KR20150026262A - Apparatus and method for sludge treatment using mixed micro-organisms - Google Patents

Abstract

The present invention relates to a wastewater and sludge treatment apparatus and to a method thereof, which can maximize the sludge decomposition efficiency and effectively remove odor causing materials generated in the sludge decomposition process by inputting an optimal combination of microorganisms according to the phase of sludge when decomposing sludge through aerobic digestion. The wastewater and sludge treatment apparatus using specific microorganisms according to the present invention comprises a plurality of microorganism supply tanks for storing and supplying mutually different types of microorganisms for decomposing organics; a microorganism mixing tank for manufacturing specific microorganisms by mixing the microorganisms supplied form the plurality of microorganism supply tanks; a microorganism contact tank for fermenting sludge by contacting the specific microorganisms and the sludge under an aerobic condition; a sludge oxidation tank for receiving the fermented sludge from the microorganism contact tank, and dissociating and decomposing the sludge through the reaction of the specific microorganisms under an aerobic condition; a separation biological reaction tank for separating the sludge supplied form the sludge oxidation tank into solid and liquid; and a deodorization and microorganism activation device for activating microorganisms in the waste sludge by mixing minerals with the waste sludge discharged from the separation biological reaction tank, and returning the sludge including the activated microorganisms to the sludge oxidation tank.

Description

Technical Field [0001] The present invention relates to an apparatus and a method for treating sewage sludge using a specific microorganism,

The present invention relates to an apparatus and a method for treating sewage sludge using specific microorganisms. More particularly, the present invention relates to an apparatus and method for treating sewage sludge using specific microorganisms, The present invention relates to an apparatus and a method for treating sewage sludge using a specific microorganism capable of effectively removing odor causing substances generated in a decomposition process.

Sludge treatment technology can be roughly divided into aerobic digestion and anaerobic digestion. Aerobic digestion is also expressed as endogenous respiration in such a way that microorganisms consume their protoplasts to maintain cellular activity as the useful substrate depletes. Generally, conventional aerobic digestion, high purity-oxygen aerobic digestion, and self-exothermic aerobic digestion are included in typical aerobic digestion processes. Anaerobic digestion is a major step in stabilizing the sludge, generating enough methane gas to meet the energy required to operate the treatment plant. Basic processes for anaerobic digestion include mesophilic anaerobic digestion, high temperature anaerobic digestion, and phase separation processes.

Korean Patent Application No. 2009-78028 discloses a method of reducing anaerobic sludge by inducing endogenous respiration by installing an anaerobic tank on the return line. However, in the conventional sludge disposal technique, . Korean Patent Application No. 2012-7010541 proposes a process of concentration, dewatering and aerobic air drying of sewage sludge. However, when a soluble compound containing Fe ³⁺ is added and mechanical treatment such as crushing and dispersing is additionally performed Is required.

A Ti / RuO ₂ mesh plate electrode was used for the enhancement of waste activated sludge aerobic digestion by electrochemical pre-treatment, Li-Jie Song, Water research (Li-Jie Song) 44 (2010) 4371-4378 ' (2002): 97-106, (Nevim Genc), for example, discloses a pretreatment technique for converting a substance into a low-molecular substance, and an aerobic digestion of the aerobic digestion of various sludges Although the technology for treating sludge through the digestion process has been proposed, there is a problem that energy is required to maintain the temperature of the digestion tank at a constant temperature.

In addition, conventional sludge treatment techniques based on aerobic digestion and anaerobic digestion are disadvantageous in that it is impossible to remove the odor inducing substances contained in the sludge.

Korean Patent Application No. 2009-78028 Korean Patent Application No. 2012-7010541

Enhancement of waste activated sludge aerobic digestion by electrochemical pre-treatment, Li-Jie Song, Water research (Li-Jie Song) 44 (2010) 4371-4378 Environmental Monitoring and Assessment 80 (2002): 97-106, (Nevim Genc) Investigation of organic nitrogen and carbon removal in aerobic digestion of various sludges,

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made in an effort to solve the above-mentioned problems, and it is an object of the present invention to provide a sludge disintegration apparatus, which is capable of maximizing sludge disintegration efficiency by injecting an optimal combination of microorganisms according to the characteristics of sludge in decomposing sludge through aerobic digestion, And an object of the present invention is to provide an apparatus and a method for treating sewage sludge using a specific microorganism capable of effectively removing an inducing substance.

