Yuzefo – Mikolayivka bioenergy facility in Vinnitsa Region was designed first for 3,2 MWe production, later extended capacity to 5,2 MWe during second stage construction and reached its capacity in two months time, near 60.000 m3 of biogas per day. At stage three of transformation Adverio and partner UTC have added a large industrial gastight Hydrolyser with a volume of 2.500 m3. It has dual purpose – pre-treatment of cellulosic agricultural wastes as well as additional space for primary digestion with an independent feeding system.
At the same time a two-stage biological desulphurization installation was built for high volumes H2S removal (4.000-5.000 ppm entry level). The installation has a few levels of sulphur removal: First under gas membrane on net – stable removal of 1.000-1.500 ppm on 3.000 m3/h biogas flow, second – two stage column biological desulphurization with carriers to lower H2S down to 0-50 ppm level. After desulphurization, a water scrubber is used to wash volatile fatty acids and alcohols from biogas. This water with solubles is further used in the foam fighting system and also used as feedstock. Subsequently, the biogas goes through a cooling/drying process and then is pre-heated before going through polishing coal filters. This process leads to stable power generation and only two oil and coal changes per year.
Recently, the installation was forced to a capacity of 100.000 m3 of biogas per day to replace 30% of natural gas demand at a sugar factory. Considering recent natural gas prices and its shortage, this was a very profitable application for renewable gas. With an organic load of 11 kg per m3 of reactor and 25 days retention time this was not an easy task and takes precise feedstock and nutrients control to keep high conversion rates. Over 60% of the feedstock was chicken manure organic and the rest were beets pulp and wastes of factory, apple pulp, straw and after distillery stillage. After sugar production season is over, the facility will go back to renewable electricity generation at 5,2 MW capacity.
UTC and Adverio are glad to share this success story with you.