Dry Mill Project Overview

Projects will use basic technology Package: Millenna/OLGA/Vesta

  • Millenna: Gasifier to Syngas
  • OLGA: Syngas clean-up
  • Vesta: Syngas through multi-stage methanation to CH4

critical size

Millenna runs efficiently with 60 tons per day feedstock input.

conversion efficiency

Total efficiency from Corn Stover biomass BTU input to CH4 output is 70%.


High output will minimize basic OpEx: Feedstock Cost/MMBTU output.

Technical Potential

Technical Potential

The Technical Potential estimates a reasonable/optimum production of CH4 from Corn Stover.
Here are the basic steps:

  • Determine the annual Corn Stover production.
  • Assume 50% is harvested and delivered. 60 Short Tons/Day
  • Calculate for 1 year delivery
  • Calculate Total Annual Deliveries.
  • Calculate maximum CH4 yield.
Annual Production

Annual Production

  • Annual yield is 337.5 Million Metric Tons.
  • Of that, assume 50% can be harvested and delivered.
  • Total available is 168.75 Million Metric Tons = 186.6 Million Short Tons.
Annual CH4

Annual CH4

  • Annual Short Tons Produced = 186.63 Million Short Tons
  • Annual Feedstock Delivery = Delivery @ 60 Tons Per Day = 18,615
  • Annual Production = 229,500 MMBTU per Annual Delivery.
  • Total MMBTU = 2,300,917,809/year.
% of Residential Use

% of Residential Use

  • Residential Natural Gas Use: 5,000,008 Million Cubic Ft.
  • Tech Potential Production: 2,300,918 Million Cubic Ft.
  • Tech Potential as % of Residential = 46%.
Project Benefits


Projects will be co-located at existing dry mill ethanol plants.

  • The dry mill plants use corn as feedstock and natural gas as fuel to produce ethanol. Stover is an underutilized by-product.

  • As a general rule stover is not fully utilized and usually as a feed supplement. A fraction is left on fields and used as cover.

  • SYNCH4 offers minimum storage requirements, a fair price for delivered feedstock, and zero CO2 per MMBTU.