Classifications

• • 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
  • C02F3/10—Packings; Fillings; Grids
  • C02F3/101—Arranged-type packing, e.g. stacks, arrays
• • 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
  • C02F3/06—Aerobic processes using submerged filters
• • 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 invention relates to a fixed bed reactor with at least two stages for the biological treatment of waste water according to the preamble of claim 1.
• the object of the present invention is therefore to provide a fixed bed reactor in which the resulting bio-sludge does not cause blockages and is available to the greatest extent possible for a material conversion and in which the carrier material is arranged in such a way that a uniform flow around the largest possible area of the Carrier material is made possible.
• flat, curved, straight or tubular support elements are used in the fixed bed reactor in such a way that the direction of flow of the liquid to be cleaned is parallel to the large areas of the support elements.
• Such support elements can e.g. Plates or tubes made of a porous sintered plastic material, in which coarser, very fine-pored grains of activated carbon or Liapor, partially open to the surface, are advantageously enclosed.
• the plates or pipes can be flat elements or profiled, e.g. wavy or trapezoidal, body.
• the size of the distance between the plates should be as small as possible in order to have the largest possible exchange area in the To be able to accommodate the reactor. On the other hand, it must not fall below a minimum value in order to avoid the risk of constipation.
• the optimization of the minimum column width depends on the mycelium formation of the microorganisms used in each case and can be determined experimentally. The type of microorganisms is determined by the pollutant content of the substrate to be cleaned. The optimization of the minimum column width also includes that the column width across the cross-section is the same everywhere, otherwise the flow resistance in the columns would be different, which would result in an uneven flow through the reactor cross-section and thus an uneven material conversion.
• the plates are arranged in a ring, the rings formed in this way having a different diameter and being arranged coaxially one inside the other at equal intervals.
• the carrier elements are tubes of different diameters, which are arranged concentrically one inside the other.
• the characteristic of the laminar flow form is the absence of the macroscopic exchange processes in the fluid transversely to the flow direction, which in turn means that the metabolism by the microorganisms only in the immediate carrier elements, i.e. Plate surface takes place where the liquid comes into contact with the microorganisms.
• An economical reactor design therefore makes it necessary to mix the liquid as often as possible in order to gradually bring all pollutant components into contact with the microorganisms.
• a plurality of carrier packs each consisting of a plurality of carrier elements, ie plates, one behind the other, as viewed in the direction of flow, the plates of two successive carrier packs advantageously being arranged with respect to one another in such a way that one plate stands above a gap or vice versa.
• the packages are offset from one another by an angle of, for example, 30 °.
• the ratio of the reactor diameter to the height of the carrier packages can be 4: 1.
• the reactor in a loop arrangement, i.e. to allow multiple flow through the carrier packages by pumping.
• the liquid is sucked off behind the individual loop stages and fed back to the beginning of the loop.
• the liquid withdrawn from the previous stage, or the newly supplied liquid, and the liquid fed back from the subsequent stage come into contact with one another and mix. This mixing becomes particularly intense when the discharge of the previous stage is behind the supply of the following stage and the outlet direction of the liquid is downwards, i.e. in the direction of flow. takes place against the main flow direction.
• Another advantage of the multiple loop arrangement can be seen in an improvement in the controllability or the uniformity of the pH in the reactor. It can happen that the pH setpoint deviates from the permissible range (eg +/- 0.5) at one point of the reactor and requires an acid or alkali metering to compensate. With only one The system becomes sluggish the longer the controlled system is, the larger the reactor volume for a given flow rate. Large fluctuations around the setpoint and long control times are inevitable.
• the subdivision of the reactor volume into several small sub-areas, ie stages with successive carrier packs, with their own pumping facility makes fast regulation possible, which can also start at the sub-area where the deviation is detected. For this purpose, each sub-area has its own pH measuring point.
• control loops can be cascaded with the same aim of more quickly correcting the fault.
