KR101573014B1 - Using Alkali(a solution, powder) and microbubbles for removal method of sludge(Cell) internal water - Google Patents

Abstract

The present invention relates to a method for reducing the amount of sludge internal water using an alkali and a microbubble merging treatment, and a weight reducing apparatus.
Accordingly, the technical feature of the present invention is that the alkali component is added to the excess sludge so as to weaken the cell membrane structure of the sludge, and the sludge having the weak physical structure is subjected to physical impact by the micro bubble generator, In particular, the dewatering efficiency is greatly improved during the subsequent solid-liquid separation, which leads to a significant decrease in the amount of solids (sludge cake) generated, thereby reducing the associated treatment cost And the amount of final disposal waste is greatly reduced as the pollutant discharge amount is reduced considerably.

Description

TECHNICAL FIELD The present invention relates to a method for reducing the amount of sludge in a sludge by using a combination of alkali and microbubbles,

In the present invention, the alkali component is added to the excess sludge so as to weaken the cell membrane structure of the sludge. The sludge whose physical structure is weakened is subjected to a physical impact by the micro bubble generator, so that the sludge particles are finely broken , Especially the sludge cell membrane, and thus the dewatering efficiency is greatly improved during the subsequent solid-liquid separation, which can significantly reduce the amount of solid matter (sludge cake) generated, thereby reducing the related processing cost And the amount of final disposal waste is also greatly reduced as the amount of pollutant emissions is significantly reduced.

In addition, the present invention relates to a sludge treated with an internal water reducing amount, wherein solid matter is discharged during solid-liquid separation, the filtrate is formed to recover phosphorus and then used as a pH adjuster in a primary treatment or transferred to a raw water storage tank, Medical bone materials, industrial concrete mixtures, etc., thereby promoting the green cycle of resource recycling and efficient utilization of energy, thereby minimizing the emission of additional greenhouse gases and pollutants.

In addition, the present invention significantly improves the operation efficiency of the wastewater treatment plant during the treatment of the water-reduced solid matter, thereby improving the economical efficiency and productivity of production facilities and operation lines.

Generally, sludge (solidified by aggregation of foreign matter and impurities) is obtained by solidifying slurry (dilute liquid form containing impurities in wastewater liquid) with polymer flocculant.

Such sludge is filtered and dehydrated after filtering the foreign matter and impurities floating in sewage and industrial wastewater to minimize water content, and most of the sludge is landfilled with waste.

On the other hand, sludge is the most important factor for minimizing the water content and maximizing the amount of dehydrated sludge as compared with the concentration due to disposal and landfilling, and this purpose is achieved by effectively concentrating and dehydrating the sludge.

However, the conventional sludge treatment apparatus is composed of a simple concentrator for concentrating and concentrating the slurry, or a simple compressing / dehydrator for dewatering the concentrated sludge, so that it is difficult to expect an effective water content when the sludge is highly concentrated, The sludge can not be completely dewatered, resulting in a problem of deteriorating productivity.

More specifically, the moisture in the sludge is present in the form of pore water, capillary bonding water, surface adhesion water, and internal water, and has a moisture content of about 80% when a general dehydration process is applied.

In order to lower the water content of the sludge, it is necessary to remove the internal water (water) retained in the cytoplasm. However, since the cell membrane and the protective mucus interfere with decomposition, the anaerobic digestion is not well decomposed. The problem is continuing.

On the other hand, the cell membrane of the sludge is composed of protein, and the protein is a polymer compound containing nitrogen. In addition to the structure in which the constituent amino acids are connected by peptide bonds, ionic bonds, hydrogen bonds, disulfide bonds, hydrophobic bonds, The high-order structure of the protein is maintained and exhibits a unique form and property.

Since the amino acids constituting the protein are generally easily dissolved by the alkali, when the alkali treatment of the sludge is performed, the hydrogen bonds of the proteins constituting the sludge cell membrane are weakened, thereby facilitating the sludge disruption.

