Environment

Compost Operations

 

Wastewater treatment byproducts, or biosolids, are used as a key ingredient in the GMWC composting system.

Treatment of sludge at the WWTF involves conditioning with liquid lime, use of high-speed centrifuges for dewatering, followed by the addition of dry lime.

Upon arrival at the Composting Facility, it is mixed with green waste consisting of bark (from sawmills), ground forestry waste, wood chips and other green waste.

The initial mix produced 40 windrows that are 50 m long on the composting pad. Windrows spend a minimum of eight weeks on the active aerated pad and are turned over three times. The windrows are covered with a breathable cover during the initial phases and can reach temperatures of more than 70° Celsius. The windrows are then moved and grouped into lots of three initial windrows on the curing pad where they are conditioned and left to compost at a slower rate while cooling down. The complete process takes one year. Consequently, 2016’s production will be available for use in 2017.

Processing and product usage in 2017 involved screening of the 2016 stockpiles (lots) for use by the general public, landscapers and local municipalities. The public was allowed to pick up compost free of charge from the self-loading bins. Product was sold to landscapers and is provided to the area municipalities for their horticultural activities. Significant amounts of compost were also used by the City of Dieppe on sections of the walking trail and adjoining properties.

Historical Data :


 

2012

2013

2014

2015

2016

Biosolids Wet-Tonnes

9,106

10,358

10,855

11,449

11,311

Biosolids Dry-Tonnes

2,591

3,072

3,089

3,229

3,169

% Solids

28.5

29.7

28.4

28.2

28.0

 

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