JP2002186962A - Pressurized whirl type floatation and separation wastewater treatment equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wastewater treatment equipment capable of simultaneously and quickly performing a floatation treatment and a coagulation and sedimentation treatment. SOLUTION: The flow rate of a water to be treated is controlled by unequalizing pitches of a wastewater/contamination elevating spiral board 12 mounted inside the treatment equipment, a retention time required when a foamed floc is formed is secured, and a settling velocity of very fine solid particles contained in the wastewater in an inner cylinder can be shortened by a multistage pressurization and by promoting the generation of whirls by mounting a plurality of funnels 5, 25 against a stirring generated by impellers 7, 8 inside the inner cylinder 1 and a water flow generated by the impellers toward a bottom of an external container 24. In addition, since a filtering section 14 is affected by a negative force generated by the impellers, very fine solid particles contained in a permeated water are largely reduced. Consequently, the wastewater to be sent to a treated water discharging equipment 3 is of an extremely low load, resulting in enhancing both an ozonation in the treated water discharging equipment and a wastewater treatment efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for quickly floating and separating a pollutant from a wastewater in which water pollutants and the like generated in general households and various industrial fields are dissolved, and sterilization, decolorization and deodorization with ozone. The present invention relates to a sewage treatment apparatus capable of performing a treatment.

[0002]

BACKGROUND OF THE INVENTION In the field of sewage treatment in the field of sewage treatment, sewage treatment by separation of individual liquids involves a coagulation / precipitation treatment using an organic, inorganic or polymeric flocculant alone or in combination. Has been established, and in recent years, biocoagulants have been attracting attention as new coagulants. On the other hand, a levitation treatment based on a principle opposite to the above-described aggregation / precipitation treatment has been almost established in principle.

[0003] As an individual liquid separation device using mechanical elements,
Devices based on the principle of separation of individual liquids by centrifugal force, including screw decanter type and disk type, have been widely and generally recognized. Although the sewage treatment apparatus mainly composed of this apparatus has been adopted in a wide range of fields, it has not been spread to small-scale establishments due to its high cost and maintenance problems.

The treatment with ozone has long been used in Europe for the purpose of disinfecting drinking water. In Japan, studies on sewage purification have been conducted since late 1965. And the like.

[Prior art]

It is widely known that various flocculants or flotation agents are used alone or in combination in the current field of sewage treatment technology. A sewage tank, or an injection port is provided in a pipe portion to which the sewage is transferred, and the agent is injected alone or together with a gas, and the stirring and mixing process is completed by an impeller or a static type in-tube mixer or the like, and a flotation tank, or It is transferred to a sedimentation tank and shifts to an individual liquid separation step. However, the coagulation / precipitation treatment and the flotation treatment are based on different thoughts.

[0006] The basic concept of various centrifugal separators in the individual liquid separation process is that which is designed and developed based on the principle that the larger the resistance or the mass, the more affected the centrifugal force. Because there is always a part that rotates at high speed on the top, if separated solids etc. accumulate unequally in the rotating part, the rotational balance will be significantly impaired, and in the worst case, it may lead to destruction of the device In addition, defensive inspections will continue to be indispensable.

[0007] Among the published patents relating to flotation devices,
It is often the case that various chemical-mixed sewage is turbidized with gas using a helical pipe, and is applied to foam floc formation during the transition from the lower part to the upper part of the pipe, but the diameter is the same. Therefore, the flow rate remains constant. Therefore, the required retention for foam floc formation is not achieved.

[Problems to be solved by the invention]

[0008] Flotation treatment and flocculation with various flocculants, etc.
In order to perform a process of different character called precipitation process,
Appropriate processing agents must be set up for each. Therefore, the equipment cost and the maintenance cost are increased due to the enlargement of the treatment facility or the equipment itself, and it is impossible to widely demand the spread to individuals or small business establishments. Therefore, it is impossible to reduce the size of the apparatus itself unless one processing apparatus can simultaneously solve the different processing described above, and the downsizing leads to the above-mentioned cost reduction, and further compounding in the future If it is not possible to expand the range of support for various types of sewage treatment methods, it is not possible to hope for the spread of sewage treatment devices to the end.

[Means for Solving the Problems]

The invention based on the contents described in claims 1 to 4 is based on the premise that, as a basic precondition, a chemical treatment by the addition of various flocculants or a floating agent has already been performed in the pretreatment stage. The purpose of the present invention is to purify the individual liquid by quickly and surely forming a foam floc from the wastewater to be treated, and to purify the water quality more aggressively.

