Tratamento e reuso do efluente de biodigestores no processo de biodigestão anaeróbia da cama de frango / Treatment and reuse of efluent of digesters in the anaerobic digestion of poultry litter

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

29/07/2011

RESUMO

The anaerobic digestion process contributes as a method of treating poultry litter and energy generation. However, its applicability may cause some counter-intuitive, requiring for dilution to provide a suitable environment for microorganisms active in the anaerobic process. This dilution increases volume and difficulty of disposal of effluent. Thus, the objective of this study is contribute to the sustainability of the process of anaerobic digestion of poultry litter, assessing the feasibility and the influence of effluent treatment and use of biogas digesters in place of water in the preparation of new substrates for the same process .The research was conducted at the Laboratory of Sanitation, Faculty of Agricultural Engineering, UNICAMP, in two separate steps_ step A had the physicochemical and microbiological analysis of each stage of treatment, supply (AB) and effluent of the digesters (EB), physical separation with sieves and sedimentation (D) and treatment in constructed wetlands with Pistia stratiotes (CL). There was reduction of 5.56% (AB x EB), 32.66% (AB x D) and 74.94% (AB x CL) of TS and increase of 132.00% of NH3 (AB x EB), 168.00% (AB x D) and 9.50% (AB x CL). Reductions were observed for total coliform and E. coli in all stages of treatment but not elimination. Step B were prepared three different treatments T1 composed of chicken litter, clean water and inoculum. T2 consists of chicken litter and treated effluent from the step A and T3 consists of chicken litter and untreated effluent step A. Assessments were made of each physico-chemical treatment step beyond monitoring the production of biogas. The biogas production was differed among treatments, while cumulative production during the 50 days of digestion for the T1 was 0.073 m3, 0.175 m3 of T2 and T3 of 0.101 m3. The potential production of biogas per kg of chicken manure were 0.067 m3 (T1) 0.168 m3 (T2) and 0.097 m3 (T3)

ASSUNTO(S)

industria avicola leitos cultivados esterco saneamento zootecnia poultry industry wetlands manure sanitation animal science

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