Abstract
The aim of the research is to improve the technological scheme of treatment of iron-containing wastewater from etching operations by creating combined systems, including reagent wastewater treatment, their mutual neutralization, regeneration of etching solutions, deep post-treatment using a magnetic device. The main volume of wastewater is treated in centralized systems with partial return of water to the production process. Spent solutions from etching operations are subject to regeneration with return to the production process and partial dosing into the main wastewater stream from flushing operations. The consumption of commercial HCl is reduced by 50%. The use of hydrogen peroxide can increase the effect of extracting iron from etching solutions by 30% (total purification effect of 70%). Given that deep purification from iron-containing impurities is provided using a magnetic device, the possibilities of practical implementation of reverse osmosis to obtain "pure" water in centralized systems, which can be used for preparation of process solutions and in a mixture with technical water - for flushing operations, increase. In experimental and industrial conditions the expenses of reagents, their concentrations, dosing time are established
Highlights
Etching of steel surfaces involves treatment with acid solutions (HCl, H2SO4) at elevated temperatures, resulting in the formation of liquid iron-containing waste – wastewater (WW): spent etching solutions (SES), which are characterized as highly concentrated solutions, and washing water (WasW), which belong to the category of concentrated solutions [1].The main problem of the etching area is the processing of SES, for this purpose local cycles of their disposal, utilization, regeneration are created [2]
(2021), «EUREKA: Life Sciences» Number 3 and, as a consequence, provides an increase in the overall efficiency and degree of wastewater treatment [6]. In this technological solution we propose to implement deep purification of wastewater from the etching area from iron-containing impurities using a magnetic device, followed by desalination by reverse osmosis
The use of an electromagnetic device will provide deep purification of wastewater from iron ions, which is very important for further desalination by reverse osmosis [7] and allows to solve the problem of returning washing water to production processes
Summary
Etching of steel surfaces involves treatment with acid solutions (HCl, H2SO4) at elevated temperatures, resulting in the formation of liquid iron-containing waste – wastewater (WW): spent etching solutions (SES), which are characterized as highly concentrated solutions, and washing water (WasW), which belong to the category of concentrated solutions [1]. The results of research on the technology of magnetic-electric wastewater treatment, conducted earlier, allowed to develop a device that creates a high-gradient magnetic field in the working zone of deposition in combination with a branched filtration surface This increases the force on electrically charged impurities, especially with a low specific electric charge (2021), «EUREKA: Life Sciences» Number 3 and, as a consequence, provides an increase in the overall efficiency and degree of wastewater treatment [6]. In this technological solution we propose to implement deep purification of wastewater from the etching area from iron-containing impurities using a magnetic device, followed by desalination by reverse osmosis. The total flow of wastewater together with technological solutions from the operations of etching and degreasing after their mutual neutralization in the local cycle enters the centralized treatment system, which operates semi-continuously
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