Determination of maturity indices for city refuse composts

Jiménez, Emeterio Iglesias; García, Víctor Pérez

doi:10.1016/0167-8809(92)90154-4

Cited by 264 publications

(62 citation statements)

References 21 publications

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“…A relação CTC/COT parece ser o índice mais sensível para indicar o estádio de humificação do material (Iglesias-Jimenez & Perez-Garcia, 1992;Sanches-Monedero et al, 1999). No presente estudo, essa variável foi maior que 1,7 e 1,9 mol c kg -1 para todos os resíduos estudados, menos para o esterco de suíno, sendo esses valores os limites para descrever, respectivamente, estercos e lodo de esgoto e composto de lixo bem humificados (Roig et al, 1988;IglesiasJimenez & Perez-Garcia, 1992).…”

Section: Resultsunclassified

Caracterização da matriz orgânica de resíduos de origens diversificadas

Melo¹,

Silva²,

Dias³

2008

Rev. Bras. Ciênc. Solo

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RESUMOVários fatores controlam a velocidade de decomposição e a liberação de nutrientes por resíduos orgânicos. Dentre esses fatores, destacam-se o grau de humificação e a natureza química dos resíduos. Com este trabalho, objetivou-se caracterizar a matriz orgânica de amostras de lodo de esgoto, estercos de galinha, suíno, codorna e bovino, além de composto, substrato orgânico e material húmico comerciais. Analisaram-se o pH, condutividade elétrica (CE), capacidade de troca de cátions (CTC), capacidade de retenção de água (CRA), teores de N total e N-mineral, matéria orgânica, carbono orgânico total (COT) e as frações de COT: C-fração ácido húmico (C-FAH), C-fração ácido fúlvico (C-FAF), C solúvel em água (CSA), C lábil e teor e diversidade de ácidos orgânicos de baixa massa molar (AOBMM). Quanto maior o teor de C-fração ácido húmico, mais elevada é a capacidade de adsorver cátions dos resíduos orgânicos. Considerando-se o índice de humificação (IH), a razão de humificação (RH) e a CTC, e seus respectivos valores críticos (19 %, 28 % e 67 cmol c kg -1 ) para separar materiais decompostos daqueles suscetíveis à decomposição, os estercos de suíno, bovino, galinha e codorna, a amostra de composto e o lodo de esgoto 1 podem ser classificados como resíduos ainda não completamente humificados. O C lábil não foi adequado para predizer a biodisponibilidade dos resíduos avaliados. Os estercos de galinha e de codorna foram os materiais mais ricos em ácidos orgânicos de baixa massa molar.Termos de indexação: substâncias húmicas, carbono solúvel em água, capacidade de troca de cátions, N.(1) Parte da Tese de Mestrado do primeiro autor, apresentada ao Curso

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Section: Resultsunclassified

Caracterização da matriz orgânica de resíduos de origens diversificadas

Melo¹,

Silva²,

Dias³

2008

Rev. Bras. Ciênc. Solo

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“…This difference in duration could be attributed essentially to the nature of the substrate and experimental conditions. Therefore, the C/N ratio alone is not a sufficient criterion to determine the compost maturity as was found in the case of sewage sludge compost which sometimes presented C/N values lower than 15, despite the instability of the product due to the high N-richness of the waste (42).…”

Section: Monitoring Of the Chemical Parameters Of Composting Mixturementioning

confidence: 99%

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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“…However, the issue of how to utilize the compost has never been addressed till now. Several studies (Ko et al, 2008;Gomez-Brandon et al, 2008;Wang et al, 2004;Paion, 1996;Ozores-Hampton, 1994;Maynard, 1993;Havard and Warman, 1993;Jimenez and Garcia, 1992;Mays, 1973) have shown that the compost products are rich in plant nutrients and organic matter which can improve plant growth. Mays (1973) showed a positive yield response to compost application in sorghum, Bermuda grass and corn and improved soil moisture holding capacity but also concerns were raised due to presence of foreign materials that could be ingested by animals over pasture land or in hay.…”

Section: Introductionmentioning

confidence: 99%

Effect of Municipal Solid Waste Compost on the Growth and Production of Vegetable Crops

Ghaly¹

2010

American Journal of Agricultural and Biological Sciences

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Problem statement: MSW has traditionally been dealt with thorough the practice of land filling and incineration. However, deleterious environmental impacts have promoted municipalities in Canada to recycle non-putrescible wastes and compost the putrescible ones. This study aimed at evaluating the effect of MSW compost on the growth and production of three vegetable crops (potatoes, corn and squash). Approach: Each crop received 5 treatments: MSW 1 , MSW 2 , MSW 3 , NPK and 0.5 NPK, 0.5 MSW 1 . MSW 2 and MSW 3 were twice and three times MSW 1 , respectively. MSW 1 was determined for corn and potato based on phosphorous requirements by these crops and the phosphorous content of the MSW compost and was determined for squash based on the nitrogen requirement by the plant and the nitrogen content of the MSW compost. The choice of chemical fertilizer and application rate were based on the optimum NPK ratio for each plant. Samples from the plants were taken at specific growth stages and at harvest for visual health and dry matter analyses. Results: The plant yield for each crop followed the same patterns as those of the visual observations for health ranking and the dry matter. The results showed that 0.5 NPK + 0.5 MSW 1 gave the best plant growth, health and yield for potato and corn while NPK gave the best plant growth, heath and yield for squash. Squash did not seem to respond well to MSW compost. Conclusion: The plots that received MSW 2 were healthier than those reserved MSW 1 and MSW 3 . High rate of MSW may provide higher level of heavy metals than the plant can tolerate while low rate of MSW may not contain all the other required micro-nutrients. Long tern effects of MSW compost on the chemical and microbiological properties of the soil and the plant properties such as taste, appearance, storability, susceptibility to bugs and disease should be evaluated.

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Determination of maturity indices for city refuse composts

Cited by 264 publications

References 21 publications

Caracterização da matriz orgânica de resíduos de origens diversificadas

Caracterização da matriz orgânica de resíduos de origens diversificadas

Maturity and Stability Evaluation of Composted Municipal Solid Wastes

Effect of Municipal Solid Waste Compost on the Growth and Production of Vegetable Crops

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