“…Additionally, their solubility in water (as well as in other green solvents, such as ethanol) is a bonus. The most widely reported organic acids used in leaching treatment of WC hard and soft scraps are acetic acid [57,95], succinic acid [114], lactic acid [114], itaconic acid [114], lactobionic and maltobionic acids, formic acid [113,114], malic acid [113,115], citric acid [104,112,114], tartaric acid [113], and maleic acid [114,116].…”