JP3712455B2 - Water treatment equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water treatment apparatus that enables a relatively advanced purification treatment.
[0002]
[Prior art]
The present applicant previously proposed a water treatment apparatus as Japanese Patent Application No. 5-168349 (Japanese Patent Laid-Open No. 7-983). From the upstream side to the downstream side, this water treatment device is, for example, a pretreatment tank filled with a plastic porous filter medium, a denitrification tank filled with an assimilate and an adsorbent, a chitosan charcoal tank filled with chitosan charcoal, a phosphorus tank A dephosphorization tank filled with an adsorbent for adsorption and a finishing tank filled with charcoal are continuously provided, and the filler in each treatment tank is passed through each of these tanks by repeating a downward flow and an upward flow. It is highly suitable for advanced purification treatment of polluted water in a pollutant load state, for example, in a small river where household wastewater is drained as it is.
[0003]
Such a water treatment apparatus has already been installed as a practical apparatus in some rivers and the like and exhibits its excellent purification ability. However, it has been found that there is an unexpected phenomenon while collecting operation data etc. about these devices. That is, after a certain period of time from the start of operation, the actual processing efficiency is lower than that calculated.
[0004]
Therefore, in pursuit of this, some tanks may cause unexpected clogging of the filler, and even if clogging does not occur, the contact efficiency of the water to be treated with the filler may be lower than calculated. And these were found to be the cause of the efficiency loss. Therefore, when analyzing the mechanism of the clogging phenomenon and the phenomenon that the contact efficiency with the filler is reduced, it is found that clogging is likely to occur when the water to be treated flows into the filler layer in a downward flow. It was revealed that there was a bias in the water flow state in the filler layer, resulting in a blind spot portion of the flow where the flow stopped, and this was a factor in reducing the contact efficiency.
[0005]
[Problems to be solved by the invention]
The present invention has been made on the basis of such knowledge, and basically eliminates the state in which the water to be treated flows in a downward flow into the filler filled in each tank. An object of the present invention is to provide a water treatment device that can effectively prevent clogging of water. Moreover, this invention aims at provision of the water treatment apparatus which can improve the contact efficiency of the process target water to a filler by eliminating the bias of the water flow in a filler layer.
[0006]
[Means for Solving the Problems]
The water treatment apparatus according to the present invention is provided with a plurality of treatment tanks filled with different fillers in order from the upstream side to the downstream side, and the treatment target water is passed through these treatment tanks while filling the filler there. In addition to this, it is basically a contact treatment to be performed, and in addition to this, each treatment tank is divided so that the upstream side and the bottom side of the bottom surface are dedicated to water flow, and the filling material is filled. part one or more weirs wall provided partition in Rutotomoni the filling of the flow direction of the lower water passage portion processed water bottom provided and the processed water to these processing tanks, respectively It is allowed to flow into the water flow portion by a downward flow flowing from the upper side to the lower side, and to flow into the respective filling portions by an upward flow from the bottom surface of the water flow toward the upper side. making it made to flow meandering manner between water portion .
[0007]
In this water treatment device, the inflow of the water to be treated into each treatment tank is dedicated to water flow, that is, it is performed by the downward flow in the water flow portion that is not filled with a filler and has no substantial water flow resistance. Therefore, the filler layer is always allowed to flow in an upward flow with less clogging. Therefore, clogging of the filler can be effectively prevented.
[0008]
In the present invention, in such a water treatment apparatus, one or a plurality of weir walls are provided in the filling section to give a meandering flow up and down to the flow of water to be treated in the filling section.
[0009]
By doing in this way, the uneven flow of water in the filler layer can be eliminated and the blind spot portion of the flow can be substantially eliminated, and the contact efficiency of the water to be treated with the filler can be increased.
[0010]
Embodiment
As shown in FIG.1 and FIG.2, the water treatment apparatus by one Embodiment of this invention is the 1st treatment tank 1, the 2nd treatment tank 2, the 3rd treatment tank 3, and the 1st from the upstream to the downstream. 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 treatment tanks is formed by partitioning a long and narrow box formed in the ground with a concrete wall with a partition wall 10.
[0011]
The first treatment tank 1 is a primary sedimentation tank that mainly removes large suspended solids and the like, and only the flow straightening tubes 11 and 12 for adjusting the retention of water to be treated are used without using a filler or the like. To do.
[0012]
