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Removing textile mill effluent recalcitrant COD and toxicity using the H2O2/UV system.

A H Mounteer¹, T A Leite, A C Lopes

¹Civil Engineering Department, Federal University of Viçosa, 36570-000, Viçosa Minas Gerais, Brazil. ann@ufv.br

Water Science and Technology : a Journal of the International Association on Water Pollution Research

|October 8, 2009

Summary

The H2O2/UV process effectively removes color, COD, and toxicity from textile effluent, enhancing biodegradability for subsequent biological treatment. Optimal conditions improve effluent quality without impacting BOD.

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Area of Science:

Environmental Chemistry
Water Treatment Technologies

Background:

Industrial textile effluent poses environmental challenges due to color, chemical oxygen demand (COD), and toxicity.
Pre-treatment of textile wastewater is crucial for effective downstream biological treatment.

Purpose of the Study:

To evaluate the H2O2/UV process for textile effluent quality improvement.
To determine the optimal conditions (pH, H2O2 dose, reaction time) for pollutant removal.

Main Methods:

Multivariate experimental design to assess H2O2/UV treatment parameters.
Laboratory-scale treatment of industrial textile effluent.
Monitoring of color, COD, toxicity, BOD, and average oxidation state.

Main Results:

Increased reaction time and H2O2 dose significantly improved removal efficiencies.
Optimal conditions (pH 7, 5 mmol L(-1) H2O2, 120 min) achieved 70% color, 21% COD, and 67% toxicity reduction.
Effluent biodegradability (BOD/COD) increased by 28%, with partial destruction of azo dyes.

Conclusions:

The H2O2/UV process is a viable pre-treatment for textile effluent.
Optimized H2O2/UV treatment enhances effluent biodegradability and prepares it for biological processes.
The study provides key insights into optimizing AOP-biological treatment combinations.