KR960011042B1 - Biofilter manufacturing method and removing method of h2s - Google Patents

Abstract

The biofilter is made of inorganic porous carrier as supporter of microorganism and mixture of 0.3-1.2g (NH4)3HPO4, 1-2g yeast extract and 1L water as nutrient of microorganism. The carrier is made of ceramic, silica aluminum or activated carbon and its particle size is +4-7mm. H2S is removed by bonding the biofilter to exhaust port of wastewater treatment equipment.

Description

Method for producing biosulfide removal filter and method for removing hydrogen sulphide using the biofilter

1 is a process diagram schematically showing a process for removing hydrogen sulfide using the biofill filling according to the present invention and the prior art.

* Explanation of symbols for the main parts of the drawings

1: sodium sulfide (Na ₂ S, 3%) 2: pump

3: air tank 4: distilled water

5: agitator 6: hydrogen chloride (HCl, 5%)

7: Reaction tube filled with the filler (turbulent) of the present invention

8: Reaction tube filled with conventional filling material (compost)

9: branch pipe 10,10 ': gas flow meter

11 gastec 12 magnet bar

The present invention relates to a method for manufacturing a hydrogen sulfide removal biofilter and a method for removing hydrogen sulfide using the biofilter, and more particularly, an air pollutant, an odorous component, and a toxic component using an inorganic porous carrier as a filler of the biofilter. And a method for producing a hydrogen sulfide removal biofilter capable of economically and effectively removing corrosive hydrogen sulfide (H ₂ S) and a method for removing hydrogen sulfide using the biofilter.

In general, hydrogen sulfide is mainly generated during wastewater treatment, and is an air pollutant with odor, toxicity, and corrosiveness. These hydrogen sulfides have been removed by adsorbing on activated carbon or using compositions containing microorganisms such as compposts.

However, the removal of hydrogen sulphide using activated carbon has high disadvantages in terms of treatment efficiency, but it is disadvantageous in terms of economical disadvantages. Also, the use of microorganisms such as compost filled in the reaction tube has had to be replaced and regenerated frequently. In the case of removing hydrogen sulfide, which is an air pollutant and odor, it takes a long time for the hydrogen sulfide to be removed normally after the installation of the device.After a certain time, the filler is bound by the continuous supply of water to remove hydrogen sulfide. The support that provides space for the microorganisms to be used could not play a role, and due to the decrease of hydrogen sulfide removal rate due to the change of the physical environment in the reaction tube, the filler in the reaction tube had to be replaced periodically. In this case, a large amount of time is required to activate the microorganisms of the compost, and the hydrogen sulfide gas is not treated during the activation period, which causes a problem of being released into the atmosphere.

Methods for solving this problem are disclosed in U.S. Patent Nos. 5,015,415, 5,064,763, and Japanese Patent Laid-Open No. 1-184022.

U.S. Patent No. 5,015,415 discloses a device, a filter and a process for removing microorganisms and / or pollutants and / or odors from circulating air by means of a filter comprising one or several chemisorption layers. US Patent No. 5,064,763 describes a method for biologically purifying contaminated air using a biofilter.

In addition, the Japanese Patent reported that the lack of microorganisms used to remove hydrogen sulfide in the biofilter affects the hydrogen sulfide removal rate, and after culturing the microorganisms in the liquid phase, it was added to the filling material to increase the activity of the biofilter. In the case of hydrogen sulfide concentration of 25ppm or less was able to expect more than 99.5% activity.

In addition, the currently used hydrogen sulfide biofilter is applied at a low concentration of 50 ppm or less, but at a high concentration, a space velocity that can be treated per unit time (unit per unit time = volume ratio of gas supplied per volume of biofilter (Volume / Volume · hr)) In order to examine the absolute capability in removing hydrogen sulfide, the absolute amount of hydrogen sulfide removal for a certain volume of packed volume per unit time, which includes the concept of space velocity and hydrogen sulfide concentration, is about 3.8 g / m 3 hr. In the case of the biofilter has been used for has shown a limit of the processing capacity of up to 20g / ㎥hr.

