KR100244536B1 - Device for removing high concentration of organism and nitrogen using biological membrane - Google Patents

Abstract

The present invention relates to a high concentration organic matter and nitrogen removal device using a biofilm, the high concentration organic wastewater is introduced through the inlet pipe 15, the crossflow module (7) and the high concentration of microorganisms are filled to remove and denitrate the organic matter An anaerobic filtration phase (1) in which gas, liquid, and solid are separated and discharged to the outlet pipe (16); Wastewater disposed in series through the discharge pipe 16 of the anaerobic filtration phase 1 is introduced into the discharged water, and the reaction air is injected into the effluent passing through the spherical filter 8 through a blower 9 to the remaining organic matter. An aerobic filtration phase (2) to remove the particulate matter and to perform nitrification; The outflow water from the exhalation filtration phase 2 flows into the inside and is partially stored, and the nitrified treated water is treated with a treatment tank 3 that is recycled to the anaerobic filtration phase 1, and the gas, liquid and Excellent separation, stable treatment efficiency, high treatment of wastewater without the need for additional equipment, as well as dilution injection of high concentration of wastewater, wide range of applied load.

In addition, it can flexibly respond to wastewater containing toxic substances, reduce the volume of reactor, omit sedimentation basin, minimize the required site and simplify operation, which is very economical.

Description

High concentration organic matter and nitrogen removal device using biofilm

The present invention relates to a high concentration organic matter and nitrogen removal apparatus using a biofilm, and more particularly, an anaerobic filtration phase filled with a module capable of retaining high concentrations of microorganisms and an aerobic filtration phase filled with a spherical filter medium in series. By connecting to the high concentration organic matter removal and advanced treatment can be carried out at the same time, it was invented to increase the treatment effect by removing nitrogen by recycling the treated water.

The apparatus for treating highly concentrated organic wastewater is generally treated by an anaerobic digestion tank, an anaerobic contact process, an upflow anaerobic sludge blanket process (UASB), and the like.

These devices are difficult to secure stable treatment efficiency due to unstable microbial metabolism in the process when the influent concentration is low or the change is severe.

In addition, most of the high concentration organic wastewater contains high concentrations of organic nitrogen and ammonia nitrogen, so the existing anaerobic digestion tank or aerobic tank cannot remove nitrogen.

Existing process for nitrogen removal is a floating-growth process by alternately connecting anoxic activated sludge tank and aerobic activated sludge tank to remove nitrogen by returning the sludge mixture from aerobic activated sludge tank to anoxic activated sludge tank.

These conventional methods are complicated to operate, convey the settling sludge from the settling basin, and convey the sludge mixture internally, and have a large volume, which is uneconomical in terms of site use.

In addition, it is difficult to secure the sludge settling property in the final settling due to the long residence time, further needs a subsequent treatment process.

An object of the present invention is to provide a high concentration organic matter and nitrogen removal apparatus using a biofilm that is excellent in separation of gas, liquid, and high even at a high linear speed, stable treatment efficiency and high processing of wastewater.

Another object of the present invention is to provide a high concentration organic matter and nitrogen removal apparatus using a biofilm that can be used in a wide range of load range and elastically corresponding to wastewater containing toxic substances.

Another object of the present invention is to provide a high concentration organic matter and nitrogen removal apparatus using a biofilm to reduce the volume of the reaction tank, simplify the process without installing the settling basin to reduce the installation and operating costs.

1 is a schematic diagram of a biofilm system according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Anaerobic Filtration 2: Aerobic Filtration

3: treatment tank 7: crossflow module

8: spherical filter material 9: blower

18: treated water recycle pipe

The purpose of the present invention is the high concentration of organic wastewater is introduced through the inlet pipe 15, the crossflow module 7 and the high concentration of microorganisms are filled with organic matter is removed and denitrated, the gas and liquid and solids are separated outflow pipe Anaerobic filtration phase (1) discharged to (16); Wastewater disposed in series through the discharge pipe 16 of the anaerobic filtration phase 1 is introduced into the discharged water, and the reaction air is injected into the effluent passing through the spherical filter 8 through a blower 9 to the remaining organic matter. An aerobic filtration phase (2) to remove the particulate matter and to perform nitrification; The outflow water of this expiratory filter phase 2 flows into the inside, and a part of it is stored, and the nitrified treated water consists of the treatment water tank 3 recycled to the anaerobic filtration phase 1.

