title: Effect of passivator on Cu form transformation in pig manure aerobic composting and application in soil.
abstract: A sequential extraction approach was used to evaluate the effects of various combinations of passivators (sepiolite, phosphate rock, and coal fly ash) on the concentration and speciation of Cu in swine manure aerobic compost along with soil to which the compost had been applied. The results indicate that the various passivators altered the bound forms of Cu in pig manure and soil; the concentrations of exchangeable and Fe-Mn-bound Cu decreased, whereas the residual Cu concentration increased, indicating that Cu transformed to low-availability forms after the passivator treatments. The concentrations of the carbonate-bound and organic-bound Cu varied widely. Among all treatments, the treatment of the control + straw + sepiolite + coal fly ash (2.5 %) + phosphate rock (5.0 %) resulted in the most efficient passivation of Cu; the percentage of residual Cu reached 3.91-21.14 %, obviously surpassing the percentage for the control without passivation. The treatment of the control + straw + sepiolite + phosphate rock (2.5 %) resulted in the lowest residual Cu fraction (0.85 %) among passivator treatments. These results show that the addition of suitable combinations of passivators to the composting process reduced the availability of Cu and the risk of Cu pollution during the application of composted pig manure to soil. Passivation also decreased the Cu content of Apium graveolens.
authors.affiliation: Institute for Eco-Environmental Sciences, Wenzhou Vocational College of Science and Technology, 325006, Wenzhou, China. 13736961468@163.com.
authors.forename: Xiao-Ming
authors.initials: XM
authors.lastname: Lu
authors.affiliation: Faculty of Civil Engineering and Architecture, Zhejiang University of Technology, 310014, Hangzhou, China.
authors.forename: Peng-Zhen
authors.initials: PZ
authors.lastname: Lu
authors.affiliation: College of Hydraulic and Environment Engineering, China Three Gorges University, 443002, YiChang, China.
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Chen
authors.affiliation: Institute for Eco-Environmental Sciences, Wenzhou Vocational College of Science and Technology, 325006, Wenzhou, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.affiliation: School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA. jie.fu@ce.gatech.edu.
authors.forename: Jie
authors.initials: J
authors.lastname: Fu
mesh_terms: D000332:Aerobiosis; D000818:Animals; D000077102:Apium / Q000254:growth & development; D060729:Coal Ash / Q000737:chemistry; D003300:Copper / Q000737:chemistry*; D017633:Magnesium Silicates / Q000737:chemistry; D008372:Manure; D010710:Phosphates / Q000737:chemistry*; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*; D013552:Swine
chemical_list: D060729:Coal Ash; D017633:Magnesium Silicates; D008372:Manure; D010710:Phosphates; D012987:Soil; D012989:Soil Pollutants; D003300:Copper; C001671:magnesium trisilicate
keywords: Aerobic composting; Appending proportion; Cu; Passivator