KR100438099B1 - Biological Sewage/Wastewater Treatment Methodology By Using Soil Microoganisms - Google Patents

Abstract

The present invention relates to a biological treatment method of wastewater using soil microorganisms, comprising: a solid separation step of separating influent miscellaneous materials using a solids separator;

An activation step of activating the organic sludge in the activation tank;

An anaerobic treatment step of treating the waste water using activated sludge and anaerobic microorganisms while stirring the waste water at a low speed in the anaerobic tank;

A first partial aerobic treatment step of repeating a process of supplying and stopping air by using an aeration apparatus in the partial aeration tank and treating wastewater using sludge and anaerobic aerobic microorganisms;

A second partial aerobic treatment step of repeating a process of supplying and stopping air by using an aeration apparatus in a secondary partial aeration tank, and treating wastewater using sludge and anaerobic aerobic microorganisms;

This is achieved by discharging the purified wastewater from the primary secondary settling tank and using a sludge pump to supply some sludge to the activation tank and discharge the remainder.

Description

Biological Sewage / Wastewater Treatment Methodology By Using Soil Microoganisms}

The present invention relates to a biological treatment method of wastewater using soil microorganisms, and in particular, industrial wastewater containing a large amount of nitrogen and phosphorus, domestic wastewater, livestock wastewater and polluted lakes using microorganisms in purifying contaminated water. It is invented to effectively improve the BOD, COD and SS and the like, in particular to efficiently remove nitrogen and phosphorous.

In general, when wastewater such as domestic sewage, livestock wastewater, phosphorus classification, industrial wastewater, etc. flows into a river or lake, the pollution is intensified. In order to prevent the stream or lake from being contaminated by the waste water, the influent wastewater should be purified.

It is well known in the art that in the general wastewater purification, suitable anaerobic and aerobic microorganisms can be used together to purify contaminants contained in the wastewater.

In general, the decomposition process using anaerobic microorganisms refers to a process in which organic matters of contaminants are converted to carbon dioxide and methane by microorganisms in an oxygen-free environment.

Part of the organic matter is decomposed through the anaerobic treatment process, and then oxidized through the aerobic treatment process using the aerobic microorganism to completely decompose the pollutants.

By repeating this process once or several times, contaminants (particularly organic matter) contained in the waste water can be removed.

In particular, since nitrogen (N) and phosphorus (P) contained in the waste water cause eutrophication or green algae of streams and lakes, efforts to remove them continue to this day.

In order to purify livestock wastewater, industrial wastewater and domestic wastewater containing a large amount of nitrogen and phosphorus, a method for effectively removing nitrogen and phosphorus is urgently needed.

Conventionally, attempts have been made to remove nitrogen and phosphorus using chemical methods, but chemical treatment methods cause secondary pollution and require enormous costs, and in recent years, many biological treatment methods using microorganisms have been made. to be.

However, existing methods such as catalytic oxidation and sewage treatment have some effects in terms of improvement of BOD, COD, etc., but have not removed nitrogen and phosphorus to a satisfactory level.

An object of the present invention is to provide a biological treatment method of wastewater using soil microorganisms that can maximize the treatment efficiency.

Another object of the present invention is to provide a biological treatment method for wastewater using soil microorganisms which can provide economic benefits by reducing construction costs and operating costs for treatment.

1 is a simplified block diagram illustrating the method of the present invention.

The object of the present invention, the solid matter separation step of separating the influent water by using a solid separator;

An activation step of activating the organic sludge in the activation tank;

An anaerobic treatment step of treating the waste water using activated sludge and anaerobic microorganisms while stirring the waste water at a low speed in the anaerobic tank;

A first partial aerobic treatment step of repeating a process of supplying and stopping air by using an aeration apparatus in the partial aeration tank and treating wastewater using sludge and anaerobic aerobic microorganisms;

A second partial aerobic treatment step of repeating a process of supplying and stopping air by using an aeration apparatus in a secondary partial aeration tank and treating wastewater using sludge and anaerobic aerobic microorganisms;

This is achieved by discharging the purified wastewater from the primary secondary settling tank and using a sludge pump to supply some sludge to the activation tank and discharge the remainder.

