Classifications

• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F1/00—Treatment of water, waste water, or sewage
  • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
  • C02F1/5281—Installations for water purification using chemical agents
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/02—Aerobic processes
  • C02F3/12—Activated sludge processes
  • C02F3/1205—Particular type of activated sludge processes
  • C02F3/1215—Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/02—Aerobic processes
  • C02F3/08—Aerobic processes using moving contact bodies
  • C02F3/082—Rotating biological contactors
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/02—Aerobic processes
  • C02F3/12—Activated sludge processes
  • C02F3/1205—Particular type of activated sludge processes
  • C02F3/1221—Particular type of activated sludge processes comprising treatment of the recirculated sludge
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/02—Aerobic processes
  • C02F3/12—Activated sludge processes
  • C02F3/1236—Particular type of activated sludge installations
  • C02F3/1242—Small compact installations for use in homes, apartment blocks, hotels or the like
  • C02F3/1247—Small compact installations for use in homes, apartment blocks, hotels or the like comprising circular tanks with elements, e.g. decanters, aeration basins, in the form of segments, crowns or sectors
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2209/00—Controlling or monitoring parameters in water treatment
  • C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2209/00—Controlling or monitoring parameters in water treatment
  • C02F2209/22—O2
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2305/00—Use of specific compounds during water treatment
  • C02F2305/12—Inert solids used as ballast for improving sedimentation
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W10/00—Technologies for wastewater treatment
  • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

