1. Waste to Clean Energy in Robeson County
Paul Grylls – GraniteFuel Engineering
Cody Hunt – Hunt Environmental
Harrell “Gene” Walters – Robeson County Landfill
April 5th, 2017

2. Field Evaluation Robeson County Landfill – Installation February 2016 Dual Vessel Regeneration

3. What is Siloxane? Man-made organic compounds
Frequently used in a range of personal hygiene products, food ingredients and industrial products.
Added to increase ease of spreading, absorption, flexibility in plastics and heat resistance.
Used as a low-cost oil substitution in various food ingredients such as salad dressings and potato chips.
Anti foaming agent used in fast food, cheese and beer production.

4. Impacts of Siloxane on WTE Projects
Loss of Revenue
More Downtime
Loss of Power
Increased Cost
Increased Maintenance
Increased Repair

5. Impacts of Siloxane on WTE Projects
Effects of extensive Siloxane damage to catalyst
White Granular Ash
Plugged Channels
The catalyst was plugged after three days of running time.

6. Design of SRT Media lifespan of over 10 years
No annual downtime or media changeover
Minimal maintenance
Minimal regeneration energy consumption

7. Design of SRT

8. Operation of SRT Design Criteria
System automatically regenerates without shutting down or bypassing.
Regeneration intervals between hours
System can allow future expansion
Regeneration air to be vented through flare.
Greatly improved maintenance schedules
Piston cleaning mostly eliminated & piston replacement at manufacturer recommended intervals
Si level in lube oil no longer decisive factor in lube oil replacement

9. Operation of SRT

10. Operation of SRT

11. Operation of SRT

12. Effects of SRT Robeson County Landfill – Oil Analyses
With the installation of the SRT, the Si levels in the lube oil were no longer the deciding factor in requiring oil replacement.

13. Effects of SRT No downtime caused by SRT Longer maintenance intervals
Spark plugs look relatively clean during former change out period
Engine parts much cleaner during de-coating

14. Summary
Siloxanes cause loss of production and increased maintenance and repair
Regenerative Siloxane Removal Technology is cost effective solution over the long term
Beneficial ROI
Dual vessel system continuously adsorbs siloxanes
Long media life 10+ years between exchanges
Periodic regenerations keep the system active
Silicon levels in oil dramatically reduced
Engine parts observed to be much cleaner during regular maintenance

15. Paul Grylls – GraniteFuel Engineering Cody Hunt – Hunt Environmental
Harrell “Gene” Walters – Robeson County Landfill