A process for the production of biochar from waste sewage sludge is proposed. Sewage sludge carbonization was done at 300-500 ◦C and retention times of 1-2 hours. Biochar yields of up to 58% were achieved and the biochar had a surface area of 240 mg/g. Initial cost evaluations indicated that for the plant producing 2.8 tons of activated biochar, a rate of return of 41.2% and payback period of 4.3 years.
Sewage Sludge Valorisation to Biochar Through Carbonization as a Way of Promoting a Circular Economy in Municipal Sewage Plants
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