Process and installation for biological treatment, e.g. by nitrification and/or denitrification, of an effluent including nitrated pollution
First Claim
1. A method for biological treatment of sewage effluent water containing nitrogen pollution, comprising:
- bringing an incident flow of said sewage into a mixing zone with at least one compartment and effecting, by high turbulent mechanical agitation within said compartment, homogeneous suspension of a substantially unconsumable and insoluble granular material in a concentration of at least about 5 g/l, loaded with biomass in a concentration of less than 1 g/liter, in said sewage, and maintaining a generally constant mass concentration in said homogeneous suspension;
circulating said sewage and said granular material in suspension to a separation zone and decanting clarified water from the granular material loaded with active biomass using laminar flow decantation; and
effecting forced and direct recycling of at least 75% of the active biomass fixed to said granular material to the mixing zone.
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Abstract
A process for the biological treatment by nitrification and/or denitrification of an effluent containing nitrogen pollution includes the following steps:
an incident flow of this water is brought into a mixing zone with at least one compartment in which, by turbulent mechanical agitation, an inconsumable and insoluble granular material, loaded with biomass, is put in homogeneous suspension in this water, and is maintained at a more or less constant mass concentration;
this water and this granular material in suspension are circulated in a separation zone from which is extracted on the one hand clarified water, and on the other hand biomass loaded granular material; and
almost all of the active biomass fixed on said granular material is brought back by forced recycling to the mixing zone.
61 Citations
40 Claims
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1. A method for biological treatment of sewage effluent water containing nitrogen pollution, comprising:
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bringing an incident flow of said sewage into a mixing zone with at least one compartment and effecting, by high turbulent mechanical agitation within said compartment, homogeneous suspension of a substantially unconsumable and insoluble granular material in a concentration of at least about 5 g/l, loaded with biomass in a concentration of less than 1 g/liter, in said sewage, and maintaining a generally constant mass concentration in said homogeneous suspension; circulating said sewage and said granular material in suspension to a separation zone and decanting clarified water from the granular material loaded with active biomass using laminar flow decantation; and effecting forced and direct recycling of at least 75% of the active biomass fixed to said granular material to the mixing zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. Installation for biological treatment of a pre-treated sewage effluent water containing a nitrogen pollution comprising:
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a mixing zone with at least one compartment provided with a pipe means for admitting water to be treated and a mechanical means for high turbulent agitation within said compartment, said mixing zone containing a substantially unconsumable and insoluble granular material in a concentration of at least about 5 g/l loaded with fixed biomass in a concentration of less than about 1 g/l forming a homogeneous suspension; a separation zone downstream of the mixing zone provided with an inlet for said homogeneous suspension and with a first channel means for draining off clarified water and a second channel means for draining off the granular material loaded with fixed biomass, said separation zone including a lamellar decantation device; and a recycling pipe fitted with a pumping means for pumping said granular material loaded with fixed biomass, said recycling pipe connecting the second channel means and the mixing zone. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method for biological treatment of sewage effluent water containing nitrogen pollution, comprising:
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bringing an incident flow of said sewage into a mixing zone with at least one compartment and effecting, by high turbulent mechanical agitation within said compartment, homogeneous suspension of a substantially unconsumable and insoluble granular material in a concentration of at least about 5 g/l, loaded with biomass in a concentration of less than about 1 g/l, in said sewage, and maintaining a generally constant mass concentration in said homogeneous suspension; circulating said sewage and said granular material in suspension to a separation zone and extracting, using laminar flow decantation, clarified water from the granular material loaded with active biomass; and effecting forced and direct recycling of at least 90% of the active biomass fixed to said granular material to the mixing zone. - View Dependent Claims (32)
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33. A method for biological treatment of sewage effluent water containing nitrogen pollution, comprising:
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bringing an incident flow of said sewage into a mixing zone with at least one compartment and effecting, by turbulent mechanical agitation within said mixing zone compartment, homogeneous suspension of a substantially unconsumable and insoluble granular material, loaded with biomass, in a concentration of less than about 1 g/l, in said sewage, and maintaining a generally constant mass concentration in said homogeneous suspension while providing sufficient turbulence to effect an internal recycling of at least 10 times the feed rate of said incident flow of sewage; circulating said sewage and said granular material in suspension in a separation zone including lamellar decantation elements and extracting by laminar flow decantation clarified water and the granular material loaded with active biomass; and effecting forced and direct recycling of at least 75% of the active biomass fixed to said granular material to the mixing zone; said granular material being sand having a granulometry of between 80 and 200 μ
