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Process for reducing the production of sludge by municipal or industrial wastewater purification plants, and equipment for the implementation thereof

A technology for industrial wastewater and purification stations, applied in chemical instruments and methods, water/sludge/sewage treatment, biochemical equipment and methods, etc. Effect

Active Publication Date: 2015-05-27
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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  • Process for reducing the production of sludge by municipal or industrial wastewater purification plants, and equipment for the implementation thereof

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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

A process for reducing the production of sludge by municipal or industrial wastewater purification plants, comprising a step of mesophilic or thermophilic anaerobic digestion (20), or anaerobic digestion combining these two operating modes, of a stream of sludge to be treated (1), and at least one biological solubilization anaerobic treatment step (30); the process comprises, upstream of the anaerobic digestion step, a step of dehydration (10) of the sludge to be treated, followed by a step of mixing (15) the dehydrated sludge with a recirculated fraction of sludge that is more liquid, originating from recycling of the digestion (20), and / or from the anaerobic treatment step (30), and / or centrates originating from a final dehydration (50) of the treated sludge, wherein the recirculation rate is chosen such that the mixture has a dryness suitable for digestion, this mixture then being directed towards 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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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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