Title: Change of Cu and Zn chemical speciation and fractions during the swine manure co-composting with flyash under aerobic conditions
Abstract: In order to evaluate the effect of flyash on chemical speciation,total content,DTPA extractable content of Cu and Zn,and potherb mustard seed germination during aerobic composting,a composting study was conducted in a pilot reactor.Swine manure was mixed with corn stalk powder as a bulking agent,and the mixtures were amended with flyash at 0%,2.5%,5.0%,7.5% and 10%(w/w) and composted for 90 days in the experiment.The results showed that total Cu and Zn concentration in compost piles increased during the composting process,while the percentages of DTPA extractable Zn and Cu in compost piles decreased and showed more significant in treatment with 5% flyash.The Sposito's chemical speciation analysis showed that the fractionation was in the order of Cu-NaOHCu-HNO3Cu-EDTACu-ResidueCu-KNO3Cu-H2O and Zn-HNO3Zn-EDTAZn-NaOHZn-ResidueZn-KNO3Zn-H2O for Cu and Zn respectively.The Cu-KNO3,Cu-H2O,Zn-KNO3 and Zn-H2O content decreased with the composting time prolong,while there was no significant difference among the treatments.The potherb mustard seed germination was strongly influced by the flyash adding,especially when the addition amount exceeded 5%.The results implicated that the DTPA extractable Zn and Cu could be greatly decreased by adding flyash during the swine manure composting and the suitable addition would be 5% of flyash,according to the potherb mustard seed germination test results.
Publication Year: 2012
Publication Date: 2012-01-01
Language: en
Type: article
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