KR101227556B1 - High efficiency sludge reduce apparatus - Google Patents

Abstract

PURPOSE: The high efficiency sludge reducing apparatus is provided to consequently reduce the load of nitrogen(N) and phosphorus(P) by efficiently increasing the sludge decrement and reducing inorganic sludge. CONSTITUTION: The high efficiency sludge reducing apparatus comprises a MAP(Magnesium Ammonium Phosphate) growth tub(120), a biological reduction facility(130), a hydrocyclone(140), a second solubilizing preprocessor(150), a branch line(161), and a valve(162). The MAP growth tank is supplied with sludge and magnesium to collect the MAP formed by the MAP production reaction and ejects reacted water. The biological reduction facility stores the ejected reacted water from the MAP growth tub and reduces sludge by a biological process. The hydrocyclone is supplied with processed water from the biological reduction facility through a pumping force and provides separated inorganic sludge from a centrifuge to the MAP growth tub. The second solubilizing preprocessor is installed at a supply line supplying the processed water including sludge with an inorganic component, and the processed water is resolved by a physical or a chemical method. The branch line is branched from the front end of the second solubilizing preprocessor to the supply line to supply processed water to the biological reduction facility. The valve is installed at the supply line and the branch line to select the processed water supply of the biological reduction facility or the water flow of the second solubilizing preprocessor. [Reference numerals] (110) First solubilizing pre-processor; (150) Second solubilizing pre-processor; (170) Solid-liquid separator; (180) Dehydrator; (AA) Sludge; (BB) Chemical

Description

High efficiency sludge reduce apparatus

The present invention relates to a sludge reduction system, and more particularly, to a high efficiency sludge reduction system having excellent sludge reduction efficiency.

Sludge, including sewage sludge, manure sludge and food waste sludge, is increasing year by year. Such sludge is prohibited from dumping at sea, and it is recommended to operate an anaerobic digester with a high reduction effect.

The sludge reduction device according to the prior art is a "sludge reduction device of anaerobic digester" of Patent Registration No. 10-0745201 registered with the Korean Intellectual Property Office, which is concentrated from the primary sludge and the secondary sedimentation basin Anaerobic digestion tank is a secondary sludge is introduced and mixed with the digestion process of the mixed sludge formed; An inlet portion connected to an upper portion of the anaerobic digester to discharge the mixed sludge and inflow of the secondary sludge, and an inlet portion to which the mixed sludge circulated connected to the lower portion of the anaerobic digester flows and inflow of the primary sludge A circulation pipe formed; And a steam mixer provided at the inlet and connected to a steam line through which the steam generated by the boiler moves to warm the mixed sludge passing through the inlet.

However, the conventional sludge reduction apparatus has a limitation in increasing the volume reduction efficiency of the drawn sludge, and the reduction efficiency of the inorganic sludge is significantly low, and thus, it is not possible to reduce the nitrogen and phosphorus loads, and thus, blockage of pipes, etc. in a subsequent process. It caused a problem.

In order to solve the conventional problems as described above, the present invention can increase the efficiency of sludge reduction, reduce the inorganic sludge, thereby reducing the load of nitrogen (N), phosphorus (P) The purpose is to make it possible.

Other objects of the present invention will be readily understood through the following description of the embodiments.

In order to achieve the object as described above, according to an aspect of the present invention, by supplying the sludge and the chemical to recover the MAP produced by the MAP production reaction, the MAP growth to discharge the treated water after the reaction article; A biological weight reduction facility in which treated water discharged from the MAP growth tank is stored and reduces sludge by biological treatment of the treated water; And a hydrocyclone supplied with the treated water from the biological weight reduction facility by the pumping force of the pump to separate the sludge containing the inorganic component by the centrifugal force and supply the sludge to the MAP growth tank.

It may further include a first solubilization pretreatment unit installed at the front end of the MAP growth tank, solubilizing the sludge by a physical or chemical method to supply to the MAP growth tank.

A second solubilization pretreatment unit installed in a supply line for supplying the treated water from which the sludge containing the inorganic component is separated from the hydrocyclone to the MAP growth tank, and solubilizing the treated water by a physical or chemical method; A branching line branched from the front end of the second solubilization pretreatment unit in the supply line to supply the treated water to the biological reduction facility; And a valve installed at the supply line and the branch line to select the treatment water flow to the second solubilization pretreatment unit or the treatment water supply to the biological reduction facility.

The MAP growth tank has a stirrer for mixing inside the main body, and a ring-shaped partition wall is installed around the stirrer so as to be spaced apart from the bottom surface of the main body, thereby inducing precipitation in the space between the partition wall and the inner circumferential surface of the main body. Space can be formed.

A solid-liquid separator installed at a rear end of the biological weight reduction facility and performing a solid-liquid separation process for the treated water discharged from the biological weight reduction facility; And a dehydrator installed at a rear end of the solid-liquid separator and performing a dehydration process for the sludge separated from the solid-liquid separator.

