JPS60143887A - Apparatus for purifying filthy water - Google Patents

Abstract

PURPOSE:To separate impurities from water surely and to improve recovering efficiency of impurities by providing many nozzles for ejecting aqueous liquid contg. atomized air toward the bottom of a duct tank to the inside bottom of a duct tank for the filthy water. CONSTITUTION:Aqueous liquid contg. atomized air is passed through a main pipe 7 and is ejected from nozzles 6 of each ejection pipe 5 into a duct tank 1 for filthy water. Since the water contg. atomized air is ejected toward the inside bottom of the duct tank 1 for the filthy water, relatively heavy sludge which is liable to settle to the inside bottom of the duct tank 1 for the filthy water is also floated, and the atomized air is adsorbed to the sludge to float all sludge to the surface of the water in the duct tank 1 for the filthy water. The floated sludge moves toward a conveyor 15 in accompany with water stream moving toward a discharge port 2 of water, and is recovered successively by the driving of the conveyor 15.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewage purification device that uses a centrifugal pump to purify sewage containing sludge and the like.

A wide variety of devices have been proposed as means for separating the solid waste contained in wastewater such as sludge and purifying the wastewater, but none of them have been generally adopted in the past. At present, the means for separating solid waste from water are those that use filters, pressurized aeration flotation, and the like. However, because filters are easily clogged with solid matter, it is necessary to clean or replace the filters at regular intervals, making it impossible to continue treating wastewater over a long period of time. Pressurized aeration flotation is inconvenient, requires high costs for pressurization, and is difficult to process continuously in large quantities.

In addition, solid waste that is relatively heavy in specific gravity settles at the inner bottom of the sewage tank, making it necessary to periodically clean the sewage tank to remove the sediment. There was a point.

The present invention has been made to solve this problem, and it injects aerated water that is atomized from the inner bottom of a sewage tank, and causes the atomized air to be adsorbed to impurities such as sludge contained in the sewage. It is an object of the present invention to provide a sewage purification device that purifies sewage by floating impurities and then recovering the floating impurities.

That is, the present invention is configured to send atomized air into wastewater, cause the air to adhere to impurities such as sludge in the wastewater, float the impurities, and recover the floated impurities. Separation of impurities and water is reliable, improving the collection efficiency of impurities.Furthermore, since the impurities are floated by the jet flow by setting the spray angle appropriately, there is less sediment, making it easier to clean inside the sewage tank. It has the advantage that it can be simplified.

The present invention will be described in detail below based on examples shown on the meat side.

Reference numeral 1 denotes a sewage treatment tank, and the sewage treatment tank 1 is provided with a water inlet 2 at the upper part of one side, and a water inlet 6 at the lower part thereof. Further, a waste water inlet 4 is provided on the other side farthest from the water inlet 2. Reference numeral 5 denotes a large number of air-mixed water injection pipes arranged at the inner bottom of the sewage flow path tank 1, and each injection pipe 5 is used to direct air-mixed water downward at an angle of approximately 45 degrees and immediately spray the sewage water. A nozzle 6 is formed that can spray water toward the inner bottom surface of the channel tank 1.

Reference numeral 7 denotes a main pipe disposed outside the sewage channel tank 1, to which each of the injection pipes 5 described above is connected, and the wide width of the main pipe 7 is connected to a vortex pump for mixing gas and liquid. It is connected to the discharge port 9 of 8. An automatic air suction valve 12 having an air suction port 11 and a water suction pipe 16 connected to the water suction port 11 are connected to the suction port 10 of the centrifugal pump 8. 14 is a motor for driving the centrifugal pump 8, and 15 is a conveyor for collecting sludge 16 and the like floating in the wastewater channel tank 1.

The above is the configuration of this embodiment.Next, its operation will be described.When the volute pump 8 is driven while supplying sewage water into the sewage channel tank 1 from the sewage inlet 4, the inside of the vortex pump 8 is In this case, the water liquid supplied from inside the sewage channel tank 1 through the water inlet 6 and the water suction pipe 13 is mixed with the air sucked in from the automatic air intake valve 12, and then this centrifugal pump 8
The air and the water are mixed by the impeller inside, and the finely divided air is mixed into the water. (
(It is desirable to adjust the air intake port 11 of the automatic air intake valve 12 so that the mixing ratio of this air is 10 to 20%.) Thus, the water liquid mixed with the atomized air passes through the main pipe 7. From the nozzle 6 of each injection pipe 5, the wastewater flow path 4t
This air-mixed water is injected into the wastewater channel tank 1.
Because it is injected toward the inner bottom of the sewage channel tank 1, relatively heavy sludge, etc. that would have settled at the inner bottom of the wastewater channel tank 1 also floats to the surface, and the atomized air is adsorbed (attached) to the surface of the sludge. All the sludge is transferred to wastewater channel tank 1.
Can be floated on the surface of the water. The sludge etc. thus suspended moves in the direction of the conveyor 15 along with the water flow flowing in the direction of the flowing water 02.
It is also possible to separate and guide the flow path of the upper sludge floating part and dewater it using a filter press or the like without using a belt conveyor. The water from which impurities such as sludge have been removed is sequentially passed through the water outlet 2.
However, this effluent water can be discharged or reused as wastewater, and if necessary, this effluent water may be subjected to secondary drug treatment or biological treatment. According to the present invention, the air particles mixed into the water are extremely fine particles and stay in the water for a long time, so the depth of the sewage channel tank 1 is determined by taking into consideration the floating time of the air. , you need to set the length. Further, since it is desirable that the injection pressure from the nozzle 6 be high, it is better to use a centrifugal pump as large as possible.

As described above, the present invention provides an aqueous jet that mixes atomized air toward the inner bottom of a wastewater channel tank into which wastewater mixed with impurities such as sludge flows. Because it is equipped with a large number of nozzles, the atomized air ejected from the nozzles adheres to impurities in the wastewater and can float these impurities.
The impurities contained in the wastewater are effectively separated and floated, thereby facilitating the separation and recovery of the impurities. Furthermore, according to the present invention, since the air-mixed water is injected toward the inner bottom surface of the wastewater channel tank 1,
Due to the jetting force, no sediment is generated in the sewage channel tank 1, and the cleaning work inside the sewage channel tank 1 can be saved.

[Brief explanation of the drawing]

The drawings all show embodiments of the sewage purification apparatus according to the present invention, with FIG. 1 being an explanatory structural view showing the entire structure, and FIG. 2 being an enlarged sectional view of the main parts thereof. 1... Sewage flow path N 2... Water inlet 6... Water absorption 0 4-... Sewage inlet 5... Air mixed water injection pipe 6... Nozzle 7... Main pipe 8... Centrifugal pump 9...Discharge port 10...Suction port 11...Air suction port 12...Automatic air suction valve 16
... Water suction pipe 14 ... Motor

Claims (1)

[Claims] It is arranged at the inner bottom of the sewage flow path tank 1, and the air-mixed water is
A large number of air mixing water injection pipes 5 are provided with nozzles 6 that can inject toward the inner surface of the sewage flow path tank 1, and air is mixed with the water taken from the sewage flow path tank 1, and atomized air is mixed. A whirlpool pump 8 that injects water from the nozzle 6, a conveyor 15 that collects and removes impurities floating on the sewage in the sewage channel tank 1, or a dewatering device that separates only the floating upper part of the sludge. A sewage purification device characterized by being capable of dewatering.