Construction waste refers to the soil, residue, mud, and other waste generated during the construction, demolition, repair, and residential decoration of buildings, structures, etc. by construction units or individuals. It mainly consists of slag, crushed stones, brick and tile fragments, concrete blocks, waste plastics, waste metal materials, waste bamboo and wood, etc.
So, what issues usually need to be considered when constructing and operating a construction waste treatment project?
1. The total amount of construction waste needs to be guaranteed
The source of construction waste should be no less than 10000 tons of construction and demolition waste per year, and the amount of decoration waste should not be lower than expected. Because the initial investment was huge. After the completion of the resource chemical plant, the total amount of construction waste is the key to its survival. If the total amount of construction waste cannot be guaranteed, the government needs to provide relevant support and protection to enterprises to avoid approving new similar projects.
2. Specific treatment plan for light materials
For example, with an annual processing capacity of 200000 tons, about 700 tons of construction waste need to be processed every day, including polyester materials, plastics, etc. The best solution currently is thermal power generation, which requires coordination and coordination at the government level. If the processing cost is relatively high, as the existing plan does not include the cost of light material processing, further communication is needed on the cost of light material processing. From the perspective of environmental protection, due to the presence of plastic in light materials, combustion for power generation is prohibited, and both parties should also negotiate appropriate disposal methods in the later stage.
3. Construction waste removal work
It is necessary to clarify whether construction waste is sent to the construction waste treatment plant by relevant departments. If it cannot be guaranteed, who will bear the cost of whether the clean transportation team will be self built or outsourced? Assuming a total processing capacity of 200000 tons, nearly 700 tons of garbage need to be cleared and transported daily, and finished aggregates need to be transported; Whether to transfer the management rights to other construction waste resource utilization plants. Changsha and other cities have recently released franchise plans for construction waste management, implementing franchise operations for the disposal of waste (including road asphalt waste), engineering waste, and decoration waste resources, with a certain period of time (15-30 years), and strictly supervising the daily disposal behavior of franchise enterprises in accordance with franchise contracts. Explore the inclusion of demolition, transportation, and disposal processes in the scope of construction waste resource utilization franchising, and form a fully enclosed disposal model throughout the entire chain.
4. Policy subsidies for construction waste disposal
Construction and decoration waste (complicated treatment process, high cost, high added value, and extreme): refer to 50-100 yuan/ton in other places; Construction demolition waste: appropriate subsidies. In the case of free disposal, referring to the existing out of town disposal plan, establish a construction demolition waste removal fee of 1.15 yuan/ton/kilometer. (The current model is based on a 20 ton vehicle, with a fixed price of 200 yuan/vehicle; due to the fact that the factory is about 20 kilometers away from the city center, which is 0.5 yuan/ton/kilometer, the cost of land transportation is relatively high. It is recommended to follow the implementation standard of 1.15 yuan/ton/kilometer in other regions.)
5. Support for the promotion of recycled products
Inviting local state-owned enterprises to participate, such as Chengfa, Huantou, and Municipal, ensures the sales of recycled products. Secondly, we should strive to support policies and refer to the management measures recently released in Shenzhen, Hunan, and Henan; Under the premise of ensuring quality, price, and performance, construction waste comprehensive utilization products should be prioritized in areas such as building engineering foundation brick tire film, internal space partition wall, road and bridge engineering cushion layer, base layer, rail transit engineering basement floor cushion layer, basement roof backfill layer, municipal pipeline and comprehensive pipe gallery engineering pipe trench cushion layer, cable trench cover plate, garden engineering sidewalk tiles, square tiles, water conservancy engineering riverbed protection masonry, drainage edge, etc.
6. Details of factory infrastructure (considering infrastructure costs, convenient transportation, geological conditions, easy access to water and electricity)
Determination of specific factory design drawings, construction plans, project costs, and construction schedule;
7. Site selection considerations for the factory area
Taking into account the location of the factory area, surrounding conditions, water and electricity usage, distance from the city center, and convenient transportation, etc;
8. Implementation of supporting facilities for Phase I projects related to the factory area
At present, the design of recycled products mainly includes: recycled aggregates, recycled metals, recycled powders, recycled bricks, recycled concrete, etc., in order to alleviate the pressure of local natural building material resources, improve recycling utilization rate, improve process flow, enhance processing efficiency and industrial supporting facilities. It is necessary to increase the production lines for recycled bricks and recycled concrete.
