| abstract |
A method for the recovery of sewage sludge products, ie sewage sludge, sewage sludge ash or sewage sludge by extraction, in particular phosphate, wherein the suspension of the sewage sludge product is treated with water, alcohol, water- Produced in an alcohol mixture or aqueous solution, gaseous carbon dioxide (CO 2 ) or supercritical carbon dioxide (scCO 2 ) is introduced into the suspension of the sewage sludge product as extractant, and the undissolved solid is separated from the liquid suspension , Carbon dioxide is removed from the suspending agent, and the reusable material dissolved in the suspending agent is precipitated and separated from the suspending agent. |