Through the implementation of an effluent concentration system integrated to a methanol recovery system, the steam consumption has been successfully reduced, being this the equivalent to each of the systems mentioned above separately.
That saving, associated with concentrate handling which is sent to glycerin treatment for its recovery, and added to steams condensation, producing hot water of quality (without the need to use a condenser with tower water, and/or multistage systems), makes the system simple and reliable.
The system regulates itself according to the amount of wash water used in the process.
The water that is not re used in the wash stage is utilized in either caustic soda dilution of the pretreatment stage, or in the linter fluidization at the exit of the centrifugal separator of pretreatment.
To sum up, the system contributes to reduce the water footprint and the carbon footprint in a unit with aqueous effluent in general, and in case of the biodiesel units, through integration, it allows to lead to zero effluent.
Environmental impact mitigation per ton of biodiesel (compared to a two-stage system)
- 35-50 Kg of steam
- 0,24 m3 of water treated to replenish in cooling towers
- 3,2 Kwh of electric power
- 6,4 lts. of effluents to dispose
- 9,5 a 12,5 Kg of CO2 (without considering the decrease associated to electric power saving – it depends on its source of generation-)