The construction waste recycling business is gradually on the right track, and local governments have also introduced relevant policies to support the steady development of the industry. However, due to the late start, there are still various problems in my country's construction waste disposal:

1. Although the construction waste has been processed, the disposal site is still insufficient

On the one hand, the daily processing capacity is at least thousands of tons, but it is difficult to consume such a large amount of materials only for making bricks or plates; on the other hand, even if the deep processing of construction waste is not affected, the maintenance and stacking of finished products , all require a large number of sites to cooperate, which will easily cause a backlog of products, or even stop production, and seriously interfere with the "digestion" capacity of the treatment plant.

2. The equipment is outdated and cannot be sorted

Taking construction waste brick manufacturers as an example, most of them use fixed crushing equipment, so it is impossible to classify construction waste, so that brick products produced from raw materials of different qualities are light in weight, heavy in weight, and strong in strength. Soft and hard, the product quality is very unstable.

3. Cause secondary pollution to environmental protection projects

The reuse of construction waste is itself an environmental protection project. Therefore, secondary pollution should be avoided in terms of noise, dust, smoke, etc.

4. Using fixed crusher equipment, the cost of garbage transfer in the site is high

It is understood that the area of construction waste piled up in the construction waste treatment plant accounts for more than half of the total plant area. Using a fixed crusher requires a lot of manpower and material resources to concentrate the construction waste at the crushing port for processing. . Accumulated over a long period of time, the amount of this on-site transfer fee is quite astonishing.

Application of new processing mode

At present, in developed countries such as Europe and the United States, the vast majority of construction waste treatment plants use advanced and environmentally friendly mobile crushing equipment. This equipment can effectively solve some of the above-mentioned problems, and the application range of aggregates produced and processed will also increase. It is mainly used in municipal, highway and construction industries, and a small part is supplied to brick factories or other industries. The air volume of the construction waste place is about 2000 cubic meters/h. The dissolved oxygen at the outlet of the mixed liquor in the biochemical tank is about 1.0 mg/L, and the whole biochemical system is basically in a dry and slightly exposed state, so as to maximize the activity of the sludge without causing the sludge to settle, and operate as the aerobic section of the biochemical tank of the plant control target. At the same time, shortening the residence time of sewage in the biochemical tank is also an effective method to indirectly inhibit the oxidation of microorganisms themselves. During operation, the anaerobic section can be closed, the hydraulic process can be shortened, and the hydraulic retention time can be reduced from 92h to 7.4h. Through process adjustment, the A square /O process can be improved to the A/O process operation, and the organic matter entering the aerobic section can be improved as much as possible. amount of substance. Practice has shown that such operation can make full use of the nutritional substrate value of organic matter and reduce the degree of self-oxidation of microorganisms.

Based on the above reasons, construction waste treatment plants have turned to the exploration of new models, mainly advanced and environmentally friendly mobile crushing equipment. This equipment can effectively solve the above problems, and the application scope of the aggregate produced and processed also increases accordingly, mainly used in municipal, highway, and construction industries, and a small part is supplied to brick factories or other industries.

Most construction waste treatment plants exist in the form of a "material supply base". The construction waste is sorted first, and then used for municipal road and highway construction. Such as: cement stabilization layer processing, sidewalk base, construction access road construction, pipe pit backfill, soft foundation treatment, etc. This processing mode has been verified by operation in recent years, and has not only created considerable economic benefits for the enterprise, but also brought excellent social effects.

At present, my country's construction waste recycling projects are generally concentrated in large and medium-sized cities, and the land in cities is relatively tight. The advantages of choosing the model of building construction waste treatment plants into "material supply bases" are obvious: 1. Relatively small investment, easy to use Management; 2. Less land is needed for building a factory, and material turnover is fast; 3. Advanced mobile crushing equipment is used for operation, which is environmentally friendly and does not easily cause secondary pollution. When the processing volume is large, it can also go to the construction site to complete the crushing task, saving freight and reducing Traffic pressure; 4. Reduce the transfer cost of construction waste in the site, and the operating cost is low.

Of course, this treatment mode requires various government departments to formulate relevant supporting policies, such as formulating environmental protection standards for construction waste treatment plants, material standards for aggregates produced from construction waste, construction units, brick factories, concrete mixing stations and other enterprises. Preferential policies for waste aggregates and so on.