The levels of Zinc in stormwater runoff has been regulated and benchmarks have been set for the zinc levels allowed. Zinc can be produced from a wide range of areas including galvanized roofs and surfaces, motor oils, wear debris from tires, atmospheric deposition and fertilizers. There are a wide range of processes that are designed to remove Zinc from stormwater:

·        Adsorption  Adsorption is the most common and simplest process and is the adhesion of ions or molecules to the surface of the absorbent, with this layer then being removed through maintenance or filter replacement.

·        Chemical precipitation  The most common form of chemical precipitation to remove Zinc is through the use of insoluble hydroxide salt. The salt is formed by the adjustment of pH to roughly 10 level and this salt cause the Zinc to attached and create an insoluble substance that is considered a solid, allowing the simpler removal of the zinc. The system must be allowed to settle for the precipitation to occur making this process more difficult to occur.

·        Solvent extraction The use of solvent exchange to remove metals and water from industrial wastewater is a common process to achieve regulated Zinc levels.

·        Ion exchange  this process can be used to remove zinc from stormwater. Ion exchange systems can be designed to treat zinc by forcing the water through cation and anion resin beds along with activated carbon to produce deionized water. This process essentially causes an exchange of ions and causing the replacement of these ions with similarly charged ions of which are not considered pollutants in storm water. Since Zinc ions are positively charged, a cation exchange process is used to exchange the positively charged ion with that of what is available on the surface of the resin or the media. This process can also be known as water softening.

We have a range of teriary treatment systems that incorporate these chemical filtration processes. Our XTREAMPROTECTORENVIROPROTECTOR and MAXIPROTECTOR all incorporate a range of zeolite, activated carbons, AFM, perlite and various other filter media. Our BIOPROTECTOR utilises biofiltration to remove these products through microorganism biodegredation. We have all the solutions for your tertiary treatment needs.