KR101150787B1 - Natural circulation type biofilter deodorinzing device for removing complex malodor - Google Patents

Abstract

PURPOSE: A reaction waste liquid circulating type bio filter-based deodorizing apparatus is provided to reduce the concentration of complex bad odor, foreign materials, and toxic materials from a washing type scrubber by continuously eliminating alkaline bad odor gas. CONSTITUTION: A reaction waste liquid circulating type bio filter-based deodorizing apparatus includes a scrubber(10), a bio-filter(20), and a microorganism cultivating tank(31). A reaction waste liquid circulating pipe is further prepared to re-circulate reaction waste liquid to washing liquid for the scrubber. The bio-filter includes a main body, an inlet(12), an outlet(13), and a reaction waste liquid storing tank. The main body includes a spraying nozzle and a microorganisms carrying layer. The inlet is in connection with the outlet of the scrubber and introduces air containing bad odor reduced moisture. A solid-liquid separator is further included in the bio-filter. The solid-liquid separator is in connection with the reaction waste liquid storing tank. Microorganisms are eliminated from the reaction waste liquid at the solid-liquid separator, and the reaction waste liquid is supplied to a washing liquid storing tank. The separating microorganisms are supplied to the microorganism cultivating tank.

Description

[0001] The present invention relates to a natural circulation type biofilter deodorization apparatus for removing a complex odor,

The present invention relates to a natural circulation-type biofilter deodorizer for removing high-concentration complex odors at a low cost with high efficiency by mixing an acidic solution produced in a biofilter deodorizer with a cleaning liquid of a scrubber which is a pretreatment process.

High concentrations of ammonia, sulfur compounds, fatty acids, amines, hydrocarbons, VOCs, etc. generated from odor sources such as livestock manure treatment plant, food storage and processing plant, sewage treatment plant, byproduct fertilizer production plant, waste drying plant, The conventional methods for collecting and removing air pollutants (odor) substances such as chemical filtration and biofilter deodorization are mainly used. As a method for removing a high concentration of complex odor substances, there are two or more combustion deodorization method and chemical liquid cleaning method A deodorizing method is used in which a deodorizing method is connected in series and a deodorizing method is used in which a deodorizing method is combined with a biofilter deodorizing method.

The chemical liquid cleaning method is advantageous in that the deodorization efficiency is improved to a specific odor substance by a method in which the circulating water diluted with caustic soda or sodium hypochlorite is injected into the reactor inside the deodorization apparatus and brought into contact with the odorous substance, Odorous substances have a low deodorization efficiency, require careful handling of chemical agents, and have a problem of polluting occupational health and hygiene and the surrounding air environment.

Bio-filter deodorization method requires a method to remove odor gas environmentally by microbial adsorption and decomposition mechanism and a humidifying device to supply moisture to a microorganism carrier. In the case of a high-concentration complex odor substance, The microorganisms in the microorganism carrier decompose the acidic gas such as hydrogen sulfide, and the acidic solution such as sulfuric acid is produced. Therefore, the pH of the circulating water is lowered and the microbial metabolism is not affected The operation cost of injecting alkaline solution such as caustic soda and the operation of the medicine metering pump is increased.

The deodorizing method for removing the high concentration of complex odors includes a deodorizing method in which two or more conventional chemical liquid washing methods are connected in series or a method in which a deodorizing method in which a deodorizing method and a biofilter deodorizing method are connected in series, A biofilter deodorization method, or a plant extract biofilter deodorization method in which a plant extract deodorization method and a biofilter deodorization method are directly connected to each other. [Patent Registration No. 10-0963053]

The combustion method uses a direct combustion method that burns odor gas at 800 ° C or more, a regenerative combustion method that increases heat efficiency through heat exchange through heat exchange and a catalytic combustion method that uses a catalyst at a low temperature of 200 to 350 ° C. However, in the combustion process, toxic oxides such as dioxins, oxides of nitrogen, sulfur oxides, and hydrogen chloride, and carbon dioxide, which is the object of global warming, are used in the burning process. It has a disadvantage in that it is obligatory to install air pollution prevention facility, initial investment cost and maintenance cost, and maintenance is difficult.

In the case where the chemical solution cleaning method is combined in series in two stages, caustic soda and the like are injected into the circulating water of the first stage chemical liquid cleaning tower to neutralize and remove the acid gas in the malodorous gas. In the circulating water of the second stage chemical liquid cleaning tower, sodium hypochlorite And neutralizes the alkaline gas and the residual gas in the malodorous gas. The deodorization method combining two or more steps of chemical cleaning method is high in deodorization efficiency but it is insufficient for application of deodorization method to prepare for stricter regulation of odor pollution due to limit of deodorizing function of chemical liquid, Handling problems due to use, occupational health hygiene and secondary environmental pollution problems.

In case of combining the deodorizing method and the biofilter deodorization method in series, the deodorizing tower is injected into the circulating water of the first step deodorizing tower to absorb the complex odor by absorption, neutralization and oxidation And the microorganism carrier of the second stage biofilter deodorization tower contains Bacillus subtilis efficient application of deodorizing method which adsorbs and decomposes residual odor by attaching strains of subtilis GU1 [Patent Registration No. 10-0949670], but disadvantage that operation cost is increased due to periodic use of ginseng extract or plant extract .

