Life Cycle Environmental Assessment Of Rural Sewage In Suzhou Region

With the global warming and the worsening environmental pollution,the water environment treatment has been strengthened,Effective treatment of rural sewage has become one of the keys to improve water quality.With the development of the new rural construction in China,the government pays more attention to the treatment of rural sewage.Demonstration Projects of rural sewage set up in the serious water pollution and the key watershed for water pollution control in rural as the first priority.Then spread to the whole country.At present,there are many kinds of technology used in rural sewage treatment facilities.The main consideration of the construction is the treatment scale and treatment effect.There are few studies on the environmental impact of the whole life cycle of the facilities.Based on the framework of Life Cycle Assessment,this thesis determined the goal and scope of the rural sewage treatment facility.Its life cycle is divided into three parts: construction stage,operation stage and tearing down stage.And listed the analysis of life cycle inventory of the rural sewage treatment facilities.Through the investigation of two cities and two districts in Suzhou region,we identified MBR and SBR as the two typical technology of the rural sewage treatment for the LCA study.Based on the detailed analysis the cost and energy consumption of the two type treatment about its process,construction,operation,we listed the inventory.Then use Simapro7.1.8 to build model.Select CML2 baseline2000 as the impact assessment method.Do the environmental loading and benefit analysis of MBR and SBR sewage treatment in their life cycle.The study shows that the key factor of the environment impact of MBR and SBR facility is Marine aquatic eco toxicity in their whole life cycles.And the main building materials of the sewage treatment is the main contribution of the environment impact.Nowadays,the usual building materials used in rural sewage treatment are concrete,steel plate and GFRP.Compare analysis the life cycle environmental impact assessment of the sewage treatments build with the three type of building materials.We will find that the treatments build with steel plate or GFRP have less environmental impact than the concrete building.According to the results of this study,hope it has a certain reference for the building material selection of the rural sewage treatment in Suzhou.