Garbage sorting seems to be a trivial matter, but it is related to the improvement of the living environment of more than 1.3 billion people and the sustainable development of the Chinese nation.The current garbage classification system has been gradually implemented, arousing strong social concern, garbage classification has become a new social fashion.Domestic waste has been effectively treated, but where should construction waste go?
In recent years, large-scale engineering construction has promoted China's economic development and improved people's living conditions.At the same time, a lot of construction waste is produced.There are four sources of construction waste in China: one is from the expiration of the building life, such as demolition of dilapidated houses.Second, it comes from urban construction.The planning of the new town, the reconstruction of the village in the city and the demolition of illegal buildings will produce a large amount of construction waste.Third, public buildings and home decoration.For instance old room is transformed, secondhand room business waits.Fourth, damage to buildings caused by natural disasters or human factors.In addition, the amount of construction waste produced during road construction and demolition also increases year by year.
According to the source classification, construction waste can be divided into engineering waste, decoration waste, demolition waste, engineering mud, etc.According to the classification of composition, construction waste can be divided into waste soil, concrete blocks, stone blocks, brick and tile fragments, waste mortar, mud, asphalt blocks, waste plastic, waste metal, waste bamboo and wood.It is understood that the current way to deal with construction waste is stacking, landfill, backfilling and resource treatment and so on.Among them, recycling is the best way.However, the comprehensive treatment and utilization of construction waste in China is still at a low level.In 2017, China generated about 2.4 billion tons of construction waste, of which about 120 million tons were used as resources, and the utilization rate was only about 5%.
The first reason is the lack of operable policies.At present, a large number of favorable industrial policies from the central government to local governments have brought new opportunities for the development of the construction waste recycling industry.However, most of these policies remain in the direction of guidance, difficult to guide the construction waste recycling industry to carry out specific work.Some cities lack long-term planning, and the design, construction and demolition still adopt the traditional extensive production mode, resulting in a large amount of construction waste.
Second, construction waste classification level is low.In general, only steel bars and other materials with high value can be effectively recycled, and most of the construction waste can only be collected in a mixed manner, without clear classification standards and requirements, which increases the difficulty of waste recycling and harmless treatment.
Third, China's construction waste resources development technology is not mature.Construction waste is "gold" in the wrong place. After sorting, weeding or crushing, most of the construction waste can be reused as renewable resources.In recent years, with the deepening of the concept of sustainable development in China, construction waste recycling technology has made breakthrough progress, but there is still a big gap with developed countries.
Construction waste is an inevitable product of urbanization at a certain stage. The recycling of construction waste requires the participation of the whole society, and the whole-process supervision should be implemented from the aspects of the discharge, classification, recycling and recycling of construction waste.
For the treatment of construction waste, the first step should be to reduce the source, that is, to reduce the generation of construction waste through scientific management and effective control measures before the generation of construction waste.Secondly, effective means should be adopted to make waste become renewable resources.Therefore, it is necessary to carry out innovative research on construction waste collection, classification, treatment and other related technologies, and gradually establish the relevant standard system in the field of construction waste recycling and utilization in China.Finally, it is necessary to improve relevant laws and regulations, strengthen positive incentives for the production and use of construction waste recycling products, and increase the preferential policy, so as to ensure the recycling and reuse of construction waste to the greatest extent.