JPS59186698A - Contact filter medium for treatment of sewage - Google Patents

Abstract

PURPOSE:To obtain a contact filter medium which is simple in construction and hag high efficiency in cleaning up sewage by using a material having high strength and forming integrally single or plural sheets of spiral vanes on the peripheral surface of a central shaft in the longitudinal direction thereof. CONSTITUTION:The sewage turned forcibly by rotary vanes 20, 21, 22 contacts with the biological membranes formed on both front and rear surfaces of spiral vanes 2 while the sewage is guided by the curved surfaces of said vanes when the sewage passes contact filter medium layers R1, L2 and since the sewage flows while swirling around the central shaft 1, the stirring and mixing thereof are accelerated and the sewage is effectively cleaned up. The adjacent sewage turned counterclockwise by the vanes 2 collide against each other at the top, bottom, right and left contact points, where turbulence arises and the sewage is stirred and mixed extremely effectively. The laminated contact filter media make point contact with the vertically and laterally adjacent filter media at the vanes 2, by which the swirling and turbulence of the sewage are effectively accomplished.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a contact filter medium for sewage treatment, which is suitable for use in purifying sewage while circulating it in a circulating waterway type septic tank.

The circulating waterway type sewage purification equipment conventionally used as a J-Ri sewage purification equipment uses a surface aeration method that supplies oxygen through contact with the water surface, so the water depth is limited to 2 meters and cannot be deeper than that. Common defects of the activated sludge method: -C scratches, therefore requiring a large facility area, and being an activated sludge method, it is unsuitable for purifying domestic wastewater with relatively low pollution concentration. Due to the fact that it has the following characteristics, there is a tendency for this device to be abandoned at present.

However, since the above-mentioned circulating waterway type sewage purification device is a device with a simple structure, if a contact aeration method is combined with it to form a circulating waterway type contact aeration type purification device, purification efficiency can be improved. On the other hand, since the water depth can be made as deep as 500 meters, the entire device can be made more compact and the problem of facility space can be solved.However, the biggest problem is that currently there are no There is no suitable contact filter material available.

The essential requirements for a contact filter medium suitable for this circulating waterway type contact aeration purification device are that it has the strength to withstand semi-permanent use.

(2+　Surface to which biofilm adheres (hekagii).

■ Low resistance to water flow.

Li) The porosity is too large.

■) It must have a structure that easily causes turbulence in the water flow.

It must simultaneously satisfy the following conditions.

Therefore, the present invention satisfies the above-mentioned conditions and is therefore an extremely innovative contact 'I! that makes it possible for the first time to put a circulating waterway type contact aeration type sewage treatment device into practical use!
! , the main object of the invention is to provide a material, and in order to achieve the above-mentioned object, the present invention uses a material with excellent strength to provide a single or It is composed of multiple spiral blades that are integrally formed.

Next, preferred embodiments of the present invention described above will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side view showing an embodiment of the contact filter medium according to the present invention, and in the figure, 1 is a central axis, and 2 is a spiral blade formed in the longitudinal direction of the circumferential surface of the central axis 1. The entire contact filter medium of the present invention having such a structure is integrally formed of a metal having a high specific gravity and excellent strength, a synthetic resin, or a suitable industrial waste. In addition, in the embodiment shown in FIG. 1, one spiral blade 2/) is formed on the circular surface of the central axis 1, but as in the embodiment shown in FIG. In some cases, a material having four helical blades 2 (shaved) formed at equal intervals may be used.Furthermore, in the contact filter medium shown in Fig. 1, the spiral blades 2 are formed in a right-handed manner. This may be left-handed, and in normal use, a combination of a number of right-handed helical contacts and a number of left-handed helical contact filter media is used.

Fig. 2 shows an embodiment in which the contact d-fixed material according to the present invention is used in a circulating waterway type sewage purification device. These contact filter media have a right-handed helical structure, and the reference numerals indicate contact filter media that have a left-handed helical structure according to the present invention.

As shown in the figure, in a circulating waterway type sewage purification device 10 [jl], which has a continuous circulating waterway formed by a partition wall, in a first aeration zone 11 equipped with a rotating blade 20; A flow velocity is applied in the horizontal direction to circulate the water to the outer circumferential circulation waterway 12 at a constant flow velocity.

