KR20090098544A - A wastewater treatment method and the apparatus - Google Patents

Abstract

A method for processing wastewater and an apparatus thereof are provided to treat the wastewater with a chemical, physical, and a biological process in a narrow space efficiently, and to reduce maintenance cost of the wastewater. A method for processing wastewater includes the following steps of: removing heavy foreign materials through a precipitation tank(100); filtering big foreign materials through a sieve; discharging the wastewater flowed from a flow control tank(300) through a pump; removing nitrate nitrogen through a denitrification process; guiding nitrification of organic materials and intake of phosphorus by supplying oxygen in processed water flowed from an aeration tank(500); removing the phosphorus by precipitating iron ions with the phosphorus; discharging the filtered processed water; removing organic materials through aerobic microorganism of a biofilm carrier filter(800); storing the processed water in a back washing tank(900); and discharging the remaining processed water through a discharge tank(920).

Description

Wastewater Treatment Method and Its Device {A WASTEWATER TREATMENT METHOD AND THE APPARATUS}

The present invention relates to a wastewater treatment method, and more specifically, it consists of a sedimentation tank, a screen tank, a flow control tank, an anoxic tank, an aerobic tank, an FNR reaction tank, a filtered water tank, an iron electrolyzer, a biofilm carrier filter, a backwash tank, a discharge tank. It relates to a wastewater treatment method for treating and the apparatus.

Generally, there are biological, chemical, and physical methods for treating wastewater, and each method has advantages and disadvantages, and it is applied by using wastewater characteristics, treatment efficiency, and site conditions.

Biological methods are the most basic method of treatment using microorganisms and the processing is simple. However, there can be a large variation in treatment efficiency due to external factors, and the size of the treatment plant must be large during treatment.

The chemical method is a method of using the drug, the treatment efficiency is good and the reaction rate is fast, but the consumption of the drug is large, there is a problem that takes a lot of maintenance costs.

The biological method is that the microorganism, the core of which, grows using dissolved oxygen and organic contaminants to form microbial masses, which are then precipitated out of the settling tank. However, when using the microorganism has a problem that takes up a lot of processing space.

Physical way. It is less affected by external factors and has a lower maintenance cost. However, the nitrogen and phosphorus removal efficiency is low, which is insufficient for advanced treatment.

Accordingly, the present invention was devised to solve the above problems, and an object of the present invention is to stably increase the treatment efficiency, which is a problem when treating standard wastewater, and also to improve chemical, physical, It is to enable the treatment of waste water by biological method.

In order to achieve the above object, the present invention is a waste water treatment waste water through sedimentation tank, screen tank, flow rate adjustment tank, anoxic tank, aerobic tank, iron electrolysis unit, FNR reaction tank, filtered water tank, biofilm carrier filter, backwash tank, discharge tank To be processed.

Therefore, the wastewater treatment method according to the present invention, wastewater treatment through the sedimentation tank, screen tank, flow rate adjustment tank, anoxic tank, aerobic tank, iron electrolysis unit, FNR reaction tank, filtered water tank, biofilm carrier filter, backwash tank, discharge tank Therefore, it is possible to stably increase the treatment efficiency, which is a problem when treating standard wastewater, and also has the effect of treating wastewater by chemical, physical, and biological methods even in a relatively small size of treatment plant.

Hereinafter, a preferred embodiment of the wastewater treatment apparatus according to the present invention will be described in detail with reference to the accompanying drawings, and in describing the present invention, if it is determined that the related well-known technology may blur the gist of the present invention, Detailed description will be omitted.

1 to 4, the sedimentation tank 100, the screen tank 200, the flow rate adjusting tank 300, the oxygen-free tank 400, the aerobic tank 500, the iron electrolysis unit 520, FNR reaction tank 600, a filtered water tank 700, a biofilm carrier filter 800, a backwash water tank 900, and a discharge tank 920.

The sedimentation tank 100, the inclined plate 110 to guide the heavy foreign matter inside the lower side is formed to precipitate and remove the sand, such as heavy foreign matter from the introduced waste water.

The screen tank 200, a plurality of inclined network 210 is arranged to filter out the contaminants, such as large foreign matter in the waste water through the mesh 210 to remove.

The flow rate adjustment tank 300 is to constantly discharge the waste water flowing through the mesh body 210 through the pump 310.

The anoxic tank 400 removes the nitrate nitrogen from the wastewater introduced through the flow rate adjusting tank 300 through a denitrification reaction and discharges the treated water through the blower 410.

The aerobic tank 500 supplies oxygen to the treated water introduced from the anoxic tank 400 to induce nitrification and phosphorus intake of organics in the treated water.

The iron electrolysis unit 520 is a method of precipitating iron ions by passing electricity to the iron plate, which is lower in maintenance cost and easier to manage than a method of injecting a chemical used in general chemical methods, and the precipitated iron ions are soluble causal. Iron phosphate (FePO ₄ ) is produced and precipitated through a chemical reaction.

