KR20100026643A - Digester for reducing sludge - Google Patents

Abstract

PURPOSE: A digester reducing sludge is provided improve a sludge treatment effect by decomposing raw sludge with an ultrasonic wave before inserting into the digester, and to improve decomposition efficiency by maintaining the inner temperature of the digester suitable for microorganisms. CONSTITUTION: A digester reducing sludge comprises the following: a sludge digesting tank(100) supplied with raw sludge and concentrated sludge in the inside to help microorganisms in the concentrated sludge to ingest the raw sludge; a stirring unit(200) stirring the raw sludge and the concentrated sludge with a stirring wing(240) connected to a motor(220) on the upper side of the sludge digesting tank; a sludge inserting unit(300) installed in one side of the sludge digesting tank to decompose the sludge using ultrasonic waves before inserting into the sludge digesting tank; and a temperature maintaining unit(400) maintaining the temperature in the inside of the tank for the microorganism to live in by supplying steam into the sludge digesting tank.

Description

Digester for reducing sludge {digester for reducing sludge}

The present invention relates to a digester for treating sludge in a sewage treatment plant, and more particularly, to destroy sludge cell walls using ultrasonic waves and to maintain an internal temperature of the digester using an external heat source to improve digestion efficiency. It relates to a digester for weight reduction.

In general, the digester is a tank for decomposing and treating sludge, that is, sludge generated during the treatment of wastewater and wastewater. In general, raw sludge is added to the inside of the tank and concentrated sludge is added to the anaerobic present in the concentrated sludge. The organisms ingest sludge, multiply and simultaneously reductively decompose it.

These digesters are used for wastewater treatment, especially anaerobic digestion. Anaerobic digestion involves the reduction of organic matter in sludge and the release of useless inorganic compounds. There are three stages of alkaline fermenters.

In an acid fermenter, hydrocarbons are mainly decomposed by the action of anoxic bacteria, and in an acid reducer, organic acids and nitrogen compounds are decomposed, and finally, in an alkaline fermenter, most of the remaining organic matter is decomposed to generate carbon dioxide gas or methane gas. It is stabilized.

By the way, looking at the conventional digester there is a problem that the digestion is not made according to the temperature or season in the process of ingesting the sludge microorganisms.

In other words, in order to grow or maintain microorganisms in the sludge, the internal temperature of the tank must be maintained at a constant temperature.

However, especially in winter, the temperature inside the tank is dropped in the cold, the growth rate of the microorganism is sharply lowered, there is a problem that the digestion efficiency is lowered.

The present invention has been made in view of such a conventional problem, and its object is to destroy the molecules of the sludge using ultrasonic waves, and to maintain the temperature inside the digester at a constant temperature regardless of the season, the sludge can improve the digestion efficiency To provide a reduced digester.

It is another object of the present invention to provide a digester for reducing sludge, which has a reaction tank on one side of the digester so that the sludge passes through the reaction tank and is decomposed through ultrasonic waves, thereby facilitating digestion.

Still another object of the present invention is to provide a digester for reducing sludge, by which steam is injected into the digestion tank to maintain the temperature in the tank, thereby improving microbial propagation as well as reductive decomposition efficiency of the sludge. have.

The present invention provides a digestion tank for treating sludge generated during sewage and wastewater treatment in a wastewater treatment plant, comprising: a digestion tank in which fresh sludge and concentrated sludge are introduced to allow the microorganisms of the concentrated sludge to consume the raw sludge; An agitator configured to stir the raw sludge and the concentrated sludge with a stirring blade connected to a motor installed on an upper portion of the digestion tank; An ultrasonic sludge inlet unit installed at one side of the digestion tank and discharging the sludge by supplying ultrasonic waves before the digestion tank is added to the digestion tank; It is achieved by having a technical feature consisting of; a temperature holding unit for supplying steam to the digestion tank to maintain the temperature inside the tank at a temperature in which the microorganisms inhabit.

