Rainwater
GEH® redefines rainwater purification: efficient removal of heavy metals, so rainwater can be safely discharged and channelled.
- Phosphate removal from surface water
- Remediation of eutrophic waters
- Remediation of eutrophic waters
Why it matters
Rainwater is a valuable resource
Rainwater running off metal roofs or through roof drains often carries heavy metals — copper and zinc ions — that are environmentally harmful and can’t simply be returned to the water cycle. The same applies to rainwater from parking lots and busy streets, which picks up lead and nickel from exhaust fumes and tyre abrasion. So how can rainwater be cleaned of heavy metals and other pollutants? We’ve found an environmentally friendly and economical solution.
- Good to know:
GEH® works precisely and effectively thanks to its patented manufacturing process. It is dust-free and therefore easy to pour into filter containers — and it reaches you simply and cleanly, in big bags or plastic drums, according to your needs.
Versatile adsorber
Remove copper, zinc, nickel and lead from rainwater
Removing unwanted substances from rainwater takes a very specific filter material. A versatile adsorber has proven effective at removing many different pollutants and heavy metals at once: GEH® reliably and completely removes copper, zinc, nickel and lead from rainwater. So what explains its remarkable effectiveness?
How it works
Granulated iron hydroxide for rainwater purification
GEH® consists of iron hydroxide granules — an adsorbent that selectively removes heavy metals and pollutants. During adsorption, unwanted substances adhere to the surface of the granules and are easily and completely removed from the system. GEH® is simple to implement, needs no major maintenance, combines well with other processes such as precipitation, and copes with fluctuating inflow volumes — making it a sustainable and particularly economical way to treat rainwater.
Broad-spectrum removal
GEH® for the removal of
From roof run-off to road drainage, one adsorbent binds the metals and compounds that make rainwater unsafe to discharge.
As
Arsenic
Cu
Copper
Mo
Molybdenum
U
Uranium
V
Vanadium
PO₄
Phosphate
Pb
Lead
Ni
Nickel
Cu
Copper
Sb
Antimony
H₂O₂
Hydrogen peroxide
H₂S
Hydrogen sulphide
Compliance made simple
A clean water cycle, free of heavy metals
Complying with global regulations isn’t easy — GEH® makes it simple. The filter material meets all international requirements, including the European standard DIN EN 15029 and NSF Standard 61, so you can meet environmental regulations anywhere while hitting your own economic targets. Compared to other stormwater treatment methods, significantly less GEH® is needed. Want to design your system for gravity flow and do away with electrical power? No problem — ask us about our best practices.
Individual treatment of rainwater. We’ll advise you. One size fits all doesn’t exist in water treatment — every application has its own requirements. Our team helps you size your system correctly and recommends economical operating conditions. We do this worldwide, and we’re happy to visit you on-site.
Individual treatment of rainwater. We’ll advise you. One size fits all doesn’t exist in water treatment — every application has its own requirements. Our team helps you size your system correctly and recommends economical operating conditions. We do this worldwide, and we’re happy to visit you on-site.
- Characteristics
| Chemical composition | β-FeOOH and Fe(OH)3 |
|---|---|
| dry matter content | 58% (± 10%) |
| Iron content, based on dry matter | 600 g/kg (± 10 %) |
| Grain size range | 0.2 - 2.0 mm |
| Undersized grain percentage | < 10% |
| Total undergrain + overgrain | < 20% |
| Bulk density, backwashed | 1150 kg/m3 (± 10 %) |
| Specific surface area (BET method) | approx. 300 m2/g |
- Recommended operating conditions
| Fill height of the absorber bed | 0.8 - 1.6 m |
|---|---|
| Freeboard height | 50% of the fill height |
| Filter speed | ≤ 20 m/h |
| Empty bed time (EBCT) | ≥ 3 minutes |
| Permissible pressure loss | max. 0.5 bar |
| Backwash speed | 26 m/h (water flush only) |
| Backwash duration | until the clear water drains |
For further information, the following downloads are available for you.
PDF data sheets — click to download.
- Do you have questions or need a quick answer? We look forward to your message.