Performance evaluation and optimization of flocculation process for removing heavy metal
Journal
Chemical Engineering Journal
Journal Volume
385
Date Issued
2020
Author(s)
Abstract
Carboxymethyl chitosan (CMCTS) with active hydroxyl and amino groups is easily modified for chelating and capturing heavy metal, thus showing great potential for application in heavy metal-contaminated wastewater treatment. In this work, a dual-functional MACA copolymer [CMCTS-graft-P(AM-TGA)] with pH resistant was successfully designed and prepared by grafting acrylamide and thioglycolic acid onto CMCTS through UV-initiated graft polymerization. The spectroscopy characterization of functional groups and apparent morphology confirm the successful preparation of MACA. Flocculation conditions for reaching high removal efficiencies and investigating chelation capacity are optimized. A multiobjective evaluation model and a triangular environmental impact, economic benefit, and energy consumption (3E) evaluation model were established and employed to assess the 3E performance of MACA in heavy metal-contaminated wastewater flocculation. Optimal operation modulus is identified using 8 Key performance indicators by 3E triangle model. This work enriches knowledge about flocculation and provides guidance for flocculation parameter control. © 2019 Elsevier B.V.
Subjects
Coagulation; Flocculants; Flocculation; Heavy metal removal; Performance evaluation
Other Subjects
Acrylic monomers; Amides; Benchmarking; Chelation; Coagulation; Energy utilization; Environmental impact; Flocculation; Grafting (chemical); Heavy metals; Ostwald ripening; Wastewater treatment; Carboxymethyl chitosan; Contaminated wastewater; Flocculants; Flocculation process; Heavy metal removal; Key performance indicators; Multi-objective evaluations; Performance evaluation; Chemicals removal (water treatment)
Type
journal article