Glossary

Electrochemical Oxidation & Disinfection Glossary

Straight definitions for the terms used across this site — 49 terms across 8 categories, written for a quick check before a vendor call, not a marketing gloss.

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How to use this glossary

Definitions, grouped by where they matter

Terms are grouped by function — electrochemistry, electrode materials, oxidation mechanisms, byproducts, disinfection, engineering, metrics, and regulatory language — rather than a flat A-to-Z list, so a definition sits next to the ones you’d actually need alongside it.

Core Electrochemistry & Reactor Terms

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Electrode Materials

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Oxidation Mechanisms & Radicals

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Water Chemistry & Byproducts

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Disinfection & Ozone

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Treatment Train & Engineering

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Performance & Verification Metrics

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Regulatory & Compliance

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Category 1

Core Electrochemistry & Reactor Terms

The vocabulary of the reactor itself — what’s actually happening at the electrodes.

See MMO & BDD Reactor Products
A treatment process that uses electrical current at an electrode surface to directly or indirectly oxidize and break down pollutants in water, without adding oxidizing chemicals.
The vessel containing the anode, cathode, and wastewater (electrolyte) where electrochemical oxidation takes place.
The electrode where oxidation occurs — pollutants lose electrons here, either directly or via radicals generated at its surface.
The electrode where reduction occurs, typically producing hydrogen gas as a byproduct of water electrolysis.
The applied current divided by electrode surface area, usually in A/m² — a primary design parameter controlling both reaction rate and electrode wear.
The wastewater’s ionic strength, which determines how efficiently current passes through it; higher conductivity generally lowers energy cost per unit treated.
The fraction of applied electrical current actually used for the target oxidation reaction, versus side reactions like gas evolution.
The extra voltage required beyond the theoretical minimum to drive a reaction at a practically useful rate.
A titanium-substrate anode coated with metal oxides (commonly RuO2/IrO2), offering cost-efficient oxidation for COD, color, and general organics.
An electrode with a boron-doped diamond coating delivering the highest oxidation potential of common EO electrode types, used for refractory organics and PFAS destruction.
The formal technical name for MMO-type electrodes, referring to their resistance to dimensional change and dissolution during operation.
The operating duration before an electrode’s active coating degrades enough to require replacement, strongly dependent on current density and chloride content.
Buildup of scale, organics, or precipitates on the electrode surface that reduces active surface area and oxidation efficiency over time.

Category 2

Electrode Materials

What the anode is made of, and why that choice changes everything downstream.

See Electrode Products

Category 3

Oxidation Mechanisms & Radicals

How the pollutant actually gets broken down, at the molecular level.

See Pollutant Fit Ratings
Destruction of a pollutant molecule through direct electron transfer at the electrode surface, without an intermediate oxidant.
A highly reactive, short-lived oxidant generated at the anode from water oxidation; one of the strongest oxidants available for breaking down organic pollutants.
Pollutant destruction driven by oxidants (such as active chlorine or persulfate) generated in-situ from the water matrix, rather than direct electron transfer.
Chlorine-based oxidants (e.g., hypochlorous acid) generated in-situ from chloride ions present in the wastewater, contributing to mediated oxidation.
The general category of oxygen-based radicals and oxidants — including hydroxyl radicals — responsible for oxidative destruction of pollutants.
Complete breakdown of an organic pollutant into carbon dioxide, water, and inorganic ions — the destruction endpoint, as opposed to partial transformation.

Category 4

Water Chemistry & Byproducts

What can form alongside the intended reaction, and how it’s tracked.

See PFAS & Fluorinated Organics
Byproducts that can form from active chlorine species in high-chloride matrices under aggressive EO operating conditions — a disclosed limitation, not an assumed non-issue.
A measure of all organic carbon present in water, used alongside COD to track overall organic load and destruction progress.
A measure of all organically bound fluorine in water, used to verify PFAS destruction by tracking whether fluorine is being converted to free fluoride.
The appearance of free fluoride ion during treatment of fluorinated compounds — the key indicator that C-F bonds are being mineralized, not just transformed.
Compounds formed when oxidants react with natural organic matter or bromide/iodide in water, relevant whenever ozone or chlorine-based oxidation is used.
A regulated disinfection byproduct that can form when ozone reacts with bromide in the source water — a key risk factor in ozone dose sizing.

Category 5

Disinfection & Ozone

Terms specific to pathogen control and ozone-based advanced oxidation.

See Ozone Generator Products
Equipment that produces ozone gas on-site, typically via corona discharge, for use in disinfection or advanced oxidation.
Any process that generates hydroxyl radicals (via ozone, UV, EO, or combinations) to destroy organics beyond what disinfection alone achieves.
The product of disinfectant concentration and contact time, the standard metric for sizing a disinfection process against a pathogen log-reduction target.
A logarithmic measure of pathogen or contaminant reduction — each additional log represents a 10-fold decrease in concentration.
The concentration of dissolved ozone remaining in water after initial demand is satisfied, used to confirm adequate disinfection dose.
Equipment that breaks down unreacted ozone gas before venting, a required safety component of any ozone system.
The electrical discharge method most commonly used to generate ozone from oxygen or air in an ozone generator.
The full sequence of treatment stages a wastewater passes through — equalization, primary separation, EO, polishing — rather than any single technology in isolation.
A buffer tank that dampens flow and concentration swings before treatment, protecting downstream processes including EO from shock loading.
A treatment approach designed to leave no liquid effluent, typically ending in evaporation/crystallization, with EO often used as pretreatment ahead of it.
Pretreatment addresses a stream before its primary treatment step (e.g., protecting a digester); polishing addresses residual contaminants after primary treatment, ahead of discharge.
The three stages of scale-up: bench (liters, lab conditions), pilot (containerized skid, real flow), and commercial (full production-scale system).
Laboratory or field testing conducted on a specific wastewater to confirm a technology’s performance before it is sized or purchased.
A pre-assembled treatment system built on a transportable frame or shipping-container footprint, common for pilot and modular commercial EO systems.

