JPH11179112A - Wastewater treatment apparatus and unit filter for wastewater treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfy the effluence water standard by employing an economical installation while saving the maintenance and running cost. SOLUTION: A plurality of unit filters A and B each comprising a bottomed outer cylinder 1 and a bottomed inner cylinder 7 made of a pleated filter and installed in the outer cylinder as to form an outer flow route between the outer cylinder 1 and the inner cylinder 7 and an inner flow route 14 in the inner cylinder 7 are joined. The terminal part of the inner flow route 14 of the unit filter in the upstream side is connected with the tip part of the outer flow route 13 of the next unit filter in the downstream side and the terminal part of the outer flow route 13 of the unit filter in the upstream side is connected with the tip part of the inner flow route 14 of the next unit filter in the downstream side and neighboring unit filters are successively connected in such a manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for treating wastewater containing organic matter and a unit filter suitable for the apparatus.

[0002]

2. Description of the Related Art In restaurants and other restaurants, a large amount of kitchen wastewater containing organic matter is generated based on cooking, discarding leftover food, washing dishes, and the like. In addition, drainage with a high starch content is generated by boiling noodles in a boiled noodle factory and the like, and furthermore, by polishing rice in a rice washing factory and the like. Conventionally, as a device for treating wastewater containing organic matter such as kitchen wastewater, there are a septic tank and a miscellaneous waste tank with a grease strap. The septic tank performs violent biological treatment in which microorganisms are propagated in the tank and the wastewater is exposed to air while stirring. In addition, the miscellaneous drainage tank with a grease strap was separated before and after the raw water flowing from the raw water inlet of the treatment tank was first poured into a sieve to remove debris, and the raw water passed through the sieve was raised from underwater to above the water surface. While flowing between the partition walls, the oil (grease) and scum with a low specific gravity float and catch, and the substance with a high specific gravity precipitates in the tank,
Furthermore, residual organic matter is decomposed and digested by microorganisms that have propagated in the water tank, and the resulting purified water is discharged from a purified water outlet to a drain, a sewer, or the like.

[0003]

In the septic tank for performing the above-mentioned anaerobic biological treatment, the region where microorganisms are present is a liquid to be treated or a floating scum in a limited tank, and the microorganisms are an organic substance in the liquid to be treated. Stirring and violence of the liquid to be treated are indispensable for maintaining good contact with the liquid. For this reason, a stirrer is required, which increases equipment and operation costs, and in addition, noise, vibration, and offensive odor are generated with the stirring operation, which may adversely affect the surroundings. In addition, since the contact time between the organic matter and the microorganism is instantaneous, the resolution of the organic matter is low, and therefore, the processing capacity per hour is low, and it meets the processing demands of large-scale kitchens and the like in which wastewater containing a large amount of organic matter is generated. Can not do. Furthermore, when the amount of floating scum increases, the processing capacity of microorganisms also decreases due to a decrease in the violent effect. Therefore, periodic water quality inspection of the septic tank, scum removal, and other management are required, and maintenance costs are incurred. On the other hand, miscellaneous drainage tank with grease strap,
It is necessary to manage the water regularly, and if the captured oil and scum are not removed regularly, the purification capacity will be reduced and the survival conditions of the microorganisms will not be satisfied. The purified water discharged from the outlet is
There are many cases where the legally regulated effluent quality standards have not been met. Therefore, the kitchen wastewater discharged into drains and sewers shows high measurement values exceeding the discharge water quality standards for each inspection item such as BOD, COD, SS, nitrogen, phosphorus, and hexane extractable substances, It is a problem of environmental pollution, and effective measures are desired.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to perform a reliable and effective organic matter decomposition treatment capable of achieving a discharge water quality standard value with a minimum facility and maintenance cost. Another object of the present invention is to provide a wastewater treatment apparatus having a high treatment capacity. Another object is to reduce the size of a wastewater treatment apparatus having a high treatment capacity so that the installation place is not troublesome. Still another object is to provide a unit filter suitable for use in the wastewater treatment device. Still another object is to make it easy to reproduce and use when the processing capacity is reduced.

