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A microsieve-based filtration process for combined sewer overflow treatment with nutrient control: Modeling and
Tiziana Venditto1, Michele Ponzelli2, Siva Sarathy3
1Department of Chemical and Biochemical Engineering, Western University, 1151 Richmond Street, London, Ontario, N6A 3K7, Canada.
Water Research
|December 1, 2019
Summary
A new integrated water treatment process effectively removes combined sewer overflow pollutants and nutrients. This innovative method uses zeolite, powdered activated carbon, and polymer-enhanced microsieving for simultaneous contaminant and nutrient reduction.
Area of Science:
- Environmental Engineering
- Water Treatment Technologies
- Pollutant Removal
Background:
- Combined sewer overflows (CSOs) release diverse contaminants, challenging conventional water treatment.
- Existing methods struggle to simultaneously address particulate matter, chemical oxygen demand, and nutrient pollution from CSOs.
Purpose of the Study:
- To develop an integrated treatment process for the simultaneous removal of CSO pollutants and nutrients (nitrogen and phosphorus).
- To optimize treatment variables including polymer type, adsorbent dosage, and microsieve size.
Main Methods:
- Utilized zeolite and powdered activated carbon for adsorbing soluble pollutants.
- Employed polymer-enhanced microsieving for particulate removal.
- Applied design-of-experiment techniques and response surface modeling for analysis and optimization.
Main Results:
- Identified synergistic effects between cationic polymer, zeolite, powdered activated carbon, and microsieving.
- Determined optimal conditions: 1.1 mg/L cationic polymer, 250 mg/L zeolite, 5 mg/L powdered activated carbon, and 370 μm mesh size.
- Achieved significant pollutant reductions: 72% turbidity, 56% total Kjeldahl nitrogen, 35% chemical oxygen demand, and 75% total phosphorus.
Conclusions:
- Demonstrated the feasibility of a single-step integrated process for multiple water treatment objectives.
- The developed process offers a viable solution for municipalities facing combined sewer overflow and nutrient management challenges.
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