Coupling phytoremediation of Pb-contaminated soil and biomass energy production: A comparative Life Cycle Assessment
Coupling phytoremediation of Pb-contaminated soil and biomass energy production: A comparative Life Cycle Assessment
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DOI：
10.1016/j.scitotenv.2022.156675
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发表时间：
2022-09-20
影响因子：
9.8
通讯作者：
Bautista, Luis Fernando
中科院分区：
文献类型：
--
作者：
Espada, Juan J.;Rodriguez, Rosalia;Bautista, Luis Fernando
植物修复是一种基于植物对土壤污染物的固定能力的原位修复技术。从这个意义上说，高羊茅等植物是一种很有前途的去除重金属污染土壤。本工作研究了植物修复铅污染的土壤位于西班牙使用F。生命周期评价（LCA）方法。评估了两种不同的生物质管理办法：在安全填埋场直接处置（情况1A）和能源回收（情况1B）。对于后一种选择，使用SuperPro Designer 9.5模拟热电联产。此外，传统的处理，如土壤冲洗（情况2）和挖掘+填埋（情况3）的环境影响进行了评价的LCA。前者使用SuperPro Designer 9.5进行模拟，而后者使用文献中的数据进行LCA。结果表明，在案例1A中，填埋场中的生物质处置是对总体影响最重要的贡献者。相比之下，生物质调节和热电联产是情况1B中造成环境影响的主要步骤。比较案例1A和1B，从生物质中回收能量上级直接填埋处理，减少了大多数研究类别的环境影响。至于其余的治疗，化学品生产和土壤处置的情况2和3，分别提出了最关键的环境负担。最后，研究案例之间的比较表明，植物提取+能量回收是研究条件下最环保的选择，可将影响减少30- 100%。
Phytoremediation is an in-situ remediation technology based on the ability of plants to fix pollutants from the soil. In this sense, plants such as Festuca arundinacea are a promising for heavy metal removal in contaminated soils. The present work studies phytoremediation for Pb removal from a contaminated soil located in Spain using F. arundinacea by applying the Life Cycle Assessment (LCA) approach. Two different options for biomass management were assessed: direct disposal in a security landfill (case 1A) and energy recovery (case 1B). For the latter option, cogeneration was simulated using SuperPro Designer 9.5. In addition, traditional treatments such as soil washing (case 2) and excavation + landfill (case 3) were evaluated in terms of environmental impacts by LCA. The former was simulated using SuperPro Designer 9.5, whereas data from literature were used for the latter to perform the LCA. Results showed that biomass disposal in a landfill was the most important contributor to the overall impact in case 1A. In contrast, biomass conditioning and cogeneration were the main steps responsible for environmental impacts in case 1B. Comparing cases 1A and 1B, the energy recovery from biomass was superior to direct landfill disposal, reducing the environmental impacts in most of the studied categories. Regarding the rest of the treatments, chemical production and soil disposal presented the most critical environmental burdens in cases 2 and 3, respectively. Finally, the comparison between the studied cases revealed that phytoextraction + energy recovery was the most environmentally friendly option for the studied conditions, reducing impacts by 30-100%.