JPH09174076A - Water treatment device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the clogging of a packing material in a water treatment device applying purifying treatment to the water to be treated by bringing the water to be treated into contact with the packing material in a plurality of treatment tanks while passing the same through the respective treatment tanks. SOLUTION: Respective treatment tanks 2-9 are partitioned so that the upstream parts thereof and the underside parts of the bottom surfaces thereof become exclusive water passing parts 14, 17... to provide packing parts 13, 16... in the respective treatment tanks and the packing parts are packed with a packing material, and water to be treated (continuous arrow) in allowed to flow in the respective treatment tanks as the falling streams flowing to the water passing parts from above to below and allowed to flow in the packing parts as rising streams flowing upwardly from the water permeable bottom surfaces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water treatment device that enables a relatively high degree of purification treatment.

[0002]

2. Description of the Related Art The present applicant has previously filed Japanese Patent Application No. 5-16834.
A water treatment device was proposed as No. 9 (JP-A-7-983). This water treatment device is, from the upstream side to the downstream side, for example, a pretreatment tank filled with a porous filter medium made of plastic, a denitrification tank filled with assimilated material and an adsorbent, a chitosan charcoal tank filled with chitosan charcoal, and phosphorus. A dephosphorization tank filled with an adsorbent for adsorption and a finishing tank filled with charcoal are continuously provided, and the water to be treated is passed through each of these tanks in a descending and ascending flow repeatedly, and the filler in each treating tank. It is highly suitable for advanced purification of polluted water under pollutant load conditions such as in small rivers where household wastewater is drained as it is.

Such a water treatment device has already been installed as a practical device in some rivers and the like and exhibits its excellent purification ability. However, it has become clear that an unexpected phenomenon occurs when collecting operating data and the like for these devices. That is, after a certain period of time from the start of operation, the actual processing efficiency becomes lower than the calculated one.

[0004] Therefore, when pursuing this, unexpected filling of the packing material occurs in some tanks, and even if the packing material does not clog, the contact efficiency of the water to be treated with the packing material is lower than the calculation. In some cases, it was found that these were the causes of the reduced efficiency. Therefore, we further analyzed the mechanism of this clogging phenomenon and the phenomenon that the contact efficiency with the packing material decreases, and found that clogging easily occurs when the water to be treated flows into the packing material layer in a downward flow. It was clarified that the flow of water is uneven in the filler layer, and a blind spot portion of the flow is generated in which the flow is stopped, and this is a factor that reduces the contact efficiency.

[0005]

The present invention has been made on the basis of such knowledge, and basically, a state in which the water to be treated flows in a downward flow into the filling material filled in each tank It is an object of the present invention to provide a water treatment device capable of effectively preventing clogging of the filler by eliminating it. Another object of the present invention is to provide a water treatment device capable of increasing the contact efficiency of water to be treated with the filler by eliminating uneven distribution of water in the filler layer.

[0006]

A water treatment apparatus according to the present invention is provided with a plurality of treatment tanks each filled with a different filling material in order from the upstream side to the downstream side, and treats water to be treated with these treatment tanks. Basically, it passes through the tank and makes contact with the filler there to carry out a purification treatment.In addition to this, in each processing tank, the upstream side and the bottom side of the bottom side are dedicated water passage parts. The container is partitioned and a filling part is provided, and the filling material is filled in the filling part. Then, the water to be treated is made to flow into each water passage part in a downward flow flowing from the upper side to the lower side of each water passing part. The filling portion is made to flow upward from the water-permeable bottom surface.

[0007] In this water treatment device, the inflow of the water to be treated into each treatment tank is exclusively used for the passage of water, that is, the descent in the water passage portion where there is no substantial water flow resistance without filling with a filler or the like. The flow is carried out in a flowing manner, and the filling material layer is always made to flow in an ascending flow with less clogging. Therefore, the clogging of the filler can be effectively prevented.

According to the present invention, in such a water treatment apparatus, one or a plurality of weir walls are provided in the filling section for giving the flow of water to be treated in the filling section a meandering flow up and down. ing.

By doing so, it is possible to eliminate the unevenness of water flow in the packing material layer and substantially eliminate the blind spots of the flow, and it is possible to improve the contact efficiency of the water to be treated with the packing material.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIGS. 1 and 2, a water treatment apparatus according to an embodiment of the present invention includes a first treatment tank 1, a second treatment tank 2, and a third treatment tank from the upstream side to the downstream side. The treatment tank 3, the fourth treatment tank 4, the fifth treatment tank 5, the sixth treatment tank 6, the seventh treatment tank 7, the eighth treatment tank 8, and the ninth treatment tank 9 are continuously provided. Each of these processing tanks is formed by partitioning an elongated box body formed by concrete casting in the ground by a partition wall 10.

