NÓBREGA, C. C.; http://lattes.cnpq.br/8208309251703934; NÓBREGA, Claudia Coutinho.
Résumé:
The Aerate Static Pile Systems - Forced Aeration
are constituted as one o£ the most efficient processes, o£
low costs, t o the treatment o£ organic residue (urban garbage,
sewer mud, etc.) (SCHULZE, 1981).
The modes of aeration in the composting piles are
done through air injection ( positive mode) and a ir suction
(negative mode), but the positive mode , according to FINSTEIN
et alii (1984) is the one that presents more advantages.
However, much more can be done yet t o develop the process
in relation to the elimination of pathogens and the degradation
increasing of the organic material.
This work had as its objective to study and evaluate
the existent aeration methods and t o propose a hybrid
mode ( alternating the positive and the negative modes, in
cycles ), which objective-would be the in crea sing of the
process efficiency.
During the research, seven composting piles were
assembled: two, in the positive mode; two, in the negative
mode and three in the hy brid mode.
The raw material used i n the experiment was a organic fraction of the urban garbage of Belo Horizonte city - MG.,
triturated, with particles from 20 t o 50 mm, "Zn natafia.".
Table 3.1 presents the composition of the utilized garbage.
The efficiency- evaluation of each aeration mode was
realized thrcugh physical (density, temperature); physicochemical
(moisture content, volatilesolids , carbon and pH);chemical
(nitrogen) ; and bacteriologic faecal Streptococais analysis
besides other diary observations like : aspects, odour, color, attraction of vectores , etc. In the comparison among the aeration modes, was verified that the hybrid mode, developed in this study ,
presents a betterefficiency . In ali the processes, up to
the sixteenth day of the active phase, was registered the
presence of pathogenics micro-organisms and on the last day
of this phase was not more found the presence of these
organisms. In relation to organic material degradation, the
hybrid mode piles , presented, in average, a reduction of
35,431 Cin. twenty daysj, revealing the high efficiency of
this method'in relation to the others , as i n the positive
mode the reduction was of 20,79% (in thirty daysj, and in
the negative mode it was of 6,02$ [In fifty - seven days).
This study executed its objectives , because it
developed a system that elation to moisture reduction, organic material degradation ,
and elimination of pathogens than the other systems used
nowadays.
