KR101044742B1 - Biofilter system equipped with fixed bed aeration reactor - Google Patents

Abstract

The present invention discloses a biofilter system incorporating a fixed counseling aeration reactor. The odor removing biofilter system includes a pretreatment unit including a spray nozzle, a circulation water storage tank, a chemical storage tank, and a chemical supply pump, a odor gas transfer unit including an inflow load distribution valve, a porous carrier layer, and a fixed bed carrier aeration reaction tank. And a biofilter body including a fixed bed carrier layer, a temperature control device, and a biofilter unit including a constant circulation spray nozzle and a concentrated nutrient storage tank, a concentrated nutrient supply pump, a tap water supply device, a diluted nutrient storage tank and a diluted nutrient supply It includes a pump.

Description

Biofilter system incorporating fixed-bed carrier aeration reactor {BIOFILTER SYSTEM EQUIPPED WITH FIXED BED AERATION REACTOR}

The present invention relates to a biofilter system incorporating a fixed bed carrier aeration reactor, and more particularly, to a biofilter system incorporating a fixed bed carrier aeration reactor for removing odor gas and volatile organic compounds (VOC).

 Recently, various methods for removing odors and volatile organic compounds generated from various industrial facilities such as chemical plants, oil refineries, and coating facilities, and environmental infrastructure such as sewage treatment plants and industrial waste treatment plants have been studied and carried out.

Conventionally, various kinds of physical and chemical methods such as activated carbon adsorption, cooling condensation, catalytic combustion, direct combustion, and chemical liquid cleaning have been mainly used as a method for removing odors and volatile organic compounds. However, these methods had disadvantages such as excessive operating costs, risks such as fire, and fear of generation of secondary pollutants.

Therefore, in recent years, as a means to solve these shortcomings, biofilter technology, which is an eco-friendly technology, has been developed and spread, and the application of such technology is gradually widening.

One type of biofilter technology is a microbial deodorization filter. Microbial deodorization filters were first proposed in 1923 to control odors in sewage treatment plants, and their use began in the 1950s when soil filter technology was introduced into sewage treatment plants in the United States. In the 1960s, soil deodorization technology was introduced to Europe and applied to the treatment of odors in sewage treatment plants and odors in compost production facilities. In the 1970s, compost instead of soil began to be used as a carrier for deodorization filters, and actual field installations began in earnest, mainly in Germany, and biofilters with pH control made by mixing shellfish or slaked lime with compost were proposed. In the 1980s, as regulations on air pollution and odor pollution were tightened in Europe such as Germany, the construction of microbial deodorization filter began to increase significantly. In addition, when processing low concentration odor gas, carrier-filled biofilter turned out to be competitive in price compared to the existing physical and chemical treatment technologies, and research and development efforts were rapidly increased, and new carriers were introduced.

In Korean Patent No. 10-267632, the concentration is first lowered by a buffer such as activated carbon for the purpose of processing more than 90% of odor and overall volatile substances, and pretreatment of odor and volatile substances by cooling or heating system or humidifier. In addition, a method using a fan using a pressure difference to continuously supply pretreated malodors and volatiles is described, and a method of removing malodors and volatiles by passing through a filter including a microbial carrier is described.

In addition, Korean Patent No. 10-0846979 discloses a method of removing odorous substances by using a crab shell as a carrier, and Korean Patent Publication No. 2000-60699 discloses a net, porous material, carbon filter and An apparatus for removing odor and volatile organic compounds including a nozzle for spraying a solution in which a microorganism is cultured downward is described. Korean Patent No. 10-0781777 discloses a carrier layer composed of several layers, a circulating water supply device, and a nutrient supply. It is described with respect to a biofilter including a device for.

However, the conventional biofilter technology has difficulty in its application due to the following problems.

According to the conventional biofilter technology, when the incoming malodorous substance is introduced into the inorganic malodor and the organic malodor at the same time there is a problem that the microorganisms inhabit the carrier layer of the biofilter does not effectively remove the inorganic malodor. In addition, when the high concentration of malodorous gas flowing into the biofilter is maintained, the biofilter carrier layer has a concentration gradient with respect to the inflowing malodorous substance, so that the load is concentrated on the lowermost layer of the carrier layer. Therefore, there is a problem that causes pressure loss and drift phenomenon.