Among the above deodorization methods, the combustion deodorization method using ancillary fuels has high deodorization efficiency, but there is a problem of over installation cost and operational cost, and there is a problem of secondary air pollution, and the chemical liquid deodorization method combining two or more stages, The deodorization method combining the deodorization method with the biofilter and the biofilter deodorization method is an eco-friendly deodorization method, but the deodorization efficiency is high. However, It is necessary to develop an economical deodorization method that removes the high concentration complex odor at a low cost and high efficiency.

On the other hand, the inventor of the present invention has proposed a deodorizing method (patent registration No. 10-0963053) which combines a bio-filter with a bamboo supernatant deodorizing tower using microbes and microbes to treat a high concentration complex odor in an environment- .

The inventor of the present invention has conducted continuous research on the operation of the deodorization method in which the supernatant deodorization tower and the biofilter are connected in series, and the microbial metabolism of the biofilter in place of the supercritical fluid used in the deodorization tower It is possible to remove complex odor substances at a low cost and a high efficiency without using a separate chemical solution. Thus, the present invention has been completed.

The present invention effectively removes dust and odorous substances in the indoor space, and effectively removes dust and odorous substances in the indoor space, and can be used for a livestock manure treatment plant, a food storage and treatment plant, a wastewater treatment plant, a byproduct fertilizer production plant, a waste drying and treatment plant, Air pollutants such as ammonia, sulfur compounds, carbonyl compounds, fatty acids, hydrocarbons, VOCs, food, manure, livestock wastewater, poisonous substances, etc., generated in drying facilities, incineration facilities, industrial facilities, The present invention also provides a bio-filter deodorization apparatus that removes highly concentrated complex odor substances generated during storage and processing of a bio-filter.

The present invention relates to a stool cleaning apparatus comprising a scrubber for cleaning odors, a biofilter connected to the scrubber through a pipe for removing odors using microorganisms, a microbial culture tank connected to the biofilter through a pipe, And a reaction waste solution circulation pipe for recycling the reaction waste solution produced by the reaction of the odor and the microbe in the biofilter to the cleaning solution for cleaning the odor of the scraper in the biofilter .

According to the present invention, the scraper includes: a scrubber body having a spray nozzle for spraying a cleaning liquid on an upper part thereof to remove odors in the air; An inflow portion provided in the scraper main body for introducing an offensive odor by driving the blower; An outlet provided in an upper portion of the scraper main body in which odor is reduced due to a gas-liquid reaction between the malodor and a cleaning liquid, and air containing moisture is discharged; A cleaning liquid storage tank connected to a lower portion of the scraper main body or a cleaning liquid storage tank connected to a lower portion of the scraper main body by piping; And a rinse solution circulation pipe for connecting the rinse solution storage unit or the rinse solution storage tank to the rinse solution spray nozzle, wherein the reaction waste solution circulation pipe is connected to the rinse solution storage unit or the rinse solution storage tank.

The present invention is characterized by further comprising a chemical liquid storage tank connected to the cleaning liquid storage portion or the cleaning liquid storage tank by piping.

In the present invention, the biofilter includes: a biofilter body including a culture solution spray nozzle and a microorganism support layer below the spray nozzle; An inlet connected to the outlet of the scrubber and connected to the lower portion of the microbial carrier layer of the biofilter body through which air containing odor is reduced, An outlet of the biofilter main body through which the odor-free air is discharged while passing through the microorganism carrier layer; And a reaction waste liquid storage tank connected to a lower portion of the biofilter main body through a reaction waste fluid reservoir or a lower portion of the biofilter main body.

The present invention is characterized by further comprising a solid-liquid separator for separating the microbial cells in the reaction waste solution connected to the reaction waste solution reservoir or the reaction waste solution storage tank by piping and the reaction waste solution.

In the present invention, the solid-liquid separator is a tubular separator.

In the present invention, the tubular separator includes a porous separator having an inlet through which a reaction waste solution flows and an outlet through which concentrated water containing microorganisms that have not permeated the separating membrane is discharged; A separation membrane outer body having a porous membrane and a permeate discharge pipe surrounding the porous membrane with a space therebetween and discharging a reaction waste solution from which microorganisms having passed through the porous membrane have been removed; And a suction pump connected to the permeate discharge pipe of the outer body.

The present invention is characterized in that a reaction waste liquid from which microorganisms have been removed from the solid-liquid separator is supplied to the washing liquid storage section or the washing liquid storage tank through the reaction waste liquid circulation pipe, and the microorganisms separated in the solid- liquid separator are supplied to the microorganism culture tank do.

The present invention further includes a sensor unit for generating pH information or flow rate information in the cleaning liquid storage unit, the cleaning liquid storage tank, the reaction waste liquid storage unit, or the reaction waste liquid storage tank, And a controller for calculating the amount of the chemical liquid and the reaction waste liquid required for the cleaning liquid in the cleaning liquid storage unit based on the information and the flow rate information and controlling the supply amounts of the chemical liquid and the reaction waste liquid in accordance with the calculated amount.

