutrients. The performance of each treatment was examined by monitoring biological parameters such as basal respiration, microbial biomass carbon (Cmic), metabolic quotient (qCO2), Cmic/TOC ratio, dehydrogenase activity, and phytotoxicity. Results of the study suggest that the addition of nutrients to the contaminated sediments accelerated bioremediation and the application of an enriched native microbial consortium in concentration greater than the indigenous microbial population further increased the bioremediation efficiency. The study also demonstrated the effectiveness of combining bioassays with chemical monitoring for evaluation of bioremediation effectiveness and assessment of the de-contaminated/ stabilized sediments.

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