Elimination of Zinc from Roof Runoff through Geotextile and Clinoptilolite Filters

Abstract

a Geotextile and Clinoptilolite Filtersa Lehrstuhl für Wassergüte-und Direct infiltration of roof runoff into the ground may pose a potential risk of soil and groundAbfallwirtschaft, Technische water contamination. The performance of two different barrier materials for the retention Universität München, of zinc from roof runoff of an eleven year old zinc roof was examined in a field study. As Am Coulombwall, 85748 Garching, Germany barrier materials geotextile and clinoptilolite were applied. Automatic samplers were used to take samples both at the inlet and at the outlet of the retention facility. Samples of twenty rain events were examined. Zinc was detected in the roof runoff in concentrations of up to 25 mg/L, and lead which originates from the tin-solder was present in concentrations of up to 84 µg/L. Under most circumstances, a first flush could be observed for the analysed substances. No retention of heavy metals was observed, where only geotextile was used as a barrier material. The clinoptilolite filter was able to adsorb up to 97 % of zinc from the roof runoff. Elimination von Schadstoffen aus Abläufen eines Zinkdaches bei der Regenwasserversickerung

Roofing Materials Assessment: Investigation of Five Metals in Runoff from Roofing Materials

“…Dissolved metals predominate in the runoff from metal roofs. Authors reported between 96 and 99.9% of the zinc from zinc roof runoff was in the dissolved phase, Athanasiadis et al, 2004). On the other hand, Golding (2006) reported dissolved zinc represented between 70 and 100% of the zinc in the runoff from metal and PVC roofs.…”

Properties and applications of Zeolites

“…Both clinoptilolite and geotextile filters have been employed in attempts to intercept these toxic cations. While the geotextile filter is ineffective is retaining these heavy metal cations, perhaps not surprisingly, the clinoptilolite filter retained 97% of their initial concentration 185 . Naturally occurring Turkish zeolite minerals which contained 45% clinoptilolite and 35% mordenite were used to remove lead and zinc cations from their aqueous solutions 186 .…”

Copper and Zinc as Roofing Materials—A Review on the Occurrence and Mitigation Measures of Runoff Pollution

“…A possible cation exchange material is e.g., zeolite (see Table 4). The use of natural zeolites as cation exchangers for the treatment of metal roof runoff has been known since over a decade [91,92]. The ion exchange capacity of the zeolites can be enhanced through targeted pre-treatment [91,[102][103][104][105].…”