Benefits of Aerated Windrow Composting in Colder Climates

We had the privilege of working with the City of Whitehorse on their food waste and yard waste composting program. When they began the process five years ago, they initiated a turned windrow composting program. The challenges that they encountered included:

Turned windrow composting of source separated organics has some disadvantages.

Turned windrow composting of source separated organics has some disadvantages.

1. plastic and other non-organic material wrapping around the turner rotor

2. small windrows not retaining heat during colder months

3. inefficient use of space

4. excess cost of moving material from receiving area, to turned windrow area, back to screening area

In the fall of 2012, we suggested that the City of Whitehorse utilize a vertical auger mixer to open bags, blend and size reduce the incoming curbside collected yard waste and food waste. We suggested implementing aerated windrows instead of turned windrows.

The aerated windrows were implemented in spring 2013, utilizing existing piping available, and aeration blowers and timers.

Aerated windrows at the City of Whitehorse composting facility.

Aerated windrows at the City of Whitehorse composting facility.

We also recently provided a Supreme EnviroProcessor, which increases the efficiency of material preparation for composting.

Supreme Enviroprocessor preparing food waste and yard waste blends at - 25C.

Supreme Enviroprocessor preparing food waste and yard waste blends at – 25C.

Overall, the changes to the composting program allows the City of Whitehorse to expand their program without requiring additional space, and reduces the operations cost due to a more efficient site layout.

 

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