Comparison of heavy metals content in compost against vermicompost of organic solid waste: Past and present

Mohee, Romeela; Soobhany, Nuhaa

doi:10.1016/j.resconrec.2014.07.004

Cited by 75 publications

(17 citation statements)

References 91 publications

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“…The metal levels in the excavated product were comparable to mean metal concentrations in municipal solid waste compost reported in the literature (30,55). As regulations are based on risk assessment, the potential for metals being a hazard in the use of this product may be limited (56). Of all potential quality standards for composts and biocomposts, heavy metals have been the focus of most considerations.…”

Section: Heavy Metals Content Of Final Productsupporting

confidence: 61%

Maturity and Stability Evaluation of Composted Municipal Solid Wastes

et al. 2016

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Background: Composting process is a feasible biological treatment for the recycling of municipal solid wastes as a soil amendment. The principal requirement of compost for it to be safely used in soil is a high degree of stability or maturity, which implies stable organic matter content as well as the absence of phytotoxic compounds and plant or animal pathogens. Objectives: At the present study, the maturity and stability of composted municipal solid wastes at a biocompost plant was evaluated. Materials and Methods: For the assessment of compost maturity, important parameters including temperature, moisture content, pH, electrical conductivity, carbon-to-nitrogen (C/N) ratio, microbial parameters including Salmonella, total and fecal coliforms were measured during the composting process (80 days). In addition, phytotoxicity as seed germination index and heavy metals concentration (Zn, Cu, Cr, Ni, Cd and Pb) was determined at the end of the composting time. Results:The results showed that the C/N ratio decreased during the composting process (reached to 15.6) due to the loss of carbon and the increase in nitrogen content per unit material; also, the NH 4 + /NO 3 ratio decreased with increase in the time of composting and reached

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Section: Heavy Metals Content Of Final Productsupporting

confidence: 61%

Maturity and Stability Evaluation of Composted Municipal Solid Wastes

et al. 2016

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“…It is important to evaluate metals in compost because of the risks to the environment when using organic amendments with a high concentration of metals. Regulations about metals in compost exist in many countries except in México (Barrena et al 2014, Mohee andSoobhany 2014). The microbial quality of vermicompost is important because pathogens can cause damage to the health of those who handle this type of fertilizer.…”

Section: Resultsmentioning

confidence: 99%

Vermicompost as an Alternative of Management for Water Hyacinth

Bernal

Hernández

Osben

et al. 2016

Rev. Int. Contam. Ambie.

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Aquatic weeds, such as Eichhornia crassipes (Mart.) Solms (water hyacinth) can be used as raw material for vermicompost. Vermicompost is the product of microbial decomposition of organic waste through the digestive tracts of earthworms. The aim of this work was to use water hyacinth to obtain stable and mature vermicompost. Three treatments were performed for vermicomposting, treatment one with 100 % of water hyacinth, treatment two with 100 % of cow manure and treatment three with 50 % of water hyacinth and 50 % of cow manure. The earthworm used was Eisenia fetida Savigny. Vermicompost was characterized physically, chemically and microbiologically, and measured by indexes of stability and maturity, as well, metal concentrations were detemined. Germination index was obtained with four different seeds: radish (Raphanus sativus L.), lettuce (Lactuca sativa L.), cucumber (Cucumis spp.) and zucchini (Cucurbita pepo L.). The three different treatments for vermicompost were stable and mature after 110 days with 90 % of E. fetida survival in each treatment. The vermicompost with water hyacinth and water hyacinth plus cow manure had a high pH and electrical conductivity. Radish had the best performance in germination index and the three vermicompost were rich in metals. We conclude that vermicomposting is suitable for managing water hyacinth because it can produce a stable, mature, and rich in nutrients vermicompost, which is useful as organic fertilizer or soil improver. 426descomposición de desechos orgánicos por medio de los microorganismos del tracto digestivo de las lombrices. El objetivo de este trabajo fue utilizar el lirio acuático para obtener un vermicompost estable y maduro. Se realizaron tres tratamientos: uno con el 100 % de lirio acuático, el dos con 100 % de estiércol y el tres con 50 % lirio acuático y 50 % de estiércol, la lombriz utilizada fue Eisenia fetida Savigny. Los vermicompost se caracterizaron física, química y microbiológicamente, además se midieron índices de madurez y estabilidad, así como la concentración de metales. El índice de germinación se realizó con cuatro semillas diferentes: rábano (Raphanus sativus L.), lechuga (Lactuca sativa L.), pepino (Cucumis spp.) y calabacita (Cucurbita pepo L.). Los tres tratamientos resultaron ser estables y maduros después de 110 días de vermicompostaje con un índice de supervivencia de E. Fetida de 90 %, los vermicompost con lirio acuático y lirio acuático más estiércol tuvieron un pH y una conductividad eléctrica altos. El rábano mostró un buen desempeño en el índice de germinación, los tres vermicompost resultaron ricos en metales. Se concluye que el vermicompostaje es adecuado para el manejo del lirio acuático, debido a que se obtiene un vermicompost estable, maduro y rico en nutrientes, que puede utilizarse como fertilizante orgánico o mejorador de suelos.

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“…The production and application of compost potentially contaminate the environment with heavy metals (Mohee and Soobhany 2014).…”

Section: Comparison Of Chemical Characteristics Of Finished Compost Imentioning

confidence: 99%

Comparison between aerated static piles and vermicomposting in producing co-compost from rural organic wastes and cow manure

Abdoli

Omrani

Safa

et al. 2017

Int. J. Environ. Sci. Technol.

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In this study, the process of producing compost from rural separated solid wastes using aerated static piles (ASP) and vermicomposting was investigated which was carried out from September 2015 to January 2016. A combination of waste ingredients, conditions, processing duration, analysis of key parameters (moisture, pH, temperature and C/N ratio) governing the process, the quality of the final product and economic assessment was considered. Six piles were created in the ASP method, and six piles were loaded in vermicomposting pits in which the Eisenia foetida species was used. Three piles in each method (odd piles) contained 100% putrescible wastes, while the rest of three piles (even piles) contained 75% putrescible wastes and 25% cow dung. The total coliform reductions in both kinds of waste compositions were observed. Heavy metals such as lead, cadmium and nickel were not found in any of the piles. Comprehensive statistical analysis, including the comparison of the variables, correlation among variables and analysis of variance, was performed for the measured parameters. Comparing the final product with standards showed that composting proceeded satisfactorily in both methods.

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Comparison of heavy metals content in compost against vermicompost of organic solid waste: Past and present

Cited by 75 publications

References 91 publications

Maturity and Stability Evaluation of Composted Municipal Solid Wastes

Maturity and Stability Evaluation of Composted Municipal Solid Wastes

Vermicompost as an Alternative of Management for Water Hyacinth

Comparison between aerated static piles and vermicomposting in producing co-compost from rural organic wastes and cow manure

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