| In order to evaluate the advantages and disadvantages of different operation modes of large-scale biogas projects,taking a large-scale biogas project in Tangshan City as the research object,six different operation and treatment scenarios of biogas were set up with different biogas utilization and biogas residue and biogas liquid treatment methods;Quantitative analysis and evaluation of the economic and environmental impacts of the entire process of the six scenarios with cost-benefit analysis methods,and a comprehensive analysis of the calculation results,providing advice for the optimization of biogas fermentation systems and policy formulation for the resource utilization of agricultural wastes.For reference,the main findings are as follows: When considering the environmental cost,it is found that the environmental cost of the scenario S6 is the highest,which is 8.4376 million CNY.It is global warming,with a contribution rate of65.07%;the environmental cost of Scenario S3 is the lowest,which is 3.4368 million CNY,and the main source is environmental acidification,which is 27.13%.The economic feasibility of the six scenarios is evaluated through the cost-benefit analysis theory,and it is found Scenario S4 is the best economical,energy-saving and environmentally friendly biogas among the six scenarios Operation mode,the dynamic investment recovery period of this operation mode is 4.99 years,and the economic net present value of 30 years of operation is 219.6227 million CNY;its comprehensive environmental and economic benefits are lower than the cost,and the cost-effectiveness ratio is 2.65.Selecting the coupling system based on the waste heat of the steel plant and the anaerobic fermentation of livestock and poultry manure to process the livestock and poultry manure in Tangshan City can reduce the greenhouse gas emission reduction of61,240.2 tons equivalent,which has good environmental and economic benefits..Figure 32;Table 28;Reference 89... |
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