JPH0137195B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) There is a significant difference in the sewerage penetration rate between urban areas and towns and villages in Japan. In recent years, the population of towns and villages has increased due to regional development, and the amount of domestic wastewater has increased, but in reality, there is no delay in dealing with this, and almost all of it is being drained away. The problem of contamination of rivers, lakes and marshes that are closely connected to daily life is occurring frequently.

In other words, as the wave of modern industrialization swept through rural areas, mixed housing progressed, and waste that had previously been disposed of within the home began to be discharged outside. Therefore, with the increasing use of daily life, gray water is becoming more and more
It has come to pollute streams that used to be clear streams. Such water pollution is not only unsanitary, such as causing bad odors and mold flies in the area, but also deteriorating the quality of agricultural water and increasing nutrients such as nitrogen and phosphorus, which are harmful to agricultural products. In addition to disrupting fertilizer management, pollution of rivers, lakes, and marshes is accelerated, worsening conditions for the survival of aquatic animals and plants, and causing great damage.

The present invention relates to an aeration method that is installed in a specific site to purify domestic wastewater, and in particular to impregnate and melt oxygen into the wastewater to promote the self-cleaning action of the wastewater. By making use of the natural head of water without requiring any mechanical elements, or by creating a head of flowing water artificially using a pump, the oxygen from the air that is drawn into the water as it falls is dissolved in the waste water. The present invention is characterized in that the waste water is purified thereby.

(Prior art) Conventional aeration methods of this type include a blow method in which air is sent directly into wastewater, and a mechanical method in which air is infiltrated by mechanically rotating a rotor in the form of a rotor near the surface of the water. There is. In addition, the mechanical methods include those using a horizontal rotor (for example, the Ebara OD system manufactured by Ebara Corporation), those using a vertical rotor (for example, the all-rotor system manufactured by Organo Corporation), and the blow method. There are systems that have both the same qualities as the rotor system (for example, the Hitachi Oxidation Date System manufactured by Hitachi Kiden Industries, Ltd.).

(Problems to be Solved by the Invention) Among the conventional methods described above, the blow method in which air is sent directly into wastewater is extremely inefficient and not only has poor oxygen dissolution efficiency, but also requires a large air delivery mechanism. Because of this, together with the complexity of the piping, manufacturing costs were high, and the manpower and economic burden for management and maintenance was significant.

In addition, although the above-mentioned mechanical method has superior efficiency compared to the above-mentioned blow method, the manufacturing cost is high due to the large number of mechanical elements.
Moreover, maintenance and management required advanced techniques and was extremely complicated, and furthermore, there were some problems from the viewpoint of energy conservation. The present invention is characterized in that it attempts to eliminate the problems in the prior art as described above.

(Means for Solving the Problem) The present invention divides an endless waterway by partition walls, pumps flowing water in front of the partition wall to a required height via a submersible pump, and directs it to the front of the partition wall. Aeration is caused by the falling water, and the falling water flow is made to circulate in the endless waterway based on the flow force caused by moving it from the front side to the front side of the partition wall. This relates to an aeration method that relies on water flow.

(Example) Regarding the apparatus used for implementing the method according to the present invention,
The embodiment shown in the drawings will be described in detail below.

In the figure, reference numeral 1 denotes an endless waterway, and walls 2 for closing the waterway are provided at necessary locations.

Reference numeral 3 denotes a submersible pump installed in front of the above-mentioned painting wall 2, and the pump 3 pumps up the running water in front of the painting wall 2 to a required height and supplies it by falling to the front of the painting wall 2. It is something. That is, when the flowing water in the endless waterway 1 reaches the painting wall 2, it is pumped up via the submersible pump 3 and transferred to the front of the painting wall 2, thereby creating a fluid force, and the flow is It is configured to circulate within the endless waterway 1 without being hindered.

Reference numeral 4 denotes a water pumping guide path formed at the upper part of the painting wall 2, which is used to once receive the water pumped up by the submersible pump 3 and drop it in front of the painting wall 2 with a predetermined head.

Reference numeral 5 denotes a purified water take-out pipe provided in the front part of the picture wall 2, and numeral 6 denotes a raw water introduction pipe provided in the front part of the picture wall 2.

As shown in Fig. 1, the endless waterway 1 having the above-mentioned configuration includes a raw water pump tank A for taking in waste water, a sand settling tank B for performing pre-treatment purification of the taken raw water, and a raw water pump tank A for taking in waste water. Raw water to be purified is taken in from the introduction pipe 6 through a shredder C etc. for crushing large garbage contained in the water, and the endless waterway 1
The water that has been purified is sent to the purified water outlet pipe 5.
At the same time, it is discharged through a sedimentation tank D and a disinfection tank E to a predetermined location.

