JPS641198B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present application relates to a method and apparatus for treating wastewater such as sewage and industrial wastewater.

(Prior art and its problems) Conventional wastewater treatment devices include long-time aeration systems, oxidation groove vertical systems, oxidation groove horizontal systems, rotary plate contact systems, soil systems, and contact aeration systems.

However, the long-time aeration method, contact aeration method, and soil method all require an aeration tank, which increases equipment costs. There was also the problem that power consumption was high because it required a blower for aeration, etc.

In addition, the oxidation groove rigid type, oxidation groove horizontal type, and rotary plate contact type require oxidation grooves and rotary plate contact tanks, respectively, so the equipment is large-scale, and when the BOD load is low, over-aeration may occur. This necessitated intermittent operation, which not only resulted in poor operating efficiency, but also increased power consumption and wasted energy.

(Technical Problems to be Solved by the Invention) The technical problems of the present invention to solve the above problems are to efficiently treat wastewater and reduce equipment costs by reducing the equipment of wastewater treatment equipment. The aim is to save power consumption by increasing wastewater treatment efficiency through more efficient operation.

(Technical means for achieving the technical problem) The technical means for achieving the above-mentioned technical problem is that in the first invention, the wastewater introduced into the regulating tank is transported through an inclined water channel whose downstream side is arranged at a high slope. The wastewater is mixed with air and aerated while being conveyed upward in an aeration channel consisting of an air mixing conveyor, and the aerated wastewater is returned to the adjustment tank, and the wastewater in the adjustment tank is purified by aeration while repeating the above-mentioned process again. The process is to advect the aerated and purified treated water to a settling tank.

In the second invention, an aeration feed channel consisting of an inclined feed channel for wastewater and an air mixing conveyor is arranged with a high slope on the downstream side, extending from a regulating tank into which wastewater is introduced to a settling tank provided on the downstream side of the regulating tank. First, a wastewater circulation path is provided from the downstream end of the aeration channel to the adjustment tank.

(Function) The wastewater in the adjustment tank is not only mixed with air and aerated while being transported upward by the aeration channel, but also by the upward flow caused by the air mixing conveyor in the aeration channel.
Aeration efficiency is promoted by violently colliding with the downward flow due to gravity. By returning this aerated wastewater to the adjustment tank and purifying it with aeration while repeatedly circulating it in the same manner as above, the purification efficiency is improved, and the treated water that has been purified to a fairly high level is sent to the settling tank. is advected to

(Effects of the Invention) The present invention exhibits the following effects by having the configuration as described above.

The wastewater in the adjustment tank is not only mixed with air and aerated while being transported upward by the aeration channel, but also the upward flow by the aeration channel and the downward flow due to gravity collide violently, promoting aeration efficiency. Ru. Therefore, the dissolved oxygen concentration (DO) of the wastewater being transported upward through the aeration channel quickly rises to near the saturation value and is purified without being pressurized and purified using compressed air.

Return the aerated wastewater as described above to the adjustment tank,
By carrying out aeration purification while repeatedly circulating the water in the same manner as above, the purification efficiency is improved, and the treated water that has been purified to a fairly high degree can be advected to the settling tank. Therefore, the load on the sedimentation tank can be reduced, and highly purified supernatant water (purified water) can be efficiently discharged.

Since equipment such as an aeration tank, an oxidation tank, and a blowing device is not required, the equipment of the wastewater treatment equipment can be reduced, and the equipment cost can be reduced.

By improving the aeration efficiency and purification efficiency, wastewater treatment efficiency can be increased through efficient operation, and power consumption can be saved.

(Example) An embodiment of the present invention will be described with reference to the drawings.

The wastewater treatment device A of the present invention has a regulating tank 1 and a settling tank 2.
and an aeration waterway 3.

The regulating tank 1 consists of a wastewater storage tank 4 and a wastewater channel 5 provided around the water storage tank 4, and is connected to an adjacent inflow wastewater treatment chamber 6 by a transfer pipe 7, so that the wastewater flowing into the treatment chamber 6 is passed through the transfer pipe. The water is transferred into the water tank 4 by a pump 8 provided at the end of the water tank 7 .

A water tank water level gauge 9 and a water level gauge 9 are installed in the water tank 4.
A discharge motor operated valve 10 is provided which is electrically connected to the wastewater discharge valve 10, and when the wastewater transferred from the treatment chamber 6 reaches a certain water level, the discharge motorized valve 10 opens and is discharged into the waste water channel 5.

The waste water channel 5 is connected to the settling tank 2 via the aeration channel 3, and the waste water in the waste water channel 5 is transferred into the settling tank 2.

Furthermore, in the waste water channel 5, a DO sensor 12 and a waste water level gauge 13 are provided which are electrically connected to a controller 11 to be described later and measure the dissolved concentration of oxygen (DO) in the waste water. When the wastewater discharged from 4 reaches a certain water level, it is transferred by the aeration water channel 3.

