On page 64 in The Parliament Magazine you will find an article about our Eco-Bis project (sewage sludges becomes high added value biochar (carbon-phosphorus-fertiliser)):
https://www.theparliamentmagazine.eu/articles/magazines/regional-review-september-2014-0
https://www.theparliamentmagazine.eu/articles/magazines/regional-review-september-2014-0