The present invention can improve the sludge treatment effect by decomposing the raw sludge by ultrasonic irradiation before digestion.

In addition, the present invention is an invention that can improve the decomposition efficiency of the sludge by maintaining the temperature inside the digestion tank of the digester to a temperature suitable for incubation of microorganisms.

In addition, the present invention is an invention that can be used to put the sludge according to the decomposition process of the digester by radially adjusting the temperature control unit and the input unit around the digester, and save energy by using the discharged water discharged after the waste water treatment.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, Figure 1 attached is a system diagram showing an example of a digester according to the present invention, Figure 2 shows an example applied to the digester according to the present invention, Figure 3 shows another embodiment of the present invention.

In the drawing, the digester 10 of the present invention is a tank 100 into which the sludge is introduced, an agitator 200 installed inside the tank, and an inlet 300 to inject the decomposed sludge by irradiating ultrasonic waves to the digestion tank. Consists of, the injection unit 300 is composed of a reaction tank 320 and the ultrasonic generator 340.

In addition, the digester 10 of the present invention is a configuration that the temperature maintaining unit 400 is provided to maintain a constant internal temperature.

The fire extinguishing tank 100 is manufactured and constructed by varying its capacity according to the size of the treatment plant, that is, the wastewater treatment plant in a circular shape, and is equipped with a sludge supply pipe 102 connected to the inlet and a cover at the top thereof.

The stirring unit 200 is a mechanically installed motor 220 is installed on the cover and the stirring blades 240 connected to the motor rotates to stir the sludge.

In other words, the raw sludge generated in the waste water treatment process is introduced into the inner digestion chamber 120 of the digestion tank 100, and the sludge generated in the concentrated sludge is added to the concentrated sludge again. Ingested to be decomposed, but at this time, the stirring unit 200 is configured to mix evenly by stirring them.

The input unit 300 is composed of a reaction tank 320 having a double wall and the ultrasonic generator 340 is installed on the inner wall of the reaction tank.

The reaction tank 320 is a double wall as shown in the figure, a space between the outer wall 324 and the inner wall 322 is configured to allow water, that is, moisture can be adjusted through this space.

In other words, the general sludge has a water content of about 90%. However, too much moisture in the treatment of sludge may be a problem for sludge drying, which is composed of decomposition, treatment and post-treatment.

Therefore, the present invention constitutes a double wall of the input unit 300, the inner wall 322 is composed of a mesh or a porous plate part of the water contained in the sludge introduced into the inner through the lower drain pipe 306 The water is allowed to escape and the water can be sent to the digester according to the water content in the digester.

The ultrasonic wave generator 340 is configured to repeatedly compress and expand the ultrasonic wave between 16 kV and 10 kV to the sludge, and the plurality of ultrasonic generators 340 penetrate the inner wall 322 to be installed above and below. .

In the figure, reference numeral 302 denotes a sludge inlet pipe, and 304 denotes a sludge discharge pipe 304, which is connected to the sludge supply pipe 102.

The temperature maintaining part 400 has a spray pipe 420 for injecting heated steam while passing through the heat exchange part 440, and the water supplied to the heat exchange part uses final discharged water.

In other words, the effluent after the wastewater treatment process passes through each process and maintains a temperature of approximately 40 ° C. This is because they pass through the wastewater treatment plant, in particular the digester, and are heated through the temperature of the heated water and the underground buried concentrator.

Therefore, the present invention can save energy by using effluent water having a temperature of at least 40 ℃. Of course, the heat exchanger may be a boiler or other form.

The present invention having such a configuration begins with crushing sludge using ultrasonic waves.

The sludge generated in the waste water treatment process is supplied into the reaction tank 320 through the inlet pipe 302. At this time, the sludge inflow pipe 302 is connected to the inner wall 322 to supply sludge to the sludge, the water of the supplied sludge is part of the outer side of the inner wall made of a porous plate or mesh, that is, part plunged into The water content is adjusted out.

