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Treatment performance comparison between regular O3-BAC and O3-BAC with rear sand filtration: verification in a
Kai Yang1,2, Jianwei Yu1,2, Qingyuan Guo1,3
1Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Beijing 100085, China.
Environmental Sciences Europe
|March 22, 2021
Summary
Placing sand filters after ozonation and biologically activated carbon (O3-BAC) filtration reduces turbidity but decreases removal of organic matter and micropollutants. This configuration impacts the durability of activated carbon in drinking water treatment.
Area of Science:
- Environmental Science
- Water Treatment Engineering
Background:
- Ozonation and biologically activated carbon (BAC) filtration are key for safe drinking water.
- A novel O3-BAC-sand configuration places sand filtration after O3-BAC.
Purpose of the Study:
- To evaluate the performance of O3-BAC-sand versus traditional sand-O3-BAC systems.
- To compare particle, turbidity, CODMn, odorant, and pesticide removal efficiencies.
Main Methods:
- Full-scale water treatment plant study.
- Comparative analysis of two O3-BAC configurations: O3-BAC-sand and sand-O3-BAC.
Main Results:
- O3-BAC-sand showed lower turbidity but higher CODMn compared to sand-O3-BAC.
- Sand-O3-BAC was more effective for septic and musty odorants.
- Total pesticide removal was 72% for O3-BAC-sand and 78% for sand-O3-BAC, with shorter carbon lifespan for O3-BAC-sand.
Conclusions:
- Relocating sand filters post-BAC reduces organic matter and micropollutant removal efficiency.
- Increased particle load on BAC in the O3-BAC-sand system compromises its performance.
- Enhanced coagulation may be needed to improve turbidity and particle removal in O3-BAC-sand systems.
