JPH03114594A - Apparatus for treating effluent water - Google Patents

Abstract

PURPOSE:To smoothly perform treatment reaction by effectively utilizing the whole of the interior of a reaction tank and improving the contact with anaerobic bacteria by a method wherein the interior of the reaction tank is partitioned into a plurality of beds and Venturi tube like connection pipes are formed to the respective beds and barrier plates are arranged above the respective connection pipes. CONSTITUTION:Effluent water (a) to be treated is introduced into a reaction tank 1 at low flow velocity from a effluent water inflow port 9. The flow velocity of the effluent water increases when the effluent water passes through connection pipes 2-1 to 2-4 and the effluent water (a) is sprayed to barrier plates 3-1 to 3-4 by the force thereof and turblent flow is generated in respective beds T1-T4 and the contact with anaerobic bacteria becomes well. As a result, treatment reaction is smoothly performed. At the same time, the sedimentation of the suspended components in the effluent water is accurately advanced. As the treatment advanced, water is discharged from a treated water discharge port 6 as treated water (d) and the suspended components are withdrawn from a drain 10 as sludge (b). The generated gas C is collected by a gas collection pipe 4 and gas collection ports 8-1 to 8-3 and guided to gas piping 7 to be stored in the storage part outside the tank.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a wastewater treatment device used for sewage treatment and the like.

B. Summary of the Invention The present invention provides a wastewater treatment device for treating sewage, etc. by an anaerobic treatment method, in which the inside of a reaction tank is divided into multiple layers, a venturi-like connecting pipe is formed at the bottom of each layer, and the bottom layer is By creating a single flow path from the wastewater inlet connected to the connecting pipe to the treated water outlet on the top layer, and by placing baffles above each connecting pipe to create turbulent flow, the reaction tank The entire interior is used effectively and the wastewater to be treated is brought into good contact with anaerobic microorganisms, thereby facilitating the treatment reaction.

C0 Conventional technology In recent years, anaerobic treatment methods have become popular not only for high-concentration organic wastewater but also for low-concentration organic wastewater such as sewage, as they do not require aeration and generate little surplus sludge. The scope of its application is about to expand, and much research is being actively conducted.

When treating sewage anaerobically, it is impossible to heat the reaction tank to a temperature of around 35°C, which is the optimal temperature condition for anaerobic treatment, using only the methane generated during treatment due to the low concentration of organic matter. anaerobic fixed bed, anaerobic fluidized bed, anaerobic sludge. By adopting a floor or the like and maintaining a high concentration of anaerobic microorganisms in the reaction tank, it has become possible to treat sewage even with a relatively short hydraulic retention time (HRT).

D Problems to be Solved by the Invention However, simply adopting an anaerobic fixed bed, etc. does not effectively utilize the entire interior of the reaction tank. It is desired to develop a device that can make effective use of the entire inside of the tank, such as by ensuring good contact and installing several inlets to prevent short-circuit flow so that the wastewater flows in evenly.

An object of the present invention is to provide a wastewater treatment device that can effectively utilize the entire inside of a reaction tank.

Means for Solving the E0 Problem The present invention provides a reaction tank whose interior is divided into multiple layers, a plurality of connecting pipes formed in the shape of a Venturi tube at the bottom of each layer of this reaction tank, and a connecting pipe in the lowest layer. A waste water inlet and a drain arranged so as to be connected to each other, a treated water outlet provided at the upper side of the uppermost layer, a plurality of baffles for generating turbulent flow arranged above each of the connecting pipes, A gas collection pipe installed on the top layer of the reaction tank, a gas collection port provided on the upper side of the layer other than the top layer, and a gas collection port connected to the gas collection pipe and collection port to collect the gas. The device is characterized in that it includes a gas pipe that guides the generated gas to the storage section.

