Improved Bioretention & Nitrogen Removal with Natural Zeolite
Soil amended with clinoptilolite zeolite is shown to increase the removal of nitrogen and other toxins from wastewater, while improving the water holding capacity and cation exchange capacity.

In most places water that enters a storm drain will go directly to a local body of water, it generally does not get treated at a wastewater plant. 

That means all those toxic pollutants that are swept away in rain and runoff could end up directly in our waterways. A solution that is becoming more and more prominent is green stormwater filtration infrastructure; called Biorentention cells.

There are many different forms of stormwater filtration designs, many use biology such as plants to absorb excess nitrogen and heavy metals. Most use different sand medias as well.  These are important elements of an urban environment because they help reduce the amount of toxic chemicals, road grime, and excess fertilizer that are washed into waterways. 

Researchers at the Department of Crop, Soil and Environmental Sciences at Auburn University in Alabama have studied the effects of adding natural clinoptilolite zeolite to these biorentention cells. 

By replacing a mere 10% of the sand with natural clinoptilolite zeolite the researchers saw a 15% increase in ammonia removal, and increased the saturated hydraulic conductivity by up to 55%. The overall cation exchange capacity, CEC, of the cell, was also improved. 

Bioremention cells containing as little as 10% zeolite were shown to remove 98% of the total zinc, 85% of the total copper, 96% of the total phosphorous, and 85% of the total ammonium.

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Removing Heavy Metal Contamination in Wastewater Using Clinoptilolite Zeolite
Research shows that natural zeolite can remove trace heavy metals from the wastewater of ink and pigment production, which can mitigate the toxic pollution into waterways.