• Crucial for an economical reactor operation is an even distribution of the polluted liquid over the cross section of the reactor in order to achieve an optimal degradation rate of the pollutant.
• the distribution becomes more uniform the more inlet openings are regularly distributed over the cross section of the reactor. It is advantageous to adapt this arrangement to the reactor cross-section, i.e. In the case of circular reactor cross sections, the number of inlet openings should be arranged as evenly as possible on concentric circles. Also the
• the radiation flow in the free jet is related to the vertical flow of a baffle plate or the Flow around rotationally symmetrical profiles, both of which can be used in the reactor according to the invention.
• Fig. 2 a section to Fig. 1;
• Fig. 5 is a schematic representation of a
• a profiled plate as a carrier element.
• the carrier package according to the invention according to FIGS. 1 and 2 consists of tubular carrier elements 1 of different diameters, which are arranged concentrically one inside the other.
• the carrier elements 1 are fastened on connecting webs 3 of two annular disks 2a, 2b and are stretched between these disks 2a, 2b.
• the support elements are held in sockets 4a, 4b, which are screwed, glued or welded onto the connecting webs.
• the annular disks 2a, 2b are detachably connected to one another with threaded rods 5a and screws 5b.
• threaded bores 6 are made in the center of the carrier package, into which threaded rods 7 are screwed for introducing the carrier packages into the reactor can.
• claws or blocks are each arranged at the same height, on which the lower annular disk 2b rests.
• the annular disks 2a, 2b are provided with recesses 8 lying one above the other, which are dimensioned such that they fit over the claws or blocks . If the intended row of claws or blocks is reached, a small turn is sufficient to leave the carrier package on. Due to their own weight and the low flow, it is normally not necessary to attach the carrier packs further, however, if necessary, they can be screwed onto the claws or blocks, for example.
• the 3 consists of a plurality of carrier packs 10, which are arranged in a reactor housing 9 at a distance from one another and are arranged between the reactor inlet 12 and outlet 13, as described in more detail in relation to FIGS. 1 and 2, on the inner wall of the reactor fixed claws 11 rest.
• Each level i.e. after each carrier package 10, a pump device 14 is assigned, which sucks off part of the liquid, which emerges from a carrier package 10 and supplies this part of the liquid to the reactor below this carrier package 10 again.
• the loops formed in this way can include one or more carrier packs 10.
• Baffle plates 15 are arranged for better mixing of the different streams, reactor inlet 12, in which liquid from stages located further up is also returned.
• reactor inlet 12 in which liquid from stages located further up is also returned.
• the support elements 1 and the columns arranged between them one above the other. As stated above, however, it is advantageous to provide an offset here.
• FIG. 4 shows a liquid supply which can be connected to one of the pump devices mentioned in FIG. 3.
• This liquid supply consists of an inlet pipe 20, which is connected to a ring line 21, from which branch lines 22, 22 ′ of inward length are directed.
• the branch lines 22, 22 ' have at their ends fork-shaped pipe sections 23, 23', at the ends of which in turn there are inlet openings 24 for the liquid.
• the branch lines 22, 22 'and the pipe sections 23, 23' are arranged so that the inlet openings 24 lie on two or more of the concentric circles presented. The same amount of water should advantageously exit at each opening 24.
• the individual branch lines can also each be connected directly to pump devices.
• the inlet openings 24 point downward, with a baffle plate flowing vertically at a distance of, for example, 10 mm from them.
• a baffle plate flowing vertically at a distance of, for example, 10 mm from them.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Biodiversity & Conservation Biology (AREA)
• Microbiology (AREA)
• Hydrology & Water Resources (AREA)
• Engineering & Computer Science (AREA)
• Environmental & Geological Engineering (AREA)
• Water Supply & Treatment (AREA)
• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Apparatus Associated With Microorganisms And Enzymes (AREA)
• Biological Treatment Of Waste Water (AREA)
• Physical Or Chemical Processes And Apparatus (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=6433523

Family Applications (1)

Country Status (4)

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Family Cites Families (8)

• 1991
  • 1991-06-08 DE DE19914118927 patent/DE4118927A1/de active Granted
• 1992
  • 1992-06-05 WO PCT/DE1992/000464 patent/WO1992022505A1/de not_active Application Discontinuation
  • 1992-06-05 JP JP4510687A patent/JPH06509973A/ja active Pending
  • 1992-06-05 EP EP92911172A patent/EP0588842A1/de not_active Ceased

Non-Patent Citations (1)

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