Method of purifying tenside and detergent contaminated waste waters
AssigneeKraftwerk Union Aktiengesellschaft
InventorsErwin Schieder, Rupert Stoiber
Life of this patent
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Abstract
Purifying waste waters contaminated with tensides, from nuclear power plants and other plants in which radioactive substances are processed wherein before return of the water to the plant, the water is passed through an evaporator and a mixed-bed filter. Contaminant content of the water is materially reduced by first acidifying the waste water to a pH of 2.5-3, then treating with activated carbon, KMnO.sub.4, MnSO.sub.4 and CaCO.sub.3, and thereafter raising the pH to 8.5-9. The mixture is permitted to form a lower sludge layer and a supernatant water layer. The sludge layer is sent to waste disposal and the supernatant layer is directed to the evaporator.
Claims3
Method of purifying tenside-and detergent-containing contaminated waste waters of nuclear power plant installations and other plants in which radioactive substances are processed, wherein the contaminated water is prior to return to a water loop of the plant, passed through an evaporator and a mixed-bed filter, the improvement comprising
- (a) adjusting the pH of the contaminated waste water to a value of 2.5 to 3 by the addition of sulfuric acid,
- (b) adding the following reactants to the contaminated waste water:--finely-divided activated carbon, KMnO.sub.4, MnSO.sub.4 and CaCO.sub.3,
- (c) agitating the waste water and reactants to effect intimate mixing of the reactants with the waste water
- (d) adjusting the pH of the mixture to a value of 8.5-9 by the addition of an alkaline material, and
- (e) settling the alkaline mixture to form a lower sludge layer and a supernatant water layer of reduced contaminant content which is subsequently passed to the evaporator and mixed-bed filter.
Dependencies are inferred from the claim text.