Large-scale reconstructions led to a significant reduction of harmful emissions into the atmosphere.
In Nizhniye Sergi the conversion of equipment from fuel oil to natural gas has reduced annual emissions of pollutants into the atmosphere by 30%; closing of the open-hearth shop, Mill 750, the foundry area of the foundry and machine shop, fuel oil handling facilities led to a reduction of emissions by 53% in 2005 and by 75% in 2006, while the sulphur dioxide emissions decreased by 48%, carbon monoxide by 54%, NOx by 46%, heavy metals three-fold.
The result of the reconstruction of steelmaking in Revda was the replacement of the outdated open-hearth by a modern EAF method of steel production.
The reconstruction led to a significant reduction of harmful emissions into the atmosphere. At present, all production facilities are equipped with a dust and gas cleaning units, consisting of bag filters with purification efficiency over 99%.
The company conducts a compulsory monitoring of air quality on the boundary of sanitary protection zone according to approved schedules.
In Beryozovsky local treatment facilities (LTC 1, LTC 2) have been constructed, intended to cool the process equipment and to heat-strengthen long products. Following the introduction of LTC-1 closed-loop system in 2007 the Company received a diploma of IX International Symposium “Clear Water of Russia” for its achievements in water treatment technologies and water conservation and was awarded 3rd place in the category “Introduction of technologies 2007".
A "clean” working cycle for furnaces has been introduced to cool the equipment of heating furnaces No.3 and No.4.
Clean water cycle, used to cool the process and electrical equipment, has also been reconstructed.
Dirty water cycle, used to wash out the scale and cool the process equipment, has been upgraded with new high-performance equipment.
The introduction of new closed-loop systems allowed to completely eliminate discharge of industrial waste waters from rolling mills.
Construction of surface waste water treatment plants is under way. The main objective of sewage treatment plants construction is to purify surface run-off to the quality of process water to feed the plant's water recycling systems.
EAF plant in Revda uses fresh process water drawn from Revda water storage reservoir. The water intake is located on the shore of the Revdinsky pond, 300 m above the dam. For the rational use of water resources the Company has 10 water recycling systems (closed loops of the lime-kiln, oxygen compressor plant, and EAF shops 1&2: Dirty water cycle, clean water cycle, chemically treated looped water from ladle-furnace unit and mould, chemically treated looped water of EAF).
Storm water treatment facilities include: primary treatment of drains in stone trap, grates, rain pipe sand; accumulation and ponding in wastewater impounding basin; treatment of waste water with solid phase reagent "Ekozol-401" and flocculant "Praestol 650VS" followed by clarification in the flocculator-settler; aftertreatment of clarified water with a rapid filter; thickening and mechanical de-watering of sludge produced. Treated drains are partially accumulated in impounding basin for further use (preparation of treatment solutions of reagents, washing of sand filter etc.) and through the overflow go into the collector to be discharged into the pond, some treated storm water is used to replenish emergency water.
Effect of waste water discharge No. 1 and No. 2 on the quality of river Revda is monitored at control points below the wastewater discharge area.
Flowmeters with an acoustic integrator such as "Echo-P-02” are used to control wastewater discharge No.1 and No.2.
Environmental protection during storage (disposal) of waste
Treatment of industrial waste is carried out in compliance with the current legislation. The company has developed a waste management standard.
Waste collection is carried out separately by type and hazard classes, then the waste is recycled at the plant (oily rags, sawdust contaminated with oil) or transferred to contracted third parties that have appropriate licenses.
The problem of utilization of metallurgical production waste is solved using the apparatus for processing metallurgical slag to produce a mixture of gravel and crushed stone, widely used for road construction, land reclamation, shore protection of surface water bodies.
The volumes of metallurgical slag processing at the crushing and sorting plant are growing with each passing year. Compared to 2006 the increase in recycling is estimated at 44.3%.