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
  • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
  • B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
  • B01D21/02—Settling tanks with single outlets for the separated liquid
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01D—SEPARATION
  • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
  • B01D21/28—Mechanical auxiliary equipment for acceleration of sedimentation, e.g. by vibrators or the like
  • B01D21/286—Means for gentle agitation for enhancing flocculation
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F11/00—Treatment of sludge; Devices therefor
  • C02F11/06—Treatment of sludge; Devices therefor by oxidation
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F11/00—Treatment of sludge; Devices therefor
  • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
  • C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
  • C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
• • 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
  • C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
• • 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
  • C02F1/72—Treatment of water, waste water, or sewage by oxidation
  • C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
• • 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
  • C02F2209/40—Liquid flow rate
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2301/00—General aspects of water treatment
  • C02F2301/06—Pressure conditions
  • C02F2301/066—Overpressure, high pressure
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F2303/00—Specific treatment goals
  • C02F2303/06—Sludge reduction, e.g. by lysis

Definitions

• the present invention relates to a process for clarifying water by treating the colloidal structures contained in a liquid and / or sludge fed with a continuous flow at a given flow rate.
• colloids which are present either in the suspended solid parts in particular in their organic fraction, or in the waters themselves.
• colloids give the entire effluent a color and opacity characteristics, which is a source of inconvenience.
• the invention by attacking these colloidal structures, will allow to obtain an effluent after particularly transparent treatment.
• They essentially consist in adding one or more coagulants, then flocculants, into the purification process chain in quantities sufficient to agglomerate and fix the colloids, which is then removed for example by decantation or centrifugation.
• Colloidal particles are known to have two essential characteristics.
• the flocculation makes it possible to tackle the problem of the small diameter of the colloids.
• Their low mass does not allow in fact natural sedimentation and exploitable in the context of a treatment.
• flocculant an agglomeration of the colloidal particles is generated, the agglomerate of colloids called floc having a sufficient mass to be able to decant.
• the added flocculant is usually a polymer whether organic or natural.
• the invention starts from an idea radically different from the ideas of the prior art, to eliminate colloids.
• the process facilitates liquid / solid separation and provides excellent results, whether used alone or in combination with other separation techniques such as centrifugation or filtration.
• this method makes it possible to obtain excellent results alone for very mineralized sludge (that is to say having a% of matter organic on 100% by weight of dry matter less than 5 to 15%).
• the method implements a simple device of very small size, easily transportable, which will therefore be able to be installed on inaccessible sites.
• the treatment according to the invention also generates no pollution while implementing a technique in itself much more economical than those known in the field of liquid / solid separation (centrifuge, filter press, filter band, oxygenated continuous recirculation) , etc). Finally, with the invention surprisingly obtained a porous cake and dehydrated new type constituting a usable residue.
• V EB is of course a volume value for example expressed in m 3 .
• enclosure By enclosure is meant a tank or a reactor of determined closed volume comprising an inlet of the flow and an outlet of the flow after treatment of more limited section than the reactor.
• the enclosure is thus an enclosure for passing the flow under pressure.
• V By a value v ⁇ V / 20 or v ⁇ 5% V is meant a value less or less, with a tolerance of the order of + 10% to 20%.
• the excellent results are attained thanks to the combination of several functions in the same small enclosure with four functional zones.
• a rising zone of the bed constituted, for a quantity by weight of about 1 of gas, 0.1 of water and 0.01 of solid.
• this zone a very strong mixing is made possible by the air intake of the recommended quality (flow and pressure).
• a decompression zone for example, regulated by a valve located in the upper part of the reactor.
• this valve it should allow to maintain the reactor at a relative pressure of about 0.5 to 2 bars.
• the hydraulic regime in the enclosure is thus arranged to be highly turbulent (R e >> at 3,000 m 2 / s), which leads, in combination with the oxidation linked to the injection of air, the elimination or breaking of the colloidal structures.
• the method according to the invention allows the stripping of the molecules dissolved in the water, resulting in a significant depollution and thus further helping the desired clarification.
• the flow is formed of at least two partial flows, which are projected on one another.
• the flow is injected into the chamber by two opposite identical orifices facing each other situated in the lower half of said enclosure, the air being injected below said orifices, air, water and mud escaping at the top of the enclosure;
• the air is injected with a flow rate of> 1.5 ⁇ EB , for example greater than 5 ⁇ EB , 10 ⁇ EB or between 1.5 ⁇ 15 ⁇ Q EB ;