In addition, the wastewater containing municipal sewage, livestock wastewater, agricultural wastewater and industrial wastewater contains not only organic matter as a BOD component but also nutrient salts including nitrogen and phosphorus.

These increases in nutrients have destroyed the ecosystem balance and have caused problems of eutrophication.

Therefore, various methods and devices have been developed to treat nutrients including organic matter, nitrogen, and phosphorus.

Conventional wastewater treatment methods are mainly for removing organic substances present in wastewater, and processes such as pretreatment, primary treatment, secondary treatment, and sludge treatment have been used.

At this time, in the secondary treatment step, biological treatment was performed to remove organic matter.

However, in the biological treatment method, nitrogen and phosphorus can not be removed, and only organic matter is removed.

To solve this problem, Korean Unexamined Patent Publication No. 2000-40351 discloses a method for treating wastewater comprising a flow control tank, a contact tank, a nitrification tank, a phosphorus absorption tank, a tidal tank, a treated water tank, , There is disclosed a method of simultaneously treating nitrogen and phosphorus using activated sludge (microorganism) in a biological reactor consisting of a first aerobic tank, a first settling tank, a second aerobic tank, an anaerobic tank, anoxic tank and a third aerobic tank.

However, in the above-mentioned prior arts, since the activated sludge adsorbs organic matter, there arises a problem such as a drop in sludge settling speed and a need for a device for disposing nitrification activated sludge.

Also, in the conventional method of treating wastewater using a membrane process, organic matters such as BOD and COD are treated, and suspended solids (SS) generated after denitrification are stabilized through a separation membrane and treated with a high concentration of sewage. However, there is a problem that the phosphorus treatment level, which is strengthened recently, is not satisfied.

On the other hand, as an improvement of the above conventional problem, Korean Patent No. 1142860 discloses a method for reducing alkali wastewater using alkaline sludge, alkaline sludge, and a wastewater treatment apparatus &Quot;, the total phosphorus content of the wastewater can be reduced to 0.5 mg / L or less by using alkali sludge, and Korean Patent No. 1237408 entitled "Wastewater Treatment System Having Activated Sludge Reservoir & Nitrogen abatement method "of the present invention not only reduced the total phosphorus content but also reduced the total nitrogen to 5 mg / liter or less.

However, in order to utilize alkaline sludge in the above-mentioned patents, since air aeration must be continuously performed in order to maintain the pH of the pH adjusting tank introduced between the anoxic tank and the membrane tank at 6.5 to 7.5, There is a need for a method that can do this.

1. Korean Patent Publication No. 2000-40351 (published on May 5, 2000)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is a technical object of the present invention to provide a sludge in which an alkali component is injected into an excess sludge to weaken the cell membrane structure of the sludge, The sludge particles are broken down at the time of crushing, and the hydrogen bonding with the protein constituting the sludge cell membrane is weakened, so that the dewatering efficiency is greatly improved during the subsequent solid-liquid separation step. This is because the amount of solids (sludge cake) And the amount of final disposal wastes is greatly reduced as the amount of pollutants discharged is significantly reduced. The method for reducing the internal volume of sludge using the alkali and microbubble merging method And a device for weight reduction thereof, There is.

In addition, the present invention relates to a sludge treated with an internal water reducing amount, wherein solid matter is discharged during solid-liquid separation, the filtrate is formed to recover phosphorus and then used as a pH adjuster in a primary treatment or transferred to a raw water storage tank, It is aimed to promote the recycling of green bone materials and energy use efficiency by minimizing the emission of additional greenhouse gases and pollutants by recycling them as medical bone materials and industrial concrete mixtures. .

It is another object of the present invention to provide a method for improving the efficiency of the wastewater treatment plant during the treatment of the water-reduced solid matter, thereby improving the economical efficiency and productivity of the production facility and the operation line.

