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Preparation, characterization and application of a composite bioflocculant
Tianju Zhu1,2, Jiao Song1, Xiaoling Zhou3
1College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu, People's Republic of China.
Environmental Technology
|January 22, 2024
Summary
A novel composite bioflocculant (CBF) effectively treats shale gas fracturing flowback fluid. This bioflocculant, combining Polymeric aluminium ferric sulphate (PAFS)-Poly (diallyl dimethyl ammonium chloride) (PDM) with bacterial polysaccharide, achieved an 89.43% COD removal rate.
Area of Science:
- Environmental Science
- Chemical Engineering
- Biotechnology
Background:
- Shale gas exploitation generates fracturing flowback fluid, posing environmental challenges.
- Conventional treatment methods may be insufficient for complex wastewater streams.
Purpose of the Study:
- To develop and evaluate a composite bioflocculant (CBF) for treating shale gas fracturing flowback fluid.
- To investigate the coagulation mechanisms of the CBF.
Main Methods:
- Preparation of composite bioflocculant (CBF) from Polymeric aluminium ferric sulphate (PAFS), Poly (diallyl dimethyl ammonium chloride) (PDM), and bacterial polysaccharide.
- Characterization of CBF and analysis of its performance in removing turbidity and Chemical Oxygen Demand (COD).
- Zeta potential analysis to elucidate coagulation mechanisms.
Main Results:
- The CBF, containing an aluminium-iron hydroxyl polymer, demonstrated stable performance at pH 7.0.
- Optimal CBF dosage of 2500 mg·L⁻¹ resulted in an 89.43% COD removal rate.
- Coagulation mechanisms include electrical neutralization, adsorption bridging, and charge neutralization.
Conclusions:
- The developed CBF is effective for treating shale gas fracturing flowback fluid.
- Both chemical and biological components contribute to the flocculation efficiency.
- Understanding the mechanisms aids in optimizing wastewater treatment processes.
