绿色矿冶

Taking a domestic sewage treatment plant in a county in Northwest China as the research object, the emission factor method was used to calculate the carbon emissions, and the main power consumption equipment of the sewage treatment plant was analyzed, and the carbon emission reduction effect of distributed photovoltaic was simulated. The results show that the carbon emissions of the sewage plant mainly include CH₄, N₂O and CO₂ produced by power consumption. In 2021, the proportion of N₂O emissions in the direct carbon emissions of the sewage plant was 49.3%, mainly from nitrogen nitrification and denitrification reactions, and the proportion of CH₄ emissions was 50.7%, mainly from the A2O sewage treatment process. The biochemical pool, the direct carbon emission equivalent of each quarter is different; the carbon emission generated by the power consumption of the equipment is 1697.38t, accounting for 99% of the total indirect carbon emission in the plant area. The total area of the plant that can be used to deploy distributed photovoltaic power generation equipment is 9479.96m². It is calculated that the average daily power generation can reach 6788.88kW·h, accounting for 85.5% of the total daily power consumption in the plant, and the carbon emissions that can be reduced account for 46.31% of the total carbon emissions. According to the calculation of investment cost, distributed photovoltaic can complete cost recovery in only 4.83 years, indicating that the distributed photovoltaic in sewage treatment plants can effectively reduce carbon emissions and has certain economic benefits in the long run.