Biosolids debate continues as experts weigh in
Posted Nov 2, 2011 06:02:11 AM.
This article is more than 5 years old.
A panel of experts and activists met in Halifax to discuss the safety and effectiveness of biosolids use, but there is still no consensus on the product’s effects.
Tuesday’s discussion was organized by the Union of Nova Scotia Municipalities and occurred a week after Halifax Regional Council voted 17-5 in favour of lifting a ban on the use of the fertilizer, made from treated human waste.
A consultant’s report, delivered to council prior to that vote, stated the biosolids are safe for use on city property, but recommended continued scrutiny and public education.
The members of Tuesday’s panel discussion, however, varied in their opinion on the product’s safety and effectiveness.
“We are challenging the claim that acceptable levels of pollutants that are being detected in sludge are having no negative impact on health or the environment in rural communities,” said Biosolids Free Nova Scotia chair, Marilyn Cameron.
Maureen Reilly, of Sludge Watch Ontario, adds that many Canadian jurisdictions have banned biosolids use.
But others disagreed, pointing out that just as many jurisdictions use the fertilizer with no adverse effects.
“There are no known risks associated with land application of Class A biosolids when they are treated and used according to our guidelines,” said Alan Benninger, Interim Biosolids Coordinator, with Nova Scotia Environment.
Marc Hebert, a senior biosolids scientist with the Quebec government, said biosolids are actually safer than regular manure because of the regulations in place.
He cited a Ryerson University study showing worms exposed to biosolids suffered no toxicity.
Last year, the city spread a biosolids mix along Dunbrack Street in Halifax.
Soon after, nearby residents reported a foul smell in the area and some became sick, prompting council to impose a moratorium on any further use.
The city had also been using biosolids in Point Pleasant Park, but received no complaints about odours there.