The second treatment tank 2 is a secondary sedimentation tank that mainly performs removal treatment of suspended matters and the like that cannot be removed by the first treatment tank 1, and is formed by being surrounded by a water-permeable bottom surface B and a non-water-permeable partition wall W. 13, and a water-flowing portion 14 dedicated to water flow is provided along the upstream side surface and the bottom surface B (not shown in FIG. 2) of the filling portion 13. The filling portion 13 is provided with a weir wall 15 for giving a tortuous flow to the water to be treated as schematically shown by a continuous arrow in the drawing at a middle position, for example, a contact filter medium using a plastic material ( (Not shown). The second treatment tank 2 is provided with an aeration pump P for performing aeration necessary after the third treatment tank, and an air supply pipe (not shown) is extended from the aeration pump P.
[0013]
The third treatment tank 3 is a denitrification tank that mainly performs denitrification treatment, and is provided with a filling unit 16 and a water flow unit 17 in the same manner as the second treatment tank 2. The filling section 16 is provided with weir walls 16a, 16b and 16c for meandering flow, and for utilization of microorganisms, for example, utilization of waste materials such as shiitake mushrooms, and for nitrogen using, for example, limestone Each adsorbent is packed in layers.
[0014]
The fourth treatment tank 4 is a tank for the decomposition treatment of the BOD component by aerobic biological treatment, and similarly, a filling part 19 and a water flow part 20 are provided, and the filling part 19 has a dam wall 19a, 19b, 19c, 19d are provided, and chitosan charcoal subjected to chitosan treatment is filled as a filler.
[0015]
The fifth treatment tank 5 is also an aerobic biological treatment tank, and is provided with a filling part 21 and a water passage part 22, and the filling part 21 is filled with chitosan charcoal.
[0016]
The sixth treatment tank 6 corresponds to the third treatment tank 3 and similarly has a filling part 23 provided with dam walls 23a, 23b, 23c and filled with an hydrate and an adsorbent and a water flow part 24. In addition, the seventh treatment tank 7 corresponds to the fourth treatment tank 4, and similarly has a filling part 25 provided with dam walls 25a, 25b, 25c, 25d and filled with chitosan charcoal and a water passage part 26. .
[0017]
The eighth treatment tank 8 is a dephosphorization tank that mainly performs phosphorus removal treatment, and is provided with a filling portion 27 and a water passage portion 28, and the filling portion 27 is filled with a filter material for dephosphorization.
[0018]
The ninth treatment tank 9 is a tank that performs final treatment such as decolorization, deodorization, or filtration of fine suspended solids. The ninth treatment tank 9 is provided with a filling portion 29 having a weir wall 29a, 29b and a water flow portion 30, and the filling portion 29 is provided with the filling portion 29. Fill with normal charcoal or ceramic filter media.
[0019]
In such a water treatment apparatus, as shown schematically in the figure by a continuous arrow, the water to be treated is always lowered from the upper side through the respective water passages with respect to each treatment tank having a filler. It flows in as a downward flow that flows to the side, and flows into the filling portion of each processing tank as an upward flow from its bottom surface, and forms a meandering flow in the filling portion of each processing tank. As a result, clogging of the filler can be effectively prevented, and the contact efficiency of the water to be treated with the filler can be increased.
[0020]
【The invention's effect】
As described above, according to the present invention, clogging of the filler can be effectively prevented, the contact efficiency of the water to be treated with the filler can be increased, and efficient treatment can be performed stably. It becomes possible.
[Brief description of the drawings]
FIG. 1 is a simplified cross-sectional view of a water treatment device according to one embodiment.
FIG. 2 is a plan view of the water treatment apparatus of FIG.
[Explanation of symbols]
1-9 Treatment tank
13, 16, 19, 21, 23, 25, 27, 29 Filling section
14, 17, 20, 22, 24, 26, 28, 30
16a to 16c dam wall
19a to 19d Weir wall
23a-23c Weir wall
25a to 25d dam wall
29a, 29b Weir walls

Claims (2)

A plurality of treatment tanks filled with different fillers are connected in order from the upstream side to the downstream side, and the water to be treated is passed through these treatment tanks and contacted with the fillers for purification treatment. In the water treatment equipment
Each treatment tank, a filling unit for the lower of the upstream and bottom fills the compartment to the filler so that the water passing portion of the water passing only provided Rutotomoni, lower water passage of the bottom surface of the filling portion One or a plurality of weir walls that divide the part in the flow direction of the water to be treated ,
Then, the water to be treated is introduced into each of the treatment tanks in a downward flow that flows from the upper side to the lower side, and flows into the respective filling parts in an upward flow that flows upward from the bottom of the water permeability. In addition , the water treatment apparatus is characterized in that it flows in a meandering manner between the filling portion and the water passage portion below the bottom surface thereof . The water treatment apparatus according to claim 1, wherein the filling unit is provided with one or a plurality of dam walls for providing a vertical meandering flow to the flow of water to be treated in the filling unit.

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