According to an aspect of the present invention, there is provided an apparatus for treating sewage sludge using specific microorganisms, comprising: a plurality of microorganism supply tanks for storing and supplying different kinds of organic decomposition microorganisms; A microorganism mixing tank for mixing microorganisms supplied from the plurality of microorganism supply tanks to produce specific microorganisms; A microorganism contact tank for fermenting the sludge by bringing the specific microorganism into contact with the sludge under aerobic conditions; A sludge oxidation tank for receiving sludge fermented from the microorganism contact tank and disassembling and decomposing the sludge under the aerobic condition through the action of specific microorganisms; A separation bioreactor for solid-liquid separation of the sludge supplied from the sludge oxidation tank; And a deodorizing and microbial activation device for mixing minerals in waste sludge discharged from the separated bioreactor to activate microorganisms in the waste sludge and returning sludge containing activated microorganisms to the sludge oxidation tank .

Wherein the plurality of microorganism supply tanks comprises a proteolytic microorganism supply tank for storing proteolytic microorganisms that decompose protein-based organic substances, a carbohydrate-degrading microorganism supply tank for storing carbohydrate-degrading microorganisms that decompose carbohydrate- And a fat-decomposing microorganism supply tank for storing fat-decomposing microorganisms.

The sludge aspect analyzing means analyzes sludge supplied to the microorganism contact tank and the kind and content of organic matter contained in the sludge. The microbial supply control means may further comprise a microbial supply control means for controlling the microbial supply control means based on the type and content of the organic substances contained in the sludge as a result of analysis of the sludge property by the sludge aspect analyzing means, The decomposition microorganism supply tank and the lipolytic microorganism supply tank to control the supply of the microorganisms corresponding to the content of each organic material to the microorganism mixing tank.

The specific microorganism put into the microorganism contact tank is 0.5 to 2 wt% of the volatile suspended material of the sludge. The dissolved oxygen concentration in the microbial contact tank is 3.0 to 4.0 mg / L. The separation bioreactor may be any one of a membrane bio-reactor (MBR), a floating separation tank, a centrifugal separation tank, and a gravity settling tank.

The deodorizing and microbial activation device is supplied with the deodorant collected in the microbial contact tank, the sludge oxidation tank, and the separation bioreactor, and the deodorizing and microbial activation device is supplied to the deodorizing and microbial activation device by the bio- Lt; / RTI > In addition, a mineral supply tank is further provided. The mineral supply tank activates microorganisms in the waste sludge by supplying minerals to the deodorizing and microbial activation device, and supplies minerals to the microbial mixing tank, .

The method for treating sewage sludge using specific microorganisms according to the present invention comprises the steps of preparing microorganisms by blending microorganisms decomposing specific organic matter in accordance with the kind and content of organic matter contained in the sludge; Fermenting the sludge by bringing the specific microorganism into contact with the sludge under exhalation conditions; Disassembling and decomposing the fermented sludge under aerobic conditions through the action of specific microorganisms; Separating the sludge having undergone the decomposition process into a supernatant liquid and a waste sludge; And supplying minerals to the waste sludge to activate microorganisms in the waste sludge to return the waste sludge to the sludge decomposition process.

The specific microorganism may be any one of a proteolytic microorganism, a carbohydrate-degrading microorganism, and a lipolytic microorganism, or a combination thereof. The compounding ratio of the microorganisms constituting the specific microorganism may correspond to the compounding ratio of the organic substances contained in the sludge.

The apparatus and method for treating sewage sludge using specific microorganisms according to the present invention have the following effects.

According to the characteristics of the sludge, it is possible to improve the sludge decomposition efficiency by constructing specific microorganisms corresponding to the types and contents of the organic substances contained in the sludge. In addition, odors generated in the sludge treatment process are captured and filtered through the biofilter, thereby effectively removing odor causing substances.