The biofilter deodorization apparatus of the present invention is characterized in that when an acidic solution having a pH of about 4 generated by adsorbing and decomposing odorous gases such as hydrogen sulfide into a microorganism carrier inside the biofilter is injected into the circulating water of the washing liquid of the washing- Since the pH of the circulating water is lowered to 5 to 8, preferably to 5 to 7 by neutralizing the circulating water whose pH is increased to 9 to 11, the ammonia, Alkaline odor gas can be continuously and efficiently removed.

In addition, since a cleaning type scrubber is used as a humidifying device for the microbial carrier inside the biofilter, a separate humidification device is not required in the biofilter deodorization tower, and foreign substances such as dust, toxic substances, So that the deodorization efficiency can be maintained at a high level by supplying only the non-toxic, low-concentration residual gas to the biofilter, so that the malodor contamination degree can be stably managed.

In order to neutralize the circulating water of pH 4 or more generated during the process of adsorbing and decomposing the malodorous gas by the microorganisms inside the biofilter, an alkaline chemical such as caustic soda is required and an alkaline chemical dosing pump is additionally provided, Since the circulating water having a pH of about 4 is used as the circulating water of the washing liquid of the washing type scraper which is the previous stage of the biofilter, the drug cost and the installation cost of the chemical feed pump can be reduced.

When the bio-filter deodorizing device is composed of a conventional humidifying device and a microorganism carrier, since the humidifying device only functions to supply moisture to the microorganism carrier, a high concentration of complex odor and toxic harmful gas, The deodorization efficiency is low.

Since the bio-filter deodorization apparatus further requires an alkaline chemical such as caustic soda and an alkaline chemical metering pump to neutralize the circulating water of pH 4 or more generated during the process of adsorbing and decomposing odorous gas by the microorganism, There is a disadvantage that operating costs are increased.

In the case of a deodorization method using a neck deodorization tower and a biofilter deodorization tower using a neck deodorizing apparatus instead of a humidifying device in series connection, odor gas such as ammonia absorbs and adsorbs the deodorant, In order to maintain high deodorization efficiency, it is necessary to additionally install a chemical supply facility that periodically supplies the gypsum supernatant and to take the disinfectant deodorant system because the supernatant is consumed by the neutralization action. have.

When an acidic solution such as sulfuric acid generated by decomposing odorous gas such as hydrogen sulfide is used as a microbial agent of the biofilter deodorizer instead of the deodorant deodorant used in the above- It is advantageous to continuously remove the complex odor of high concentration without injecting the chemical liquid such as the deodorant separately.

Also, since the scrubber for circulating the acidic solution generated in the microbial metabolism process is primarily used by the humidifying device of the microbial carrier inside the biofilter deodorizer, foreign substances such as dust, toxic substances and the like introduced into the deodorization tower of the secondary biofilter High concentration complex odor is removed with high efficiency from the first cleaning scorer, so that only low concentration and low toxic residual gas can be stably removed from the second biofilter deodorization tower, which makes it easy to stably maintain and manage odor pollution.

In addition, since low concentration and low toxic odor materials treated in the primary cleaning scrubber have a low pollution load, when it is removed from the biofilter deodorization tower, the contact time between microorganisms and odor gases can be shortened, In order to prevent the pH decrease due to the acidic water generated in the microbial metabolism process, it is not necessary to inject the caustic soda to be supplied, so that the installation cost of the caustic soda supply facility and the chemical cost are reduced, and the maintenance cost of the microorganism carrier is increased.

In particular, be provided by any one, or two or more additional acidic gases or VOCs or fatty acid or aldehyde remove chemical cleaning device, the metal catalyst deodorizer, plastic smart deodorizer and plant extracts deodorizer for any type of odorant is at a high concentration It is possible to discharge the completely treated gas to the outside even if a large amount is generated.

1 is a schematic view of a natural circulation type biofilter deodorizer according to an embodiment of the present invention.
2 is a schematic view of a natural circulation type biofilter deodorizer according to another embodiment of the present invention.
3 is a schematic view of a compound biofilter deodorizer to which a chemical liquid cleaning device, a metal catalyst deodorization device or a plant extract deodorization device, which is one of the embodiments of the present invention, is added.

Hereinafter, a natural circulation type biofilter deodorizer according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.

The natural circulation type biofilter deodorization apparatus of the present invention comprises a scrubber 10 for cleaning odors, a biofilter 20 connected to the scrubber through a pipe to remove odors using microorganisms, And a microbial culture tank (31) connected to the microbial culture tank (31). The biofilter deodorizer for removing odors and volatile organic compounds includes a reaction waste liquid generated by the reaction of odors and microorganisms in the biofilter, And a reaction waste liquid circulation pipe (34) so as to be recycled to the cleaning liquid for odor washing.