According to the high efficiency sludge reduction system according to the present invention, the efficiency of sludge reduction can be increased, and inorganic sludge can be reduced, thereby reducing the load of nitrogen (N) and phosphorus (P).

1 is a block diagram showing a high efficiency sludge reduction system according to an embodiment of the present invention,
2 is a plan sectional view showing a MAP growth tank of the high efficiency sludge reduction system according to an embodiment of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but is to be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention, And the scope of the present invention is not limited to the following examples.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and redundant explanations thereof will be omitted.

1 is a block diagram showing a high efficiency sludge reduction system according to an embodiment of the present invention.

Referring to FIG. 1, the high efficiency sludge reduction system 100 according to an embodiment of the present invention includes a MAP growth tank 120, a biological reduction system 130, and a hydrocyclone 140.

The first solubilization preprocessing unit 110 may be installed at the front end of the MAP growth tank 120. The first solubilization pre-processing unit 110 solubilizes the supplied sludge by a physical or chemical method and supplies the supplied sludge to the MAP growth tank 120. For example, the first solubilization pretreatment unit includes an ultrasonic grinder that physically grinds the sludge using ultrasonic waves. Can be.

MAP growth tank 120 is supplied with solubilized sludge and chemical (eg, magnesium) from the first solubilization pre-processing unit 110 (MAP) produced by MAP production reaction Magnesium Ammonium Phosphate (MgNH ₄ PO ₄ , or struvite) can be recovered and the treated water discharged. MAP growth tank 120 is magnesium (amagnesium), ammonium (ammonium), phosphate (phosphate) should be given to the reaction to generate MAP, through which the reaction according to the formula (1) below to generate the MAP. Here, magnesium is a limited nutrient and can be supplemented for the reaction. For this purpose, not only magnesium salt, but also phosphate may be added to the MAP growth tank 120 as necessary. Therefore, the MAP growth tank 120 can remove ammonia with coarse MAP crystals, which are inorganic sludges, using phosphate and magnesium salts, and complement the biological wastewater treatment method.

[Formula 1]

_{^{Mg 2 + + NH 4 + +}} PO 4 3 - + 6H 2 O → MgNH 4 PO 4 · 6H 2 O (↓)

The MAP growth tank 120 may maintain a pH of 7-11 to favor MAP growth, reduce the solubility of MAP in an alkaline solution, promote precipitation, and maintain an alkaline agent such as NaOH to maintain a proper pH. It can be put in. In addition, when the MAP growth tank 120 is applied to anaerobic digested sludge, the pH of the digested sludge is maintained at about 7, and when the aeration is performed, the pH is raised to about 8 in the process of CO ₂ degassing, so the alkaline agent is added. This is not necessary or has the advantage of minimizing.

On the other hand, ammonia stripping increases the pH of water by adding an alkali agent and removes ammonia by contacting with air. In order to remove ammonia in water by degassing, ammonia needs to exist as a gas. Ammonium ions in water are parallel to the gaseous ammonia, as shown in the following formula (2).

[Formula 2]

NH ₄ ⁺ ↔ NH ₃ + H ⁺

Here, when the water temperature is 25 ℃, most of the pH is NH ₄ ^{+ at} pH 7, the distribution of both is the same at pH 9.25, 98% is present in the form of NH ₃ at pH 11. That is, as the pH increases above 7, the equilibrium shifts to the right and the ammonium ions are removed by degassing by changing to ammonia. As a result of experiment by adjusting to pH 8.0 ~ 10.8, ammonia removal rate was 37 ~ 80% in the pH range of 8 ~ 9.3. Therefore, a considerable amount of ammonia can be removed in the process of maintaining the pH above 8 and performing aeration, thereby further reducing the nitrogen load of the treated water.

As shown in FIG. 2, the MAP growth tank 120 is provided with a stirrer 122 for mixing in the main body 121 that provides a space for the MAP generation reaction to occur, and around the stirrer 122. Ring-shaped partitions 123 having a cross section of various shapes, including circular or polygonal, are installed to be spaced apart from the bottom surface of the main body 121 to induce precipitation in the space between the partition 123 and the inner circumferential surface of the main body 121. The precipitation induction space 124 may be formed. Therefore, the MAP growth tank 120 is a flow induced by the operation of the stirrer 122 is moved to the edge side to move to the inside of the precipitation induction space 124, the precipitation induction space (blocked by the partition wall 123 ( 124) the flow is relaxed to increase the settling efficiency. On the other hand, the stirrer 122 may include an impeller (impeller) is installed to rotate inside the MAP growth tank 120 and a stirring motor for rotating the impeller.

