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

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

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.

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

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.

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

Design of SRT

Operation of SRT Design Criteria System automatically regenerates without shutting down or bypassing. Regeneration intervals between 24-72 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

Operation of SRT

Operation of SRT

Operation of SRT

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.

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

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

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