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The problems in processing the acid ferrous-containing rinsing water and spent pickling solutions are considered. The first-ever in metallurgy zero liquid discharge (ZLD) industrial wastewater treatment systems of a transformer cold rolling plant at the Verkh-Isetsky steelworks in Sverdlovsk (now — LLC VIZ Steel is a part of Novolipetsk Steel Group of Companies) is described. The experience of the VIZ Steel, particularly in relation to industrial wastewater treatment and sludge processing, is useful for designing ZLD industrial wastewater treatment systems of metallurgical, machine-building and metalworking enterprises. The recommendations for organizing the ZLD industrial wastewater treatment systems in the pickling plants with the repeated use of the treated rinsing water and processing the spent pickling solutions and the sludges are presented. For practical calculations of clarifiers the empirical formulas are offered. Process flow diagram of acid ferrous-containing rinsing water treatment is suggested. Acid ferrous-containing rinsing water treatment includes the following processes: rinsing water neutralization to pH 9-10,5 by 5 % calcium hydroxide and partial ferrous oxidation by air; addition of anionic flocculant and active gypsum priming to the neutralized rinsing water; settling of rinsing water conditioned by reagents in clarifiers; treatment of clarified water on deep bed sand filters; reclaimed water treatment.

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After the changes to the Federal law “On environment protection” came into force, the plants having considerable negative impact on environment, including plants of steel industry and non-ferrous metallurgy, from January 1, 2019 have to proceed to implementation of best available technologies. Among the problems, the information and analytical provision of such technologies implementation noticed. Formulation of “complex ecological permission” and “best available technology” (“BAT”) meanings considered. Items of registration considered, including order and terms, specified for BAT receiving, which substitutes the permission for emission of contaminants intoatmosphere, limits for contaminants emission, permission for contaminants discharge into environment, limits for contaminants discharge, norms for wastes formation and limits for their allocation. A list of supporting actions at implementation of measures on environment protection quoted, including state support ofactivity on BAT implementation and other measures decreasing negative impact on environment. Bureau of BAT elaborated information and technical reference books on BATs, which are available at internet-site http://burondt.ru/index/its-ndt.html. For steel industry and related industries list of the reference books on BATs recommended for familiarization. A reference to an electron resource, containing “List of main technological equipment, used at implementation of best available technologies” quoted. The document approved by the RF Government’ decree. Problems considered, related to BAT implementation, including absence of approved technological indices of BAT and incompleteness of list of equipment recommended for implementation.