Therefore, by culturing the microorganisms used in the anaerobic and partial aerobic treatment step, it is possible to improve the wastewater treatment capacity by anaerobic and aerobic microorganisms, and also to decompose contaminated organic matter contained in the organic sludge.

In addition, odor can be removed by removing ammonia nitrogen.

And, by adjusting the height of the treatment tank for each step it is possible to move the waste water of the treatment process it is possible to reduce the cost by eliminating the need for a mobile device for moving the waste water and the operation of the mobile device.

Hereinafter, the preferred embodiment of the present invention will be described in detail.

The solids separating step is to separate various miscellaneous substances contained in the incoming wastewater by using a solids separating apparatus. The miscellaneous substances separated in this process may be mixed with straw and used as organic fertilizer.

The anaerobic treatment step is a step of culturing microorganisms with about 40% of the activated sludge pond filled with organic sludge, which is used in the present treatment method using organic sludge collected from the primary and secondary sedimentation tanks. The major microorganisms will be cultured.

The organic sludge provides abundant food for the microorganisms, and when the microorganism reaches the organic sludge in the wastewater, it penetrates into the sludge and absorbs and decomposes a large amount of organic matter contained therein to grow. This process takes place in the sludge activation step of the treatment method.

It was found that maintaining the sludge amount in the sludge activator tank about 40% of the activator tank creates an optimal environment in which microorganisms can be cultured.

And, the size of the sludge activation tank is about 0.15 to 0.2 times the daily wastewater inflow.

Anaerobic treatment step is carried out in the anaerobic pond (Anaerobic Pond), is a step of treating the wastewater introduced under anaerobic conditions using the sludge and anaerobic microorganisms activated in the sludge activation step above.

In anaerobic tanks, the process takes place without any air injection (including artificial air injection).

The sludge amount in the anaerobic tank maintains about 40% of the anaerobic tank to create the optimum environment for microorganisms to work.

The residence time of the operated water required in the anaerobic treatment stage is usually about 36 hours.

In the anaerobic tank, an agitator is installed to prevent sediment accumulation on the bottom. The stirring speed is set at a low speed of 0.2 to 0.6 rpm.

The size of the anaerobic tank is about 1.5 times the daily inflow.

The microorganisms used in the anaerobic treatment step are not limited to specific microorganisms, and any anaerobic microorganisms that can be used for wastewater treatment under anaerobic conditions may be used.

In the method of the present invention, using a natural soil microbial complex is more effective.

The first partial aerobic treatment step is performed in a partial aerobic pond by treating the wastewater having undergone the above anaerobic treatment step through a partial aerobic process using activated sludge and aerobic anaerobic microorganisms.

This is where the main biological reaction takes place. The partial aerobic process is a repetitive process of supplying and stopping air for a period of time using an aeration pump, alternating between aerobic and anaerobic microorganisms in the same treatment tank. Create an environment in which to act. This process can significantly lower COD levels.

At this time, the air supply through the aeration device is repeated in a manner of supplying 15 minutes and interrupted 30 minutes, the air supply amount is about 0.5 ~ 0.8 ㎥ in 1 minute and the air is uniformly supplied in the water. It should be noted that excessive air supply creates bubbles and decreases the efficiency of aerobic reactions.

The sludge amount in the partial aeration tank maintains about 40% of the partial aeration tank, thus creating an optimal environment in which microorganisms can operate.

The residence time of the ape water required in the partial aerobic treatment step is preferably about 16 hours.

In addition, the size of the partial aeration tank is about 0.7 times the daily wastewater inflow.

The secondary partial aerobic treatment step is a step of treating wastewater that has undergone the anaerobic treatment step using sludge and aerobic anaerobic microorganisms activated under partial aerobic conditions as in the first partial aerobic treatment step. ^nd Partical Aerobic Pond).

Like the first partial aerobic treatment step, an aeration pump is used to supply and stop air for a certain period of time, creating an environment in which aerobic and anaerobic microorganisms can alternate in the same treatment tank. This process further lowers the COD levels.

