Abstract
Excessive GHG emissions from human activities lead to climate warming, and sewage treatment plants are one of the sources of GHG emissions. The number of sewage treatment plants in my country is increasing year by year, and they emit a large amount of GHG, it is necessary to evaluate their emissions and seek ways to reduce emissions. According to the “Greenhouse Gas Inventory Protocol-Corporate Accounting and Reporting Standards”, taking a sewage treatment plant in a northern city as an example, the GHG emission classification of its operation control range, selection of evaluation methods and emission factors, assessment of GHG emissions, analysis of GHG emissions Constitution, propose ecological treatment technology, recycling CH4 and other emission reduction measures.
Highlights
The excessive emission of greenhouse gases such as CO2, CH4 and N2O into the atmosphere by human activities has led to environmental problems such as climate warming, this has led to international agreements and cooperation on GHG emission reductions, including the Kyoto Protocol
Many sewage treatment plants emit a large amount of GHG in operation, the carbon emission assessment of sewage treatment plants is relatively rare in my country and is still in the exploratory stage
Most studies believe that the carbon emissions of sewage treatment plants are divided into two parts: one is the direct emission of greenhouse gases such as CO2, CH4 and N2O in the process of sewage treatment; the other is the indirect emission caused by the energy and materials consumed in operation
Summary
The carbon emissions of sewage treatment plants are divided into three parts: direct emissions, indirect emissions, and other indirect emissions. The purchased electricity consumed by the operation of blowers, pumps, aerators and other equipment in the sewage treatment plant generates indirect emissions. Indirect GHG emissions from the purchased medicines, purchased raw materials, and fuel transportation consumed by the sewage treatment plant. According to the global warming potential (GWP), the potential value of CO2 is 1, and the potential values of CH4 and N2O are 23 and 296 respectively [5], CH4 and N2O can be converted into carbon emission equivalent according to the corresponding potential values
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