JP4019209B2 - Water purification system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water purification system used for purifying sewage containing organic pollutants such as sewage.
[0002]
[Prior art]
Conventionally, methods for decomposing pollutants by bacteria have been widely used to purify wastewater containing organic pollutants, and representative examples include an activated sludge method and a biofilm method.
[0003]
[Problems to be solved by the invention]
These conventional methods have a problem in that they require complicated equipment including a processing tank, piping and the like and a large space, and the aeration needs to be performed continuously, so that the running cost is high. Under such circumstances, development of a method capable of purifying sewage at low cost with simple equipment is desired.
[0004]
[Means for Solving the Problems]
Therefore, the present applicant has developed the following water purification system. That is, in the water purification system according to the present invention, a spiral conduit arranged so that the central axis of the spiral is oriented in the vertical direction is filled with a granular carrier impregnated with bacteria, and sewage is discharged from one end of the conduit. In the water purification system configured to be taken out from the other end, the carrier is divided into a plurality of filling chambers at approximately equal intervals by a perforated plate and filled in the plurality of filling chambers. The particle diameter of each of the filling chambers gradually decreases from the upstream filling chamber to the downstream filling chamber, and a carrier inlet is provided on the upstream side of each filling chamber, and a carrier outlet is provided on the downstream side. The outlet is characterized by providing a watertight door.
[0005]
When sewage is introduced from one end of the conduit, the sewage flows through the gap between the carrier in the conduit and the other end of the conduit. During this time, the fixed pollutant mixed in the sewage is filtered by the carrier, and the pollutant such as organic matter dissolved in the sewage is decomposed by bacteria. Thereby, the purified clean water is taken out from the other end of the conduit.
[0006]
When the conduit is spiral, the conduit having the required length can be disposed in a narrow space, and the flow of sewage is smooth and does not cause stagnation, so that the contaminants are filtered and decomposed satisfactorily. In addition, when the conduit is arranged so that the central axis of the spiral is oriented in the vertical direction, the sewage flows through the conduit under its own weight, so that a pump for flowing the sewage is unnecessary.
[0007]
Forming the carrier with a porous fired product made from sludge generated at the site of collecting the sewage to be purified is preferable because favorable conditions can be obtained as an environment in which bacteria grow and proliferate.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on the embodiments shown in the drawings.
FIG. 1 is a diagram showing an installation state of a water purification system according to the present invention, in which a spiral conduit 1 is provided with a central axis OO oriented in a vertical direction, and sewage is supplied to an upper end opening of the conduit 1. A pipe 2 is connected, and a drain pipe 3 is connected to the lower end opening.
[0009]
Inside the conduit 1, three perforated plates 4 are provided at substantially equal intervals from the upstream side to the downstream side, and the interior of the conduit 1 is partitioned into four chambers A, B, C, and D. Yes. Each chamber is filled with a granular carrier 5 impregnated with bacteria. The particle size of the carrier 5 is the largest in the uppermost A chamber, and the smaller the B chamber, the C chamber, and the D chamber. The hole diameter of each perforated plate 4 allows water to pass but not the carrier 5. Corresponding to each of the chambers A, B, C and D, there are provided inlets 6a, 6b, 6c and 6d for inserting the carrier 5 and outlets 7a, 7b, 7c and 7d for taking out the carrier 5, respectively. Yes. These inlets and outlets are provided with watertight doors.
[0010]
The carrier 5 is a fired product of ceramic, zeolite, or the like made from sludge generated at the collection site of the sewage to be purified, and has a porous structure as shown in the enlarged sectional view of FIG. For this reason, when the carrier 5 is impregnated with the bacterial solution, the bacteria enter the pores 5a of the carrier 5, and the carrier 5 becomes a good growth bed of bacteria. Since the carrier 5 is made of sludge generated at the site of collecting the sewage to be purified, it is a favorable condition as an environment in which bacteria grow and proliferate. Moreover, by using sludge, the amount of sludge is reduced and it is useful also to reduce the treatment of sludge. The carrier 5 is preferably impregnated with a bacterial solution immediately before use in order to maintain the vitality of the bacteria.
