JPH10487A - Apparatus for producing activated sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the abrasion of a microorganism cultivating agent to be minimum by connecting a culture tank for contacting a microorganism cultivating agent with liquid to be cultivated under aerobic conditions with a circulating flow generator installed outside the culture tank by a transfer pipe and generating the circulating flow of the liquid in the culture tank forcibly. SOLUTION: A cylinder 4 filled with a microorganism cultivating agent 5 to eliminate the gap of an inner surface is installed in the cylindrical main body 3 of a culture tank 1, the upper and lower parts of the cylinder 4 are opened, a roof 6 consisting of gauze, etc., and a bottom plate 7 are installed in the upper and lower end parts, and the agent 5 is placed in the cylinder 4. Besides, a supply port 8 for liquid to be cultivated and a discharge opening 9 for overflow are formed in the upper part of the main body 3, and a discharge opening for cultivated active sludge and a discharge valve 11 are installed on the lower part side of the main body 3. Moreover, installation openings 14, 15 for connecting a circulating flow generator 2 installed outside the tank 1 are formed on the sides of the main body 3 which are positioned above and below the cylinder 4, and the circulating flow is generated forcibly in the tank 1 by the generator 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for producing activated sludge used in treating organic wastewater such as household wastewater, livestock wastewater, fishery, agricultural processing wastewater and the like.

[0002]

2. Description of the Related Art Conventionally, activated sludge method, contact aeration method, sprinkling filter method and the like have been adopted as a method for treating the above-mentioned various wastewaters.
The treatment step includes a reaction step and a precipitation step, and the treatment method is roughly classified according to the type of the reaction step.

Among them, in the activated sludge method which is widely used, the activated sludge generated in the reaction step is separated into a supernatant part and a sludge part in a precipitation step, and the supernatant part becomes effluent water, and the sludge part is discharged. Part of the sludge is returned to the reaction step and used again to adjust the concentration of the activated sludge to a constant level, and the rest is concentrated and carried out of the treatment system.

[0004] However, such a wastewater treatment method has problems such as generation of offensive odor due to hydrogen sulfide and the like, increase of generated sludge, and generation of offensive odor from the sludge. Therefore, in order to solve these problems, a method has been developed in which humus soil or the like is used as a microbial culture medium to activate sludge generated in the treatment step, to produce activated sludge, and to return the sludge to the reaction step. An example of the activated sludge production apparatus is Japanese Patent Publication 5
No. -10999.

[0005] The seed sludge generator (active sludge generator) disclosed in this publication makes a mixed contact between sludge as a liquid to be cultured and a microbial metabolic circuit inducer as a microbial cultivating agent, thereby converting the seed sludge. It is manufactured. In other words, this device fills the inside of the inner cylinder, which is spaced from the outer housing with an inlet and an outlet, with the microorganism culture agent for efficient contact between the microorganism culture agent and the culture medium. Then, aeration is performed from below by a diffuser tube to generate an upflow, which is lowered from the gap and circulated.

[0006]

However, in the apparatus disclosed in Japanese Patent Publication No. Hei 5-10999, since the aeration is generally performed directly from below the microbial culture medium having a pellet-like structure, an inner cylinder is required. There has been a problem that the culture medium repeatedly falls over due to aeration in the body, and the culture medium is severely worn, and the replenishment and replacement work increases, resulting in a high running cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and an object of the present invention is to effectively bring a microorganism culture agent into contact with a culture medium and to reduce the consumption of the microorganism culture agent. It is an object of the present invention to provide an activated sludge manufacturing apparatus capable of minimizing material costs and labor costs associated with replenishment and replacement thereof, thereby reducing running costs.

[0008]

According to the present invention, an object of the present invention is to provide a culturing tank containing a microorganism culturing agent and bringing the microorganism culturing agent into contact with the culture solution under aerobic conditions, A solution is provided by an activated sludge manufacturing apparatus characterized in that a circulating flow generating device provided outside the tank is connected by a transfer pipe to forcibly generate a circulating flow of a liquid to be cultured in a culture tank. Is done.

