Department of Applied Science and Technology (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino (TO), Italy.
Department of Applied Science and Technology (DISAT), Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino (TO), Italy.
Chemosphere. 2022 Feb;289:133058. doi: 10.1016/j.chemosphere.2021.133058. Epub 2021 Nov 25.
The aim of this study is the evaluation of the environmental sustainability by means of Life Cycle Assessment (LCA) and economic profitability through Life Cycle Costing (LCC) of the 18 anaerobic digestion (AD) configurations carried out on Organic Fraction Municipal Solid Waste (OFMSW) at three Substrate Inoculum (S:I) ratios (1:2, 1:1 and 2:1) for three different inoculum incubation times (0, 5 and 10 d). The adopted approach was the eco-efficiency perspective, coming from the combination of technical, environmental (LCA) and economic (LCC) perspectives. The main findings of the study were that increasing both the S:I ratio and the inoculum incubation time (5 and 10 d) the environmental impacts decreased, and economic profitability increased. The lowest values of Climate Change were achieved by the AD performed with both inocula WAS and CAS for 10 d at S:I equal to 2:1: 28.67 and 27.72 kg CO eq respectively. The minimum AD plant size for which all the 18 AD configurations was economically profitable after 5 y of amortization was 30,000 t/y of OFMSW. Capital and operational costs decreased by increasing the incubation time of the inoculum and the S:I ratio, since higher specific biogas rate was reached, and smaller AD bio-reactor volume were adopted because hydraulic retention time decreased. The AD plant size, for which maximal revenues and minimal capital and operational costs were detected, was 50,000 t/y OFMSW. Among all the AD configurations, the environmental sustainability and economic profitability were reached by test perfomed with inocula WAS and CAS incubated for 5 and 10 d at the highest S:I ratio 2:1.
本研究旨在通过生命周期评估 (LCA) 评估环境可持续性，并通过生命周期成本核算 (LCC) 评估 18 种在有机废物固形物 (OFMSW) 上进行的厌氧消化 (AD) 配置的经济盈利能力，S:I 比分别为 1:2、1:1 和 2:1，接种物的三个不同孵育时间 (0、5 和 10 d)。所采用的方法是生态效率视角，来自技术、环境 (LCA) 和经济 (LCC) 视角的结合。该研究的主要发现是，增加 S:I 比和接种物孵育时间（5 和 10 d）都可以降低环境影响，提高经济效益。在 S:I 比为 2:1 时，接种物 WAS 和 CAS 孵育 10 d 后，气候变化的最低值分别为 28.67 和 27.72 kg CO eq。在 5 年摊销后，所有 18 种 AD 配置均具有经济盈利性的最小 AD 工厂规模为 30000 t/y OFMSW。随着接种物孵育时间和 S:I 比的增加，资本和运营成本降低，因为达到了更高的特定沼气产率，并且由于水力停留时间缩短，采用了更小的 AD 生物反应器体积。AD 工厂规模为 50000 t/y OFMSW，可实现最大收益和最小资本及运营成本。在所有 AD 配置中，通过在最高 S:I 比为 2:1 的情况下，对接种物 WAS 和 CAS 孵育 5 和 10 d 进行的测试，达到了环境可持续性和经济盈利能力。