The scrubber 10 of the present invention is a scavenger 10 in which an odorous gas such as hydrogen sulfide is adsorbed and decomposed into a microorganism carrier of a biofilter 20 instead of a chemical solution such as sulfuric acid, sodium hypochlorite or sodium hypochlorite, , Preferably a pH of 3 to 5, and more preferably a pH of 3 to 4, is used as the circulating water for scrubbing the scrubber. The acidic reaction waste liquid is neutralized and adsorbed with ammonia gas, hydrogen sulfide, methyl mercaptan, and the like, and is neutralized and adsorbed with an ammonium acetate salt, a hydrogen sulfide ion, a methyl mercaptan ion or the like to increase pH to 9 to 11, Since the waste liquid is supplied to the cleaning liquid and the pH is lowered to 5 to 8, preferably to 5 to 7, alkaline and odorous gases such as ammonia and trimethylamine are continuously supplied without injecting a chemical liquid such as sulfuric acid or wood And can be removed with high efficiency.

A scrubber (10) of the present invention comprises: a scrubber body (10) having an upper portion of a scrubbing liquid spray nozzle (11) for removing odors in the air; An inlet (12) provided at a lower portion or an upper portion of the scraper main body for introducing an unpleasant odor by driving the blower; An outlet (13) provided at an upper portion of the scraper main body in which odor is reduced by the gas-liquid reaction between the malodor and the cleaning liquid and air containing moisture is discharged; A cleaning liquid storage part (14) at the bottom of the scrubber body; And a cleaning liquid scraper internal circulation pipe 15 connecting the cleaning liquid storage unit 14 and the cleaning liquid spray nozzle 11.

The scrubber 10 of the present invention may have a scrubbing liquid storage unit 14 for storing a scrubbing liquid falling down on the lower part of the scraper main body as shown in FIG. 1, A cleaning liquid storage tank may be provided. The cleaning liquid storage tank is connected to the cleaning liquid spray nozzle 11 through the circulation pipe 15 inside the cleaning liquid scrubber and the reaction liquid waste circulation pipe 34 is connected to the cleaning liquid storage tank or the cleaning liquid storage unit 14.

It is preferable that the scraper 10 of the present invention forms a swirling flow to increase the time during which the odorous substance forced into the main body through the blower 17 stays in the main body, Enhances the contact effect with the cleaning liquid of the present invention to increase the treatment efficiency and also prevents malodorous substances from escaping to the outside.

The number of the spray nozzles for spraying the cleaning liquid over a wide range is set so that the number of the spray nozzles to be installed depends on the pressure of the blower, And the desired treatment efficiency. It is economically advantageous that the spray nozzles are installed upward or downward and that the number and spacing of the spray nozzles are such that the total volume of the spray space and the upward or downward sprayed areas do not overlap each other.

In order to increase the contact efficiency between the cleaning liquid and the malodor material in the droplet form sprayed by the spray nozzle in the body of the scraper 10 according to the present invention, various types of filling material layers 16 such as polling having a wide surface area may be provided have.

In order to prevent an excessive amount of the cleaning liquid sprayed by the spray nozzle from flowing into the biofilter body in the scrubber body, the scrubber dehumidifier 18 may be provided at the bottom of the scrubber outlet 13, It can be installed on the top of the rubber.

The scrubber 10 according to the present invention may further include a chemical liquid storage tank 19 such as a sulfuric acid or a neck liquid so that the pH of the cleaning liquid storage unit 14 or the cleaning liquid storage tank is excessively high, When the supply amount of the waste liquid is insufficient, the chemical liquid can be supplementarily supplied to the cleaning liquid storage unit 14 or the cleaning liquid storage tank.

The biofilter (20) of the present invention comprises: a biofilter body including a spray nozzle (21) at an upper portion and a microbial carrier layer (26) below a spray nozzle; An inlet (22) connected to the outlet (13) of the scraper and connected to the lower portion of the microbial carrier layer of the biofilter main body through which air containing odor is reduced, An outlet (23) provided in the biofilter main body through which the odor-free air is discharged while passing through the microbial carrier layer (26); And a reaction waste liquid storage tank (25) connected to the lower portion of the biofilter main body through a reaction waste liquid reservoir (24) or a lower portion of the biofilter main body.

It is preferable that the washing water supply pipe 39 is connected to the spray nozzle 21 of the biofilter 20 of the present invention in order to periodically clean the microbial carrier layer 26.

In addition, the biofilter 20 of the present invention preferably includes a circulation pipe 35 inside the reaction waste solution biofilter for circulating the reaction waste solution in the biofilter.

It is also preferable that a demister 32 is installed to prevent water from being discharged to the outside through the outflow part 23 on the upper part of the biofilter 20 of the present invention.

In the biofilter deodorization apparatus of the present invention, the microorganism carrier layer 26 contains Bacillus sp. sp.) strain, nitro consumption in eggplant (Nitrosomonas sp.) strain, Pseudomonas species (Pseudomonas sp.) strain, nitro consumption eggplant Europa (Nitrosomonas europaea strain, Nitrobacter < RTI ID = 0.0 > agilis strain, Thiobacillus sp. strain, and the like.

1, the microorganism culture tank 31 and the washing water supply pipe 39 may be connected to the spray nozzle 21, or, if necessary, the nutrient medium supply tank 32 may be connected to the piping And a nutrient medium to which microorganism culture solution, wash water or microorganism is not added, respectively, may be supplied. The microorganism culture tank 31 may further include a temperature controller having a heater or a cooler capable of maintaining the cultured microorganisms at a predetermined temperature.

