I, treatment status
China's garbage disposal started late, low capacity of harmless garbage treatment, there was a serious situation of garbage surrounded by the city. Since 2006, China's environmental sanitation industry has had a greater development, so that the level of urban garbage disposal improved, the phenomenon of garbage surrounded by cities has been eased. However, there are still some problems, the investment in garbage disposal is still obviously insufficient compared with the demand for garbage disposal, the level of garbage disposal is still very low, and urban domestic garbage disposal is still in the stage of development from rough to treatment. The main manifestation is the prevalence of garbage dumping phenomenon, and the secondary pollution of garbage disposal site is quite common. China's urban construction waste disposal presents the following problems:
①The degree of classification and collection of construction waste is not high, only the vast majority of mixed collection.
②Construction waste recycling rate is low.
3 China's construction waste treatment and resource utilization technology level is backward, urban construction waste treatment is mostly used in direct landfill treatment, which occupies land and pollutes the environment.
④Little investment in the treatment of urban construction waste, policies and regulations are not sound, and the environmental awareness of construction workers is not strong.
Second, the treatment of the situation
Construction waste disposal is imminent, a large number of urban demolition, producing a large amount of solid waste, the hazards of construction waste has been given in detail. But encountered construction waste how to deal with, today I will bring you together to discuss the construction waste crushing, construction waste treatment, construction waste reuse points of view?
Where does the construction waste go?
Currently, in the new city construction in full swing, the pace of urban village transformation, demolition, demolition of illegal, old city renovation and other projects continue to speed up the implementation of the city has become more and more beautiful at the same time, the amount of construction waste generated is increasing day by day, becoming another major difficulty in environmental protection. Construction waste is like a companion of urban construction "sores", not only encroach on the land, but also a serious impact on the surrounding environment, and even bring the danger of siege, if not timely and effective management, will be endless. Urban construction waste management is expected to break the game, but a long way to go.
City construction speed up, the number of garbage continues to surge. 2011 June all over the reconstruction and transformation of the work of urban village redevelopment project site, painted, more than one person high in the fence, was demolished to the side of the building of a thousand holes, there is no transported a large number of construction debris scattered in the hundreds of acres of open space. And in part of the district renovation construction site, a variety of large-scale demolition machinery is running at full speed, a house instantly fell to the ground, in the rising clouds of dust and fog into more and more construction waste in a moment.
The construction waste at these two sites is only a microcosm of the hundreds of construction sites in China's major cities. According to the relevant regulations, construction waste in the main urban areas can only be transferred at night during a fixed period of time. At such times, groups of dump trucks traveling through the city streets, the sound of rumbling cars, the scene is very spectacular. Nevertheless, the construction waste generated in the city has not seen less, and still grows here and there.
Continuing irregularities, the pollution situation is becoming increasingly serious. For a long time, a huge amount of construction waste, in the public's life at the same time, but also to the urban environment buried more pollution hidden danger. It is understood that since 2008, due to the lack of uniform and perfect construction waste management methods and standardized disposal sites, the city a large amount of construction waste more to take the simple way of throwing, landfills and other disposal.
Encroachment of land, landfills, see the dust, and even sewage from the garbage heap on a rainy day, just the tip of the iceberg of the impact of serious environmental pollution caused by construction waste. It is understood that, as construction waste in the construction of glue, paint, paint and other polymer materials are difficult to degrade, and contains harmful heavy metal elements, they are buried underground, will pollute the groundwater, directly endangering the lives of residents around.
It is well known that with the continuous development of science and technology, construction waste has long been seen as a misplaced resources. Recycling is stumbling and problem solving is imminent in China, where exactly is the way back for construction waste?
It is understood that the National Engineering Research Center for Waste Resource Utilization in the transformation of urban villages in the city of construction waste in the problem of in-depth investigation that, since 2007, the construction of major cities in the production of construction waste has shown a huge number of new features such as the generation of a centralized cycle, in order to change the status quo of the construction waste is still mainly to take the backfill, landfills and open piles of the main way, the urgent need for a new treatment channel! In order to change the status quo of construction waste, which is still mainly backfilling, landfilling and open piles, new treatment channels are urgently needed. Huge construction waste, the cities to resource-oriented treatment,
Engineering waste will be backfilled, reclamation, mulching and greening, and gradually reduce the proportion of backfill and landfill disposal of construction waste to a new type of resource-based treatment base to replace the traditional waste disposal site. 2012, Kunming City, built 1 ~ 2 advanced technology level, equipment level and management level of standardized treatment of construction waste Demonstration project, the main city of 4 districts each built a transitional construction waste disposal site and put into operation, complete the city's construction waste resource treatment project productivity layout, by the end of 2012, and strive to achieve the city's construction waste disposal rate of 100%, resource utilization rate of 95% or more of the target.