[0011]
The type of bacteria impregnated in the carrier 5 may be selected appropriately depending on the type of contaminant contained in the water to be treated. For example, it is effective to use aerobic bacteria and anaerobic bacteria together. In that case, if the carrier 5 has a porous structure, aerobic bacteria live near the surface of the carrier 5 and near the entrance of the holes 5a, and anaerobic bacteria live deep inside the holes 5a. This is convenient because it can be divided into two categories. Moreover, you may use the characteristic substances other than organic substance, for example, bacteria which decompose | disassemble environmental hormones and dioxin.
[0012]
When the carrier 5 impregnated with bacteria is filled in the conduit 1 and the sewage is supplied to the conduit 1 from the sewage supply pipe 2, the sewage passes through the A chamber, the B chamber, the C chamber, and the D chamber in that order. The mixed fixed contaminants are filtered out on the carrier 5. In addition, pollutants such as organic matter dissolved in the sewage are decomposed by bacteria. Thereby, the purified water which was purified is taken out to the drain pipe 3. If the carrier 5 filled with the fixed contaminants filtered out or the bacterial film peeled off from the surface of the carrier 5 becomes clogged, the inlets 6a, 6b, 6c, 6d and the outlets 7a, 7b 7c, 7d may be replaced with a new carrier 5.
[0013]
Moreover, in the said embodiment, the pump for flowing sewage is arrange | positioned by arrange | positioning the helical conduit | pipe 1 with the attitude | position in which the central axis OO faces a perpendicular direction, and letting sewage flow through a conduit | pipe with dead weight. Although not required, the conduit 1 may be arranged in a posture in which the central axis OO is slightly inclined with respect to the horizontal direction. In this case, wastewater can be treated slowly according to the degree of inclination.
[0014]
【The invention's effect】
As described above, in the water purification system according to the present invention, when sewage is introduced from one end of the spiral conduit, the sewage sequentially passes through the respective filling chambers partitioned by the perforated plate, and enters the filling chamber. Since the particle size of the carrier to be filled is gradually reduced from the upstream filling chamber to the downstream filling chamber, the fixed contaminants mixed in the sewage during that period are sequentially filtered from the largest to the carrier. Moreover, pollutants such as organic matter dissolved in the sewage are decomposed by bacteria, and the drainage pipe has a function of taking out purified clean water. If the carrier filled with fixed contaminants filtered out or bacterial membranes peeled off from the surface of the carrier becomes clogged, it can be easily replaced with a new carrier using the inlet and outlet. Can do. Moreover, since the conduit is spiral, the required length of conduit can be arranged in a narrow space, and the flow of sewage is smooth and does not cause stagnation, so that contaminants are filtered and decomposed well. Because the central axis of the spiral is in the vertical direction, sewage flows through the conduit by its own weight, no pump is required to flow the sewage, aeration is not required, equipment is simple, and it can be installed in a narrow space This is a system that does not require much maintenance costs.
[Brief description of the drawings]
FIG. 1 is a diagram showing an installation state of a water purification system.
FIG. 2 is an enlarged cross-sectional view of a carrier.
[Explanation of symbols]
1 Conduit 2 Sewage supply pipe 3 Drain pipe 5 Carrier

Claims (1)

A helical conduit placed so that the central axis of the spiral is oriented in the vertical direction is filled with a granular carrier impregnated with bacteria, and sewage is introduced from one end of the conduit and water is configured to be taken out from the other end . In the purification system, the inside of the spiral conduit is divided into a plurality of filling chambers at almost equal intervals by a perforated plate, and the particle size of the carrier filled in the plurality of filling chambers is set downstream from the upstream filling chamber. The carrier inlet is provided on the upstream side of each filling chamber, the carrier outlet is provided on the downstream side, and a watertight door is provided at the inlet and outlet. purification system for water, characterized in that the

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