Metallurgy

Turn Wastewater Into Value
akvoFloat™ can handle any effluent in the metallurgical industry –regardless of the oil and TSS concentration– as a one-stop pretreatment solution for the reuse and discharge of challenging effluents, acting as a reliable absolute barrier. Unlike conventional technologies, akvoFloat™ can remove dispersed and emulsified oils.

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

COKE PLANT SCRUBBER

Problem: Scrubber water contains small coal-tar and other 
organic particles (1-250 micron) that cause scaling in the pipes 
and trays of the adsorption/desorption tower, which have to be replaces every 2-3 years

Solution: Total removal of particles down to 1 micron in order to avoid unplanned maintenance works

COLD MILLS - RINSING

Problem: salt stains in pickling and finishing

Solution: reduce fouling and depositions

COLD MILLS - WASTEWATER HANDLING

Problem: ineffective oils and metals removal

Solution: enhance oils removal and metals elimination

WASTEWATER TREATMENT PLANT

Problem: ineffective removal of oils, solids, organics and metals to meet discharge limits or RO feed quality

Solution: use membrane pretreatment to achieve high and constant water quality

HOT MILL - DESCALING

Problem: poor descale water quality

Solution: improve removal of solids and oils

HOT MILL – REHEAT FURNACE

Problem: high maintenance costs

Solution: replace city water for surface/recycled water for cooling

CASTING OPERATIONS

Problem: poor water quality in spray chambers and loop

Solution: remove excessive Oil (<5 ppm) and TSS (<10 ppm) to minimize caster nozzle plugging and ultimately casting rejects

Targeted Contaminants

  • Oil & Grease - Free, dispersed and emulsified
  • Hydrocarbons
  • Suspended Solids - incl. coal-tar particles
  • Bacteria
  • Metals
  • TOC/COD
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