What is a Junkyard?

A dump is a place where waste is dumped. The main purpose is to centralize the storage and disposal of garbage, and to reduce environmental pollution. ^[1]

The annual clearing and transportation volume of urban domestic garbage in China is about 140 million tons. Except for a small amount of incineration, composting or recycling, the remaining 70% is transported to landfills for disposal. During the storage, loading and unloading, tiling, and compaction of landfills, due to the decay and decomposition of organic matter in it, odor pollution will inevitably occur. Foul odor will seriously endanger human health and cause secondary pollution. If not properly handled, it will cause serious pollution to surrounding water bodies, the atmosphere and soil. Therefore, effective measures must be taken to prevent secondary pollution from landfills and reduce landfill sites. The impact on the surrounding environment and the sustainable development of population, resources, environment and society is an important issue currently facing. 2 Environmental impact issues and cause analysis

Microorganisms are one of the main bearers of the role of biotechnology. They use different degrading enzyme systems to convert a large amount of organic pollutants into inorganic substances that are beneficial to the reproduction of the ecosystem through degradation. The pollution caused by the destruction of the environmental balance caused by the poor enrichment of certain substances is dissipated and transformed, and the protection of the ecological environment is promoted.

The micro-ecological characteristics in the landfill environment are more complicated. The micro-ecological effect is the manifestation of degradation and transformation of various harmful substances accumulated in the background. It not only has a side that is beneficial to the protection of the ecological environment, but also the pollution of the ecological environment caused by the imbalance of the material cycle in the local ecosystem within a certain period of time.

(1) The total number of bacteria and E. coli are not only important indicators for evaluating the pollution of the environment by the garbage, but also one of the main indicative indicators reflecting the microbial activity in the garbage dump and the stage of transformation and degradation of the garbage:

(2) The action effect of various microorganisms and bacteria is one of the main biological effects of the pollutants being transformed and degraded in the landfill site, and provides a scientific basis for effective methods of controlling the pollution of the ecological environment by garbage.

(3) The dump is a serious source of pollution. It not only pollutes the surrounding soil environment, but also pollutes shallow groundwater or even deep groundwater.

(4) Under the good geological conditions of the garbage site (the thick clay barrier layer is as follows), the microorganisms and bacteria in the surface aeration zone have strong growth and reproduction. This zone is not only a base for the growth and reproduction of microorganisms, but also serves as an obstacle Natural barriers to control the transport and spread of pollution. In particular, the 2--2. 5 m can be used as a man-made use layer for blocking and controlling pollution, and can block pollutants. ^[2]

Strengthen the comparison and selection of site selection schemes

First, the comparison and selection of landfill site selection schemes should be strengthened, and the rationality of the site selection schemes should be demonstrated from the aspects of local planning, meteorological conditions, regional overview, especially hydrogeological conditions. Good hydrogeological conditions are the primary prerequisite for the site selection of the landfill. At the same time, the site selection must conform to local planning and take into account the effects of climatic conditions such as wind direction and rainfall.

Strengthen anti-seepage treatment

Many landfills in China use a mixed landfill method. Various types of waste are not classified and stacked together. Most of the landfills have only one layer of anti-seepage layer. The landfill uses high-density polyethylene geomembrane, and the impervious layer is artificially impervious. The impervious effect is obvious and practical. However, special attention should be paid to protecting the high-density polyethylene geomembrane during material transportation, engineering construction and landfilling to avoid pores and cracks and to ensure the anti-seepage effect. After the leachate is collected in the sump, it is periodically sprayed back to the garbage dump for natural evaporation consumption. This treatment method can not only suppress the dust, but also reduce the cost of leachate treatment. It is a common method for the treatment of leachate in northern areas. It has been proved to be a more feasible treatment method in practice.

Resource utilization of garbage

Carry out the resource utilization of garbage, and ensure that the garbage that can be recycled is effectively used as much as possible. In the case of resource shortage and increasing pressure, the resource utilization of garbage should be gradually realized and re-entered into the recycling system. In short, realizing the resource utilization of waste can not only reduce the pressure on China's waste landfill disposal system, but also the future development direction of waste treatment in a recycling-oriented society. ^[1]

In order to strengthen the management and supervision of garbage dumps, clarify management responsibilities, and ensure the safe and normal operation of garbage dumps, this system is specially formulated.

1. Do a good job of fire prevention, prohibit the entry of idle and miscellaneous personnel, and it is strictly forbidden to bring fire to the site. 2. Do a good job in anti-theft work to ensure the safety of the gates, monitoring facilities, fence nets, and notice boards on the side of the field.

3, the grass grows well, no obvious weeds, and timely pruning.

4. Non-landfill areas in the fence net, regularly clean weeds, miscellaneous trees, and vines. 5. Kill ant packs, mosquitoes, flies, and rats in the field in a timely manner. Routine killing is routinely performed every half a month.

6. Ensure that all rainwater ditches in the dump are unobstructed, check regularly, and clear up if there is a blockage in an emergency. 7. The gate should be closed and locked in time when entering or leaving the dump.

8. It is strictly forbidden to dump garbage in an orderly manner.

9. Regularly check whether all relevant facilities in the site, such as gates, monitoring facilities, flood drainage ditches, notice boards, etc. are intact, and repair them in a timely manner if damaged. If outsiders intentionally damage or steal, stop or report to the supervisor in time.

10. Keep the environment of the landfill site clean and hygienic, and the living area clean and beautiful. 11. Maintenance, repair, renovation and replacement of equipment and facilities.

11. Maintenance, repair, renovation and replacement of equipment and facilities.

12. Daily inspections of garbage dumps, establishment of a handover system, without management gaps, strictly in accordance with the requirements of higher authorities, supervision, guidance, inspection and acceptance.