Na Li,Yuping Fan,Xianshu Dong,Qingxia Liu,Xiaomin Ma,Ruxia Chen
In this study, in order to improve the flocculation efficiency of natural organic flocculant in coal mine wastewater, guar gum (GG) and [2-(methacryloyloxy) ethyl] trimethyl ammonium chloride (DMC)were used to synthesize a type of graft copolymer of GG with DMC (GG-g-DMC) with flocculating function by free radical polymerization under ultraviolet (UV) light initiation conditions. Performance testing and structural characterization of the composites including FTIR, NMR, XRD, SEM, TG, and XPS were conducted to verify the synthesis of the graft polymer. The GG-g-DMC was applied to treat coal mine wastewater, according to the sedimentation index and the optimal flocculation solution was determined, and the flocculation settling mechanism was studied using focused beam reflectance measurement (FBRM), Zeta potentiometer and adhesion force meter. The results indicated that GG-g-DMC synthesis by UV-initiated polymerization was feasible and the settling effect increased significantly; 0.5 mg/g (s) GG-g-DMC 4 was excellent in all aspects, its sedimentation speed reached 20.64 cm/min, the light transmittance was 95.00%, and the compression layer thickness was 1.89 cm; the mechanism is mainly the synergy of charge neutralization, bridging, and improve hydrophobicity.
In this paper, we investigate the flocculation performance of composite coagulants polyaluminium chloride (PAC) and cationic polyacrylamide (CPAM) for landscape water treatment. The flocculant CPAM was synthesized through low-pressure UV initiation in our laboratory. This method was an environment-friendly and efficient approach. The flocculation mechanism of the combined flocculant was further analyzed by Fourier-transform infrared spectroscopy, three-dimensional fluorescence analysis, zeta potential and microscopic observation. Results indicated that turbidity, UV 254 , phosphorus, and algae were effectively removed using PAC/CPAM flocculants. Humus and protein were easily removed from landscape water through flocculation. Moreover, electrical neutralization of PAC and the adsorption bridging effect of CPAM were found to be dominant in flocculation. The flocs from using PAC/CPAM were more compacted and stabilized than those from using PAC or CPAM alone. In addition, the appropriate divided addition of PAC was favorable for flocculation.
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