Environmental impact assessment of a sewage treatment plant under different operating conditions
نویسندگان
چکیده
Environmental impact assessments of sewage treatment plants should consider not only emissions of greenhouse gases (GHG) from electricity use, but also N2O emissions generated by nitrogen removal processes, and the release of nitrogen nutrients into the water environment. Additionally, ecotoxicity of unionized ammonia is high, however no existing environmental impact assessment methodology addressed it. This study developed a methodology to evaluate the ecotoxicity of NH3 in the context of life cycle assessment. Nitrogen flow was measured in functioning sewage plants, allowing the environmental impact of changes in operating conditions, such as nitrificationinhibited or nitrification-promoted operation, to be compared. Result showed that in consideration of integrated environmental impacts, taking into account nitrogen emissions from discharge water and GHG emissions, nitrification-promoted operation is more preferable than nitrification-inhibited operation.
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