Chem-Kut coolants are fully amenable to central recycling/reclaiming systems, in which the coolants are centrifuged, filtered, skimmed and treated with biocides if necessary. These treated coolants may be reused after treatment, generally at a ratio of 50/50 with fresh coolant, providing the pH of the used coolant has not dropped below 7.5. If this has happened, indicating acidic contamination of the coolant, the best recommendation would be to dispose of the coolant rather than contaminate a fresh batch and risk early rancidity. If the decision is made to dispose of the coolant, use Chem-Kut Flocculent 3. A de-emulsifier type split procedure is recommended to separate the oil phase from the water portion. Upon approval from the local wastewater treatment facility, the water phase may generally be sewered, with the oil phase being handled by an authorized waste oil reclaiming facility.
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DISPOSAL PROCEDURE FOR OIL CONTAINING METALWORKING FLUIDS:
EQUIPMENT NEEDED: A holding tank of sufficient size to hold the volume to be disposed of, plus an additional 10%. The tank should allow for pumping out and disposal of the lower aqueous layer as well as for removal as waste oil of the upper layer. The treatment tank should be equipped with a suitable agitator or stirrer to disperse the flocculent.
REAGENT: Chem-Kut Flocculent No. 3.
PROCEDURE: Determine the quantity of used coolant to be treated. Add 0.5 to 1.5% Chem-Kut Flocculent No. 3. Mix for 30 minutes. Stop stirring and allow split solution to form 12 to 24 hours. The mix will form an oil layer on top and a hazy clear water layer below. A sample of the lower aqueous layer should be tested for compliance with all applicable environmental regulations before discharge into sewer. The upper oil layer should be collected in waste containers for disposal as waste oil.