In other words, in a biofilter that is used to fill a conventional reaction tube with a compost, after a certain time, the compost gradually changes to a smaller powder form due to the supply of water and the propagation of microorganisms. Due to the entanglement with each other like mud, the porosity of the compost is small, there is a disadvantage that the pressure load in the biofilter is high and the feed gas does not flow well. In addition, there is a problem in rational operation of the biofilter used to remove hydrogen sulfide because it is unable to systematically control the components required to grow the microorganisms contained in the compost.

In addition, in the method of removing hydrogen sulfide using a conventional biofilter, the method of using the compost changes the physical properties of the compost as the operation period becomes longer, which causes the microorganisms to grow. There have been many difficulties in controlling the physical environment in the biofilter such as the supply of necessary water and the flow of feed gas. Due to the change in physical conditions in the biofilter, the concentration of microorganisms that oxidize and remove hydrogen sulfide cannot be increased to a certain level or more, thereby limiting the increase in hydrogen sulfide removal ability.

In order to compensate for this drawback, the present inventors use an inorganic porous carrier as a filler in the reaction tube to serve as a simple support to which microorganisms can be attached, while nutrients necessary for propagation of microorganisms (NH ₄ ) ₃ HPO ₄ and yeast By dissolving the extract in distilled water and supplying it with water supply, the biofilter subdivided the factors affecting the removal of hydrogen sulfide, so that the biofilter was operated more smoothly and hydrogen sulfide was removed at the optimum state.

Accordingly, an object of the present invention is to use a porous material that is excellent in breathability and water retention as an alternative material in order to compensate for various disadvantages due to the physical properties of the filler itself when using the compost which is a filler of a conventional biofilter. It is to provide a method of manufacturing a hydrogen sulfide removal biofilter that can solve the problems such as channeling (channeling), pressure loss, etc., and can more easily control the microorganisms involved in hydrogen sulfide removal.

Another object of the present invention is to provide a method for removing hydrogen sulfide using the biofilter.

The method for preparing a biofilter of the present invention for achieving the above object is to fill an inorganic porous carrier with a microorganism support in the biofilter, and by periodically supplying an aqueous solution consisting of (NH ₄ ) ₃ HP ₄ , yeast extract and water It consists of being manufactured.

The hydrogen sulfide removing method of the present invention for achieving another object of the present invention is filled with an inorganic porous carrier with a microorganism support in the biofilter, and (NH ₄ ) ₃ HP ₄ yeast extract and an aqueous solution consisting of water is periodically supplied And a biofilter prepared by attaching the biofilter to the hydrogen sulfide outlet of the wastewater treatment device to remove hydrogen sulfide.

Hereinafter, the method of the present invention will be described in more detail with reference to the accompanying drawings.

According to the present invention, the inorganic porous carrier is filled with the microorganism support in the biofilter. This is not using the nutrients necessary for the growth of microorganisms in the biofilter included in the existing compost, but by dissolving (NH ₄ ) ₃ HP ₄ and yeast extract in distilled water as nutrients required for the microorganisms in the water supplied to the biofilter. It is then selectively supplied and artificially adjusted for the microorganisms to grow. Therefore, it is easy to manage the operating conditions and predict the biofilter efficiency by separately adjusting the compost, which is a filler of the existing biofilter, as a source of nutrients consumed by microorganisms and a role as a support unit. I can adjust it to a desired state.

(NH ₄ ) ₃ HP ₄ used in the present invention is for supplying N and P components necessary for microbial growth, and is preferably mixed at 0.3 to 1.2 g with respect to 1 L of water. In addition, the yeast extract is preferably added in 1 to 2g per 1L of water in consideration of sufficient nutrition and economic aspects.