The biological weight reduction facility 130 stores the treated water discharged from the MAP growth tank 120, reduces the sludge by biological treatment of the treated water, and a stirrer may be installed for the internal mixing. Meanwhile, the solid-liquid separator 170 may be installed at the rear end of the biological weight reduction facility 130. Here, the solid-liquid separator 170 to separate the sludge from the treated water by performing a solid-liquid separation process for the treated water discharged from the biological weight reduction facility 130, for example, a gravity settling facility may be applied, in addition to the pressure floating Various solid-liquid separation processes such as mechanical filtration and membrane filtration can be applied. In addition, a dehydrator 180 may be installed at the rear end of the solid-liquid separator 170. Here, the dehydrator 180 is to perform a dehydration process for the sludge separated from the solid-liquid separator 170.

Hydrocyclone 140 receives the treated water from the biological weight reduction facility 130 by the pumping force of the pump 141 to separate the sludge containing the inorganic component by centrifugal force to supply the MAP growth tank 120. . The hydrocyclone 140 separates the solids of the dispersed phase from the fluid in the continuous phase by using centrifugal force. The sludge containing the inorganic component having a relatively high specific gravity contained in the treated water is rotated in the circumferential direction. The centrifugal force moves away from the mammary gland in the direction of the wall and is separated and descended, so that the treated water with a relatively small specific gravity flows out along the upward flow to the center side.

High-efficiency sludge reduction system 100 according to the present invention may be installed a second solubilization pre-processing unit 150, the second solubilization pre-processing unit 150 is a sludge containing inorganic components separated from the hydrocyclone 140 It is installed in the supply line 151 for supplying the treated water to the MAP growth tank 120, so that the treated water is solubilized by physical or chemical methods, for example, an ultrasonic mill for physically crushing sludge using ultrasonic waves Can be used.

In the supply line 151, the treated water may be supplied to the biological weight reduction facility 130 by the branch line 161 branched from the front end of the second solubilization preprocessing unit 150, wherein the supply line 151 and the branch line The valve 162 may be installed at the 161. Here, the valve 162 selects the flow of the treated water to the second solubilization pre-processing unit 150 or the supply of the treated water to the biological reduction facility 130, and as in this embodiment, the supply line 151 and the branch line 161. It may be made of a three-way valve is installed in the connection portion of, as another example may be made of a bidirectional valve installed in the supply line 151 and the branch line 161, respectively.

On the other hand, the high-efficiency sludge reduction system 100 according to the present invention can be applied as an aerobic digestion process, for example, in addition to a variety of treatment processes combined anaerobic tank, anoxic tank, aerobic tank can be introduced.

According to the high-efficiency sludge reduction system according to the present invention, the efficiency of sludge reduction can be increased, and inorganic sludge can be reduced, thereby reducing the load of nitrogen (N) and phosphorus (P). .

Although the present invention has been described with reference to the accompanying drawings, it is to be understood that various changes and modifications may be made without departing from the spirit of the invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the following claims.

110: first solubilization unit 120: MAP growth tank
121: main body 122: agitator
123: bulkhead 124: sedimentation induction space
130: biological reduction facility 140: hydrocyclone
141: pump 150: second solubilization pretreatment unit
151: supply line 161: branch line
162: valve 170: solid-liquid separator
180: dehydrator

Claims (5)

MAP growth tank to receive the sludge and magnesium to recover the MAP produced by the MAP production reaction, and to discharge the treated water after the reaction;
A biological weight reduction facility in which treated water discharged from the MAP growth tank is stored and reduces sludge by biological treatment of the treated water;
A hydrocyclone supplied with the treated water from the biological weight reduction facility by a pumping force of a pump to separate sludge containing inorganic components by centrifugal force and supply the sludge to the MAP growth tank;
A second solubilization pretreatment unit installed in a supply line for supplying the treated water from which the sludge containing the inorganic component is separated from the hydrocyclone to the MAP growth tank, and solubilizing the treated water by a physical or chemical method;
A branching line branched from the front end of the second solubilization pretreatment unit in the supply line to supply the treated water to the biological reduction facility; And
And a valve installed at the supply line and the branch line to select the flow of the treated water to the second solubilization pretreatment unit or the supply of the treated water to the biological reduction facility. The high-efficiency sludge reduction system according to claim 1, further comprising a first solubilization pretreatment unit which is installed at the front end of the MAP growth tank and solubilizes the sludge by physical or chemical methods to supply the MAP growth tank. delete The method of claim 1, wherein the MAP growth tank,
A stirrer for mixing is installed inside the main body, and a ring-shaped partition is installed around the stirrer so as to be spaced apart from the bottom surface of the main body so that a precipitation induction space is formed in the space between the partition and the inner circumferential surface of the main body. , High efficiency sludge reduction system. The apparatus of claim 1, further comprising: a solid-liquid separator installed at a rear end of the biological weight reduction facility and performing a solid-liquid separation process for the treated water discharged from the biological weight reduction facility; And
And a dehydrator installed at a rear end of the solid-liquid separator and performing a dehydration process for the sludge separated from the solid-liquid separator.

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