The first treatment tank 1 is a primary settling tank which mainly removes large suspended solids, and does not use a filler or the like, but a rectifying cylinder 11 or 1 for adjusting retention of water to be treated.
Only set 2.

The second treatment tank 2 is a secondary precipitation tank which mainly removes suspended matters which cannot be removed by the first treatment tank 1.
The filling section 13 is formed by being surrounded by a water-permeable bottom surface B and a non-water-permeable partition wall W, and is arranged along the upstream side surface and the bottom surface B (not shown in FIG. 2) of the filling section 13. Then, the water passage portion 14 dedicated to water passage is provided. The filling section 13
In this case, a weir wall 15 for giving a water to be treated a meandering flow as schematically shown by continuous arrows in the figure is provided at an intermediate position, and a contact filter medium (not shown) made of, for example, a plastic material is used. To fill. Further, in the second processing tank 2, an aeration pump P for performing necessary aeration after the third processing tank is installed, and an air supply pipe (not shown) is extended from the aeration pump P.

The third treatment tank 3 is a denitrification tank which mainly performs denitrification treatment, and like the second treatment tank 2, a filling section 16 and a water passage section 17 are provided. The filling part 16 is provided with weir walls 16a, 16b, 16c for meandering flow, and for assimilation of microorganisms, for example, assimilation material using waste wood of shiitake mushrooms and nitrogen for example using limestone. Each of the adsorbents described above is packed in layers.

The fourth treatment tank 4 is a tank for decomposing BOD components by aerobic biological treatment.
A filling section 19 and a water passage section 20 are provided, and the filling section 19 includes
Weir walls 19a, 19b, 19c and 19d are provided and filled with chitosan charcoal which has been subjected to chitosan treatment as a filler.

The fifth treatment tank 5 is also an aerobic biological treatment tank, and is provided with a filling section 21 and a water passage section 22, and the filling section 21 is filled with chitosan charcoal.

The sixth treatment tank 6 corresponds to the third treatment tank 3,
Similarly, the weir walls 23a, 23b, 23c are provided and the filling section 23 filled with the assimilate and the adsorbent and the water passage section 24 are provided, and the seventh treatment tank 7 corresponds to the fourth treatment tank 4. However, similarly to this, the weir walls 25a, 25b, 25c, 25d are provided, and the filling portion 25 and the water passage portion 26 filled with chitosan charcoal are provided.

The eighth treatment tank 8 is a dephosphorization tank mainly for removing phosphorus, and is provided with a filling section 27 and a water passage section 28, and the filling section 27 is filled with a filter medium for dephosphorization. .

The ninth treatment tank 9 is a tank for performing final treatment such as decolorization, deodorization or filtration of fine suspended substances, and the weir wall 2
A filling part 29 having 9a and 29b and a water passage part 30 are provided,
The filling portion 29 is filled with ordinary charcoal, ceramic filter material, or the like.

In such a water treatment apparatus, the water to be treated is always passed through the respective water passages to the respective treatment tanks having the filler, as schematically shown by the continuous arrows in the figure. It flows in a downward flow flowing from the upper side to the lower side, and flows into the filling section of each processing tank as an upward flow from the bottom surface to the upper side, and further forms a meandering flow in the filling section of each processing tank. To do. As a result, it is possible to effectively prevent the filling material from being clogged, and it is possible to improve the contact efficiency of the water to be treated with the filling material.

[0020]

As described above, according to the present invention, it is possible to effectively prevent clogging of the filling material and increase the contact efficiency of the water to be treated with the filling material, thus stabilizing the efficient treatment. It becomes possible to do it.

[Brief description of the drawings]

FIG. 1 is a simplified cross-sectional view of a water treatment device according to an embodiment.

FIG. 2 is a plan view of the water treatment apparatus of FIG.

[Explanation of symbols]

 1-9 Treatment tanks 13, 16, 19, 21, 23, 25, 27, 29 Filling section 14, 17, 20, 22, 24, 26, 28, 30 Water passage section 16a-16c Weir wall 19a-19d Weir wall 23a ~ 23c Weir wall 25a ~ 25d Weir wall 29a, 29b Weir wall

Claims (2)

[Claims] 1. A plurality of treatment tanks, each filled with a different filling material, are provided so as to communicate in order from the upstream side to the downstream side, and water to be treated is passed through these treatment tanks and brought into contact with the filling material therein. In a water treatment device configured to perform a purification treatment, each treatment tank is provided with a filling section that is partitioned so that the upstream side and the lower side of the bottom surface are dedicated water passage sections. And the water to be treated is made to flow into each of the treatment tanks in a downward flow flowing from the upper side to the lower side of each of the treatment tanks, and rises from the bottom of the water permeability to the upper side of each of the filling sections. A water treatment device characterized in that it is made to flow in. 2. The water treatment apparatus according to claim 1, wherein the filling section is provided with one or a plurality of weir walls for imparting a vertically meandering flow to the water to be treated in the filling section.