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Arsenic Removal Water Treatment Companies
Arsenic treatment, adsorption media, oxidation/coprecipitation, and membrane-based removal for drinking water.
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- Suppliers with food-beverage sector experience
- Providers operating in United Kingdom or India
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Designing Arsenic Removal Systems for Drinking Water Compliance
Arsenic in drinking water is regulated at 10 µg/L under WHO 2017 Guidelines, EU DWD 2020, and USEPA Safe Drinking Water Act. Naturally occurring arsenic in groundwater (Bangladesh, India West Bengal, Vietnam Red River Delta, US Southwest, parts of Argentina and Chile) exceeds 50–500 µg/L in many shallow aquifers. Dominant treatment technologies are adsorption onto granular ferric hydroxide (GFH), granular ferric oxide (GFO), or titanium dioxide media (capacity 5–15 mg As/g, EBCT 3–5 min), coagulation-filtration with ferric chloride (3–5 mg Fe per mg As to reduce below 10 µg/L), and reverse osmosis (>95% rejection).
Speciation drives treatment choice: As(V) — the oxidized arsenate form dominant in oxygenated surface water and chlorinated groundwater — is readily adsorbed and coagulated. As(III) — the reduced arsenite form dominant in anoxic groundwater — must be pre-oxidized with chlorine (1–2 mg/L for 30 min), permanganate (1–2 mg/L), or solid-phase MnO₂ filters before adsorption to achieve sub-10 µg/L effluent. Skipping oxidation is the most common cause of breakthrough in real-world deployments.
Spent media is regulated as TCLP-hazardous waste in the US if leachable As exceeds 5 mg/L; landfilling typically requires cement stabilization. For point-of-entry systems serving small communities below 1,000 people, adsorptive media is preferred over coagulation-filtration due to operational simplicity and lower operator skill requirement. For utility-scale above 10 ML/day, coagulation-filtration is typically lower OPEX. Aguato lists arsenic-removal providers across utility-scale, small-community, and POE duties.
Frequently Asked Questions
Why does arsenic speciation matter for treatment selection?
Arsenate (As V) is anionic at typical drinking water pH and adsorbs strongly to ferric/titanium oxide media or co-precipitates with ferric chloride. Arsenite (As III) is uncharged and adsorbs poorly. Anoxic groundwater is dominated by As(III), so a pre-oxidation step (free chlorine 1–2 mg/L, KMnO₄ 1–2 mg/L, or solid-phase MnO₂ contactor) is mandatory ahead of adsorption to achieve sub-10 µg/L effluent reliably.
How long does a granular ferric hydroxide bed last in arsenic removal?
GFH capacity is typically 5–10 g As per kg media at EBCT 3–5 min and influent 50–100 µg/L As(V). Bed life depends on competing anions — phosphate at 0.5–2 mg/L roughly halves capacity; silica above 20 mg/L reduces capacity 20–40%. Expect 80,000–250,000 bed volumes between media changeouts at typical groundwater conditions. Always run a column test on actual source water before sizing.
Is reverse osmosis a good choice for arsenic removal?
RO achieves >95% rejection of both As(V) and As(III), so it works without pre-oxidation. However, RO recovers only 50–80% of feed water and requires concentrate disposal — typically the deal-breaker for inland small communities. RO is ideal where arsenic coexists with other contaminants (fluoride, uranium, nitrate, TDS) and a single barrier solves multiple problems. For arsenic-only duty, adsorption or coagulation-filtration is almost always cheaper.
How do I dispose of spent arsenic-laden media or sludge?
In England and Wales, spent arsenic-laden media or coagulation sludge is classified under the Waste Framework Directive and UK Hazardous Waste Regulations. If leachate testing shows arsenic above the hazardous waste threshold, the material must be consigned through a licensed hazardous waste carrier and disposed of at an approved hazardous waste treatment or landfill facility. The Environment Agency EWC code 19 09 02 applies. Always confirm the waste classification and disposal pathway with the EA before the media replacement is scheduled.