Reference numeral 13 denotes a second aeration zone connected to the tip of the outer circumferential circulation waterway 12, and the second rotary blade 21 provided in the second aeration zone 13 further stirs and mixes the wastewater, which is given a flow rate. is circulated through the inner circumferential reversing waterway 14, and after being stirred and mixed by the third rotary blade 22 in the third aeration zone 15, and a flow rate is obtained, the above-mentioned The sludge is circulated to the first aeration zone 11, and by repeating the above circulation, the sludge is gradually coagulated and precipitated,
This is a system that can purify sewage. Although not shown, each aeration zone 11.13.1
In some cases, an air blowing device is installed to increase the dissolved oxygen content of wastewater.

In order to use the contact filter medium of the present invention in the circulating waterway type sewage purification device 10 configured as described above, for example, a large number of contact filter media having a right-handed helical structure are attached to the circulating waterway tank 3 as shown in the sectional view of FIG.
0 from the bottom to slightly above the water surface, and while connecting in the extension direction (circulation direction) of this contact material layer, multiple pieces of contact filter material with a left-handed helical structure may be stacked in the same way. . In the embodiment shown in FIG.
C configured right-handed and left-handed contact filter media layers R1 and 1-1
are installed at a total of three locations at the inlet, middle, and outlet of the outer circumferential circulation waterway 12, and are also installed on each of the outward and return routes of the inner circumferential reversal waterways 13 and 14, respectively.

In this way, in the circulating waterway type sewage purification device 1o in which each contact filter layer R1, L1 is provided in the middle of each waterway, each rotating blade 20.
21. The wastewater that is forcibly circulated by 22 is
@ When passing through R1 and L1, the advection occurs while rotating around the central axis 1 while being guided by the curved surface of each spiral blade 2 and coming into contact with the biofilm formed on both the front and back sides of the blade, resulting in agitation. Mixing is promoted and purification is carried out effectively.

Figure 4 shows the swirling state of sewage in a contact filter medium with a left-handed helical structure.
The sewage swirled counterclockwise by the .

In addition, in the laminated contact ifi shrine as described above, since the filter media adjacent to each other on the upper and lower, left and right sides are in point contact with each other, the voids between the filter media are reliably maintained and the sewage water is Swirl and turbulence can be effectively achieved.Furthermore, contact filter media l1WR1 and "1
When the sewage is connected and filled in the longitudinal direction, the sewage advected while swirling between Stirring and mixing are further facilitated.

Therefore, in the circulating waterway type sewage purification device 10 in which the contact filter medium according to the present invention is installed in the middle of the waterway as shown in FIG. Since the purification effect due to contact with water is also sufficiently received, it is possible to exert the purification effect of soaking.

In FIG. 3, 40 is a non-woven fabric 41 made of synthetic resin, which is connected between the permeable soil coated on the upper surface of the contact layer H (40). Each contact filter
1, 1-1... It is coated on the top surface of soil microorganisms to actively purify it and prevent the release of odors and pathogenic bacteria.