• the air is injected at medium pressure.
• pressure is understood to be between 1.4 bar and 2.5 bar, advantageously between 1.6 bar and 1.9 bar. Such pressure generates larger bubbles that will be able to better penetrate the medium by spreading randomly in the enclosure.
• At least one liquid reagent is added continuously at a flow rate inside the enclosure
• the flow rate Q EB is greater than or equal to 15 m 3 / h, the flow rate d is greater than or equal to 25 m 3 / h and the relative pressure in the enclosure is greater than or equal to 0.8 bar;
• the flow rate Q EB is greater than or equal to 20 m 3 / h, the flow rate d is greater than or equal to 50 m 3 / h and the relative pressure in the enclosure is greater than 1.2 bar;
• the liquid reagent is an organic flocculant of cationic type.
• the effluents are degassed at the outlet of the enclosure and the gases obtained are used to supply the air injection at the bottom.
• a closed chamber of volume v ⁇ V EB / 20 comprising at least two opposite identical orifices facing each other situated in the lower half of said enclosure,
• flow evacuation means arranged to maintain the enclosure under overpressure.
• the flow is discharged at the top through a pressure relief valve triggering above a determined threshold value.
• volume v ⁇ VV EB / 50 is advantageously advantageously the volume v ⁇ V EB / 100.
• the device comprises means for supplying a liquid reagent at a determined flow rate directly into the chamber.
• FIG. 1 is a diagram illustrating the principle of the processing method according to an embodiment of the invention.
• FIG. 2 is an operating diagram of an embodiment of a device according to the invention.
• FIG. 3 is a schematic view illustrating the transformation of a sludge using a device according to the invention.
• FIG. 1 shows the principles of the method of treatment or breaking of the colloidal structures contained in an effluent, according to the embodiment of the invention more particularly described here.
• a reactor 1 formed of an enclosure 2, oblong, extending around an axis 3, of small volume v for example of the order of 50 liters, the effluents (arrows 4) are injected by two opposite taps 5 , 6, symmetrical with respect to the axis 3 of the enclosure.
• the taps are located in the lower part of the enclosure, for example at a distance h from the bottom 7 of the enclosure between the fifth and the third of the height H of the enclosure.
• the pumping of water from the outside (not shown) introduced into the enclosure of the small reactor 1 by the two opposite connections allows a shock between the flow in the zone 8 due to the outlet pressure of the feed pump or pumps (not shown), which depends on the water height of said feed pumps upstream of the connections and losses of the circuit.
• the kinetic energy of pumping is then transformed into shock energy, maximized by increasing the speed of introduction into the chamber for the outlet of the taps of the fittings 9 of reduced dimensions, but compatible with the maximum particle size of the sludge.
• overpressed is meant a slight excess pressure which may be between 0.1 bar relative and 1 bar relative to the atmospheric pressure, for example 0.8 bar relative.
• a ramp 11 of air distribution for example a ramp formed by a circular pipe, serpentine or slender, to bring air bubbles distributed on the surface of the air. enclosure, through orifices 12, distributed along said pipe 13.
• the air can also be brought by a quilting at the bottom.
• the ramp is located below the effluent meeting point in zone 8, for example between the tenth and fifth of the height H of the chamber, and generates large bubbles B, for example bubbles with a diameter of between 1 mm and 1 cm.
• the decolloid solid material obtained at this level is more porous and subsequently easily compactable. It can even, depending on its initial organic matter content, be directly permeable out of the reactor.
• the air is introduced at an average pressure, for example between 1.6 bar and 1.9 bar absolute at the pressure in the chamber itself, so that there may be large bubbles in the medium, which will be able to penetrate and randomly distribute in the reactor to achieve the expected mixture.
• the air is also introduced at high flow d, that is to say from 1.5 times to 15 times (in Nm 3 / h) that Q EB of the incoming water (in m 3 / h).
• the gas extracted from the reactor comes out with the water and the sludge at the flow rate of the booster and can be recovered, treated and if necessary recycled for reuse in the lower part of the reactor.
• the pressure of the chamber is arranged and / or adjusted to optimize the internal energy by generating a rising flow coming from above.
• Such a pressure is therefore determined according to the functional characteristics of the circuit (pump water height) but also the type of effluents and the desired treatment rates.
• the finally chosen size of the reactor will also be determined by those skilled in the art based on the basic knowledge of the engineer in the field of chemical engineering and flow diagram.
• the pressure and the output are for example ensured by means of a valve valve which releases the flow when the given pressure is exceeded.
• a coagulant is additionally added (example lime, ferric chloride, etc.).
• the small size of the enclosure also makes it easily transportable, and allows its installation in difficult access sites, while allowing a continuous operation of great simplicity.
• the treatment according to the invention generates no pollution, and this with a much more economical installation compared to other treatment systems conceivable for the sole work of liquid / solid separation such as centrifuges, press filters, filters band etc.