[0006]

In order to solve the above-mentioned problems, a wastewater treatment apparatus according to the present invention has an outer cylinder having bottom walls at both ends, and has a bottom wall at both ends and is formed by a pleated filter. A plurality of unit filters each having an inner flow path formed between the inner wall surface of the outer cylinder and the outer wall surface of the inner cylinder, and an inner flow path formed in the inner cylinder. Concatenate,
The end of the inner flow path of the upstream unit filter is located at the tip of the outer flow path of the downstream unit filter, and the end of the outer flow path of the upstream unit filter is located at the tip of the inner flow path of the downstream unit filter. , Respectively. With the above configuration, when raw water of wastewater flows into the tip of the inner flow path of the unit filter on the most upstream side, a part of the raw water passes through the inner cylinder from the inner flow path and moves to the outer flow path, and the physical treatment is performed. (Clear filtration). Organic matter contained in raw water moving in the inner flow path and the outer flow path in the downstream direction is decomposed and digested (biological treatment) by bacteria that are attached to and propagate on the filter surface of the inner cylinder. The water to be treated that has reached the end of the inner flow path of the upstream unit filter flows into the distal end of the outer flow path of the downstream unit filter. Further, the purified water that has passed through the outer flow path of the upstream unit filter flows into the distal end of the inner flow path of the downstream unit filter from the end of the outer flow path. In any of the unit filters, the water is subjected to physical treatment when passing through the inner flow path to the outer flow path, and the water to be treated flowing through the inner flow path and the outer flow path adheres and propagates on the filter surface of the inner cylinder. Biologically treated by bacteria.

[0007] The connecting pipe connecting the end of the inner flow path of the upstream unit filter to the tip of the outer flow path of the downstream unit filter may be provided with an adjusting valve for adjusting the hydraulic power of the inner flow path. desirable. By providing the adjusting valve, it is possible to individually adjust the water pressure of the inner flow path in each unit filter so as to be higher than the water pressure of the outer flow path.

The wastewater treatment apparatus according to the present invention preferably has a structure in which a plurality of unit filters are connected in a meandering manner and attached to a frame in one or more layers. According to the above configuration, since a large number of unit filters can be accommodated in a compact block shape, the apparatus can be downsized even if it has a large processing capacity.

The unit filter comprises: (1) an outer cylinder having a bottom wall at both ends and an inner cylinder having a bottom wall at both ends and formed of a pleated filter; An outer flow path is formed between the outer cylinder and the outer wall of the inner cylinder, and an inner flow path is formed in the inner cylinder, and penetrates a bottom wall of one end of the outer cylinder and a bottom wall of the inner cylinder opposed thereto. An inflow pipe that communicates the outside of the outer cylinder with the inner flow path, penetrates the bottom wall of the other end of the outer cylinder and the bottom wall of the inner cylinder facing the same, and connects the outer and inner flow paths of the outer cylinder. A configuration in which an outflow pipe for communication is provided, and a communication port for communicating an external flow path to the outside is provided in a bottom wall of the other end of the outer cylinder; or (2)
In an outer cylinder having bottom walls at both ends, an inner cylinder having a bottom wall at both ends and having a pleated filter is provided, and an outer flow is formed between an inner wall surface of the outer cylinder and an outer wall surface of the inner cylinder. Each of the passages forms an inner flow path in the inner cylinder, and penetrates a bottom wall of one end of the outer cylinder and a bottom wall of the inner cylinder opposed thereto to communicate the outside of the outer cylinder with the inner flow path. The inflow pipe is provided with an outflow pipe which penetrates the bottom wall of the other end of the outer cylinder and the bottom wall of the inner cylinder opposed thereto to communicate the outside of the outer cylinder with the inner flow path. Configuration provided with a communication port for communicating the external flow path to the outside on the bottom wall of the portion,
It can be. The unit filter having the above configuration (1) is suitable as a unit filter on the most upstream side, can connect the inflow pipe to the wastewater generation source, and connects the outflow pipe to the upstream side of the unit filter on the downstream side. The downstream communication port can be connected to the inflow pipe of the downstream unit filter. The unit filter having the configuration (2) is suitable as a unit filter of the second stage or lower, and the inflow pipe is provided with the downstream communication port of the upstream unit filter and the upstream communication port thereof. The outlet pipes of the upstream unit filters can be connected to each other by connecting pipes, the outlet pipes have the upstream communication ports of the downstream unit filters, and the downstream communication ports have the downstream communication ports. Can be respectively connected.