Finally, since the biofilter is a treatment facility by microorganisms, the treatment of the incoming malodorous substances is dependent on the carrier layer. However, since the capacity of the carrier layer is limited, the size of the carrier layer should be increased in the place where high concentration of malodorous gas is introduced. Had problems.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, to provide a biofilter system for removing odor, which further includes facilities such as a pretreatment unit of a chemical liquid cleaning method, a biofilter inlet load distribution valve, and a fixed bed carrier aeration reactor. The purpose is.

In order to solve the above object, the odor removing biofilter system according to an embodiment of the present invention comprises a pre-treatment (Quencher); Odor gas delivery unit; Bio filter unit; And a high nutrient reservoir, a high nutrient feed pump, a tap water supply for diluting nutrients, a dilute nutrient reservoir, and a dilute nutrient supply pump.

The pretreatment unit may include a circulating water spray nozzle for injecting circulating water into the porous contact carrier and the porous contact carrier, a circulating water storage tank for storing the circulating water in the lower part of the pretreatment unit, an oxidizing agent in the circulating water of the pretreatment unit, or Chemical reservoirs and chemical feed pumps for supplying neutralizers.

The malodorous gas transfer unit is connected to the main body of the pretreatment unit, and includes an inflow load distribution valve for transferring the malodorous gas that has passed through the pretreatment unit to the biofilter.

The biofilter unit includes a porous carrier layer in which microorganisms live, a stationary bed carrier aeration reaction tank, a stationary bed carrier layer installed below the stationary carrier aeration reaction tank, and a temperature control device for controlling a temperature of the aeration reaction tank liquid. And a constant circulation spray nozzle connected to the fixed bed carrier aeration reaction tank and circulating the aeration reaction liquid to the upper and lower portions of the porous carrier layer and connected to the odor gas delivery unit by a duct.

The high concentration nutrient storage tank, high concentration nutrient supply pump, tap water supply device for nutrient dilution, dilution nutrient storage tank, and dilution nutrient supply pump adjust the pH of the biofilter aeration reaction tank liquid and the porous carrier layer and the stationary phase carrier of the biofilter body part Provide nutrients to the microorganisms present in the layers.

In addition, the inflow load distribution valve may include a controller to control the opening and closing according to the signal of the pressure gauge installed under the biofilter.

The temperature control device may use steam or electricity as a heat source.

The material of the fixed bed carrier layer located in the fixed bed carrier aeration reaction tank may be made of one or a mixture of two or more selected from polyethylene, polypropylene, polyester or polyvinylidene chloride.

The fixed bed carrier aeration reaction tank may include an acid engine and an oxygen supply blower to supply oxygen to the microorganisms present in the fixed bed carrier layer of the fixed bed carrier aeration reaction tank.

The biofilter unit may include a diluent nutrient supply spray nozzle for supplying the diluted nutrient to the upper carrier layer.

The diluent spray nozzle may include a solenoid valve to supply nutrients to the microorganisms according to a predetermined time.

According to the biofilter system incorporating the fixed bed carrier aeration reaction tank according to the present invention, the odor can be more effectively and reliably removed by having a pretreatment facility including a pretreatment unit and a valve device for inflow load distribution.

In addition, by installing a fixed bed carrier aeration reaction tank in the lower portion of the biofilter body, it is possible to design a small volume of the biofilter carrier layer to reduce the installation cost of the biofilter system.

Hereinafter, a biofilter system incorporating the fixed bed carrier aeration reactor according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a view schematically illustrating a structure of a biofilter system in which a fixed bed carrier aeration reaction tank having a pretreatment unit (Quencher) for pretreatment of an inorganic malodorous substance according to an embodiment of the present invention is incorporated.

Referring to Figure 1, the biofilter system according to an embodiment of the present invention is a pre-treatment (Quencher), odor gas transfer unit, bio-filter unit, high concentration nutrient storage tank 26, high concentration nutrient supply pump 25, nutrient dilution A tap water supply device 21, a diluted nutrient reservoir 24, and a diluted nutrient supply pump 23.

The pretreatment unit (Quencher) includes a blower (2) for transferring contaminated air from the volatile organic compound (VOC: Volatile Organic Compound) through the malodor gas inlet (1) to the inorganic malodor pretreatment unit main body (3) Chemical storage tank for supplying oxidizing agent / neutralizer to conveying unit, porous contact carrier (4), circulating water tank storage tank (5), pretreatment tank circulation pump (7), circulating water spray nozzle (6), and pretreatment (Quencher) 8), a chemical supply pump 9 for supplying chemicals, and an odor gas outlet installed at the top.

