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Vehicle Wash Wastewater Filtration

Introduction - Initial laboratory studies show X-TEX sorbent to be very efficient in selectively adsorbing / absorbing petroleum and vegetable-derived hydrocarbons from water. This work was done using laboratory prepared and controlled test solutions. This test demonstrates X-TEX’s sorbent effectiveness by testing real-world samples. Real-world samples measure not only the ability of the filter material to remove the pollutants of interest, but also to handle water that contains floating and dissolved hydrocarbons, emulsifiers and detergents, as well as debris that might affect filter performance.


Method -  The environmental manager of a local lumber mill provided a five gallon sample of effluent from a logging truck wash station. The sample was thoroughly mixed and split into two sub-samples. One sub-sample was tested to determine suspected organic and inorganic pollutants. The other sub-sample was passed through a filter system using X-TEX filter media and the filtered water was analyzed for the same pollutants. The analyses were performed by a fully accredited environmental laboratory using current U.S. EPA methods recommended for determining these compounds.


Results -  Truck Wash Effluent – Unfiltered / Filtered

Client ID
Method #
Parameter
Result for Unfiltered
Result X-TEX Filtered
Detection Limit
Units

Effluent 1/22/01

EPA 1664

Oil & Grease

>1000

6

5

ppm

Effluent 1/22/01

EPA160.2

Total Suspended Solids

230

10

5

ppm

Effluent 1/22/01

NWTPHDX

#2 Diesel Fuel

910

3.4

0.2

ppm

Effluent 1/22/01 NWTPHDX Motor Oil 15000 3 0.4 ppm
Effluent 1/22/01 EPA 6020 Arsenic ND* ND* 0.006 ppm
Effluent 1/22/01 EPA 6020 Cadmium 0.0018 ND* 0.0005 ppm
Effluent 1/22/01 EPA 6020 Chromium 0.013 0.0044 0.001 ppm
Effluent 1/22/01 EPA 6010 Copper 0.077 ND* 0.01 ppm
Effluent 1/22/01 EPA 6010 Lead 0.011 ND* 0.01 ppm
Effluent 1/22/01 EPA 6020 Nickel 0.0032 0.0082 0.001 ppm
Effluent 1/22/01 EPA 6010 Zinc 2.1 0.85 0.01 ppm
*ND– not detected at or above the method detection limit

Conclusions -  As can be seen in the table above, X-TEX sorbent was highly effective in removing organic pollutants and suspended solids from the sample. Especially notable is the reduction in oil and grease, diesel and motor oil between the filtered and unfiltered samples.


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