JP2008114144A - Method and apparatus for treating waste water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for treating waste water, by which waste water can be effectively treated even when high-concentration waste water flows in irregularly. <P>SOLUTION: The method for treating waste water comprises the steps of: supplying waste water to a first biological treatment tank 4 in which a swingable or movable microorganism carrier 5, on which a microorganism for treating waste water is deposited, is arranged dispersedly to subject the supplied waste water to primary treatment in a state preventing the clogging; and supplying the primarily-treated waste water to a second biological treatment tank 8 in which a swingable microorganism carrier 9 swingably supporting a microbe-deposited fibrous body carrying the microorganism is arrayed in higher density than that of the microorganism carrier in the first biological treatment tank 4 to subject the primarily-treated waste water to secondary treatment. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wastewater treatment method and apparatus, and more particularly to a wastewater treatment method and apparatus capable of effectively treating wastewater with a high concentration that flows irregularly.

  Conventionally, in a wastewater treatment method for treating wastewater biochemically, organic matter in wastewater is formed on a rocking carrier made of biocompatible fibers such as carbon fiber and aramid fiber, which spreads and swings sufficiently in water. It is known to support activated sludge (microorganisms) that treats and arrange in a treatment tank to improve the biochemical treatment of organic substances in the wastewater supplied into the treatment tank (for example, patents) Reference 1).

Further, as shown in FIG. 5, a treatment tank in which a plurality of swinging carrier bodies 23 made of carbon fibers in the form of a single yarn are attached to a rope 24, and the rope 24 is provided with an aeration device 22 at the bottom. There is also known a wastewater treatment apparatus arranged in a large number 21 in a suspended manner (see, for example, Patent Document 2).
JP-A-11-188378 JP 2000-325973 A

  However, when a treatment device in which a large number of carriers made of fibers that spread and sway in water as described above is applied to a wastewater treatment device from a food factory or the like, wastewater with a high concentration is applied. However, the oscillating carrier carrying activated sludge is blocked in a short period of time, and the waste water treatment cannot be performed.

  In view of the above-described conventional problems, an object of the present invention is to provide a wastewater treatment method and apparatus that can be effectively treated even when high-concentration wastewater flows in irregularly.

  The wastewater treatment method of the present invention performs primary treatment by supplying wastewater to a first biological treatment tank in which a swingable or movable microorganism carrier carrying microorganisms for treating wastewater is dispersed and arranged in the tank, The second organism in which the oscillating microorganism carrier supporting the microorganism supporting fiber body supporting the microorganisms is arranged more densely than the microorganism carrier in the first biological treatment tank as the waste water after the primary treatment is performed. The secondary processing is performed by supplying the processing tank.

  With this configuration, the first biological treatment tank in which the microbial carrier is dispersed and disposed first, so that even when a high concentration of wastewater flows in irregularly, the microbial carrier is blocked and cannot be treated. The primary treatment for sufficiently lowering the BOD was performed without becoming a state, and the oscillating microorganism carrier was arranged more densely than the microorganism carrier in the first biological treatment tank in the waste water after the primary treatment. By performing the treatment in the second biological treatment tank, it is possible to stably perform the treatment for reducing the desired BOD.

  In addition, when the wastewater is supplied from the inflow adjusting tank having the aeration device to the first biological treatment tank, oxygen necessary for the treatment is sufficiently dissolved in the wastewater before the treatment, so that the treatment in the subsequent first biological treatment tank is performed. Done effectively.

  In addition, if the wastewater after the secondary treatment is aerated in an aeration tank having an aeration apparatus and then separated into sludge and treated water in a sedimentation tank, the secondary discharged from the second biological treatment tank before the sludge separation. By supplying sufficient oxygen to the treated wastewater, the ammonia nitrogen remaining in the wastewater can be reliably oxidized and removed.

  Further, the waste water treatment apparatus of the present invention includes a first biological treatment tank in which a swingable or movable microorganism carrier that carries microorganisms for treating waste water is dispersed in the tank, and a microorganism carrier that carries the microorganisms. And a second biological treatment tank in which a oscillating microorganism carrier that supports the fiber body so as to be capable of rocking is arranged more densely than the microorganism carrier of the first biological treatment tank. The effect can be produced.

  In addition, if an inflow adjusting tank having an aeration device is disposed in the front stage of the first biological treatment tank, oxygen necessary for the treatment is sufficiently dissolved in the waste water before the treatment as described above. If the sedimentation tank that separates the sludge and the treated water through the aeration tank having the aeration apparatus is disposed after the second biological treatment tank, the treatment in the biological treatment tank is effectively performed. Moreover, ammonia nitrogen remaining in the wastewater can be oxidized and removed by supplying more sufficient oxygen to the wastewater after the secondary treatment discharged from the second biological treatment tank.

  According to the wastewater treatment method and apparatus of the present invention, microorganism treatment is performed even when high-concentration wastewater flows irregularly by first performing wastewater treatment in the first biological treatment tank in which the microorganism carrier is dispersed and arranged. The primary treatment that sufficiently lowers the BOD is performed without the body being blocked and unable to be treated, and the oscillating microorganism carrier carries the microorganisms in the first biological treatment tank after the primary treatment. By performing the treatment in the second biological treatment tank arranged more densely than the body, it is possible to stably perform the treatment for reducing the desired BOD.

