METAL FINISHING EQUIPMENT

CHEMICAL SOLUTIONS

product data

 

 Waste Treatment Systems

The most universally used solution in the metal finishing industry today is water. Any water used in a metal finishing processing line, must be properly treated prior to being discharged from the facility. The treatment of these waters can be as simple as pH adjustment, oil / grease removal, cyanide destruction, metal removal, and any combination of the above.

The treatment of rinse waters, or spent process baths can be done in many ways depending on what is being removed. Continuous flow thru or batch treatment systems are available.

Waste Treatment3   Waste Treatment1

The cleanliness of the water being discharged is regulated on the Federal, State, and local level. The regulations depend on where the water is being discharged to. Direct discharge into streams or lakes has different regulations than discharging into a Publicly Owned Treatment Works (POTWs). Consult your local regulatory agencies for discharge requirements in your area.

Some facilities have chosen not to discharge any waters from their metal finishing operations. This eliminates having to comply with any discharge regulations, but, does require special treatment equipment, and periodic shipments of concentrated material to a disposal facility.

Evaporative Tank System    Atmospheric Evaporator

For many years, conventional precipitation systems have been used to produce insoluble metallic hydroxides, then filter these out with clarifiers and filter presses. See our section on FILTER PRESSES for more information. Recent developments in membrane technology has improved on this concept, reducing the size of the system while improving the end result.

Ion exchange systems help to remove anions and / or cations present at very low levels. These systems use resin beds which attract the unwanted material. When the resins become saturated, they can be regenerated and used over. The resultant waste is a concentrated material which must be disposed of.

Electrolytic plate-out systems can also remove unwanted cations or metallics down to very low levels. The resultant waste is a plated cathode panel which may be sold to a scrap house.

Some facilities have chosen not to discharge any waters from their plant. This eliminates the need for discharge permitting. These facilities collect their rinse waters in a holding tank, remove as much water from these solutions as possible, then have the concentrated material hauled away for disposal. This helps reduce the disposal cost.

Diffusion dialysis technology is also available for the removal of contaminants from acidic solutions in order to extend the life. Anodizing baths, sulfuric acid, and nitric acids can be purified by using diffusion dialysis.

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