JP2611148B2 - Two-system parallel oxidation treatment facility - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treatment facility for purifying river water.

[0002]

2. Description of the Related Art In recent years, as the living environment of residents has been improved, water pollution of rivers has become a major social problem. In particular, domestic wastewater and organic industrial wastewater impair the self-cleaning capacity of rivers, and in addition to the increase in BOD and SS, recently the increase in nutrients (nitrogen, phosphorus, etc.) has significantly deteriorated water quality in closed water areas. It is.

Conventional methods for purifying river water include the following: (a) excavating a riverbed, paving with gravel, installing perforated pipes at regular intervals, backfilling the sediment, and using intake weirs to feed the river water through the perforated pipes. A method of contact oxidation between gravel that is introduced into the gravel layer, purifies the water of the river by the effect of adsorption and sedimentation and oxidation by the biofilm attached to the gravel and the gravel, and returns the water purified by the perforated drainage pipe to the river. (B) A method of purifying water quality by introducing a large amount of clean water from a clean river through a bypass to reduce the concentration of polluted water. (C) There is a method in which river water is introduced, sedimentation separation and biological oxidation are performed using DO in which plankton is generated, and the water is returned to the river.

[0004]

However, the method of contact oxidation between gravel (a) requires a wide riverbed and land, and mud generated by purification of the water quality between gravels becomes clogged with the passage of time. In addition, the method (b) has a problem in securing a water source, so that fundamental purification of water quality cannot be expected, and the cost of bypass is enormous due to soaring land, which is not practical.

[0005] Furthermore, the method using an oxidation pond (c) requires a long residence time, requires a large amount of land, and it is difficult to install an oxidation pond in an urban area. For this reason, a treatment facility using a separate treatment tank has been proposed, but there are difficulties in continuous operation and uniform homogenization of wastewater, and there is a problem in maintenance and continuous operation when sludge is drawn out.

The present invention has been proposed in view of the above-mentioned problems of the prior art, and it is an object of the present invention to provide a two-system parallel oxidation treatment facility which is easy to maintain and manage and has excellent processing capacity and workability. Is to do.

[0007]

In order to achieve the above object, a two-system parallel oxidation treatment facility according to the present invention is provided with a sand basin having a built-in coarse screen and SS removal screen, into which river water flows, and a sand basin. An anaerobic tank connected downstream of a sand settling tank and containing a synthetic fiber filter and a plastic contact material, and connected in series downstream of the anaerobic tank, each containing a plastic contact material and containing an aerobic microorganism A plurality of contact oxidation tanks arranged in two rows on the left and right, which are configured to perform biofilm oxidative decomposition treatment centered on
A two-row dephosphorization tank containing a filter medium having a high phosphoric acid absorption coefficient, and a filtration settling tank connected to the downstream side of the dephosphorization tank and having a multi-layer synthetic fiber filter built therein. An air supply pipe passing through the center line of the contact oxidation tank in one row of the contact oxidation tank is arranged, and a branch pipe whose tip opens from the same air supply pipe to the center bottom of each of the right and left contact oxidation tanks, An air supply pipe extending almost the entire length of the bottom of the dephosphorization tank from the rear end of the air supply pipe to the left and right is formed.

[0008]

Since the present invention is configured as described above,
From the river water flowing into the settling tank, large dust is removed by a coarse screen in the settling tank, and SS (floating substance) is captured and settled by the SS filter. Next, the treated water in the sand settling tank is subjected to an ammoniacal nitrification denitrification effect by anaerobic decomposition action, promotion of decomposition of sewage molecules, and preliminary filtration by a synthetic fiber filter in an anaerobic tank.

Next, the treated water is subjected to an oxidative decomposition treatment of a biofilm centering on aerobic microorganisms in each of the contact oxidation tanks. Thus, the BOD volume load was changed from the upstream side to the downstream side in the contact oxidation tank, and the contact oxidation tank
Simultaneous operation or switching operation, such as sludge extraction and adjustment of sewage retention time, becomes possible by being arranged in series. Thus, a branch pipe whose leading end is opened from the center of each contact oxidation tank of the one row to the center bottom of each contact oxidation tank of the one row of the air supply pipe passing through the center line of the contact oxidation tank of one row. By adopting the central aeration method of a natural flow type upward flow method, the substance in the tank is evenly attached to the plastic contact material in each of the tanks.

