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Abstract
A high flocculation performance composite flocculant was prepared with sodium alginate, polyaluminium ferric chloride and cationic polyacrylamide. And the composite flocculant was used in papermaking wastewater treatment. Results indicated that it achieve the best flocculation performance when the raw material mass ratio was 2:1:1, the dosage of the composite flocculant was 20 mg/L, and the removal efficiency of COD and turbidity with this composite flocculant reached 89.6% and 99.2%, respectively.
Highlights
Papermaking wastewater contains lignin, cellulose, difficult degradation substances and many tiny colloidal materials [1,2,3]
A high flocculation performance composite flocculant was prepared with sodium alginate, polyaluminium ferric chloride and cationic polyacrylamide
The composite flocculant was used in papermaking wastewater treatment
Summary
Papermaking wastewater contains lignin, cellulose, difficult degradation substances and many tiny colloidal materials [1,2,3]. Flocculation is widely used to papermaking wastewater pretreatment or advanced treatment [4]. Flocculants are the materials, which are used in fast solid-liquid separations. They act on a molecular level on the surfaces of the particles to reduce repulsive forces and increase attractive forces [5]. Sodium alginate is a flocculation reinforcing agent in papermaking wastewater treatment and it is acted as a framework material in flocculation. It will accelerate the forming of flocculation particles and shorten the time of flocculation
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