JPS5813231B2 - wastewater treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention treats wastewater under aerobic conditions through aeration, and generates activated sludge through activation by microorganisms and agitation of the treated water. It relates to a device that can be improved by adding, increasing stirring, etc.

Conventionally, aerobic treatment of wastewater is performed by aeration by blowing air, and it has been proposed that the effect is brought about by adding activation of microorganisms.

Even with such treatment, it is difficult to completely remove BOD and solid inclusions, and the amount of air required is large, often requiring large-sized equipment.

In particular, it is difficult to treat sludge with a high concentration of BOD in a short time using a simple device and to remove generated sludge.

In view of the drawbacks of the prior art, an object of the present invention is to provide a simple device that can efficiently purify high-concentration BOD wastewater in a short period of time.

It is also an object to significantly improve activation, improve generation of activated sludge, and facilitate separation.

It is also an object to provide a device that increases the aeration efficiency and improves the aeration method to improve the contact between the gas and the wastewater.

An overview of the present invention will be explained.

At least two or more partitions are provided in the tank as a wastewater treatment tank, and the wastewater is discharged through each partition.

In addition, gas such as aerated air is discharged as much as possible, fresh air is forcibly blown, and oxygen is constantly supplied to facilitate activation.

The partition part has a partition plate fixed in the tank and a plate installed on a rotatable shaft that separates the wastewater and gas phase in the tank, so that the wastewater sent in flows out to the next partition part. The flow should pass through the edge of the partition plate to prevent short-circuit flow.

In addition, the gas, mist, and the air-water mixture that has jumped onto the water surface together with the gas pass through the edges of the partition plate and flow into the next partition without being short-circuited.

In addition, light is irradiated on the water surface and the air-water mixing area near the water surface,
In order to improve the activation of microorganisms, increase the temperature of the irradiation part, and apply an electric field in each compartment with an atmosphere containing a large amount of air and water mixture, to cause migration of the contact surface between gas and water and increase the contact area. allow it to work.

In this way, aeration by blowing air from the bottom of the tank, irradiation with the light, applying an electric field, forced gas exhaust and exhaust, and passage of wastewater through the partitions are all carried out appropriately and rationally, improving wastewater treatment. This was carried out efficiently using a simple device, making it possible to produce effects such as solid discharge, BOD removal, and reduction in the amount of air used.

Next, one embodiment of the present invention will be described.

FIG. 1 is an exemplary side cross-sectional view of one embodiment of the present invention.

This example deals with the treatment of food processing wastewater.

The wastewater to be treated has a BOD of 1,500 to 3,000 p.
It was pm.

The water to be treated W1 is fed into a tank 1 equipped with an aeration device of the present invention.

It is sealed by a cover 5.

In Figure 1, the water surface at rest is at the level W shown by the dotted line.
It is 11.

In the tank, as shown in the figure, a fixed partition plate 4 is provided at the bottom of the tank 1 which is fixed and stationary, and movable plates 3 are arranged and arranged on a rotatable shaft 2 so as to fit between the partition plates 4.

The shaft 2 is rotated by a motor 6.

The supply wastewater W1 flows from the upper end of the partition plate 4 to the next location, flows down the moving plate 3, flows up from the lower end of the moving plate 3, passes through the upper end of the next partition plate 4, and flows in a staggered manner one after another. Sent to the next room,
During this period, the rotating plate 3 moves between the air above the tank and the water to be treated, thereby receiving stirring and aeration effects, and is treated with activated sludge under aerobic conditions.

The treated water W2 flows out to the next separation tank 12.

In each partition, unlike the static water surface Wl1 of the aerated wastewater, the wastewater surface, which is filled with bubbles and moves up and down, is treated in a state where an air-water mixture and microorganisms are densely present.

On the other hand, the gas blown to the top is forcibly exhausted to the outside of the system through the exhaust pipe 8 outside the tank.

On the other hand, the inside of the apparatus is filled with fresh air forcedly blown by the blower 7, which enhances the aeration effect by the rotary moving plate 3 and improves the activated sludge treatment effect.

Further, this forced airflow is accompanied by rising gas due to aeration, which enhances the exhaust effect from the exhaust stack 8.

A light source 9 such as a lamp is arranged between each movable plate 3 arranged on the rotating shaft 2 to emit light.

By irradiating the light from this light source 9, the activation of microorganisms in the irradiated area is improved, the temperature in the vicinity is increased, and the activated sludge adhering to the moving plate 3 proliferates, and this aeration, activation, and treatment Contributes to improving efficiency.

Further, an electrode 10 is inserted into the air between each moving plate, and a high voltage current 11 is applied to form a high voltage electrostatic field toward the moving plate 3, increasing the moving speed and adsorption speed of atmospheric oxygen, and increasing the gas It acts to substantially increase the collision area of contact with water, and significantly contributes to improving the water treatment effect.

When wastewater is treated in this way and compared with conventional treatment, the results are as shown in the following table.

Separation in W2 is based on conventional methods.

Comparing the above comparison table, the present inventions (1), (2),
(3) can be achieved using approximately 1/2 to 1/3 of the processing time in order to obtain the same level of ppm using the conventional apparatus.

In addition, not only is high-concentration BOD treatment possible,
The load factor is high and the amount of air is almost 1 compared to the conventional case.
A small amount of 1/8 to 1/4 is sufficient.

Although the above-mentioned embodiment uses a rotationally movable plate, it is also possible to process the liquid by moving it between shelf-type fixed plates.

In this case, air blowing is required for aeration.

Furthermore, if a trickling filter method is used for fixed plates, aeration and treatment can be carried out without the need for special equipment for blowing air.

As already mentioned, by using the device of the present invention, high concentration BOD wastewater can be treated in a short time using a small and simple treatment tank.
It has a high load factor and uses significantly less air consumption,
Suspended solids removal rate is also significantly improved.

It is often used to treat food processing wastewater, which has been difficult to treat using conventional methods, and has very good effects.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side sectional view of one embodiment of the present invention. 1...Treatment tank, W1...Wastewater to be treated,
W11... Static level, W2... Treated water, 2... Rotating shaft, 3... Rotating moving plate with shaft, 4...・Partition plate, 5...Cover,
6...Rotating motor, 7...Blower, 8
...Exhaust stack, 9...Irradiation light source, 10.
... Electrode, 11 ... High voltage power supply, 12 ...
...Sedimentation tank.

Claims (1)

[Claims] 1. To avoid short-circuiting the wastewater to be treated by passing between a plurality of fixed partition plates fixed in the wastewater treatment tank or between the movable plate fixed to the rotating shaft and the end of the fixed partition plate and bending. A wastewater treatment system that is equipped with a light source that irradiates light toward the fixed plate or movable plate of the wastewater treatment equipment that processes water while aerating it by passing it through a partitioned room one after another, and is also equipped with electrodes that form and act on an electric field. Device. 2. The wastewater treatment apparatus according to claim 1, wherein the light source uses a light source with a wavelength of approximately 2,500 to 10,000 angstroms. 3. The wastewater treatment device according to claim 1, which uses 3 to 50 KV as an electric field forming power source applied to the electrodes.