KR20160081254A - Method and apparatus for reducing sludge of waste water treatment system using complex microbe - Google Patents

Abstract

Disclosed are a method and an apparatus for reducing sludge in a wastewater treatment system using composite microorganisms. According to an embodiment of the present invention, the sludge reduction method comprises the following steps: injecting a predetermined amount of composite microorganisms, which decompose organic matters into sludge generated during a sewage or wastewater treatment process; and decomposing the organic matters included in the sludge through a suitable metabolic period. The injection amount of the composite microorganisms is determined by biochemical oxygen demand (BOD) of wastewater.

Description

Technical Field [0001] The present invention relates to a method and a device for reducing sludge in a sewage treatment plant using a complex microorganism,

The present invention relates to a sludge reduction method and a weight loss apparatus for reducing sludge generated in a sewage treatment plant using a complex microorganism, and more particularly, to a sludge reduction method and a sludge reduction method by controlling the injection amount of a complex microorganism according to a flow rate of an incoming sludge and a BOD loading amount And more particularly, to a sludge reducing method and a weight reducing apparatus capable of increasing efficiency.

In 2013, research on sludge disposal has been proceeding in various ways in accordance with the prohibition of marine dumping on wastewater sludge, and the research on sludge recycling has been mainly carried out. However, the direction of reducing the amount of sludge rather than recycling the sludge will be a solution to the fundamental sludge problem. Among wastewater sludge, livestock wastewater sludge contains organic matter and inorganic matter at a high concentration, and therefore there is a limit in the conventional treatment methods. Sludge treatments using conventional biological methods have been used to inject microorganisms, and processes using EM (Effective Microorganisms) developed in Japan have been applied. However, EM has a disadvantage that it is difficult to expect higher processing efficiency than expected

Korean Patent Publication No. 2012-0075712

SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a sludge treatment method and a treatment apparatus capable of increasing sludge treatment efficiency.

Other objects of the present invention will become more apparent through the embodiments described below.

A method for reducing sludge in a sewage treatment plant using a complex microorganism according to one aspect of the present invention includes the steps of putting a complex microorganism having a property of decomposing organic matter into a sludge generated in a sewage or wastewater treatment process, And the amount of the combined microorganism is determined according to the BOD of the wastewater.

The method for reducing sludge in a sewage treatment plant according to the present invention may include one or more of the following embodiments. For example, when the BOD of the wastewater is less than 1,000 mg / l, the amount of the combined microorganisms to the wastewater flow is 1/100, 5,000 mg / l to 5,000 mg / If the concentration is less than 10,000 mg / l, the amount of combined microorganism to the wastewater flow rate is 1/50, and if the amount is more than 10,000 mg / l, the amount of combined microorganism to the wastewater flow rate may be 1/10.

Diluting the mixed microorganism stock with water, adding oxygen and molasses to the diluted mixed microorganism, adjusting temperature, culturing the mixed microorganism while stirring to prevent precipitation and uniform mixing, mixing the mixed microorganism with sludge Mixing the mixed microorganisms and the sludge mixed at a uniform concentration into a storage tank or a separate storage tank or digestion tank; and adding the mixed microorganism and the sludge to a storage tank or a separate digestion tank, And maintaining the sludge at a constant temperature for the purpose of promoting the metabolism, and reducing the sludge while stirring and supplying oxygen.

In the step of culturing the complex microorganism, the oxygen dose is 1 mg / l and the temperature can be maintained at about 25 캜.

The apparatus for reducing sludge using complex microorganisms according to one aspect of the present invention comprises a culture apparatus for culturing a complex microorganism and a culture tank agitation apparatus for preventing precipitation of materials injected for culturing complex microorganisms in a culture apparatus and mixing the same at a constant concentration A mixing tank in which the cultured complex microorganisms and the sludge are introduced, a mixing tank stirring device for preventing precipitation in the mixing tank and mixing the same at a constant concentration, and a mixing tank for feeding the complex microorganism and the sludge to a storage tank or a separate storage tank or digester A temperature control device installed in the storage tank or the separate storage tank or the digestion tank into which the complex microorganisms and the sludge have been introduced and kept at a constant temperature and the storage tank or the separate storage tank or the digester having the complex microorganism and the sludge charged therein, A stirring device for stirring and a device for accelerating the metabolism of the complex microorganism A culture tank stirring apparatus, a mixing tank stirring apparatus, a feeding apparatus, a temperature adjusting apparatus, a tank stirring apparatus, and an air feeding apparatus are provided in the storage tank or the separate storage tank or the digestion tank, , And the amount of the combined microorganisms is determined according to the BOD of the wastewater.

