| Change of Cu and Zn chemical speciation and fractions during the swine manure co-composting with flyash under aerobic conditions |
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| DOI：10.7606/j.issn.1000-7601.2012.06.32 |
| Key Words: flyash swine manure aerobic compost Cu Zn chemical speciation |
| Author Name | Affiliation | | LI Ronghua | College of Resources and Environmens, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Meng | College of Resources and Environmens, Northwest A&F University, Yangling, Shaanxi 712100, China | | QIN Rui | College of Resources and Environmens, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Guangjie | College of Resources and Environmens, Northwest A&F University, Yangling, Shaanxi 712100, China | | XIAO Ran | College of Resources and Environmens, Northwest A&F University, Yangling, Shaanxi 712100, China | | LI Xiaolong | College of Resources and Environmens, Northwest A&F University, Yangling, Shaanxi 712100, China | | ZHANG Zengqiang | College of Resources and Environmens, Northwest A&F University, Yangling, Shaanxi 712100, China |
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| 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 percent-ages of DTPA extractable Zn and Cu in compost piles decreased and showed more significant in treatment with 5% fly-ash. The Sposito’s chemical speciation
analysis showed that the fractionation was in the order of Cu-NaOH>Cu-HNO3>Cu-EDTA>Cu-Residue>Cu-KNO3>Cu-H2O and Zn-HNO3>Zn-EDTA>Zn-NaOH>Zn-Residue>Zn-KNO3>Zn-H2O for Cu and Zn respectively. The Cu-KNO3, Cu-H20, 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. |
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