JP2013017946A - Anaerobic treatment apparatus and waste water treatment system provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anaerobic treatment apparatus that can improve purification ability for organic waste water, and a waste water treatment system provided with the anaerobic treatment apparatus.SOLUTION: The anaerobic treatment apparatus 2 composing the waste water treatment system 1 mainly comprises a feed tank 21 storing organic waste water, and a reactor 22 for performing anaerobic treatment of organic waste water, connected to the feed tank 21 by a supply pipe 201 and a drain pipe 202. A supply pump 212 for supplying the organic waste water to the reactor 22 is connected to the supply pipe 201. A large number of carriers 223 are filled in the reactor 22. Anaerobic microorganisms for performing the anaerobic treatment of organic waste water are adhered to each carrier 223.

Description

  The present invention relates to an anaerobic treatment apparatus that performs purification treatment of organic wastewater discharged from a food factory and the like, and a wastewater treatment system including the same.

  The current mainstream of industrial wastewater treatment is a combination of aerobic biological treatment (activated sludge) and physicochemical treatment such as coagulation sedimentation at the latter stage of biological treatment. In these treatment methods, there are problems such as a large electrical cost for aeration, a chemical cost for a flocculant, and a large amount of biological surplus / aggregated sediment sludge generated as waste.

  As a breakthrough for this problem, for wastewater discharged from food factories and the like, anaerobic typified by the UASB (Upflow Anaerobic Sludge Bed) method, which skillfully utilizes the self-immobilizing action of anaerobic microorganisms. The energy treatment method has become widespread, realizing energy saving and energy creation (biogas recovery).

Tadashi Takawa, “Anaerobic treatment of chemical wastewater”, Environmental Technology, Environmental Technology Society, June 2004, Vol. 33, No. 6, p. 432-436

  However, the UASB method, which has unrivaled success as an anaerobic treatment, has been confirmed to be accustomed to decomposition for wastewater containing substances that inhibit anaerobic microorganisms, such as chemical wastewater. However, there is a problem in the long-term growth and retention of granular sludge (microorganism agglomerates), which is the success or failure of the UASB method, and abandon energy-saving anaerobic treatment for many chemical wastewaters There are many examples.

  This is due to the fact that the formation of granule sludge depends on the self-immobilization ability of microorganisms itself, whereas chemical wastewater contains inhibitory / toxic substances that lower them relatively. This is because it is difficult to maintain a stable state for a long period of time.

  In food wastewater, for example, soy sauce concentrated waste liquid generated when producing soy sauce contains high concentrations of oil, salt, and suspended solids that inhibit granulated sludge. Conventional technologies (UASB) Act) could not cope.

  This invention is made | formed in view of such a conventional subject, and it aims at providing the anaerobic processing apparatus which can improve the purification processing capability of organic wastewater, and a wastewater treatment system provided with the same. .

  As a result of intensive studies, the present inventors have adopted the following anaerobic treatment devices and wastewater treatment systems in order to solve the above problems.

The anaerobic treatment apparatus of the present invention is an anaerobic treatment apparatus that performs anaerobic treatment of organic waste water.
A feed tank for temporarily storing the organic waste water;
A reactor connected to the feed tank by a supply pipe and a drain pipe;
A supply pump connected to the supply pipe and sending organic wastewater in the feed tank to the reactor;
The reactor is filled with a large number of carriers, and anaerobic microorganisms for purifying the organic wastewater are attached to each carrier.

  Here, the anaerobic treatment apparatus of the present invention preferably includes a heating means for setting the temperature of the organic wastewater stored in the feed tank to a temperature at which the anaerobic microorganisms are activated.

  Each carrier is preferably formed mainly from a sponge. On the other hand, the anaerobic microorganisms are preferably attached to the respective carriers by driving the supply pump and circulating the slurry containing the anaerobic microorganisms between the feed tank and the reactor for a predetermined period.

  Moreover, it is preferable that the anaerobic treatment apparatus of the present invention includes a sprinkling means for sprinkling water when supplying organic wastewater from the supply pipe into the reactor.

  Moreover, it is preferable to comprise a watering means from a watering pipe. Specifically, a supply pipe is connected to both ends of the water spray pipe, and a plurality of water spray holes for spraying the organic waste water supplied from the supply pipe into the reactor are provided.

The wastewater treatment system of the present invention is
An anaerobic treatment apparatus of the present invention;
A post-treatment device that is connected to a feed tank of the anaerobic treatment device by a treatment water pipe and purifies the anaerobic treatment water supplied from the anaerobic treatment device through the treatment water pipe.