m at a mass concentration in said homogeneous suspension of between 5 and 50 g/l. - View Dependent Claims (34)
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35. A method for biological treatment of sewage effluent water containing nitrogen pollution in organic form or in the form of ammonium hydroxide, comprising:
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bringing an incident flow of said sewage into a first zone and effecting, by high turbulent mechanical agitation in said first zone, an homogeneous suspension of a substantially unconsumable and insoluble granular material in a concentration of at least about 5 g/l loaded with biomass in a concentration of less than about 1 g/l in said sewage and maintaining a generally constant mass concentration in said homogeneous suspension while effecting a first biological treatment; circulating said homogeneous suspension into a second zone maintaining said suspension homogeneous by a second high turbulent mechanical agitation in said second zone while effecting a second biological treatment; circulating said suspension from said second zone to a separation zone containing lamellar decantation elements and extracting by laminar flow clarified water and the granular material loaded with active biomass; and effecting forced and direct recycling of at least 75% of active biomass fixed to said granular material to said first zone. - View Dependent Claims (36, 37)
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38. An apparatus for biological treatment of a pre-treated sewage effluent water containing a nitrogen pollution, comprising:
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a mixing zone with at least one compartment provided with a pipe means for admitting water to be treated and a mechanical means for high turbulent agitation within said compartment, said mixing zone containing a substantially unconsumable and insoluble granular material loaded with fixed biomass in a concentration of less than about 1 g/l forming a homogeneous suspension; a separation zone downstream of the mixing zone provided with an inlet for said homogeneous suspension and fitted with a first channel means for draining off clarified water and a second channel means for draining off the granular material loaded with fixed biomass, said separation zone including lamellar decanting elements; and a recycling pipe fitted with a pumping means for pumping said granular material loaded with fixed biomass, said recycling pipe connecting the second channel means and the mixing zone; said granular material being sand having a granulometry of between 80 and 200 μ
m at a mass concentration in said homogeneous suspension of between 5 and 50 g/l.
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39. An apparatus for biological treatment of a pre-treated sewage effluent water containing a nitrogen pollution, comprising:
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an aerobic nitrification reactor provided with a pipe means for inlet of water to be treated, with means for feeding oxygen therewithin and with a first mechanical means for high turbulent agitation therewithin, said aerobic nitrification reactor containing a substantially unconsumable and insoluble granular material in a concentration of at least about 5 g/l loaded with fixed biomass in a concentration of less than about 1 g/l forming a homogeneous suspension; an anaerobic denitrification reactor connected to exit of said aerobic nitrification for circulation of said suspension, provided with a second mechanical means for turbulent agitation therewithin and with an organic carbon inlet pipe; a separation zone downstream of said anaerobic denitrification reactor, provided with an inlet for said suspension and with a first channel means for draining off clarified water and a second channel means for draining off said granular material loaded with fixed biomass; and a recycling pipe provided with a pumping means for pumping said granular material loaded with fixed biomass, said recycling pipe connecting said second channel means to said aerobic nitrification reactor.
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40. An apparatus for biological treatment of a pre-treated sewage effluent water containing a nitrogen pollution, comprising:
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an anaerobic denitrification reactor provided with a pipe means for inlet water to be treated and with a first mechanical means for turbulent agitation therewithin, said anaerobic denitrification reactor containing a substantially unconsumable and insoluble granular material in a concentration of at least about 5 g/l loaded with fixed biomass in a concentration of less than about 1 g/l forming a homogeneous suspension; an aerobic nitrification reactor connected to said anaerobic denitrification for circulation of said suspension, provided with an oxygen feeding input and with a second mechanical means for turbulent agitation therewithin; a first recycling pipe between exit of said aerobic nitrification reactor and said anaerobic denitrification reactor; a separation zone downstream of said aerobic nitrification reactor, provided with an inlet for said suspension, with a first channel means for draining off clarified water and with a second channel means for draining off said granular material loaded with fixed biomass; and a second recycling pipe provided with pumping means for pumping said granular material loaded with fixed biomass, said second recycling pipe connecting said second channel means to said anaerobic denitrification reactor.
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Specification