In the FNR reactor 600, iron ions precipitated in the iron electrolysis unit 520 combine with oxygen to generate iron oxides (Fe ₂ O ₃ , Fe ₃ O ₄ ), which iron oxide adsorbs soluble phosphorus Remove

Fe ₂ O ₃ (s) + PO _4aq . ^3- [Fe ₂ O ₃ -PO ₄ ] _aq .

The biofilm carrier filter 800 has a small gap between the particles of the biofilm carrier 844 so as to filter by the carrier 844 itself, and a strainer 846 and a filtration filter 848 having a fine mesh network type are installed at the top. The iron component of the wastewater and wastewater that has passed through the biofilm carrier 844 is removed.

In the anoxic tank 400, the aerobic tank 500, and the biofilm carrier filter 800, organic matter, nitrogen, phosphorus, etc. are removed by microorganisms.

Looking at the treatment process, sand or large contaminants and iron components are removed from the immersion tank 100 and the screen tank 200 primarily. And the waste water introduced and conveyed in the flow rate adjustment tank 300 is evenly transferred to the oxygen-free tank (400). In the anoxic tank 400, there is no dissolved oxygen necessary for the respiration of microorganisms, so that the breathing is performed using O 2 of nitrated nitrate nitrogen contained in the waste water returned from the aerobic tank 500, whereby nitrate nitrogen is in the form of a gas. Removed with nitrogen. In the aerobic tank 500, organic matter is consumed by the microorganisms attached to the microorganism carrier 510 provided therein, and nitrification proceeds. Subsequently, in the FNR reactor 600, phosphorus is removed by iron ions precipitated from the iron electrolysis unit 520, and the nitrated filthy water is returned to the oxygen-free tank 400 internally. Before moving from the FNR reactor 600 to the filtrate tank 700 is moved through a bottom-up filter zone 620 including a filter medium 622.

The filter zone 620, the filter medium 622 is installed to filter the solid material such as crushed stone is subjected to the first sludge treatment, the sewage through the filter zone 620 is the filtered water tank 700 In the filtered water tank 700, the heavy sludge is secondaryly removed through sedimentation. The precipitated sludge is transferred to the sludge thickening tank 940 by an air lift, and at the same time, the treated water is supplied to the biofilm carrier filter 800 using a pump.

Reference numeral 710 in the figure is a blower for supplying air to the filtered water tank (700).

The biofilm carrier filter 800 is biologically treated by a microorganism attached to the surface of the biofilm carrier 844 like a membrane, and physical filtration is performed through a strainer 846 and a filtration filter 848 provided therein. Part of the washing water generated during backwashing is transferred to the sludge concentration tank 940 and the anoxic tank 400.

The filtered sewage is stored in the parcel and the backwash tank 900 to be used as the parcel water or backwash water, and the rest is transferred to the discharge tank 920, and the discharge tank 920 is disinfected to discharge. .

As shown in FIG. 2, the biofilm carrier filter 800 is biologically treated by a microorganism attached to the surface of a carrier such as a membrane, and is physically filtered by the carrier itself to have a sealed case having an inlet and an outlet. 810 and a wastewater treatment unit 840 provided in the case 810 to treat wastewater.

The case 810 has a space 812 therein, and a cover 814 for sealing the space 812 therein is coupled to an upper side thereof, and an inlet 816 for wastewater inflow is provided at the bottom thereof. And the upper part is provided with a discharge port 818 for the treatment water discharge.

An inlet line is coupled to the inlet 816 of the case 810 so that the wastewater in the tank is pumped through the supply pump to be supplied to the space 812 of the case 810. In addition, the discharge line is coupled to the discharge port 818 of the case 810 to discharge the treated water through the discharge port 818 during the operation of the discharge pump in the water tank.

In addition, a drain line 860 for discharging the foreign matter is provided under the case 810.

The wastewater treatment unit 840 is arranged in the space 812 of the case 810 in the upward direction to filter the wastewater, the fine bubble generator 842 for supplying oxygen to the wastewater, filtering the wastewater with aerobic microorganisms And a biofilm carrier 844, a strainer 846 in which a plurality of fine perforations are formed, and a filtration filter 848.

The strainer 846 has a fine perforation is formed on the surface of the strainer 846 to prevent foreign matter from passing through.

As shown in FIG. 4, the filtration filter 848 includes a central discharge pipe 848a for discharging the treated water and a radially developed from one end of the central discharge pipe 848a so that the filtered water is filtered while the treated water is introduced into the outer surface. It consists of a filter body 848c in which the two holes 848b are formed so that the treated water is discharged through the hole 848b and collected in the central discharge pipe 848a when discharged through the discharge pump.

The biofilm carrier 844 is made of a resin material and is configured to be filled in the upper portion of the space of the case, and has a diameter of 1.5-2.5 mm, a specific surface area of 2200 m 2 / m 3, a porosity of 0.3, and a density of 25 kg / m 3. Aerobic microorganisms are attached to the biofilm carrier 844.

2 or 3, the microbubble generator 842 includes an air supply unit 842a for generating air and air generated from the air supply unit 842a to generate fine bubbles in the wastewater. The provided asymmetric metal membrane membrane 842b allows air to diffuse upwardly through the asymmetric metal membrane membrane 842b when air is generated through the air supply 842a.

