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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

The object of research is the methods of purification of iron-containing wastewater from etching operations, the subject of the study is spent technological solutions of etching and wastewater from the operations of washing enterprises of hardware products. Spent etching solutions are characterized as highly concentrated solutions, and wash water belongs to the category of concentrated solutions containing toxic impurities: heavy metal ions, acids, surfactants. The main problem in the etching area is the processing of used etching solutions. The most progressive creation of combined systems in which the bulk of wastewater is treated in centralized systems with partial return of water to the production process. With such wastewater treatment, the problem arises of reducing the total concentration of iron to less than 1 mg/l. That is why, in accordance with the requirements of environmental legislation on nature management, there is a need for deep additional treatment of such wastewater. The study used the methods of potentiometric titration and chemical deposition, as well as the method of photometric determination. Magnetic cleaning was studied in an experimental magnetic deposition apparatus. The paper presents the results of studies evaluating methods for purifying iron-containing wastewater from etching operations. Improvement is achieved by the creation of technological combined schemes for the purification of iron-containing wastewater, including a magnetic device as an auxiliary element. At the same time, the main volume of wastewater is treated in centralized systems with a partial return of water to the production process. Waste solutions from etching operations are subject to regeneration with return to the production process and partial dosage into the main wastewater stream from washing operations. Deep purification from iron-containing impurities using a magnetic device expands the possibilities of practical implementation of reverse osmosis to obtain «clean» water in centralized systems. This water is applicable for the preparation of process solutions and mixed with industrial water for flushing operations.

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Анотація. Технологія вилучення йоду з супутньої води на ділянках видобутку нафти та технологічні параметри були проаналізовані за допомогою системного аналізу існуючих технологій. Доведено, що оцінку окисно-відновної рівноваги системи в технологіях вилучення йоду за значенням Eh та rH2 можна проводити лише при однакових значеннях рН Встановлені оптимальні параметри (pH, Eh, rH2) на кожному етапі технологічного процесу із застосуванням потенціометричного методу аналізу, що дозволяє знизити собівартість кінцевого продукту. Високий ефект екстракції йоду отриманий за рахунок усунення побічних процесів.Ключові слова: екстракція, системний аналіз, окиснення, електроліз, H-індекс, окисно-відновний потенціал.Improvement of the technology of extracting iodine from water systems N. M. Korchyk, N. M. Bydenkova, O. A. Prorok Abstract. Iodine extraction technology out of accompanying water in oil extraction sites as well as various leaches being analyze by means of system analysis. There were established optimal parameters (pH, Eh, rH2) for every stage of technological process based on potentiometric method of analysis. They decrease the cost of the final product. High iodine extraction effect gained due to elimination of side processes. The technology of iodine extracting from contiguous water at oil extraction sites and technological parameters being analyze using a system analysis of existing technologies. It has proved that the evaluation of the oxidation-reduction equilibrium of the system in iodine extraction technologies by the values of Eh and rH2 could been carried out only with the same pH values. The optimum parameters (pH, Eh, rH2) have been establishing at each stage of the technological process using the potentiometric method of analysis, which decrease the cost of the final product. High iodine extraction effect gained due to elimination of side processes.