In order to achieve the above object, the present invention provides a method for reducing the amount of sludge in an aqueous sludge, comprising the steps of: adding an alkali solution or an alkali powder to a sludge storage tank to weaken hydrogen bonding with proteins constituting the cell membrane of the excess sludge, (Alkali treatment). In the sludge whose physical structure is weakly weakened, the micro bubble generator is subjected to impact or physical force to finely pulverize the sludge, thereby reducing the internal moisture of the final dewatered solid (sludge cake) The content is greatly reduced.

Accordingly, the sludge internal water amount reducing apparatus according to the present invention comprises a chemical tank 100 for alkali treatment of surplus sludge of a reaction tank 40 formed in the storage tank 10 or at the downstream end of the storage tank 10; And is formed at one side of the alkaline treated sludge storage tank 10 and is circulated by the water supply and drainage pipes or formed at one side of the reaction tank formed at the downstream side of the drainage side of the storage tank 10, A micro bubble generator 200 for causing the alkali treated sludge to be impacted or subjected to physical force to be crushed; .

At this time, the chemical tank 100 is an alternative embodiment, in which a dispenser 300 having a plurality of spray holes 310 and a spray tube 320 formed at the end of the alkaline solution or alkali powder is discharged, The alkaline solution is mixed with the alkaline solution when the alkaline solution or alkaline powder is added.

The micro bubble generator 200 is an alternative embodiment of the present invention in which the venturi tube 210 is formed so as to apply shock or physical force to the sludge whose hydrogen bonding structure is weakened by the alkali treatment and the physical properties are lost An ultrasonic vibration device 220 having a vibration type articulated pipe 221 is formed on one side of the venturi pipe 210 or the perforated network 230 so as to form a perforated network 230 having a plurality of crush holes 231, Thereby doubling the crushing efficiency of the sludge.

The dehydrator 20 is an optional embodiment, and it is preferable that a backwashing device 400 is installed in the filtration belt line so as to increase dehydration efficiency in solid-liquid separation.

As described above, according to the present invention, an alkali component is injected into an excess sludge so that the cell membrane structure of the sludge is weakened, and the sludge having a weak physical structure is subjected to physical impact by a micro bubble generator, In particular, the dehydration efficiency is greatly improved during the subsequent solid-liquid separation, which is a post-production process, because the hydrogen bond with the protein constituting the sludge cell membrane is weakened. This reduces the amount of the solid matter (sludge cake) The amount of final disposal waste can be greatly reduced as the amount of pollutant discharge is reduced considerably.

In addition, the present invention relates to a sludge treated with an internal water reducing amount, wherein solid matter is discharged during solid-liquid separation, the filtrate is formed to recover phosphorus and then used as a pH adjuster in a primary treatment or transferred to a raw water storage tank, Medical bone material, industrial concrete mixture, etc., thereby enabling the circulation of green technology and the efficiency of energy utilization to be activated, thereby minimizing the emission of additional greenhouse gases and pollutants.

In addition, the present invention greatly improves the operation efficiency of the wastewater treatment plant during the treatment of the water-reduced solids, thereby improving the economical efficiency and productivity of the production facility and the operation line.

1 is a schematic block diagram showing a sludge internal water reducing apparatus according to the present invention,
2 to 3 are views showing an example of a dispenser according to the present invention,
4 is an exemplary view showing a venturi tube according to the present invention,
5 is an exemplary view illustrating a perforated network according to the present invention,
6 to 8 are views showing an ultrasonic vibration apparatus having a vibrating articulated tube according to the present invention,
9 is an exemplary view showing a backwashing apparatus according to the present invention.
FIG. 10 is an example of a weight reducing apparatus to which a reaction tank is attached as another embodiment of FIG. 1;

Hereinafter, the present invention will be described in detail with reference to the drawings.

