| Title |
Solidification of Digested Sewage Sludge With Fly Ash |
| Authors |
조진규(Jin Kyu Cho),김성호(Sung Ho Kim),김응호(Eoung Ho Kim) |
| Abstract |
This study was performed to evaluate feasibility of fly ash as a solidifying agent for the solidification of sewage sludge. The unconfined compressive strength and pH were observed with during time and mixing ratio, and heavy metal leaching test was performed. Also, XRD, SEM and EDS analysis was performed for the microstructure analysis of the solidified sewage sludge. Immaterial increase of unconfined compressive strength was shown for the sewage sludge mixed with fly ash as a solidifying agent, but the unconfined compressive strength was increased highly for the use of quicklime as a solidifying aid. So, It is possible to use fly ash as a solidifying agent mixed with a small quantity of quicklime. The results of leaching tests was shown that the concentrations of leachate heavy metals(Cu, Pb, Cd and Cr^(6+)) were lower than the Korea toxic waste criteria. The microstructure analysis by SEM was shown that needlelike crystals appeared as the solidification proceed. The analysis of these crystals by EDS confirmed that these main components were Ca, Si etc. Also, XRD analysis was shown that the main solidification products was CSH. |