At this time, the air supply through the air supply device is repeated in a manner of supplying 30 minutes and 15 minutes interruption, the air supply amount is about 0.5 ~ 0.8 ㎥ in 1 minute and the air is uniformly supplied in the water. It should be noted that excessive air supply creates bubbles and decreases the efficiency of aerobic reactions.

The amount of sludge in the secondary partial aeration tank maintains about 40% of the secondary partial aeration tank, creating an optimal environment for microorganisms to work.

The residence time of the waste water required in the second partial aerobic treatment stage is about 16 hours.

The size of the secondary partial aeration tank is about 0.7 times the daily wastewater inflow.

The sedimented and purified wastewater discharge step is carried out in a sediment pond, where a sludge pump is used to transfer some sludge from the primary and secondary sedimentation tanks to the active tank and discharge the remaining sludge. The sludge transferred to the activator is used to culture and grow the major microorganisms used for wastewater treatment.

The size of the sedimentation tank is about 0.2 times the daily wastewater inflow.

Here, the solid water separation equipment (Solid / Liquid Separation Equipment) and the air supply device can be used to shorten the wastewater treatment period, and according to the degree of pollution of the wastewater and major pollutants, By adjusting the size, the processing efficiency can be increased.

In addition, the method of the present invention further comprises the steps of sedimentation, filtration (eg, using a sand filter, natural ceramic filter, etc.) and / or sterilization (eg, UV sterilization) on the wastewater discharged after all the above steps. To provide.

In this way, the waste water can be purified more cleanly.

According to the sludge activation step of the present invention as described above, the organic sludge provides abundant food to the microorganism, when the microorganism reaches the organic sludge in the waste water, it grows while absorbing and decomposing a large amount of organic matter contained therein. .

Through the sludge activation step, by culturing the microorganisms used in the anaerobic and partial aerobic process treatment step, it is possible to improve the wastewater treatment capacity by anaerobic and aerobic microorganisms and at the same time decompose contaminated organic matter contained in the organic sludge. In addition, the odor can be removed by removing the ammonia nitrogen.

In addition, it is possible to move the waste water of the treatment process by adjusting the height of each treatment tank.

By doing so, it is a very useful invention such as reducing the cost by eliminating the need for a moving device for moving the waste water and the operation of the moving device.

Claims (4)

A solid separation step of separating the miscellaneous substances of the influent using a solid separator; An activation step of activating the organic sludge in the activation tank; An anaerobic treatment step of treating the waste water using activated sludge and anaerobic microorganisms while stirring the waste water at a low speed in the anaerobic tank; A first partial aerobic treatment step of repeating a process of supplying and stopping air by using an aeration apparatus in the partial aeration tank and treating wastewater using sludge and anaerobic aerobic microorganisms; A second partial aerobic treatment step of repeating a process of supplying and stopping air by using an aeration apparatus in a secondary partial aeration tank, and treating wastewater using sludge and anaerobic aerobic microorganisms; A method for biological treatment of wastewater using soil microorganisms, comprising: treating the wastewater purified from the primary secondary sedimentation tank; and supplying some sludge to the activation tank using a sludge pump and releasing the rest. The method according to claim 1, wherein the amount of sludge in the active tank, anaerobic tank, partial aeration tank and secondary aeration tank is maintained at 40%, and stirred at 0.4 to 0.6 rpm to prevent deposits on the bottom in the anaerobic tank of the anaerobic treatment step. Biological treatment method of wastewater using the soil microorganism characterized in that. The method of claim 1, wherein the partial aeration tank of the first partial aerobic treatment step is supplied with air about 0.5 to 0.8 ㎥ in 1 minute for 15 minutes using an aeration pump and the process is stopped for 30 minutes, and the 2 In the secondary partial aeration tank of the secondary partial aerobic treatment stage, the soil microorganism is characterized by repeating the process of supplying air at about 0.5 to 0.8 ㎥ per minute for 30 minutes and stopping for 15 minutes using an aeration pump. Biological treatment method of used wastewater. The method of biologically treating wastewater using soil microorganisms according to claim 1, wherein the sludge pump is supplied from the primary secondary sedimentation tank to the active tank to cultivate major microorganisms necessary for the wastewater purification treatment.