Development of fatty waste composting technology using bacterial preparation with lipolytic activity

Abstract

A new composting technology of waste with high fat content was developed in JSC „Biocentras”. The compos-ting technology of fat-contaminated waste is based on the use of fat-oxidizing microorganisms. Developed technology is commended for cleaner production/pollution prevention approach as well as meets strict environmental and hygiene requirements. The composting process was investigated for the process optimization by applying the response surface me-thodology. Values of parameters of composting process were monitored in lab-scale composters. The optimal composition of the composing mixture was determined: the initial fat content – 5%, the concentration of bacterial preparation cells – 109 CFU/g, the quantity of structural materials – 9.5%. Fat degradation rate slowed down 3 times if the initial fatty con-centration increased from 5% to 20%. Concentrated fatty-waste disposal site prototype was designed. Composting process duration lasted 1 to 1.5 year.