Queima de lodo biológico em caldeira de biomassa de uma fábrica de celulose: case FIBRIA

Abstract

The search for environmental improvement is causing some companies to adapt and change their production processes to eliminate or reuse discarded waste. The use of such waste is no longer a problem and a profitable solution is to dispose of waste and reuse it as raw material or aid in the industrial system. You can minimize the generation of waste by modifying the industrial process, adopting clean technologies, replacing raw materials or inputs. The paper industry is the third largest consumer of water and liquid generator. During its treatment large volume of sludge is generated. In the traditional method of disposal is the sludge into industrial landfills. In the industrial process of FIBRIA and the Três Lagoas – MS plant, they are not to depositing the sludge in landfills but it is incinerated with biomass to generate energy. The main aim of this paper is to compare the energetic, environmental, financial and operational gains of organic sludge burning in biomass boilers with the traditional methods of disposal of sludge in landfills. Results indicate from and energy balance point of view burning the sludge is not attractive, since the sludge has a high continent of water, requiring additional expenditure of energy from biomass for its evaporation. However, from the environmental, financial and operational point of view, the sludge burning system is more advantageous due to the minimization of environmental liabilities, air emissions, lower operating costs and longer lifetime of energy system.