Diversified Reuse of Incineration Recycled Aggregate
Kaohsiung City processes a large amount of waste annually, with incineration producing approximately 180,000 tons of incinerator bottom ash. To reduce the burden on landfills and integrate waste circular economy with carbon reduction actions, the city actively promotes the reuse of incinerator bottom ash. After processing, the bottom ash can be transformed into incineration regenerated aggregate, which is applied in public engineering projects, replacing natural aggregates. It can also be used in brick products, Jersey barriers, and curb stones, among other cement products, for diverse reuse.
Reuse Process and Applications
Before delivery, incineration regenerated aggregate must pass tests for dioxins, particle size, impurities, and heavy metals to ensure its safety and quality. These aggregates can be used in controlled low-strength material (CLSM), road base filling, low-density permeable concrete, and even manufactured into brick products and other cement products.
Promotion and Achievements
To ensure the stable supply and quality of incineration regenerated aggregate, the Kaohsiung City Environmental Protection Bureau has established a certification system for pre-mixed concrete factories and a road permit system. These measures have significantly increased the reuse of bottom ash in Kaohsiung City, with a reuse rate of 100% achieved by 2019. Additionally, Kaohsiung City's use of incineration regenerated aggregate ranked first in Taiwan in 2024, reaching nearly 180,000 tons, replacing natural aggregates and potentially reducing carbon emissions by 2,462 tons.
Incinerator Bottom Ash Reuse Process Diagram
Cement Products Containing Regenerated Aggregate:
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Jersey Barriers
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High-Pressure Pavers
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Incinerator Bottom Ash Processing Plant:
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Bottom Ash Processing Facilities
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Production of Incineration Regenerated Aggregate
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Use of CLSM Containing Regenerated Aggregate in City Engineering Projects
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