Hydrothermal solidification of municipal solid waste incineration fly ash
Hydrothermal solidification of municipal solid waste incineration fly ash
复制标题
城市生活垃圾焚烧飞灰水热固化
DOI：
10.1007/s11164-011-0287-x
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发表时间：
2011-02
影响因子：
3.3
通讯作者：
Lu, Lei
中科院分区：
文献类型：
--
作者：
Shan, Chengchong;Zhenzi Jing;Pan, Lili;Zhou, Lei;Pan, Xiaohui;Lu, Lei
在200 °C饱和蒸汽压下，对添加石英粉的城市垃圾焚烧飞灰进行了48 h的水热固化试验。为了进一步提高固化体的强度，对粉煤灰原料进行水洗预处理，并加入2 M NaOH溶液作为反应溶剂。试验结果表明，养护时间和养护温度对强度发展有显著影响。强度发展主要是由于雪硅钙石的形成，石英和NaOH溶液的加入促进雪硅钙石的形成。原粉煤灰也可以用作固化垃圾焚烧底灰的添加剂，并且在原粉煤灰添加量（10%）下，固化试样的抗弯强度达到21 MPa以上，这表明回收100%垃圾焚烧灰（例如，10%粉煤灰+90%底灰）的高潜力。进行浸出试验以确定从固化试样中溶解的重金属的量。结果表明，在本研究的水热条件下，重金属的浸出率很低。因此，水热处理方法可能具有大规模回收/再利用垃圾焚烧飞灰的高潜力。
Hydrothermal solidification of municipal solid waste incineration (MSWI) fly ash has been conducted under saturated steam pressure at 200 °C for up to 48 h with quartz addition. To enhance the strength of solidified specimens further, the raw fly ash was pre-treated by water-washing and mixed with NaOH solution (2M) as reaction solvent. Experimental results showed that curing time and temperature had significant effects on strength development. Strength development was found to be mainly due to tobermorite formation, and addition of quartz and NaOH solution promoted tobermorite formation. The raw fly ash could also be used as an additive to solidify MSWI bottom ash, and with raw fly ash addition (10%) the flexural strength of solidified specimens reached more than 21 MPa, suggesting high potential to recycle 100% MSWI ash (e.g. as 10% fly ash + 90% bottom ash). Leaching tests were conducted to determine amounts of heavy metals dissolved from solidified specimens. The results showed that under the hydrothermal conditions of this study, leaching of heavy metals was very low. As such, the hydrothermal processing method might have high potential for recycling/reusing MSWI fly ash on a large scale.
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