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Enhancing pollutant removal efficiency through multi-flow cascade flocculation and flotation reactor: a detailed flow
Qingji Wang1,2,3, Hao Wang1,2, Xiumei Sun1,2
1CNPC Research Institute of Safety and Environment Technology Beijing 102206 China.
RSC Advances
|February 10, 2025
Summary
A novel multi-stage cascade flocculation and flotation reactor (MCFR) significantly improves oilfield wastewater treatment. This efficient system rapidly removes turbidity and oil, offering a faster solution than traditional methods.
Area of Science:
- Environmental Engineering
- Chemical Engineering
- Water Treatment Technologies
Background:
- Oilfield wastewater poses environmental challenges due to high oil content and complex composition.
- Existing treatment methods often struggle with efficiency and treatment time.
- Advanced reactor designs are needed for effective oil and gas industry wastewater management.
Purpose of the Study:
- To develop and evaluate a novel multi-stage cascade flocculation and flotation reactor (MCFR) for oilfield wastewater treatment.
- To investigate the internal flow dynamics and their impact on pollutant removal.
- To compare the performance of the MCFR with traditional stirred flocculation reactors.
Main Methods:
- Development of a multi-stage cascade flocculation and flotation reactor (MCFR).
- Utilization of Particle Image Velocimetry (PIV) to analyze internal flow fluid distribution.
- Conducting flocculation experiments with specific dosages of polymerized ferrous sulfate (PFS) and polyacrylamide (PAM) at controlled flow rates.
Main Results:
- Optimal flow rates (100-150 L h-1) promote efficient flocculant-wastewater interaction and oil droplet coalescence.
- Vortex generators aid in floc and droplet aggregation, facilitating separation via flotation and sedimentation.
- The MCFR achieved 95% turbidity and 94% oil removal, significantly outperforming traditional reactors (82% and 78% respectively) with a treatment time under 1 minute.
Conclusions:
- The MCFR demonstrates superior efficiency and speed in treating oilfield wastewater compared to conventional methods.
- The reactor design facilitates rapid pollutant removal through enhanced flocculation and flotation processes.
- Findings offer valuable insights for designing advanced wastewater treatment systems for the oil and gas sector.
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