Category 6

Treatment Train & Engineering

How EO fits into a larger system, and the scale-up path to get there.

See Industry Solutions

Category 7

Performance & Verification Metrics

How a result is actually measured, and the difference between removal and destruction.

See Case Studies
Removal describes a pollutant leaving the water phase (which can include adsorption or transfer); destruction specifically means the molecule has been broken down.
The specific energy consumption of an EO system, the standard basis for comparing operating cost across electrode types and reactor designs.
A bulk measure of the oxygen required to chemically oxidize organic matter in water — a general load indicator, not a destruction confirmation for any specific compound.
A measure of the oxygen consumed by microorganisms breaking down organic matter, used to gauge biodegradability of a wastewater stream.
An analytical method that tracks a specific named compound directly, used to confirm destruction of a specific pollutant rather than relying on a bulk parameter like COD.
The practice of reporting oxidation byproducts (e.g., chlorate) alongside performance data, rather than reporting removal figures alone.
The maximum allowable concentration or load of a parameter a facility may release, set by the relevant regulatory authority and specific to each site and jurisdiction.
A U.S. regulatory classification (relevant to certain PFAS compounds in recent EPA actions) that can trigger cleanup liability — a reminder that PFAS regulatory status is actively evolving.
The phenomenon by which microorganisms evolve resistance to antibiotics, a growing concern behind stricter scrutiny of antibiotic-bearing wastewater discharge.
A water quality specification for reuse applications (irrigation, cooling makeup, industrial reuse), often stricter on refractory organics than standard discharge limits.

Category 8

Regulatory & Compliance

Language that shows up in permits and policy discussions around EO applications.

See Regulatory Watch

These terms describe steps in the same engineering workflow

Treatability testing, bench and pilot scale, byproduct disclosure — every term above shows up somewhere in the four-stage sequence used across this site.

See the Full Engineering Workflow
Browse Reactor & Electrode Products

Knowing the term isn't the same as confirming the result

Mineralization, destruction, log reduction — all of these are verified on your water before a commercial-scale claim is made.

Browse Trial & Pilot Modules
  • Trial module — first-pass screening against MMO or BDD electrodes
  • Bench module — confirms removal rate, byproducts, and energy demand
  • Pilot module — containerized skid validated under real flow conditions
  • Commercial-scale system — engineered from pilot data, not a glossary definition alone

Terms engineers double-check before signing off

Field notes on the definitions that get misused most often.

“‘Removal’ and ‘destruction’ get used interchangeably in vendor decks constantly. I stop and ask which one a number actually means before I trust it.”
“COD reduction is not the same claim as destroying a named compound. If a report only has COD, I ask for the target-analyte method before I sign off.”
“Byproduct disclosure isn’t a footnote to me — chlorate and perchlorate numbers change whether a system is even permittable in my state.”
“Coating life claims are meaningless without the current density they were measured at. I ask for that number specifically, every time.”

Practical Engineering

Why glossary accuracy matters more than it looks like it should

A blurred definition of ‘removal’ versus ‘destruction,’ or a regulatory term left stale after a rule changes, can shift a permit decision or a capital commitment. Every definition here is reviewed by our engineers, cross-checked against how the term is used elsewhere on this site, and updated when usage or regulation shifts.

Engineer-reviewed definitions

Every term is checked by our process engineers, not paraphrased from a generic dictionary.

Consistent with site-wide usage

Definitions match exactly how each term is used across Industry, Pollutant, Application, and Case Study pages.

Regulatory terms flagged as evolving

Compliance-related definitions note where the underlying regulation is actively changing, not stated as fixed fact.

Updated as terminology shifts

Definitions are revised as industry usage or regulatory language changes, not published once and left static.

This glossary in numbers

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Engineering stages every term ties back to
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Definitions are the starting point. These are the pages where they get applied.

Industry Solutions

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Pollutant Fit Ratings

See which compounds EO destroys well.

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Applications

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Product Catalog

MMO electrodes, ozone generators, EO reactors.

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Before you move on

Glossary FAQ

Yes — use the request button on this page and we’ll add it, reviewed the same way as every other definition.
Grouping by function means related terms — like removal vs. destruction, or COD vs. TOC — sit next to each other, which is more useful when you’re learning the distinction.
They reflect standard industry and engineering usage; where a term is used narrowly on this site (e.g., a specific fit-rating tier), that’s noted in context on the relevant page, not here.
They describe the general concept accurately; always verify current numeric limits and designations for your jurisdiction via the Regulatory Watch page or official sources.

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  • Current treatment, if any, and its failure point
  • Any term or concept you'd like clarified further
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