KR20020054304A - The composition and process that bio-filter'carrier maintain the moisture contents continuously for removing stink and volatile organic components - Google Patents

Abstract

PURPOSE: A composition that is capable of keeping stable moisture content of biofilter carrier for removal of odor and volatile organic compounds is provided. CONSTITUTION: The composition comprises (A) a mixture of peat, bark and pine sawdust wherein the weight ratio thereof 1:1:1; (B) perlite with a particle diameter of 8 mm; (C) a mixture of 1 inch Berl Saddles, 1/2 inch Reaching ring, waste tire fragment with a diameter size of 1cm wherein the weight ratio thereof 1:1:1; (D) activated carbon inoculated with microbe; (E) zeolite activated with aerobic microbe from sewage sludge; and (F) polyurethane sponge inoculated with Thiobacillus extracted from biofilter carrier for removal of sulfuretted hydrogen. In the composition, the volume ratio of A:B:C:D:E:F is 3:2:2:1:1:1.

Description

The composition and process that bio-filter'carrier maintain the moisture contents continuously for removing stink and volatile organic components}

The present invention relates to a composition and a manufacturing method for continuously maintaining the water content of the volatile organic compounds and odor removal biofilter carrier, and more specifically to the odor and volatile organic compounds (hereinafter referred to as VOCs) It is an object of the present invention to provide a composition and a method for preparing a carrier media which efficiently improves the use of the biofilter by increasing the water content of the biological media used as the carrier of the biofilter to be removed.

Generally, odors and VOCs contained in contaminated air include physicochemical methods such as chemical cleaning, catalytic oxidation, biofilter, biowasher, air lift, and trickle air bio. There are biochemical methods such as filters (Trickle air biofilter). However, when the physicochemical treatment method is used, secondary pollutants are emitted, and facility and operation costs are incurred. Recently, biochemical methods using microorganisms remove odors and VOCs using waste gas purification technology. It is used a lot. Biofilter is mainly suitable for the case of low solubility of contaminants, which has the advantage of very simple process, low installation cost and operation cost. However, for proper growth of microorganisms, it is difficult to control the process such as additional supply of pH, temperature, moisture, and nutrients, and during the long-term operation, carrier exchange is necessary due to depletion of the water side of the carrier and nutrients. In order to maximize the efficiency of the biofilter, the requirements of the carrier of the biofilter are: first, to secure the area for microbial growth and to have a large specific surface area for improving the adsorption efficiency of the microorganism and the target material; In order to prevent loss and decrease of gas residence time, water expansion rate should be small and porosity high. Third, increase the retention of water, which is a condition of microorganisms and essential for maintaining activity. Fourth, to support the weight increase due to the growth of microorganisms. The requirement of being light at the same time and light at the same time should be met. Finally, the nutrients necessary for the growth activity of microorganisms should be provided to be supplied from inside or outside the carrier itself.

This biofilter has been widely used and known, but there is a problem that the inside of the biofilter is clogged because it is difficult to control the moisture content because it is difficult to control the moisture, which is essential for the growth of microorganisms in the media of the carrier. There was a problem such as not only wasteful resources, but also an ongoing cost of operation, such as the need for exchanging media almost every year because there is no media to enable it.

The present invention controls the composition and composition of the material of the media inside the carrier of the biofilter used to remove odors and VOCs to have an appropriate moisture content to prevent blockage inside the filter and increase the water content to use the media of the biofilter carrier. An object of the present invention is to provide a composition and a method for continuously maintaining the water content of a volatile organic compound and a odor removing biofilter carrier of a natural natural material, which increase the period and simplify the operation.

Mixture (A) which uniformly mixes peat, bark and pine sawdust in a weight ratio of 1: 1: 1 :; 8 mm diameter pearlite (B); A mixture (C) of uniformly mixing 1: 1 inch Berl Saddles (ceramic media), 1/2 inch Reaching ring (ceramic media), waste tire rubber uniformly cut to a diameter of 1: 1: 1 in volume ratio; Activated carbon (D) inoculated with a special microbial liquid formulation; Zeolite (E) activated by an aerobic microorganism of sewage sludge; Polyurethane sponge (F) inoculated with Thiobacillus microbial liquid formulation extracted from hydrogen sulfide gas removal biofilter media with a volume ratio of A; B; C; D; E; F of 3: 2: 2: 1: 1: 1: 1 The carrier media is composed of a homogeneously mixed mixture.

As an example, 10 kg of activated carbon was injected at about 1 liter to maintain a temperature of 40 ° C. for 5 days, and microorganisms were inoculated into activated carbon. The zeolite (E) was mixed with aerobic sewage sludge in a volume ratio of about 5: 1. The temperature of 40 ℃ for 5 days to inoculate the microorganisms in the zeolite and the polyurethane sponge (F) is about 1 liter of the Thiobacillus microbial liquid material extracted from the biofilter media for sulfur dioxide removal Inoculate microorganisms while maintaining a temperature of 40 ° C. for 5 days.