  In the anaerobic treatment apparatus of the present invention, a feed tank and a reactor are connected by a supply pipe and a drain pipe, a supply pump is connected to the supply pipe, and the reactor is filled with a large number of carriers attached with anaerobic microorganisms. Thereby, when the supply pump is driven, the organic wastewater circulates between the feed tank and the reactor, and the polluted components in the organic wastewater are decomposed by the anaerobic microorganisms. Therefore, since the anaerobic treatment apparatus of the present invention does not require granule sludge unlike the conventional anaerobic treatment using the UASB method, the wastewater has a high concentration of oil, salt, and floating that inhibit granule sludge formation. Anaerobic treatment can be performed even if substances are included. Therefore, the anaerobic treatment apparatus of the present invention can enhance the purification treatment capacity of organic wastewater. Further, in the wastewater treatment system of the present invention, the organic wastewater is purified by the anaerobic treatment device and the post-treatment device of the present invention, so that the purification efficiency of the organic wastewater can be increased.

It is a block diagram of the wastewater treatment system which shows one embodiment of this invention. It is a perspective view of the upper surface of the reactor of the embodiment. It is a photograph which shows the support | carrier of the same embodiment. It is a photograph which shows the state with which the microorganisms adhered to the support | carrier of the embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a wastewater treatment system 1 showing an embodiment of the present invention. This wastewater treatment system 1 purifies organic wastewater discharged from a food factory or the like, and includes an anaerobic treatment device 2 and a post-treatment device 3 connected to a subsequent stage of the anaerobic treatment device 2. Yes.

  The anaerobic treatment apparatus 2 purifies organic wastewater using anaerobic microorganisms. The anaerobic treatment apparatus 2 includes a feed tank 21 that temporarily stores organic wastewater, and a reactor 22 that is connected to the feed tank 21 via a supply pipe 201 and a drain pipe 202 and anaerobically treats organic wastewater. It is structured around.

  The feed tank 21 has a partition plate 21c installed therein, and a raw water tank 21a and a treated water tank 21b are formed by the partition plate 21c. The lower part of the partition plate 21c is not connected to the inner bottom surface of the feed tank 21, and the raw water tank 21a and the treated water tank 21b are opened at the lower part.

  An adjustment tank 23 is connected to the raw water tank 21a through a waste water pipe 203. In this adjustment tank 23, water is added to the waste or organic waste water having a high concentration is diluted to generate organic waste water having a concentration suitable for purification treatment. A dilution water tank 24 is connected to the adjustment tank 23 via a dilution water pipe 204. In the dilution water tank 24, water (dilution water) for adding water to the waste put in the adjustment tank 23 or diluting organic waste water having a high concentration is stored. The dilution water pipe 204 is connected to a flow rate control valve 204a. The flow rate control valve 204a adjusts the flow rate of the dilution water sent from the dilution water tank 24 to the adjustment tank 23. This diluting water is not limited to tap water and industrial water, but it is also possible to reuse low-concentration wastewater from different systems, treated water from existing wastewater treatment facilities, and the like.

  Further, a waste water pump 203a is connected to the waste water pipe 203. This waste water pump 203a sends the organic waste water whose concentration is adjusted in the adjustment tank 23 to the raw water tank 21a.

  A stirrer 211 is disposed in the raw water tank 21a. The stirrer 211 stirs the organic waste water in the raw water tank 21a. Further, a heater or the like (not shown) that is a heating means is disposed in the raw water tank 21a. This heater sets the temperature of the organic waste water in the raw water tank 21a to a temperature at which anaerobic microorganisms are activated. Note that the heating means is not limited to a heater, and may be, for example, one using steam or one using heat exchange.

  Further, the post-treatment device 3 is connected to the treated water tank 21b via the treated water pipe 301. This post-treatment device 3 further purifies the anaerobic treated water supplied from the treated water tank 21b via the treated water pipe 301. In this post-processing apparatus 3, anaerobic processing, aerobic processing, physicochemical processing (coagulation precipitation processing, etc.) etc. are performed.

  A supply pump 212 is connected to the supply pipe 201. The supply pump 212 sends the heated organic waste water (raw water A) to the reactor 22. The drain pipe 202 is connected to the bottom of the reactor 22 and the feed tank 21.

  A water seal tank 25 is connected to the upper part of the reactor 22, and a gas meter 26 is connected to the water seal tank 25.

  The reactor 22 is formed in a cylindrical shape, and an opening 221 is formed on the upper surface thereof as shown in FIG. A plurality of water spray pipes 222 are attached to the peripheral edge 221 a of the opening 221.

