| Autor: |
Fanyong Song1, Shugen Liu1, Nanwen Zhu1 nwzhu@sjtu.edu.cn, Haiping Yuan1, Lin Gu1 |
| Předmět: |
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| Zdroj: |
Fresenius Environmental Bulletin. 2012, Vol. 21 Issue 6a, p1548-1555. 8p. |
| Abstrakt: |
Solidification is broadly used for the pretreatment of dewatered sludge before landfill. Acids extraction is one of the various technologies used in the removal of heavy metals from contaminated sewage sludge. This study investigated the effects and influences of different acid solutions in dewatered sludge (DS)'s solidification process. 1 ml H2S04 (98%)/ 20g dry DS samples showed the best results in compressive strength tests: 1735 kPa, 2420 kPa and 2750 kPa compared to 1013 kPa, 1424 kPa, 1712 kPa of DS+B samples which were cured for 7 days, 14 days and 28 days respectively. pH values in the leachate of sam- pies treated by acids were around 8 compared to 9.45 of IDS+B sample. TCLP results showed samples treated by acids had considerably lower heavy metal concentrations in leachate than the ones that were not treated by acids. XRD and SEM helped us to learn the mineralogy and morphology of samples. [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
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