Variação da taxa de recirculação de lixiviado determinada pela concentração de ácidos voláteis no tratamento da fração orgânica de resíduos sólidos urbanos domésticos / Influence of volatile acids in the variation of leachate recirculation rate in the treatment of the organic fraction of domestical municipal solid waste

AUTOR(ES)

Marcelo Elias Dillenburg

DATA DE PUBLICAÇÃO

2006

RESUMO

The purpose of this dissertation was to evaluate the possibility of accelerating the process of anaerobic digestion of the organic fraction of domestic municipal solid waste, in two-stage systems, with increasing leachate recirculation rate, through the use of volatile acids as determining parameter of the moment in which the rate must be varied. To do so, two systems of reactors were operated, each being composed by a solids reactor, which contained the solid waste intended to be treated, and an upflow anaerobic filter, which treated the leachate of the first reactor, before recirculation. One of the systems had its recirculation rate increased at constant spells of time, while, in the other system, the moment of the increase in the recirculation rate was a function of the concentration of propionic acid in the system. This study had yet two secondary purposes: evaluating the validity of comparing the results from the two systems of reactors, operated in parallel, in view of the characteristics of solid waste and the adopted procedures for collecting and preparing the substrate, as well as for the loading of reactors; and evaluating the possibility of using anaerobic filters to recover acidified reactors. The following parameters were measured during the process: COD (filtered and non-filtered), pH, alkalinity, solids, Kjeldahl nitrogen, ammonium nitrogen, volatile acids and biogas composition. The development of microorganisms in the reactors was observed qualitatively, using optical microscopy. It was possible to reach the following conclusions: a) the tested procedures allow the comparison of results between the systems; b) the filters are capable of recovering acidified reactors; and c) the employment of the concentration of propionic acid to determine the moment of increase of leachate recirculation rate is capable of accelerating the process, though in a restricted way, for the scale of reactors used.

ASSUNTO(S)

recirculação de lixiviado resíduos sólidos solid waste digestão anaeróbia reprodutibilidade de experimentos sistemas em duas fases reproducibility of experiments anaerobic digestion leachate recirculation two-stage systems

Documentos Relacionados

• Effect of the gradual variation of the leachate recirculation rate in hybrid anaerobic reactors treating the organic fraction of municipal solid wastes
• Influência da recirculação de percolado em sistemas de batelada de uma fase e híbrido na digestão da fração orgânica de resíduos sólidos urbanos
• Comportamento mecânico de resíduos sólidos urbanos
• Effects of sludge addition to seed in hybrid anaerobic solid-liquid bioreactor treating organic fraction of municipal solid wastes
• Compactação e compressibilidade de resíduos sólidos urbanos