title: Counter-current acid leaching process for copper azole treated wood waste.
abstract: This study explores the performance of a counter-current leaching process (CCLP) for copper extraction from copper azole treated wood waste for recycling of wood and copper. The leaching process uses three acid leaching steps with 0.1 M H2SO4 at 75degrees C and 15% slurry density followed by three rinses with water. Copper is recovered from the leachate using electrodeposition at 5 amperes (A) for 75 min. Ten counter-current remediation cycles were completed achieving > or = 94% copper extraction from the wood during the 10 cycles; 80-90% of the copper was recovered from the extract solution by electrodeposition. The counter-current leaching process reduced acid consumption by 86% and effluent discharge volume was 12 times lower compared with the same process without use of counter-current leaching. However, the reuse of leachates from one leaching step to another released dissolved organic carbon and caused its build-up in the early cycles.
authors.affiliation: University of Toronto, Faculty of Forestry, ON, Canada.
authors.forename: Amélie
authors.initials: A
authors.lastname: Janin
authors.forename: Pauline
authors.initials: P
authors.lastname: Riche
authors.forename: Jean-François
authors.initials: JF
authors.lastname: Blais
authors.forename: Guy
authors.initials: G
authors.lastname: Mercier
authors.forename: Paul
authors.initials: P
authors.lastname: Cooper
authors.forename: Paul
authors.initials: P
authors.lastname: Morris
mesh_terms: D003300:Copper / Q000302:isolation & purification*; D004595:Electroplating; D059027:Recycling; D014867:Water; D014934:Wood / Q000737:chemistry*
chemical_list: D014867:Water; D003300:Copper