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Method for reducing sludge production in municipal or industrial wastewater purification stations and equipment for implementing the same

A technology for industrial wastewater and purification stations, applied in chemical instruments and methods, adjustment methods for biological treatment, biochemical equipment and methods, etc., can solve problems such as high pollution risks, and achieve the effect of reducing concentration and improving dryness.

Active Publication Date: 2019-03-22
DEGREMONT SOC DITE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus there is a high risk of contamination if one wishes to enhance the process

Method used

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  • Method for reducing sludge production in municipal or industrial wastewater purification stations and equipment for implementing the same

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Embodiment Construction

[0042] The figure shows a sludge treatment plant according to the invention comprising upstream a dewatering unit 10 of sludge 1 to be treated from a municipal or industrial water treatment line. The device 10 can be a belt filter, a centrifuge, a filter press or any other dehydration device that can significantly improve the dryness of the sludge. The higher the dryness, the greater the overall cost savings of the method. Typically, at the outlet of the dehydration unit 10, the dryness to be achieved will be 20-30% dry matter. This dewatering may involve the entire sludge stream or only a part thereof, the other part coming from piping (not shown) bypassing the device 10 .

[0043] The plant implementing the method of the invention is advantageously independent of the waste water treatment line; the sludge produced in this water treatment line is conveyed or transferred to the plant of the invention.

[0044] The outlet of the dewatering unit 10 is connected by a pipe 11 to...

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Abstract

The present invention relates to a method for reducing the generation of sludge in municipal or industrial waste water purification stations, comprising a step (20) of mesophilic or thermophilic or anaerobic digestion combining both modes of operation of the sludge (1) stream to be treated, and at least one biosolubilization aerobic treatment step (30); the process comprises, upstream of the anaerobic digestion step, a dewatering step (10) of the sludge to be treated, followed by combining the dewatered sludge with a more liquid sludge A step (15) of mixing the recirculation portion of the sludge resulting from the recycling of the digestion (20) and / or from the aerobic treatment step (30), and / or from the treated sludge Filtrate and / or sludge resulting from the final dewatering (50) of , the ratio of the recycle is chosen so that the mixture has a dryness suitable for the digestion, this mixture is then directed to the digestion.

Description

technical field [0001] The present invention relates to a method for reducing sludge production in municipal or industrial wastewater purification plants of the type comprising mesophilic or thermophilic digestion of sludge streams to be treated or anaerobic digestion combining both modes of operation steps, and at least one sludge biosolubilization aerobic treatment step. Background technique [0002] A method of this type is known, inter alia, from FR 2 849 019. According to this prior art method, stress aerobic treatment with thermophilic enzymes is applied to the digested sludge, especially at 60-70°C for 24-72 hours, which enables the realization of an anaerobic digestion process by Solubilization of 20-40% of the organic matter and 5-25% of the inorganic matter contained in the obtained sludge and a part of this sludge is returned to the digester. However, this approach has several drawbacks, including those described below: [0003] - If it is desired to intensify ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/00C02F3/00C02F3/02C02F3/28C02F11/04C02F11/12
CPCC02F3/006C02F3/02C02F3/2893C02F9/00C02F11/04C02F11/127C02F2209/02C02F2209/06C02F2209/14C02F2209/15C02F2209/40C02F2301/10C02F2301/106C02F2303/10C02F2303/12Y02E50/30Y02W10/10Y02W10/30C02F3/12C02F3/1221C02F3/28C02F3/30C02F3/308C02F2301/046C12M21/04C12M29/06C12M41/12C12M41/26
Inventor P·E·帕尔多
Owner DEGREMONT SOC DITE
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