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UDC 628.345.1.001.2
Getmantsev S. V., Gandurina L. V., Sychev A. V.
Research in Coagulation Properties of AQUA-AURAT™18and Aluminium Sulphate at Independent and Combined Application
Summary
Results of the experimental studies on coagulation of pollutants of various types (suspended substances, dyes and humic substances) with coagulant AQUA-AURAT™18 and aluminium sulphate at combined application depending on their ratio and order of insertion in comparison with composite coagulant AQUA-AURAT™105 are presented. It is shown, that the combined use of aluminium sulphate and AQUA-AURAT™18 at consecutive insertion or in the form of composition intensifies the process of water treatment for suspended and dissolved acid substances (humates and acid dyes) comparing with the independent use of coagulants at a lesser or equal dose. The composite coagulant AQUA-AURAT™105 is more efficient for removal of suspended substances from wastewater than dissolved organic pollutants of acid type.
Key words
suspended substances , coagulation , coagulant , water treatment , humic substances , dye
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UDC 628.161.2:544.77.052.5:628.16.094.3-926.214
DOI 10.35776/VST.2023.02.07
Pilipenko Marina, Dubina Aleksandr, Likhavitskii Vitalii
Combining ultrasonic treatment and ozonation for wastewater treatment of dyeing plants
Summary
The results of studying the efficiency of purification of model and real wastewater from dyeing and finishing works by combining ultrasonic treatment and ozonation are presented. The effect of the treatment time, ozone concentration in the gas mixture on the purification efficiency has been studied. The purification efficiency was evaluated by optical density and COD. As a result of the study up to 12% increase in the efficiency of wastewater treatment was shown while combining flotation with ozone-air mixture instead of air with ultrasonic treatment. This effect can be associated, first of all, with the dispersion of ozone-air mixture bubbles that results in an increase in the surface area, and, accordingly, in an increase in the kinetics of mass transfer – ozone dissolution.
Key words
flotation , wastewater , dye , ozone , fabric dyeing
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DOI 10.35776/VST.2022.06.08
УДК 544.526:628.169
Pilipenko Marina
Comparative analysis of photocatalysts from de-ironing plant wastes
Summary
The results of the synthesis of photocatalysts prepared from de-ironing plant wastes are presented. To improve the efficiency, iron-containing materials were doped with zinc, molybdenum, and lanthanum. For the synthesis, the method of solution combustion synthesis was chosen. Urea, citric acid and glycine in stoichiometric ratio were taken as reducing agents. The obtained samples were studied by X-ray phase analysis. The efficiency of the obtained materials was studied in the process of photocatalytic destruction of four dyes of different origin. Based on the results of the work, the optimal compositions and reducing agents used for their synthesis were determined.
Key words
wastewater , dye , photocatalyst , de-ironing plant wastes , exothermic combustion in solution
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DOI 10.35776/VST.2023.01.06
UDC 544.526:628.169
Pilipenko Marina, Dubina Aleksandr, Likhavitskii Vitalii
Flotation of wastewater from dye works using ozone
Summary
The results of experimental studies of the efficiency of purification of model and real wastewater from dye and finishing works with the aid of pneumatic flotation using ozone-air mixture instead of air are presented. The effect of the gas mixture flow rate, dye concentration, and ozone concentration in the gas mixture on the purification efficiency was studied. The purification efficiency was evaluated by optical density and COD. While using ozone-air mixture instead of air, a 12-fold efficiency increase was achieved. The results of the studies have shown that while using ozone flotation to achieve the purification efficiency of 90% of the real wastewater from dye and finishing works, abstracted upstream the treatment facilities (electrocoagulation followed by flotation), the following conditions are required: processing time not less than 60 minutes; consumption of ozone-air mixture not less than 5 l/(l·min); ozone concentration in the ozone-air mixture not less than 8 g/m3.
Key words
wastewater , flotation , dye , ozone , fabric dyeing
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