Zinc and copper removal from industrial stormwater depends on treating the dissolved fraction. See where the metals originate and which Abtech format fits each discharge point.
Zinc and copper removal from industrial stormwater works when the treatment step targets the dissolved metals, because settling and screening only catch the particle-bound share. Smart Sponge® HM media binds dissolved zinc and copper as runoff passes through it, and we supply it in formats matched to each discharge point on your site.
Why Do Zinc and Copper Still Exceed Benchmarks After Sediment Controls?
Sumps, hydrodynamic separators and standard filter fabric are built to hold back particles. Metal that is already dissolved in runoff has nothing to strain out, so it moves through those devices and appears in the lab result. That is how a yard can look clean on a visual inspection and still exceed an NPDES or MSGP benchmark. A repeat exceedance usually triggers a documented corrective action under your SWPPP, and adding more solids control rarely changes the dissolved result. For a deeper read on lab fractions, see our post on dissolved versus total metals in stormwater.
Where Do Zinc and Copper in Industrial Runoff Come From?
Galvanized roofing and rooftop equipment are a leading source of zinc. A rooftop-filter manufacturer's press release on rooftop zinc and copper runoff reports that conventional zinc-coated steel roofs release between 1.0 to 3.0 mg/L of zinc, which it puts at 10 to 30 times typical benchmark values. Those are the release's figures for roofs, not a measurement of any Abtech site, so your own sampling decides what applies to you.
The source also lasts. The Galvanizers Association's page on zinc and stormwater runoff notes that zinc can be carried from galvanized structures to surface waters over the entire lifetime of the structure. A one-time cleanup will not end the release, which is why a passive treatment step at the discharge point makes sense for chronic zinc.
Copper more often comes from roofing, gutters, plumbing and brake-related debris, and on recycling or fabrication sites from stockpiled scrap and uncovered process areas. Our guide to what causes heavy metals in stormwater breaks the sources down by site type, and our metal recycling facility stormwater treatment post covers that sector at the catch basin.
How Does Smart Sponge® HM Treat Dissolved Zinc and Copper?
Smart Sponge® HM is the media in our family built for dissolved metals, including lead, zinc, copper, arsenic and selenium, along with phosphorus. Standard Smart Sponge® media targets hydrocarbons and oil, so a site with both a metals problem and an oil sheen can combine media types in one system instead of running separate treatment trains. We keep media and format separate on purpose: HM is what treats, and the insert, vessel or outfall unit is what holds it. We do not promise a removal rate or guaranteed compliance, because results depend on the water and the design.
Which Format Fits Which Discharge Point?
Choose the format by where the metals concentrate and what infrastructure already exists. The table below pairs common situations with the formats we supply. Our post on choosing a stormwater BMP that cuts dissolved pollutant load covers the wider decision.
| Situation | Format to consider | Note |
|---|---|---|
| Metals reach several storm drain inlets across a yard | Ultra Urban® Filter catch basin insert | Custom-fabricated to each basin and retrofits without excavation; stainless steel inserts carry a 20-year warranty |
| Existing pressure vessel, skid, tank or vault | Bulk Smart Sponge® HM media | Loaded into infrastructure you already own |
| Vault or channel with tight space or access | Smart Pak® or Smart Bags | Deploys media where larger hardware will not fit |
| One consolidated discharge point | EOP unit | Treats flow before it reaches the outfall |
| Higher flow needing an engineered polishing step | Smart Skid | Installed with pumps, pressure and flow controls, so it is not a power-free format |
Catch basin inserts such as the Ultra Urban® Filter also address solids, so one inlet can handle debris and TSS while HM media works on the dissolved metals. Our explainer on the catch basin insert filter for stormwater shows how the two work together.
What Should You Gather Before Specifying Treatment?
- Lab reports that separate dissolved from total zinc and copper, ideally from several storms.
- A map of roofs, galvanized structures, scrap areas and paved traffic zones that drain to each outfall.
- The benchmark or effluent target in your permit, and the corrective action history under your SWPPP.
- Typical and peak flow at each discharge point, plus available space and who will service the system.
- Whether a laboratory column test on your own water sample, or a pilot for a larger application, is worth doing first.
Every Abtech project starts with a site assessment that reviews these inputs before any system is specified. Federal permit benchmarks and corrective action language are documented in EPA's NSCEP document record, which is a useful reference to have beside your permit when you scope the work.
FAQ: Zinc and Copper Treatment
Does Smart Sponge® HM replace the sediment controls I already have?
No. Solids controls still capture particle-bound metal, while Smart Sponge® HM is aimed at the dissolved fraction that passes through them. Most sites keep both.
Is zinc from a galvanized roof treated differently from zinc from scrap?
Once in runoff, both are dissolved zinc, and the media targets the metal rather than its origin. What changes is the flow pattern and concentration: a roof drains steadily at the downspout, while a scrap area varies with stockpile activity and storm intensity. The assessment captures that difference.
Is every format passive?
No. Catch basin inserts run without pumps or power, but Smart Skid systems are installed with pumps, pressure and flow controls. We match the format to your site's constraints.
Do I need column or pilot testing first?
Not always. Testing on your own water is useful when metal loading varies widely or the application is large, because the dissolved share of zinc and copper can differ by site and season. Your assessment findings show whether that step earns its place before you commit to a full installation.
Related resources
- Dissolved vs Total Metals in Stormwater: What Your Lab Report Means for Treatment
- What Causes Heavy Metals in Stormwater? Zinc, Copper, Lead and Arsenic Sources by Site Type
- Metal Recycling Facility Stormwater Treatment: Zinc, Copper, and Lead Reduction at the Catch Basin
- Choosing a Stormwater BMP That Actually Cuts Dissolved Pollutant Load
- Catch Basin Insert Filter for Stormwater: How Ultra Urban® Filter and Smart Sponge® Media Work Together
- Bacteria Removal Stormwater E. coli: A Permit Holder's Guide — Abtech Industries
- PFAS Removal From Stormwater: Diagnosis Guide for MS4/NPDES — Abtech Industries
- PFAS Removal from Stormwater: How It Works & How to Choose — Abtech Industries