Acidic chemicals are used for basic malodorous gases (ammonia, amines) as the chemicals, acidic gases (hydrogen sulfide, mercaptans) are neutralized with basic chemicals and removed in the form of salt compounds, and sodium hypochlorite (NaOCl, if necessary). ), Hypochlorous acid (HCLO), hydrogen peroxide (H2O2), potassium permanganate (KMnO4) and the like can be used.

An inflow load distribution valve 10 is installed in the malodorous gas conveying unit which delivers the malodorous gas that has passed through the pretreatment unit to the biofilter. As shown in Figure 1, the duct exiting the outlet of the pre-treatment (Quencher) is configured to be connected between each carrier layer of the biofilter. As the concentration of odorous substances increases, the inflow load increases, the load is concentrated in the lowermost layer, and the growth of microorganisms in the lowermost layer increases pressure loss. Therefore, in order to prevent this, the inlet load distribution valve 10 was configured as a separate duct and a valve so as to distribute the load by directly inflowing the biofilter inlet gas into the upper layer carrier when the pressure exceeds the predetermined pressure. In addition, the odor removal biofilter system according to an embodiment of the present invention includes a controller for controlling the opening and closing of the inflow load distribution valve in accordance with the signal of the pressure gauge installed under the biofilter. Therefore, when the differential pressure of the lowermost part and the uppermost part of the biofilter is 150 mmH2O or more, the pressure loss problem is solved by opening the inflow load distribution valve.

Referring to FIG. 1, the biofilter unit has a porous carrier layer 18 and 19, a fixed bed carrier aeration reactor 13 disposed under the biofilter body, and a constant circulation spray nozzle 12 connected to the fixed bed carrier aeration reactor 12. ), A biofilter circulation pump 17, and a temperature control device 16 for controlling the temperature of the aeration reaction liquid.

The porous carrier layers 18 and 19 are composed of an upper carrier 18 and a lower carrier 19, and microorganisms that remove odorous substances are inhabited.

The fixed bed carrier aeration reaction tank 13 is installed in the water storage tank under the biofilter main body, and has an integrated structure with the biofilter. The fixed bed carrier aeration tank 14, the oxygen supply blower 11, and the diffuser pipe 15 are provided. Can be configured.

The role of the fixed bed carrier layer 14 mounted on the fixed bed carrier aeration reactor 13 is to supply the microorganisms with moisture, nutrients, and pH buffering functions, and treat organic odorous substances dissolved in water on the same principle as in the wastewater treatment plant. It is. As the material of the stationary phase carrier layer 14, one made of one or a mixture of two or more selected from the group consisting of polyethylene, polypropylene, polyester and polyvinylidene chloride can be used.

The biofilter circulating pump 17 supplies nutrients and moisture to the fixed bed carrier layer 14 of the fixed bed carrier aeration reaction tank 13, and serves to adsorb soluble odorous substances of the inlet gas. 12) circulates the aeration reaction bath liquid to the upper and lower portions of the porous carrier layers (18, 19) by the biofilter circulation pump (17).

In addition, the temperature control device 16 serves to maintain the proper temperature of the aeration reaction bath liquid in winter, and may use electricity or steam as the heat source.

In addition, the biofilter system incorporating the fixed bed carrier aeration reaction tank according to an embodiment of the present invention is a high concentration nutrient storage tank 26, high concentration nutrient supply pump 25 in addition to the pre-treatment (Quencher), odor gas transfer unit, bio filter unit. It may include a tap water supply 21, a dilution nutrient reservoir 24, a dilution nutrient supply pump 23, a dilution nutrient supply spray nozzle 20, and a solenoid valve (22).

The tap water supply device 21 is for diluting the nutrients, whereby the nutrients of the high concentration nutrient storage tank 26 and the tap water are mixed in a predetermined ratio. The diluted nutrient is supplied to the microorganism by the diluent reservoir 24 and the diluent feed pump 23, and is injected into the porous carrier layers 18, 19 through the diluent feed spray nozzle 20 at the top. The dilution nutrient injection through the dilution nutrient supply spray nozzle 20 supplies nutrients such as nitrogen and phosphorus to the volatile organic compound (VOC) removal microorganisms that inhabit the porous carrier layers 18 and 19. It is to. In addition, a nutrient may be injected into the porous carrier layers 18 and 19 by using a solenoid valve 22 according to a predetermined supply time.

