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Plant and process for treating a liquid effluent comprising a methane fermentation, a biological treatment, a digestion of methane-fermented sludges and of biological sludges, and a methane fermentation of digested sludges

A biological sludge and biological treatment technology, which is applied in the treatment of urban or industrial waste discharges, treats the discharges in order to purify them, and can solve problems such as sludge, so as to reduce sludge production, increase biogas production, and improve biogas production. solubilizing effect

Inactive Publication Date: 2014-05-14
VEOLIA WATER SOLUTIONS & TECH SUPPORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Another disadvantage of this prior art is related to the fact that it results in relatively large volumes of sludge

Method used

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  • Plant and process for treating a liquid effluent comprising a methane fermentation, a biological treatment, a digestion of methane-fermented sludges and of biological sludges, and a methane fermentation of digested sludges
  • Plant and process for treating a liquid effluent comprising a methane fermentation, a biological treatment, a digestion of methane-fermented sludges and of biological sludges, and a methane fermentation of digested sludges
  • Plant and process for treating a liquid effluent comprising a methane fermentation, a biological treatment, a digestion of methane-fermented sludges and of biological sludges, and a methane fermentation of digested sludges

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Embodiment Construction

[0072] 6. Description of Embodiments of the Invention

[0073] 6.1. Review of the principles of the invention

[0074] The general principle of the invention is based on a completely original technique for treating liquid effluents, comprising methanating the effluents in a methanation plant, biologically treating the methanated effluents from the methanation plant, extracting The treated thickened biological sludge, anaerobically digesting the methanized sludge and at least a portion of the thickened biological sludge and recycling at least a portion of the digested sludge to the methanation unit.

[0075] The implementation of this technology enables:

[0076] - treatment of discharges at temperatures between 5 and 15 °C in a compact device,

[0077] - reduce the production of sludge, and

[0078] - Increased production of biogas.

[0079] 6.2 Example of a device for treating liquid discharges according to the invention

[0080] image 3 One embodiment of a device for ...

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Abstract

The invention relates to a process for treating liquid effluent, said process comprising a step of methane fermentation of said effluent within a methane fermenter (32) producing biogas, methane-fermented sludges and a methane-fermented effluent, a step of biological treatment of said methane-fermented effluent within a biological treatment zone (34) producing biological sludges and a treated effluent, a step of extraction of thickened biological sludges from said biological treatment zone (34), a step of anaerobic digestion of at least one portion of said methane-fermented sludges and of said thickened biological sludges within a digestor (44) producing biogas and digested sludges, a step of recirculating at least one portion of said digested sludges to said methane fermenter (21), and a step of extracting at least one portion of the digested sludges.

Description

technical field 1. Field of the invention [0001] The field of the invention is that of treating effluents in order to purify them. [0002] The invention applies more particularly in the field of treatment of municipal or industrial waste discharges. Background technique [0003] 2. Existing technology and its disadvantages [0004] Municipal or industrial waste discharges are generally treated to purify them before being discharged into the natural environment. [0005] refer to figure 1 , the commonly employed technique aimed at purifying such effluents 10 consists in conveying them to a pretreatment device 11 . These pretreatment devices 11 generally include a trash rack device, a sand removal device, an oil removal device, and a UASB (English Upflow Anaerobic Sludge Blanket (upflow anaerobic sludge bed)) type methanation reactor. The use of these pretreatment devices 11 results in the production of raw sludge 12, biogas combusted in the flare rack and pretreated ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F3/30C02F3/28
CPCC02F3/006C02F3/2846C02F3/286C02F3/308C02F2209/001C02F2209/02C02F2209/06C02F2209/08C02F2209/285C02F2301/103C02F2301/106C02F2303/10Y02E50/30Y02W10/30
Inventor T·阿诺
Owner VEOLIA WATER SOLUTIONS & TECH SUPPORT