Urban waste disposal technology

Summary and analysis of urban waste disposal methods and problems, make the Technology suitable for China's urban waste disposal, in order to achieve waste "Reduce, reuse, recycling," the sound processing.

Keywords municipal solid waste; treatment; issues; Technology

"Junk Besieged City" is an indisputable fact that waste disposal has become a headache for city managers around the problem. Will waste energy and resources as available, starting from the eco-Industry as a whole, through the information flow, energy flow, material flow integration, the waste disposal system into the ecological cycle. The Government introduced the policy support, social forces to participate in Research and development and full active support enterprises to actively invest in the development of modern science and Technology depend on the level of waste as raw material resources will be added to the formation of waste disposal and recycling a more complete system [1-2]. China has its special waste, the Chinese family as a unit of city life cooking their own meals, family kitchen is the main output of waste source, and there has been no strict classification of garbage collection. So , municipal waste are complicated, large organic matter content, low calorific value, waste volume. In order to better utilize and handle municipal waste, the author introduces and analyzes the current use of waste residue method, and proposed treatment, and appropriate for China effective way of waste disposal.

1, the main waste disposal Technology
1.1 can scale biomass waste collected
Including catering and canteens catering swill, farmers market fruits and vegetables scraps, animal slaughter and food processing waste, livestock insurance system be turned over to the death of livestock during the implementation, for the removal of invasive plants (such as Spartina anglica , water lettuce, etc.) produced fodder, etc. [3-5]. this kind of rubbish a large water content, nutrient-rich, highly degenerate, can transmit viruses, there is risk of spread of infection source. At present approach: First, dry and directly as animal feed, which exists from the food chain risk of disease transmission should be prohibited; second fermentation for organic fertilizer or biogas use for a complete sterilization, the high cost is a loss-making business, to be heavily subsidized business in order to survive.

Recommendations: the microbial biomass waste into pesticide production medium, even if garbage was completely harmless, but also production of microbial pesticides, making substantial profits.

1.2 burnable garbage
Refuse collected from residents of the community is basically kitchen waste, packaging and discarded household items. Currently, the community has given people refuse collection point, as long as the issuing system, the initial points can not be burned except construction waste and other garbage can, as the majority of the remaining materials for the burnable garbage. Incineration is the international means of disposing of waste reduction, incineration has advanced machinery; also smoke a mature approach. major use of "wet lime Adsorption - Adsorption - bag dust", the discharge gas European standards can be achieved [6-8].

Question: This is an ongoing cost-consuming process, and the incremental emission reductions associated with the investment; the Chinese waste incineration financial subsidies when the use of quantitative models. Operators in order to make a profit at cutting corners, artificially causing excessive emissions. Therefore, incineration plant built the place, the inevitable pollution.

Recommendations: First, a new flue gas treatment model. "Wet lime adsorption - the degradation of plasma - dust curtain Nano Carbon Fiber - Titanium Dioxide Photocatalyst Degradation of quartz sand." This is not only a technical upgrade, you can more thoroughly elimination of dust pollutants, including dioxins in, and the processing cost. Second is the use of cogeneration Technology and nano calcium carbonate. the wet lime can be used calcium carbonate by-product of the production process, while the flue gas after purification and as CO2 source for calcium carbonate production. Through this mutual-type business model, the production of nano calcium carbonate purifying smoke into the necessary production processes, companies must "consciously" deal with smoke.

Links to Research Papers Download http://www.hi138.com 1.3 to landfill
Municipal solid waste landfill disposal is the most basic approach. It is the waste buried in the ground, through the microbial decomposition of long-term, so that break down into harmless compounds. Modern large-scale waste landfill landfill more than a unit [9], on the landfill of waste compaction and daily cover layer by layer methods to improve efficiency.

Questions: First, landfill gas generated hazards, landfill waste decomposition by aerobic and anaerobic microbial decomposition of landfill gas will produce a large number of its components are CH4, CO2, NH3, H2S, etc., in which CH4, CO2 accounts for majority. When the methane concentration of 5% to 15% in the explosion may occur under aerobic conditions; CO soluble in water, not only will lead to ground water pH values decrease, but will also increase water hardness and minerals; In addition, plant roots due to the accumulation of CO2 and methane effects, due to lack of oxygen jeopardizing their growth. The second is caused by infiltration of liquid secondary pollution. waste by microbial decomposition and the influence of surface water will produce a certain amount of infiltration of fluid. It is a high concentration organic wastewater, penetrate the surrounding ground, causing pollution of drinking water.

Recommendations: First, through leachate recirculation technology to accelerate decomposition of organic matter. By collecting methane gas as fuel collection network, and through the spray disinfectant and mixing sound landfill generated during the production of nano calcium carbonate lime sludge deodorization disinfection methods. Second, cover the top of the soil in the landfill material, planting aromatic plants constitute the aroma park, both to improve the environment, but also to obtain ecological advantage.

2 Conclusion
Municipal waste are complicated, and subject to the level of economic development, energy mix, natural conditions and traditional habits and other factors, is difficult to have uniform treatment mode. Of urban waste disposal generally vary with the circumstances, regardless of which approach , but in the end are all harmless, resource and reduction objectives into the deal. of municipal refuse a late start, now is not suitable for the majority of our municipal waste incineration for power generation, while the landfill but also by the limited land resources, the use of cost-efficient cogeneration technology and nano calcium carbonate treatment of municipal waste is an effective method worthy of application. the direct use of heat as a microbial pesticide and nano calcium carbonate production of heat and cold source (through the absorption refrigeration system conversion). taking into account the energy balance, the remaining heat for ice making, production of fresh bacteria "super ice", can be widely used in fish preservation of the Health sector with ice. in order to achieve full utilization of high-value garbage harmless treatment, not only to reduce City municipal burden, but also create wealth for society, this approach can be realized spam, "Reduce, reuse, recycling," the sound processing.


3 References
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