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Method and installation for biologically treating waste water

A waste water purification and biological treatment technology, applied in the direction of sustainable biological treatment, biological water/sewage treatment, chemical instruments and methods, etc., can solve problems such as safety constraints and increased operating costs

Inactive Publication Date: 2010-08-04
DEGREMONT SOC DITE
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0008] Under conditions of small mass loads, efficient handling of carbon is not always compatible with denitrification and causes the incorporation of external carbon, for example in the form of methanol, which, in addition to increasing operating costs, becomes a safety issue in the surrounding area of ​​the workstation. major constraints

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  • Method and installation for biologically treating waste water
  • Method and installation for biologically treating waste water
  • Method and installation for biologically treating waste water

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Embodiment Construction

[0048] in figure 1 Above, you can see wastewater purification facility E, which includes bioreactor 1, which contains microbial populations with different metabolic spectrums to remove carbon and nitrogen, and even phosphorus. A part of the microorganisms are fixed on the movable solid carrier 2, which is schematically indicated by circles in the figure. The arrival of the water to be treated is ensured by the pipeline 3. The output of the treated waste liquid is guaranteed by the pipeline 4. A holding grid (not shown) is provided at the outlet of the treated waste liquid to hold the carrier 2 in the reactor 1.

[0049] Another part of the microorganisms freely exist in the solution in the reactor 1 for the activated mud type treatment.

[0050] The reactor 1 includes a first treatment zone 1 a that is not ventilated and is located on one side of the input pipe 3. This zone is advantageously set up for heavy-load hypoxia treatment. At the bottom of the reactor, the oxygen-poor ...

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Abstract

The invention relates to a method for biologically treating waste water, using a set of micro-organisms having different metabolic spectra, in order to eliminate carbon and nitrogen, even phosphorus. Some of the micro-organisms are fixed to mobile solid carriers (2) and form a fluidised fixed biomass. Some of the micro-organisms are free to be used in an activated mud treatment. To this end, a first non-aerated treatment zone (21a) is followed by a second aerated treatment zone (21b); the treated effluent is subjected to a solid / liquid separation by flotation (6) at a speed higher than 10m / H; and part of the mud recovered by flotation is recirculated (8) towards the activated mud treatment, said recirculation being controlled (9, 10, 11) so that the MES concentration of the effluent subjected to the liquid / solid separation remains compatible with the retained flotation.

Description

Technical field [0001] The present invention relates to a method for purifying wastewater by biological treatment of microorganisms to remove carbon, nitrogen, and even phosphorus. Part of the microorganisms are fixed on a movable solid carrier to form a fluidized fixed biomass. Background technique [0002] The goal of biological treatment of water is to remove carbon, nitrogen, and even phosphorus through the metabolic activities of bacterial groups with different metabolic lineages. These characteristics require some operating conditions, especially specific hydraulic and biological residence time, which requires a multiplication of engineering quantities. As a disadvantage, this causes the construction cost to rise and occupies a lot of land. [0003] The development of biological methods allows development in the form of biofilms fixed on a removable solid carrier, especially as shown in EP 0575314, which makes it possible to deal with small mass loads with smaller processing...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCC02F3/085C02F3/12C02F1/24Y02W10/10
Inventor L·格拉沃洛
Owner DEGREMONT SOC DITE
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