In the unit filter, the bottom wall of the outer cylinder is formed of an annular bottom plate separate from the outer cylinder, and is removably connected to an outward flange formed at an end of the outer cylinder, and the inner cylinder flows into the unit cylinder. Preferably, it is fixed to the bottom wall via a pipe and an outflow pipe. With the above configuration, when the pleated filter of the inner cylinder has reduced permeability due to accumulation of foreign matter, replace the unit filter with a new one, remove the bottom wall of the unit filter from the outer cylinder, and replace the inner cylinder. It can be easily removed and washed, and the processing capacity can be regenerated and reused.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a basic configuration of a wastewater treatment apparatus according to the present invention, and FIG.
3 is a perspective view showing an example of the preferred embodiment, and FIG. 4 is a front view of the same. FIG. 5 is a conceptual diagram illustrating a preferred use mode of the wastewater treatment apparatus according to the present invention.

In FIG. 1, A and B are unit filters. The unit filter A has an outer cylinder 1 formed of a metal material or a synthetic resin material having chemical resistance, corrosion resistance, and non-rust. The outer cylinder 1 has outward flanges 2 and 3 at its both ends.
have. The annular bottom walls 4 and 5 are closely attached to the outer surfaces of the flanges 2 and 3 and are detachably fixed by bolts and nuts 6 or the like. One end (upstream) bottom wall 4
Has a hole formed only at the center thereof, but holes are formed in the bottom wall 5 on the other end side (downstream side) at the center and at a position slightly deviated from the center.

Inside the outer cylinder 1, there is provided an inner cylinder 7 formed of a pleated filter. A pleated filter is a sheet made by pulping pulp or fiber at a high density and joining the rectangular filters formed by alternately folding the valleys at equal intervals into a tubular shape. Has bottom walls 8, 9 joined together. The inner wall and the outer side of the inner cylinder are communicated with both bottom walls, and a pipe 1 extending outward from the bottom wall is provided.
0 and 11 are connected. One of the tubes becomes an inflow tube and the other tube becomes an outflow tube. In the example shown, tube 1
0 is inserted into a hole of the bottom wall 4 of the outer cylinder 1, a fixing plate 12 is fitted to a portion extending to the opposite side, and the fitting plate is fixed to the bottom wall 4 by screws or the like, whereby the pipe 10 is formed. Bottom wall 4 as inflow pipe
It is fixed to. However, the method of fixing the tube 10 to the bottom wall 4 is not limited. Further, the other pipe 11 of the inner cylinder 7 is inserted into a hole at the center of the bottom wall 5 of the outer cylinder, and is fixed to the bottom wall 5 as an outflow pipe in the same manner as in the case of the pipe 10.
Thus, the inner cylinder 7 is attached to the two bottom walls 4 and 5 in a state separated from the inner wall surface of the outer cylinder 1 in the center direction, and the outer flow path 13 is formed between the outer cylinder 1 and the inner cylinder 7. Inner channel 1 in cylinder 7
4 are formed. The hole provided at a position deviated from the center of the downstream side bottom wall 5 is a communication port 16 for communicating the external flow path 13 to the outside, and is provided with a cylindrical portion 16a extending outward from an edge of the communication port. Have been.

The unit filter B has substantially the same configuration as the unit filter A. Therefore, the same reference numerals are used for corresponding members. The point different from the unit filter A is that, in the unit filter B, holes are formed at both the center and the position off the center on both the upstream and downstream bottom walls 4 and 5. is there. An inflow pipe 10 connected to the inner cylinder 7 is inserted through a hole at the center of one bottom wall 4, and the pipe is fixed to the bottom wall 4. The outflow pipe 11 connected to the inner cylinder 7 is inserted through the hole, and is fixed to the bottom wall 5 thereof. The method of fixing the pipe to each bottom wall is the same as that of the first unit filter A. The hole formed at a position deviated from the center of both bottom walls 4 and 5 is a communication port 1 that allows the external flow path 13 to communicate with the outside.
5, 16 are provided with cylindrical portions 15a, 16a extending outward from the edges of the respective communication ports.

