Biological Aspects Involved in the Degradation of Organic Pollutants

Díez, M.C.

doi:10.4067/s0718-95162010000100004

Cited by 135 publications

(69 citation statements)

References 123 publications

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“…Figure 2b. Phenoloxidase activity has been reported as the most important biological activity for contaminant degradation in soil (Briceño et al, 2007;Diez, 2010) and in the biomixture of the biobed system (Castillo et al, 2008) (Chaudhry et al, 2005).…”

Section: Dissipation Of Atz Chl and Ispmentioning

confidence: 99%

Influence of the rhizosphere in a biopurification system on the dissipation of a pesticide mixture

Urrutia

Rubilar

Castillo

et al. 2015

J. Soil Sci. Plant Nutr.

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In a biopurification system such as a biobed, the rhizosphere of the grass layer may be a significant factor for promoting pesticide dissipation in the biomixture. The rhizosphere effect of a Lolium perenne, Festuca arundinacea and Trifolium repens mixture on the dissipation of a pesticide combination that was composed of atrazine, chlorpyrifos and isoproturon was studied. The assay was performed using glass pots divided into two separate compartments (root surface and root-free), each filled with an organic biomixture (oat husk, top soil and peat) and contaminated with the pesticide mixture at 5 mg kg -1 . Non-planted and noncontaminated pots were also used as controls. The results indicated that there were high atrazine, chlorpyrifos and isoproturon dissipation in the planted pots compared with the unplanted pots. An inverse correlation was found throughout the assay between phenoloxidase activity and residual pesticide (r=0.684 to 0.952). Indeed, fungal biomass was positively correlated with phenoloxidase activity on day 1 (r =0.825) and day 30 (r =0.855). Besides, exudation of oxalic and malic acid in contaminated pots was higher than in the control without pesticides, associated with oxidation of the pesticide mixture in the biomixture of a bioded system. Therefore, the grass layer enhances pesticide removal in biobeds.

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Section: Dissipation Of Atz Chl and Ispmentioning

confidence: 99%

Influence of the rhizosphere in a biopurification system on the dissipation of a pesticide mixture

Urrutia

Rubilar

Castillo

et al. 2015

J. Soil Sci. Plant Nutr.

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“…However, soil plays an important role in pesticide degradation (Castillo et al, 2008;Diez, 2010;Maya et al, 2011). The effect of soil types used for biomix preparation was studied by Fogg and Boxall (2004).…”

Section: Introductionmentioning

confidence: 99%

Chlorpyrifos degradation in a Biomix: Effect of pre-incubation and water holding capacity

Fernández-Alberti

Rubilar

Díez

2012

J. Soil Sci. Plant Nutr.

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Biobed system is a simple method to minimize point source contamination during manipulation of pesticides and is based on the adsorption and degradation potential of a biomix composed by top soil, peat, and straw and covered with a grass layer. In our study, the biomix was prepared with Andisol, peat and straw in a volumetric proportion of 1:1:2, and adsorption and degradation studies were done. Degradation of chlorpyrifos (160 mg a.i. kg -1 ) and formation of TCP (3, 5, 6-trichloro-2-pyrinidol) at different pre-incubation times (0, 15 and 30 days) and with different moisture contents (40, 60 and 80 % of water holding capacity) were evaluated, ligninolytic enzyme activity and microbial respiration in the biomix were periodically analyzed. Adsorption isotherms were fitted using Freundlich and linear models for Andisol and the biomix. The adsorption assays demonstrated that biomix has a higher capacity to retain chlorpyrifos than top soil. The pre-incubation period, WHC and the concentration of the chlorpyrifos of the biomix influenced the degradation of the contaminant and TCP formation as well as the biological activities in the biomix. The TCP was formed during the first steps of chlorpyrifos degradation and was later degraded in the biomix under all studied conditions. In conclusion, biomix with Andisol, peat and straw (1:1:2), pre-incubated by 15 days and incubated with 60% of WHC is capable to degrade chlorpyrifos efficiently.

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“…Worldwide use of pesticides has increased dramatically during the last two decades. [1] Presently, >600 different pesticide formulations are being used in our environment. Due to the widespread use of pesticides, their residues are found in the environment.…”

Section: Introductionmentioning

confidence: 99%

Interface interactions between insecticide carbofuran and tea waste biochars produced at different pyrolysis temperatures

Mayakaduwa

Vithanage

Karunarathna

et al. 2016

Chemical Speciation & Bioavailability

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Biochars showed a potential as adsorbents for organic contaminants, however, have not been tested for carbofuran, which has been detected frequently in water. This study provides evidences for the use of infused tea residue derived biochar for carbofuran removal. Biochars were produced at 300, 500 and 700 °C by slow pyrolysis and were characterized by proximate and ultimate analysis, FT-IR, SEM, BET and pore size distribution. Pyrolysis temperature showed a pronounced effect on biochar properties. The maximum carbofuran removal was achieved at pH 5. Freundlich and Temkin models best fit the equilibrium data. Biochars produced at 700 °C showed the highest sorption intensity. The adsorption process was likely to be a favorable chemisorption process with electrostatic interactions between carbofuran molecules and biochar surface. Acid-base interactions, electrophilic addition reactions and amide bond formations are the possible mechanisms of carbofuran adsorption. Overall, biochars prepared from tea waste can be utilized as effective adsorbents for removal of aqueous carbofuran.

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Biological Aspects Involved in the Degradation of Organic Pollutants

Cited by 135 publications

References 123 publications

Influence of the rhizosphere in a biopurification system on the dissipation of a pesticide mixture

Influence of the rhizosphere in a biopurification system on the dissipation of a pesticide mixture

Chlorpyrifos degradation in a Biomix: Effect of pre-incubation and water holding capacity

Interface interactions between insecticide carbofuran and tea waste biochars produced at different pyrolysis temperatures

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