The inorganic porous carrier is selected from the group consisting of turbulence, ceramics, silica alumina and activated carbon, and having a particle size of 4 mm to 7 mm is preferable in consideration of breathability and water retention.

In the present invention, the biofilter prepared by the above method is attached to the hydrogen sulfide discharge part of the wastewater treatment apparatus and (NH ₄ ) ₃ HP ₄ of the aqueous solution supplied to the nutrient source of microorganisms in the biofilter according to the concentration and space velocity of hydrogen sulfide to be removed. And by supplying with varying the concentration of yeast extract, it was able to operate the biofilter more smoothly and to remove the hydrogen sulfide in the optimum state by subdividing the factors of the biofilter that affects the hydrogen sulfide removal.

In order to examine the effect of the filler used in the present invention, the experiment was conducted through the apparatus shown in FIG. As the filler used in the above experiment, a commercially available inorganic porous carrier (turbulent) was used to charge the reaction tube 7. The filler was pumped with sodium sulfide (Na ₂ S aqueous solution, 3%, 1). (2) was added to a triangular flask containing hydrogen chloride (HCl, 5%, 6) and stirred through a magnetic rod (12) and an agitator (5) to generate hydrogen sulfide gas, through a branch pipe (9) The air of which the supply amount is adjusted is passed through the liquid phase, and the air whose humidity is increased through bubbling is mixed with the generated hydrogen sulfide gas so as to have a concentration of 100 to 200 ppm, and again, the supply amount is adjusted through the branch pipe (9) and the reaction tube. Passed (7,8).

At this time, the reaction tubes (7,8) using a circular glass reaction tube of 2.6cm in diameter × 40cm in length, and both ends were sealed with air while supplying hydrogen sulfide using a silicone stopper connected to a glass tube with an outer diameter of 6mm.

As described above, in the present invention, the inorganic porous carrier is used as the filler of the biofilter to provide a wider porosity to facilitate the movement of the microorganisms and to provide enough space for the microorganisms to grow, thereby overcoming the limitations of the conventional biofilter. .

In addition, since the supply of the supply gas is smooth, the pressure load in the biofilter is reduced and the physical condition of the filler is not changed, so that the replacement of the filler regularly changed in the biofilter using the conventional compost is unnecessary.

Although the effects of the present invention will be described in more detail with reference to the following examples and comparative examples, the scope of the present invention is not limited to the following examples.

Experiment apparatus

Through the apparatus shown in FIG. 1, sodium sulfide (Na ₂ S aqueous solution, 3%, 1) was introduced into a Erlenmeyer flask containing hydrogen chloride (HCl, 5%, 6) using a pump (2). 12) and agitated through the agitator (5) to generate hydrogen sulfide gas, and through the liquid phase through the air controlled air supply through the branch pipe (9) to mix the air with increased humidity through the bubbling with the generated hydrogen sulfide gas The concentration was 100 ~ 200ppm, and again through the branch pipe (9) to adjust the supply amount to pass through the reaction tubes (7,8).

At this time, a circular glass reaction tube with a diameter of 2.6cm × 40cm was used, and hydrogen sulfide was sealed by supplying hydrogen sulfide using a silicone stopper connected to a glass tube having an outer diameter of 6mm at both ends. At this time, since the moisture content of the inorganic porous carrier is not high, it is repeated 5 to 6 times by receiving water from the bottom through the reaction tube and supplying it again to increase the water moisture content of the carrier. In this case, the temperature was kept at room temperature.

The concentration of hydrogen sulfide in the feed gas and the concentration of hydrogen sulfide in the exhaust gas were measured at regular intervals during the reaction period. At this time, hydrogen sulfide was supplied at a space velocity of 180 hr ^-1 and a concentration of 200 ppm, and hydrogen sulfide removal experiment was conducted to investigate the activity of the carrier.

Fill

As a biofilter filler used in the present invention, a commercially available inorganic porous carrier (turbulent) was used, and as a comparative example, an experiment was performed using an existing compost.

