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Apparatus and method for treating liquid effluents including methanation, biological treatment, digestion of methanated sludge and biological sludge, and methanation of digested sludge

A biological sludge and biological treatment technology, which is applied in the treatment of discharges to purify them, and in the field of urban or industrial waste discharges, can solve the problems of sludge and damage to the image of purification technology, so as to reduce sludge production and improve Biogas production, improve the effect of solubilization and dissolution

Inactive Publication Date: 2016-10-12
VEOLIA WATER SOLUTIONS & TECH SUPPORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, this technology benefits from an unfavorable carbon balance, which damages its image in the purification technology market
[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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  • Apparatus and method for treating liquid effluents including methanation, biological treatment, digestion of methanated sludge and biological sludge, and methanation of digested sludge
  • Apparatus and method for treating liquid effluents including methanation, biological treatment, digestion of methanated sludge and biological sludge, and methanation of digested sludge
  • Apparatus and method for treating liquid effluents including methanation, biological treatment, digestion of methanated sludge and biological sludge, and methanation of digested sludge

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Experimental program
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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 digests the methanated sludge and at least a portion of the thickened biological sludge and recycles 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 tre...

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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 pretreatment plants. These pretreatment devices 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 or methanation device 11 . The use of these pretreatment devices results in the production of raw sludge 12, biogas combusted in the flare rack and...

Claims

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Application Information

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Patent Type & Authority Patents(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