  More specifically, in the present embodiment, a plurality of water spray pipes 222 intersect with each other in a cross shape and are joined using a cross-shaped joint member 230. In this state, each sprinkling pipe 222 is attached through the peripheral wall 22a of the reactor 22 across the peripheral edge 221a of the opening 221. The joint member 230 is formed in a cross shape by joining another tube to a T-shaped tube. In the present embodiment, the plurality of sprinkling pipes 222 are arranged so as to cross each other in a cross shape, but the bent portions of the plurality of L-shaped watering pipes may be arranged close to each other.

  A supply pipe 201 is connected to both ends of each water spray pipe 222 as shown in FIG. Note that a flow rate control valve 212 a is connected in the vicinity of the connection portion of the supply pipe 201 with the water spray pipe 222. This flow control valve 212a adjusts the degree of water spray (flow rate of raw water A) so that water is evenly sprayed from each water spray pipe 222.

  In addition, as shown in FIG. 2, a plurality of water spray holes 222 a are provided below each water spray pipe 222. The water sprinkling holes 222 a are used for sprinkling raw water A (organic waste water) supplied from the supply pipe 201 into the reactor 22.

  The reactor 22 is filled with a large number of carriers 223. As shown in FIG. 3, the carrier 223 includes a carrier body 223a formed of a sponge and a plastic mesh ring 223b fitted into the carrier body 223a. The carrier body 223a is formed in a 3 cm × 3 cm cube, for example. Each carrier 223 has anaerobic microorganisms C for anaerobic treatment of organic wastewater as shown in FIG.

  As shown in FIG. 1, a net 224 is disposed in the lower portion of the reactor 22 in order to support a large number of filled carriers 223 and prevent the drainage pipe 202 from clogging the carriers 223. Between the net 224 and the inner bottom surface of the reactor 22, a water collection space S is formed for collecting anaerobic treated water obtained by anaerobically treating organic wastewater with a number of carriers 223.

  Further, as shown in FIG. 2, in the reactor 22, a plurality of lower diffusion sheets 225, an intermediate member 226, and an upper diffusion sheet 227 are interposed between a plurality of water spray pipes 222 and a large number of carriers 223. Has been placed. In the present embodiment, plastic turf sheets are used for these members 225 to 227.

  The plurality of lower diffusion sheets 225 are each formed in an elongated rectangular shape, and are placed on a large number of carriers 223 in a crossing manner. The intermediate member 226 is arranged such that an artificial turf sheet rounded into a cylindrical shape is erected on the intersection of the lower diffusion sheet 225. The upper diffusion sheet 227 is formed in a quadrangular shape, and the central portion is placed on the intermediate member 226. Accordingly, the upper diffusion sheet 227 is disposed so as to hang down with the intermediate member 226 as a vertex.

  In addition, the plurality of water spray pipes 222 are arranged such that the joint member 230 is located above the central portion of the upper diffusion sheet 227 and a gap is formed between the upper diffusion sheet 227 and the joint member 230.

  Next, in the wastewater treatment system 1 configured as described above, purification treatment of organic wastewater will be described.

  First, the wastewater pump 203a is driven to put a predetermined amount of organic wastewater whose concentration is adjusted into the raw water tank 21a of the feed tank 21 from the adjusting tank 23.

  Next, a heater or the like (not shown) is driven to raise the temperature of the organic waste water to a temperature at which the anaerobic microorganisms C are activated, thereby obtaining raw water A. Further, the stirrer 211 is driven to stir the raw water A. Next, the supply pump 212 is driven, and the raw water A is sent to each sprinkling pipe 222 through the supply pipe 201. Each sprinkling pipe 222 sprinkles raw water A into the reactor 22 through a sprinkling hole 222a.

  The raw water A sprinkled in the reactor 22 flows downward in the reactor 22. At this time, the raw water A comes into contact with the carrier 223 filled in the reactor 22, and the pollutant components in the raw water A are decomposed by the anaerobic microorganisms C attached to the carrier 223, and the anaerobic treated water B. Become.

  Anaerobic treated water B is sent into the treated water tank 21b of the feed tank 21 via the drain pipe 202 and mixed with the raw water A temporarily stored in the raw water tank 21a. This mixed water is sprayed again into the reactor 22 through the supply pipe 201 and decomposed by the anaerobic microorganism C to become anaerobic treated water B. This anaerobic treated water B is sent to the treated water tank 21b of the feed tank 21 through the drain pipe 202, and is again decomposed by the anaerobic microorganism C as described above.