The present invention also provides a reaction tank whose interior is divided into multiple layers, a plurality of connecting pipes formed in the shape of a Venturi tube at the bottom of each layer of the reaction tank, and a plurality of connecting pipes arranged to be individually connected to each of these connecting pipes. a plurality of waste water inlets and drains, a treated water outlet provided on the upper side of the top layer, a plurality of baffles for generating turbulent flow arranged above each of the connecting pipes, and a plurality of baffles for generating turbulence arranged above each of the connecting pipes; A gas collection pipe installed on the top layer,
A gas collection port provided at the upper side of the layer other than the top layer;
A gas pipe that is connected to the gas collection pipe and the collection port and leads the collected generated gas to the storage part, a circulation pipe that connects each of the drains, and a part of the drawn sludge that is inserted into the circulation pipe. The sludge is characterized by being equipped with a circulation pump that returns the sludge as seed sludge.

F3 action The wastewater to be treated is introduced into the reaction tank at a small flow rate. The flow velocity of wastewater increases as it passes through the connecting pipe, and when the wastewater is blown against the baffle plate by this force, turbulent flow occurs in each layer, improving contact with anaerobic microorganisms. As a result, the processing reaction is carried out smoothly. At the same time, the sedimentation of SS (suspended solids) components in the wastewater progresses appropriately. As the treatment progresses, water is discharged as treated water from the treated water outlet in the top layer, and the water is discharged as treated water from the SS.
The components are extracted from the drain as sludge. The generated gas is collected in a gas collection pipe and a collection port, guided to a gas pipe to the gun, and stored in a storage section outside the tank.

Furthermore, when wastewater is co-supplied, the treatment reaction is accelerated. In this case, if the sludge is returned, the amount of microorganisms becomes high in concentration, treatment efficiency increases, and the stirring effect improves.

G. Examples Hereinafter, the present invention will be explained in detail based on examples shown in the drawings.

FIG. 1 shows an embodiment of the present invention, in which a reaction tank I
The interior is divided into multiple layers, for example, four layers T1 to T4, and connecting pipes 2-1 to 24 are formed at the center of the bottom of each layer. Connecting pipes 2-1 to 2-4 have narrow pipe diameters like venturi pipes, and baffle plates 3-f to 3-4 are arranged above each layer to spray wastewater and create turbulent flow. are doing.

A gas collection pipe 4 is disposed in the uppermost layer T4 of the reaction tank 1, and a treated water collection gutter 5 is disposed at the upper part of the inner surface, and a treated water outlet 6 is provided in this gutter. The gas collection pipe 4 is connected to a gas pipe 7 outside the tank l. Furthermore, gas collection ports 8-1 to 8-3 are provided at the upper part of the inner surface of the other layer TI-T3, and these are connected to the gas pipe 7. The collected gas is stored.

On the other hand, the connecting pipe 2-1 of the lowermost layer TI of the reaction tank I is provided with a waste water inlet 9 and a drain IO, and valves 11 and 12 are attached to these.

During wastewater treatment, wastewater & is introduced into the tank l from the wastewater inlet 9. At this time, the flow rate of the waste water a is made small. The flow velocity of the wastewater λ increases when it passes through the connecting pipes 2-1 to 2-4, and the momentum causes it to be blown onto the baffle plates 31 to 3-4.

Therefore, turbulent flow occurs in each layer TI-T4, which improves contact with anaerobic microorganisms in the tank. After being treated in each layer and reaching the top layer T4, it enters the treated water collection trough 5 and the discharge port 6.
is discharged as treated water d.

On the other hand, when the waste water passes through each layer in the reaction tank 1 at a small flow rate, the SS (suspended solids) in the waste water easily settles and flows from the drain 10 connected to the connecting pipe 2-1 of the lowest layer TI. It is extracted and discharged as sludge.

In addition, the gas (methane gas scent) generated during the treatment process is
- In T3, the gas is collected from the gas collection ports 8-1 to 8-3, flows through the gas pipe 7 together with the gas collected in the gas collection pipe 4 in the uppermost layer T4, and is stored as generated gas C outside the tank. be done.

FIG. 2 shows another embodiment of the present invention, in which the interior of the reaction tank 1 is divided into 11 to 14 layers as in the previous embodiment.
Although the connecting pipes 2-1 to 2-4 are formed to form one flow path, in this embodiment, wastewater and sludge can be directly supplied to the T2 to T4 layers other than the lowest layer TI.

