Automatic control of the local rinse water treatment facilities

Summary

On the basis of the system analysis of the operation of local rinse water treatment facilities of the steel band dip galvanizing line the structure of a process unit as a controlled object was developed. The vectors of the output coordinates of control and disturbing actions are defined It is shown that the controlled object is multi-dimensional, unsteady and has an unstable structure. The results of the study were used in designing and introducing an automatic control system of the local rinse water treatment facilities.

Key words

mathematic modelling , galvanic production , treatment facilities , controlled object , object structure

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UDC 628.32:628.336.321

Strelkov A. K., Kichigin V. I., Tsypin A. V.

Local Treatment of Industrial Wastewater of the Samara Tank Factory Before Discharge into City Sewerage

Summary

A flow chart of local treatment of wash water of a hot metal galvanizing line making it possible to reuse them in production is proposed. It is established that in the course of waste water treatment according to the flow chart proposed the salt content in wash water does not increase and the total volume of water consumption and wastewater disposal of the factory is reduced. A possibility of using the filter-press for water clarification at reagent treatment is proved. The technology of reverse osmosis is used for organization of recirculating water supply.

Key words

filter-press , wash water , galvanic production , reverse osmosis unit , recirculating water supply

DOI 10.35776/VST.2021.01.07
UDC 628.316.12:621.357

Ainetdinov Ravil’, Vasil’ev Aleksei, Kuznetsova Alla

Local facilities for plating wastewater treatment

Summary

The analysis of the operation of the existing facilities for plating wastewater treatment is presented. The results of the upgrade of structures and introduction of a system for reusing plating wastes after treatment are presented. The work was carried out at an operating enterprise in the automotive industry. The designer was given the task of providing for the tertiary treatment of effluents that had passed processing at the neutralization plant in order to return the effluent to the main process cycle. The implementation of the project for designing a system for effluent reusing ensured meeting the regulated indicators of process water for the washing operations of an industrial plating plant.

Key words

recirculated water system , ion exchange , galvanic production , industrial wastewater treatment , physical and chemical methods of treatment

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UDC 628.316.12:546.72

Filatova E. G., Pomazkina O. I., Dudarev V. I., Soboleva A. A.

Removing iron with carbon sorbent from plating wastes

Summary

The results of investigating adsorption capacity of sorbents in relation to iron ions (III) under static and dynamic conditions (with the use of isotherms and kinetic adsorption curves) are presented. To provide for removal of iron ions (III) and tertiary treatment of plating wastes IPI-T activated carbon was used that was produced from the wastes of phenol-formaldehyde resin production and modified with sulfosalicylic acid for IPI-Tm sorbent production was used. The maximum rate of sorbate passing through the sorbent layer was 5–7.5 ml/min which corresponded to the linear velocity of 1.5–2 m/h under full-scale conditions. The main factor that affects the sorption process is pH with optimal value of 1.79. Constants of BET adsorption equation for IPI-Tm modified sorbent were determined. The limiting sorption capacity of the monolayer was 128 mmol/kg, for IPI-T sorbent – 20.8 mmol/kg, limiting adsorption А∞ – 100 mmol/kg, adsorption equilibrium constant – 1·104; at that standard Gibbs energy of adsorption was 22.819 kJ/mol. Under dynamic conditions the time of the protective effect of IPI-Tm sorbent was 4 hours, i. e. 2 hours longer compared to IPI-T sorbent, and the volume capacity for IPI-Tm was 7.2 mg/l, i. e. twice as high as that for IPI-T.

Key words

wastewater , carbonic sorbent , adsorption , galvanic production , iron ions (III) , isotherm , kinetic curve

UDC 628.316.12
DOI 10.35776/VST.2023.11.05

Stepanov S. V., Panfilova O. N., Doubman I. S.

Results of studying the removal of heavy metal ions from industrial wastewater

Summary

The results of studies on the removal of heavy metal ions from acid-base wastewater of electroplating industry by neutralization, sedimentation and filtration are presented. During a laboratory experiment carried out with processing real acid-base wastewater of one of the enterprises in Samara with caustic soda, the optimal pH range found was 9.8–10.6. Using a flow through model of a vertical settling tank, the calculated hydraulic size of the suspension generated during the alkalization of the given wastewater category was determined that can be taken as 0.28 mm/s. The level of heavy metal ion removal in the process of galvanic wastewater treatment according to the flow scheme «pH adjustment – settling tank – filter with granular media» was experimentally determined in mg/l as: total iron 0.42–0.97; copper 0.028–0.087; nickel 0.016–0.073; zinc 0.047–0.28; cadmium 0.006–0.016. At the same time, the requirements for receiving industrial effluents into the Samara municipal sewer were met only for iron; whereas, the concentrations of other metals ranged from 0.85 to 13.3 shares of the permissible concentrations; therefore, in order to achieve the established standards, additional treatment was required, for example, by sorption.

Key words

wastewater , hydraulic size , filtration , galvanic production , heavy metal ions , neutralization

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