The activated sludge used in the present invention is not a sludge having a high concentration of microorganisms used in the activated sludge method, but a culture solution or a useful bacterium in which the concentration of microorganisms in the liquid to be cultured is increased by the action of a microorganism culturing agent. Culture medium, and a culture solution in which the microorganism whose metabolic cycle has been converted is cultured. The culture solution used in the present invention is sludge generated by organic wastewater treatment.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings, but it is needless to say that the present invention is not limited to only the embodiments.

FIG. 1 is a longitudinal sectional view showing an embodiment of the apparatus of the present invention, which comprises a culture tank 1 and a circulating flow generator 2.

Reference numeral 3 denotes a cylindrical main body (hereinafter referred to as a main body) of the culture tank 1. Reference numeral 4 denotes a cylindrical body which is disposed inside the main body 3 so as to have no gap with the inner surface thereof and is filled with the microorganism culture agent 5. It is. The upper and lower ends of the cylindrical body 4 are open, and a top plate 6 and a bottom plate 7 made of wire mesh or punched metal are attached to the upper and lower ends thereof.
It works to store it inside. The top plate 6 is detachably attached, and has a structure in which the microorganism culture agent 5 can be charged or replaced.

Microorganism culture agent 5 filled in cylindrical body 4
Is a substance containing an effective component for producing activated sludge, specifically, a useful microorganism culture agent in the form of pellets,
Suitable substances include far-infrared ceramics, rocks, minerals, humus-containing substances, substances having an antibacterial effect on microorganisms other than useful bacteria, or mixtures of these substances. In addition, a supply port 8 for pumping and inflowing the liquid to be cultured by a pump or the like and an outlet 9 for overflowing the liquid to be cultured are provided in the upper part of the main body 3. A sludge discharge port 10 and a discharge valve 11 are provided.

An outlet 12 for removing dust and the like contained in the culture solution from the inside of the main body 3 is provided at the bottom of the main body 3.
A discharge valve 13 is provided. In addition, attachment ports 14 and 15 are provided on the side surfaces of the main body 3 located above and below the cylindrical body 4 for connecting a circulating flow generator 2 described later provided outside the culture tank 1.

Reference numeral 16 denotes a water level sensor capable of regulating the inflow amount of the liquid to be cultured and the removal amount of the activated sludge. The water level sensor detects a predetermined water level and controls the pump,
It controls valves and the like. Reference numeral 17 denotes a guide tube which directly introduces the culture solution flowing from the supply port 8 into the lower side of the cylindrical body 4.

On the other hand, the circulating flow generator 2 is a device for forcibly generating a circulating flow in the culture tank 1, and includes an air lift pump 18 and a connecting pipe 19 serving as a transfer pipe thereof. The air lift pump 18 is connected to two connection ports 14 and 15 of the main body 3 via connection pipes 19, and generates a circulating flow as indicated by an arrow in FIG. 1 by operating the air lift pump 18. The direction of the circulating flow may be opposite to the direction of the arrow, and can be appropriately selected depending on the structure of the device. In this case, since aeration is performed simultaneously by the air lift pump 18, there is no need to provide a separate aeration device.

The operation of this embodiment will be described below. The liquid to be cultured introduced from the supply port 8 using a pump or the like is filled from the lower portion of the cylindrical body 4 in the main body 3 by the introduction port 17, and the flooding amount is adjusted by the control circuit of the water level sensor 16. When a large amount of dust or the like is contained in the culture solution, the waste is settled and discharged through the discharge port 12 by opening the discharge valve 13 to remove the dust and the like.
Next, the air lift pump 18 of the circulating flow generator 2 is started to generate a circulating flow. As a result, a water flow in a certain direction is generated between the culture tank 1 and the circulating flow generator 2 as shown by an arrow in FIG. 1, and the liquid to be cultured comes into contact with the microorganism culture agent 5 filled in the inner cylinder 4. It is circulated while.

