[Sanitary bacteriological evaluation of organic waste in livestock enterprises]

Bacteriological studies of group samples of fresh and discomposed fowl manure, cattle and pig manures were performed. The sanitary microbiological state of organic waste was evaluated by the total microbial count (TMC), the number of coliform bacillus enteropathogenic serotypes (CBES), salmonella and staphylococci. As a result of studying samples of fresh fowl manure (manure of caged laying hens and floor-managed broilers) different CBES were distinguished, respectively, as well as salmonella of the group Salmonella Dublin, with TMC (6.4-13.1) *10E7 CFU/g and (4.1-11.3) *10E7 CFU/g, respectively. An analysis of fresh cattle manure showed high degree of microbial contamination. Thereto the level of bacterial contamination of fresh no-bedding manure was 1.5-2 times higher than the bedding one. The similar trend was observed in respect of bacteria of the group of coliform bacillus and staphylococci. CBES were detected: O25; O137; O119; O08; O145 and S. dublin. An investigation of fresh pig bedding and no-bedding manure has found that the latter under the floatable removal system had the level of microbial contamination high as twice, and the coli-titer and the titer of staphylococci lower than the no-bedding manure under water wash system, with TMC – 2.3 *10E7-4.8 *10E9 CFU/g. In the samples of fresh pig manure CBES and S. dublin were isolated. The discomposed fowl manure, cattle and pig manures resulted from sludge composting for 7-9 months had TMC – (2.1-14.3) *10E6 CFU/g, coli-titer – 0.01-10, titer of staphylococci - 0.1-10, in the absence of CBES allowing to use this organic waste as organic fertilizer. It is concluded that fresh fowl manure and cattle and pig manures having high level of bacterial contamination constitute epizootic and epidemiological danger, at the same time, its storage and processing on the basis of composting promotes the death of pathogenic asporogenic microflora making the organic waste sanitary-safe.