1 is a schematic view of a sewage sludge treatment apparatus using a specific microorganism according to an embodiment of the present invention.

The present invention discloses a technique for decomposing sludge by combining a sludge treatment process through aerobic digestion with a deodorization process using a biofilter and removing odor inducing substances contained in the sludge. In addition, the present invention is characterized in that the microorganisms required for aerobic digestion are applied, and the optimum microorganisms are added in accordance with the characteristics of the sludge to be treated, thereby improving the sludge decomposition efficiency.

The characteristics of the sludge refers to the characteristics of the organic matter contained in the sludge. The organic matter contained in the sludge can be largely divided into a protein system, a carbohydrate system and a fatty system. It is characterized in that aerobic digestion of sludge proceeds by combining microorganisms, carbohydrate-degrading microorganisms, and lipolytic microorganisms. In the present invention, the term 'specific microorganism' refers to any one of a proteolytic microorganism, a carbohydrate-degrading microorganism, and a lipolytic microorganism or a combination thereof. Hereinafter, an apparatus and method for treating sewage sludge using specific microorganisms according to an embodiment of the present invention will be described in detail with reference to the drawings.

1, the apparatus for treating sewage sludge using specific microorganisms according to an embodiment of the present invention includes a microorganism supply tank 110, a microorganism mixing tank 120, a microorganism contact tank 130, a sludge oxidation tank 140, A separation bioreactor 150, and a deodorizing and microbial activation device 160.

The microorganism supply tank 110 serves to store and supply microorganisms having decomposition characteristics for specific organic substances. A plurality of such microorganism supply tanks 110 are provided, and microorganisms having different decomposition characteristics for different microorganisms are stored in the respective microorganism supply tanks 110. In one embodiment, the plurality of microorganism supply tanks 110 include a microorganism supply tank 111 for storing proteolytic microorganisms that decompose protein-based organisms, a microorganism supply tank for storing carbohydrate-degrading microorganisms that decompose carbohydrate- 112), and a microorganism supply tank 113 for storing fat-decomposing microorganisms that decompose the fatty organic matter.

The microbial mixing tank 120 serves to mix and supply the microorganisms stored in the plurality of microbial supply tanks 110. Specific microorganisms are produced by mixing the microorganisms in the microorganism mixing tank 120, and one or more kinds of microorganisms are mixed with the specific microorganisms. Specific microorganisms mixed with one or more kinds of microorganisms are used for decomposing sludge. Depending on the characteristics of the sludge, kinds and composition ratios of microorganisms constituting specific microorganisms are adjusted. Specifically, when the organic matter contained in the sludge is protein-based, the proteolytic microorganism becomes the main microorganism of the specific microorganism. In the case of the carbohydrate-based organic matter, in the case of the carbohydrate-degrading microorganism or the fatty organic material, do. Also, when the organic matter contained in the sludge is a mixture of protein, carbohydrate, and fatty acid, the microorganism may be composed of a mixture of proteolytic microorganisms, carbohydrate-degrading microorganisms, and lipolytic microorganisms in accordance with each organic material.

The specific microorganism should be added in an amount of 0.5 to 2 wt% based on the volatile suspended solids (VSS) of the sludge. The volatile suspended solids of sludge are substances that volatilize during the calcination of sludge, which means substantially organic matter in the sludge. When a specific microorganism is added in an amount of 0.5 wt% or less of the sludge volatile suspended solids, the fermentation and decomposition effects of the sludge are insignificant , And when it is 2 wt% or more, the fermentation and decomposition effects of the sludge are not increased any more.

The sludge aspect analyzing means 220 and the microbial supply controlling means 210 may be further provided for analyzing the characteristics of the sludge and manufacturing specific microorganisms according to the characteristics of the sludge. The sludge aspect analyzing means 220 analyzes sludge supplied to the microbial contact tank 130, which will be described later, on the types of organic substances contained in the sludge. The sludge analyzing means 220 analyzes the types of organic substances contained in the sludge, Analyze the content.