Example 1

After filling the reaction tube with turbulence, the initial time required to remove more than 99.5% of hydrogen sulfide supplied at a concentration of 180hr ^-1 and 200ppm was found to be about 1 week. .

In the conventional method of removing hydrogen sulfide by using a compost, the white foreign matter generated in the reaction tube is generated only in the lower part of the reaction tube.

Water and the supply of nutrients in the reaction tube (NH _{4) 3} If the HP ₄ and 0.8g yeast extract 1.0g supplying a top-down once with 50mL of the reaction tube 2 on the day interval was dissolved in 1L of distilled water, the continuous removal of hydrogen sulfide It was able to eliminate the inconvenience of replacing the existing compost, and the shortcomings of the compost could be solved by improving the breathability and water retention due to the characteristics of the turbulence.

Comparative Example 1

It was found that the initial time required to remove more than 99.5% of hydrogen sulfide supplied at the space velocity of 180hr ^-1 and the concentration of 200ppm after filling the reaction tube was about one week, similar to the turbulence. I could see the appearance. In this case, only the water was supplied from the top down once every two days because of the nutrients of the compost itself.However, due to the supply of water accelerated over time, the compost is entangled, resulting in poor breathability and water retention, and functioning as a microbial filler. I could not see.

In the case of a conventional biofilter using a compost, etc., as the filling material changes over time, the microorganism propagates by ingesting the nutrients of the compost itself. There were many difficulties in manipulating.

As described above, the present invention uses the inorganic porous carrier as a filler of the biofilter, and by separately supplying the nutrient source of the microorganism, the support role and nutrition to provide a space for the microorganism, which is a factor affecting the microbial propagation, and provides nutrition. By separating the role of the source of the ingredients, the inorganic porous carrier is a simple support, which provides a more suitable environment for microorganisms to propagate than composts, and supplies the necessary nutrients with moisture to create better operating conditions for microbial propagation. Through this, it is possible to solve the disadvantages of the prior art, which had difficulty in removing hydrogen sulfide above a certain concentration.

Claims (9)

In the method for producing a hydrogen sulfide removal biofilter, the inorganic porous carrier is filled with a microorganism support in the biofilter, and the aqueous solution consisting of (NH ₄ ) ₃ HP ₄ yeast extract and water is supplied to the nutrient source of the microorganism. Method for producing a biosulfide filter for removing hydrogen sulfide. The method according to claim 1, wherein the inorganic porous carrier is selected from the group consisting of turbulence, ceramics, silica aluminum and activated carbon. The method of claim 1 or 2, wherein the inorganic filler has a particle size of 4 ~ 7mm, the method of producing a hydrogen sulfide biofilter for removing hydrogen sulfide. The method of claim 1, wherein the aqueous solution is prepared by dissolving 0.3 to 1.2 g of (NH ₄ ) ₃ HP ₄ and 1 to 2 g of yeast extract in 1 L of water. In the method of removing hydrogen sulfide by using a biofilter, the inorganic porous carrier is filled with a microorganism support in the biofilter, and an aqueous solution composed of (NH ₄ ) ₃ HP ₄ yeast extract and water is supplied to the nutrient source of the microorganism. And removing the hydrogen sulfide by attaching the prepared biofilter to the hydrogen sulfide discharge part of the wastewater treatment device. 6. The method of claim 5, wherein the inorganic porous carrier is selected from the group consisting of turbulence, ceramics, silica aluminum and activated carbon. 7. The method of removing hydrogen sulfide using a biofilter according to claim 5 or 6, wherein the inorganic filler has a particle size of 4-7 mm. The method of claim 5, wherein the aqueous solution is prepared by dissolving 0.3 to 1.2 g of (NH ₄ ) ₃ HP ₄ and 1 to 2 g of yeast extract in 1 L of water. The method of claim 5, wherein the amount of the aqueous solution is determined by a concentration and a space velocity of the hydrogen sulfide to be removed.