摘要(英) |
Abstract
To carry out a conception of Sustainable Development, the use of traditional sludge treatments to treat sewage sludge is becoming insufficient and inadequate. It’s a serious assignment in the future for sewage sludge ash(SSA) treatments to achieve the purpose of Resource、Reduction、Stablization and Safety. From literature review it is widely perceived that SSA could be used to produce lightweight aggregate, which can be applied as a construction material. However, many parameters of the abovementioned production will affect the utility of lightweight aggregate. The object of this research is to analyze the effects of compacting pressure on the bloating mechanism of sludge ash and the mechanism properties of the derived aggregates.
The sewage sludge ash pellets used in this study were prepared from the sewage sludge cake collected from a secondary sewage treatment plant (Minsheng STP, Taipei). The sludge ash were pulverized and pellitized using various compacting pressures ranging from 1,000~5,000psi, followed by sintering at temperature ranging from 1,070~1,100 C for 20~30 min. to determined for the effects of compacting pressure on their bloating mechanism and mechanic properties.
From the experiment a positive relation trends can be seen between the swelling、compacting pressure、the sintering temperature and the sintering time. In general, for various compacting pressure tested, all sludge ash pellets bloated to a density of 1.6 g/cm3 when sintered at the temperature 1,080 C﹔Combination of higher temperature (1,100 C, 30min.) could generate aggregates with density less than 1g/cm3. Furthermore, a positive relation trends can be seen between the swelling and compacting pressure and/or the sintering temperature. For instances, at 1,100 C for 30min. sintering, the pellets with compacting pressure 1,000psi and 5,000psi could result in a swelling of 42.0% and 69.2%, respectively. It can be concluded from the results of this study cited above that the compacting pressure can positively affect the bloating of ash-derived aggregates at temperature ranging from 1,070~1,080 C, whereas at temperature higher than 1,080 C, temperature may governs the densification, resulting no significant difference among pellets formed with different pressures ranging from 1,000psi to 5,000 psi. |
參考文獻 |
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