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Water treating method and arrangement integrating a fixed-bacteria biological treatment and flocculation-decantation

A water treatment equipment and biological treatment technology, applied in the fields of flocculation/sedimentation water/sewage treatment, special compound water treatment, biological water/sewage treatment, etc. Effect

Inactive Publication Date: 2008-10-29
ODISHA TV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] Finally, large dry matter concentrations (3-6 g MES / l) in the water to be settled require large reagent doses (typically greater than 1 mg / l flocculation polymer) to be applied over approximately doubled flows due to sludge recirculation, thus lead to large reagent consumption

Method used

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  • Water treating method and arrangement integrating a fixed-bacteria biological treatment and flocculation-decantation

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Embodiment Construction

[0046]Referring to this figure, the water to be treated enters the plant via an inlet 11 to a tank delimiting a biological treatment zone 1 with a solid culture.

[0047] This tank is here shown equipped with rotating biocontactors made of vertical discs mounted on a common horizontal axis 12 of rotation, acting as carriers for the biomass for treatment. It is noted, however, that any other biomass carrier format known to those skilled in the art may be used without departing from the scope of the present invention.

[0048] The air required for biological treatment is brought into contact with the biomass by the rotation of the carrier disc.

[0049] The biologically treated stream in this tank, which then only contains treated excess biomass, has less than 1 g / l of suspended matter, which enters the tank delimiting the mixing zone 2 via channel 21 .

[0050] Within the scope of this embodiment, this channel 21 forms the main inlet channel for the biologically treated stream...

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Abstract

The inventive water treating method and arrangement successively combine at least one step consisting in biological treating at least one part of pollution contained in said waters by a fixed biomass, wherein a bio-cleaned flow logically obtainable at the and of said step, prior to the entry thereof to a next step, contains less than 2 mg / l of MES, and at least one stage for carrying out a flocculation-decantation by ballasted flocs consisting in transferring biologically treated flow to a mixing area (2), preferentially at a velocity gradient ranging from 10 s-<1> to 1000 s<-1>, wherein at least one type of denser than water insoluble granulated material is injected and suspended matters are aggregated around said granulated material particles, in transferring the flow issued from the mixing area (2) to a decantation area, wherein the clarified flow and decantation sludges mixed with the granulated material are separated, in extracting granulated material from the decantation sludges, in recycling major part thereof is in the mixing area (2) and in removing the decantation sludges separated form the granulated material.

Description

technical field [0001] The present invention relates to the field of water treatment. [0002] More specifically, the present invention is primarily concerned with methods that combine immobilized bacterial biological treatment with high-speed clarification of weighted flocs (flocs lestés) of biologically treated water. [0003] The present invention can be used to treat any water containing impurities that can be removed by biological treatment with immobilized bacteria and that requires clarification after biological treatment, such as, inter alia, the following (without prejudice to equivalent use for similar applications): [0004] - waste water treated by bacterial beds, in which the bacteria for treatment are immobilized in water on fixed supports (rollers, plastic or inorganic linings) or on rotating supports (rotating discs or drums used to ensure the supply of oxygen required by the bacteria), to remove excess sludge from biologically treated water; [0005] - Waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/06C02F1/52C02F1/56B01D21/01B01D21/06
CPCC02F3/082B01D21/08C02F2305/12C02F1/54B01D21/2488C02F3/06C02F2001/007C02F1/5236Y02W10/10
Inventor P·索维内特K·巴纳吉C·布卢门沙因
Owner ODISHA TV
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