The sewage treated by the contact oxidation tank row enters into two rows of left and right dephosphorization tanks containing a filter medium having a high phosphoric acid absorption coefficient, and the branch portion of the air supply pipe extending substantially the entire length of the bottom of the tank. The phosphorus in the sewage is continuously adsorbed and fixed to the filter medium and removed by the entire aeration. The sewage treated in the dephosphorization tank as described above flows into a filtration and sedimentation tank in which a multi-layered synthetic fiber filtration filter is incorporated, and the SS in the sewage is finally removed and precipitated by the filter, whereby purified water is purified. can get.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. A is a sedimentation tank having a built-in coarse screen 1 and SS removal screen 2 and having a river water inflow pipe 3. Downstream of the sedimentation tank A, a pair of left and right anaerobic tanks B are continuously provided. One pair of left and right contact oxidation tanks downstream of B (first chamber)
C ₁ , contact oxidation tank (second chamber) C ₂ , contact oxidation tank (third chamber)
Chamber) C ₃ is continuously provided in series, said each contact oxidation tank plastic contact member 4 and the chemical fiber filtration filter 5 is incorporated.

Further, a dephosphorization tank D is provided downstream of the catalytic oxidation tank (third chamber) C ₃ so as to be capable of intermittent operation in accordance with its dephosphorization effect. Is provided with a filter medium 6 having a high phosphoric acid absorption coefficient, a filtration sedimentation tank E is provided downstream of the tank D, and upstream and downstream ends of the tank E are partitioned by a partition plate 8 on the upstream side of the tank E. A multi-layer synthetic fiber filtration filter 7 is built in, and a processing water tank F communicating with a processing water drain pipe 9 is provided downstream. In the figure, 10 is a cover plate, and 11 is grating.

The partition wall 12 of each tank is provided with a communication hole 12a. In the figure, reference numeral 13 denotes a partition plate, and reference numeral 14 denotes a kiln for facilitating the removal of sludge. FIG. 2 is a detailed view showing a state of the sludge reservoir accumulated in the same part. Further, even when the biofilm of the contact material is enlarged and the water permeability becomes poor, a constant flow rate can be maintained because the head difference Δh is provided for each tank as shown in FIG.

Reference numeral 15 denotes a blower provided in the control chamber 16. The tip of each of the contact oxidation chambers C ₁ , C ₂ , and C ₃ in the air supply pipe 17 connected to the blower 15 is located at the front end of the chamber. A vertical branch pipe 17 ′ opening near the bottom and an inverted L-shaped branch pipe 17 ″ opening near the bottom of the center of each contact oxidation chamber in the adjacent row are branched out. A pair of air supply pipes 18 extending from the ends to the lower bottom portion over substantially the entire length of the left and right dephosphorization tanks D. The reference numeral 19 in the figure denotes an open / close valve.

Since the illustrated embodiment is constructed as described above, coarse water is removed from the river water flowing into the sand settling tank A via the river inflow pipe 3 by the coarse screen 1 in the sand settling tank A. , SS filter 2 captures and precipitates SS. Next, the sewage enters the anaerobic tank B, where the ammonia nitrification and denitrification effect by the anaerobic decomposition action, the promotion of decomposition of the sewage molecules, and the preliminary filtration by the synthetic fiber plastic filter 5 are performed.

The treated water in the anaerobic tank B is subjected to oxidative decomposition of a biofilm, mainly aerobic microorganisms, in each of the contact oxidation tanks C ₁ , C ₂ , and C ₃ , and the BOD volume load is reduced. To the contact oxidation tanks C ₁ , C ₂ , C
₃ and the respective tanks C ₁ , C ₂ , C
₃ is arranged in two lines, sludge withdrawal, adjustment of sewage retention time, simultaneous operation of two lines, or switching operation are performed.

Further, an air supply pipe 18 passing through the center lines of the contact oxidation tanks C ₁ , C ₂ , and C _{3 in one} row via the blower 15.
When the air is supplied to the air, the air is supplied to the contact oxidation tanks in one row and the contact oxidation tanks C ₁ , C ₂ , and C _{3 in the} other row via branch pipes 17 ′ and 17 ″ branched from the air supply pipe 17. The central aeration method, which is spouted upward from the vicinity of the lower bottom of the center of the tank and uses a natural flow type upward flow method without using a pump in this way, allows the plastic contact material in the tank to be provided for each tank. 4, the substance in the tank is uniformly attached, and the wastewater in the tank is evenly and uniformly treated.

The sewage treated in the contact oxidation tanks C ₁ , C ₂ , C ₃ thus enters the right and left two rows of dephosphorization tanks D.
The pair of air supply pipes 18 extending substantially the entire length of the bottom of the tank D
By the aeration of the entire surface, phosphorus in the wastewater is continuously adsorbed and fixed to the filter medium 6 in the filter medium 6 having a high phosphoric acid absorption coefficient in the tank D and removed. In the wastewater treated in the dephosphorization tank D, SS in the wastewater is finally removed and precipitated by the multilayer synthetic fiber filter 7. The purified treated water thus obtained is drained to the treated water tank F via the drain pipe 9.

Since the contact oxidation tanks C ₁ , C ₂ , C ₃ and the dephosphorization tank D are arranged in two lines in parallel, the contact material filling rate changes, and the maintenance and management at the time of sludge withdrawal according to the target of the treated water quality. And so on.

