A novel acrylamide-free flocculant and its application for sludge dewatering

In the present research, copolymers of methyl acrylate (MA) with anionic or cationic monomers were synthesized via emulsion polymerization, and used as sludge dewatering aids in wastewater treatment. The copolymerization of different stoichiometry of two monomers afforded a variety of water soluble...

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Bibliographic Details
Published in:Water research (Oxford) 2014-06, Vol.57, p.304-312
Main Authors: Lu, Lianghua, Pan, Zhida, Hao, Nan, Peng, Wenqing
Format: Article
Language:English
Subjects:
Acrylates
Acrylates - chemistry
Acrylic Resins - chemistry
Anions - chemistry
Applied sciences
Cationic
Cations - chemistry
Charge density
Copolymers
Dewatering
Exact sciences and technology
Flocculation
General purification processes
Monomers
Organic polymers
Physicochemistry of polymers
Pollution
Polymerization
Properties and characterization
Sewage - chemistry
Sludge
Solution and gel properties
Waste Disposal, Fluid - methods
Wastewater treatment
Wastewaters
Water treatment and pollution
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Summary:In the present research, copolymers of methyl acrylate (MA) with anionic or cationic monomers were synthesized via emulsion polymerization, and used as sludge dewatering aids in wastewater treatment. The copolymerization of different stoichiometry of two monomers afforded a variety of water soluble copolymers with charge densities ranging from 40% to 80%, which align with the charge density of current flocculant products. These copolymers resemble current commercial products, but provide a greener solution by eliminating acrylamide monomer, which is a suspected carcinogen. High molecular weight copolymers were achieved by applying powder-like synthesis process with intrinsic viscosity of final products as high as 12.98 dl/g for anionic flocculant and 10.74 dl/g for cationic flocculant. The copolymers of methyl acrylate and [2-(Acryloyloxy)ethyl]trimethylammonium chloride (AETAC) with 55% charge density exhibited comparable performance in clay settling test, real water jar test, and sludge dewatering, when compared to AM-based commercial product in the real wastewater treatment application.
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2014.03.047