Advanced Reduction Processes: A New Class of Treatment Processes.
Bhanu Prakash Vellanki1, Bill Batchelor, Ahmed Abdel-Wahab
1Department of Civil Engineering, Texas A&M University , College Station, Texas.
Environmental Engineering Science
|July 11, 2013
Summary
Advanced reduction processes (ARPs) use activation methods and reducing agents to create reactive radicals that degrade oxidized contaminants. Ultraviolet light-activated sulfite proved effective for contaminant removal.
Area of Science:
- Environmental Chemistry
- Water Treatment Technologies
Background:
- Oxidized contaminants pose environmental and health risks.
- Existing treatment methods may have limitations in efficacy or scope.
- Advanced Reduction Processes (ARPs) offer a novel approach to contaminant degradation.
Purpose of the Study:
- To introduce and define Advanced Reduction Processes (ARPs).
- To screen various combinations of activation methods and reducing agents for ARP effectiveness.
- To identify optimal conditions for degrading specific oxidized contaminants.
Main Methods:
- Batch screening experiments evaluated combinations of UV light, ultrasound, electron beam, and microwaves with dithionite, sulfite, ferrous iron, and sulfide.
- Target contaminants included perchlorate, nitrate, PFOA, and 2,4-dichlorophenol at varying pH levels.
- Kinetic experiments focused on nitrate and perchlorate degradation using the most effective ARP.
Main Results:
- The combination of sulfite activated by ultraviolet light (UV-L) was identified as an effective ARP.
- Nitrate degraded more rapidly than perchlorate under UV-L/sulfite treatment.
- Treatment efficacy for both nitrate and perchlorate increased with higher pH levels.
Conclusions:
- ARPs effectively generate reducing radicals capable of degrading oxidized contaminants.
- UV-L activated sulfite is a promising ARP for environmental remediation.
- Further research is warranted to elucidate degradation kinetics and mechanisms.
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