Therefore, it consists of the anaerobic filtration phase (1) which filled the crossflow module of plastic material, and the aerobic filtration phase (2) which filled the spherical filter material (8), and treated water of the aerobic filtration phase (2). By recycling to an anaerobic filtration phase (1), high concentrations of organic matter and nitrogen are simultaneously removed using a biofilm.

The anaerobic filtration phase (1) filled with about 60% of the crossflow module can secure high concentrations of microorganisms and has excellent gas, liquid, and solid separation (gas, liquid, and high separation), which is very resistant to load fluctuations. Efficiency can be obtained.

In addition, focusing on the distribution of volatile acids in the anaerobic filtration phase (1), only the nitrified aerobic filtration water treated in the lower portion of the anaerobic filtration phase (1) having the highest volatile acid concentration is recycled according to the target nitrogen removal efficiency. As well as the addition of an external carbon source, it has the advantage of performing denitrification of the nitrified water completely without the return of microbial sludge.

Although the linear velocity in the anaerobic filtration increases due to recirculation, the operation is smoothly performed by the separation of the gas, liquid, and high solids of the crossflow module, the filling module.

On the other hand, the aerobic filtration phase (2) filled with a spherical filter with a particle diameter of 3 to 5 mm (8) has a heterotrophic nutrient that is involved in organic matter removal by maintaining a plug flow because the heterotrophic microorganism and the independent nutrient microorganism are in competition with each other during nitrification. Independent nutrient microorganisms involved in microbial and nitrification are dualized in a single reactor to remove organic matter and nitrify at the same time.

In addition, the aerobic filtration phase (2) can maintain the SS removal efficiency more than 90% by maintaining a constant gap between the media than the upflow flow of the filtration layer by adopting a downflow flow method.

The system of the present invention fundamentally solved the sedimentation stiffness problem, which is a serious problem of the floating growth process without the need for final settling, and COD 2,000-15,000mg / L and TKN (total Kjeldahl nitrogen), especially ammonia nitrogen 1,000mg / L Organic wastewater below 10kgCOD / ㎥ / day for anaerobic filtration and within 2kgN / ㎥ / day for aerobic filtration, 99% of COD and particulate matter removal efficiency and more than 75% of nitrogen removal efficiency (based on 300% recycling rate) It can be handled with

In addition, the present invention is a process for simultaneously removing high-efficiency organic matter, particulate matter and high-efficiency nitrogen removal, does not require the injection of an external carbon source for nitrogen removal, and does not require the settling basin and multiple stage reaction tanks, the return of the settling sludge and the return of the sludge mixture It is very economically advantageous since it can simplify the operation and reduce the additional equipment because it is not necessary.

In addition, in the case of wastewater containing high concentration of nitrogen by recycling, the inflow nitrogen concentration is reduced by dilution.

In general, when ammonia nitrogen concentration is high, inhibition by free ammonia occurs severely, but the present invention reduces the concentration of ammonia nitrogen by recycling, thereby mitigating the toxicity of free ammonia.

Therefore, the reliability of the treatment efficiency is high and the operation is easy, so that it can be stably applied to the wastewater of various concentration ranges.

Hereinafter, preferred embodiments of the present invention will be described in detail by the accompanying drawings.

1 shows a schematic view of the apparatus of the present invention, in which some of the treated water treated in the aerobic filtration bed 2 arranged in series with the anaerobic filtration bed 1 is stored in the treatment tank 3 and the nitrified treatment The number can be seen in the flow of the basic device recycled to the anaerobic filtration phase (1).

