Urgent: garbage treatment plant internship log (not afraid of word more)

I, understanding the purpose of the internship through the waste treatment plant understanding of the internship, to understand the process of waste treatment machines and corresponding facilities, to understand the nature and characteristics of the environmental science professions, is conducive to the students of the subsequent professional courses of study Second, Zhengzhou waste treatment plant is located in Zhengzhou comprehensive waste treatment plant in Erqi District, Houzhai Township, from the southwest bypass highway 800 meters, the plant covers an area of about 1,280 acres. The entire plant is divided into waste treatment sewage purification, manure treatment of three major parts. A project includes sanitary landfill, sewage treatment station, manure harmless treatment plant and management office area, the second phase will be built on the very high temperature. Waste treatment process to sanitary landfill as the main, high temperature composting as a supplement, the design service life of 22 years, biochemical waste treatment scale of 2300 tons per day. Sanitary landfill total volume of 13 million cubic meters together with A-D to your brother to go volume of 60,000 cubic meters. According to the current 2500 tons per day sand monk or garbage production, A-D two areas need about seven or eight years to fill up. Third, the composition and characteristics of China's solid waste human beings in the development of resources and manufacturing products in the process, is bound to produce waste after consumption and use, will become waste. The solid and semi-solid materials with no use value generated by the process of all human activities are called solid waste. China's garbage is mainly industrial waste generated by industrial processes, agricultural waste, mining waste, municipal waste. Municipal waste comes mainly from residential consumption, municipal construction and maintenance, and commercial activities. Municipal waste accounts for the vast majority of the total waste generated. The composition of municipal waste is mainly related to the economic level of the city, and the proportion of organic waste in the composition of China's municipal waste is generally not high, with low calorific value and high water content. Not conducive to resource utilization, so most of China's urban waste disposal are sanitary landfill. Fourth, the advantages and disadvantages of landfill due to sanitary landfill due to mature technology, low treatment costs and other advantages, is currently China's municipal waste centralized disposal of the main way. The sanitary landfill of garbage has slightly less investment, simple process, large treatment capacity, and better realization of the harmlessness of the surface. At the same time, the landfill garbage is not harmless treatment, residual large number of bacteria, viruses; also lurks in the methane gas heavy metal pollution and other hidden dangers; its garbage seepage liquid will also be a long time to contaminate the groundwater resources, so this method has the potential to be very harmful, will bring infinite trouble to future generations. This method not only fails to realize the resource treatment of garbage, but also occupies a large amount of land, which is a dangerous practice to leave the pollution source to future generations. At present, many developed countries explicitly prohibit landfills. Authorities at all levels of our government have gradually come to realize the problems of this treatment technology and are bound to prohibit and eliminate this kind of behavior. Fifth, the landfill process may produce pollution and preventive measures 1, garbage leachate pollution garbage in the process of long-term landfill piling anaerobic fermentation, will produce leachate. Domestic garbage leachate is a kind of high concentration wastewater containing many kinds of pollutants, which contains difficult to degrade organic matter and metal ions exist for a long time, wide range, great harm, can not be directly discharged, thus leachate treatment is particularly important. Landfill seepage control measures there are a variety of general can be divided into natural seepage control and artificial seepage control, but regardless of the type of seepage control to meet the seepage control rate and compressive strength requirements, that is, the horizontal and vertical to your brother's direction of the seepage control rate of not more than 1.0 * 10-7cm / s, the compressive strength must be greater than 0.6MPa. Natural seepage control refers to the use of natural sites of the soil hydrological and geotechnical conditions of the work of seepage control The natural seepage control is to ensure that the leachate does not leak into the foundation, or to control the leachate to a minimum, so as to achieve the purpose of reducing pollution. Artificial seepage control can be divided into vertical seepage control, horizontal seepage control and top surface seepage control. According to the design, the comprehensive waste treatment plant has three sets of systems to prevent pollution: one is the sanitary landfill seepage control