• the present invention relates to the treatment of wastewater of urban or industrial origin, including the primary treatment of water, which may occur before a discharge to the receiving environment or upstream of a biological or physicochemical treatment.
• Pollution treated on wastewater treatment plants is characterized according to the nature of the contents, whether mineral matter, carbon, nitrogen or phosphorus, and its form, be it particulate, colloidal or dissolved.
• the primary treatment of waste water consists in separating by means of a physical action possibly supplemented by a chemical action the particulate fraction of the pollution.
• the implementation of the decanters can be purely physical, or enriched by reagents of chemical or organic origin, allowing a better interception of the colloidal pollution.
• the flocs formed by the addition of reagents may, depending on certain technologies, be ballasted to obtain a more compact structure size.
• Float implementation may include adding reagents
• coagulant and / or flocculators coagulant and / or flocculators
• a flotation agent microbubbles of air for example
• Primary filtration may include the addition of chemical reagents to improve capture of colloidal pollution.
• the choice of a technology depends on a set of parameters: the desired water quality at the outlet, the available footprint, the cost of constructing the equipment, the operating cost, the technical skills required to operate , the equipment or the type of downstream treatment system or the availability of reagents on site.
• a conventional method is to combine a conventional clarifier with the prior treatment with activated sludge at high load.
• This method makes it possible to obtain a good degradation of the dissolved and particulate pollution, but the valorization of the extracted sludge is not satisfactory.
• Another disadvantage is that the installation to implement this method requires a significant footprint related to the installation of a clarifier.
• MBBR Moving Bed Biofilm Reactor
• An aspect of the present invention aims to overcome this lack of technology and to propose a new wastewater treatment plant of urban or industrial origin, including primary water.
• the installation of the invention comprises a biological contact tank (1) equipped with biological rotary discs (8), connected upstream of a weighted floc floc (H) physicochemical settling tank (2), said settling tank being at the month constituted by a coagulation zone (3), a flocculation zone (4), a lamellar settling zone (5) and a thickening zone (6) and an external circuit (7) allowing the recirculation of the thickened sludge in the zone of thickening (6) to the flocculation zone (4) and said biological contacting tank (1).
• primary water means a water treated with a primary treatment as defined above.
• the biological contact tank (1) associated with the biological rotary discs (8) allows the development of two types of biomass within the tank: free biomass in the form of activated sludge and biomass fixed on the biological rotating discs (8) .
• This system makes it possible to reduce, on the one hand, a part of the dissolved and particulate pollution by physical adsorption on the recirculated flocs of the primary clarifier and to eliminate, and on the other hand, the soluble fraction of the non-adsorbed carbon pollution. by biomass.
• the two types of biomass, free and fixed, consist of heterotrophic bacteria, using the readily biodegradable carbon of raw water for their growth.
• the culture fixed on the rotating discs ensures a very fast start in case of increase of the load, making it possible to adapt the number of discs according to the load received.
• the physico-chemical settling floc float placed downstream of the biological contact tank separates the treated water not only from all the particulate pollution contained in the raw water, but also the sludge produced by the degradation of dissolved carbon pollution produced by biological rotating discs. Decantability of the sludge produced by the biomass of the contact tank is ensured by the addition of coagulant in the coagulation zone (3) and the addition of polymer in the flocculation zone (4).
• the physico-chemical settling floc float (2) of the installation of the invention has three complementary roles vis-à-vis those of the biological contact tank:
• the sludge thickened in the thickening zone (6) of the settling tank is recirculated to the flocculation zone (4) and the said biological contact tank (1), which makes it possible to regenerate the free biomass involved in the purification of the pollution. dissolve and recycle the still active polymer to facilitate the free biomass attachment on the rotating biological disks.
• the physico-chemical settler weighted floc (2) can be any decanter of this type known in the prior art, including a decanter Densadeg®.
• the raw water is maintained in the biological contact tank during a very short contact time in order to treat only the dissolved part of the organic pollution, the most easily biodegradable.
• the biological contact tank (1) has a volume for ensuring a contact time of the raw water in said contact tank less than 20 minutes, preferably 10 to 20 minutes.
• the distribution of the recirculation between the flocculation zone (4) and the biological contact tank (1) is parameterizable and can be adjusted by the user.
• the ratios of recirculated flow between the flocculation zone (4) and the biological contact vat (1) are around 30% flow directed in the flocculation zone (4) and 70% in the biological contact vat (1), or vice versa.
• the particulate carbon fraction is left intact for digestion, while the dissolved part is degraded into a very easily fermentable young organic sludge.
• the sludge age obtained for the free biomass is thus very low, less than 0.5 days, in order to limit as much as possible the oxygen consumption linked to bacterial respiration.
• the number and size of the biological rotating discs (8) in the biological contact tank (1) are a function of the dissolved carbon pollution load.