  As described above, in the anaerobic treatment apparatus 2 according to the present embodiment, the organic wastewater is circulated between the feed tank 21 and the reactor 22 for a predetermined period, and the contaminated components in the organic wastewater are decomposed by the anaerobic microorganisms C. Therefore, unlike the conventional UASB method, granule sludge is not required, so even if organic wastewater contains high concentrations of oil, salt, and suspended solids that inhibit granulation sludge, anaerobic treatment can be performed. It becomes possible. Therefore, the anaerobic processing apparatus 2 of this Embodiment can improve anaerobic processing capability.

  In addition, the anaerobic treated water B sent into the treated water tank 21b is sent to the post-treatment device 3 through the treated water pipe 301 and purified for the same amount as the amount of organic wastewater supplied into the raw water tank 21a. The Therefore, the wastewater treatment system 1 of the present embodiment purifies the organic wastewater by the anaerobic treatment device 2 and the post-treatment device 3, so that the purification treatment efficiency of the organic wastewater can be increased.

  In addition, the anaerobic treatment apparatus 2 of the present embodiment includes a heating means (a heater or the like) that sets the temperature of the organic waste water in the raw water tank 21a to a temperature at which the anaerobic microorganism C is activated. Thereby, since the decomposition efficiency of organic wastewater increases, anaerobic processing capability can further be improved.

  In addition, the anaerobic treatment apparatus 2 of the present embodiment includes water sprinkling means (a plurality of water spray pipes 222) that sprinkle water when supplying organic wastewater from the supply pipe 201 into the reactor 22. Therefore, compared with the case where the organic waste water is simply put into the reactor 22, it is possible to contact more carriers 223, so that the decomposition efficiency of the organic waste water is increased and the anaerobic treatment capacity can be further increased.

  Moreover, in the anaerobic processing apparatus 2 of this Embodiment, since the some sprinkling pipe 222 was used as a watering means of this invention, manufacturing cost can be held down. Moreover, you may attach each watering pipe 222 to the reactor 22 so that attachment or detachment is possible. In this case, the sprinkling pipe 222 can be easily removed when the carrier 223 is taken in and out of the reactor 22 or when the inside of the reactor 22 is cleaned or inspected, so that the work efficiency can be increased. . In addition, the use number of the watering pipe 222 is not specifically limited. Further, the arrangement position of the water spray pipe 222 may be arranged in any manner as long as it is arranged with a gap above the upper diffusion sheet 227. Moreover, as a watering means, you may use a watering apparatus like a sprinkler other than the watering pipe 222, for example.

  Further, in the anaerobic treatment device 2 of the present embodiment, the upper diffusion sheet 227, the intermediate member 226, and the lower diffusion sheet 225 are sequentially disposed below the plurality of sprinkling pipes 222. As a result, the organic waste water sprayed into the reactor 22 from the water spray pipe 222 flows from the upper diffusion sheet 227 into the reactor 22 via the lower diffusion sheet 225. Therefore, since it becomes possible to make organic wastewater contact many carriers 223, the decomposition efficiency of organic wastewater can be improved more and anaerobic processing capability can further be improved.

  Furthermore, in the anaerobic treatment apparatus 2 of the present embodiment, the upper diffusion sheet 227 is arranged to hang down with the intermediate member 226 as a vertex using the intermediate member 226, and the lower diffusion sheet 225 is disposed on the inner surface of the peripheral wall of the reactor 22. It formed so that it might extend toward. As a result, the organic waste water sprayed into the reactor 22 from the sprinkling pipe 222 can reach the inner surface of the peripheral wall 22 a of the reactor 22. Therefore, it becomes possible to contact the organic waste water with more carriers 223, further improving the decomposition efficiency of the organic waste water, and further improving the anaerobic treatment capacity.

  In the anaerobic treatment apparatus 2 of the present embodiment, the intermediate member 226 is formed in a cylindrical shape using a plastic artificial grass sheet, but the material (material) and shape of the intermediate member are diffused upward. As long as the sheet 227 hangs down, the present embodiment is not necessarily limited.

  In the carrier 223 of the present embodiment, a ring 223b is fitted into a sponge carrier body 223a. Since the shape of the carrier main body 223a is maintained by the ring 223b, it is possible to prevent the reactor 22 from being crushed by its own weight and being closed up even if the carrier 223 is stacked in the reactor 22 at a high level.

  In order to attach the anaerobic microorganism C to the carrier 223, the following method is preferably used. This adhesion work is performed before the start-up of the organic wastewater purification treatment. First, a new carrier 223 is immersed in water and then charged into the reactor 22 for filling.

  Since the carrier 223 is mainly formed of a sponge, it has excellent water retention, but when it is new, it is hydrophobic and repels water. As an effective filling method, it is preferable to immerse a new carrier 223 in tap water while performing vibration such as agitation so that the water is sufficiently absorbed to the inside and then put into the reactor 22.

