Study on Flocculation Performance of New Cationic Starch‐Based Sludge Wastewater Flocculant

Abstract

From the perspective of ecological environment and human health, efficient and easily biodegradable starch-based flocculants for replacing the currently used polyacrylamide (PAM) and cationic PAM (CPAM) flocculants are the future development trend. In this paper, starch graft polymerization of acrylamide-allyl trimethyl ammonium chloride (St-g-ATMAC) is prepared by grafting and copolymerizing acrylamide and the short-chain quaternary ammonium cationic monomer ATMAC onto the molecular chain of soluble starch. Compared with PAM and CPAM, this flocculant has a lower water content in the filter cake after treating wastewater, making the subsequent treatment easier. Moreover, the flocculant is resistant to high temperature. Specifically, at 40 °C, the filter cake moisture content (FCMC) is still lower than those of PAM and CPAM. Furthermore, the flocculant is resistant to acid and alkali. In the over-acidic and over-alkaline environment after treatment, the FCMC remains lower than that of the PAM-and CPAM-treated mud cake. In summary, St-g-ATMAC is a new type of water treatment flocculant that can effectively treat wastewater with low dosage, wide temperature, and pH range and has the potential to be widely used in water treatment.

Emerging environmentally friendly bio-based nanocomposites for the efficient removal of dyes and micropollutants from wastewater by adsorption: a comprehensive review

“…By reacting starch with (3-chloro-2-hydroxypropyl trimethyl) ammonium chloride, cationic starch-containing ammonium groups were formed, which were then used to make starch-based nanocomposites for cationic dyes adsorption. 77 The produced quaternary starch has the ability to absorb the nitrate group from wastewater with a maximum adsorption capacity of 205 mg g −1 . This effect was sustained at 78.5% after eight sorption–desorption cycles.…”

Production of Cationic Starch-Based Flocculants and Their Application in Thickening and Dewatering of the Municipal Sewage Sludge

“…The specific resistance to filtration and capillary suction time of the sludge using starch-g-p(DMDAAC) decreased, and the sludge water content could be reduced from 98% to 51%. In another paper [ 15 ], the graft copolymers of acrylamide and allyl trimethyl ammonium chloride using soluble starch were prepared. The obtained copolymers were suggested as new flocculants for wastewater treatment due to their low dose and effectiveness in a wide temperature and pH range.…”

Study on the matching rules and control mechanisms between flocculants and slurry settlement characteristics

“…High water content sediment indicates that water is not fully removed from the slurry, and the poor physical and mechanical properties of the sediment hinder the recycling. Excess flocculant will reduce the slurry flocculation rate and generate high alkaline sediment, which will have a more adverse effect on the slurry dewatering effect and sediment recycling [9][10][11][12][13].…”