Process for the purification of polluted water
First Claim
1. A process for the biological purification of polluted water comprising the steps of subjecting the polluted water to successive anaerobic, anoxic and aerobic treatments in the presence of first and second separate cultures of microorganisms, the treatment in the presence of the first culture of microorganisms being carried out solely under anaerobic and anoxic conditions and the treatment in the presence of the second culture of microorganisms being carried out under aerobic conditions.
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Abstract
Process and plant for biological purification of polluted water wherein the polluted water is successively subjected to an anaerobic, anoxic and aerobic treatment in the presence of microorganisms, and wherein the anaerobic and the anoxic treatment are carried out in the presence of one or more microorganism cultures which are different from the microorganism culture used in the aerobic treatment. Hereby better exploitation of organic matter in the water is obtained thus improving the removal of nitrogen, and an increased reaction rate per unit mass of biomass is obtained thereby allowing the amount of biomass to be reduced or the total reaction rate of the plant to be increased.
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Citations
15 Claims
- 1. A process for the biological purification of polluted water comprising the steps of subjecting the polluted water to successive anaerobic, anoxic and aerobic treatments in the presence of first and second separate cultures of microorganisms, the treatment in the presence of the first culture of microorganisms being carried out solely under anaerobic and anoxic conditions and the treatment in the presence of the second culture of microorganisms being carried out under aerobic conditions.
- 9. An apparatus for the biological treatment of polluted water which comprises means for successively subjecting polluted water to an anaerobic and an anoxic treatment solely under anaerobic and anoxic conditions using a first micro-organism culture, means for subjecting the anaerobically and anoxically treated water to an aerobic treatment using a second micro-organism culture which is different and separate from the first micro-organism culture, and means for recycling aerobically treated water to the means for treating the water in anoxic conditions.
Specification