Author/Authors :
Simujide، Huasai نويسنده 1College of Animal Science, Inner Mongolia Agricultural University, Zhaowuda road, 306, 010018 Hohhot, China , , Aorigele، Chen نويسنده 1College of Animal Science, Inner Mongolia Agricultural University, Zhaowuda road, 306, 010018 Hohhot, China , , Wang، Chun-Jie نويسنده College of Veterinary Medicine, Inner Mongolia Agricultural University , , Zhang، Tian-Hua نويسنده 1College of Animal Science, Inner Mongolia Agricultural University, Zhaowuda road, 306, 010018 Hohhot, China , , Manda، Bai نويسنده 1College of Animal Science, Inner Mongolia Agricultural University, Zhaowuda road, 306, 010018 Hohhot, China ,
Abstract :
Background: Composting is one of the most environmentally friendly treatments to inactivate pathogenic organisms
or reduce them to acceptable levels. However, even under thermal conditions, some pathogenic organisms such as E.
coli could exist for a long time in composting. Such great persistence may increase the possibility of outbreaks of these
organisms and further increase the environmental load. Calcium cyanamide (CaCN2) has recently been recognized to
have the fungicidal effect on the pathogens of the soilborne diseases. So, the present study determined the
effect of CaCN2 addition on composting progress as an antimicrobial agent and an amendment during forcedaeration
static-pile composting of cow manure, which was mainly aimed to inhibit the pathogens that had not
been inactivated by heat during composting.
Methods: The mixtures of dairy cow manure and maize straw with addition of 2 % CaCN2 or no addition were
composted for 63 days. The physical, chemical and biological changes in compost mixtures were examined
during composting. The data were statistically analyzed using ANOVA procedure from SAS software (version 9.0).
Results: The results showed that the addition of CaCN2 significantly increased the maximum temperature and
lengthened the duration of the thermophilic phase, and increased the percent T-N but decreased C/N ratio. For
microbiological test, the addition of CaCN2 shortened the time to inactivate E. coli, and increased the total
average population of thermophilic bacteria but did not significantly influence that of mesophilic bacteria.
Conclusion: The results indicated that the addition of CaCN2, at least at the additive content of 2 % could
benefit the thermophilic phase and the composting could quickly reach the sanitary standard during the
composting of manure with maize straw in a forced-aeration static-pile system. This finding will contribute to
solve the feces disposal problems.