In the present invention, in order to shorten the time required for sedimentation separation, which is indispensable for individual devices employed in the conventional flotation separation or coagulation / sedimentation treatment, it is arranged at the center of the device. The multiple impellers provided inside the inner cylinder are used to agitate and overflow the water to be treated downward in the downward direction, and the funnel provided at the bottom of each impeller aggressively pressurizes and amplifies the flow rate to generate wastewater. Fine solid particles contained can be forcibly removed from the inner cylinder. Further, the filtration part provided at the upper part of the cylinder is always below the water surface set by adjusting the water level for discharging the treated water, and therefore, the water filled above the filtration part is treated as filtered treated water with water. I will say.

[0011] From the discharge port at the lower part of the inner cylinder, sewage in a state where the rotational force is maintained is jetted to a raised flow velocity promoting part provided at the bottom part of the outer container. In addition, a rectifying plate is provided on the raised portion for further promotion and clarification in the rotation direction. As a result, an upward countercurrent is generated together with the centrifugal force, so that the solid particles are transported upward while turning, and it is needless to say that the effect of the ozone treatment described in claim 4 is promoted.

The generated rising water flow is guided into a foam floc forming pipe formed by a spiral sewage contaminant raising spiral plate provided between the inner container and the outer container and having a gradually widened pitch. The pitch of this spiral plate is narrower in the lower part in order to secure the flow velocity and centrifugal force, and in order to improve the formation of foam flocs during the transfer of sewage to the upper part, the pitch is gradually increased as a flow velocity damping means for stagnation. It is set to be. The sewage to be treated is injected into the forming tube at a portion before the flow velocity of the forming tube is attenuated in a state in which various coagulants and a floating agent and gas are turbid.

【Example】

An embodiment of the present processing apparatus will be described with reference to the drawings. FIG. 1 shows the internal structure of a main body of the present treatment apparatus and a treated water discharger used in connection with the treatment apparatus.

In the pretreatment stage, the sewage, which has already been subjected to chemical treatment with various flocculants, flotation agents, etc., rises in a gas-liquid turbid state from the sewage inlet (4) to the inside of the treatment machine body. Is injected in a direction according to the rising angle of the spiral plate (12). When the gas-liquid turbidity is not present, the sewage inlet (4) is extended to extend the inner cylinder (1) and the secondary pressurized funnel (2).
5) Direct injection is performed by penetrating the side surface or the filter part (14) from the upper part of the inner cylinder (1). The required pressure for the sewage injection pressure is slightly higher than the water pressure generated by the impellers (7) and (8).

The height of the water intake (21), which has a vertical adjustment mechanism provided inside the treated water discharge device (3) and has a diameter considering the balance between the amount of inflow and discharge of wastewater, is set for the injected sewage. Thereby, the state is maintained at the optimum water level (L) for the collecting step of the belt type scum collecting device (16). At this point, the sewage in the inner cylinder (1) has a positive force on the lower part of the impellers (7) and (8). The upper part will be under the influence of a negative force, so that the solid particles contained in the sewage will always be rejected below the inside of the inner cylinder (1). The sewage discharged from the secondary pressurized funnel (25) forms a countercurrent with centrifugal force due to the action of the raised bottom of the outer container (24) and the rectifying plate (11). According to this principle, the solid particles are transferred together with the water stream to a foam floc forming tube constituted by a spiral plate (12) for raising sewage contaminants. The sewage is mixed with air or water containing ozone injected from the injection port (1M) at the time of occurrence of the upward countercurrent.

The solid particles in the sewage are transported into the foam floc forming tube together with the above-mentioned upward flow and centrifugal force accompanied by the centrifugal force, and are further chemically treated with various flocculants, flotation agents and the like injected from the sewage inlet. Also, it joins with the sewage subjected to gas-liquid mixing and rises. However, the only substances that rise are bubbles and solid particles, and the water level cannot rise.