The sludge reducing apparatus according to the present invention may be provided with one or more of the following features. For example, the apparatus may further include a sludge measuring device for measuring the amount and concentration of the cultured complex microorganisms and the sludge introduced into the mixing tank, and providing the integrated sludge to the integrated control device.

The present invention can provide a sludge weight reduction method and a weight loss apparatus capable of increasing treatment efficiency of sludge generated in a sewage treatment plant.

1 is a block diagram illustrating a sludge reduction apparatus using a complex microorganism according to an embodiment of the present invention.
2 is a diagram illustrating a specific configuration of a storage tank in the sludge weight reduction apparatus illustrated in FIG.
3 is a flowchart illustrating a method of reducing sludge using a complex microorganism according to an embodiment of the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and will be described in detail in the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout the specification and claims. The description will be omitted.

FIG. 1 is a block diagram illustrating a sludge weight reduction apparatus 100 using a complex microorganism according to a first embodiment of the present invention. FIG. 2 is a schematic view of a sludge weight reduction apparatus 100 shown in FIG. 1, And FIG.

The present invention relates to a method for preparing a microorganism, which comprises orienting a complex microorganism under appropriate conditions to maximize the activity of a complex microorganism and then uniformly mixing a certain amount of complex microorganisms according to the amount and concentration of sludge generated in a sewage or wastewater treatment plant, The sludge is introduced into the storage tank 190 or the existing digestion tank 195 for a predetermined period of time and the complex microorganisms decompose the organic matter of the sludge to thereby reduce the amount of the sludge. At this time, an air injector 160 for supplying oxygen to the bottom or side of the tank is installed in the tank (storage tank 170, separate storage tank 190 or digestion tank 195) for promoting metabolism of the complex microorganism, Oxygen is supplied and a coarse agitating device 180 is provided to prevent precipitation and to maintain a uniform concentration in the tank and a temperature control device 179 is provided to maintain a constant temperature in the tank. Further, in order to increase the treatment efficiency of the sludge, the input amount of the complex microorganisms is adjusted according to the BOD of the wastewater.

1 and 2, a sludge losing device 100 according to a first embodiment of the present invention includes a mixing tank 110, a culture tank 120, a microorganism input device 130, an integrated control device 140 A mixing tank stirring device 150, an air injecting device 160, a feeding device 177, and a tank stirring device 180.

The sludge generated in the first settling tank and the final settling tank in the sewage or wastewater treatment plant process flows into the mixing tank 165 and the mixed microorganisms are introduced into the mixing tank 165 by the microorganism input device 130 in a certain amount. In the mixing tank 165, the sludge and the mixed microorganism are mixed at a uniform concentration by the mixing bath stirring apparatus 150 controlled by the integrated controller 140.

The air injector 160 supplies oxygen to the inside of the storage tank 170 and the bath stirring device 180 stirs the inside of the storage tank 170 so that the complex microorganisms can efficiently decompose the organic matter of the sludge.

The complex microorganism used for the reduction of sludge may be a microorganism preparation according to the method disclosed in Korean Patent No. 0664730, but is not limited thereto. The complex microorganisms used for the sludge reduction include Bacillus-subtilus KS-3, Bacillus-amyloliquefaciens KS-4, Bacillus-agaradhaerens, KS-5, Peanibacillus-lentimorbus KS-6, Bacillus-laevolacticus KS-7, Leuconostoc paramesenteroides KS-9, Selected from the group consisting of Kurthia-sibirica KS-13 and Sphingobacterium spiritiorum-GC subgroup B (Flavobacterium) GC subgroup B (Flavobacterium KS-18) ≪ / RTI > microbial agents.

The microorganism stock solution of the complex microorganism is mixed with water in the mixing tank 110 and then flows into the culture apparatus 120.

The culture apparatus 120 includes a culture tank (not shown) in which the complex microorganisms diluted in the mixing tank 110 can stay for a predetermined time. The culture apparatus 120 includes an oxygen injector 124 for injecting a predetermined amount of oxygen into the culture tank, a molasses injector 126 for injecting molasses into the culture vessel, And a temperature control device 122. As described above, oxygen and molasses are supplied from the inside of the culture apparatus 120, and the temperature is appropriately maintained, so that the complex microorganism is cultured. Further, the culture apparatus 120 is agitated by the culture tank agitator 128.

The amount of oxygen injected by the oxygen injector 124 is determined by the control signal of the integrated controller 140 to match 1 mg / L, which is the amount of oxygen required by most microorganisms. And the temperature regulator 122 can maintain the temperature inside the culture tank at 25 占 폚.