That is, the drain inlets 9-1 to 9-4 and the drains 10-1 to 10-4 are connected to the connecting pipes 2-1 to 2-4 of the TI-T4 layer.
10-4 is provided, and the drainage inlets 91 to 9-4 are valve ll.
The drains 10-1 to 10-4 connect the valves 12-1 to I2-4 to the sludge circulation pipe 14, respectively, through -1-11-4 to the common waste water supply pipe 13. A circulation pump 15 and a valve 16 are inserted into the sludge circulation pipe 14 in order to supply a portion of the drawn sludge as circulation sludge e to the T2 to T4 layers.

With such a configuration, waste water & is fed to the upper T2 to T4 layers, thereby promoting the treatment reaction.

In this case as well, turbulent flow occurs in each layer, allowing the anaerobic microorganisms in the tank to make good contact with the waste water without settling.

According to the present invention, the interior of the reaction tank is divided into a plurality of layers, and a Venturi-shaped connecting pipe is formed in each layer to communicate with each other, so that wastewater flows at a small flow rate. Therefore, the entire interior of the reaction tank can be used effectively. In addition, it is possible to enhance the ability to remove SS components from wastewater and prevent short circuit currents. Additionally, baffle plates were placed above each connecting pipe to create turbulent flow.
With a simple structure, it is possible to stir the inside of the tank, which improves contact with anaerobic microorganisms and facilitates treatment reactions. Furthermore, by directly supplying wastewater to areas other than the lowest layer, and by returning a portion of the extracted sludge as seed sludge, treatment efficiency can be increased by increasing the concentration of microorganisms, and by adjusting the sludge return flow rate. Further improvement of the stirring effect can be expected.

[Brief explanation of drawings]

FIG. 1 is a structural explanatory diagram showing one embodiment of a wastewater treatment apparatus according to the present invention, and FIG. 2 is a structural explanatory diagram showing another embodiment of the present invention. 1... Reaction tank, 2-1 to 2-4... Connecting pipe, 3
-I~3-4... Baffle plate, 4... Gas collection tube, 5.
... Treated water collector, 6... Treated water outlet, 7... Gas piping, 8-1 to 8-3... Gas collection port, 9.9-1
~94...Drainage inlet, 10.10-1~10-4.
...Drain, 11.11-1 to 11-4.12.12
-1 to 12-4.16...Valve, 15...Circulation pump. 1...Reaction tanks 2-1 to 2-4...Connecting pipes 3-1 to 3-4 -Baffle plate 4...Gas collection pipe 5...Treated water collector 6...Treated water outlet a ... Gas piping 8-1 to 8-3 ... Gas collection port 9 ... Non-water inlet 10 ... Drain 1112 - Valve a - Drainage b - Pulled sludge C - Generated gas d - Treated water No. 1 Figure so U

Claims (2)

[Claims] (1) A reaction tank whose interior is divided into multiple layers, a plurality of connecting pipes formed in the shape of a Venturi tube at the bottom of each layer of this reaction tank, and a drainage stream arranged to connect to the connecting pipes in the lowest layer. an inlet and a drain, a treated water outlet provided at the upper side of the top layer, a plurality of baffles for generating turbulence placed above each of the connecting pipes, and a plurality of baffles installed in the top layer of the reaction tank. A gas collection pipe, a gas collection port provided on the upper side of the layer other than the top layer, and a gas pipe connected to the gas collection pipe and collection port to guide the collected generated gas to the storage section. A wastewater treatment device characterized by comprising: (2) A reaction tank whose interior is divided into multiple layers, a plurality of connecting pipes formed in the shape of a Venturi tube at the bottom of each layer of this reaction tank, and a plurality of connecting pipes arranged to be individually connected to each of these connecting pipes. a waste water inlet and a drain, a treated water outlet provided on the upper side of the top layer, a plurality of baffles for generating turbulence placed above each of the connecting pipes, and a drain in the top layer of the reaction tank. The installed gas collection pipe, the gas collection port provided on the upper side of the layer other than the top layer, and the gas collection pipe and collection port are connected to each other, and the collected generated gas is transferred to the storage section. a gas pipe to guide the gas, and a circulation pipe connecting each of the drains;
A wastewater treatment device characterized by comprising a circulation pump inserted into the circulation pipe and returning a portion of the drawn sludge as seed sludge.