In this state, when the ultrasonic generator 340 having a plurality of upper and lower sides of the inner wall is operated, the ultrasonic generator 340 irradiates the sludge with an ultrasonic wave having a vibration frequency of 16 Hz to 10 Hz, and the ultrasonic waves are longitudinally vibrated. As the sludge spreads (wavelength of the meridians), the sludge periodically acts by repeated compression and expansion, and is preferably irradiated for 30 minutes.

This repeated operation decomposes the sludge, and the decomposed sludge is supplied to the digester through the sludge supply pipe 102.

When the raw sludge is supplied, concentrated sludge is added to the digester, and microorganisms contained in the concentrated sludge ingest the raw sludge and are reductively decomposed.

On the other hand, the temperature maintaining unit 400 maintains the temperature inside the digester by continuously or intermittently spraying steam into the digester. Of course, the temperature inside the digester is the most appropriate temperature for the microorganisms to inhabit, the steam is passed through the heat exchange unit 440 and the heated water is used.

As described above, the water of the heat exchange part may use discharged water to save energy.

3 is a view showing another embodiment of the present invention, wherein at least two or more radially centering the digestion tank 100 are preferably configured such that four input units 300 and four temperature maintaining units 400 are disposed. to be.

Such an embodiment has an advantage of effectively supplying sludge and steam according to the condition of the digester.

That is, even if the sludge injected into one input unit is not irradiated with ultrasonic waves for 30 minutes, the other input unit can replenish it, and steam is the same.

1 is a system diagram showing an example of a digester according to the present invention,

2 is an enlarged view of a digester according to the present invention;

3 is a plan view showing another embodiment of the digester according to the present invention.

* Explanation of symbols for the main parts of the drawings

10: digester 100: digestion tank

200: stirring part 300: feeding part

320: reaction tank 340: ultrasonic generator

400: temperature holding part

Claims (6)

In the digester for treating sludge generated during sewage and wastewater treatment in sewage and wastewater treatment plants, A digestion tank into which fresh sludge and concentrated sludge are introduced to allow the microorganisms of the concentrated sludge to consume the raw sludge; An agitator configured to stir the raw sludge and the concentrated sludge with a stirring blade connected to a motor installed on an upper portion of the digestion tank; Is installed on one side of the digestion tank, the sludge input unit for discharging the sludge by supplying ultrasonic waves before the digestion tank input; Supplying steam to the digestion tank to maintain the temperature inside the tank to maintain the temperature in which the microorganisms; temperature digestion unit for the sludge reduction, characterized in that consisting of. According to claim 1, wherein the sludge inlet unit is installed adjacent to the digestion tank and the reaction tank to feed the raw sludge into the digestion tank and installed inside the reaction tank irradiated with fresh sludge for 30 minutes ultrasonic sludge Digestion tank for sludge reduction, characterized in that consisting of ultrasonic generator for decomposition. According to claim 2, wherein the reaction tank is to be composed of a double wall having a space between the inner wall and the outer wall, the inner wall is composed of a mesh so that the water content of the sludge introduced therein escapes into the space to control the water content And the ultrasonic generator is provided above and below the inner wall to irradiate the sludge with an ultrasonic wave having a vibration frequency of 16 Hz to 10 Hz. The water holding unit of claim 1, wherein the temperature maintaining unit comprises an injection tube for supplying and supplying steam into the digestion tank, and a heat exchange unit for heating the injection tube, wherein the water supplied to the injection tube maintains a temperature of 20 to 40 ° C. 6. Digester for sludge reduction characterized in that the supply. 4. The digester for sludge reduction according to claim 3, wherein the effluent is recycled after the wastewater treatment process is supplied to the temperature maintaining part. The digestion tank according to claim 1, wherein at least two of the input unit and the temperature maintaining unit are disposed around the digestion tank to supply sludge and steam according to the state of the digester.

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