The agitation intensity and time of the culture tank agitator 128 are determined by the control signal of the integrated controller 140.

The culture medium of the complex microorganism is prepared by varying the dilution factor depending on the flow rate and the BOD concentration of the raw water flowing in the sewage or wastewater treatment process. When the pollutant load is high, the microorganism is produced by lowering the dilution drainage. When the concentration is low, the dilution ratio is increased to prepare a complex microorganism. Hybrid microorganisms can be diluted up to 50 times according to dilution multiples, and they are prepared by adding 0.2L of complex microorganism to 9.8L of water at 10L standard. And the molasses is injected daily into the culture apparatus 120 in an amount corresponding to 0.2% of the combined microorganisms.

In the inside of the culture apparatus 120, it is controlled under the control of the integrated controller 140 to control the dilution drainage of the complex microorganism, the amount of molasses and oxygen to be introduced, the temperature and the stirring intensity.

The mixed microorganisms cultured by the culture apparatus 120 and the sludge generated in the sewage or wastewater treatment process are introduced into the mixing tank 165 for uniform mixing and mixed at a uniform concentration by the mixing tank stirring apparatus 150 . The microorganism dosing device 130 can control the amount of the mixed microorganisms to be injected according to the BOD of the incoming wastewater (raw water). The microorganism input device 130 adjusts the amount of microorganisms to be injected into the mixing tank 165 by the control signal of the integrated control device 140.

The mixed microorganisms and the sludge that are uniformly mixed are put into the storage tank 170, and one or more of the mixed microorganisms and the sludge may be formed at the center portion or the side surface of the storage tank 170.

The coarse agitator 180 is provided to prevent sedimentation of the sludge in the storage tank 170 and to provide an environment in which the complex microorganisms can react with the sludge at a uniform concentration. Is determined. The integrated controller 140 controls the agitation intensity of the coarse agitator 180 according to the concentration and amount of mixed mixed microorganisms and sludge flowing into the storage tank 170.

Referring to FIG. 2, it can be seen that the coarse agitating device 180 is formed at the center of the storage tank 170. Of course, the tank stirring apparatus 180 may be formed on the side surface of the storage tank 170.

The stirring gradient (G) (sec ^-1 ) of the coarse agitator 180 is determined by the energy input P (Nm / sec), the volume V of the fluid (m ³ ) , μ) (N sec / m ² ). That is, the stirring strength G corresponds to the square root of P / μV.

Assuming that the agitation strength for preventing sedimentation of sludge and forming a uniform distribution at the time of the time T1 and the factors μ1 and V1 inside the storage tank 170 is G1, a factor at time T2 after a certain time has elapsed is μ2 and V2 In case of a change, the power (P) applied to the agitator needs to be corrected in order to keep the stirring intensity constant. In addition, since the possibility of sedimentation of the sludge is high as the concentration of the sludge flowing into the storage tank 170 increases, the stirring intensity needs to be increased. Such a factor necessitates control of the stirring intensity.

The air injection device 160 supplies oxygen to the inside of the storage tank 170 and is supplied to the inside of the storage tank 170 in response to the amount and concentration of the introduced sludge by the control signal of the integrated control device 140 The amount of oxygen is determined. One or more of the air injectors 160 may be provided on a lower side or a side surface of the tank (storage tank 170). In FIG. 2, a plurality of air injectors 160 are provided below the storage tank 170 As shown in FIG.

In the storage tank 170, the sludge generated in the sewage or wastewater treatment process and the mixed microorganisms are mixed and introduced and then decomposed by the combined microorganisms. The storage tank 170 is provided with a temperature control device 179, a tank stirring device 180, and an air injection device 160 as illustrated in FIG. Therefore, the complex microorganisms and the sludge mixture introduced into the storage tank 170 are decomposed by the complex microorganisms. Such decomposition is controlled by the temperature control device 179, the stirring of the coarse stirrer 180, And is promoted by the oxygen introduced by the device 160.

The coarse feeder 177 feeds the mixed microorganisms and sludge mixed in the mixing tank 165 into the storage tank 170.

The complex microorganism and the sludge mixture introduced into the storage tank 170 are reduced by the complex microorganisms while staying for about 7 days. It is a matter of course that the time of staying in the storage tank 170 may vary depending on the amount and concentration of the complex microorganism and sludge to be introduced.

The amount and concentration of the complex microorganism and the sludge mixture introduced into the storage tank 170 are measured by a sludge measurement device (not shown). The amount and concentration of the sludge measured in the sludge measuring device are transmitted to the integrated controller 140.

