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Nitrate Removal Water Treatment Companies
Nitrate removal, ion exchange, RO, biological denitrification, and electrochemical processes.
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Nitrate Removal from Drinking Water: Ion Exchange, Biological Denitrification, and RO Treatment
Nitrate (NO3-) contamination in drinking water sources arises from agricultural fertiliser application (nitrogen leaching to groundwater, typically 20 to 300 mg per L NO3 in affected aquifers), livestock manure, and septic tank effluent. WHO Drinking Water Guideline: 50 mg per L NO3 (11.3 mg per L NO3-N); EU DWD 2020 parametric value: 50 mg per L; US EPA MCL: 10 mg per L NO3-N (44.3 mg per L as NO3). Methemoglobinemia (blue baby syndrome) risk in infants below 6 months fed formula made with high-nitrate water at above 50 mg per L NO3; colorectal cancer associations in epidemiological studies at elevated nitrate exposure.
Ion exchange (IX) using nitrate-selective anion resins (Type II strong base anion, quaternary ammonium with tributylamine selectivity for NO3- over SO42-) is the most widely installed technology for community water systems. Design: EBCT 2 to 5 minutes, service velocity 10 to 20 m per hr, regeneration with 10 to 15 percent NaCl brine every 100 to 500 bed volumes depending on influent nitrate and resin type. Nitrate-selective resins avoid chromatographic peaking (where standard Type I SBA resins displace captured nitrate at concentrations above inlet during SO42--loaded regeneration). Product water nitrate below 10 mg per L NO3-N achievable. Spent regenerant (high-nitrate brine at 1,000 to 5,000 mg per L NO3-N) requires disposal: sewer (with trade effluent consent at diluted concentration), agricultural land application, or biological denitrification of the regenerant.
Biological denitrification uses heterotrophic bacteria (Paracoccus denitrificans, Pseudomonas denitrificans) in anoxic fixed-bed biofilters to reduce NO3- to N2 gas, using methanol, ethanol, or acetic acid as carbon source. Stoichiometry: 2.47 g methanol per g NO3-N removed. Design: HRT 20 to 45 minutes, carbon dose 3 to 4 mg CH3OH per mg NO3-N (slight excess to ensure complete denitrification), effluent residual TOC monitoring required (excess carbon dosing causes TOC breakthrough, requiring activated carbon polishing). Biological denitrification achieves NO3 below 1 mg per L with proper operation. Regulatory acceptance in the UK (Environment Agency guidance) and US (AWWA standards) requires validation data and ongoing performance monitoring. Product water must be disinfected before distribution.
Frequently Asked Questions
What is the safest level of nitrate in drinking water?
WHO (2011) Drinking Water Guideline: 50 mg per L nitrate (NO3-), expressed as 11.3 mg per L as nitrate-nitrogen (NO3-N). EU DWD 2020: 50 mg per L NO3. US EPA primary MCL: 10 mg per L as nitrogen (NO3-N), equivalent to 44.3 mg per L as NO3, reflecting a more protective limit. The US limit is specifically protective of methemoglobinemia risk in infants below 6 months. The WHO value is based on a similar health endpoint but uses a different calculation basis. For adults and children above 6 months, risk of methemoglobinemia at 50 mg per L NO3 is very low; emerging epidemiological evidence links chronic nitrate exposure above 25 mg per L with increased colorectal cancer risk, which is driving scientific review of current guideline values in both US and EU.
How does ion exchange remove nitrate from water?
Nitrate-selective ion exchange uses a strong base anion (SBA) resin loaded with chloride ions (Cl- form). As groundwater flows through the resin bed, nitrate (NO3-) ions exchange with chloride ions on the resin surface (NO3- affinity for Type II SBA resin is approximately 3 times higher than Cl-), removing nitrate from solution and releasing chloride into the treated water. When the resin is exhausted (breakthrough of NO3 above treatment target), the bed is regenerated with 10 to 15 percent sodium chloride (NaCl) brine solution, which displaces captured nitrate from the resin and restores it to Cl- form. Key selection point: nitrate-selective resins must be specified (Type II quaternary ammonium with tributyl or tripropyl alkyl groups), as standard Type I SBA resins preferentially exchange sulphate over nitrate, causing nitrate chromatographic peaking during regeneration.
Can reverse osmosis remove nitrate?
Yes. Polyamide thin-film composite RO membranes reject nitrate at 95 to 99 percent. For a feed water at 100 mg per L NO3, a single-pass RO system achieves permeate at 1 to 5 mg per L NO3, well below the 50 mg per L EU DWD limit. RO provides simultaneous removal of other contaminants (arsenic, atrazine, PFAS, hardness) making it attractive for multi-contaminant situations. Limitations vs IX for nitrate-only removal: RO wastes 15 to 30 percent of water as concentrate (vs less than 5 percent for IX at 95 percent recovery); RO produces excessively pure water (may need remineralisation for taste and corrosion control); energy consumption 0.3 to 1.5 kWh per m3 (vs 0.1 to 0.5 kWh for IX). For small community supplies with mixed contamination, RO is often more practical; for large groundwater systems where nitrate is the sole target, IX at higher recovery is more economical.
