Tag: Biodegradation

Recent Articles-IJES

A pilot study on the biodegradation of hydrocarbon and its kinetics on kerosene simulated soil
Author(s)- Akpoveta O.V., Egharevba F., Medjor O.W.

ABSTRACT

A pilot study was carried out on soil from the Niger Delta region of Southern Nigeria, contaminated with kerosene by 10% artificial simulation to determine the attendant effect associated with the soil physicochemical properties and microbiological composition. Biodegradation of the contaminant using soil microbes biostimulated with a blend of animal wastes and the kinetics of such process was also investigated. Soil parameters such as pH, electrical conductivity, total organic carbon and matter, total nitrogen and phosphorus, texture, heavy metals(Cd, Pb, Ni, V and Cr) and total petroleum hydrocarbon (TPH) were characterized using standard analytical methods. Trend in growth phase of soil heterotrophic and hydrocarbon utilizing microbes were investigated. Kerosene contamination was seen to affect certain soil properties as a reduction in pH, conductivity, total phosphorus and heterotrophic microbial population was observed, while an increase in the concentration of heavy metals such as Nickel, Vanadium and Chromium were recorded. Other soil properties were unaffected by the impact of kerosene. The rate of microbial degradation was found to be dependent on pH and nutrient source. Effective degradation and increased microbial growth occurred between between pH 6.0 and 9.5 but recorded reduced microbial growth and biodegradation rate at much higher pH thereby defining a suitable pH condition for the process. The method was found to be very effective and efficient as an impressive 82.24 % remediation efficiency was achieved on the sixth week. Kinetic evaluation of the biodegradation process shows that the degradation pattern followed first order with a rate constant of 0.034day-1. A determination of the biodegradation isotherm Kd gave negative value of unity showing the opposing trend between the concentration of the contaminant in the soil (Cs) and the concentration degraded by the microbes (Cd); which explains that as Cs is decreasing with time, Cd is increasing.

Read full text

Advertisements

Recent Articles-IJES – Article removed due to conflict of interest

Studies on settling characteristics and Bio-chemical parameter reduction in paper mill effluent with microbial flocs

This article is removed from the journal due to conflict of interest raised by the third party and with the subsequent findings confirmed that its not the original work of authors. Editors of this journal and the reviewers deeply regret for the inconvenience caused to the original researchers and also authors are advised to publish articles only after getting prior permission from all concerned.

Recent Articles-IJES

Biodegradation of Azo Dye by Listeria Sp
Author(s)- Kuberan.T, Anburaj.M, Sundaravadivelan.C, Kumar.P

ABSTRACT

In this study azo dye degrading bacteria was isolated from various textile industries in and around Rajapalayam. The four bacterial strains effectively degrading the textile dyes were isolated, screened and analyzed. The toxic level of the dye and its metabolites were successfully estimated and it was found that the concentration of the protein in the culture increases with the increase in the concentration of the dye. Thus the stress is the main reason for the production of protein which in turn responsible for degradation. Phytotoxicity study was conducted in rice seed and monitoring the germination and growth rate of the seed. The results indicated  that the  growth of the plant is arrested when the seeds are soaked in the dye. Seed germination of the rice have a very low growth and germination rate with respect to the concentration of the dye and the degraded products showed  higher in toxic level . This confirms the formation of toxic aromatic amines. Finally biochemical analysis was done for the identification of the bacterial strains responsible for the degradation of the dyes. Among the four screened isolates Listeria sp., was found to be more effective.

Read full text