Disinfection of solid fraction of cattle manure in drum-type bio-fermenter
Institute for Engineering and Environmental Problems in Agricultural Production (IEEP), Filtrovskoye sh., 3, Tyarlevo, g. RU196625 Sankt-Peterburg, Russia
*Correspondence: rauvarov@gmail.com
Abstract:
In the context of increased intensification of production and disruption of established ties between livestock and crop farms there is an urgent need to introduce novel, more efficient, economically viable and environmentally sound techniques of animal and poultry manure processing. As a part of the ongoing work on implementation of best available techniques (BAT) in various sectors of Russian economy, agriculture included, the bioconversion technology of organic waste in a drum-type bio-fermenter was considered as one of BAT candidates, which is most adapted to the natural and climatic conditions of North-West Russia and feature the minimal environmental impact. The main purpose was to investigate the influence of bioconversion of solid fraction of cattle manure on selected microbial parameters and parasitic purity in the raw material, semi-finished and final products. The study was conducted in the IEEP Organic Waste Bioconversion Laboratory on a patented drum-type bio-fermenter. After 18 hours the digested material self-heated to 55 °C, i.e. the lower limit of the range of thermophilic microbial activity. By the 30th hour after the experiment started the temperature had reached the maximum level of 71 °C, then it dropped to 62–66 °C and stabilized in this range. 48 hours after the temperature reached 55 °C, the content of coliform bacteria reduced to acceptable limits, and that of Enterococcus dropped more than 10 times. After 120 hours the digested product was completely disinfected.
Key words:
biofermentation, cattle manure, disinfection, microbial parameters, parasitic purity