Comparative study of humic acids flocculation with chitosan hydrochloride and chitosan glutamate

Bratskaya, Svetlana; Schwarz, Simona; Chervonetsky, Denis

doi:10.1016/j.watres.2004.03.033

Cited by 111 publications

(61 citation statements)

References 21 publications

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“…Increasing demand for environmentally friendly technologies promotes the interest to natural polyelectrolytes where chitosan being the most promising cationic biopolymer for extensive application [13][14][15]. Chitosan is a polycationic biodegradable non-toxic high molecular weight linear copolymer of glucosamine and N-acetyl glucosamine, with a high charge density in the acidic to neutral solutions and it can be used as an eco-friendly coagulant/flocculant hybrid.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of chitosans for the treatment of papermaking process water by dissolved air flotation

Miranda

Nicu

Latour

et al. 2013

Chemical Engineering Journal

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Interest has grown in bio-polymers as being environmental friendly alternatives to synthetic additives. In this work, two native chitosans with different molecular weights have been evaluated on a laboratory scale for their effectiveness for the removal of contaminants from papermaking process waters by dissolved air flotation (DAF). The use of chitosan quaternary derivatives and the use of the native chitosans in combination with anionic bentonite microparticles have also been tested. Results demonstrate a high efficiency of the native chitosan products at intermediate dosages and furthermore, their efficiency is enhanced by the combined addition of bentonite. For an equivalent removal of contaminants, the required dosage of chitosan is about half that the dosage required in absence of bentonite. Quaternary derivatives have not improved the efficiency of the native chitosan in this case. The optimum treatment would be 50 mg/L of native chitosan and 100 mg/L of bentonite where this treatment is capable of the removal of 83-89% turbidity (residual turbidity 210-320 NTU), 68-71% dissolved turbidity (residual dissolved turbidity of 22-24 NTU), 18-22% total solids (residual total solids of 2750-2900 mg/L) and 19-23% COD (1440-1525 mg/L). The low molecular weight native chitosan is more efficient than the medium molecular weight chitosan in all cases. The Focused Beam Reflectance Measurement (FBRM) is used to assess the aggregation process and to predict the separation efficiency of DAF units either with single or dual systems. The efficiency predicted through the FBRM technique is very similar to that obtained later in the DAF tests.

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Section: Introductionmentioning

confidence: 99%

Efficiency of chitosans for the treatment of papermaking process water by dissolved air flotation

Miranda

Nicu

Latour

et al. 2013

Chemical Engineering Journal

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“…The FTIR (Perkin-Elmer) spectrum indicated that the chitosan was deacetylated to 63 % proving transformation of chitin into chitosan as chitin with more than 50 % DD is referred to as chitosan (Bratskaya et al 2004). The degree of deacetylation was determined to find out the extent to which the acetyl groups have been removed.…”

Section: Resultsmentioning

confidence: 99%

A comparative study of sorption of chromium (III) onto chitin and chitosan

Singh

Nagendran²

2014

Appl Water Sci

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Heavy metals have always been the most hazardous components in the wastewater of industries like electroplating, automobiles, mining facilities and fertilizer manufacturers. Treatment of heavy metal laden wastewater requires expensive operational and maintenance systems. Food processing industries create a huge amount of shell waste which is sold to poultry farms in powdered form but the quantity thus used is still not comparable to the left over waste. The shell contains chitin which acts as an adsorbent for the heavy metals and can be used to treat heavy metal wastewater. The paper presents a study on the use of chitin and its processed product, chitosan, to remove chromium. Shake flask experiment was conducted to compare the adsorptive capacity of chitin and chitosan for chromium removal from simulated solution and isotherm studies were carried out. The studies showed that the chitosan was a better adsorbent than chitin. Both chitin and chitosan gave best adsorption results at pH 3. Chitin exhibited maximum chromium removal of 49.98 % in 20 min, whereas chitosan showed 50 % removal efficiency at a contact time of 20 min showing higher adsorptive capacity for chromium than chitin. The Langmiur and Freundlich isotherm studies showed very good adsorption capacity and monolayer interaction according to the regression coefficient 0.973 for chitosan and 0.915 for chitin. The regression coefficient for Freundlich isotherm was 0.894 and 0.831 for chitosan and chitin, respectively.

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“…Environmentally sustainable alternatives to these polymers, based on natural polymers, are of growing interest (RojasReyna et al 2010;Thakur et al 2015;Thakur and Voicu 2016). Bio-based papermaking additives are produced from a variety of sources, and some of the most notable materials are chitosan, starch, phosphate-modified glucomannan, and natural polysaccharides grafted with acrylamide (Bratskaya et al 2004;Kuutti et al 2011). Among them, chitosan is probably the most promising cationic biopolymer for extensive application in flocculation applications (Bratskaya et al 2004).…”

Section: Introductionmentioning

confidence: 99%

“…It also has a unique set of properties such as natural cationic charge density, biodegradability, biocompatibility, non-toxicity, and antimicrobial activity (Crini and Badot 2008;Renault et al 2009;Thakur and Thakur 2014). These specific properties make it suitable for a large range of applications, including coagulationflocculation processes (Bratskaya et al 2004;Renault et al 2009;Zemmouri et al 2011;Miranda et al 2013;Yang et al 2016). The most relevant characteristics of chitosan in relation to flocculation are charge density (related to its deacetylation degree), molecular weight, and molecular structure (Renault et al 2009;Thakur and Thakur 2014).…”

Section: Introductionmentioning

confidence: 99%

Efficiency of Chitosan and their Combination with Bentonite as Retention Aids in Papermaking

Miranda¹,

Nicu²,

Bobu³

et al. 2016

BioResources

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In a previous work , the flocculation efficiency of three chitosans differing by molecular weight and charge density were evaluated for their potential use as wet end additives in papermaking. According to the promising results obtained, chitosan (single system) and its combination with bentonite (dual system) were evaluated as retention aids, and their efficiency was compared with poly(diallyl dimethyl ammonium chloride) (PDADMAC) and polyethylenimine (PEI). In single systems, chitosan was clearly more efficient in drainage rate than PDADMAC and PEI, especially those with the lowest molecular weights; however, retention is considerably lower. This drawback can be overcome by using dual systems with anionic bentonite microparticles, with the optimum ratio of polymer:bentonite being 1:4 (wt./wt.). In dual systems, the differences in retention were almost negligible, and the difference in drainage rate was even higher, together with better floc reversibility. The most efficient chitosan in single systems was Ch.MMW, while Ch.LMW was the most efficient in dual systems. The flocculation mechanism of chitosan was a combination of patch formation, charge neutralization, and partial bridge formation, and the predominant mechanism depended on the molecular weight and charge density of the chitosan.

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Comparative study of humic acids flocculation with chitosan hydrochloride and chitosan glutamate

Cited by 111 publications

References 21 publications

Efficiency of chitosans for the treatment of papermaking process water by dissolved air flotation

Efficiency of chitosans for the treatment of papermaking process water by dissolved air flotation

A comparative study of sorption of chromium (III) onto chitin and chitosan

Efficiency of Chitosan and their Combination with Bentonite as Retention Aids in Papermaking

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