title: Advanced lignin-acrylamide water treatment agent by pulp and paper industrial sludge: synthesis, properties and application.
abstract: A novel flocculant LA (lignin-acrylamide polymer), which was used as aid for aluminum sulfate and polyaluminum chloride in this study, was prepared by grafting acrylamide onto lignin that deriving from pulp and papermaking sludge. Physicochemical properties of LA were measured by X-ray photoelectron spectroscopy and scanning electron microscopy. The experimental outcome indicated acrylamide was grafted onto the lignin backbone successfully. The effects of LA addition were evaluated on coagulation performance and floc characteristics as a function of aluminum (Al) dosage, such as floc size, growth rate, strength and recoverability. Effects of different dosing sequences, Al dosed first and LA dosed first, were also investigated. LA used as coagulant aid markedly enhanced the removal efficiency of turbidity and dissolved organic carbon, especially at low Al dosages. The dissolved organic carbon removal efficiencies of aluminum sulfate and polyaluminum chloride at the Al dosage range selected in this study were improved more than 30% and 5% by LA, respectively. LA dramatically enlarged floc size and it was in the order: Al dosed first > LA dosed first > Al. Floc strength and recoverability were also improved by LA. LA played a significant role in charge neutralization, adsorption and bridging in floc formation.
authors.forename: Hongyan
authors.initials: H
authors.lastname: Rong
authors.forename: Baoyu
authors.initials: B
authors.lastname: Gao
authors.forename: Yanxia
authors.initials: Y
authors.lastname: Zhao
authors.forename: Shenglei
authors.initials: S
authors.lastname: Sun
authors.forename: Zhonglian
authors.initials: Z
authors.lastname: Yang
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
authors.forename: Qinyan
authors.initials: Q
authors.lastname: Yue
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
mesh_terms: D000178:Acrylamides / Q000138:chemical synthesis* / Q000737:chemistry; D000534:Alum Compounds / Q000737:chemistry; D000536:Aluminum Hydroxide / Q000737:chemistry; D005427:Flocculation; D007220:Industrial Waste; D008031:Lignin / Q000138:chemical synthesis* / Q000737:chemistry; D010209:Paper; D018508:Water Purification
chemical_list: D000178:Acrylamides; D000534:Alum Compounds; D007220:Industrial Waste; C016213:aluminum oxychloride; C041524:aluminum sulfate; D000536:Aluminum Hydroxide; D008031:Lignin