The result of the relevant data is

[Data 1]

According to the data, the water content has different measurements according to the position of the biofilter, and the appearance of a typical biofilter showing an initial stage, an intermediate stage, and a final stage.

[Data 2]

Generally, the content in the media in a known initial state and the change in content with the height in the media after a certain period of operation are shown.

[Data 3]

As the water content in the biofilter media is continuously maintained, it can be seen that the ethylbenzene COD load rate (kg COD / m 3) is kept low for about 56 days (24 to 80 days) after the initial adaptation period.

[Data 4]

Data 4 shows that the water content in the biofilter media is continuously maintained, resulting in removal efficiency of more than about 95% for about 56 days (24 to 80 days) after the initial adaptation period.

[Data 5]

Changes in the content of the biofilter media over a period of time. The average content of 80 days after the initial adaptation period (1 ~ 17 days) is maintained at 80 ~ 100%. The method of converting the moisture content according to the above experimental results is converted into the amount of water (kg) / media (kg).

Biofilters manufactured by the above method do not need to provide water continuously, and thus no additional effort is required, which significantly reduces the operating cost and includes a wide range of organic substances including volatile aliphatic compounds such as ethylbenzene, hexane, and pentane. In addition, even hardly degradable contaminants such as halogen hydrocarbons can be effectively decomposed.

Looking at the detailed action for each of the materials of the present invention as follows.

The above-mentioned ordinary peat is decomposed and altered by biochemical changes such as fungi in the presence of water due to thick deposits of plant-like plants and plants such as moss, reeds and sedges, sometimes pine and birch, etc., in the presence of water. In a broad sense it is included in one type of coal, but is generally distinct from coal. Unlike peat, which has been buried underground like coal, produced under acupressure and geothermal action for a long time, lignin and cellulose, the main constituents of the above-mentioned plants, are mainly decomposed at the surface. It is called 作用). Peat is classified into tundratan, coal peat, wood peat, and heterodyne depending on the kind of raw material and the degree of decomposition. Among them, the most valuable value is peat coal. Peat is mainly composed of plants and plants such as reeds and sedges, and is produced in cold and high cold wetlands.

The structure in which the ferrite and cementite are layered in the steel structure is called perlite, and when 0.76% of carbon steel is slowly cooled at a temperature of about 750 ° C or higher, the transformation occurs at 650 to 600 ° C (this transformation is called A1 transformation). Appears. When examined under a microscope using a ray of light, pearly luster appears and is called pearlite. This is an alternating layer of α-iron (called ferrite) and iron carbide Fe₃C (called cementite). A1 pervert content

to be. As the cooling rate from high temperature increases, the Ar1 point (A1 at the time of cooling) decreases and the pearlite layer becomes fine. In steels with less than 0.76% of carbon, the structure at room temperature becomes perlite and ferrite, and in steels with more than 0.76% of carbon or pearlite and cementite.

In general, activated carbon is produced by treating wood, lignite, peat, etc. with chemicals such as zinc chloride or phosphoric acid as activators, and drying or activating charcoal with water vapor. Generally, activated carbon is manufactured in a powder state or a particle state, and powdered powder may be used in a particle state. Its use is mainly used to absorb gas or moisture as an adsorbent. In addition, it is used for various purposes such as a solvent recovery agent and a gas purification or decolorizing agent. Originally, activation means that atoms, molecules, or ions become high energy due to absorption of radiation or impact of high-speed particle beams, and thus change into a state that is likely to cause chemical reactions or crystal lattice. In addition, the catalytic action means that the function is much higher due to the change of the surface state or the addition of other substances, and thus activated carbon also means that the carbonaceous function is improved by adding such an activator.

Mixing zeolite, which is a mineral of alkali and alkaline earth metal aluminum silicate hydrate, with sewage sludge, which is a sediment from aerobic sewage treatment or water purification, in a volume ratio of about 5: 1, maintaining a temperature of 40 ° C. for 5 days Microorganisms are inoculated with zeolites.

Elastic sponges are also called sponges. These include a rubber type made by foaming a natural rubber solution, and a urethane type made of a synthetic resin of polyurethane. The bacterium, which is a bacterium that obtains the energy necessary for development by oxidizing sulfur or an inorganic compound on a polyurethane sponge, is 1 Inject about 1 liter and maintain the temperature of 40 ℃ for 5 days to inoculate microorganisms. The above bacterium grows in cheoncheon (黄泉), sewage, soil. It is a bacterium that oxidizes sulfur, hydrogen sulfide and other sulfides, sulfites, thiosulphates, and the like, oxidizes hydrogen, or assimilates and expands carbonic anhydride, and does not require organic carbon compounds for its nutrition. The bacterium includes colorless bacterium (Leucothiobacteria) and color bacteria (chromothiobacteria). The colorless bacterium includes Beggiatoa and Thiothrix, which oxidize sulfur compounds and sulfur to perform carbon assimilation. Etc. Colored bacterium includes Thiobacillus, which contains a red or green pigment called bacteriofurfurin in the body and performs photosynthesis using sunlight to produce yellow granules. It is a group of complex and multi-faceted bacteria that are involved in the circulation of sulfur in the soil.