  Hereinafter, each embodiment of the waste water treatment method and apparatus of the present invention will be described with reference to FIGS.

(First embodiment)
First, the 1st Embodiment of the waste water treatment method and apparatus of this invention is described with reference to FIG. 1, FIG. In FIG. 1, reference numeral 1 denotes an inflow adjusting tank into which drainage flows from a drainage source such as a food factory, and an aeration device 2 is disposed at the bottom thereof. The wastewater stored in the inflow adjusting tank 1 is supplied to the first biological treatment tank 4 by the pump 3.

  In the first biological treatment tank 4, the oscillating microorganism carrier 5 that supports the microorganism-carrying fiber body that carries the microorganisms for treating the waste water so as to oscillate so that a sufficient drainage flow space is formed between them. Are distributed. For the oscillating microorganism carrier 5 disposed in the first biological treatment tank 4, the length of the microorganism carrier fiber body is set to be relatively short to reduce the flow resistance in the drainage tank to prevent clogging. ing. At the bottom of the first biological treatment tank 4, an aeration apparatus 6 in which the air outlets 6 a are dispersedly arranged on the entire surface is disposed. An opening / closing gate 7 is provided at the outlet of the first biological treatment tank 4. After the drainage treatment is performed in the first biological treatment tank 4 for a required time, the inflow adjustment tank is opened by the pump 3 with the opening / closing gate 7 opened. By supplying an appropriate amount of waste water from 1, the waste water in the first biological treatment tank 4 is sequentially supplied to the second biological treatment tank 8.

  In the second biological treatment tank 8, an oscillating microorganism carrier 9, which swayably supports a microorganism-supporting fiber body carrying microorganisms for treating wastewater, is attached to the oscillating microorganism carrier 5 of the first biological treatment tank 4. Compared with the rocking microorganism carrier 5, the length of the microorganism-supporting fiber body is set relatively long. At the bottom of the second biological treatment tank 8, an aeration apparatus 10 in which the blast holes 10a and 10b are distributed over the entire surface is disposed. The fumarole 10b is disposed in the vicinity of the outlet of the second biological treatment tank 8, and the fumarole 10a is other than that.

  The waste water after being treated in the second biological treatment tank 8 is configured to flow out to the aeration tank 12 through the overflow weir 11 which is an outlet. As shown in FIG. 2, the overflow weir 11 is arranged on the opposite side to the open / close gate 7 which is the inlet of the second biological treatment tank 8 in plan view so that the drainage does not short pass. It is configured. Air is ejected at a high intensity from the air outlet 6a of the aeration apparatus 6 of the first biological treatment tank 4 and the air outlet 10a of the aeration apparatus 10 of the second biological treatment tank 8, and from the air outlet 10b of the aeration apparatus 10 thereby. It is configured such that air is ejected at a low strength, and the drainage flow is not greatly disturbed in the vicinity of the overflow weir 11 at the outlet of the second biological treatment tank 8, and the treated wastewater is stably discharged. ing. At the bottom of the aeration tank 12, an aeration device 13 in which the air outlets 13 a are dispersedly arranged over the entire surface is disposed, and air is ejected from the air outlet 13 a at a low intensity in the same manner as the air outlet 10 b of the aeration device 10. It is configured as follows.

  The waste water that has been subjected to the final aeration treatment in the aeration tank 12 is sent to a precipitation tank 15 by a pump 14, and activated sludge composed of microorganisms floating in the waste water is settled and separated in this precipitation tank 15 and purified. Water is discharged. The activated sludge separated in the settling tank 15 is sent to the activated sludge crushing device 16 and the lump is crushed and then sent to the membrane separation device 17. The separated water is refluxed to the inlet of the aeration tank 12 to activate the activated sludge. Sludge is added to the wastewater and reused at the inlets of the first biological treatment tank 4 and the second biological treatment tank 8.

  In the wastewater treatment apparatus having the above-described configuration, even if high-concentration wastewater is discharged irregularly, the wastewater flows into the inflow adjustment tank 1 to adjust the inflow according to the subsequent wastewater treatment capacity. Since the oxygen required for the treatment is sufficiently dissolved in the wastewater in the aeration apparatus 2 while waiting in the inflow adjusting tank 1, the subsequent wastewater treatment in the first biological treatment tank 4 is effectively performed. In the first biological treatment tank 4, the oscillating microorganism carrier 5 is arranged in a dispersed manner, so that even when high-concentration wastewater is supplied, the oscillating microorganism carrier 5 is blocked and cannot be treated. Therefore, the primary process for sufficiently reducing the BOD is performed.

  Next, the wastewater after the primary treatment is supplied to the second biological treatment tank 8, and is arranged more densely than the first biological treatment tank 4, and the length of the microorganism-supporting fibrous body is long. By being treated at 9, the wastewater treatment can be performed stably and efficiently, and the desired BOD can be reduced.

