Lightweight aggregate made from sewage sludge and incinerated ash.
In this study, sewage sludge ash (SSA), with similar characteristics to expansive clay, was used as the principal material and sewage sludge (SS) as the admixture to sinter lightweight aggregate and to study the influences of raw material composition on pelletising, sintering effect and aggregate properties. Results showed that both SS and SSA could be sintered to produce synthetic aggregates individually or mixed. Increasing the amount of SS would decrease the pelletising ratio. Under the consideration of energy saving, the mixture of SSA was better for sintering normal weight aggregate. On the contrary, the mixture that added 20-30% of SS was more adequate to make lightweight aggregates. Adding SS would enhance the oxidation-reduction reaction and lower the bulk density and sintering temperature of aggregates to save energy. Sintering temperature affected the properties of sewage sludge ash lightweight aggregate (SSALA) more than retention period did. Prolonging the retention period could improve bloating effect.
Chiou
Ing-Jia
IJ
Department of Civil Engineering, Nanya Institute of Technology, Graduate Institute of Environmental Engineering, National Central University, 414, Sec. 3, Chung-Sun E. Road, Chungli, Taoyuan 320, Taiwan, ROC. Jessie.chiou@msa.hinet.net
Wang
Kuen-Sheng
KS
Chen
Ching-Ho
CH
Lin
Ya-Ting
YT
D003247:Conservation of Natural Resources / Q000379:methods; D017745:Incineration; D008855:Microscopy, Electron, Scanning; D010316:Particle Size; D012037:Refuse Disposal / Q000379:methods*; D012722:Sewage / Q000032:analysis* / Q000737:chemistry; D013696:Temperature
D012722:Sewage