Earthworms and Soil Pollutants

Hirano, Takeshi; Tamae, Kazuyoshi

doi:10.3390/s111211157

Cited by 76 publications

(31 citation statements)

References 38 publications

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“…Earthworms present in an ecosystem have also been shown to decrease the severity of the soil borne bacterial and fungal plant diseases [5,2]. They are also being used as key bio indicator organisms for testing the toxicity of chemicals and pollutants in soil [6,7,8,9,10,11]. Earthworms can be used in waste management, preparation of biofertilizer through vermicomposting, minimization of environmental pollution through vermicomposting, bioaccumulation of toxic residues agrochemicals (metals) and in medicine in the treatment of wound, piles, chronic boils, sore throat, hernia, respiratory ailments, jaundice and rheumatic arthritis [12,3].…”

Section: Introductionmentioning

confidence: 99%

Observations On The Ecology Of Earthworms And Its Effect On The Population Dynamics Of Cellulolytic Bacteria In Soils Across Selected Habitats In Imo State University Main Campus Owerri, Nigeria

Ogbonna¹

2013

IOSR-JESTFT

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Section: Introductionmentioning

confidence: 99%

Observations On The Ecology Of Earthworms And Its Effect On The Population Dynamics Of Cellulolytic Bacteria In Soils Across Selected Habitats In Imo State University Main Campus Owerri, Nigeria

Ogbonna¹

2013

IOSR-JESTFT

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“…Studies have shown that earthworms have a high potential for biological bioremediation of contaminated soils (Suthar et al, 2008;Nahmani et al, 2009;Li et al, 2010;Hirano and Tamae, 2011). These organisms can accumulate a high concentration of heavy metals in the body (Shahmansouri et al, 2005;Li et al, 2010;Brewer and Barrett, 1995;Bamgbose et al, 2000) Based on statistical analysis performed in this study, it was found that, due to the high toxicity of chromium for worms, there was a significant correlation between the concentration of chromium in soil and earthworm mortality, (PV <0.05).…”

Section: Discussionmentioning

confidence: 99%

EFFICIENCY OF THE EARTHWORM Eisenia fetida UNDER THE EFFECT OF ORGANIC MATTER FOR BIOREMEDIATION OF SOILS CONTAMINATED WITH CADMIUM AND CHROMIUM

Mostafaii

Aseman

Asgharnia

et al. 2016

Braz. J. Chem. Eng.

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-The use of earthworms to bioremediate soil results in decreasing the pollutant concentration through a bioaccumulation mechanism of the contaminants in the earthworm's body. The present work is an empirical study that was carried out on soils contaminated with chromium and cadmium. Organic matter in the amount of 5% and 9% of soil weight was added. Chromium and cadmium concentrations in soil and in the body of worms were measured at two time periods of 21 and 42 days. According to the results, increasing from 5% to 9% the organic material of the soil contaminated with chromium at the initial concentration of 0.06 mg/g, the removal efficiency decreased by 5%. In 0.1 mg/g concentration the bioremediation efficiency decreased by 20%, showing that the earthworms probably have more tendency to consume the organic material and low tendency for consuming the soil contaminated by metal. Results showed that, considering the increased mortality of worms in the soil at a concentration of 0.08 mg/g of chromium, using this method is not recommended. For cadmium we require more study, though we can say that the organic material had no influence on the bioremediation of the soil.

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“…Studies have shown that earthworms have a high potential for biological bioremediation of contaminated soils (Suthar et al, 2008;Nahmani, Hodson et al, 2009;Li, Xu et al, 2010;Hirano & Tamae, 2011). However, it has been found that the accumulation of heavy metals in the body of earthworm is partly due to the heavy metal concentrations in soil, Ma et al (1983) reported.…”

Section: Bioremediation Of the Soils Contaminated With Cadmium And Chmentioning

confidence: 99%

Bioremediation of the Soils Contaminated with Cadmium and Chromium, by the Earthworm Eisenia fetida

et al. 2014

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One of the most important environmental problems in the world is the soils contamination by heavy metals in the industrial areas, and especially the contamination of the agricultural lands. The use of earthworms to bioremediate the soils results in reducing the pollutants concentration through a bioaccumulation mechanism on the contaminants in the earthworm's body. Hence, the present study aimed to prove the biological effectiveness of Eisenia fetida earthworms in bioremediation the soils contaminated with chromium and cadmium. Concentration of chromium and cadmium pollution in soil was determined to be 0.04 mg/g and 0.08 mg/g respectively. 30 worms were added to 500 g soil samples. Chromium and cadmium concentration in soil and in the body of worms was measured at two time periods of 21 and 42 days. To measure the concentration of chromium and cadmium we used ICP spectrometry. Software in usage was SPSS version 17. There was a significant correlation between the reduction of chromium and cadmium metals in the soils and the accumulation of chromium and cadmium metals in the worm's body. A significant decline of chromium levels of the soil was observed in the days 21 and 42 during the study compared to initial amount of 0.1 mg/g. on the other hand chromium concentration of the soil decreased from 0.14 mg/g to 0.1 mg/g after 42 days. Comparison of mortality in two different time periods showed that by passing the time and by increase in soil chromium and cadmium concentrations the death toll of worms rises. The increased mortality of worms in the soil at a concentration of 0.08 mg/g of chromium, say that using the worms for bioremediation is not recommended at such concentration of chromium but using the worms for the removal of cadmium at concentrations of 0.04 mg/g and 0.08 mg/g in the soil is recommended. Keywords: Chromium; Cadmium; Eisenia fetida; bioremediation ResumoUm dos problemas ambientais mais importantes do mundo é a contaminação dos solos por metais pesados nas áreas industriais e, principalmente, a contaminação das terras agrícolas. O uso de anelídeos para biorremediar os solos resultam na redução da concentração de poluentes por meio de um mecanismo de bioacumulação dos contaminantes no corpo dos anelídeos. Assim, o presente estudo teve como objetivo comprovar a eficácia biológica dos anelídeos Eisenia fetida em biorremediação dos solos contaminados com cromo e cádmio.A concentração de cromo e cádmio em solo poluídos foi determinadao como sendo 0,04 mg/g , e de 0,08 mg/g respectivamente. Trinta anelídeos foram adicionados a 500 g de amostras de solo. A concentração de cromo e cádmio no solo e no corpo dos anelídeos foi medida em dois períodos, de 21 e 42 dias . Para medir a concentração de cromo e cádmio usamos espectrometria de ICP . O software em uso foi o SPSS versão 17. Houve uma correlação significativa entre a redução dos metais cromo e cádmio nos solos e da acumulação de metais de cromo e cádmio no corpo dos anelídeos. Também houve uma diminuição significativa na concentração de crom...

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Earthworms and Soil Pollutants

Cited by 76 publications

References 38 publications

Observations On The Ecology Of Earthworms And Its Effect On The Population Dynamics Of Cellulolytic Bacteria In Soils Across Selected Habitats In Imo State University Main Campus Owerri, Nigeria

Observations On The Ecology Of Earthworms And Its Effect On The Population Dynamics Of Cellulolytic Bacteria In Soils Across Selected Habitats In Imo State University Main Campus Owerri, Nigeria

EFFICIENCY OF THE EARTHWORM Eisenia fetida UNDER THE EFFECT OF ORGANIC MATTER FOR BIOREMEDIATION OF SOILS CONTAMINATED WITH CADMIUM AND CHROMIUM

Bioremediation of the Soils Contaminated with Cadmium and Chromium, by the Earthworm Eisenia fetida

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