As shown in FIG. 3, acid or alkali may be supplied to the upper part of the biofilter body through a piping connected to the acid storage tank 37 or the alkali storage tank 38.

The biofilter 20 according to the present invention may include the reaction waste solution reservoir 24 at the lower portion of the biofilter body as shown in FIG. 1, but may also include a reaction waste solution reservoir tank (25) may be separately provided.

The reaction waste solution of the reaction waste solution reservoir 24 or the reaction waste solution reservoir tank 25 is preferably supplied to the cleaning solution reservoir 14 or the cleaning solution reservoir tank 14 of the scrubber 10 at a pH of 3 to 5, Can be mixed with the scrubber liquid through the reaction waste liquid circulation pipe 34 connected to the scrubbing liquid scraper and can be used as circulating water for scrubbing the scrubber through the circulation pipe 15 in the scrubbing liquid scrubber.

Since the reaction waste liquid contains microorganisms desorbed from the microorganism carrier layer and a culture solution which has not been decomposed and contains a high viscosity and a solid content, it is possible to close the holes of the spray nozzle 11 of the scrubber 10 when used as the circulating water, It is preferable to pass the reaction waste liquid through the solid-liquid separator 33 before supplying the cleaning liquid storage tank 14 or the cleaning liquid storage tank of the scrubber 10.

The solid-liquid separator 33 is preferably a tubular separation membrane device or a continuous centrifugal separator for separating the microbial cells contained in the reaction waste solution and the reaction waste solution, which can be used continuously.

Wherein the tubular separation membrane device comprises: a porous separator having an inlet through which the reaction waste solution flows and an outlet through which concentrated water containing microorganisms not permeating through the separation membrane is discharged; A separation membrane outer body having a porous membrane and a permeate discharge pipe surrounding the porous membrane with a space therebetween and discharging a reaction waste solution from which microorganisms having passed through the porous membrane have been removed; And a suction pump connected to the permeate discharge pipe of the outer body.

The membrane permeate of the tubular separation membrane apparatus or the supernatant of the continuous centrifuge is supplied to the washing liquid storage unit 14 or the washing liquid storage tank of the scrubber 10 through the permeate liquid or the supernatant circulating pipe 34 in the reaction waste liquid.

Also, the turbid solution containing the microorganism-containing concentrated water or the precipitate of the continuous centrifugal separator which does not permeate the separation membrane of the tubular separation membrane device is concentrated in the concentrated water or sediment circulation pipe 36- 1 to the reaction waste solution reservoir 24 or the reaction waste solution reservoir tank 25 or omits the circulation process and is circulated through the microbial circulation pipe 36-2 in the reaction waste solution to the microbial culture tank 31 Can be supplied.

The washing liquid storage tank or the reaction waste liquid storage unit 24 or the reaction waste liquid storage tank 25 of the present invention further includes sensor units 41 and 42 for generating pH information or flow rate information And calculating the amount of the chemical liquid and the reaction waste liquid necessary for the cleaning liquid in the cleaning liquid storage unit, based on the pH information and the flow rate information, which are connected to the sensor unit and generated from the sensor unit, And a control unit 50 for controlling the supply amount. The control unit 50 is operated by adjusting the pumps and the valves provided in the supply pipe and the circulation pipe.

The biofilter device of the present invention can be used with one or more deodorizing devices connected in series to the front end or the rear end and can be used as a separate chemical liquid cleaning device, a filter deodorization device, a membrane vaporization device, an ozone oxidation deodorization device, A device, an adsorption deodorization device, a plasma deodorization device, and an incineration deodorization device may be used alone or in a combination of two or more in series.

It is preferable to add the acidic gas or VOCs-removing chemical liquid cleaning device 60 or the metal catalyst deodorizing device or the plant extract deodorizing device to the stage before the scraper 10 of the present invention to prevent the microorganisms from being impacted by the acidic gas And enhances the efficiency of removing odor substances from the bio filter device.

As shown in FIG. 3, the chemical liquid cleaning apparatus 60 includes a scrubber main body having a chemical liquid spray nozzle 61 at an upper portion thereof; An inlet (62) provided at a lower portion or an upper portion of the scraper main body; An outlet 63 provided at an upper portion of the scraper main body; A chemical liquid storage portion (64) at a lower portion of the scraper main body; A chemical solution circulation pipe 65 connecting the chemical solution storage part 64 and the chemical solution spray nozzle 61; And a chemical liquid storage tank 69 for supplying the chemical liquid to the chemical liquid storage portion.

Hereinafter, the present invention will be described in detail with reference to examples. However, the following examples are illustrative of the present invention, but the present invention is not limited thereto.

Example  One:

200 g of phthalocyanine cement, 260 g of silica sand powder, 20 g of lime component, 40 g of alumina cement and 80 g of peat material were mixed with 290 g of water mixed with 20 g of a surfactant for about 3 minutes and the mixture was agitated in a size of 100 mm x 100 mm x 100 mm After molding in a mold, the carrier was cured at 50 ° C for 6 hours and then hydrothermally cured at 180 ° C for 8 hours in an autoclave. The dry specific gravity of the carrier was found to be about 0.33. The pH of the carrier was 10 g, which was mixed with 100 g of water. As a result, the pH of the solution was neutral to about 7.7.

