Abstract
A green, high-efficiency flocculant based on hyperbranched polyethylenimine-grafted cellulose (hPEI-CE) was designed and successfully synthesized. The flocculation performance of the hPEI-CE with different amino group contents for treating simulated kaolin wastewater was evaluated in terms of turbidity, floc size, and zeta potential. Without the help of any coagulant aid, hPEI-CE with an amino group content of 3.97 mmol/g presented the best removal efficiency for kaolin particles. The residual turbidity of kaolin suspension decreased from original 490 NTU to 4 NTU under the optimized conditions, i.e., 2.4 mg/L of hPEI-CE flocculant at pH 7.0 for 30 min. Furthermore, two types of industrial wastewater were used to investigate the flocculation performance of hPEI-CE: silk printing and dyeing wastewater and machining wastewater. Total suspended solid (TSS), chemical oxygen demand (COD), and turbidity reduction reached up to 73.4%, 95.7%, and 87.4% for silk printing and dyeing wastewater, 96.2%, 79.9%, and 93...
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