What happens to the nitrate removed by ion exchange?
Nitrate removed by ion exchange ends up concentrated in the spent regenerant brine at 1,000 to 5,000 mg per L NO3-N in a brine volume equivalent to 3 to 5 bed volumes (approximately 5 to 10 percent of total water treated). Regenerant disposal options: (1) Sewer disposal - acceptable if the sewerage undertaker's trade effluent consent includes nitrogen; the WWTP can biologically denitrify the additional nitrogen load; (2) Agricultural land application - high-nitrate brine applied as a nitrogen fertiliser under IPPC/IED permit conditions; timing must coincide with crop uptake periods; (3) On-site biological denitrification of regenerant - a biological system uses methanol or acetic acid to denitrify the concentrated brine before sewer disposal, eliminating nitrate load; (4) Blending with treated effluent for dilution before disposal. Concentrating 10 mg per L NO3-N in feed water to 1,000 mg per L in regenerant (100 times concentration) produces 10 L of high-strength brine per m3 of treated water.
A groundwater source supplying 4,200 properties had nitrate concentrations of 70 to 85 mg per L NO3, consistently above the EU DWD parametric value of 50 mg per L. Blending with a lower-nitrate borehole (30 mg per L) was insufficient to meet compliance on its own. The utility needed a reliable, long-term treatment solution sized for 1,800 m3 per day.
A nitrate-selective ion exchange system (two lead-lag vessels, Type II SBA resin, EBCT 4 minutes, NaCl regeneration at 15 percent) was installed. The IX system treated 60 percent of the flow, blended with 40 percent bypass to achieve 35 to 42 mg per L nitrate in the blended product. Spent regenerant (high-nitrate brine) was tanked and sent by agreement to a local agricultural cooperative for use as a liquid nitrogen fertiliser during spring application periods.
Blended supply nitrate dropped to 35 to 42 mg per L across all monitoring points within three months of commissioning. DWI approval was granted six months after start-up. Regenerant disposal cost was offset 60 percent by the fertiliser value, reducing the net disposal cost to 8,000 GBP per year.
Questions to Ask Shortlisted Providers
- 1
What is the nitrate concentration, seasonal range, and co-occurrence of sulphate and chloride in the feed water?
Sulphate competes with nitrate on standard SBA resins and causes chromatographic peaking; nitrate-selective resins and resin sizing must be based on the actual water chemistry.
- 2
What is the agreed disposal route and consent for spent regenerant brine?
Brine at 1,000 to 5,000 mg per L NO3-N cannot go to sewer without trade effluent consent; the disposal logistics must be contractually agreed before the system is designed.
- 3
What is the permitted discharge standard for the treated water and the blending ratio?
The IX bypass blending ratio determines the required IX effluent quality; tighter standards require higher IX resin capacity and lower bypass fraction.
- 4
Is biological denitrification an option and what is the source of organic carbon for the reaction?
Biological denitrification achieves below 1 mg per L NO3 but requires a methanol or acetic acid dosing system and more complex process management than IX.
- 5
What DWI approval process applies to the IX resin and regenerant chemicals?
Resin and regenerant chemicals must appear on the DWI List of Approved Products; new resins may require WRAS testing and DWI approval before use in drinking water.
What Drives Cost in This Category
IX system capital cost scales with resin volume; high-nitrate feeds require more resin capacity and more frequent regeneration, increasing NaCl consumption and brine disposal costs.
Tanker haulage and agricultural disposal adds 15,000 to 60,000 GBP per year; on-site biological denitrification of brine eliminates haulage but adds 200,000 to 500,000 GBP capital.
Brine storage, mixing, and dosing infrastructure can represent 20 to 30 percent of total system capital cost depending on regenerant volume and storage requirement.
Regulatory approval adds 6 to 18 months to the project programme; sampling, analysis, and DWI correspondence costs typically add 30,000 to 80,000 GBP to the project.
Key Regulations & Standards
Set the parametric value for nitrate at 50 mg per L; require DWI approval for all IX resins and chemicals used in treatment of drinking water.
50 mg per L NO3 (11.3 mg per L as NO3-N) is the compliance standard in England and Wales; DWI monitors compliance and can require corrective action under Regulation 28.
Governs agricultural nitrate application in Nitrate Vulnerable Zones; affects regenerant disposal to agricultural land and the timing, rate, and record-keeping requirements for brine application.
Spent regenerant brine disposal to sewer requires prior written consent from the sewerage undertaker; application must detail brine composition, volume, and discharge schedule.








