Zeolite for Emergency & Disaster Potable Water Media

Q: Which contaminants does zeolite capture in emergency drinking water?

Natural clinoptilolite works on the basis of cation exchange (CEC 1.6–2.0 meq/g), so it is effective against cationic contaminants such as ammonium (NH₄⁺) and some heavy-metal cations (Pb²⁺, Cd²⁺, Cu²⁺, etc.). In the drinking-water tests by Mažeikienė et al. (2010), the removal efficiency for an initial ammonium solution of 2 mg/L was reported in the range of roughly 70–94% depending on particle size. However, zeolite itself has no disinfection or sterilization capability, so a separate disinfection process such as UV, chlorine, or membranes is required to block pathogenic microorganisms.

Q: Can zeolite also remove fluoride, arsenic, and nitrate nitrogen?

Fluoride (F⁻), arsenic (AsO₄³⁻/AsO₃³⁻), and nitrate (NO₃⁻) are all anions or oxyanions. Unmodified clinoptilolite has a negatively charged framework, so anion adsorption is weak, and metal (Ca, La, Fe, Al) loading or surfactant modification (SMZ) treatment is effectively a prerequisite. It is incorrect to explain the removal of these anions using cation-exchange logic. In fact, Mažeikiene et al. (2008) also reported that natural zeolite has low efficiency for nitrate removal, and a household water treatment study (2024) likewise used modified zeolite for fluoride and arsenic removal.

Q: Which particle size (mesh) should I use?

For the packed bed (column) of emergency purifiers and portable purification systems, Fine to Medium Granule (14×40 to 30×50 mesh), which offers good permeability and backwash stability, is generally considered. Mažeikiene et al. (2010) reported a trend of higher ammonium removal efficiency with finer particles, but if the material is too fine, packed-bed pressure loss and reduced flow become significant, so particle size is determined by balancing it against treatment flow rate and pressure loss.

Q: What should be done when the packed bed becomes saturated?

Clinoptilolite that has adsorbed ammonium can have its ion-exchange sites regenerated with an NaCl (brine) solution. Mažeikiene et al. (2010) reported regeneration using an approximately 10% NaCl solution. However, emergency and disaster sites often lack regeneration infrastructure, so operating single-use cartridges that are replaced after reaching a certain throughput is realistic. It is advisable to calculate the breakthrough point in advance from the raw-water concentration, flow rate, and packing volume.

Q: Can I receive a sample for testing?

Yes, KMIZEOLITE supports the provision of samples for validating emergency water purification media. On the sample request page, please specify the target contaminants (ammonium, heavy metals, etc.), the treatment flow rate, and the desired particle size.

Emergency & Disaster Drinking Water: What Is the Problem

In disaster situations such as earthquakes, floods, typhoons, power outages, and broken water mains, normal water-treatment plant supply is cut off. At evacuation shelters for displaced residents, military field sites, and overseas relief sites, contaminated groundwater or surface water must be treated to a potable level within a short time. The most common contamination factors in these cases are turbidity, ammoniacal nitrogen (ammonium), some heavy metals, and pathogenic microorganisms. In particular, in water sources affected by sewage, livestock, or landfill leachate, ammonium concentrations are high and easily exceed the drinking-water standard (the World Health Organization WHO guideline of about 0.5 mg/L).

Because portable and small-scale purification systems operate in environments where power, chemicals, and maintenance infrastructure are limited, adsorption and ion-exchange media that reduce specific contaminants simply by passing water through a packed bed (column) without a separate power source are considered as auxiliary materials. Here, natural clinoptilolite is used as a medium for ammonium and cation removal. However, zeolite has no disinfection function, and its limitations against anionic contaminants are clear, so applicability is determined by which contaminant is targeted.

Why Zeolite Is Considered as an Emergency Water Purification Medium

Natural clinoptilolite, based on its negatively charged aluminosilicate framework and cation-exchange capacity (CEC 1.6–2.0 meq/g), selectively captures cationic contaminants in water. In the emergency drinking-water context, the key target is ammonium (NH₄⁺), and some heavy-metal cations such as lead, cadmium, and copper are also reduced. Mažeikiene et al. (2010) reported that when an initial 2 mg/L ammonium solution was passed through a packed bed of natural zeolite (clinoptilolite content 70–75%) in a drinking-water treatment test, the removal efficiency ranged from about 70–94% depending on particle size (DOI:10.3846/jeelm.2010.07).

