CONTAMINANT-REACTIVE GEOCOMPOSITE MAT AND METHOD OF MANUFACTURE AND USE

摘要

Reactive geocomposite mats, and their method of manufacture, for treating contaminants in sediment, soil or water that allow the passage of essential ly non-contaminated water therethrough. The geocomposite mat includes a pre- formed woven or non-woven geotextile, that is needlepunched to an outer geot extile sheet layer to provide a high loft, structurally secured, pre-formed geotextile having a thickness of about 6 mm to about 200 mm, and having, a p orosity sufficient to receive a powdered or granular contaminant-reactive ma terial, contaminant-sorptive material, or a contaminant-neutralizing materia l (hereinafter collectively referred to as "contaminant-reactant material" o r "contaminant-reactive material") throughout its thickness, or in any porti on of the thickness across its entire major surface(s). The powdered or gran ular contaminant-reactive material is disposed within the pores of the previ ously formed, high loft geotextile mat to surround the fibers, e.g., by vacu um or vibrating the high loft mat while in contact with the contaminant-reac tive material to allow the powdered or granular contaminant-reactive materia l to flow by gravity into the pores of the previously formed, needlepunched geotextile. A liquid-permeable outer geotextile sheet then is secured to the filled geotextile, preferably by heating upwardly extending fibers of the p re-formed geotextile mat to prevent the powdered or granular material from e scaping from the geotextile during transportation and installation.