New process control strategy for wastewater chlorination and dechlorination using ORP/pH
1The University of Seoul, Dept. of Environmental Engineering, Seoul, Korea. h_kim@uos.ac.kr
Summary
This study introduces a new ORP/pH method to optimize chlorine and sulfite doses for wastewater disinfection and dechlorination. This approach ensures effective microbial destruction while protecting aquatic ecosystems.
Area of Science:
- Environmental Science
- Water Treatment Technology
- Analytical Chemistry
Background:
- Chlorination is a common wastewater disinfection method due to its efficiency and low cost.
- Optimal chlorine and sulfite dosing is crucial for complete microbial inactivation and aquatic life protection.
- Current methods may lack precision in determining optimal chemical dosages.
Purpose of the Study:
- To develop and validate a novel ORP/pH-based approach for optimizing chlorination and dechlorination processes.
- To establish precise endpoints for breakpoint chlorination and dechlorinating titrations.
- To determine optimal chlorine and sulfite dosages for effective wastewater treatment.
Main Methods:
- Utilized a new approach based on Oxidation-Reduction Potential (ORP) and pH measurements.
- Monitored significant inflection points on ORP and pH profiles during chlorination and dechlorination titrations.
- Applied these significant points to determine chlorine demand and required sulfite dosage.
Main Results:
- The ORP/pH-based method successfully identified endpoints for breakpoint chlorination and dechlorination.
- The approach enabled accurate determination of chlorine demand and optimal sulfite dosage.
- Validated the effectiveness of the new method in optimizing chemical application for wastewater treatment.
Conclusions:
- The ORP/pH-based titration offers a precise and efficient way to optimize chlorine and sulfite doses in wastewater treatment.
- This method enhances the reliability of disinfection and dechlorination processes.
- Contributes to improved water quality protection and regulatory compliance.
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