The integrated control device 140 is connected to the culture device 120, the microorganism input device 130, the temperature control device 179, the coarse stirring device 180, and the air injection device 160 using signals received from the sludge measurement device. . Therefore, the sludge-losing device 100 according to the present embodiment can control the amount of sludge introduced into the storage tank 170 and the concentration of sludge introduced into the storage tank 170 by controlling the integrated control device 140, It is possible to obtain the maximum reduction efficiency by controlling the injection amount, the constant temperature control by the temperature control device 179, the stirring intensity for mixing the coarse stirring device 180, and the air supply amount of the air injection device 160 do.

The storage tank 170 is generally provided in a sewage or wastewater treatment facility. The storage tank and the sludge generated in the final sedimentation tank are mixed with the mixed microorganism mixture introduced by the microorganism input unit 130 into the storage tank 170 . The sludge introduced into the storage tank 170 is reduced by a complex microorganism having a characteristic of decomposing organic matter.

Table 1 below shows changes in the water quality in the sewage treatment plant after the compound microorganisms are injected into the sludge weight loss apparatus 100 according to the present embodiment. The water quality measurement items in the sewage treatment plant are dms BOD (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand), SS (Suspendid Solid), TN (Total Nitrogen) and TP (Total Phosphrus).

Water Quality Changes in Sewage Treatment Plant after Multiple Microorganism Injection Item
(mg / L) Before compound microorganism injection process
efficiency
(%) After complex microbial infusion process
efficiency
(%) Remarks Before processing After processing Before processing After processing BOD 133.74 ±
103.52 2.95 ±
2.45 97.62 ±
1.79 109.46 ±
44.84 1.25 占
0.71 98.77 ±
0.86 COD 96.92 ±
81.35 8.76 ±
3.51 89.31 ±
3.97 85.13 ±
51.66 6.28 ±
1.16 91.00
3.78 About 2% efficiency increase SS 296.93 ±
490.87 2.69 ±
2.50 97.90 ±
2.70 206.76 ±
297.25 4.53 ±
2.10 96.44 ±
2.38 T-N 32.37 ±
10.10 10.20 ±
6.11 67.06 ±
21.03 26.54 ±
7.72 6.81 ±
3.98 73.82 ±
14.93 Increase efficiency by about 6% T-P 3.85 ±
1.51 1.41 ±
0.46 59.48 ±
15.52 2.79 ±
1.04 0.32 ±
0.13 87.33 ±
7.18 Increased efficiency by about 28%

As shown in Table 1, since the sludge reduction using the complex microorganism shows a tendency similar to the reduction of BOD, in the case of the sludge reduction apparatus according to the present embodiment, 2.

 The amount of complex microorganisms injected according to BOD BOD (mg / L) 1,000 or less 1,000 to 5,000 5,000 to 10,000 10,000 or more Sewage and Livestock Wastewater Injection at 1/500 wastewater flow rate Inject 1/100 of wastewater flow rate Injection at 1/50 of wastewater flow rate Inject 1/10 of wastewater flow rate

According to the mixed microbial feed amount according to Table 2, for example, when the daily wastewater flow rate is 30,000 ton / day and the BOD is 1,000 to 5,000 mg / L, the injection amount of the complex microorganism is 300 ton / day equivalent to 1/100 of the wastewater flow rate . At this time, the complex microorganism can be diluted about 30 times by using tap water or purified water in the undiluted solution.

Although the sludge weight reducing apparatus 100 illustrated in FIG. 1 exemplifies that the sludge is input to the storage tank, the sludge weight reducing apparatus according to another embodiment of the present invention may include a sludge storage tank (not shown) or a digester ). At this time, the storage tank or the digester is provided with a tank stirring device 180 and an air injecting device 160 so that stirring and oxygen supply can be performed.

3 is a flowchart of a sludge reduction method using a complex microorganism according to the present invention.

3, the method for reducing sludge according to the present invention comprises diluting a stock solution of a complex microorganism, culturing the diluted complex microorganism by adjusting the temperature while adding oxygen and molasses thereto, and preventing precipitation and uniform mixing Mixing the mixed microorganisms and the sludge into a mixing tank and mixing the mixed microorganisms and the sludge at a uniform concentration; injecting mixed microorganisms and sludge mixed at a uniform concentration into a storage tank or a separate storage tank or a digester; And reducing the sludge while supplying oxygen to the air injector and stirring while maintaining a constant temperature with the temperature regulator 179 for promoting the metabolism of the complex microorganism in the storage tank or the separate storage tank or the digestion tank. The amount of the combined microorganism is determined according to the BOD of the wastewater.

