Fate and remediation of mixed contaminants in soil Cr ni pesticides and pahs

Abstract

With the pollutant analogues from geothermal and volcanic activities, comets and newlinespace dust which are about 100 t of organic dust per day, the earth is forever a polluted newlineplanet. In this context, soil receives a number of pollutants. It is very common arising mixed newlinecontamination in sewage discharged soils. Benzo (and#945;) Pyrene is high molecular weight newlinepolyaromatic hydrocarbon has five fused aromatic rings with high toxic equivalent factor of newline0.001 which commonly found in the sewage soil. Recent studies revealed that sewage soil newlinegenerally coexisted with organic and inorganic pollutant for instance B(and#945;)P coexisted with Cr newlineand Ni. Availability of this Cr and Ni were generally affecting the microbial mineralization of newlineorganic substance. Hence, studies support that degradation of B(and#945;)P is largely affected by Cr newlineand Ni availability in soil solution. In the above context, the present research intends to study newlinemicrobial remediation of these mixed contaminated soils. Microbial remediation of mixed newlinecontamination of B(and#945;)P, Cr and Ni was studied by firstly, screening of heavy metals for newlinesewage soils, follows kinetic experiments on heavy meals in polluted soil and thirdly, newlineisolation and enrichment of isolation microorganisms subsequent degradation studies. newlineScreenings of heavy metals in sewage contaminated soils were studied in major newlinecorporation of Tamil Nadu namely, Ukkadam of Coimbatore, Avaniyapuram of Madurai, newlineRettamalai of Tiruchirapalli, Koymabedu and Nesapakkema of Chennai. Four heavy metals newlinenamely cadmium, chromium, lead and nickel were identified as prominent in soils of newlineAvaniyapuram of Madurai followed by Ukkadam of Coimbatore, Rettamalai of Tiruchirapalli newlineand Koyambedu and Nesapakkam of Chennai. There were 15 poly aromatic hydrocarbons newlineidentified and their results showed that high molecular weight PAHs concentrated more newlinerather than low molecular weight PAHs. The concentration of total PAHs were more 255.519 newlineng g-1 in Avaniyapuram, followed by 141.319 in Ukkadam, 88.371 in Koyambedu, then newline33.493 in Nesapakkam and 26.868