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Advanced Oxidation Process (AOP) - ALMA OXI Fenton

Advanced Oxidation Process (AOP process) with the Fenton process for the elimination of trace substances from wastewater

AOP process: Fenton process

ALMA OXI Fenton

The ALMA OXI Fenton process effectively eliminates poorly degradable substances by adding iron(II) sulphate and hydrogen peroxide in a two-stage, mixed reactor. The addition of iron(II) sulphate in a defined pH range leads to the formation of highly reactive hydroxyl radicals from the hydrogen peroxide. These radicals oxidize substances that are difficult to biodegrade and bind them in a sludge floc.

The two-stage design of the reactor increases the conversion of the iron(II) sulphate and thus makes it possible to save on consumables.

Technical data

Main applications

Pharmaceutical industry
Paint and varnish industry Chemical industry Textile industry

Hydraulic power

20 - 1,000 m³/d

System design

Batch or throughput

Elimination performance of selected trace substances

> 90 %

Your experts for Fenton systems - directly accessible

Dominik Hoffmann

Head of Project Development

dominik.hoffmann@almawatech.com

+49 160 532 50 43

Maksim Neubauer

Head of International Project Development

maksim.neubauer@almawatech.com

+49 175 6474 123

Compact Fenton system for the oxidation of hard-to-degrade wastewater constituents

The ALMA OXI Fenton is a system for Advanced Oxidation Processes, or AOP for short. The controlled addition of iron(II) salt and hydrogen peroxide produces highly reactive hydroxyl radicals. These attack organic compounds that are difficult to biodegrade and can oxidize them, break them down, or make them more easily accessible for subsequent treatment stages.

Reaction Conditions

pH Adjustment and Iron Dosage

The wastewater is adjusted to the project-specific pH range. A defined amount of iron(II) salt is then added as a catalyst.

Fenton Oxidation

Formation of reactive hydroxyl radicals

Hydrogen peroxide reacts with the iron catalyst. The resulting radicals oxidize organic wastewater components that are difficult to biodegrade.

Aftercare

Neutralization and Solid-Liquid Separation

After oxidation, the water is neutralized. Iron compounds and bound reaction products are precipitated as flocs and separated from the treated water.

When is the Fenton process appropriate?

Organic substances that are difficult to biodegrade For wastewater in which the remaining organic load cannot be sufficiently reduced by biological treatment.
Pharmaceutical and Chemical Trace Substances For the treatment of selected drug residues, organic complexing agents, dyes, and other oxidizable micropollutants.
Colored or toxic industrial wastewater For wastewater from paint, varnish, textile, chemical, and pharmaceutical processes containing complex organic compounds.
Improving Biodegradability Partial oxidation can break down complex molecules and thereby support downstream biological treatment.
Advanced Treatment for Water Reuse To reduce organic residues prior to filtration, activated carbon, membrane processes, or on-site water reuse.

What determines the design of the Fenton system?

Treatability of Target Substances Not every substance responds equally well to a Fenton oxidation process. The actual removal efficiency must be tested using actual wastewater.
Optimal pH Range Reaction rate and chemical consumption depend largely on the correct pH setting.
Dosage of Iron and Hydrogen Peroxide The quantities of reagents are adjusted based on the pollutant load, the reaction objective, and any side reactions that may occur.
Reaction Time and Residence Time The required treatment duration affects reactor volume, throughput, and achievable oxidation capacity.
Downstream Solid Waste Treatment The iron-containing sludge produced during neutralization must be reliably separated and treated.