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Trihalomethanes aqueous solutions sono-oxidation.

Hilla Shemer¹, Nava Narkis

¹Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel. sarass@tx.technion.ac.il

|June 30, 2005

Summary

Ultrasonic irradiation and Fenton's oxidation were tested for removing trihalomethanes (THMs). Combining these methods enhanced the degradation of some THMs but did not improve overall mineralization.

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Area of Science:

Environmental Chemistry
Water Treatment Technologies
Advanced Oxidation Processes

Background:

Trihalomethanes (THMs) are common disinfection byproducts in drinking water.
Effective removal of THMs is crucial for public health and environmental safety.
Investigating novel degradation methods for THMs is an ongoing research area.

Purpose of the Study:

To evaluate the efficacy of ultrasonic (US) irradiation, hydrogen peroxide (H(2)O(2)), Fenton's oxidation, and their combinations for THM removal.
To assess the degradation and removal of specific THMs: chloroform, bromodichloromethane, dibromochloromethane, bromoform, and iodoform.
To determine the impact of these processes on the mineralization of THMs.

Main Methods:

Aqueous solutions containing five different trihalomethanes were subjected to ultrasonic irradiation.
Hydrogen peroxide and Fenton's reagent were applied individually and in combination with US irradiation.
Degradation efficiency and mineralization of THMs were analyzed.

Main Results:

Hydrogen peroxide alone showed no significant effect on THM sonodegradation.
Combined US and Fenton processes enhanced the sonodegradation of bromoform (CHBr(3)).
Iodoform (CHI(3)) was primarily degraded by Fenton's oxidation during sonication/Fenton treatment.
The mineralization of the THM mixture was not significantly affected by any of the tested combined processes.

Conclusions:

The combination of ultrasonic irradiation and Fenton's oxidation offers enhanced degradation for specific THMs like bromoform and iodoform.
While effective for certain compounds, the combined processes did not improve the overall mineralization of the THM mixture.
Further optimization of advanced oxidation processes is needed for comprehensive THM removal and mineralization in aqueous solutions.

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