Estudo dos lixiviados das frações do aterro sanitário de São Carlos - SP por meio da caracterização físico-química / Study from de leachate of fractions from São Carlos landfill - SP through the physicochemical characterization

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

This work aimed to determine the stages of the decomposition of the waste disposed in São Carlos - SP landfill fractions through the study of the characteristics of the generated leachate. Samples were collected from the older area of the landfill (closed 10 years ago), and also from the first, second and third new built areas (garbage is still being dumped in the third one). The samples were collected in two periods: the dry one (from June to September 2009) and the rainy one (from October to December 2009). The concentration of pH, alkalinity, total volatile acids, COD, solids, metals, sodium and potassium, total nitrogen and ammonium-Nwere determined in the study. In all the points sampled the values of pH were higher than 8. The alkalinity ranged from 4000 mg/L to 12000 mg/L CACO IND.3, while the total volatile acids concentrations were less than 700 mg/L CACO IND.3. The COD present concentrations between 3000 e 7000 mg/L in the dry period decaying to 2000 and 4000 mg/L in the rainy period. The results found suggest that all the leachate analyzed is in the methanogenic phase of the organic matter. From the total nitrogen and ammonium Nresults it turned out to be evident that ammonia is the major pollutant present in the leachate - more than 70% of the total nitrogen. The biodegradability was investigated through the relations VFA/COD and VS/TS and resulted in values lower than 0,25 and 0,3 respectively, indicating that the leachate from São Carlos landfill has low biodegradability.

ASSUNTO(S)

physicochemical characterization resíduos sólidos caracterização físico-química landfill leachates lixiviados de aterros sanitários solids wastes

ACESSO AO ARTIGO

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