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What is AOP?

Advanced Oxidation Processes generate highly reactive hydroxyl radicals (OH•) that non-selectively attack and mineralise organic compounds. For breweries, AOP provides a polishing step when advanced biological treatment cannot achieve required effluent standards.

Hydroxyl Radicals

OH• radicals have oxidation potential of 2.8V, second only to fluorine. They attack virtually all organic compounds.

Non-Selective

Unlike advanced biological treatment, AOP attacks refractory compounds including phenols, colour compounds, and persistent organics.

Mineralisation

Complete breakdown to CO2, water, and inorganic salts - no secondary waste streams like with chemical precipitation.

Rapid Reaction

Reaction times of seconds to minutes compared to hours for biological processes. Compact footprint.

AOP Treatment Sequence

1. Pre-Treatment

Screening and solids removal to protect AOP equipment and improve efficiency

2. Oxidant Generation

Ozone generation, UV activation, or peroxide dosing creates reactive species

3. Reaction Chamber

Controlled contact time allows radical attack on organic compounds

4. Post-Treatment

Residual oxidant quenching and final polishing before discharge

AOP Configurations for Breweries

Ozone + UV (O3/UV)

UV light photolyzes ozone to produce hydroxyl radicals. Highly effective for colour removal and refractory organics.

  • Best for: Colour, odour, phenolic compounds
  • Ozone dose: 50-200 mg/L
  • Contact time: 10-30 minutes
  • Energy: 15-25 kWh/kg O3

UV + H2O2 (UV/Peroxide)

UV photolysis of hydrogen peroxide generates hydroxyl radicals. Simple, safe oxidant handling.

  • Best for: COD polishing, trace organics
  • H2O2 dose: 100-500 mg/L
  • UV dose: 500-2000 mJ/cm²
  • Contact time: 5-15 minutes

Ozone + H2O2 (Peroxone)

Combines ozone and peroxide for enhanced radical production. Most powerful AOP configuration.

  • Best for: High-strength, complex organics
  • O3:H2O2 ratio: 1:0.5 to 1:2
  • Highest oxidation capacity
  • Contact time: 15-45 minutes

Catalytic AOP

Uses catalysts (Fe²+, TiO2) to enhance radical generation. Lower energy requirements.

  • Best for: Cost-sensitive applications
  • Fenton-like reactions
  • Lower oxidant consumption
  • Sludge generation consideration

When to Choose AOP for Brewery Wastewater

ScenarioRecommended TreatmentWhy
BOD < 5,000 mg/L, space availableBiological (MBR, SBR)Lower Operating expenditure, proven for brewery organics
BOD 5,000-15,000 mg/LAnaerobic + Aerobic + AOP polishingEnergy recovery + compliance assurance
Colour/odour issues persist after biologicalAOP (O3/UV)Targets refractory compounds
Very strict discharge limits (COD < 100 mg/L)Biological + AOP polishingGuarantees compliance
Limited space, high BODAOP standaloneCompact footprint, rapid treatment
Variable flow/loadingEqualization + Biological + AOPStabilises feed to AOP
Reuse/recycle goalsBiological + AOP + FiltrationProduces high-quality effluent

AOP Applications in Brewery Wastewater

Colour Removal

Brewery wastewater often has persistent brown colour from melanoidins and hop compounds. AOP breaks these chromophores, achieving clear effluent when advanced biological treatment leaves residual colour.

Typical result: 80-95% colour reduction

Odour Control

Volatile compounds from fermentation and spent grain create odour issues. AOP oxidises these to odorless compounds, essential for facilities near residential areas.

Typical result: >90% odour reduction

COD Polishing

When advanced biological treatment cannot achieve strict COD limits (<125 mg/L), AOP provides the final polishing step to ensure compliance.

Typical result: 40-70% COD reduction

Water Reuse

For breweries targeting water reuse (bottle washing, cooling towers), AOP provides the advanced treatment needed to meet reuse quality standards.

Typical result: COD < 50 mg/L, no pathogens

Disinfection

AOP provides simultaneous disinfection, eliminating bacteria, yeast, and other microorganisms without chlorine residuals.

Typical result: >4-log pathogen reduction

High-Strength Streams

Yeast waste, tank bottoms, and spent grain pressate can have BOD >50,000 mg/L. AOP can treat these concentrated streams.

Typical result: >95% organics destruction

AOP Cost Considerations

Capital Cost

Typically -2,000 per m³/day capacity. Higher than biological but offset by smaller footprint and no sludge handling.

Operating Cost

-2.00 per m³ depending on strength. Main costs: electricity (ozone/UV), oxidant chemicals, maintenance.

vs Biological

AOP Operating expenditure is 3-5x higher than biological. Best used as polishing step, not primary treatment for high-BOD streams.

project benefits Factors

Avoided discharge penalties, water reuse benefits, reduced sludge disposal, and smaller footprint can justify AOP investment.

Related Equipment & Systems

Equalization Tanks

Flow balancing before AOP to ensure consistent oxidant dosing and treatment efficiency.

View Tanks

Pre-Filtration

Remove suspended solids that shield organics from oxidation and protect UV lamps.

View Filters

Biological Treatment

Primary BOD reduction before AOP polishing for efficient combined treatment.

Biological Options

Online Monitoring

COD, UV254, and ozone residual analysers for optimised AOP operation.

SCADA Systems

Related Pages

Advanced Oxidation

Advanced oxidation processes for recalcitrant industrial organics.

View Page

Brewery Anaerobic Digestion

Anaerobic digestion systems for breweries and distilleries.

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Brewery Biological Treatment

Anaerobic and aerobic advanced biological treatment for brewery wastewater.

View Page

Brewery Cider Wine

Wastewater treatment for cideries and wineries.

View Page

Brewery Contract

Wastewater treatment for contract and multi-brand brewing facilities.

View Page

Brewery Craft Commercial

Scaleable wastewater treatment for craft breweries, microbreweries and commercial production facilities.

View Page

Option G: AOP Containerised

Containerised AOP systems: ozone/UV, Fenton reaction, hydrogen peroxide oxidation.

View Containerised Option

Not sure if AOP is right for your brewery?

Our engineers can analyse your wastewater and recommend the optimal Treatment Process.

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