In addition to the patented strain Bacillus subtilis GU1 of the present inventor, Nitrosomonas europaea strain, Nitrobacter < RTI ID = 0.0 > agilis ) and 500 ml of a culture solution (absorbance 0.5) of Nitrosomonas sp. strain were each inoculated on the carrier.

The biofilter main body is 1,800 WX 1,400 LX 2,600 H (6,550 L), and the effective height of the microorganism carrier 800 H (effective volume 2,000 L) is packed as a single layer into a biofilter having a reaction waste solution storage tank at the bottom of the main body, During the operation period, 1000 L of the microbial culture solution was supplied at a rate of 17 L / min for 1 hour, and no pH adjusting agent such as acid or alkali was supplied. The washing water was supplied at a rate of 50 L / min for 3 minutes. The internal temperature of the biofilter was adjusted to keep the temperature above 15 ℃, and the operation time was 12 seconds and the space velocity (SV) of the air was 0.067 m / s.

The scraper main body connected to the biofilter has a poling layer (effective volume 800 L) in two stages, a standard 1,600 W x 1,000 L x 1,600 H (2,500 L), a ventilation capacity of 10 m ³ / min And the air retention time was adjusted to 4.8 seconds. The cleaning liquid reservoir (capacity: 1,000 L) at the bottom of the main body was manufactured to be continuously sprayed with two spiral nozzles by a circulating liquid feed pump (capacity: 50 L / min).

The deodorizing device connected to the scrubber and the biofilter was tested for the odor gas discharged from the collecting tank of the public facility of the livestock manure. Until the microorganism was stabilized in the microbial carrier inside the biofilter body, % In order to dilute, 3 L of the white rice extract was mixed with 1,000 L of washing water and circulated to the washing liquid. In this case, the amount of reaction waste generated during the operation for one week was about 3,000 L except for the wet gas, which was discharged to the outside of the scraper. 6 L was consumed per week.

After 1 month of stabilization of the microbial cells of the biofilter, the odorous gas discharged from the collecting tank of the livestock manure wastewater was finally removed from the biofilter through a scrubber, and the reaction waste solution produced from the microbial carrier was pH 2.5 to 5 (average 3.8) Respectively. During the operation, the total volume of reaction wastewater of the biofilter (about 400 liters per day) was introduced into the scrubber cleansing liquid reservoir, but humid air was introduced into the inlet of the biofilter through the scrubber outlet for about 200 liters per day, The washing liquid was discharged four times a day (about 400 L per day) at intervals of 6 hours. When the level of the scrubber cleansing liquid decreased, the washing water was supplemented by about 200 L per day by the operation of the ball tow.

After the microorganisms of the biofilter are stabilized, the entire amount of the reaction wastewater produced in the microorganism carrier is supplied to the washing liquid reservoir of the scrubber, circulating the washing liquid without using the chemical liquid (sulfuric acid, sodium hypochlorite, ≪ / RTI >

Therefore, in operating a deodorizing device in which a scrubber and a biofilter are connected, a scrubber equipped with a reactive waste liquid circulation pipe has a volume of 10 m ³ per minute, compared with a conventional scrubber having no reaction waste solution, Was reduced by 6L per week.

In other words, the expected effect of using an acidic reaction waste liquid instead of a chemical liquid as a scrubber liquid is that it is not necessary to install an alkaline chemical liquid and chemical solution supply facility to neutralize the acidic reaction waste liquid, Since there is no need to install a supply facility, there is a great advantage of improving the economical effect of the non-use of the chemical solution supply facility and the non-use of the chemical solution and the secondary environmental pollution problem.

(Comparative Example 1) in which a chemical solution (unshaven tree extract) is used in a scrubber for operating a deodorizing device in which a scrubber and a biofilter are connected to each other and a microbial carrier The deodorization efficiency of the method using the reaction waste liquid (Example 2) was compared.

Comparative Example  One

Comparative Example 1 was conducted to examine the deodorization efficiency of a deodorizing device connected to a scion of a woodwort extract and a biofilter.

The scrubber body connected to the biofilter has a polling layer (800 L effective volume) in two stages, 1,600 W x 1,000 L x 1,600 H (2,500 L) and the blowing capacity of the blower is 10 m ³ / Min to adjust the air retention time to 4.8 seconds. Continuous spraying was carried out with two spiral nozzles by a cleaning liquid circulating water feed pump (capacity 50 L / min) in the storage portion (capacity: 1,000 L) .

The scrubber circulation washer was prepared by mixing 3 L of the elixir seed extract of pH 4.3 with 1,000 scrubber scrubbers, without using the reaction waste liquid generated from the microbial carrier inside the biofilter body, to produce 0.3% During the operation, the consumed amount of Prunus persicae extract was supplemented by 3 L on the first day and 0.5 L per day afterwards.

