Method for treating water by ballasted flocculation and decantation

A flocculation and ballast technology, applied in the field of water treatment, can solve problems such as inconvenience, and achieve the effects of reducing loss, increasing concentration, and reducing investment costs

Inactive Publication Date: 2006-11-08
VEOLIA WATER SOLUTIONS & TECH SUPPORT
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0034] However, the method described in this patent has various inconveniences:

Method used

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  • Method for treating water by ballasted flocculation and decantation
  • Method for treating water by ballasted flocculation and decantation
  • Method for treating water by ballasted flocculation and decantation

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Embodiment Construction

[0064] Figure 1 can support the description of device A: it is only sufficient to illustrate the implementation of this device with a hydrocyclone as a separation device to increase the ratio of the underflow diameter to the overflow diameter of the hydrocyclone to recirculate through the underflow sludge and adapt the pump characteristics to the loading required to maintain ballast regeneration efficiency in accordance with specifications.

[0065] The second device (B) proposed by the present invention consists in recirculating part of the overflow of the separation device (hydrocyclone or decanter or any other similar device) in the upstream direction of the flocculation.

[0066] In case of recirculation of 50% of the overflow in the upstream direction of the flocculation, the device allows to maintain the concentration of ballast in the underflow of the separation unit up to 300 kg / m 3 , increasing the concentration of sludge drawn from the initial plot from 8.4 g / L to 16...

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Abstract

The invention relates to a method of water treatment, which consists in: introducing condensed water into a flocculation zone so as to cause the flocculation of fine flocs in the presence of and around the ballast; introducing the mixture into a decanting zone; Separate the treated water in the overflow and separate the mixture of sludge and ballast in the underflow; send at least part of said mixture to the sludge / ballast separation system and introduce the ballast into said separation system and part of the sludge is recycled in or upstream from the flocculation zone. The invention is characterized in that it includes the following steps: sending the mixture to the sludge / ballast separation system, and extracting the mixture from the sludge extracted from the separation system based on the concentration of the ballast. ballast; and more than 20% by volume entering the sludge / ballast separation system is recycled in or upstream from the flocculation zone after passing through at least part of the sludge / ballast separation system; effectiveness of the ballast The diameter is greater than 60 microns, and the concentration of sludge pumped out from the treatment system is higher than 5g / L.

Description

technical field [0001] The present invention relates to the field of water dressing. More precisely, the invention relates to a method for the separation of solids and liquids by flocculation and decantation, especially in the field of water treatment. Background technique [0002] Water treatment, especially for the purification of drinking and municipal surface water or of industrial waste water to remove pollution, generally employing a process consisting in coagulating the water to be purified with active coagulants, usually composed of trivalent metal salts , consisting in flocculating the coagulated water with active flocculants, usually composed of organic polymers, and in decanting the flocs produced in the decanter, drawing off the sludge at the bottom of the decanter, and by the overflow of the decanter Extract purified water. [0003] In particular, the present invention relates to the known technique of flocculation-decantation of ballasted floes, which injects...

Claims

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Application Information

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IPC IPC(8): C02F9/02C02F9/04C02F1/52C02F1/68B01D21/00B01D21/26B01D21/30B04C5/26B04C5/28B04C9/00C02F1/28C02F1/38C02F1/56
CPCC02F1/283C02F1/38C02F1/52C02F1/5281C02F2305/12
Inventor 帕特里克·比诺克劳斯·P·达尔乔·祖巴克
Owner VEOLIA WATER SOLUTIONS & TECH SUPPORT
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