Three, processing countermeasures
Not only do we need to consider the problem of construction waste generation, but also consider its related processing and subsequent operation, and then in the process can be very good treatment. In turn, it can also speed up the construction of the project. It is also necessary to consider the corresponding safety hazards and pollution of the environment in the process of generating construction waste, and then achieve the desired results.
China's cities need to pay attention to the following important issues in the treatment of construction waste:
① Attach great importance to effectively strengthen the organization and leadership. The treatment and recycling of construction waste is a systematic project, involving all levels of society, how to deal with the need for organizations to coordinate and solve the problem, the relevant units of building construction should stand in the politics, the overall situation, the height of stability, to further unify the thinking, raise awareness, division of labor, and all together to grasp the **** management; to establish and improve the slag set up and management of the special program for the construction of the site slag generation, Dust control measures, disposal and other unified leadership, unified management.
②Improve the level of technical processing of construction waste. Urban construction waste is generally used directly to landfill treatment, the lack of effective technical treatment of construction waste. Especially for construction waste as concrete aggregate must be crushed, screened and graded, cleaned and stockpiled technology domestic enterprises have little research. The relevant departments of the city should help coordinate and rely on enterprise technology research and development as soon as possible to solve the technical problems in the construction of waste disposal and other aspects.
③Reduce the environmental pollution of construction waste. China's construction waste treatment technology and recycling rate is low, most of the construction waste is transported to the landfill or landfill, not only occupy a large number of valuable arable land, but also on the soil, water, vegetation and other natural environment has caused considerable harm. At the same time, the transportation process has caused serious pollution to the urban environment, seriously affecting the urban environment and city image.
So for those who sort out the garbage that can not be used should be reasonably disposed of to minimize the pollution of the environment.
④The government should provide financial guarantee for construction waste disposal. Construction waste is not a commodity, itself has no value, only after processing and reuse will produce new value. In the recycling of construction waste treatment and utilization process, often make the processing unit no profit can be made, the lack of enthusiasm, directly affect the utilization of the work, therefore must be given by the government through some channels in the utilization process of economic subsidies.
⑤Establishment of sound and reasonable policies and regulations. In recent years, China's importance of construction waste recycling and reuse has been recognized, but has not yet attracted sufficient attention. The country has not yet established perfect relevant laws and regulations, the penalty regulations for violation of the provisions of the prohibition of landfill available construction waste and the provisions of the construction waste must be classified collection and storage of the provisions are not perfect. Therefore, relevant policies and regulations should be introduced to implement an effective system of rewards and penalties.
Four, treatment
With the accelerating process of urbanization, the number of construction waste generated and discharged in the city is also growing rapidly. People are enjoying the urban civilization at the same time, but also suffer from the troubles brought by the urban garbage, of which the construction waste occupies a considerable proportion, accounting for about 30% to 40% of the total amount of garbage, so how to deal with and make use of more and more construction garbage has become an important topic faced by the government departments at all levels and the construction garbage disposal units.
Many of the wastes in construction waste can be reused as renewable resources after sorting, removing or crushing, mainly:
(1) Using waste construction concrete and waste masonry to produce coarse and fine aggregates, which can be used to produce concrete of the corresponding strength grade, mortar or prepare building materials products such as blocks, wall panels and floor tiles. Coarse and fine aggregates can also be used for highway pavement base after adding curing materials.
(2) Utilizing waste bricks and tiles to produce aggregate can be used to produce recycled bricks, blocks, wall panels, floor tiles and other building material products.
(3) The residual soil can be used for road construction, pile foundation filler, foundation base, and so on.
(4) For waste wood construction waste, the wood that has not yet been significantly damaged can be directly reused to rebuild the building, and the badly damaged
wooden components can be used as raw materials for wood recycled panels or for paper making and so on.
(5) waste pavement asphalt mixture can be used directly for recycled asphalt concrete in appropriate proportions.
(6) Waste road concrete can be processed into recycled aggregates used to formulate recycled concrete.
(7) Waste steel, waste steel bars and other waste metal materials can be directly reused or processed back to the furnace.
(8) Waste glass, waste plastics, waste ceramics and other construction waste are utilized differently depending on the situation.
(9) Waste bricks and tiles are burnt clay-like materials, which have volcanic ash activity when crushed and milled into powdered materials, and can be used as concrete admixture, replacing fly ash, slag powder, stone powder and so on.
For more information about the tender writing production, to improve the winning rate, click on the bottom of the customer service free consultation.