In the wastewater treatment apparatus according to the present invention, the unit filter A and the plurality of unit filters B are connected as follows. That is, the end of the inner flow path of the upstream unit filter is located at the tip of the outer flow path of the downstream unit filter, and the end of the outer flow path of the upstream unit filter is located at the inner flow path of the downstream unit filter. Are connected so as to be sequentially coupled to the respective tips.

More specifically, first, the unit filter A on the most upstream side and the unit filter B on the next stage are:
The outflow pipe 11 of the unit filter A and the upstream communication port 15 of the next unit filter B are connected by the first connection pipe 17, and the downstream communication port 16 of the unit filter A is connected to the next unit. The inflow pipe 10 of the filter B is connected with the second connection pipe 18. As a result, the inner flow path 14 of the unit filter A on the most upstream side becomes the outer flow path 13 of the next unit filter B, and the outer flow path 13 of the unit filter A becomes the inner flow path of the next unit filter B. 14 respectively.

The upstream unit filter B and the downstream unit filter B are connected to the outflow pipe 11 of the upstream unit filter B and the upstream communication port 15 of the downstream unit filter B. The downstream communication port 16 of the unit filter B on the upstream side and the inflow pipe 8 of the unit filter B on the downstream side are connected by the second connection pipe 18. As a result, the inner flow path 14 of the upstream unit filter B is located in the outer flow path 13 of the downstream unit filter B, and the outer flow path 13 of the upstream unit filter B is located in the downstream unit filter B. Each is communicated with the flow path 14.

Although not shown in any of the first connecting pipes 17, the pressure is adjusted so that the water pressure in the inner flow path of the unit filter on the upstream side is higher than the water pressure in the outer flow path. Is provided. Thereby, in all the unit filters, the water to be treated can surely permeate the filter (7) from the inner flow path to the outer flow path. Since the water pressure is adjusted for each unit filter, it is possible to adjust the filter passage rate of the water to be treated in the filter to prevent a large variation in the clogging progress speed of the filter. The purification rate in the final purified water discharged from the end of the wastewater treatment device is
Performance adjustments of the entire device can be made to achieve or maintain a desired level. If the clogging progress speed of each unit filter can be made uniform, the performance life of the device can be extended, so that the management cycle can be set longer and the maintenance cost can be reduced.

FIG. 1 shows only three unit filters for the sake of convenience to clearly show the structure and connection relationship of each unit filter A, B, but discharges per hour such as kitchen drainage. In order to provide a processing capacity corresponding to the above, the number of connected unit filters B needs to be increased. In such a case, in order to make the volume of the wastewater treatment device as small as possible,
As illustrated in FIG. 3, the filter unit A is connected in a meandering manner from the uppermost unit filter A to the terminal unit filter B8 via the unit filter B1 of the next stage or lower, and is connected to the frame F or the like in one or more layers. It is preferable to fix the arrangement. FIG. 3 is merely an example, and the number of the unit filters B is arbitrary. When such an arrangement structure is adopted, for example, the size of a wastewater treatment apparatus having a treatment capacity of 30 tons / day is H1.
A relatively small device of 500 mm, W1800 mm, and D4500 mm can be obtained.

