Fitesa, a non-wovens manufacturer in the state of Washington consistently tests stormwater but experienced problems meeting the stormwater standards for zinc and copper discharge. Zinc is used in galvanized metal, shingles, finishes in paints, and car tires—zinc iseverywhere. Copper is used in items such as in brake linings and pressure treated lumber. At sites near heavily traveled roads, zinc, copper and lead get passed into the air and deposit on roofs and other surfaces. During the next rain event, pollutants that comprise the environmental deposition become a component of the site’s stormwater runoff. this study shows how MetalZorb from CleanWay Environmental Partners succeeded in helping this site achieve compliance with stringent regulations of the Washington State Department of Ecology (DOE).
- CleanWay Environmental Partners, Inc.
- Washington State DOE stormwater report - Case Study
Experimental study of hydraulics and sediment capture efficiency in catchbasins
Catchbasins (also known as gully pot in the UK and Australia) are used to receive surface runoff and drain the stormwater into storm sewers. The recent interest in catchbasins is to improve their effectiveness in removing sediments in stormwater. An experimental study was conducted to examine the hydraulic features and sediment capture efficiency in catchbasins, with and without a bottom sump. A sump basin is found to increase the sediment capture efficiency significantly. The effect of inlet control devices,...
Hirschthal, Switzerland protected with WaStop DN1200 - Case Study
Location: Hirschthal, Switzerland Problem: During times of high river levels, flooding occurred in the town of Hirschthal. This flooding occurred when the river level was higher than the stormwater outfall. This lead to river water pushing back up the outfall pipe, and spilling onto roads and residential areas. Solution: A DN1200 (NPS 48″) WaStop inline check valve was installed inside the stormwater outfall to allow stormwater to flow into the river but to prevent any backflow from flowing back up the...
Case study - Investigations of PAH pollution in stormwater stream TVARAN
Project referenceProject:Pilot project in Umeå city (Sweden)Customer:Umeå county, SwedenProject period2001-2002Nature of task: Determination of bioacumulative PAH pollution profile in Tvärån stormwater stream Evaluation of possible non-point sources SummaryIn this study the 16 EPA PAH compounds were studied. All three sampling sites show different pollution profiles related to the probable industrial and urban activities in the drainage regions. When the clean water upstream industrial...
Preliminary stabilisation of stormwater biofilters and loss of filter material
Stabilisation affects performance of stormwater biofilters operating under intermittent wetting and drying, mainly due to wash-off of filter material. Understanding the dynamics of solids wash-off is crucial in designing stormwater biofilters. The current study analysed the dynamics of solids wash-off in stormwater biofilters and quantified the loss of solids from the filter. Four Perspex™ bioretention columns (94 mm internal diameter) were fabricated with a filter layer that contained 8% organic material and...
Bioswales reduce contaminants associated with toxicity in urban stormwater
Contamination and toxicity associated with urban stormwater runoff are a growing concern because of the potential for receiving system impacts. California water regulators are mandating implementation of green infrastructure as part of new urban development projects to treat stormwater and increase infiltration. Parking lot bioswales are low impact development practices that promote filtering of runoff through plants and soil. Studies have demonstrated that bioswales reduce concentrations of suspended sediments,...