Application of cationic hemicelluloses produced from corn husk as polyelectrolytes in sewage treatment

Abstract

Hemicelluloses were extracted from corn husk and converted into cationic hemicelluloses using 2,3-epoxypropyltrimethylammonium chloride. The degree of substitution was determined as 0.43 from results of elemental analysis. The cationic derivative was also characterized by Fourier transform infrared spectroscopy and Carbon-13 magnetic nuclear ressonance. The produced polymer was employed as coagulant aid in a sewage treatment station (STS) of the municipal department of water and sewer (Departamento Municipal de Água e Esgoto -DMAE) in Uberlândia-Minas Gerais, Brazil, using Jar test experiments. Its performance was compared to ACRIPOL C10  , a commercial cationic polyacrylamide regularly used as a coagulant at the STS. The best result of the jar-test essays was obtained when using cationic hemicelluloses (10 mg L -1 ) as coagulant aid and ferric chloride as coagulante (200 mg L -1 ). The resultsof color and turbidity reduction, 37 and 39%, respectively, were better than when using only ferric chloride. These results were also higher than those of commercial polyacrylamide, on the order of 32.4 and 38.7%, respectively. The results showed that the cationic hemicelluloses presented similar or even superior performance when compared to ACRIPOL C10  , demonstrating that the polyelectrolytes produced from recycled corn husks can replace commercial polymers in sewage treatment stations.

Surface Activity and Foaming Capacity of Aggregates Formed between an Anionic Surfactant and Non-Cellulosics Leached from Wood Fibers

“…These characteristic peaks correspond to the O–H (3355 cm –1 ) and the C–O (1040 cm –1 ) bond stretching of the ether groups and the β-1,4 glycosidic bond stretching (897 cm –1 ). 42 Additionally, the peak at 1215 cm –1 is assigned to the stretching of skeletal vibration of S–O in SDS, 43 which is found in the spectra of neat SDS and Leachate 0.7mM SDS . The ATR–FT-IR results confirm the presence of hemicelluloses in Leachate MQ and Leachate 0.7mM SDS .…”

“…The absorbances of Leachate MQ and Leachate 0.7mM SDS at 3355, 1040, and 897 cm –1 (Figure a–c) are assigned to hemicelluloses. These characteristic peaks correspond to the O–H (3355 cm –1 ) and the C–O (1040 cm –1 ) bond stretching of the ether groups and the β-1,4 glycosidic bond stretching (897 cm –1 ) . Additionally, the peak at 1215 cm –1 is assigned to the stretching of skeletal vibration of S–O in SDS, which is found in the spectra of neat SDS and Leachate 0.7mM SDS .…”

Feasibility of Coagulation-Flocculation Followed by Mango Seed Filtration for Treatment of Swine Industry Effluent

“…It is believed that this is due to two factors: 1) because the polymer used has positive and negative ionizable sites, the neutralization of colloidal, suspended and dissolved particles present in the effluent is favored; 2) due to the fact that according to Bernardo and Dantas (2005), descending filters with fast action have depth action, where the particles are retained along the filter medium, thus a higher filter could indicate a greater efficiency in the treatment. In this sense, the polymer presents itself as a potential primary coagulant for the treatment of different effluents, since polymers are usually used and studied as auxiliaries in the coagulation process (RODRIGUES FILHO et al, 2013;LIMA, 2007).…”

Pilot-scale biorefinery of agri-food residual biomass oriented to valuable bioproducts

“…In both pharmaceutical and cosmetic industry, hemicelluloses can be used as hydrogels (Gabrielii et ). New biopolymers from modified hemicelluloses have been obtained, for example thermoplastic hemicellulose derivatives (Jacobs et al, 2003), long-chain alkyl ester derivatives (Laine et al, 2010;Sun et al, 1999Sun et al, , 2001, hydrophobized hemicelluloses (Farhat et al, 2017) and cationic biopolymers (Ebringerová et al, 1994;R. Filho et al, 2013).…”