A small water company serving a rural community from a chalk borehole was finding arsenic concentrations of 28 to 45 micrograms/L in the raw water, exceeding the WS(WQ)R 2016 limit of 10 micrograms/L. The supply was under a DWI enforcement notice requiring treatment to be in service within 18 months.
Granular ferric hydroxide (GFH) adsorption contactors were installed with an EBCT of 4 minutes, sized for the peak seasonal borehole yield. A pre-oxidation stage using 1.5 mg/L free chlorine was included to convert any As(III) to As(V) ahead of the GFH beds. Online arsenic monitoring at the treated water outlet provided continuous assurance of performance against the 10 micrograms/L limit.
Treated water arsenic fell consistently below 3 micrograms/L, providing a 70% compliance margin against the 10 micrograms/L limit. The DWI enforcement notice was lifted following 6 months of compliant monitoring data. The GFH bed operated for 26 months before the first media replacement was required, within the designer's predicted 24 to 30-month service life.
Questions to Ask Shortlisted Providers
- 1
Have you analysed the speciation of arsenic in our source water to determine the As(III) to As(V) ratio, and does your design include pre-oxidation if As(III) is present?
Arsenite (As III) is poorly adsorbed by ferric media without prior oxidation; failing to specify pre-oxidation is the most common cause of post-installation arsenic breakthrough in groundwater systems.
- 2
What competing anions are present in our source water (phosphate, silica, fluoride) and how have you accounted for their effect on GFH or GFO bed life in your sizing?
Competing anions can reduce adsorptive capacity by 30 to 50%, shortening bed life and increasing media replacement frequency beyond what generic design curves predict.
- 3
What is the spent media classification and disposal route you have identified, and is the disposal cost included in your 5-year total cost of ownership estimate?
Arsenic-laden spent media may be a hazardous waste; disposal cost is typically omitted from capital-only proposals and can represent GBP 5,000 to GBP 20,000 per media replacement cycle.
- 4
Does your system include online arsenic monitoring at the treated water outlet, and at what arsenic concentration does the system automatically divert or alarm?
Offline sampling with 2 to 4 week laboratory turnaround cannot detect GFH exhaustion in time to prevent non-compliant water reaching supply; online monitoring is essential for DWI compliance assurance.
- 5
What WRAS and DWI Regulation 31 approvals do the GFH media and associated treatment chemicals hold, and can you provide the documentation as part of the commissioning handover?
GFH media used in drinking water treatment must be WRAS approved and may require DWI Regulation 31 prior approval; these documents are required before the system can legally enter service on a public water supply.
What Drives Cost in This Category
Higher arsenic concentrations reduce media bed life and increase media replacement frequency; presence of As(III) requires an additional pre-oxidation stage that adds both capital and chemical operating cost.
Elevated phosphate or silica in the source water can halve GFH media life, doubling the annual media replacement cost compared to a low-competition source water.
Continuous online arsenic analysers at the treated water outlet cost GBP 15,000 to GBP 40,000 per installation but are increasingly expected by DWI for small supplies, and are essential for detecting breakthrough before a compliance failure occurs.
If the spent GFH is classified as hazardous waste under the UK Hazardous Waste Regulations, disposal costs are significantly higher than for non-hazardous waste; this cost must be modelled explicitly over the expected system life.
Key Regulations & Standards
Sets the arsenic parametric value of 10 micrograms/L at the point of supply for all drinking water in England and Wales, with DWI enforcement powers if the limit is exceeded.
Granular ferric hydroxide or any other adsorptive media installed as a new treatment process on a public water supply requires prior DWI approval before entering service.
Spent arsenic-laden treatment media that exceeds the hazardous substance threshold for arsenic is classified as hazardous waste and must be consigned, transported, and disposed of under the Duty of Care regime.
All media, vessels, and associated fittings in contact with drinking water must appear on the Water Regulations Advisory Scheme approved products list.