  Next, the slurry containing the anaerobic microorganism C is put into the raw water tank 21 a of the feed tank 21. This slurry is obtained by dispersing an anaerobic seed sludge finely pulverized in tap water. Next, the supply pump 212 is driven to spray the slurry in the raw water tank 21 a into the reactor 22 through the supply pipe 201 and the water spray pipe 222. At this time, the waste water pump 203a is not driven, and the flow control valve 204a of the dilution water is also closed. Further, in order to prevent the treated water from flowing from the treated water tank 21 b to the aftertreatment device 3, the treated water pipe 301 is removed and the connection port between the treated water pipe 301 and the treated water tank 21 b is plugged, or the treated water pipe 301 is opened and closed. A valve is provided, and the treated water pipe 301 is closed with this on-off valve.

  The slurry sprinkled in the reactor 22 flows downward in the reactor 22. At this time, the slurry contacts the carrier 223 filled in the reactor 22, and a part of the anaerobic seed sludge (anaerobic microorganism C) in the slurry adheres to the carrier 223.

  The slurry to which the anaerobic microorganism C adheres is sent into the treated water tank 21b of the feed tank 21 through the drain pipe 202 and moves to the raw water tank 21a. The slurry that has moved to the raw water tank 21 a is again sprinkled in the reactor 22, and after the anaerobic microorganisms C adhere to the carrier 223, it is sent to the treated water tank 21 b of the feed tank 21.

  As described above, the anaerobic microorganism C is attached to a large number of carriers 223 by circulating the slurry between the feed tank 21 and the reactor 22 for a predetermined period. Therefore, anaerobic microorganisms C can be efficiently attached to a large number of carriers 223, so that the time required for attaching the anaerobic microorganisms C can be shortened. Note that the anaerobic microorganism C may be mixed with soil microorganisms and adhered to the carrier 223.

  As mentioned above, although embodiment concerning this invention was illustrated, this embodiment does not limit the content of this invention. Various modifications can be made without departing from the scope of the claims of the present invention.

  As described above, the anaerobic treatment device and the wastewater treatment system of the present invention can enhance the purification treatment capacity of organic wastewater. Therefore, the anaerobic treatment apparatus and the wastewater treatment system of the present invention can be sufficiently utilized in the technical fields of the anaerobic treatment apparatus and the wastewater treatment system.

DESCRIPTION OF SYMBOLS 1 Waste water treatment system 2 Anaerobic treatment apparatus 3 Post-treatment apparatus 21 Feed tank 22 Reactor 201 Supply pipe 202 Drain pipe 212 Supply pump 222 Sprinkling pipe 222a Sprinkling hole 223 Carrier 301 Treated water pipe C Anaerobic microorganism

Claims (6)

In anaerobic treatment equipment that performs anaerobic treatment of organic wastewater,
A feed tank for temporarily storing the organic waste water;
A reactor connected to the feed tank by a supply pipe and a drain pipe;
A supply pump connected to the supply pipe and sending organic wastewater in the feed tank to the reactor;
An anaerobic treatment apparatus in which a large number of carriers are filled in the reactor, and anaerobic microorganisms for purifying the organic wastewater are attached to each carrier. In the anaerobic processing apparatus of Claim 1,
An anaerobic treatment apparatus comprising heating means for setting the temperature of the organic waste water stored in the feed tank to a temperature at which the anaerobic microorganisms are activated. In the anaerobic processing apparatus according to claim 1 or 2,
Each carrier is mainly formed of a sponge, and the anaerobic microorganisms drive each of the feed pumps to circulate a slurry containing the anaerobic microorganisms between the feed tank and the reactor for a predetermined period. An anaerobic treatment apparatus characterized by being attached to the surface. In the anaerobic processing apparatus of any one of Claims 1-3,
An anaerobic treatment apparatus comprising water sprinkling means for sprinkling the organic waste water when it is supplied from the supply pipe into the reactor. In the anaerobic processing apparatus of Claim 4,
The watering means is composed of a watering pipe attached so as to straddle the periphery of the opening formed on the upper surface of the reactor, and the water supply pipe is connected to the supply pipe at both ends and the supply pipe An anaerobic treatment apparatus comprising a plurality of water spray holes for spraying the organic waste water supplied from the inside into the reactor. An anaerobic treatment device according to any one of claims 1 to 5,
A waste water treatment comprising: a post-treatment device connected to a feed tank of the anaerobic treatment device by a treatment water pipe and purifying the anaerobic treatment water supplied from the anaerobic treatment device through the treatment water pipe. system.