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Mesocosm Experiments at a Tunnelling Construction Site for Assessing Re-Use of Spoil Material as a By-Product
Water ( IF 3.0 ) Pub Date : 2021-01-12 , DOI: 10.3390/w13020161
Anna Barra Caracciolo , Paola Grenni , Livia Mariani , Jasmin Rauseo , Martina Di Lenola , Valerio Giorgio Muzzini , Enrica Donati , Ines Lacchetti , Paola Margherita Bianca Gucci , Antonio Finizio , Eleonora Beccaloni , Luisa Patrolecco

Mechanized excavation of tunnels with Earth Pressure Balance-Tunnel Boring Machines requires the use of foaming agents. The latter contain the anionic surfactant sodium lauryl ether sulphate (SLES) as the main compound. The re-use as a by-product of excavated soil containing foaming agents (spoil material) can pose a risk for soil and particularly for aquatic ecosystems if they are close to the spoil material final destination site. This work reports the chemical results (SLES residual concentrations) and ecotoxicological effects (battery of five tests) of 28 day-mesocosm studies performed at a tunnelling construction site. The soil mesocosms were set up with two different lithologies, which contained four different foaming agent products at the highest amounts used for excavation. The decrease in SLES concentrations and the ecotoxicological tests were performed in soil and its water extract (elutriate) at different times (0, 7, 14, 28 d). Elutriates were prepared in order to simulate a possible SLES leaching from soil to water. The results showed a decrease in SLES over time and different ecotoxicological responses depending not only on the initial amount of each product, but also on the soil lithology and organism tested (aquatic or terrestrial). This study showed how only site-specific ecotoxicological evaluations can ensure a safe management of the spoil material, making possible the re-use of soil and avoiding production of waste.

中文翻译:

在隧道施工现场进行中观试验,以评估废料作为副产品的再利用

使用土压力平衡隧道掘进机的隧道机械化开挖需要使用发泡剂。后者包含阴离子表面活性剂月桂基醚硫酸钠(SLES)作为主要化合物。如果挖出的含泡沫剂(土壤物质)的副产品再利用,可能会严重损害土壤,特别是对水生生态系统(如果它们靠近土壤物质的最终目的地)。这项工作报告了在一个隧道施工现场进行的28天的中观研究的化学结果(SLES残留浓度)和生态毒理效应(五个测试的电池)。用两种不同的岩性建立了土壤中观世界,其中包含四种用于挖掘的最高量的发泡剂产品。在不同时间(0、7、14、28 d)对土壤及其水提取物(淘洗液)进行SLES浓度降低和生态毒理学测试。制备洗脱液以模拟可能的SLES从土壤浸入水中。结果表明,随着时间的推移,SLES有所减少,并且不同的生态毒理响应不仅取决于每种产品的初始量,还取决于土壤的岩性和所测试的生物(水生或陆生的)。这项研究表明,只有针对特定地点的生态毒理学评估才能确保对弃土材料进行安全管理,从而可以重新利用土壤并避免产生废物。结果表明,随着时间的推移,SLES有所减少,并且不同的生态毒理响应不仅取决于每种产品的初始量,还取决于土壤的岩性和所测试的生物(水生或陆生的)。这项研究表明,只有针对特定地点的生态毒理学评估才能确保对弃土材料进行安全管理,从而可以重新利用土壤并避免产生废物。结果表明,随着时间的推移,SLES有所减少,并且不同的生态毒理响应不仅取决于每种产品的初始量,还取决于土壤的岩性和所测试的生物(水生或陆生的)。这项研究表明,只有针对特定地点的生态毒理学评估才能确保对弃土材料进行安全管理,从而可以重新利用土壤并避免产生废物。
更新日期:2021-01-12
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