School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NWS 2007, Australia.
School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NWS 2007, Australia; NTT Institute of Hi-Technology, Nguyen Tat Thanh University, Ho Chi Minh City, Viet Nam.
Sci Total Environ. 2021 Aug 25;784:147135. doi: 10.1016/j.scitotenv.2021.147135. Epub 2021 Apr 16.
This study investigated the environmental burdens concerning the recycling/recovery process of a wastewater treatment plant's construction material waste and biogas. Detailed data inventories of case studies were employed in several scenarios to explore the role of end-of-life treatment methods. The ReCiPe 2016 and the Greenhouse gas Protocol life cycle impact methods were conducted to measure the impact categories. The construction and demolition phases were considered for recycling potential assessment, while the operational phase was examined for assessing the advantages of energy recovery. Metal and concrete recycling show environmental benefits. Increasing the reprocessing rate requires more water consumption but results in: firstly, a decrease of 18.8% in total damage; secondly, reduces problematic mineral scarcity by 3.9%; and thirdly, a shortfall in fossil fuels amounting to 11.6%. Recycling concrete helps to reduce the amount of GHG emissions 1.4-fold. Different biogas treatment methods contribute to various outcomes. Biogas utilization for on-site energy purposes has more advantages than flaring and offsite consumption. Electricity and heat generation originating from biogas can provide 70% of the energy requirement and replace 100% natural gas usage. Biomethane production from biogas requires extreme power and more resources. Meanwhile, producing heat and electricity can offset 102.9 g of fossil CO, and manufacturing biomethane contributes the equivalent of 101.2 g of fossil fuel-derived CO. Reducing 10% of recovered electricity creation could rise 19.19% global warming indicator of the wastewater treatment plant.
本研究调查了污水处理厂建筑材料废物和沼气回收/再利用过程中的环境负担。在几个场景中使用详细的案例研究数据清单来探索寿命终结处理方法的作用。采用 ReCiPe 2016 和温室气体协议生命周期影响方法来衡量影响类别。考虑了施工和拆除阶段的回收潜力评估，而运营阶段则评估了能源回收的优势。金属和混凝土回收显示出环境效益。提高再加工率需要更多的水消耗，但会导致：首先，总损害减少 18.8%；其次，减少 3.9%的问题矿物短缺；第三，减少 11.6%的化石燃料短缺。回收混凝土有助于将温室气体排放量减少 1.4 倍。不同的沼气处理方法会产生不同的结果。沼气用于现场能源的利用比燃烧和场外消耗具有更多优势。沼气产生的电力和热能可以提供 70%的能源需求，并取代 100%的天然气使用。沼气生产生物甲烷需要极端的电力和更多的资源。同时，生产热能和电力可以抵消 102.9 克化石 CO，而制造生物甲烷相当于 101.2 克化石燃料衍生的 CO。减少 10%的回收电力产生可能会使污水处理厂的全球变暖指标上升 19.19%。