The effective size of the microbial carrier is 800H (effective volume: 2,000L), and the supply of the microbial carrier washing water during the operation period is performed at intervals of 8 hours At a rate of 50 L / min for 3 minutes, and the reaction waste generated from the microbial carrier was discharged to the outside without using it. The odor gas passed through the scrubbers was operated for 12 seconds in the supernatant retention time and 0.067 m / s in the space velocity (SV) of the odor gas in the microorganism carrier inside the biofilter body.

Nitrosomonas europaea strain, Nitrobacter agilis strain and Nitrosomonas sp. Strain were inoculated together with Bacillus subtilis GU1 to the microorganism carrier.

The pH range of the reaction waste liquid discharged after cleaning the microbial carrier after the microbial stabilization of the biofilter was 2.5 to 5.

In order to measure the odor pollution, which was removed from the sludge digestion public sewage sludge collecting tank in conjunction with the scrapers and biofilters, we measured them at the outlet of the scraper inlet, the outlet and the outlet of the biofilter. The items of odor substances are ammonia (NH ₃ ), hydrogen sulfide (H ₂ S), methyl mercaptan (CH ₃ SH), and complex odor.

division How to measure Analysis method ammonia Index method UV / VIS Hydrogen sulfide Tedler Bag GC / FPD Methylmercaptan Tedler Bag GC / FPD Complex odor Tedler Bag Air dilution sensory method

Table 3 shows the results of pollutant removal by measuring odor pollution degree three times at intervals of one week at the inlet and outlet of scribe tree extract and the outlet of biofilter.

division Scraper inlet Scraper outlet Bio-filter outlet 1 time Episode 2 3rd time 1 time Episode 2 3rd time 1 time Episode 2 3rd time ammonia
(ppm) Pollution degree 22 23 25 3.0 2.0 2.0 ND ND ND Removal efficiency (%) - - - 86.4 91.3 92.0 100 100 100 Hydrogen sulfide
(ppm) Pollution degree 5.5 5.0 4.0 2.0 1.5 1.5 ND ND ND Removal efficiency (%) - - - 63.6 70.0 62.5 100 100 100 Methylmercaptan
(ppm) Pollution degree 4.0 2.6 3.3 1.0 0.6 1.0 ND ND ND Removal efficiency (%) - - - 75.0 76.9 69.7 100 100 100 Complex odor
(Dilution factor) Pollution degree 3000 3000 3000 Below 500 Below 500 Below 500 Below 100 Below 100 Below 100 Removal efficiency (%) - - - 83.3 83.3 83.3 96.7 96.7 96.7

Example  2:

In Example 2, in order to investigate the deodorization efficiency of a deodorizing device in which a scrubber using a biofilter reaction waste liquid was used instead of a chemical liquid (unleavened tree extract) and a biofilter in a scrubber, the deodorizing efficiency of the deodorizing device discharged from a livestock manure public treatment plant collecting tank The experiment was conducted on odor gas.

The scrubber body connected to the biofilter was operated under the same standard and conditions as in Comparative Example 1, and all of the reaction waste solution (pH 2.5 to 5) generated from the microbial carrier in the biofilter main body was introduced into the scrubber cleansing solution reservoir. During the operation, the reaction waste solution of the biofilter was introduced into the scrubber liquor reservoir about 400 L per day. The humid air was introduced into the inlet of the biofilter through the scrubber outlet for about 200 L per day and the contaminated scrubber liquid (About 400 liters per day) at 6 hour intervals, and about 200 liters of washing water was replenished in the scrubber cleansing liquid reservoir.

The biofilter main body connected to the scrubber was operated under the same standard and conditions as those of Comparative Example 1. The microorganism carrier contained Bacillus subtilis GU1 and Nitrosomonas Europa europaea strain, Nitrobacter < RTI ID = 0.0 > agilis strain, and Nitrosomonas sp. strain were inoculated and stabilized.

Table 3 shows the results of the pollutant removal by measuring the odor pollution degree three times at the scraper inlet and outlet and the biofilter outlet using the reaction waste solution instead of the chemical solution (unleavened tree extract) at intervals of one week.

division Scraper inlet Scraper outlet Bio-filter outlet 1 time Episode 2 3rd time 1 time Episode 2 3rd time 1 time Episode 2 3rd time ammonia
(ppm) Pollution degree 20 21 19 2.5 3.0 2.0 ND ND ND Removal efficiency (%) - - - 88.5 85.7 89.5 100 100 100 Hydrogen sulfide
(ppm) Pollution degree 4.0 3.0 3.0 1.0 0.8 1.0 ND ND ND Removal efficiency (%) - - - 75.0 73.3 66.7 100 100 100 Methylmercaptan
(ppm) Pollution degree 3.5 2.4 2.3 0.8 0.6 0.5 ND ND ND Removal efficiency (%) - - - 77.1 75.0 78.3 100 100 100 Complex odor
(Dilution factor) Pollution degree 3000 3000 3000 Below 500 Below 500 Below 500 Below 100 Below 100 Below 100 Removal efficiency (%) - - - 83.3 83.3 83.3 96.7 96.7 96.7

Deodorization of a method using a chemical liquid (unripe tree extract) in a scrubber and a method using a reaction waste liquid generated in a microbial carrier inside a biofilter body instead of a chemical liquid in a scrubber in operating a deodorizing device in which a scrubber and a biofilter are connected As a result of the efficiency comparison, the deodorization efficiency was higher in both types of operation methods.