At this time, since the microorganism culturing agent 5 is arranged without a gap with the inner surface of the main body 2, the liquid to be cultured always comes into contact with the microorganism culturing agent 5. The time for circulating, that is, the time for culturing, should be 24 hours or more,
There is no particular limitation. After the cultivation, the produced activated sludge is returned to the later-described reaction step via the discharge port 10 by opening the discharge valve 11.

When the activated sludge is discharged and returned to a predetermined water level, the control circuit of the water level sensor 16 closes the take-out valve 11. At this time, the amount of the culture solution to be returned is approximately half of the total volume, but is not particularly limited. In this state, the remaining half of the activated sludge remains in the culture tank 1, and the culture liquid is newly supplied from the supply port 8 to the main body 3.
And the above operation is repeated. The reason for leaving about half of the activated sludge is to improve the production efficiency of the activated sludge.

FIG. 2 is a longitudinal sectional view showing another embodiment. The difference from FIG. 1 is that a water flow pump 20 is used in place of the air lift pump 18 of the circulating flow generator 2, and an air supply pipe 21 is connected to a connection pipe 19 for aeration. It is. The installation position of the air supply pipe 21 may be any position above the inner cylinder 4 or an appropriate position of the connection pipe 19.

FIG. 3 is a schematic diagram when the present invention is used in a wastewater treatment facility. The organic wastewater that has flowed into the wastewater treatment facility undergoes a reaction process that removes refuse and the like using screens and sedimentation basins, and a purification process that uses microorganisms.These processes are finally separated into supernatant and sludge in the precipitation process. The supernatant is discharged to rivers and the like as treated water.
On the other hand, the sludge is concentrated in the concentration step, and a part of the sludge is taken out into the apparatus of the present invention, activated by the microorganism culture agent, and the produced activated sludge is returned to each treatment tank in the reaction step. As a result, the concentration of the activated sludge produced by the present apparatus contained in the treatment tank is increased, and the treatment efficiency is enhanced.

[0022]

As described above, when the activated sludge generator of the present invention is used, reliable contact between the liquid to be cultured and the microorganism culturing agent is performed, and at the same time, the wear of the microorganism culturing agent is minimized. Can be. Therefore, the present invention is extremely practical because the material cost and labor cost associated with the replenishment and replacement can be minimized, and the running cost can be reduced as a result.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an apparatus for producing activated sludge, showing one embodiment of the apparatus of the present invention.

FIG. 2 is a longitudinal sectional view of an apparatus for producing activated sludge showing another embodiment of the apparatus of the present invention.

FIG. 3 is a schematic diagram when the device of the present invention is used in a wastewater treatment facility.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Culture tank 2 ... Circulation flow generator 3 ... Cylindrical body 4 ... Cylindrical body 5 ... Microorganism culture agent 6 ... Top plate 7 ... Bottom plate 8 ... Supply port 9 ... Overflow discharge port 10 ... Removal port 11 ... Removal valve 12 ... Discharge port 13 ... Discharge valve 14 ... Mounting port 15 ... Mounting port 16 ... Water level sensor 17 ... Guide pipe 18 ... Air lift pump 19 ... Connection pipe 20 ... Water flow pump 21 ... Air supply pipe

Claims (4)

[Claims] 1. A culture tank containing a microorganism culturing agent, and bringing the microorganism culturing agent into contact with a culture solution under aerobic conditions;
An activated sludge manufacturing apparatus, wherein a circulating flow generator provided outside a culture tank is connected by a transfer pipe to forcibly generate a circulating flow of a liquid to be cultured in the culture tank. 2. The microorganism culturing agent is a useful microorganism culturing agent in the form of a pellet, a substance containing far-infrared ceramics, rocks, minerals, humus, a substance having an antibacterial effect on microorganisms other than useful bacteria, or a mixture of these substances. Claim 1.
4. The activated sludge production apparatus according to claim 1. 3. The activated sludge production apparatus according to claim 1, wherein the circulating flow generator is an air lift pump. 4. The activated sludge producing apparatus according to claim 1, wherein the circulating flow generator comprises a water pump and an air supply pipe.