Ash Handling and Utilization
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Basics
- This page goes over the proper protocol for Ash handling, as well as various methods in which it can be used
- Need to determine composition of Biomass ash (and if it's fractions' differences are as significant as Coal Ash
Utilization
Fly Ash
Ash in General
- Agricultural Use (Assuming it is entirely extracted from the Charcoal in the Charcoal Washing process (as well as emissions capture) it should be nearly all of the non-(hydro)carbon elements/compounds from the plants/soil. THUS by returning it to the soil in the proper amounts you close this loop
As a Binding Agent in Cement-bonded wood fiber
Chemical Processing
- In cases of Phytoremediation or Burning/Co-Firing with RDF or even unsorted MSW, the ash can contain significant amounts of metals
- Magnetic Separation and Acid Leaching can be used for recovery
- Acid Fly Ash Washing or FAW is a commercialized process largely for recovery of Mercury
- It uses a Wet Scrubber based Flue Gas Desulfurization process to produce the acid for the process as well which is an interesting synergy
- This may have the added benefit of turning Hazmat into worst case scenario more “normal” waste, or better yet Ash of sufficient quality to be used as a Chemical Feedstock or interchangeably with Biomass Sourced Ash in BOAR
Internal Links
- Ash
- Ash Content
- Biomass Origin Ash Return (Abbreviated BOAR)
- Charcoal Washing
- Gas Scrubber
External Links
- "Options for increased use of ash from biomass combustion and co-firing"
- A 2020 Paper Titled "Valorisation of agricultural biomass-ash with CO2"
- A 2012 Paper Titled "Ash Management Review—Applications of Biomass Bottom Ash"
- A Video by the YouTube Channel " Living Web Farms " Titled "Waste Not Wood Ash with Dan Hettinger "
- At (insert timecode here) they discussed lab testing of ash for composition + agricultural use dosing, should look into this
- A Video by the YouTube Channel " Living Web Farms " Titled "Waste Not Wood Ash Part 2"