Structurally, uniform micropores of 4.0–7.0 Å in size and a specific surface area of 40.0 m²/g provide adsorption sites, and a stable pH range of 3.0–10.0 keeps the framework from collapsing under various raw-water conditions. KMIZEOLITE's clinoptilolite, at 97% purity, is mined and processed at the Amargosa Valley mine in Nevada, USA, and as a natural mineral adsorbent it complies with FDA GRAS (21 CFR 182.2729) for general use.

The important limitations must also be made clear. Fluoride (F⁻), arsenic (oxyanions), and nitrate (NO₃⁻), which are frequently problematic in emergency drinking water, are all anionic, so adsorption by unmodified clinoptilolite with its negatively charged framework is weak. To target these anions, metal (Ca, La, Fe, Al) loading or surfactant modification (SMZ) treatment is effectively a prerequisite. Mažeikiene et al. (2008) also reported low nitrate-removal efficiency for natural zeolite (DOI:10.3846/1648-6897.2008.16.38-44), and a household water treatment study (2024) likewise proposed an approach of treating lead with natural zeolite and fluoride and arsenic with modified zeolite (DOI:10.1186/s42834-024-00209-x).

KMIZEOLITE Key Properties

Property	Value
Clinoptilolite purity	97%
Cation-exchange capacity (CEC)	1.6–2.0 meq/g
Specific surface area	40.0 m²/g
Pore diameter	4.0–7.0 Å
Stable pH range	3.0–10.0
Hardness	4.0–5.0 Mohs
Thermal stability	700°C
Specific gravity	1.89
Bulk density	45–54 lbs/ft³
Certifications	OMRI KMI-10365, FDA GRAS, TSCA, EN-71-3

Emergency Water Purification Application Examples (Packed-Bed Media Focus)

Below are representative scenarios in which clinoptilolite is considered as a packed-bed medium in emergency and disaster drinking-water treatment. In every case, zeolite does not replace the disinfection process, and modification is a prerequisite for anion targets.

Portable purification system packed bed: Granular zeolite is packed into a column to reduce ammonium and some heavy-metal cations. A multi-stage configuration placed in series with sand filtration, activated carbon, and UV/chlorine disinfection
Emergency purifier cartridge: Single-use cartridges replaced after reaching a certain throughput are packed with granular zeolite and used until ammonium breakthrough
Pretreatment medium: Upstream of membranes (reverse osmosis, ultrafiltration), the ammonium and cation load is lowered to ease the burden on downstream processes
Anion-targeting modified medium: For water sources where fluoride, arsenic, or nitrate is the problem, metal-loaded or SMZ-modified zeolite is applied as a separate stage (adsorption with unmodified material is weak)
Pilot validation: With a small sample, the ammonium removal efficiency and breakthrough curve for the target raw water are verified in advance

Recommended Particle Size and Product Specifications

For the packed bed of emergency purifiers and portable systems, Fine to Medium Granule (14×40 to 30×50 mesh), which offers good permeability and backwash stability, is generally considered. Mažeikiene et al. (2010) reported a trend of higher ammonium removal efficiency with finer particles, but excessive fineness increases pressure loss and reduces flow, so particle size is determined by balancing it against the treatment flow rate.

Product Group	Mesh	Particle Size	Typical Use
Powder	100 mesh or finer	<150μm	Pozzolan, feed, powder adsorption
Fine Granule	30×50 mesh	0.3–0.6mm	Water treatment, filtration, soil
Medium Granule	14×40 mesh	0.4–1.4mm	Filter beds, bedding, litter
Coarse Granule	8×14 mesh	1.4–2.4mm	Swimming pools, deicing, large-scale filtration
Extra Coarse	4×8 mesh	2.4–4.8mm	Packed beds, air scrubbers

→ View products by mesh size · Product selection guide by application

Pilot Testing and Field Review Points

When applying zeolite to emergency and disaster drinking-water purification, the following items must be checked together.