Protein-based organic compounds can be analyzed by the Lowry method and the BCA method. For example, bovine serum albumin (BSA) can be used as a reference reagent to analyze the absorbance at 750 and 562 nm wavelengths, respectively , And carbohydrate-based organic compounds can be analyzed by Dubois method and Anthrone method. For example, glucose can be analyzed using a colorimetric method measuring absorbance at 490 and 625 nm wavelengths as reference reagents, In the case of fatty organic materials, the amount of fat is analyzed by eluting (1 hour boiling + 2 hours rinse) in an organic solvent such as hexane using a Soxhlet extractor and measuring the weight, or in case of volatile fatty acid (VFA) Can be analyzed by gas chromatographic analysis. The analysis apparatuses for the respective organic substances as described above may be individually provided to constitute the sludge aspect analyzing means 220 or to analyze the organic matter through one sludge aspect analyzing means 220.

The microbial supply control means 210 controls the microbial feedstock supply tank 111, the carbohydrate disintegration tank 210, and the microbial feedstock supply tank 210 based on the sludge property analysis result by the sludge aspect analyzing means 220, The microorganism supply tank 112 and the lipolytic microorganism supply tank 113 to control the microorganisms to be supplied to the microorganism mixing tank 120 in accordance with the content of each organic material.

The microorganism contact tank 130 serves to bring the specific microorganism produced by the microorganism mixing tank 120 into contact with the sludge and induce fermentation of the sludge through contact between the microorganism and the sludge. The microorganism contact tank 130 is operated under an aerobic condition, and the dissolved oxygen of the microorganism contact tank 130 is preferably operated at 3.0 to 4.0 mg / L in order to optimize sludge fermentation. The sludge supplied to the microorganism contact tank 130 may be sludge discharged from the sewage treatment apparatus.

In addition, the microorganism contact tank 130 may be composed of three unit tanks arranged in series adjacent to each other in detail, and the sludge may sequentially pass through three unit tanks, thereby doubling the fermentation of the sludge.

The sludge oxidation tank 140 receives the sludge fermented from the microorganism contact tank 130 and disassembles and disassembles the sludge. The sludge oxidation tank 140 is operated under an aerobic condition similar to the microbial contact tank 130 and has a relatively high dissolved oxygen concentration in comparison with the microorganism contact tank 130 for decomposing sludge and decomposing organic matter. For example, 5.0 to 6.0 mg / L) and inject air with a relatively strong wind speed. In addition, the sludge oxidation tank 140 is composed of three unit tanks arranged in series in the same manner as the microbial contact tank 130, thereby increasing the rate of decomposition of organic matter in the sludge.

The sludge discharged from the sludge oxidation tank 140, that is, the sludge decomposed with organic matter, is supplied to the separation bioreactor 150, and the sludge is separated into solid and liquid in the separation bioreactor 150. The solid-liquid separated supernatant can be returned to the sewage treatment apparatus, and the solid-liquid separated waste sludge, that is, the sludge from which the organic matter is removed, is supplied to the deodorizing and microbial activation unit 160. The separation bioreactor 150 may be configured in various forms provided that it performs the function of solid-liquid separation. In one embodiment, the separation bioreactor 150 may comprise a membrane bio-reactor, a floatation separator, a centrifuge separator, and a gravity settler.

The deodorizing and microbial activation device 160 activates the microorganisms in the waste sludge by mixing the minerals with the waste sludge supplied from the separated bioreactor 150 and supplies sludge containing the activated microorganisms to the sludge oxidation tank 140, As shown in FIG. The deodorizing and microbial activating device 160 is provided with an air containing odor absorbing substances collected in the microorganism contact tank 130, the sludge oxidizing tank 140 and the separated bioreactor 150 The deodorizing and microbial activation device 160 filters the odor causing substance.

The minerals supplied to the deodorizing and microbial activation device 160 are supplied from a mineral supply tank 170. The minerals in the mineral supply tank 170 are also supplied to the microbial mixing tank 120, can do.

