ISSN 1995-4301
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ISSN 2618-8406
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Purification of model waters from aluminum ions by wastewater from the soda pulping of cellulose from the shells of cereals

S.V. Stepanova, A.A. Alekseeva
Section: Ecologization of industry
Aluminum ions contained in water do not belong to substances with a pronounced toxic effect. Solutions of aluminum salts are highly stable, but with gradual accumulation in human and animal organisms have a harmful effect, especially in the presence of dysfunctions of the excretory system. Therefore, the problem of industrial wastewater treatment and water treatment for technical and drinking purposes is becoming more and more important every year. The authors have studied the possibility of using alkaline wastewater formed while obtaining cellulose from agricultural waste (shells of wheat, oats, and barley) by the natron method as flocculant reagents for wastewater treatment from contamination with aluminum ions. The pH values at which the most complete deposition of aluminum hydroxocomplexes occurs are determined: when using alkaline wastewater, the pH is 6.0, and for a NaOH solution, the pH is 5.0. An increase in the precipitation rate of particles formed during the purification of model waters from aluminum ions with alkaline reagents from waste cereals and the enlargement of the resulting floccules by 35% is shown. It was determined that the efficiency of removing aluminum ions from the model water from the proposed reagents is not inferior to traditional alkaline wastewater from the production of cellulose from oat husks (at low concentrations of aluminum ions it is 20% higher). Water purification occurs due to the interaction of Al3+ ions with the functional groups of lignin and cellulose, pentosans, and other polysaccharides, as well as unreacted NaOH, which gives alkalinity to reagents from waste cereals.
Keywords: aluminum ions, alkaline wastewater, flocculation refinery

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Article published in number 1 for 2022
DOI: 10.25750/1995-4301-2022-1-124-128
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