More and more construction waste, has gradually "surrounded" our cities and places of residence, daily life, we can deeply feel the impact of the existence of rubbish. such as dust pollution, stinking, sewage and so on, but, in addition to these, construction waste if not through ap Propriate treatment, the harm caused by more than these.
As the amount of urban construction waste increases, the number of garbage dumps is also increasing, and the area of garbage dumps is gradually expanding. The phenomenon of rubbish and people competing for land has reached a very serious stage. Unprepared landfills of unprocessed construction wastes not only occupy a large amount of production land, which further exacerbates the contradiction between people and land. In addition, non-degradable heavy metals in construction waste will directly infiltrate the soil layer, causing land to be harvested and harvested, or producing toxic crops, which will seriously affect China's food safety.
inducing haze January 25, 2015, the Beijing municipal government to the NPC submitted a "Report on the implementation of the Beijing Municipal Air pollution Prevention Regulations", the Beijing Atmospheric environment PM2.5, motor vehicles, coal, industry, building dust and food and other emissions of the local pollution rate is 31.1%, 22.4% respectively, 18.1%, 14.3% and 14.1%. These 14.3% include dust generated during the demolition of buildings, construction waste can not be effectively cleaned up in time, without taking measures such as enclosure, thatch, solidification and so on, which leads to the direct exposure of construction waste to the air, the dust caused by wind-blown disturbances, the rolling of motor vehicles, and the transportation or removal of construction rubbish.
The dust produced by disorderly dumping, and has a longer duration.From the living conditions and reactions of residents in the city, it can be clearly seen that construction waste and dust pose great inconvenience to the urban environment. Take some of the examples I have seen. For example, in a city, on a major road, due to poor urban management, some large-scale cement tankers and cement trucks often pass through, and these vehicles have never covered the transported goods. As a result, dust from cement dust and construction debris will fly everywhere. It was not until one year later that the local government could not bear to carry out remediation and restrict the passage of these vehicles, only to see that the road environment slowly recovered. However, a few kilometers away, even a dozen kilometers due to dust pollution, the local residents have also carried out a lot of self-cleaning after half a year, but still have little effect, in the dry and windy season, the impact is far. Obviously, these invisible adverse effects are deep. If you can manage well and deal with these garbage in time, you can minimize the damage.
Because of improper construction management, resulting in dust, fog and haze weather causes accounted for 14.3%, because construction in the structure of the construction of the concrete is rarely dust, the main source of dust is later decoration stage or the construction of garbage in the process of waste residue scattered, The gases emitted during the transportation of automobiles also play an important role in the environmental pollution and the formation of haze weather.
During the stacking and landfilling of construction waste, leachate or leachate, which is leachable due to fermentation and leaching of rainwater, erosion, and soaking of surface water and groundwater, can cause serious damage to the surrounding surface water and groundwater. Pollution. Due to the large amount of calcium silicates and calcium hydroxide contained in the waste mortar and concrete blocks, a large amount of sulfate ions contained in the waste gypsum, and a large amount of heavy metal ions contained in the waste metal materials, the infiltrating water generated by the construction yard garbage is generally It is strongly alkaline and contains a lot of heavy metal ions, hydrogen sulfide, and a certain amount of organic matter. If it is not controlled, it will cause serious pollution of groundwater, rivers and lakes. The landfill leachate contains not only a large amount of organic pollutants, but also a large amount of metal and non-metallic pollutants, and the water quality components are very complicated. Once you drink this contaminated water, it will cause great harm to the human body.
polluting the atmosphere In the process of building rubbish stacking, under the action of temperature and water, will decompose, produce harmful gases, waste gypsum contains a large number of sulfate ions, sulfate ions in anaerobic conditions will be converted into a smelly egg odor of hydrogen sulfide, waste paper board and waste wood in anaerobic conditions can be dissolved lignin and tannin and decomposition of the formation of volatile organic acids, The harmful gas emitted into the air can seriously pollute the atmosphere.
and the building garbage in the bacteria, dust with the wind, a small amount of combustible construction waste in the incineration process will produce toxic carcinogens, resulting in air pollution two times.
Urban green space and marginal areas often become temporary distribution centers for urban construction waste. The construction sites are often used as temporary storage places for construction waste. Due to the convenience of construction and lack of proper protective measures, under the influence of external factors, construction waste piles appear. Collapses that hinder roads and even rush to other buildings occur from time to time. In the suburbs, the pits and ponds are the preferred dumping ground for construction waste, which not only reduces the ability to regulate and store water bodies, but also leads to the reduction of surface drainage and flood discharge capacity. There are safety hazards that cannot be ignored, “12.20 of Shenzhen Guangming New District” "The construction landfill landslide event is a painful lesson!
Impact on cityscape and sanitation The city interior space is limited, but the city construction rubbish occupies the space to be big, the stacking is disorderly, with the city whole phenomenon extremely uncoordinated, the urban green space often becomes the urban construction rubbish temporary distributing center. It can be said that urban construction waste has become an important factor to damage urban green space, is the direct and indirect destruction of the city's appearance.
The construction waste which has not been transferred in the process of construction is often the sanitary corner of the city.
In recent years, some cities have implemented a bagging system for domestic waste, but due to the existence of construction waste dumps or their remains, this system has been hindered to a certain extent. Its existence has become a direct cause of the scattered accumulation of domestic garbage. If urban construction waste mixed with domestic garbage cannot be properly treated, it will overflow with dirty water and foul smell when it encounters rain, and it will often become a breeding ground for bacteria. The issue of the removal of rubbish, dust, dust and dust during transportation of construction wastes has seriously affected the appearance and landscape of the city.
With the development of the Times, construction waste is considered to be the most development potential, inexhaustible "city mineral", is "misplaced resources." Although China's construction waste treatment industry started late, but in recent years, the rapid development of construction waste treatment market has been from the import period into the growth period, and is moving towards maturity. With the development of the Times, the construction of waste resources, bring profits at the same time also protect the environment.
In the face of the increasingly prominent urban construction waste problem, many successful practices in developed countries can provide us with sufficient reference. According to estimates of 5 billion tons of newly-generated construction waste in China by 2020, if these construction wastes can be converted into ecological building materials after treatment, the value created can reach 1 trillion yuan. Most of the waste in construction waste can be reused as a renewable resource after being sorted, rejected, or crushed. Adding a small amount of auxiliary materials can be used to make dry mixed mortar, hollow bricks, etc., with various boulevard bricks, roadbeds, and ash, etc. . At present, with the increasing emphasis on environmental construction by government departments, construction waste disposal will soon receive more powerful national policy support and a broad market space.
In view of the emergence of urban construction waste, Henan Red Star, as the main crusher manufacturer, has developed a series of targeted equipment for the treatment of construction waste, such as the most convenient and efficient mobile crushing plant. In addition, through the classification of garbage, Drying, batching, drying through the dryer, and then broken into granules, can also be used in the manufacture of secondary concrete and building materials. Therefore, turning waste into treasure will inevitably become another investment boom of the society.