110: microorganism supply tank
111: proteolytic microorganism supply tank
112: carbohydrate-degrading microorganism supply tank
113: lipolytic microorganism supply tank
120: Microorganism mixing tank 130: Microorganism contact tank
140: sludge oxidation tank 150: separation bioreactor
160: Deodorization and microbial activation device 170: Mineral supply tank
210: Microorganism supply control means 220: Sludge property analysis means

Claims (11)

A plurality of microorganism supply tanks for storing and supplying different kinds of organic decomposition microorganisms;
A microorganism mixing tank for mixing microorganisms supplied from the plurality of microorganism supply tanks to produce specific microorganisms;
A microorganism contact tank for fermenting the sludge by bringing the specific microorganism into contact with the sludge under aerobic conditions;
A sludge oxidation tank for receiving sludge fermented from the microorganism contact tank and disassembling and decomposing the sludge under the aerobic condition through the action of specific microorganisms;
A separation bioreactor for solid-liquid separation of the sludge supplied from the sludge oxidation tank; And
And a deodorizing and microbial activating device for mixing the minerals in the waste sludge discharged from the separated bioreactor to activate the microorganisms in the waste sludge and returning the sludge containing the activated microorganisms to the sludge oxidizing tank. Sewage sludge treatment system using microorganisms.
The microorganism supply tank according to claim 1,
A carbohydrate-degrading microorganism supply tank for storing a carbohydrate-degrading microorganism for decomposing carbohydrate-based organic matter; a fat-storing microorganism for decomposing a fatty-based organic material; And a decomposition microorganism supply tank. The apparatus for treating sewage sludge using specific microorganisms according to claim 1,
The apparatus according to claim 1, further comprising sludge-
Wherein the sludge aspect analyzing means analyzes sludge supplied to the microorganism contact tank and the kind and content of organic matter contained in the sludge.
4. The microorganism according to claim 3, further comprising a microbial supply control means,
The microbial supply control means controls the microbial feeder, the carbohydrate-degrading microbial feed tank, and the lipolytic microbial feed tank, based on the type and content of the organic substances contained in the sludge, which is the sludge profile analysis result of the sludge- And controlling the microbes to be supplied to the microbial mixing tank in accordance with the content of each organic substance.
The apparatus for treating sewage sludge using microorganisms according to claim 1, wherein the specific microorganism introduced into the microorganism contact tank is 0.5 to 2 wt% of the volatile suspended solids of the sludge.
The sewage sludge treatment system according to claim 1, wherein the microorganism contact tank has a dissolved oxygen concentration of 3.0 to 4.0 mg / L.
The method according to claim 1, wherein the deodorizing and microbial activation device is supplied with the collected odor in the microorganism contact tank, the sludge oxidizing tank and the separated bioreactor,
Wherein the odor causing substance in the odor absorbing substance is filtered by the bio filter provided in the deodorizing and microbial activation device.
The method according to claim 1, further comprising a mineral supply tank,
Wherein the mineral supply tank supplies minerals to the deodorizing and microbial activation device to activate the microorganisms in the waste sludge and to supply minerals to the microbial mixing tank to induce the activity of specific microorganisms. Sludge treatment device.
[2] The apparatus for treating sewage sludge according to claim 1, wherein the separation bioreactor is one of a membrane bio-reactor, a floating separation tank, a centrifugal separation tank, and a gravity sedimentation tank.
Preparing a specific microorganism by blending microorganisms decomposing a specific organic material in accordance with the kind and content of the organic material contained in the sludge;
Fermenting the sludge by bringing the specific microorganism into contact with the sludge under exhalation conditions;
Disassembling and decomposing the fermented sludge under aerobic conditions through the action of specific microorganisms;
Separating the sludge having undergone the decomposition process into a supernatant liquid and a waste sludge; And
And supplying minerals to the waste sludge to activate the microorganisms in the waste sludge to return the waste sludge to the sludge decomposition process.
[Claim 11] The method according to claim 10, wherein the specific microorganism is any one of proteolytic microorganisms, carbohydrate-degrading microorganisms, and lipolytic microorganisms, or a combination thereof, wherein the compounding ratio of the microorganisms constituting the specific microorganism depends on the compounding ratio of the organic substances contained in the sludge Wherein the microorganism is a microorganism.

Images