That is, the anaerobic filtration phase (1) has a structure that fills the crossflow module (7) to about 60% below the effluent level and flows into the bottom to flow out to the top. The exhalation filter (2) fills the spherical filter (8) at a height of approximately 1 to 2 m from the filter support, and a back washing machine (10), which is a backwashing air supply device, and a nozzle for spraying the backwash water are installed under the filter support. It consists of an outlet and a backwash water supply port.

The upper part of the exhalation filtration phase 2 is provided with a backwash drain 6 and a level switch 25 for determining the backwashing timing. The treatment water tank 3 includes a treatment water recycling pipe 18 and a backwash water supply pipe 22, and the chemical tank 4 is provided with an impeller 27 for stirring the medicine.

High concentration organic wastewater to be treated is introduced into the lower portion of the anaerobic filtration phase (1) via the inlet pipe (15) by the inflow pump (11).

High concentration of microorganisms are accumulated in the lower part of the anaerobic filtration phase (1) to facilitate contact with the wastewater and microorganisms, and passes through the crossflow module (7) through the lower part of the anaerobic filtration phase (1). The crossflow module 7 prevents short circuits of the wastewater and increases contact with microorganisms as much as possible.

In addition, gas, liquid, and solid separation are effectively performed by the flow of the three-dimensional wastewater by the crossflow module 7.

Wastewater that has passed through the anaerobic filtration phase (1) is introduced into the aerobic filtration phase (2) through the outlet pipe (16).

When the effluent of the anaerobic filtration phase (1) flows into the upper part of the aerobic filtration phase (2), it passes through the filter bed of the spherical filter (8). The aerobic filtration phase (2) is injected with the reaction air by the blower (9). The plug flow is maintained due to the nature of the aerobic filtration phase (2).

In this case, in the case of suspended growth, since the activity of the autotrophic microorganism for nitrification is lowered in a single reactor in which the heterotrophic microorganism is active, the aerobic filtration phase (2) of the present invention maintains the plug flow. The heterotrophic microorganism is attached at the upper part of the aerobic filtration phase (2) where the concentration of organic matter is high, and the independent nutritional microorganism is attached at the lower part of the organic concentration, so that organic matter removal and nitrification can be simultaneously performed in a single reactor with a short residence time. You can do it.

On the other hand, wastewater that passes through the filter bed is organically removed and nitrified in a short residence time, and more than 90% of the particulate matter is removed by the trapping ability of the biofilm attached to the filter medium.

The aerobic filtration phase 2 causes loss heads due to the increase in the thickness of the biofilm attached to the media or trapped particulate matter. When the level of the aerobic filtration phase 2 increases due to the increase of the head of the loss, the level switch 25 detects the level and automatically backwashes when the level is reached. Backwashing is first injected into the lower portion of the aerobic filtration phase (2) through the backwashing air supply pipe (21) supplied by the blower (9) to be washed in the filter medium only by air. In the next step, the backwash water is injected from the treated water tank 3 through the backwash water pump 12 simultaneously with air to discharge the desorbed biological and trapped particulate matter to the backwash water outlet 6.

The discharged backwash wastewater is recycled to the anaerobic filtration phase (1) through the backwash wastewater recycle pipe (18a) and the backwash recycle pump (13a).

In general, the suspended growth process concentrates and treats the waste sludge generated in the sedimentation basin, while the system of the present invention simplifies the process by recycling the backwash wastewater into the anaerobic filtration phase (1) and is economical in terms of operation of the process.

When nitrification is carried out in the aerobic filtration phase (2), an alkalinity of 7.14 mg CaCO ₃ / L per mg of nitrogen is consumed.

Denitrification in anaerobic filtration produces alkalinity, but if alkalinity / nitrogen ratio of the aerobic filtration influent flowing out of anaerobic filtration (1) is less than 7.14, alkalinity is supplied from the chemical bath (4). For injection medicine, NaHCO ₃ or NaOH should be used. The chemical is injected into the upper portion of the aerobic filtration phase (2) through the chemical injection pump (14).