As shown in FIGS. 1 to 10, the sludge internal water reduction method of the present invention reduces the hydrogen bonding with the proteins constituting the cell membrane of the excess sludge, thereby improving the dewatering efficiency during the subsequent solid- The microbubble generator is subjected to impact or physical force to cause the sludge to be finely pulverized by applying an alkali solution or an alkali powder to the microbubble generator with respect to the sludge whose physical properties are weakly weakened, Sludge cake) is greatly reduced.

More specifically, the alkali solution or the alkali powder is added to the excess sludge, and the microbubble generator is pulverized to reduce the internal moisture of the sludge, so that the amino acid constituting the protein is generally easily alkaline When the sludge is treated with alkali, the hydrogen bond of the protein constituting the sludge cell membrane can be weakened and the sludge can be easily broken.

That is, according to this principle, the internal number of the sludge can be more efficiently separated.

Further, the micro bubble generator (apparatus) has basically already proposed a technique of a publicly known technique, and the principle of generation of the micro bubble and the apparatus are well known, and a detailed description thereof will be omitted.

However, the venturi tube and the ultrasonic vibration apparatus described as the technical features of the present invention are newly derived inventions from general technical thought, which will be described later.

Further, as another embodiment of the present invention, it is possible to further include means for recovering the internal water of phosphorus removed from the excess sludge.

That is, in order to recover phosphorus by destruction of sludge cells, NH ₄ ⁺ aqueous solution, calcium aqueous solution, and Mg aqueous solution are injected to generate strobytes to separate and recover phosphorus.

Meanwhile, as shown in FIG. 1 or FIG. 10, the sludge internal water reducing apparatus according to the present invention is composed of a chemical tank containing alkali and a micro bubble generator.

At this time, the chemical tank 100 is formed so as to be alkali-treated with the surplus sludge of the reaction tank 40 formed in the storage tank 10 or the rear end of the storage tank 10.

The micro bubble generator 200 is formed at one side of the alkali treated sludge storage tank 10 and is formed at one side of the reaction tank formed at the drainage side downstream of the storage tank 10, So that the sludge is subjected to impact or physical force to crush the alkali-treated sludge before solid-liquid separation by the dehydrator 20.

An aeration tank 30 is formed to supply air to a mixed liquid of wastewater or sludge (sludge) and then stir to perform adsorption and oxidative decomposition of organic matter by aerobic bacteria. From the aeration tank 30, The excess sludge transferred through the storage tank 10 is stored.

At this time, the chemical tank 100 is formed on one side of the storage tank 200 to inject the alkali solution or the alkali powder.

At this time, the micro bubble generator 200 is formed on the other side of the storage tank 10 to apply an impact or a physical force to the sludge in the storage tank.

Thus, the dehydrator 20 is formed so as to solid-liquid-separate the finely pulverized sludge by the impact or physical force of the alkali solution or alkali powder of the chemical tank and the micro bubble generator.

Alternatively, the present invention may be provided with a reaction tank 40 at the rear end of the storage tank 10, and may be provided with a separate phosphorus recovery tank 50, a pH adjuster tank 60 and a primary treatment water tank 70 Is formed so as to be able to form a series of processing lines as a connection channel (see Fig. 10).

The storage tank 10 is formed to be mixed through an agitator having a separate impeller so as to be evenly mixed with an alkali solution or an alkali powder.

2 to 3, a dispenser 300 having a plurality of spray holes 310 and a plurality of spray holes 320 formed therein is formed in the storage tank 10, The alkali component is mixed with the uniform distribution when the alkali solution or the alkali powder is added.

At this time, the injection pipe 320 is connected to the storage tank or the reaction tank 10, 40 so as to be submerged in the sludge so as to be installed in at least one of them, and is coupled in the orthogonal (horizontal) direction with respect to the main supply pipe formed at the center.

At this time, the main supply pipe is connected to a pump (PUMP) formed in a storage tank or a reaction tank, and the pump is connected to the chemical tank 100 through a pipe.

