Abbar Bouamama, Alem Abdellah, Pantet Anne, Marcotte Stéphane, Ahfir Nasre-Dine, Duriatti Davy
a Normandie Univ, UNIHAVRE , Le Havre , France.
b Normandie Univ, INSA Rouen , Saint Etienne du Rouvray , France.
Environ Technol. 2017 Dec;38(23):2964-2978. doi: 10.1080/09593330.2017.1284270. Epub 2017 Feb 5.
Natural geotextiles are increasingly used in geotechnical applications such as bank protection and short-term soil reinforcement. This study aimed to highlight the behaviour of natural flax fibre geotextiles towards the retention of suspended particles (SP) present in urban runoff and often polluted. Indeed, it is well known that a large fraction of the heavy metals are often associated with the SP. Long-term filtration tests were performed on four laboratory filter designs. The objective was to study the influence of a nonwoven flax fibre geotextiles on SP transfer through a sandy porous media under saturated conditions. The experiments consisted of injecting SP in a column filled with sand with and without flax fibre geotextiles at a constant flow rate. The results showed that nonwoven flax fibre geotextiles can increase flow homogeneity. Retention efficiency of SP at column scale as well as spatial deposition profile was modified by the presence of geotextile. The use of flax fibre geotextiles increases considerably the durability of the filtration system. Particle size analysis of the particles retained in the sand medium and in geotextiles shows that the coarser particles are mainly deposited at the entrance of the column, and in the geotextiles.
天然土工织物越来越多地用于岩土工程应用，如河岸防护和短期土壤加固。本研究旨在突出天然亚麻纤维土工织物对城市径流中存在的且通常受到污染的悬浮颗粒（SP）的截留性能。事实上，众所周知，很大一部分重金属通常与悬浮颗粒有关。对四种实验室过滤器设计进行了长期过滤试验。目的是研究非织造亚麻纤维土工织物在饱和条件下对通过砂质多孔介质的悬浮颗粒迁移的影响。实验包括以恒定流速在装有砂且有或没有亚麻纤维土工织物的柱体中注入悬浮颗粒。结果表明，非织造亚麻纤维土工织物可提高水流均匀性。柱体尺度下悬浮颗粒的截留效率以及空间沉积剖面因土工织物的存在而改变。亚麻纤维土工织物的使用显著提高了过滤系统的耐久性。对砂介质和土工织物中截留颗粒的粒度分析表明，较粗颗粒主要沉积在柱体入口处和土工织物中。