• the improvement ⁇ in dryness, obtained with the method according to the invention for a sludge of an industrial purification plant of Fos-sur-Mer, which is only slightly mineralized, has been shown in Table II below (90%). % organic matter) in the field of petrochemicals.
• results are also given according to the initial state of the sludge i.e. cool (without intermediate storage) not fresh (after storage of three days) or fermented (several days of storage in the absence of oxygen).
• the treatment with the invention alone is to be compared with the band-only filter which does not exceed an improvement in dryness of 15 to 18%.
• FIG. 2 shows an operating diagram of a device 20 according to the embodiment of the invention more particularly described here.
• the enclosure is for example constituted by a cylindrical portion 24 terminated in the upper part and in the lower part by two identical conical zones 25 for example with angles at the top of the order of 120 °.
• Each end is itself terminated by an upper tube 26, and lower 27.
• the lower tube 27 is connected to an intermittent discharge pipe 28, provided with a valve 29, dry matter 30 which would have been decanted in the bottom 27 of the enclosure.
• the device 20 further comprises means 31 for supplying the air chamber 32 at a flow rate below the orifices 22.
• This supply is for example via a straight pipe or tube 33, of small diameter, for example 5 cm in diameter, of length substantially equal to the diameter of the cylindrical chamber, comprising nozzles 34 regularly distributed, compressed air outlet distributed in the chamber, creating significant bubbles that will cause significant brewing (round 35).
• Means 36 known per se, for feeding a liquid reagent 37, for example a coagulant, are provided. They are for example formed of a storage tank 38, feeding via a metering pump 39 and a remote control valve 40, the inside of the enclosure above the taps 22, in the turbulence zone.
• the device 20 further comprises means 41 for the continuous discharge of the liquid having entered the chamber via a valve or valve 42 which opens beyond a determined pressure in the chamber, by example 1.3 bar.
• the effluent 43 is then evacuated at the top to end in a tank 44 decantation known in itself.
• this settling tank 44 is constituted by a cylindrical tank 45 in which the discharge pipe 46 ends below the level 47 of operation to limit turbulence.
• the tank 44 empties itself overflow at 48, through a portion 49 of non-turbulent side tank separated from the rest of the tank by a perforated wall in places.
• the decanted solid material 50 is discharged in the lower part 51 for subsequent treatment.
• FIG. 3 shows a view from above of the device 20 of FIG. 2 making it possible to obtain, from the sludge 52, the wafer 53, according to the invention.
• the same references will be used to designate the same elements.
• the air supply 32 is below the connections as described above, by a stitching 56.
• a reagent (coagulant such as ferric chloride, or lime) known in itself and adapted by those skilled in the art as a function of the treated effluents, is fed continuously into the chamber E from the tank 38 via the metering pump. 39.
• This Vietnamese ⁇ de and defragmented effluent is then fed into the settling tank 45. After settling which takes place continuously in a few seconds, then in 58 is observed an extremely clear water, for example allowing 99% of the light passing through it to pass, see 99.5%.
• the mud content i.e. the percentage by mass of solids, is for example between 3 and 10%.
• this effluent is injected into the reactor through the two taps 22 vis-à-vis. Simultaneously air is supplied by the lower ramp 33 of the reactor with a flow rate greater than 25Nm 3 / h, for example.
• the pressure inside the latter is between 0.3 and 1.5 bar relative, for example greater than 0.8 bar relative, depending on the water height of the pump and / or the pumps of supply of the effluents, as well as the pressure drop created by the enclosure itself and by the discharge valve 42 located in the upper part of said enclosure.
• the pressure inside the reactor can in particular be regulated via this upper valve or valve.
• This time can even be very low since, with an effluent flow rate greater than 20 m 3 / h, it is possible, for example, to remain in the chamber for less than 10 seconds.
• the mud feed rate has a direct action on the percussion speed according to the table produced above, knowing that the contact and residence time in the pressurized reactor also affects the formation speed of the flocs. and their settling.
• the air flow and the influence of the pressure in the reactor are also elements which, in view of the desired result, will be adapted, so as to reach the skilled person.
• the sludge Once the sludge has been treated, it leaves the reactor at a pressure corresponding to the flow pressure of the flow of the fluid in the pipe 43, to the settling tank 45, in which the settling will take place in a manner known per se. .
• the water obtained by supernatant is of high purity and is evacuated itself continuously in 58.
• the mud obtained at the bottom of the settling tank is evacuated either continuously or discontinuously, according to specific periods, for example once a day.
• the treatment operated by the method and reactor according to the invention thus makes it possible to obtain a porous and dehydrated cake, the recovered sludge being empty, dry and manipulable. A few hours are enough against three months in the context of a so-called conventional drying use, to obtain a comparable result, and still the characteristics of the mud obtained being much better with the invention because more easily recyclable.
• the present invention is not limited to the embodiments more particularly described. On the contrary, it embraces all the variants and in particular those in which the effluent supply taps are not two in number but three, four or more, distributed regularly and angularly around the enclosure.

