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| Leaching characteristics of fly ash and concentrate treated by solidification method |
| CHE Ning1, SUN Ying-jie1, WANG Hua-wei1, HUANG Yao-min1, WANG Ya-nan1, ZHAN Mei-li2 |
1. Qingdao Solid Waste Pollution Control and Resource Engineering Research Center, School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China;
2. Municipal Solid Waste Management & Treatment Co., Ltd, Qingdao 266041, China |
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Abstract A cement solidification experiment was conducted by substituting waste incineration fly ash or compound silicate cement and garbage leachate concentrate for water to co-dispose fly ash and leachate concentrate. The solidification effect and the leaching behavior of heavy metals (Zn、Pb、Cd、Cr、As、Ba) were investigated under different fly ash dosages (40%, 50% and 60%). The results showed that the compressive strength of solidified body was decreased with the increasing dosage of fly ash, but there was no significant effects associating with the substitute of leachate concentrate for water. Differential effects of fly ash dosages on the leaching behavior of heavy metals were found in the experiment. The increase of fly ash dosage reduced the leaching of Zn, but increased the leaching of Pb and Cd in the solidified blocks. At the 36th day, the accumulated leaching concentration of Zn, Pb, Cr and As reached a stable status, while the concentration of Ba increased continuously. However, the leaching amount of heavy metals (Pb, Zn, Cd, Cr, and As) in the solidified blocks did not exceed the standard limits set in pollution control standard with the use of leachate concentrate, and thus, the process met the requirement of solidification treatment for leaching toxicity.
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Received: 16 May 2019
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