污水处理厂生命周期评价及不同工艺污水处理系统的环境影响比较分析

对某A2／O工艺城市污水处理厂施工建造和运营维护阶段所造成的环境影响进行生命周期评价，并以绿色税收为参考指标概算各环境影响指标造成的经济负担，同时对采用不同污水处理方式的污水处理厂的生命周期评价结果进行比较。结果表明：A2／O工艺城市污水处理厂生命周期内造成的环境影响主要来自运营维护阶段的能量消耗，对水体富营养化的影响较大；相对于某湿地污水处理系统，A2／O工艺城市污水处理厂对非生物资源消耗较大，但在大气酸化、光化学氧化以及全球变暖等方面的影响较小；相对于五阶段Bardenpho工艺，A2／O工艺对水体富营养化具有较大影响，但在非生物资源消耗、全球变暖、光化学氧化、大气酸化等方面影响较小。

Life cycle assessment of a wastewater treatment plant and comparison analysis of environmental impacts of different wastewater treatment systems

A life cycle assessment was conducted to study the environmental impacts of a wastewater treatment plant during its construction and operation using the A2/O process. The environmental impacts in terms of green taxes were represented to estimate their economic burden. Life cycle assessment results of different wastewater treatment plants using different wastewater treatment processes were compared. It was shown that the electricity consumption during the operation stage contributed most to the environmental impacts of the wastewater treatment plant, and that the plant had a great impact on eutrophication of water bodies. Compared with the wastewater treatment system of a wetland, the wastewater treatment plant using the A2/O process showed greater depletion of abiotic resources, but less impact on acidification, photochemical oxidation, and global warming. In comparison with the five-stage Bardenpho process, the A2/O process had a greater impact on eutrophication of water bodies, but less impact on abiotic resources depletion, global warming, photochemical oxidation, and acidification.