The contact filter medium according to the present invention is as described above, and if a large number of contact filter media according to the present invention are installed in a stacked state for the flow of wastewater circulating laterally in the circulation waterway, the wastewater will be removed from each contact. While being guided by the curved surface of the spiral blade of filtration +2 and forcibly swirling within the gap of the spiral blade, during this swirling, it is uniformly applied to the biofilm formed on both the front and back surfaces of each spiral blade. (while being able to undergo highly efficient purification,
The turbulent flow caused by repeated swirling allows for efficient aeration and aeration, which further enhances the purification effect. 1 rL or less 111.11 river 1,111/no.1.
Arrangement Nohari':! bI': Il'1tIItII (4. By using it, it has the advantage that it can withstand long-term use and can be purified labor-savingly, so the above-mentioned ■ ~
It is possible to provide an optimal contact material that meets all of the conditions described in (1) and (C). Therefore, it is not suitable for dogs to be used in various circulating waterway type sewage purification devices including the device shown in the figure.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an embodiment of the contact material according to the present invention, and Fig. 2 is a plan view showing an embodiment of the contact ill +A of the present invention when used in a circulating waterway type sewage purification device. The configuration diagram and FIG. 3 are front views showing the septic tank in cross section of the contact material ■ made of the contact material of the present invention, and FIG. Figure 5 is a front view of a plurality of spiral blades (not showing other embodiments of the present invention). 1... Central axis, 2... Spiral blades. Patent applicant: Bamboo Tei 2 Procedural Amendment (Voluntary) May 18, 1981 1, Description of the case 1988 Patent Application No. 61669 2, Name of the invention Contact filter material for sewage treatment 3, Person making the amendment Relationship with the case Patent Applicant: 580-1 Bold Iwatsuki, Iwatsuki City, Saitama Prefecture, Takeshita Teiji 4, Agent 7, Complete specification subject to amendment 1, Name of the invention Contact filter medium for sewage treatment 2, Claims Excellent strength A contact filter material for sewage treatment characterized by integrally forming one or more spiral blades in the longitudinal direction of the circumferential surface of a central axis using a material made of The present invention relates to a contact filter material for sewage treatment which is suitable for use when purifying wastewater while circulating it in a circulating waterway type septic tank. Because it is a surface aeration method that supplies oxygen through contact with the water surface, the water depth is limited to 2 meters and cannot be deeper than that. Therefore, it requires a large facility area, and since it is an activated sludge method, it is difficult to compare It is said that it is not suitable for purifying domestic wastewater with a low concentration of pollution.
Due to the common deficiencies of the activated sludge process, this device currently tends to be abandoned. However, since the above-mentioned circulating waterway type sewage purification equipment has a simple structure, if it is combined with the contact aeration method to create a circulating waterway type contact aeration type purification equipment, purification efficiency can be improved while the water depth can be reduced to approximately Since it can be made as deep as 5m, it is possible to make the entire device more compact and solve the problem of facility space, but the biggest problem is that there is currently no suitable contact filter material that can be used in the above device. It is a point. The essential requirements for a contact filter medium suitable for this circulating waterway type contact aeration purification device are: (1) It must have the strength to withstand semi-permanent use against the horizontal water flow of the circulating waterway. ■ Large surface area for biofilm attachment. ■ Less resistance to water flow. ■ High porosity. ■ It must have a structure that easily causes turbulence in the water flow. It must be possible to simultaneously satisfy the following conditions. Therefore, the present invention can satisfy the above-mentioned conditions, and thus provides an extremely innovative contact filter medium that makes it possible for the first time to put a circulating waterway type contact aeration type sewage treatment device into practical use. In order to achieve the above-mentioned object, the present invention uses a material with excellent strength to form one or more spiral blades in the longitudinal direction of the circumferential surface of the central shaft. It is constructed so that it is integrally formed. Next, preferred embodiments of the present invention described above will be described in detail with reference to the accompanying drawings. FIG. 1 is a side view showing an embodiment of the contact filter medium according to the present invention, and in the figure, 1 is a central axis, and 2 is a spiral blade formed in the longitudinal direction of the circumferential surface of the central axis 1. The entire contact filter medium of the present invention having such a structure is integrally formed of a metal having a high specific gravity and excellent strength, a synthetic resin, or a suitable industrial waste. Furthermore, in the example shown in FIG. 1, one spiral blade 2 is formed on the circumferential surface of the central shaft 1, but as in the example shown in FIG. In some cases, a structure in which a total of four spiral blades 2 are formed at equal intervals may be used. Furthermore, although the contact material 7 shown in FIG. 1 has a spiral blade 2 formed in a right-handed manner, it may also be left-handed, and in normal use, many of the contact filter media have a right-handed spiral shape. A combination of a book and a large number of left-handed spiral contact filter media is used. FIG. 2 shows an example in which the contact filter medium according to the present invention is used in a circulating waterway type sewage purification device.