The supply of water to the media consisting of a certain ratio of the constituents is the most important item for proper operation of the biofilter, and it is important to maintain a proper water content inside the media. The findings studied by numerous researchers indicate that 75% of problems with biofilters are due to inadequate moisture control.

Too high or low water content inside the biofilter can cause a wide variety of problems in operation.

High water content can cause the following problems:

① As moisture finds the space between the media instead of air, the pressure loss increases, thus limiting the flow of air.

② The biofilter media will aggregate and cause additional pressure loss.

③ Soluble pollutants with low solubility will limit the diffusion inside the media.

(4) As the contact area of water and air per unit biofilter volume decreases, there is a possibility of problems with smooth oxygen supply.

(5) Anoxic zones with reduced decomposition rates may occur with the development of odors.

⑥ We can remove nutrient from bio filter media.

⑦ There is a possibility of high concentrations of low pH leachate which require further treatment.

Low water content can cause the following problems:

① Degradation rate of microorganism in biofilter may be reduced.

② There is a possibility of cracking inside the biofilter media. In this case, the flow of air flows to the cracks in which the flow occurs, which may result in deterioration of the biofilter activity.

The optimum water content of the biofilter media is not clearly revealed, but many scientists say that the optimal water content range of the biofilter is 40-60%, and the optimum value of the weight ratio is 45-60%. In addition, the media water content of such a biofilter has an important effect on the removal of ethanol and the like. When the water content is less than 49%, the removal ability drops sharply. The conversion of these results is considered to be calculated as moisture / media + moisture. Water content conversion method according to the above data is the data measured by the water content (%) = water content (kg) / media amount (kg).

When the above-mentioned materials are mixed in a predetermined ratio to produce the media of the biofilter, it is characterized by absorbing water well, thereby reducing the additional effort of continuously providing water, and using the present invention as a media. In this case, the biofilter can operate more efficiently and stably.

In addition, looking at the brief operating state of the biofilter device operating using the present invention, in the conventional volatile organic compounds and odor removal device by using a water content measuring instrument and a thermometer in each carrier layer by using a constant change in water content and constant There is additional efficiency in maintaining the water content of the level.

As such, the present invention maintains an appropriate water content by controlling the composition and composition of the material of the media in the carrier of the biofilter to maintain the proper moisture content to provide the optimum growth conditions for microorganisms to grow and odor and By effectively removing VOCs and delaying the exchange of carrier media, it is effective in increasing the utilization of resources by using them for a long time, using natural resources, and providing environmentally friendly conditions.

Claims (2)

Mixture (A) which uniformly mixes peat, bark and pine sawdust in a weight ratio of 1: 1: 1 :; 8 mm diameter pearlite (B); A mixture (C) of uniformly mixing 1: 1 inch Berl Saddles (ceramic media), 1/2 inch Reaching ring (ceramic media), waste tire rubber uniformly cut to a diameter of 1: 1: 1 in volume ratio; Activated carbon (D) inoculated with a special microbial liquid formulation; Zeolite (E) activated by an aerobic microorganism of sewage sludge; Polyurethane sponge (F) inoculated with Thiobacillus microbial liquid formulation extracted from hydrogen sulfide gas removal biofilter media with a volume ratio of A; B; C; D; E; F of 3: 2: 2: 1: 1: 1: 1 A composition and a method for continuously maintaining the water content of the volatile organic compound and the odor removing biofilter carrier, characterized in that the carrier medium is composed of a uniformly mixed mixture. The method according to claim 1, wherein 10 kg of activated carbon is injected at about 1 liter to maintain a temperature of 40 ° C. for 5 days, and microorganisms are inoculated into the activated carbon, and the zeolite (E) has a volume ratio of about 5; 1 in an aerobic sewage sludge. The mixture was maintained at 40 ° C. for 5 days and inoculated with microorganisms in zeolite. The polyurethane sponge (F) contained 1 liter of the Thiobacillus microbial liquid material extracted from the biofilter media for removing sulfur dioxide. A composition and a method for continuously maintaining the water content of the volatile organic compound and the odor removing biofilter carrier, characterized in that the inoculated in about and maintained at a temperature of 40 ℃ for 5 days and inoculated microorganisms.