The flow rate of the sewage in the foam floc forming pipe is set such that the pitch of the sewage contaminant is increased from the lower portion to the upper portion, and the sewage contaminant raising spiral plate (12) and the resistance provided on the spiral plate are provided. The plate (13) provides water flow regulation and flow velocity attenuation from the inside to the outside. According to this principle, each foam floc rises while fusing together, and most of the solid particles are collected together with the water flow in the scum storage tank (15) provided on the upper side surface of the outer container, and collected by the belt type scum collection device (16). Then, it falls into the collection container (17) installed immediately below the apparatus. The movement of the water during the ascent of the processing apparatus main body includes partial circulation by a plurality of internal circulation openings (9) provided in a portion where the flow velocity is low inside the spiral plate, and the inner cylindrical funnel (1).
0) and the secondary pressurized funnel (25) consist of the entire main circulation from the low flow rate part, and by repeating this movement, the wastewater is purified.

By passing through the filtration section (14), the first
The sewage that has undergone the stage purification is transferred to the lower part of the treated water discharger (3) by the transfer pipe (20). At this time, it is injected from the injection port (2M) provided at the lower part of the device.
After ozone sterilization and ozone decolorization treatment with air or water containing ozone, the ozone is passed through the filtration section (22) and then flows into the water intake (21) to be discharged from the drain pipe (23). The above is all the processing steps.

【The invention's effect】

In the present invention, the basic principle of centrifugation is used. In particular, by simplifying the principle of separating individual liquids of the screw decanter type, the price of the device itself is reduced, and by applying this principle, separation into fine solid particles, which was insufficient with conventional flotation devices, was achieved. Thus, it has become possible to shorten the treatment time for the coagulation / precipitation treatment which previously required a settling time. Therefore, the ratio of the processing amount to the size of the apparatus itself becomes highly efficient, and as a result, there are two effects, that is, cost reduction and environmental conservation for small-scale establishments.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an internal structure of a sewage treatment device and a treated water discharge device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Inner cylinder 2 Stirring drive part 3 Treated water discharger 4 Dirty water inlet 5 Primary pressurized funnel 6 Circulation and air vent hole 7 Impeller 8 Impeller 9 Foam flock forming pipe internal circulation opening 10 Inner cylinder funnel 11 Straightening plate 12 Sewage Spiral plate for raising contaminants 13 Resistor plate 14 Filtration unit 15 Scum storage tank 16 Belt-type scum collection device 17 Recovery container 18 Scum scraping unit 19 Drive shaft 20 Transfer pipe 21 Water intake 22 Filtration unit 23 Drain pipe 24 Outer vessel 25 2 Next pressurized funnel 1M Injector 2M Injector L Water level

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C02F 1/50 550 C02F 1/50 550H 560 560Z 1/52 1/52 Z 1/78 1/78 9/00 502 9 / 00502Z 502D 502R 502P 503 503C 503G 504 504E

Claims (4)

[Claims] An upright cylinder or an upright polygonal cylinder having a sewage inlet at a lower side or a bottom side, an outlet for treated water at an upper or upper opening of the side of the cylinder, and an outlet for an object to be separated. An outer container provided with an air or water injection port at the bottom, and a plurality of funnels as water pressurizing portions, which are of the same cylindrical shape as the container and have a conical or polygonal pyramid shape therein, and further include a lower portion of the cylinder. An impeller in consideration of a plurality of discharge circulation performance surfaces for the purpose of water evacuating and depressurizing and agitation is provided inside the cylinder as a sewage circulation purpose portion where a double structure having the same shape is configured, In addition to the filtration part with magnetism and the impeller driving part on the upper part of the cylinder, the screw-shaped screw-shaped outer peripheral surface is in close contact with the inner wall of the outer container. The spiral plate for the purpose of raising sewage polluted water has a resistance plate for agitation and flow rate adjustment on the horizontal surface, and a plurality of holes or openings for the purpose of water pressure and circulation inside the spiral plate horizontal surface. A sewage treatment apparatus in which a sewage / contaminant raising spiral plate is mounted on the outside and an inner cylinder is attached. 2. Consideration is given to the reaction promotion and reaction residence time of various sewage treatment flocculants due to a change in flow velocity caused by gradually increasing the pitch of the sewage rise spiral plate described in claim 1. A sewage treatment device characterized by the following. 3. A treated water discharge device which is connected to the sewage treatment device described in claim 1 and has a filtration portion having both a water level adjusting mechanism and a magnetism and an air or water injection port therein. 4. An ozone generator is interlocked with an ozone generator in a stage prior to the air or water injection port as described in claim 1 and 3, and ozone is mixed and injected into air or water to sterilize the target water for treatment. A sewage treatment device characterized by considering decolorization.