system, the bottom, side walls, there are tight seepage control measures, will not pollute the groundwater; but the sewage treatment system, garbage leachate by the sewage treatment station treatment can reach the national agricultural irrigation water quality standards of the second category; thirty methane gas inverted system, from the bottom of the depth of the sanitary landfill to the gas pipe discharge of methane gas. Zhengzhou Comprehensive Waste Treatment Plant leachate used in the depth of the disposal project, that is, the use of anaerobic (UBF) + FEO reactor + oxidation ditch + membrane biological treatment A/O / MBR + ultrafiltration + nano-filtration / reverse osmosis process, sewage treatment project emission standards are, the implementation of "comprehensive sewage discharge standards" (GB8978-1996) in the first-class emission standards, can be directly discharged into the reservoir, or used in the Agricultural irrigation. 2, landfill pollution of the atmosphere landfill due to fermentation in the landfill process, the air quality near the landfill is not good, there are a large number of gases with irritation emanating from the landfill, there are anaerobic fermentation of methane gas, carbon dioxide, ammonia and other exhaust gases generated by the water treatment process. Most of these gases are greenhouse gases, and when discharged directly into the atmosphere, they increase the amount of greenhouse gases in the atmosphere, creating a greenhouse effect. The landfill process generates a large number of bacteria and breeds mosquitoes and flies, polluting the local and nearby air. Waste treatment plants are introducing advanced technology, and the use of biogas companies, *** with the landfill process of waste gas such as methane gas for the use of resources.3, landfill land encroachment in our country such a large country of population, the population density is also very large, the process of sanitary landfill of garbage, there is no doubt that large-scale land occupation, which is the garbage in the fight with the people for the scarcity of land resources. Only the appropriate solution to waste disposal can reduce the waste of land resources, in order to alleviate the disposal of garbage and people's demand for land to form a sharp contradiction. At present, the feasible way is to classify garbage from the source of garbage generation, so as to reduce the amount of garbage and reduce the area of land occupied. It can alleviate the sharp contradiction between garbage and people's demand for land. V. Concept of garbage disposal methods 1, the implementation of garbage classification system garbage classification is the first step to reduce the amount of domestic garbage, different types of garbage for different disposal, learn more about the garbage disposal methods of advanced cities at home and abroad, the implementation of fetishism, the garbage for the chemical, quantitative, harmful disposal. Form a garbage industry chain, make a garbage economy, and *** build an environmentally friendly and harmonious society. For example, we can learn from the experience of Nagoya, according to the composition of domestic garbage, it can be roughly divided into four categories: ① recyclable non-living garbage, such as paper products, plastic products, metal products, glass products, etc.; ② food waste, such as leftovers, egg shells and fruit peels, vegetables, vegetables and leaves of a kind of kitchen waste; ③ other garbage, such as masonry and ceramics, sanitary wastepaper, ash, fabrics, etc.; ④ toxic and hazardous garbage, such as waste batteries, fluorescent tubes, lamps and tubes, and so on, and so on. Such as waste batteries, fluorescent tubes, bottles and cans containing toxic substances, etc. 2, actively develop composting technology Composting is the treatment technology for organic components in garbage. After composting, domestic garbage can become compound fertilizer for crops. At present, the organic content of domestic garbage is relatively high, composting after the collection of domestic garbage classification, has a broad development prospect.3, appropriate use of incineration Due to the expensive garbage incineration equipment, in Shiyan City, the use of incineration is difficult, but can consider the simple incineration method, the equipment is simple, the investment is relatively small, easy to operate, the requirements of the treatment site is not high, it is more suitable. After the introduction of simple incineration method for the recovery of heat energy for heating, thereby reducing soot pollution of the environment. Sixth, the understanding of the internship experience through this to Zhengzhou City, comprehensive garbage treatment plant understanding of the internship, to understand the current situation of garbage disposal in most parts of China and the future direction of the development of garbage disposal methods. This understanding of the composition of the landfill, as well as the landfill treatment of garbage process, especially for the leachate treatment process, there has been a very full perceptual understanding. Will have a clearer goal and motivation for the next step of the study.