The technology of water separation and purification after anaerobic digestion of liquid manure, and biofertilizer production from organic sludge

Abstract

In the wake of the man's household activity, large quantities of organic waste are created and their accumulation leads to serious ecological and social problems. Even though in most cases organic waste can be reused in the household and energetics sectors, due to the variety of different chemical components, the complex technology of the waste management and recycling is yet not available in the market. One of the most universal ways to utilize the household and agricultural waste is anaerobic fermentation, which not only degrades waste, but provides the benefit of the energy from emitted bio-gas. However, this method does not completely solve the task of total waste reprocessing into an economically profitable product. Also, after the emission of bio-gas, liquid organic waste still occupies a large volume, has a foul smell and might have toxic substances and pathogenic microorganisms. In this study, the organic household and agricultural waste management technologies, used in the last decades, are discussed and summarized, the sequence of water separation and purification processes and the ways to degrade organic compounds and liquidate undesirable scents are suggested. The results of completed research are presented. During technological processes, water was separated from liquid manure and purified. After the treatment of slurry of concentrated organic components, the dry, sterile and odourless complex of organic and mineral compounds, that can be used for soil fertilization, has been obtained.