Dilution of the undiluted solution of the complex microorganism is performed by the mixing tank 110, and the dilution ratio is determined according to the amount and concentration of the introduced sludge.

The step of culturing the complex microorganisms is carried out in the culture apparatus 120 by a control signal of the integrated controller 140. The culture apparatus 120 is connected to a temperature control unit 122, an oxygen injection unit 124 and a molasses injection unit 126. These units are operated by a control signal of the integrated control unit 140.

The cultured complex microorganism is introduced into the mixing tank 165 together with the sludge. Then, the mixing bath stirrer 150 is stirred at a constant stirring intensity by the control signal of the hybrid control unit 140 so that the mixture of the combined microbes and the sludge becomes uniform. The input amount of the complex microorganism is determined according to the BOD of the waste water as shown in Table 2 above.

The uniformly mixed complex microorganisms and the sludge are introduced into the storage tank 170 or the separate storage tank 190 or the digestion tank 195 by the feeding device 177. Then, by the integrated controller 140, the sludge is kept at a constant temperature by the temperature regulating device 179 in the aerobic state inside, and the sludge is agitated by the coarse agitating device 180, and the sludge is reduced and concentrated and dehydrated.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

100: Sludge reduction device
110: mixing tank 120: culture apparatus
122: thermostat 124: oxygen injector
126 molasses injection device 130 microbial input device
140: integrated control device 150: mixing tank stirring device
160: air injection device 170: storage tank
177: feeding device 179: temperature control device
180: tank stirring device 190: storage tank
195: Digester

Claims (6)

A complex microorganism having the characteristic of decomposing organic matter is introduced into the sludge generated in the sewage or wastewater treatment process and a certain amount of organic microorganism is decomposed through proper metabolism period,
A method for reducing sludge in a sewage treatment plant using a complex microorganism wherein the amount of the combined microorganisms is determined according to the BOD of the wastewater. The method according to claim 1,
If the BOD of wastewater is less than 1,000 mg / l, the amount of combined microorganisms to the wastewater flow rate is 1/500. If the wastewater is less than 1,000 mg / l and less than 5,000 mg / l, / l, the mixed microorganism injection amount is 1/50 compared to the wastewater flow rate, and the combined microorganism injection amount is 1/10 relative to the wastewater flow rate when the injection amount is greater than 10,000 mg / l. The method according to any one of claims 1 and 2,
Diluting the mixed microorganism stock solution with water, adding oxygen and molasses to the diluted complex microorganism, adjusting the temperature, preventing the precipitation, and culturing the complex microorganism while stirring for uniform mixing;
Stirring the mixed microorganisms and the sludge into a mixing tank and mixing the same at a uniform concentration;
Introducing the mixed microorganism and sludge mixed at a uniform concentration into a storage tank or a separate storage tank or a digester;
A method for reducing sludge in a sewage treatment plant using a complex microorganism, comprising the steps of maintaining a constant temperature for promoting metabolism of a complex microorganism in a storage tank or a separate storage tank or a digestion tank and supplying oxygen to the sludge while stirring. The method of claim 3,
Wherein the amount of oxygen injected is 1 mg / l and the temperature is 25 캜 in the step of culturing the complex microorganism. A culture apparatus for culturing a complex microorganism;
A culture tank agitating device for preventing sedimentation of materials injected for culturing the complex microorganisms in the culture apparatus and mixing the same at a constant concentration;
A mixing tank in which the cultured complex microorganisms and sludge are introduced, a mixing tank agitator for preventing sedimentation and mixing at a constant concentration in the mixing tank;
A feeding device for feeding the complex microorganism and the sludge into a storage tank or a separate storage tank or digester;
A temperature control device installed in the storage tank or the separate storage tank or the digestion tank into which the complex microorganism and the sludge have been introduced to maintain a constant temperature;
A crude agitation device for agitating the storage tank or the separate storage tank or the digestion tank into which the complex microorganism and the sludge have been introduced, with appropriate strength;
An air injection device for supplying oxygen to the inside of the storage tank or the separate storage tank or the digestion tank to promote the metabolism of the complex microorganism; And
And an integrated control device for controlling the culture apparatus, the culture tank stirring apparatus, the mixing tank stirring apparatus, the feeding apparatus, the temperature adjusting apparatus, the bath stirring apparatus, and the air feeding apparatus,
A sludge reduction device for a sewage treatment plant using complex microorganisms in which the amount of the combined microorganisms is determined according to the BOD of the wastewater. 6. The method of claim 5,
Further comprising a sludge measurement device for measuring the amount and concentration of the cultured complex microorganisms and the sludge introduced into the mixing tank and providing the integrated sludge to the integrated control device.

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