Wastewater from steel and iron works, where the smelting of pig iron in blast furnaces and of steel in open hearth furnaces takes place, contains a considerable amount of oil, dust, acid, iron, and other metals. Blast furnace gas is treated by water spraying to remove dust. This wastewater contains cyanides, sulfur compounds, phenol, dust, metal ions, ashes, slags, and more particles. Rolling mills produce wastewater during the cooling of bearings and shafts. The water consumption is about 10 m3/ton, but by recirculation it is possible to reduce this amount of water by a factor of two to seven. Wastewater from the steel and iron industry can contain up to 5% of grease and oil when recirculation of the wastewater takes place. On the coke plant side, recycled scrubber water is used as a coolant. Scrubber waste streams contain tars, organic matter, sulfides, cyanides, inorganic salts, suspended solids, phenols, and ammonia. Treatment of this wastewater involves removal of suspended solids and chemicals that are toxic to biological systems, followed by biological treatment.
Water treatment solutions from akvola Technologies help industrial steel and iron processing plants to manage environmental impact, produce higher grade final products, and reduce cost of production through better water and wastewater management.
Important benefits for the metallurgical industry in working with us:
– Recycle challenging wastewater streams (i.e. sandfilter backwash) for use in production processes
– Reduced raw water intake
– Reliably meet wastewater discharge limits