• the biological contact tank (1) of the installation of the present invention makes it possible to eliminate between 20 and 40 g of soluble DB0 5 per m 2 of disk per day.
• said biological contact tank (1) comprises a means for measuring the concentration of dissolved oxygen in the biological contact tank (1), in particular a probe immersed in said tank.
• said biological contact tank (1) comprises a means for measuring the concentration of solid material in said tank.
• said decanter (2) comprises a means for measuring the recirculation rate of the thickened sludge.
• said biological contact tank (1) is confined.
• the installation of the invention can be implemented for various industrial applications, in particular for:
• Another aspect of the invention is to propose a method for treating waste water of urban or industrial origin, in particular a process for the primary treatment of water by an installation of the invention.
• the method comprises the following steps:
• the concentration of solid material in the biological contact tank (1) is maintained from 1 g / l to 2 g / l to promote the formation of biological flocs, while respecting the flow limits applicable on the decanter.
• the recirculation rate of thickened sludge to the biological contact tank (1) is 3% to 10% of the flow rate of raw water. This recirculation makes it possible to maintain a free biomass in activity.
• the recirculation of sludge from the bottom of the decanter (2) can be controlled by a means for measuring the concentration of solids in the biological contact tank (1).
• the recirculation flow can be controlled by a flow measurement means installed in the decanter (2).
• Extraction of excess sludge is controlled by management of the mud web in the decanter, in particular by a sludge sensor sensor.
• the speed of rotation of the disks (8) is a function of the concentration of dissolved oxygen in the biological contact tank (1) and the amount of biomass fixed on the disks.
• the oxygen dissolved in the biological contact tank (1) can be measured by a means for measuring the concentration of dissolved oxygen, in particular a probe, immersed in said tank.
• the amount of biomass attached to the discs is measured by the power consumed at the drive shaft of the discs.
• the concentration of dissolved oxygen to be maintained in the biological contact tank (1) is between 0.2 and 1 mg / L of dissolved oxygen.
• FIG. 1 The invention is further illustrated by FIG. 1 and the examples below.
• FIG. 1 shows an installation of the invention, which is constituted by a biological contact tank (1) equipped with biological rotary discs (8), connected upstream of a weighted floc physico-chemical settling tank (2), said decanter being in the month constituted by a coagulation zone (3), a flocculation zone (4), a lamellar settling zone (5) and a thickening zone (6) and an external circuit (7) allowing the recirculation of thickened sludge in the thickening zone (6) to the flocculation zone (4) and / or said biological contact tank (1).
• An installation of the invention is implemented for the treatment of an urban waste water corresponding to 50,000 eh.
• the flow rate of the raw water to be treated is 10,000 m 3 / d.
• the peak coefficient is 2.
• the pollutant load of this raw water is specified in Table 1 below.
• the totality of oxidizable pollutants present in the raw water is represented by COD (chemical oxygen demand).
• the biodegradable organic carbon pollution in raw water is represented by BOD (demand biochemical oxygen).
• the MES (suspended solids) value corresponds to the quantity of the elements suspended in the raw water.
• the NTK value corresponds to the quantity of nitrogen in organic or ammoniacal form in raw water (Kjeldahl total nitrogen).
• the PT value is the amount of total phosphorus, including particulate phosphorus and dissolved phosphorus.
• the treatment using an installation of the invention is compared with the treatment with the physical-chemical decanter type "Densadeg" alone.
• the installation of the invention offers a significant improvement for the removal of suspended solids (MES), oxidizable organic pollution, and biodegradable organic carbon pollution.
• MES suspended solids
• biodegradable organic carbon pollution MES
• Figure 2 and Table 3 below illustrate a mass balance of the installation of the invention.
• the assessment is carried out for conventional European raw water, for which the MES value is 310 mg / L and the DB0 5 value is 300 mg / L.
• the flow of the raw water entering a biological contact tank, the flow leaving said tank and entering a decanter, the recirculation flow leaving said decanter and entering the contact tank, the flow of the treated treated water said decanter and the flow of sludge leaving said decanter are respectively numbered as stream 1, 2, 3, 4 and 5.
• the installation of the invention makes it possible to eliminate 90% of particulate pollution and of biodegradable carbonaceous organic pollution.

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• Life Sciences & Earth Sciences (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Hydrology & Water Resources (AREA)
• Environmental & Geological Engineering (AREA)
• Water Supply & Treatment (AREA)
• Organic Chemistry (AREA)
• Biodiversity & Conservation Biology (AREA)
• Microbiology (AREA)
• Health & Medical Sciences (AREA)
• Molecular Biology (AREA)
• Chemical Kinetics & Catalysis (AREA)
• General Chemical & Material Sciences (AREA)
• Analytical Chemistry (AREA)
• Separation Of Suspended Particles By Flocculating Agents (AREA)

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• 2014
  • 2014-12-19 FR FR1462900A patent/FR3030483A1/fr not_active Withdrawn
• 2015
  • 2015-12-16 EP EP15817573.7A patent/EP3233736A1/de not_active Ceased
  • 2015-12-16 MX MX2017007934A patent/MX2017007934A/es unknown
  • 2015-12-16 US US15/529,810 patent/US20170327394A1/en not_active Abandoned
  • 2015-12-16 WO PCT/IB2015/059671 patent/WO2016098012A1/fr active Application Filing
• 2017
  • 2017-05-31 PH PH12017501008A patent/PH12017501008A1/en unknown

Non-Patent Citations (2)

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