Liquid purification or separation – Processes – Treatment by living organism
Patent
1993-12-15
1995-09-12
Wyse, Thomas
Liquid purification or separation
Processes
Treatment by living organism
210614, 210626, 210631, 210912, C02F 330, C02F 162
Patent
active
054494605
ABSTRACT:
A process is provided for the treatment of water containing sulphide wherein the sulphide is oxidized in an aerobic reactor having a minimum sulphide sludge load. The minimum sulphide load is at least 10 mg of sulphide per mg of the nitrogen present in the sludge per hour, the sludge load being calculated on the basis of the sulphide oxidizing part of the biomass. The minimum sulphide load may also be defined as 25 mg of sulphide per liter of reactor material per hour. The sulphide can be largely oxidized to elemental sulphur which is then separated and reused. Waste water also containing organic matter in addition to varying levels of sulphide is purified without interference of filamentous bacteria using a two-step aerobic process. The process for sulphide removal can be used for the treatment of waste water having high levels of sulphur compounds such as sulphate, sulphite and thiosulphate by first reducing these sulphur compounds in an aerobic step. Heavy metals are removed from water by adding sulphide to the water and precipitating the metals as sulphides; the sulphide can be added by reducing sulphur compounds already present.
REFERENCES:
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patent: 4584271 (1986-04-01), Stern et al.
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By C. Buisman et al., "Optimization of Sulphur Production in a Biotechnological Sulphide-Removing Reactor", Biotechnology and Bioengineering, vol. 35, 1990, pp. 50-56.
By J. Maree et al., "Biological Sulphate Removal in an Upflow Packed Bed Reactor", vol. 19, No. 9, 1985, pp. 1101-1106, Great Britain.
By J. Casey et al., "Treatment of high-sulfate waste by see-saw digester", Chemical Abstracts, vol. 103, No. 12, Sep. 12, 1985, Abstract No. 92376y.
Paques B.V.
Wyse Thomas
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