Technical and technological solutions to increase the biogas production efficiency in the agro-industrial waste waters treatment

A modified biogas technology was elaborated for the treatment of agricultural wastewaters, using the phyto-catalysts for managing the biochemical processes (Covalov, V., Malina, J.F. et al. 2014). To implement the proposed technology, an integrated bioreactor design has been developed. To manufacture a pilot reactor, the available equipment at the “Bardar” Winery (Republic of Moldova) has been used and modernized. As a feedstock for the biochemical digestion a post-distillery vinasse in a mixture with cattle manure was used, to ensure rapid initiation and development of methanogenic process, due to the high contents in methanogenic microorganisms in manure. The ecological effect was due to the preventing of discharges of 15,7 m3 biomass/day, or total amount of 24000 m3 of untreated hazardous concentrated wastes into the natural water bodies (during the bioreactor operation period). Initial concentration of organics in feedstock was 27400 mg O2/l (COD), and after the anaerobic and following microfiltration treatment was approx. 187 mg O2/l.