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| Impact of different passivating agents on heavy metals Cu, Zn and Mn in pig manure |
| Received:October 21, 2017 |
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| KeyWord:sodium sulfide;attapulgite;fly ash;hydrated lime;pig manure;heavy metals;passivation |
| Author Name | Affiliation | E-mail | | LI Wen-jiao | School of Environmental Science and Engineering, Nankai University, Tianjin 300350, China | | | ZHANG Li | School of Environmental Science and Engineering, Nankai University, Tianjin 300350, China | | | LIU Dong-fang | School of Environmental Science and Engineering, Nankai University, Tianjin 300350, China | dongfangl@nankai.edu.cn | | HUANG Wen-li | School of Environmental Science and Engineering, Nankai University, Tianjin 300350, China | | | WEI Xiao-cheng | School of Environmental Science and Engineering, Nankai University, Tianjin 300350, China | | | WANG Zhen-dong | School of Environmental Science and Engineering, Nankai University, Tianjin 300350, China | |
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| Abstract: |
| The effects of sodium sulfide, attapulgite, fly ash and hydrated lime on the passivation of heavy metals in pig manure were investigated. The results showed that after 28 days of passivation, with a 1%(m/m) addition of sodium sulfide, the passivation rates of Cu and Zn were 86.84% and 65.64%, respectively. With a 10%(m/m) addition of attapulgite, the passivation rates of Cu and Zn were 87.86% and 32.82%, respectively. With a 10% addition of fly ash, 74.70% of Cu was immobilized in the treatment, but no passivating effect on Zn was observed. On the contrary, a 10%(m/m) addition of hydrated lime achieved a passivation rate of 26.59% on Zn, but activated Cu. Among these four passivating agents, sodium sulfide, attapulgite, and fly ash displayed a certain passivation effect on Mn in pig manure, but hydrated lime showed the opposite effect. Therefore, sodium sulfide and attapulgite can be used as passivating agents to effectively reduce the bioavailability of heavy metals in pig manure. |
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