In the wastewater treatment apparatus according to the present invention, it is important that bacteria adhere to and propagate on the inner cylinder 7 in all unit filters. Therefore, it is necessary for the wastewater treatment apparatus to always maintain running water so as not to kill bacteria. From this point of view, as shown in FIG. 5, the wastewater treatment apparatus of the present invention temporarily stores wastewater dw from a wastewater generation source in a water receiving tank 19,
It is desirable that the system be installed and used so as to supply raw water with the use of a water source. That is, the water receiving tank 19 that receives the raw water dw generated from the kitchen or the like returns the primary tank 20 and the secondary tank 21 to the return hole 2.
2 is separated by a partition wall 23 in which the primary tank 20 is opened.
Raw water is constantly supplied to the inflow pipe 10 of the uppermost unit filter A of the wastewater treatment apparatus WP of the present invention by the submersible pump 24 placed at the bottom of the wastewater treatment apparatus WP, and purified water is supplied from the unit filter B at the end of the wastewater treatment apparatus WP. Is discharged to the secondary tank 21,
Even when no wastewater is generated from the wastewater source, the water flow of each unit filter of the wastewater treatment apparatus WP is maintained, so that bacteria are prevented from being killed. In addition, the amount of wastewater generated is large,
When the purified water is full in the secondary tank 21, it can overflow from the overflow 25 and be discharged to a drainage channel or a sewer.

In the use mode illustrated in FIG. 5, the results of the inspection of the water quality after the wastewater treatment using the wastewater treatment apparatus of the present invention having the above-mentioned size are shown in [Table 1].

[Table 1] In [Table 1], the left column is an inspection item, S1 is raw water, S2.
Is purified water after treatment by this apparatus. As is clear from this, the above inspection results satisfy all legally required effluent water quality standards. Since the water quality after the treatment is good, when the wastewater treatment device of the present invention is applied to the wastewater treatment of a boiled noodle washing device or the wastewater treatment of a rice washing device,
The purified water after the treatment can be recycled and reused, or can be used for other purposes as intermediate water, and a great economic effect can be obtained.

The wastewater treatment apparatus according to the above embodiment is suitable for bacterial adhesion and propagation because the inner cylinder is formed of a pleated filter. In addition, the liquid to be treated has a large contact area with bacteria when the liquid to be treated passes through the inner flow path and the outer flow path and when it passes through the inner cylinder, so that the organic substance decomposition performance is excellent. Then, the liquid to be treated, in the multiple-stage unit filter, alternately flows through the inner flow path and the outer flow path, it is considered that this occurs when the liquid to be processed flows only from the inner flow path to the outer flow path direction. It is possible to prevent strong clogging of the inner cylinder from the most upstream to the downstream in a relatively short time. If the inner cylinder is strongly clogged, the water flow in the outer flow path stops, killing bacteria and extremely reducing the ability to decompose organic substances.This triggers early detection of the downstream inner cylinder filter. Clogging occurs. In the present invention, since the inner flow path and the outer flow path are alternately circulated, the water flow is always maintained in any flow path, so that clogging does not occur for a long time, the life of the filter is extended, The management cycle can be extended, and maintenance costs can be reduced.

[0023]

As described above, according to the present invention, the inner cylinder is formed of a pleated filter, and the outer flow path is formed between the inner wall surface of the outer cylinder and the outer wall surface of the inner cylinder. A plurality of unit filters having flow paths are connected, and the end of the inner flow path of the upstream unit filter is connected to the tip of the outer flow path of the downstream unit filter, and the end of the outer flow path of the upstream unit filter. Are sequentially connected to the end of the inner channel of the unit filter on the downstream side, respectively, so that equipment costs and maintenance costs are significantly reduced compared to conventional septic tanks, etc., and effective discharge water quality standards can be surely cleared. It is possible to provide a wastewater treatment apparatus in which organic matter decomposition treatment is performed and which has a high treatment capacity per time.

According to a second aspect of the present invention, in the wastewater treatment apparatus, the water pressure in the inner flow passage is connected to a connecting pipe connecting the end of the inner flow passage of the upstream unit filter to the tip of the outer flow passage of the downstream unit filter. Adjustment valves are provided to adjust the water pressure of the inner flow path in each unit filter so that it is higher than the water pressure of the outer flow path. The to-be-processed water permeates the road, stable filtration accuracy can be obtained, uniform inspection of the clogging state can be performed, and highly reliable management can be expected.

In the wastewater treatment apparatus according to the third aspect, since a plurality of unit filters are connected in a meandering manner and are attached to the frame in one layer or a plurality of layers, a large number of unit filters are compact blocks. Since it can be accommodated in a shape, it is possible to reduce the size of the apparatus while having a large processing capacity, and it can be installed anywhere.

