On-site hydrogen peroxide generation for industrial water treatment

On-site hydrogen peroxide generation is most plausible where a plant regularly consumes dilute peroxide and delivered chemical creates substantial storage or logistics costs. The generator must meet the required dose using the site’s water quality. Compare cost per kilogram of active peroxide successfully delivered to treatment, including pretreatment, replacement parts and periods of low utilisation.

Delivered peroxide and on-site generation

The useful comparison is between two complete ways of supplying a treatment process. Delivered peroxide includes purchasing, transport, storage, dilution and dosing. On-site generation includes electricity, feedwater conditioning, electrochemical equipment, maintenance and any backup chemical. Both must achieve the same treatment outcome. A lower chemical-supply cost is irrelevant if the new arrangement requires more oxidant or cannot maintain the concentration needed by the downstream process.

HPNow describes commercial equipment that forms peroxide electrochemically from water, electricity and air. Its product architecture targets low-concentration generation at the point of use. That establishes a concrete equipment category, while the supplier’s statements about efficiency, purity and reliability still require application-specific verification. The system should not be confused with every new research electrode: a commercial peroxide generator does not prove that a separately published calcium-tolerant coating has been industrialised.

The European Commission’s PeroxyPro reporting record documents industrialisation, pilot installations and first commercial sales during a project ending in 2022. These are beneficiary-reported outcomes, not a guarantee for a new installation. Their practical significance is that an operator can request operating references and maintenance experience. A feasibility study should obtain information from sites with comparable demand and water chemistry, rather than relying exclusively on the electrochemical principle.

Feedwater quality and required peroxide concentration

Feedwater quality is a purchasing specification. Hardness, dissolved salts, suspended material and organic contamination can affect different parts of the system. A claim of calcium tolerance cannot establish tolerance to every component of natural water, and absence of visible scale does not prove stable electrochemical selectivity. Ask for the guaranteed feedwater envelope, the sampling method used to establish compliance and the consequences of exceeding it. Include filters, conditioning, reject-water disposal and service access in the equipment boundary.

Concentration defines where decentralisation can create value. A water-treatment plant may consume dilute peroxide directly, whereas another chemical process may need a concentrated feedstock. Producing dilute material and subsequently concentrating it is a different process with additional energy and handling requirements. The supplier should state production rate as active hydrogen peroxide, not simply litres of solution. Any impurities or additives in the generated liquid must also be compatible with the actual treatment and discharge requirements.

Utilisation, treatment trials and operating cost

Utilisation is often more important than the nominal generator rating. Consider an illustrative unit with €12,000 of annualised fixed equipment and service costs. At 6,000 kilograms of active peroxide per year, this contributes €2 per kilogram; at 2,000 kilograms, it contributes €6 before electricity and other variable costs. A site with short seasonal peaks may favour a smaller generator supplemented by purchased chemical, rather than owning capacity that stands idle most of the year.

An operational trial should maintain the same treatment target while comparing the two supply routes. Record active dose, treatment effectiveness, energy, cleaning, operator time and interruption frequency. In advanced oxidation, the result also depends on the associated equipment and water matrix, so a generator efficiency measurement cannot substitute for complete process performance. A fair trial includes periods of representative feedwater variation and demand change. Short operation on ideal water mainly establishes commissioning success.

Concentrated chemical inventory and electrochemical equipment create different operating obligations. Reduced deliveries may simplify one part of the plant, while electrical equipment, membranes and dosing controls add another maintenance requirement. The site should establish appropriate handling, process protection and the authorisation conditions of its intended use. No claim that the molecule decomposes to water and oxygen removes those duties. Purchase is justified when the full installation meets the treatment requirement with acceptable availability and a lower supported lifetime cost.