Evaluating Yard Trimmings As A
Bulking Agent During The Composting Of
Organic Slaughterhouse Wastes
Author(s)
R. S. León, A. A. Rodríguez & H. Santiago
Abstract
The objective of this experiment was to evaluate freshly cut (FCYT) and semidecomposed
(SDYT) yard trimmings as bulking agents (BA) on the composting
process of organic wastes from a commercial slaughter house (SHW).
Treatments consisted in all combinations of BA (FCYT and SCYT), layers of
SHW (none, single or double), and seven composting phases. Mixtures were
weighted in a 2:1 proportion (BA:SHW) and placed in composting bins of
identical dimensions (3 ft3). The moisture level was adjusted to 60% at the start
of each composting phase. Temperature was recorded daily to determine the
time (d) needed to reach the first and second heat cycles. Composting
characteristics such as pH, C:N ratio, OM, IM, and N concentration were
measured at 0 d, at the peak of the first and second heat cycles, and 0, 20, 40 and
60 d of maturation in the composting process. Data were analyzed using a 3
(layers of SHW) x 2 (BA) x 7 (composting phases) factorial design and ANOVA
procedure of SAS. All treatments of FCYT/SHW and SDYT/SHW exhibited
thermophillic temperatures after three days of composting. Regardless of
treatment combination pH ranged from 7 to 8. Contents of OM and C were
higher (P<.05), but IM was lower (P<.05) in FCYT than SDYT at all composting
phases. At 60 d of maturation N and C:N values were not different. There was a
decrease in OM and an increase in IM in all combinations of BA: SHW at all
sampling times. At the end of the maturation phase, the C:N ratio was similar
for none and single layers of SHW, but lower (P<.05) in double layers of SHW.
In summary, FCYT and SDYT resulted in excellent BA for the composting of
SHW. Further studies are needed to evaluate the use of this compost as an
organic fertilizer.
Keywords: composting, slaughterhouse wastes, bulking agents, yard trimmings.
Keywords
composting, slaughterhouse wastes, bulking agents, yard trimmings.
Related Book
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