Resources on Compost

May 23, 2008 at 10:12 pm 1 comment

A section to consolidate or list available resources on composting.  

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Entry filed under: Compost. Tags: , .

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  • 1. Sunday Harrison  |  June 1, 2008 at 3:23 pm

    Some facts & ideas about the current green bin system

    Processing Organics in Toronto
    Conversation with Geoff Rathbone, General Manager
    Solid Waste, City of Toronto
    February 2008

    We currently truck out about 1 million tonnes of garbage out of the City. Of this, 110,000 tonnes of organics are shipped to various facilities (3 in Quebec, 2 in Ontario) which process the waste into “digestate”. From there, a portion (Qty?) is reshipped back to Toronto where it is aerobically composted along with the City’s leaf & yard waste in windrows, another 100,000 tonnes, also by private contractors. The digestate and/or the final product belongs to the contractors, with the City receiving just enough to give away a mix of leaf compost and greenbin compost on Environment Days. The final product is certified Class A, Unrestricted Use, which means it should be safe for food growing. However, MOE testing does not include hydrocarbons and salt, which are high in the finished product due more to the leaf compost (obtained from city streets) than to the anerobic digestate. Thus, Solomon Boye, the City’s own community gardens co-ordinator, does not recommend it for food production.

    The City’s plan is to a) substitute the Quebec processing for processing closer to Toronto, and b) to bring multi-unit residences on line for collection. When the Disco and Dufferin processing plants are completed, between 2010 and 2012, we will be diverting 170,000 tonnes of organics, and about 65% will be handled between the two local plants, with the remainder going to London (20%), Courtice (5%) and Newmarket (10%).

    The City is handling residential and small business waste, while private haulers are still handling supermarket & brewery wastes, so our own plan would be affected only by the increased Green Bin pickup from highrises. Plus, we could potentially use the digestate as an input also.

    Reply

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