[0020]

According to the present invention, as described above, an anaerobic tank, a plurality of contact oxidation tanks each containing a plastic contact material, are provided behind a river water inflow sedimentation tank containing a coarse screen and an SS removal screen. Since two dephosphorization tanks with built-in filter media with a high phosphoric acid absorption coefficient are installed in parallel, switching operations such as changes in the contact material filling rate and maintenance and management during sludge withdrawal can be performed according to the target water quality. It is possible and sustainability of river water purification can be maintained.

Further, an air supply pipe passing through the center line of the contact oxidation tank in one of the two rows of contact oxidation tanks is provided, and the tip of the air supply pipe is contact oxidation of one of the left and right contact oxidation tanks. An air supply pipe that passes through the center line of the tank is provided, and an air supply pipe that extends from the end of the air supply pipe to almost the entire length of the bottom of the dephosphorization tank on the left and right is drawn out, and all facilities are pumped from primary processing to filtration processing Because of the natural downflow type upward flow method that does not use sewage, uniform and homogeneous treatment of sewage can be performed for each tank.

In the present invention, the biota is diversified by using a plastic contact material having a large surface area and can be arranged at random as a contact material, and a coexistence state of aerobic and anaerobic microorganisms can be obtained. High purification effect can be obtained. In rivers in dense urban areas, it is difficult to secure land for the installation of purification facilities, but the treatment facility of the present invention is buried under parks and parking lots, etc.
There is no need to acquire a new site, and it is possible to set up a processing facility in a limited space.

Further, according to the present invention, as described above, by using a multi-chamber contact oxidation tank, it is possible to prevent short circuit and stabilize the quality of treated water. Further, according to the present invention, by changing the capacity of the contact oxidation tank, it is possible to equalize the BOD volume load of each tank and to prevent the contact material from being blocked. Furthermore, according to the present invention, by combining the two methods, the natural flow type upward flow method (water flow) and the central aeration method (aeration), the swirling flow is efficiently generated, and as a result, wastewater to be treated Can be diffused, and can be uniformly contacted with the contact material, so that the processing efficiency can be improved.

Further, according to the present invention, a sludge thickening tank and a sludge storage tank can be additionally installed as required, and the length, depth, and flow-down direction of the facility can be adjusted according to the inflow conditions and the land area of the wastewater. The scale can be adjusted, and the maintenance of facilities such as sludge withdrawal is easily performed. Further, according to the present invention, nutrients (TN, T-
Since the removal of P) is performed stepwise within the facility, the effect of removing the entire water quality is high, and the material constituting the facility can be selected from concrete and steel according to the site area and site conditions.

[Brief description of the drawings]

FIGS. 1 (a) and 1 (b) are a plan view and a longitudinal sectional view showing one embodiment of a two-system parallel oxidation treatment facility according to the present invention.

FIG. 2 is a longitudinal sectional view showing a state in which a sludge layer is retained in a tank.

FIG. 3 is a longitudinal sectional view showing a state in which a head difference is provided between adjacent tanks.

FIG. 4 is a water quality flow sheet of the treatment facility according to the present invention.

[Explanation of symbols]

A sand setting tank B anaerobic tank C ₁ contact oxidation tank (first chamber) C ₂ contact oxidation tank (second chamber) C ₃ contact oxidation tank (third chamber) D dephosphorization tank E filtration settling tank F treatment water tank 1 coarse screen 2 SS removal screen 3 River water inflow pipe 4 Plastic contact material 5 Synthetic fiber filter 6 Filter material with high phosphoric acid absorption coefficient 7 Synthetic fiber filter 8 Partition plate 9 Drain pipe 10 Cover plate 11 Grating 12 Partition wall 12a Communication hole 13 Partition plate 14 Kettle Field 15 Blower 16 Control room 17 Air supply pipe 17 'Branch pipe 17 "Branch pipe 18 Air supply pipe 19 Open / close valve

Claims (1)

(57) [Claims] 1. An anaerobic tank having a coarse screen and an SS removing screen, a sedimentation tank into which river water is introduced, an anaerobic tank connected to a downstream side of the sedimentation tank, and incorporating a synthetic fiber filter and a plastic contact material. A plurality of contact oxidation tanks arranged in two rows on the left and right, which are serially connected downstream of the anaerobic tank, each of which incorporates a plastic contact material and is configured to perform biofilm oxidative decomposition treatment centering on aerobic microorganisms. A dephosphorization tank in two rows, left and right, in which a filter medium having a high phosphoric acid absorption coefficient is installed, and a multi-layer synthetic fiber filtration filter, which is continuously installed downstream of the dephosphorization tank. Is provided with an air supply pipe passing through the center line of the contact oxidation tank in one of the two rows of contact oxidation tanks. A branch pipe opening at the center bottom A two-system parallel oxidation treatment facility, characterized in that an air supply pipe extending substantially the entire length of the bottom of the left and right dephosphorization tank from the end of the air supply pipe is provided.