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Wastewater treatment method comprising decantation and fine screening stages and device for carrying out said method

A kind of water treatment equipment and water treatment technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, filtration treatment, water/sewage treatment, etc., and can solve problems such as high cost

Inactive Publication Date: 2008-11-19
VEOLIA WATER SOLUTIONS & TECH SUPPORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] Although more compact than the slower finishing technologies of filtration through microlayers and / or up-going sand, this rapid filtration technology is still relatively costly due to the size of the filtration equipment required

Method used

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  • Wastewater treatment method comprising decantation and fine screening stages and device for carrying out said method
  • Wastewater treatment method comprising decantation and fine screening stages and device for carrying out said method

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Embodiment Construction

[0067] Such as figure 1 As shown, the principle of the present invention is to pass untreated or biologically treated water sequentially through a settling tank 1 and then through a screening system 2 external to the settling tank and having a mesh size in the range of 5-25 microns , preferably 8-12 microns.

[0068] A weight of this type can consist, for example, of sand.

[0069] refer to figure 2 , the sedimentation technique used is preceded by a coagulation step 3, carried out in-line or in a coagulation tank, with injection 31 of inorganic salts or cationic polyelectrolytes, and a flocculation stage 4 of injection 41 of anionic or cationic polyelectrolytes (polymers).

[0070] According to another variant that can be envisioned, the settling tank 1 is a sludge recirculation settling tank in which at least one coagulant and flocculant is added, operating at a rate of at least 20 m / h.

[0071] According to yet another variant that can be expected, the settling tank 1 i...

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Abstract

The invention relates to a wastewater treatment method for reducing the content thereof in suspended materials, in particular in parasites, comprising a decantation stage consisting in transferring said waters to a decanter at a treating rate greater than 10 m / h, wherein said decantation stage is followed by a fine screening stage carried out with the aid of a screen whose mesh size ranges from approximately 5 micrometers to approximately 25 micrometers.

Description

technical field [0001] The present invention relates to the field of water treatment. More specifically, the invention relates to physical or physicochemical methods for reducing the content of suspended matter or parasites in such waters, and devices corresponding to such methods. [0002] The present invention can be used to treat any water containing suspended matter where it is desired to reduce the suspended matter content, such as, inter alia: [0003] - wastewater that has been biologically treated in order to further purify it; [0004] - waste water intended for reuse after treatment, for example in industry or in agriculture, especially for irrigation; [0005] - water intended for discharge into the sea; [0006] -Wastewater that has been treated biologically or abiotically in order to control the residual phosphorus content of the effluent. [0007] As will be shown below, the method and apparatus according to the invention are particularly advantageous for the...

Claims

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Application Information

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IPC IPC(8): C02F9/00C02F1/52C02F1/00B01D21/00
CPCC02F1/004B01D21/0012B03D3/02B03D3/06C02F1/28C02F1/32C02F1/44C02F1/52C02F2209/40C02F2303/04C02F2303/24C02F2305/12B01D21/00C02F1/00C02F9/00
Inventor P·萨维格内特C·P·达尔
Owner VEOLIA WATER SOLUTIONS & TECH SUPPORT
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