The effluent from the aerobic filtration phase (2) flows into the treatment tank, and part of the treatment water is used as backwash water, and is recycled to the anaerobic filtration phase (1) according to the recycling rate. The use of the backwash channel flows into the lower part of the aerobic filtration phase (2) via the backwash water pump (12) during backwashing.

Recirculation is recycled to the inlet of the anaerobic filtration phase (1) via the treated water recycle pump (13).

Since the treated water of the aerobic filtration phase (2) is nitrification is completed, the denitrification is carried out to the lower portion of the anaerobic filtration phase (1) as a high concentration of organic wastewater.

At this time, when denitrification, the use of volatile acid generated in the lower portion of the anaerobic filtration phase (1) as a carbon source and alkalinity is generated during denitrification, thereby reducing the pH decrease by volatilization of the anaerobic filtration phase (1).

Recirculation is also very effective when the concentration of influent is too high. In other words, when the concentration of organic matter is high or the concentration of ammonia nitrogen is high, the concentration can be diluted by recycling the treated water.

The table below shows the total removal efficiency according to the circulation rate of the treated water as an example.

Examples of the treatment effect of high concentration organic matter and nitrogen removal system by the biofilm of the present invention are as follows.

Anaerobic aerobic membrane device of the present invention as described above, First, the crossflow module of the anaerobic filtration ensures a high concentration of microorganisms, and excellent separation of gas, liquid, high at a high linear velocity, stable processing efficiency.

Second, the aerobic filtration phase (2) filled with the spherical filter material (8) can also be highly advanced treatment of wastewater without the need for additional equipment by removing the particulate matter as well as high-efficiency organic matter removal at the same time.

Third, the present invention can obtain the effect of diluting high concentration of wastewater by recycling the treated water, so that the application load range is wide.

Fourth, it is possible to respond flexibly to wastewater containing toxic substances.

Fifth, the removal of organic matter and nitrogen with high efficiency not only reduced the volume of the reactor, but also omitted the sedimentation basin and transported the backwash sludge to the anaerobic filter to simplify the process and minimize the required site.

Sixth, it is very economical because it can be greatly reduced to about 1/2 or less of the required site required for the organic matter and nitrogen removal system according to the prior art.

Claims (4)

In the organic matter and nitrogen removal apparatus for treating the wastewater in the anaerobic filtration phase and an aerobic filtration phase and then returning the treated water to the anaerobic filtration phase, a high concentration of organic wastewater is introduced through the inlet pipe (15), the crossflow module (7) And an anaerobic filtration phase (1) in which a high concentration of microorganisms is filled to remove organic matter and denitrification, and gas and liquid and solids are separated and discharged to the outlet pipe 16. Wastewater disposed in series through the discharge pipe 16 of the anaerobic filtration phase 1 is introduced into the discharged water, and the reaction air is injected into the effluent passing through the spherical filter 8 through a blower 9 to the remaining organic matter. An aerobic filtration phase (2) to remove particulate matter and to perform nitrification; High concentration organic matter using a biofilm, characterized in that the effluent of the aerobic filtration phase (2) is introduced into the interior, a part of which is stored, and the nitrified treated water consists of a treatment water tank (3) which is recycled to the anaerobic filtration phase (1). Nitrogen removal device. The biofilm of claim 1, wherein the aerobic filtration phase (2) is configured such that the flow in the anaerobic filtration phase (1) is maintained in a plug flow in a downflow flow method in which the effluent flows into the upper portion and flows out to the lower portion. High concentration organic matter and nitrogen removal device using. The method according to claim 1, wherein the anaerobic filtration phase (1) has a high concentration of adherent microorganisms can be treated with high concentration of wastewater within COD 2,000 ~ 15,000mg / L and TKN 1,000mg / L, characterized in that the high concentration Organic matter and nitrogen removal device. The bio-film according to claim 1, wherein the aerobic filtration phase (2) is provided with a backwash water supply pipe (22), and a chemical for adjusting the alkalinity is supplied from the chemical tank (4) when the alkalinity / nitrogen ratio is 7.14 or less. High concentration organic substance and nitrogen removal device using.

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