How to dispose of construction waste?

With urban development, the amount of construction waste is increasing.  How can we dispose of this rapidly growing amount of construction waste in a more environmentally friendly way? Temporary on-site resource utilization facilities are becoming a new option.

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The construction waste generated from demolishing old buildings, after resource utilization treatment, is transformed into fine aggregates, which are then processed into recycled bricks and other building materials for use in new construction. They are often used for filling foundations, building non-load-bearing walls, or as road base material under asphalt roads. Recycled aggregates can also be used in newly built parks, forming continuous small hills through landscaping.

Finished crushed stone

Before the on-site resource utilization solution, the two main resource utilization methods in China were fixed treatment plants and mobile crushing stations, both of which have their disadvantages. Although fixed treatment plants have large processing capacity and high environmental standards, and can become part of the urban infrastructure after completion, their construction period is long. The other disposal method—mobile crushing stations—involves bringing engineering machinery to the construction site, where it can crush construction waste after refueling. Although these small machines are flexible and mobile, they produce a large amount of dust during production due to open-air operation. Furthermore, today's construction waste has a complex composition, and small machines can only perform basic screening, making it difficult to handle highly mixed waste.

Manual sorting

Industry experts say that construction waste also has different "grades": the first category is excavated soil, which is clean soil and has inherent value, and can be sold directly to other projects; the second category is good quality concrete, which still meets strength and hardness standards after crushing and can also be circulated in the market; the third category is more difficult to handle, which is mixed construction waste containing bricks and tiles, requiring significant investment.

The process of resource utilization of construction waste is complex and therefore costly. On the production line, construction waste undergoes two stages of crushing and multi-stage screening, and is subjected to two rounds of "vibrating air separation machines" and manual sorting to separate light materials from the waste, ultimately producing reclaimed soil and recycled aggregates. The reason for so many processes is that construction waste includes not only soil, bricks, and concrete, but also a large amount of plastic, wood products, and insulation materials, as well as some harmful substances. Only a complex integrated production line can handle this.