Landscapes

• Chemical & Material Sciences (AREA)
• Water Supply & Treatment (AREA)
• Life Sciences & Earth Sciences (AREA)
• Hydrology & Water Resources (AREA)
• Engineering & Computer Science (AREA)
• Environmental & Geological Engineering (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Organic Chemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Treatment Of Sludge (AREA)
• Separation Of Suspended Particles By Flocculating Agents (AREA)
• Physical Water Treatments (AREA)
• Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
• Activated Sludge Processes (AREA)

Priority Applications (22)

Applications Claiming Priority (2)

Related Child Applications (2)

Publications (1)

Family

ID=44010031

Family Applications (1)

Country Status (25)

Families Citing this family (6)

Citations (4)

Family Cites Families (14)

• 2010
  • 2010-10-29 FR FR1004285A patent/FR2966819B1/fr not_active Expired - Fee Related
• 2011
  • 2011-10-28 PT PT117877001T patent/PT2632860E/pt unknown
  • 2011-10-28 MX MX2013004789A patent/MX336194B/es unknown
  • 2011-10-28 SI SI201130367T patent/SI2632860T1/sl unknown
  • 2011-10-28 HR HRP20150055AT patent/HRP20150055T1/hr unknown
  • 2011-10-28 RS RS20150027A patent/RS53766B1/sr unknown
  • 2011-10-28 EA EA201300406A patent/EA028393B1/ru not_active IP Right Cessation
  • 2011-10-28 WO PCT/FR2011/000583 patent/WO2012056129A1/fr not_active Ceased
  • 2011-10-28 DK DK11787700.1T patent/DK2632860T3/en active
  • 2011-10-28 NZ NZ609902A patent/NZ609902A/en unknown
  • 2011-10-28 US US13/881,508 patent/US10029930B2/en active Active
  • 2011-10-28 AU AU2011322382A patent/AU2011322382B2/en active Active
  • 2011-10-28 EP EP11787700.1A patent/EP2632860B1/fr active Active
  • 2011-10-28 PL PL11787700T patent/PL2632860T3/pl unknown
  • 2011-10-28 ES ES11787700.1T patent/ES2528046T3/es active Active
  • 2011-10-28 MY MYPI2013001537A patent/MY165320A/en unknown
  • 2011-10-28 ES ES14003511.4T patent/ES2625634T3/es active Active
  • 2011-10-28 JP JP2013535483A patent/JP5827340B2/ja active Active
  • 2011-10-28 SG SG2013033543A patent/SG190094A1/en unknown
  • 2011-10-28 CN CN201180052172.8A patent/CN103328391B/zh active Active
  • 2011-10-28 CA CA2815958A patent/CA2815958C/en active Active
  • 2011-10-28 EP EP14003511.4A patent/EP2826752B1/fr active Active
  • 2011-10-28 KR KR1020137012175A patent/KR101976216B1/ko active Active
  • 2011-10-28 BR BR112013009994A patent/BR112013009994B1/pt not_active IP Right Cessation
• 2013
  • 2013-04-28 IL IL225999A patent/IL225999A0/en unknown
  • 2013-04-29 CL CL2013001182A patent/CL2013001182A1/es unknown
• 2015
  • 2015-01-15 CY CY20151100035T patent/CY1115941T1/el unknown
• 2018
  • 2018-07-20 US US16/040,635 patent/US11623882B2/en active Active
• 2019
  • 2019-05-12 IL IL266571A patent/IL266571B/en active IP Right Grant

Patent Citations (4)

Non-Patent Citations (1)

Also Published As

Similar Documents

Legal Events