Preparation of a New Inorganic-Organic Composite Dual-Coagulant and Application of Oily Wastewater Treatment

Abstract

A new inorganic-organic composite dual-coagulant (PAFC-CPAM) was prepared by polyaluminum ferric chloride (PAFC) and cationic polyacrylamide (CPAM) and its treatment efficiency for oily wastewater was evaluated by coagulation jar tests. PAFC-CPAM dual-coagulants were characterized by FT-infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The FTIR spectra illustrated that there were some chemical reactions between PAFC and CPAM in PAFC-CPAM. SEM micrographs testified that PAFC-CPAM formed compact net structure which is different from PAFC and CPAM, resulting to its outstanding coagulation performance other than monomeric coagulant in treating oily wastewater. Coagulation jar tests presented that PAFC-CPAM improved 1.14% and 0.38% of oil removal rate and reduced 0.35NTU and 0.06NTU of residual turbidity than PAFC and CPAM respectively at the optimal dosage of 120mg/L. PAFC-CPAM enhanced 4.56% and 2.12% of oil removal efficiency and decreased 0.27NTU and 0.01NTU of residual turbidity on average in comparison with PAFC and CPAM respectively in the pH range of 4.0-8.0. All of above-mentioned experiment results demonstrated that PAFC-CPAM behaved superior coagulation performance than PAFC and CPAM.

Preparation of a Novel Coal Gangue–Polyacrylamide Hybrid Flocculant and Its Flocculation Performance

“…The intrinsic viscosity measurement was conducted by using an Ubbelohde viscometer after the hybrid flocculant was being dispersed in distilled water at (30 ± 0.02)°C. Flux-times were recorded with an accuracy of ± 0.05 s. Intrinsic viscosity [13] was obtained by extrapolation according to the following formula:…”

“…Various flocculants have been developed for the coagulation and flocculation purposes over the last decades, especially inorganic-based coagulants [4], organic-based flocculants [5] and organic-inorganic hybrid flocculant [6,7]. And the novel hybrid flocculation system has attracted great interest from researchers in recent years [6][7][8][9][10][11][12][13][14][15][16].…”