The biogas plant will be located in the area of Raízen’s second largest ethanol and sugar mill that processes more than 5 million tons of sugar cane per year, producing high volumes of vinasse, the main by-product generated from the production of ethanol.
Bonfim vinasse biogas plant will receive 9.200 cubic meters of vinasse every day. The bioreactors will have a capacity to treat 500 tons of COD (chemical oxygen demand) per day, with a production of 187.000 Nm3 biogas in the 24h range. The biogas will be used to produce 17.5 MW of electric energy which will be sold to the national grid. The digested vinasse will be used as fertilizer in the sugarcane plantation.
The solution implemented by Sebigas is suitable to treat organic industrial effluents with high rate COD and low pH, such us vinasse, POME, tapioca pulp and waste water, explained Lorenzo Pianigiani, executive of Sebigas do Brasil. “The solution offers stable and strong treatment of the by-product and efficient biogas generation. The system is also designed to handle variations in substrate flow and composition, in order to maintain and guarantee the daily biogas production and plant performances.”