  Thereafter, the waste water after the secondary treatment is aerated in the aeration tank 12 having the aeration apparatus 13, so that sufficient oxygen is supplied to the waste water after the secondary treatment discharged from the second biological treatment tank 8. Therefore, it is possible to oxidize and remove the ammonia nitrogen remaining in the waste water, and after that, it is separated into activated sludge and clean treated water in the sedimentation tank 15, the treated water is discharged, and the activated sludge is crushed and reused. can do.

(Second Embodiment)
Next, a second embodiment of the wastewater treatment method and apparatus of the present invention will be described with reference to FIG. In the following description of the embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only differences are described.

  In the first embodiment, the example in which the oscillating microbial support 5 having the microbial support fiber body having a relatively short length is dispersed and arranged in the first biological treatment tank 4 is shown. In this embodiment, instead of the oscillating microorganism carrier 5, a hydrophilic sponge 18 having a porous structure and a large surface area is slidably accommodated in the first biological treatment tank 4, and the hydrophilic sponge 18 is allowed to float. It is configured to function as a free microorganism carrier. Further, a net screen 19 is disposed at the outlet of the first biological treatment tank 4 in front of the open / close gate 7 in order to prevent the hydrophilic sponge 18 from flowing out.

  Also in the present embodiment, the hydrophilic sponge 18 functions in the same manner as the oscillating microorganism carrier 5, thereby providing the same operational effects as the first embodiment.

(Third embodiment)
Next, a third embodiment of the waste water treatment method and apparatus of the present invention will be described with reference to FIG.

  In the first embodiment, the oscillating microorganism carrier 5 having a microorganism carrier fiber body whose length is set to be relatively short is dispersed and arranged in the first biological treatment tank 4, and the second embodiment. In the above embodiment, the hydrophilic sponge 18 is slidably accommodated in the first biological treatment tank 4. However, in this embodiment, both the swinging microorganism carrier 5 and the hydrophilic sponge 18 are treated in the first biological treatment tank 4. It is accommodated in the tank 4.

  Also in the present embodiment, both the swinging microorganism carrier 5 and the hydrophilic sponge 18 function in the same manner, so that the same operational effects as those of the first and second embodiments can be obtained.

  In the wastewater treatment method and apparatus of the present invention, the microbial carrier can be treated even when a high concentration of wastewater flows in irregularly by first performing wastewater treatment in the first biological treatment tank in which the microbial carrier is dispersed and arranged. The primary treatment for sufficiently lowering the BOD is performed without being blocked and unable to be treated, and the oscillating microorganism carrier is supplied from the microorganism carrier in the first biological treatment tank to the waste water after the primary treatment. Wastewater from food factories, etc. where high concentration of wastewater is discharged irregularly by treating in a densely arranged second biological treatment tank, so that the treatment to lower the desired BOD can be performed stably. It can apply suitably to the process of.

The block diagram of the waste water treatment equipment of the 1st Embodiment of the present invention. The top view which showed typically the principal part structure of the embodiment. The block diagram of the waste water treatment equipment of the 2nd Embodiment of this invention. The block diagram of the waste water treatment equipment of the 3rd Embodiment of this invention. The typical fracture | rupture perspective view of the waste water treatment equipment of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inflow adjustment tank 2 Aeration apparatus 4 1st biological treatment tank 5 Oscillating microorganism support body 8 2nd biological treatment tank 9 Oscillating microorganism support body 12 Aeration tank 13 Aeration apparatus 15 Precipitation tank 18 Hydrophilic sponge (microorganism support body)

Claims (6)

  Wastewater after the primary treatment is performed by supplying the wastewater to the first biological treatment tank in which the oscillating or movable microorganism carrier supporting the microorganisms for treating the wastewater is dispersed and arranged in the tank. Is supplied to the second biological treatment tank in which the oscillating microorganism carrier supporting the microorganism-carrying fiber body supporting the microorganisms so as to be capable of rocking is arranged more densely than the microorganism carrier in the first biological treatment tank. Waste water treatment method characterized by performing treatment.   The wastewater treatment method according to claim 1, wherein the wastewater is supplied from an inflow adjusting tank having an aeration device to the first biological treatment tank.   The wastewater treatment method according to claim 1, wherein the wastewater after the secondary treatment is aerated in an aeration tank having an aeration apparatus and then separated into sludge and treated water in a sedimentation tank.   A first biological treatment tank in which oscillating or movable microbial carriers supporting microorganisms for treating wastewater are dispersed and arranged in the tank, and a oscillating support for supporting the microorganism-supporting fibrous bodies supporting the microorganisms. A wastewater treatment apparatus comprising: a second biological treatment tank in which a moving microorganism carrier is arranged more densely than a microorganism carrier in the first biological treatment tank.   The wastewater treatment apparatus according to claim 4, wherein an inflow adjusting tank having an aeration device is disposed in a front stage of the first biological treatment tank.   The wastewater treatment apparatus according to claim 4, wherein a sedimentation tank for separating sludge and treated water is disposed downstream of the second biological treatment tank through an aeration tank having an aeration apparatus.

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