The unit filter according to the fourth aspect is suitable as a unit filter on the most upstream side.

The unit filter according to claim 5 is suitable as a unit filter of the second stage or lower.

In the unit filter according to the present invention, when the permeability of the pleated filter of the inner cylinder is reduced, the bottom wall of the unit filter is removed from the outer cylinder, and the inner cylinder is easily taken out for cleaning. The processing capacity can be reclaimed and reused. Therefore, an increase in equipment costs or maintenance costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a basic configuration of a wastewater treatment apparatus according to the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a perspective view showing an example of a preferred embodiment.

FIG. 4 is a front view of the same.

FIG. 5 is a conceptual diagram illustrating a preferred use mode of the wastewater treatment apparatus according to the present invention.

[Explanation of symbols]

 Reference Signs List A Unit filter on the most upstream side B Unit filter below the next stage 1 Outer tube 2, 3 Flange 4, 5 Bottom wall 7 Inner tube (pleated filter) 8, 9 Bottom wall 10 Inflow pipe 11 Outflow pipe 13 Outer flow path 14 Internal flow path 15 Upstream communication port 16 Downstream communication port 17 First connecting pipe 18 Second connecting pipe

Claims (6)

[Claims] 1. An outer cylinder having a bottom wall at both ends and an inner cylinder having a bottom wall at both ends and formed of a pleated filter, wherein an inner wall surface of the outer cylinder and the inner cylinder are provided. An outer flow path between the outer wall surface and a plurality of unit filters each having an inner flow path formed in the inner cylinder are connected, and the end of the inner flow path of the upstream unit filter is connected to the downstream side. A wastewater treatment apparatus, wherein a distal end of an outer flow path of a unit filter and a terminal of an outer flow path of an upstream unit filter are sequentially connected to a distal end of an inner flow path of a downstream unit filter, respectively. 2. An adjusting valve for adjusting a water pressure of the inner flow path is provided in a connecting pipe connecting an end of an inner flow path of the upstream unit filter to a tip of an outer flow path of the downstream unit filter. The wastewater treatment device according to claim 1, wherein: 3. The wastewater treatment apparatus according to claim 1, wherein the plurality of unit filters are connected in a meandering manner, and are attached to the frame in one or more layers. 4. An outer cylinder having a bottom wall at both ends and an inner cylinder having a bottom wall at both ends and formed of a pleated filter, wherein the inner wall of the outer cylinder and the inner cylinder are provided. An outer flow path is formed between the outer wall surface and the inner flow path in the inner cylinder, and a bottom wall of one end of the outer cylinder and a bottom wall of the inner cylinder opposed thereto are penetrated. An inflow pipe that communicates the outside of the outer cylinder with the inner channel, penetrates a bottom wall of the other end of the outer cylinder and a bottom wall of the inner cylinder opposed thereto, and connects the outside of the outer cylinder to the outside of the outer cylinder. A unit filter provided with an outflow pipe for communicating the inner flow path and a communication port for communicating the outer flow path to the outside at the bottom wall at the other end of the outer cylinder. 5. An outer cylinder having a bottom wall at both ends and an inner cylinder having a bottom wall at both ends and formed of a pleated filter, wherein an inner wall surface of the outer cylinder and the inner cylinder are provided. An outer flow path is formed between the outer wall surface and the inner flow path in the inner cylinder, and a bottom wall of one end of the outer cylinder and a bottom wall of the inner cylinder opposed thereto are penetrated. An inflow pipe that communicates the outside of the outer cylinder with the inner channel, penetrates a bottom wall of the other end of the outer cylinder and a bottom wall of the inner cylinder opposed thereto, and connects the outside of the outer cylinder to the outside of the outer cylinder. A unit filter provided with an outflow pipe for communicating the inner flow path, and a communication port for communicating the outer flow path to the outside at a bottom wall at both ends of the outer cylinder. 6. A bottom wall of the outer cylinder is formed of an annular bottom plate separate from the outer cylinder, and is detachably connected to an end of the outer cylinder. The inner cylinder has an inflow pipe and an outflow pipe. The unit filter according to claim 4, wherein the unit filter is fixed to the bottom wall via a base.