That is, the alkali solution or the alkali powder of the chemical tank is pumped from the pump, passed through the main pipe through the injection pipe, and injected into the storage tank or the reaction tank by the injection hole.

At this time, the main supply pipe is provided with a non-oxidant pipe on the outer circumferential surface in the form of a double pipe, and the non-oxidant pipe is formed as a porous (or mesh) pipe to supply an alkali solution or an alkali powder through a separate line from the pump .

At this time, the pump, the main supply pipe, and the scattering pipe are opened / closed by the first valve (V1) and the second valve (V2), and they are separately opened or closed simultaneously according to the amount and concentration of the sludge in the storage tank or reaction tank, .

It is preferable that a scratching scraper is provided on the outer circumferential surface of the scattering tube so as to prevent adsorption or deposition of sludge.

Such a scraper is formed in a circular band shape so as to have an inner diameter corresponding to the outer diameter of the scatterer.

That is, the connection pin formed on the outer circumferential surface of the scraper is connected to the storage tank or the connection pipe branched out of the reaction tank so that the operator can lift the sludge up or down manually from the storage tank or the reaction tank, do.

At this time, the buoyant body may be coupled to one side of the connection pin, and may be naturally lifted or lowered in a non-powered manner depending on the level of the sludge in the storage tank or reaction tank.

In other words, the injection tube and the non-acid tube are designed so that the alkali component transferred from the chemical tank is uniformly mixed with the sludge.

4 to 5, the microbubble generator 200 may include a sludge (a state in which the hydrogen bond is weakened from the protein membrane by the alkali treatment) The perforated pipe 230 having the venturi pipe 210 or the crushing hole 231 is formed so that an impact or a physical force can be exerted on the perforated pipe 230.

The venturi tube is a syringe having air introduced from the outside as a pressurizing tank to allow oxygen to dissolve in the sludge, and then passes through the sludge. The sludge being conveyed by the diameter difference, that is, the pressure difference, It is formed to be crushed like an explosion.

In addition, the perforated network has a plurality of crush holes formed on its surface. Like the above-mentioned venturi pipe, the sludge passing through a pipe (hose or transfer pipe) passes through a crushing ball which is suddenly narrowed from a wide diameter, .

In this case, the perforated network is provided between the flanges or the unions to be coupled to the pipeline, and it is preferable that the perforated network is easily replaced when it is damaged due to clogging, abrasion, or the like.

That is, the alkali treated sludge is characterized in that the pulverization efficiency is greatly improved through the venturi pipe or the perforated network.

An ultrasonic vibration device 220 having a vibration type articulated pipe 221 is formed on one side of the venturi pipe 210 or the perforated network 230 to double the sludge crushing efficiency.

As shown in FIGS. 6 to 8, the vibration type articulated pipe 221 of the ultrasonic vibration device 220 is formed on a line between the front and rear pipes of the venturi pipe or the perforated pipe, and direct secondary impact ) So as to further promote the internal hydrolysis of the sludge.

At this time, the vibratory articulated pipe 221 is coupled with a plurality of articulated rings 221-1, and the articulated rings 221-1 are connected to each other in the axial direction so as to form a series of pipes along the longitudinal direction. .

The joint ring is a hollow body having a first arc-shaped first spherical surface having curved surfaces of different sizes along the circumference set on the one side and the other side of the axial outer circumferential surface with reference to the center points (C-1, C-2) The back surface 221-11 and the second sphere back surface 221-12 are formed.

At this time, an arc-shaped insertion surface 221-13 formed by a circumference is formed on the inner periphery of the first sphere back surface 221-11, and when the second sphere rear surface 221-12 of the neighboring joint ring is inserted corresponding thereto, (C-1, C-2) in the circumferential direction.