Target contaminant classification: First distinguish whether the target is an ammonium/heavy-metal cation or an anion such as fluoride, arsenic, or nitrate. Anions are weakly effective with unmodified clinoptilolite, so metal-loaded or SMZ-modified media are reviewed separately
Concurrent disinfection process: Zeolite cannot kill pathogens such as bacteria, viruses, and protozoa. For potability, a disinfection/barrier process such as UV, chlorine, or membranes must be included in series
Removal efficiency and breakthrough calculation: Calculate the breakthrough point in advance from the raw-water ammonium concentration, flow rate, and packing volume, and verify the actual efficiency within the 70–94% range through batch/column testing
Competing co-existing cations: If hardness/salinity components such as Ca²⁺, Mg²⁺, K⁺, and Na⁺ are abundant, they compete with ammonium for ion-exchange sites, so verify performance in the actual raw-water matrix
Regeneration vs. replacement: The packed bed can be regenerated with an approximately 10% NaCl solution, but at disaster sites lacking regeneration infrastructure, single-use cartridge replacement is realistic
Regulatory and material suitability: Confirm in advance the hygienic-safety compliance of drinking-water-contact materials and the operating procedures. Professional engineering review must always precede application

The basic properties of ammonium ion exchange and the isotherm and thermodynamic parameters were compiled by Tosun (2012) for clinoptilolite (DOI:10.3390/ijerph9030970), and the ammonium sorption behavior of natural clinoptilolite was reported by Sprynskyy et al. (2005) (DOI:10.1016/j.jcis.2004.10.058).

→ View TDS (Technical Data Sheet) · View MSDS (Safety Data Sheet)

Emergency & Disaster Drinking Water FAQ

Which contaminants does zeolite capture in emergency drinking water?

Natural clinoptilolite works on the basis of cation exchange (CEC 1.6–2.0 meq/g), so it is effective against cationic contaminants such as ammonium (NH₄⁺) and some heavy-metal cations (Pb²⁺, Cd²⁺, Cu²⁺, etc.). In the drinking-water tests by Mažeikiene et al. (2010), the removal efficiency for an initial ammonium solution of 2 mg/L was reported in the range of roughly 70–94% depending on particle size. However, zeolite itself has no sterilization or disinfection capability, so a separate disinfection process such as UV, chlorine, or membranes is required to block pathogenic microorganisms.

Can zeolite also remove fluoride, arsenic, and nitrate nitrogen?

Fluoride (F⁻), arsenic (AsO₄³⁻/AsO₃³⁻), and nitrate (NO₃⁻) are all anions or oxyanions. Unmodified clinoptilolite has a negatively charged framework, so anion adsorption is weak, and metal (Ca, La, Fe, Al) loading or surfactant modification (SMZ) treatment is effectively a prerequisite. It is incorrect to explain the removal of these anions using cation-exchange logic. In fact, Mažeikiene et al. (2008) also reported that natural zeolite has low efficiency for nitrate removal, and a household water treatment study (2024) likewise used modified zeolite for fluoride and arsenic removal.

Which particle size (mesh) should I use?

For the packed bed (column) of emergency purifiers and portable purification systems, Fine to Medium Granule (14×40 to 30×50 mesh), which offers good permeability and backwash stability, is generally considered. Mažeikiene et al. (2010) reported a trend of higher ammonium removal efficiency with finer particles, but if the material is too fine, packed-bed pressure loss and reduced flow become significant, so particle size is determined by balancing it against treatment flow rate and pressure loss. Please refer to the product selection guide by application.

What should be done when the packed bed becomes saturated?

Clinoptilolite that has adsorbed ammonium can have its ion-exchange sites regenerated with an NaCl (brine) solution. Mažeikiene et al. (2010) reported regeneration using an approximately 10% NaCl solution. However, emergency and disaster sites often lack regeneration infrastructure, so operating single-use cartridges that are replaced after reaching a certain throughput is realistic. It is advisable to calculate the breakthrough point in advance from the raw-water concentration, flow rate, and packing volume.

Can I receive a sample for testing?

Yes, KMIZEOLITE supports the provision of samples for validating emergency water purification media. On the sample request page, please specify the target contaminants (ammonium, heavy metals, etc.), the treatment flow rate, and the desired particle size.

Inquiries and Sample Requests

If you are considering applying zeolite in the emergency and disaster drinking-water purification media field, please contact us through the channels below.

Notice

Applicability may vary depending on site conditions, regulations, and test results. Before actual application, a test review tailored to the site conditions must always be carried out first. Zeolite does not replace the disinfection of drinking water, and it is appropriate to understand it not as a cure-all for this field but as a material that supplements existing water-purification processes.