| Along with our country sewage factory built in great quantities, the rapid development of the sewage treatment,Sludge treatment and disposal problems not properly resolved, the pollution of the environment problem increasingly prominent. Due to the rise of the construction of low carbon economy and society, sewage sludge with this kind of urban solid waste, its carbon emissions and the emission reduction potential will play an important influence. Therefore, understanding and reduce the sewage sludge disposal process of greenhouse gas emissions is necessary. Focus on sludge disposal process in greenhouse gas emissions is the meaning of, on the one hand, can be in sludge disposal process to reduce other pollutants due to the use of energy, on the other hand can be prompted for the development of new energy and clean energy. The third is to promote the world economy to a green economy and sustainable development of the economy in transition.Urban sewage sludge disposal process is a contains material change and energy conversion of the two aspects of the comprehensive process, it involves before disposal of thermal drying process, and later the mainstream disposal process. In the whole exist in the process of chemical kinetics, biochemical chemistry and thermodynamics wait for a phenomenon, will produce a series of greenhouse gas emissions, such as CO2and N2O and CH4. The process of selection and optimization of energy saving and emission reduction is the object of study of the basic characteristics. Establishment and traditional energy index similar indicators are structure sewage sludge disposal greenhouse gas emissions comparative analysis method system important steps.This article through to municipal sewage treatment after the sludge composition analysis and comparison of the municipal sludge must after thermal drying treatment, the sludge characteristics of a certain degree of change, to reduce the volume of sludge, eliminate the bacteria and the results of microbial eggs. Thermal drying after the sludge disposal methods according to different, greenhouse gas emissions result is endless also and same. Sewage sludge containing can level and the whole system of energy structure, research on greenhouse gas emissions is the most fundamental of the work.At the present time, sanitary landfills, incineration and composting were the main disposal methods of sewage sludge. The discharge amount of greenhouse gases exhausted during disposing process was calculated and analyzed with the method and default value recommended by the IPCC model. The emitting ways of involving greenhouse gases included direct discharge, indirect discharge and alternative emission. CH4was the gas considered during landfills process. And for the incineration and composting process, CO2and N2O are involved. The emission of CH4and N2O was converted to that of CO2.The net emissions of CO2during sanitary landfills, incineration and composting processed were695.847kgCO2/t、443.643kgCO2/t.511.817kgCO2/t, respectively. Organic fertilizer obtained from sewage sludge composting can be reutilized. Therefore, composting may be a promising technology for sewage sludge disposal in view of carbon emission reduction and resource utilization.On this basis, the research on the influence factors of sludge in greenhouse gas emissions and emissions for further analysis, put forward the corresponding countermeasures. At the same time, in hunan province as an example, the calculation of hunan urban sludge sludge with greenhouse gas emissions, based on greenhouse gas emissions scenarios at the same time, analysis of hunan province in2015,2020, the city sewage plant sludge and reductions of greenhouse gas emissions, to study and put forward hunan urban sewage plant sludge greenhouse gas disposal management policy Suggestions. |
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