The reference numeral R indicates a contact filter medium having a right-handed helical structure according to the present invention, and the reference numeral R indicates a contact filter medium having a left-handed helical structure according to the present invention. As shown in the figure, the circulation water purification device 10, which has a continuous circulation waterway formed by partition walls, agitates and mixes wastewater in a first aeration zone 11 equipped with rotating blades 20, and increases the flow rate in the horizontal direction. is given to circulate the water to the outer circumferential circulation waterway 12 at a constant flow rate. 13 is a second aeration zone connected to the tip of the circumferential circulation waterway 12, and the second aeration zone 13 is further agitated and mixed by the second rotating blade 21. One,
The wastewater given a flow velocity is circulated to the inner circumference reversal channel 14, and is again agitated and mixed by the third rotary vane 22 in the third aeration zone 15, and after being given a flow velocity, the wastewater is returned to the inner circumference inversion channel 15. is circulated to the first air zone 11, and by repeating the above circulation, the pollutants are gradually biodegraded, thereby converting the wastewater into F9. . Although not shown in the drawings, each aeration zone 11, 13, and 15 is provided with an air blowing device for increasing dissolved oxygen and agricultural yield of wastewater. In order to use the contact filter medium of the present invention in the circulating waterway type sewage purification device 10 configured as described above, for example, a large number of contact filter media R having a right-handed helical structure may be inserted into the circulating waterway tank 30 in a straight line as shown in the sectional view of FIG. While there was snow falling from the bottom to slightly above the water surface, this contact 6F! While connected in the direction of extension of the moon layer (in the direction of circulation), a large number of contact filters with a left-handed spiral structure may be stacked in the same manner. In the embodiment shown in FIG. 2, the right-handed and left-handed contact decoys R1 and Ll, which are successively constructed as described above, are installed in each straight portion of the circulation water channel 12, 14, and 15, respectively. In this way, each contact filter layer R1, 1-1 is provided in the middle of each waterway (in the circulating waterway type sewage purification device 10, each rotary blade 2
0.21.22 When the wastewater forcibly circulated passes through each contact filter medium BRI, Ll, each spiral blade 2...
Since the advection flows while being guided by the curved surface of . and rotating around the central axis 1 while contacting the biofilm formed on both the front and back surfaces, agitation and mixing are promoted and purification is performed effectively. Figure 4 shows the swirling state of sewage by the contact filter medium L... having a left-handed helical structure. They collide at each of the upper and lower, left and right contact points -C, where turbulent flow occurs and stirring and mixing are carried out extremely effectively. In addition, in the contact filter media stacked as described above, since the filter media adjacent to each other vertically, horizontally, and horizontally are in point contact with each other, the voids between the filter media are reliably maintained and the sewage swirls. and turbulent flow can be effectively achieved. Furthermore,
When the contact filter media 1iR1 and Ll with opposite helical directions are connected and filled in the longitudinal direction, the sewage advected while swirling between the filter media is transferred to 1MR1 or (Ll) with the helical blades 2 in different directions.
The stirring and mixing of wastewater is further promoted because the direction of rotation is reversed every time the wastewater is moved to the next step. Therefore, as shown in FIG.
! ! In the circulating waterway type sewage purification device '10 with stacked shrines,
The sewage is circulated in an aerobic state through repeated stirring and mixing, and the purification effect is sufficiently imparted and received through contact with the biofilm, so that an excellent purification effect can be exhibited. In addition, in Fig. 3, 40 is a non-woven material made of synthetic resin (41).
A permeable soil retainer is coated on the upper surface of the contact filter media layer through the contact filter media layer.
, Ll... is coated on the top surface of the circulation 1 purchase channel to prevent odors, detergent foam, and pathogens from spreading outside the tank, and to prevent the water temperature inside the tank from being affected by the outside temperature. do. The contact a shrine according to the present invention is as described above, and if a large number of the contact a shrines of the present invention are installed in a stacked state against the flow of sewage flowing laterally in the circulation waterway, the sewage is guided by the curved surface of the spiral blade of each contact a shrine and is forcibly rotated within the cavity of the spiral blade, so that during this rotation, it is uniformly applied to the biofilm formed on the front and back surfaces of each spiral blade. While highly efficient purification can be achieved through contact, the turbulent flow caused by repeated swirling (1-) allows effective stirring and mixing, resulting in an excellent aeration effect and enhancing the purification effect. In addition, since there is little resistance to water flow, there is no need to worry about clogging, and by using a material with low strength, it has the advantage of being able to withstand long-term use and making it possible to perform purification in a labor-saving manner. It is possible to provide an optimal contact filter medium that satisfies all of the above-mentioned conditions (1). Together with the white color, it is suitable for use in various circulating channel type or long channel type sewage purification devices, including the device shown in the figure. 4. Brief explanation of the drawings Fig. 1 2 is a side view showing an embodiment of the contact filter medium according to the present invention, FIG. Figure 3 is a cross-sectional front view of a circulation water tank filled with a contact filter made of the contact filter of the present invention, Figure 4 is an explanatory diagram showing the swirling direction of wastewater with arrows, and Figure 5 is a It is a front view showing another embodiment of the present invention in which a plurality of spiral blades are used.

Claims (1)

[Claims] A contact a-shrine for sewage treatment characterized in that a single or plural spiral blades are integrally formed in the longitudinal direction of the peripheral surface of a central shaft using a material with excellent strength.