Further, FIG. 5 shows another embodiment of the apparatus used for carrying out the method of the present invention, in which the endless water channel 1 has a double structure of an inner water channel portion 1a and an outer water channel portion 1b, A communication passage 1c is formed in the required portions of both water channels 1a and 1b, and the side walls thereof serve the same purpose as the above-mentioned picture wall 2.
A crossing guide path a is provided above the communication path 1c, and a submersible pump 3 is provided in a portion of the inner waterway portion 1a that is closed by the side wall surface of the communication path 1c, and the water pumped through the pump 3 is transferred to the crossing guide path. It is configured so that it is received by the outer water channel 1b and dropped with a predetermined head to the outer water channel 1b.

As mentioned above, the endless waterway has a double structure because
This is a means for increasing the length of the water channel using the minimum space, and implementation in such a form is also possible.

(Operation) When the method of the present invention is carried out using the apparatus shown in the drawings, the raw water that has undergone the necessary pretreatment is passed through the inlet pipe 6 in the state shown in FIG. The water is supplied into the endless waterway 1 and flows in the direction shown by the arrow in the figure. When the flowing water is stopped by the painting wall 2, it is pumped up through the submersible pump 3, and once received through the guide path 4, it falls in front of the painting wall 2 with a predetermined head. It happens. Therefore, endless waterway 1
The flowing water inside flows cyclically within the waterway 1 without being obstructed by the wall 2, and at the same time, as it falls while maintaining a predetermined head as described above, air is drawn in and the so-called aeration is carried out to dissolve oxygen in the air into the water. The effect is achieved and the water is purified. After applying such cyclical flow for the required time, it is discharged from the take-out pipe 5 and subjected to predetermined post-treatment, and then discharged into the river.
It is discharged into lakes, etc.

(Effects of the Invention) The present invention divides an endless waterway by partition walls, pumps flowing water in front of the partition walls to a required height via a submersible pump, and drops the water in front of the partition walls. Accordingly, aeration is generated, and the falling water flow is circulated in the endless waterway based on the flow force caused by moving it from the front side to the front side of the partition wall. Therefore, in carrying out the method of the present invention, It is possible to achieve aeration (oxidation and stirring of flowing water) effects simply by using a submersible pump without requiring a complicated structure or function.

In other words, the present invention not only completely solves the problem of the need for complicated air piping that occurs when air is directly fed as in the past, but also eliminates the need for machines that use rotors and impellers. Compared to the conventional method that relies on a conventional method, the method of the present invention requires only a submersible pump as the mechanical component used for carrying out the method, so the manufacturing cost of the equipment used is significantly reduced. Not only does maintenance and management become extremely easy and simple, but since sludge tends to adhere to rotor impellers, it was necessary to perform sufficient pre-treatment purification of the raw water. Since this problem does not exist at all, it is allowed to significantly simplify the pretreatment, and when rotors and impellers are used, the depth of the water channel can be increased to generate water flow force near the water surface. If it is too large, there is a problem that the fluidity deteriorates, but since the present invention can improve the flow in the pump pumping channel, it is possible to obtain fluidity regardless of the water depth. This is very advantageous in minimizing the installation area.

In addition, the present invention partitions the endless waterway by partition walls, pumps the flowing water in front of the partition walls to a required height via a submersible pump, and causes the water to fall in front of the partition walls, thereby achieving aeration. Since the head of the flowing water can be set arbitrarily based on the output of the submersible pump, compared to, for example, a case where it depends on natural fall based on the formation of a step,
It is possible to obtain aeration effects in an extremely rational manner and in a small space.

Furthermore, in the present invention, since the flowing water is circulated in the endless water channel based on the flow force caused by moving the water from the front side to the front side of the partition wall, by continuing the circulation for a predetermined time, It becomes possible to apply the purifying effect of aeration to running water as much as necessary. Therefore, according to the present invention, the degree of purification can be set arbitrarily.

[Brief explanation of drawings]

The drawings show an embodiment of the apparatus used for carrying out the method of the present invention, in which Fig. 1 is an explanatory block diagram showing an example of the usage of the apparatus, and Fig. 2 is a plan view of a portion of the apparatus. , Figure 3 is X-X in Figure 2
FIG. 4 is a sectional view taken along line Y--Y, and FIG. 5 is a plan view showing another embodiment of the device. 1... Endless waterway, 2... Painting wall, 3... Submersible pump, 4... Pumping guideway, 5... Purified water take-out pipe, 6... Raw water introduction pipe.

Claims (1)

[Claims] 1. The endless waterway is divided into bulkheads, and the flowing water on the near side of the bulkhead is pumped up to the required height via a submersible pump, and the water is dropped in front of the bulkhead to generate aeration, and the falling water flow is An aeration method using a falling water flow, characterized in that the flow is circulated in the endless waterway based on the flow force caused by moving the water from the front side to the front side of the partition wall.