The aeration channels 3 are inclinedly arranged on both sides of the waste water channel 5 with the water storage tank 4 in between, and are joined at the downstream end thereof and connected to the sedimentation tank 2.

The confluence section 14 is provided with a waste water circulation path 15 that branches off from the aeration channel 3 and communicates with the waste water channel 5 of the regulating tank 1, and an air ejector section 17 is formed in the confluence section 14. In addition, the aeration channel 3 on the upstream side of the confluence part 14 is set at an angle of about 30° to the downstream end.
By increasing the height by 35 degrees and slanting the arrangement, an inclined water supply channel 3a is formed, and the inclined water supply channel 3a
An air mixing conveyor 16 is tilted inside.

The air mixing conveyor 16 has a spiral fillet 16a over its entire length, is installed in an inclined manner within the inclined water supply channel 3a by means of fixtures 16b provided on both sides of the inflow and outflow sides of the inclined water supply channel 3a, and is connected to the controller 11. It is rotated by an electrically connected motor 18 to upwardly transport the wastewater in the wastewater channel 5, and aerates the wastewater being mixed with air while being transported upwardly. As wastewater is being transported upward, its upward flow and downward flow due to gravity collide violently, promoting aeration efficiency.

The wastewater circulation path 15 is for returning the wastewater that has been raised and transported from the wastewater channel 5 of the regulating tank 1 to the wastewater channel 5 of the regulating tank 1, and includes the air ejector section 17 and an air mixer section 19 in the middle thereof. is provided, and the air sucked into the wastewater by the air ejector part 17 is mixed by the air mixer part 19 to increase the amount of dissolved oxygen.

The air ejector section 17 is provided with an air ejector 20 having an electric damper 20a electrically connected to the controller 11. 20
a is automatically adjusted and air is inhaled.

The controller 11 includes a dissolved oxygen concentration meter 21,
It consists of an electronic controller 22, a motor potentiometer 23, and a static frequency converter 24.
Sensor 12, electric motor 18, and electric damper 20 are each electrically operated.

When the wastewater transferred to the water storage tank 4 in the adjustment tank 1 reaches a high water level, it flows into the wastewater channel 5 provided around the water storage tank 4, and when the wastewater reaches the upper limit water level of the wastewater channel 5. The air mixing conveyor 16 of the inclined waterway 3a is started by driving the electric motor 18.

At this time, the dissolved oxygen concentration of the wastewater in the wastewater channel 5
DO is measured by the DO sensor 12, and the value is displayed by the dissolved oxygen concentration meter 21 of the controller 11.

The rotation speed of the electric motor 18 of the air mixing conveyor 16 is controlled by the motor potentiometer 23 according to the deviation between the DO value and the DO value preset by the electronic controller 22. However, if the DO value does not reach the set value even if the rotational speed of the electric motor 18 reaches the maximum, the static frequency converter 24 automatically adjusts the opening and closing of the electric damper 20a to allow air to flow in.
This is mixed in the air mixer section 19, oxygen in the air is mixed into the wastewater, and the DO value is increased.

If this is still insufficient, use the electric damper 20a.
is further automatically adjusted until the set DO value is reached. Then, as the DO value approaches the set value, the rotation speed of the electric motor 18 decreases.

The wastewater mixed with air in the air mixer section 19 as described above is returned to the waste water channel 5 in the adjustment tank 1, and by repeating such circulation, the purpose is to remove BOD (biochemical oxygen demand). reach.

The treated water that has achieved the purpose of removing BOD is advected into the settling tank 2.

In addition, the treated water advected into the settling tank 2 is equivalent to the amount of inflowing wastewater, the excess sludge in the settling tank 2 is transferred to an outdoor storage thickening tank (not shown), and the returned sludge is transferred to the waste water channel 5. send it back to

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view of the present invention, and FIG. 2 is a partially cutaway plan view. In addition, in the figure A...wastewater treatment equipment, 1...adjustment tank, 2
... Sedimentation tank, 3... Aeration waterway, 3a... Inclined waterway,
16...Air mixing conveyor.

Claims (1)

[Scope of Claims] 1. Wastewater introduced into a regulating tank is mixed with air and aerated while being conveyed upward in an aeration channel consisting of an inclined water channel whose downstream side is highly inclined and an air mixing conveyor. Return wastewater to the adjustment tank,
A wastewater treatment method in which the wastewater in this adjustment tank is repeatedly circulated in the same manner as described above to be aerated and purified, and the aerated and purified treated water is transferred to a settling tank. 2. An aeration channel consisting of an inclined waste water channel and an air mixing conveyor is arranged with a high slope on the downstream side, extending from the regulating tank into which wastewater is introduced to the settling tank provided downstream of the regulating tank. A wastewater treatment device with a wastewater circulation path extending from the downstream end of the aeration channel to the adjustment tank.