Methane Digester

Clearydale has two methane digesters, the currently operation digester which was built in 2012, and an older, unused digester which was constructed in 2006.

New Methane Digester Project (2012)

Construction of the new methane digester started in 2012, spearheaded by Dairy Lane Systems. The design is based off of proven technology in Germany and was commissioned by German engineers.

Installation includes:

  • 3000m³ (28m DIA) Active Volume Digester Tank
  • SC2100 Technical Container
  • 3 Mixing Nozzles
  • Dual Layer Roof System
  • T15 Solids Feeder
  • 6 m³ High Temp Pasteurizer
  • 100 m³ Liquid Waste Receiving Pit
  • Twin 250kWel Halg CHP units
  • C-Deg Waste Gas Burner

Figure 1: Basic process of renewable resources made possible by anaerobic methane digester.
Digester Process

How it works:

  • Cow manure coming out of the barn goes into the anaerobic digester
  • Methane produced by bacteria in the manure (and added fats/oils/grease) rises to the top
  • The methane is directed into a heat and power system, where it is burned in two 250kw engines that make electricity
  • The electricity is measured by a meter and the farm consumes what it needs
  • Excess power is sent out to the grid, again measured (the difference is deducted from the Hydro One bill)
  • Clearydale Farms is paid ~$0.164/kw

Photos

The new methane digester built by Dairy Lane Systems
Augers to input material directly into the digester (Fats/Oils/Grease, corn silage, waste feed, bedding)
Engine room, built by Central Precast
Inside of engine room. Contains controls, heat exchangers and two 250kw Mann engines.

Original Digester Project (2006)

This project began in 2006, in conjunction with Powerbase. The project was to involve demonstrating a modular, factory-built, containerized combined heat and power system and anaerobic digester. This modular energy system would potentially reduce the capital, installation and commissioning costs of anaerobic digester systems.

Powerbase became overextended by having too many projects on the go and went bankrupt, leaving half a dozen digesters idle and partially complete. Problems with the control systems had caused delays in construction. The three 175kw engines at this farm were converted back into standalone diesel generators and one was sold to the Spencerville Agricultural Society to generate power during the annual fall fair.

The watertight, insulated Harvestore tank holds approximately 1.5 million litres, or 1,500 tonnes with a measure of approximately 60' by 40'. One agitator pump remains installed, with nozzles in the top and bottom portions of the tank to stir the contents.