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Digestate Dryer
Digestate Slurry Range 3-10% DS, Fuel Options: Combined Heat and Power (CHP), Renewable Natural Gas (RNG), Natural Gas (NG), Propane, Uses: Fertilizer, Bedding, Animal Feed, Class A Pellets produced. Biogas operators face increasing challenges in respect to the liquid manure ordinance, storage issues, the nutritional balance of fertilizer, and the application of liquid digestate. Pelletizing digestate is an excellent way to combat these challenges, producing a Class A product in accordance with the EPA guidelines.
- Turn heavy liquid digestate into a dry product to lower transport costs
- Energy from a CHP can be used instead of expelled
- Keep all beneficial nutrients intact while eradicating harmful bacteria
- Store more digestate by reducing its volume
- Either use the resulting pellet for fertilizer and/or market it for a profit
An exhaust gas drying procedure is not only a very interesting economical solution to waste management problems, but considerably improves the overall situation of the plant and serves as active environmental protection.
Liquid digestate is mixed to a moisture content of 30% DS by a dry material return line and screw conveyor and then transported into the dryer. In less than 6 minutes 90% DS pellets are produced. Your digestate product is completely sterilized, meeting the EPA’s Class A biosolids requirements.
The entire process is fully automated and is adjusted to varying outputs by means of an intelligent control system. No matter what your power source(s) are, the drying process is regulated automatically. An ARC (active remote control) monitors the procedure in real time and saves all drive, temperature and control-relevant data in an interval of 5 seconds.
If you have a CHP, much of the thermal energy from its exhaust gas flow can be directed into the dryer instead of being discharged into the atmosphere. The liquid is completely evaporated, but all nutrients remain in the dried digestate in a concentrated form. You then have a valuable fertilizer for your own purposes and/or for marketing purposes.