That is, the ultrasonic vibration device is applied to the sludge conveyed along the inner hollow of the joint ring to impart basic ultrasonic vibration, thereby increasing the crushing efficiency of the sludge. In addition, So as to be easily variable.

At this time, the assembling socket rings 221-2 are formed on the opposite sides of the joint rings in the longitudinal direction of the plurality of joint rings.

The socket ring 221-2 is a hollow body corresponding to the joint ring. The socket ring 221-2 is connected to the first sphere rear surface 221-11 or the second sphere rear surface 221-12, And the fourth spherical surface 221-14 or the fourth spherical surface 221-15 is formed at one end of the third spherical surface 221-14 or the fourth spherical surface 221-15, .

At this time, it is preferable that a rotation interval G generated from the curved sections of the first and second sphere rear faces has an angle difference of at least 5 degrees formed by the distance moved along the arc shape.

This is to prevent the sludge passing through the inner cavity from reaching the trail during deposition and being deposited or piled up.

That is, the articulated pipe is formed so as to provide ultrasonic vibration without interfering with the flow velocity generated when the sludge is conveyed.

At this time, it is preferable to provide a separate heating means on the outer peripheral surface of the articulated pipe so as to prevent the occurrence of winter clogging or freezing due to heat generation.

The dehydrator 20 is an optional embodiment. As shown in FIG. 9, it is preferable that a backwashing device 400 is installed to increase the dehydration efficiency in solid-liquid separation.

At this time, the backwash device is formed with a main water pipe connected from a water pump, and a plurality of branch pipes are assembled in a flexible form on the outer circumferential surface of the water pipe, and when the centrifugal drive of the dehydrator is performed, (Solid matter) is sprayed in accordance with the periodic setting or the intermittent setting, which is formed so as to greatly improve the dewatering efficiency.

At this time, it is preferable that the water pump pumped the filtered filtrate in the dehydrator, not in the separate external washing water supply, to recycle and reuse.

Further, in the present invention, it is preferable that a sound absorbing material or a heat insulating material capable of canceling sound waves, vibration and the like is attached to the outer peripheral surface of the micro bubble generator.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims and their equivalents. Of course, such modifications are within the scope of the claims.

100 ... chemical tank 200 ... micro bubble generator
210 ... Venturi tube 220 ... Ultrasonic vibration device
221 ... vibrating finger 300 ... dispenser
310 ... spray hole 320 ... spray nozzle
400 ... Backwashing device

Claims (5)

delete A chemical tank 100 for treating the excess sludge of the reaction tank 40 formed in the storage tank 10 or the drainage-side rear stage of the storage tank 10 with alkali; And is formed at one side of the alkaline treated sludge storage tank 10 and is circulated by the water supply and drainage pipes or formed at one side of the reaction tank formed at the downstream side of the drainage side of the storage tank 10, A micro bubble generator 200 for causing the alkali treated sludge to be impacted or subjected to physical force to be crushed; A sludge internal water reducing apparatus using an alkali and a microbubble merging process,
The chemical tank 100 is provided with a dispenser 300 having a plurality of spray holes 310 and a spray pipe 320 formed at the end of the alkaline solution or alkali powder discharged therefrom to supply the alkali solution or alkali powder to the sludge The microbubble generator 200 is formed so that the alkali component is mixed with the uniform distribution and the hydrogen bonding structure is weakened by the alkali treatment and the sludge whose physical properties are impaired is applied to the venturi pipe 210 And an ultrasonic vibrator having a vibration type articulated pipe 221 is installed on one side of the venturi pipe 210 or the perforated network 230 so as to form a perforated network 230 having a plurality of crush holes 231, 220) is formed so that the crushing efficiency of the sludge is doubled. A sludge internal water reducing apparatus using the alkali and microbubble merging treatment. delete delete 3. The method according to claim 2, wherein the dehydrator (20) is provided with a backwashing device (400) in the filtration belt line so as to increase the dewatering efficiency in solid-liquid separation. Device.

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