• Journal of Korean Society of Environmental Engineers
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• v.37 no.7
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• pp.412-417
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• 2015

This study investigated to recycle geobond and ash produced in thesewage sludge incinerator using reduction/stabilization. Nonsintering process was performed by binding cement (High Early Strength Portland cement, Micro cement), geobond and sand mixed with sewage sludge ash (SSA). Chemical ingradients of the sewage sludge ash was mainly composed of $SiO_2$, $Al_2O_3$, $Fe_2O_3$, CaO and others, which were similar to those of the each binders consisting High Early Strength Portland cement, Micro cement and geobond. Results showed that unconfined the long term compressive strength could be obtained components of sewage sludge ash. It exceeded more than double score 64.6 MPa of the Korean standard ($22.54MPa=229.7kg/cm^2$). Microstructure of solidified block for the different admixture was related to the compressive strength according to SEM analysis. Optimum mixing range of the sewage sludge ash to each binders were found to be 10~40% which can widly safely regulate the confined a long term compressive strength. The best binder of long term compressive strengh was revealed Geobond more than High Early Strength Portland cement and Micro cement. This study revealed the sewage sludge ash can be partial replacement of the inorganic binder & application block for recycling.

• Journal of Korean Society of Environmental Engineers
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• v.36 no.12
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• pp.843-850
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• 2014

This study investigated to recycle ash produced in the sewage sludge incinerator using reduction/stabilization. Nonsintering process was performed by binding cement, geobond and sand mixed with sewage sludge ash (SSA). Results showed that unconfined compressive strength could be obtained components of sewage sludge ash. it exceeded more than double score of the 22.54 Mpa ($229.7kg/cm^2$) Korean standard. chemical ingradients of the sewage sludge ash was mainly composed of $SiO_2$, $Al_2O_3$, $Fe_2O_3$, CaO and others, which were similar to those of the each binders consisting cement and geobond. microstructure of solidified speceimen for the different admixture was related to the compressive strength according to SEM analysis. optimum mixing range of the sewage sludge ash to inorganic binder was found to be 10~40% which can widly safely regulate the confined compressive strength. This study revealed the sewage sludge ash can be partial replacement of the inorganic binder for recycling.