1 is a view schematically showing the structure of a biofilter system incorporating a fixed bed carrier aeration reaction tank according to an embodiment of the present invention.

<Brief Description of Drawings>

1: odor gas inlet 2: blower

3: pretreatment unit body 4: porous contact carrier

5: circulating water reservoir 6: circulating water spray nozzle

7: Circulating pump with pretreatment 8: Chemical storage tank

9: Chemical supply pump 10: Inlet load distribution valve

11: oxygen supply blower 12: constant circulation spray nozzle

13: process carrier flush reaction tank 14: stationary phase carrier layer

15: diffuser 16: temperature controller

17: biofilter circulation pump 18: lower carrier layer

19: upper carrier layer 20: dilution nutrient supply spray nozzle

21: tap water supply device 22: solenoid valve

23: diluent nutrient supply pump 24: dilution nutrient storage tank

25: high concentration nutrient supply pump 26: high concentration nutrient storage tank

Claims (7)

a) a pretreatment unit body 3, a porous contact carrier 4 installed in the pretreatment unit body 3, a circulating water spray nozzle 6 for spraying circulating water onto the porous contact carrier 4, and the pretreatment Circulating water storage tank 5 for storing the circulating water in the lower part of the main body (3), chemical storage tank (8) and chemical supply pump for supplying oxidizing agent or neutralizing agent to the circulating water of the pretreatment main body (3) A pre-treatment section (9) comprising (9); b) a malodor gas transfer unit connected to the pretreatment unit body 3 and including an inflow load distribution valve 10 for transferring the malodorous gas that has passed through the pretreatment unit to a biofilter unit; c) in the porous carrier layer (18, 19), the fixed bed carrier aeration reaction tank (13), the fixed bed carrier aeration reaction tank (13) installed below the fixed bed carrier aeration reaction tank (13), and the fixed bed carrier aeration reaction tank (13). The biofilter body part including a thermostat device 16 for controlling the temperature of the liquid contained therein, and the liquid contained in the fixed bed carrier aeration reactor 13 and connected to the fixed bed carrier aeration reactor 13 may contain the porous carrier layer. A biofilter unit including a circulating spray nozzle 12 which circulates to the upper and lower portions of the upper and lower parts of 18 and 19 and connected to the odor gas transfer unit by a duct; And d) for adjusting the pH of the liquid contained in the fixed bed carrier aeration reaction tank 13 of the biofilter part and providing nutrients to the microorganisms present in the porous carrier layers 18 and 19 and the fixed bed carrier layer 14 of the biofilter body part; A high concentration nutrient storage tank 26, a high concentration nutrient supply pump 25, a tap water supply device 21 for nutrient dilution, a dilution nutrient storage tank 24, and a dilution nutrient supply pump 23; Odor removal bio-filter system comprising a. The method of claim 1, The inflow load distribution valve (10), odor removal biofilter system, characterized in that it comprises a controller so that the opening and closing can be adjusted according to the signal of the pressure gauge installed under the biofilter. The method of claim 1, The temperature control device 16 increases the temperature by using steam or electricity as a heat source, or lowers the temperature by using a heat exchanger using cooling water. The method of claim 1, The material of the fixed bed carrier layer 14 located in the fixed bed carrier aeration reaction tank 13 is characterized in that it is made of one or a mixture of two or more selected from polyethylene, polypropylene, polyester or polyvinylidene chloride. Odor removal biofilter system. The method of claim 1, The fixed bed carrier aeration reaction tank 13 is characterized in that it comprises an acid pipe 15 and the oxygen supply blower 11 to supply oxygen to the microorganisms present in the fixed bed carrier layer 14 of the fixed bed carrier aeration reaction tank. Odor removal biofilter system. The method of claim 1, The biofilter unit is a odor removing biofilter system, characterized in that it comprises a diluent nutrient supply spray nozzle (20) for supplying the diluted nutrient to the upper carrier layer (19). The method of claim 6, The odor removing biofilter system, characterized in that it comprises a solenoid valve (22) so that nutrients can be supplied to the microorganisms according to a predetermined time through the diluent nutrient supply spray nozzle (20).

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