As a result, the removal efficiency of ammonia was higher than that of the method using the chemical waste solution. The above results indicate that the extract of Cryptomeria japonica containing about 70 kinds of acidic liquids exhibiting a pH of 4.3 shows a high deodorization efficiency due to the reaction with ammonia, which is an alkaline odor gas, and absorption and neutralization .

In addition, as a result of the investigation, the method using a chemical liquid (sclerotin extract) in the scrubber shows a tendency that the removal efficiency of the hydrogen sulfide is higher than the method using the reaction waste liquid instead of the chemical liquid. The above results indicate that hydrogen sulfide, which is an acidic odor gas, has a high pH due to absorption of odor gas such as ammonia absorbed in scrubber cleansing liquid, and hydrogen sulfide and alkaline cleansing liquid have a tendency of high deodorization efficiency due to neutralization etc. .

10: Scraper 11: Scraper spray nozzle
12: scraper inlet 13: scraper outlet
14: Cleaning liquid storing part 15: Circulating piping inside the cleaning liquid scrubber
16: Scrubber filler layer 17: Scrubber blower
18: Scrabble demister 19: Chemical solution storage tank
20: Biofilter 21: Biofilter spray nozzle
22: Biofilter inlet part 23: Biofilter outlet part
24: reaction waste liquid storage part 25: reaction waste liquid storage tank
26: Microorganism carrier layer 28: Biofilter demister
31: microorganism culture tank 32: nutrient medium storage tank
33: Solid-liquid separator
34: Reaction waste liquid (or permeate or supernatant in reaction waste liquid) Circulating piping
35: Reaction waste liquid Biofilter internal circulation piping
36-1: Concentrated water or sediment circulation piping in the reaction waste solution
36-2: reaction waste liquid (or microorganism in reaction waste liquid) circulation piping
37: acid storage tank 38: alkali storage tank
39: Wash water supply piping
41: pH sensor 42: Flow sensor
50:
60: chemical liquid cleaning device 61: chemical liquid spraying nozzle
62: chemical liquid cleaning device inflow part 63: chemical liquid cleaning device outlet part
64: chemical solution storage part 65: chemical solution circulation piping
66: chemical liquid cleaning device filling material layer 67: chemical liquid cleaning device blower
68: chemical liquid cleaning device demister 69: chemical liquid storage tank

Claims (8)

And a microbial culture tank connected to the biofilter through a pipe to supply a culture liquid. The microbial culture tank is connected to the scrubber through a pipe and removes odors by using microorganisms. The odor and volatile organic compounds A biofilter deodorization apparatus for removing a compound,
And a reaction waste solution circulation pipe for allowing the reaction waste solution produced by the reaction of the odor and the microorganism in the biofilter to be recycled to the cleaning solution for cleaning the odor of the scraper,
Wherein the biofilter comprises: a biofilter body including a spray nozzle and a microbial carrier layer below the spray nozzle; An inflow portion connected to the outflow portion of the scraper and connected to the pipeline so as to pass through the microorganism carrier layer of the biofilter main body in which odor is reduced and air containing moisture is introduced; An outlet of the biofilter main body through which the odor-free air is discharged while passing through the microorganism carrier layer; And a reaction waste liquid storage tank connected to the lower portion of the biofilter body through a reaction waste fluid reservoir or a pipe below the biofilter body,
Further comprising a solid-liquid separator for separating the microbial cells in the reaction waste solution and the reaction waste solution, which are connected to the reaction waste solution reservoir or the reaction waste solution reservoir by piping,
Wherein the solid-liquid separator comprises: a porous separator having an inlet through which the reaction waste solution flows and an outlet through which concentrated water containing microorganisms not permeating through the separation membrane is discharged; A separation membrane outer body having a porous membrane and a permeate discharge pipe surrounding the porous membrane with a space therebetween and discharging a reaction waste solution from which microorganisms having passed through the porous membrane have been removed; And a suction pump connected to the permeate discharge pipe of the outer body,
Wherein the reaction waste liquid from which the microorganism has been removed from the solid-liquid separator is supplied to the washing liquid storage section or the washing liquid storage tank through the reaction waste liquid circulating pipe, and the microorganisms separated in the solid- liquid separator are supplied to the microorganism culture tank Recirculating biofilter deodorizer.
The scraper according to claim 1,
A scrubber body having a spray nozzle for spraying a cleaning liquid on an upper surface thereof to remove odors in the air; An inflow portion provided in the scraper main body for introducing an offensive odor by driving the blower; An outlet provided in an upper portion of the scraper main body in which odor is reduced due to a gas-liquid reaction between the malodor and a cleaning liquid, and air containing moisture is discharged; A cleaning liquid storage tank connected to a lower portion of the scraper main body or a cleaning liquid storage tank connected to a lower portion of the scraper main body by piping; And a rinse solution circulation pipe connecting the rinse solution storage unit or the rinse solution storage tank to the rinse solution spray nozzle,
And the reaction waste solution circulation pipe is connected to the cleaning solution storage part or the cleaning solution storage tank.
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