Victoria, the capital of British Columbia, has apparently ruled out land application of sludges, deciding to destroy sludge solids through thermal means. As noted here at Chek News, a member of the Victoria city council has argued successfully

that sludge should be barred from being used on land under the region’s sewage treatment plan.

Instead, he said, it should be sold as fuel for cement kilns or burned in a local “waste-to-energy” plant to create heat and electricity. Such a plant is being considered for Victoria’s Upper Harbour as part of the secondary sewage treatment plan.

When I visited Victoria about twenty years ago, they had no sewage treatment at all.  One local told me that the water was too cold for swimming, so they didn’t need it.  He was just kidding, of course.  I don’t know what level of treatment they are going to have, but any level of treatment results in sludge.

It seems the BC city council’s view of many  sludge constituents helped motivate their decision to opt for thermal destruction, which also could include use of cement kilns (incineration by another name, really), in which to burn their sludge.

In the end, though, there are still solids to contend with:  ash.  Volumes of course are far less than the starting sludge, and the ash will not have any sort of microbiological constituents, given the high temperatures involved.


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