At this time, the air is attached to the surface of the solid material forming a plurality of air bubbles to increase the dissolved oxygen.

The microbubble generator 842 is provided with a compressor that can supply more than 4kgf / ㎠ pure oxygen.

In addition, since the air bubble is smaller than that of the general diffuser, the contact area with water is large, which is effective for increasing the dissolved oxygen.

In addition, the aerobic microorganisms on the surface of the biofilm carrier 844 function as an aerobic tank 500 for adsorption and removal of organic substances contained in the wastewater and wastewater, and the biofilm carrier 844 has a small pore between the particles of the biofilm carrier 844. ) As it filters by itself, the sludge cannot pass through. The sludge that has not passed here is sent to the sludge thickening tank 940 when it is backwashed or returned to the anoxic tank 400, which is responsible for the settling tank function.

The upper portion of the biofilm carrier 844 is provided with a strainer 846 having a small pore is formed that can pass only the treated water without passing through.

In addition, a fine mesh network filtration filter 848 is provided above the strainer 846 to remove the iron component of the wastewater passing through the biofilm carrier 844.

The backwashing operation stores the treated water of the biofilm carrier filter 800 in the backwash tank 900 and pressurizes the backwash pump 820 to introduce the backwash water into the outlet 818 of the biofilm carrier filter 800.

The waste water treatment apparatus configured as described above is described in detail by classifying the waste water treatment process in more detail as follows.

In the first step, heavy foreign matter is precipitated and removed from the sewage tank 100 from the introduced wastewater.

In the second process, a large foreign matter is filtered out through the mesh 210 to remove the large foreign matter from the wastewater flowing into the screen tank 200 through the immersion tank 100.

In the third process, the wastewater flowing into the flow rate adjustment tank 300 through the second process is discharged constantly through the pump 310.

In the fourth process, the nitrate nitrogen is removed through the denitrification reaction from the wastewater discharged through the flow rate adjusting tank 300 and introduced into the anoxic tank 400.

In the fifth process, oxygen is supplied to the treated water introduced into the aerobic tank 500 from the anoxic tank 400 to induce nitrification and phosphorus intake of organic substances in the treated water.

It is preferable to further perform a second conveying step of conveying the treated water of the aerobic tank 500 treated in the fifth process to the anoxic tank 400.

In the sixth step, the iron ions precipitated through the electrolysis of the iron electrolysis unit 520 in the treated water introduced into the FNR reaction tank 600 from the aerobic tank 500 is combined with the phosphorus in the treated water to remove phosphorus.

In the sixth step, the FNR reactor 600 further performs a first transfer step of returning the treated nitrified water after the iron electrolysis to the oxygen-free tank 400 of the fourth step through a transfer line.

In the seventh process, the precipitated foreign matter in the treated water introduced into the filtered water tank 700 from the FNR reaction tank 600 is discharged through the pump 720.

In the eighth process, the treated water introduced from the filtered water tank 700 removes organic matter through the aerobic microorganism of the biofilm carrier filter 800.

In the ninth step, the treated water introduced from the biofilm carrier filter 800 is stored in the backwash bath 900.

In the tenth step, the remaining treated water used in the backwash tank 900 is disinfected through the discharge tank 920 and discharged.

1 is a block diagram of a wastewater treatment apparatus according to the present invention,

2 is a cross-sectional configuration view showing a biofilm carrier filter in FIG.

3 is an enlarged cross-sectional view illustrating a main part of the microbubble generator in FIG. 2;

Figure 4 is a plan view showing the filtration filter in FIG.

<Description of the symbols for the main parts of the drawings>

100: tide tank

200: screen

300: flow adjustment tank

400: anoxic

500: Expiry

600: FNR reactor

700: filtered water tank

800: biofilm carrier filter

900: backwash bath

920: discharge tank

Claims (10)

In the wastewater treatment method, A first step of depositing and removing heavy foreign matter from the introduced waste water through an immersion tank; A second step of filtering and removing large foreign substances from the wastewater flowing into the screen tank through the sedimentation tank through the mesh; A third step of constantly discharging wastewater introduced into the flow rate adjustment tank through the pump through the pump; A fourth step of removing nitrate nitrogen from the wastewater discharged through the flow rate adjustment tank and introduced into the anaerobic tank through a denitrification reaction; A fifth step of supplying oxygen to the treated water introduced into the aerobic tank from the anoxic tank to induce nitrification and phosphorus intake of organic substances in the treated water; A sixth step of removing phosphorus by precipitation of iron ions precipitated through the electrolysis of the iron electrolysis unit in the treated water introduced into the FNR reactor from the aerobic tank by precipitation with phosphorus in the treated water; A seventh step of depositing the foreign matter in the treated water introduced into the filtered water tank from the FNR reaction tank and discharging the filtered treated water through a pump; An eighth step of removing organic matter from the filtered water tank through the aerobic microorganisms of the biofilm carrier filter; A ninth step of storing the treated water introduced from the biofilm carrier filter in a backwash bath; And a tenth step of disinfecting and discharging the treated water remaining in the backwash water tank through a discharge tank. The method of claim 1, In the sixth step, the FNR reaction tank further comprises a first conveying process for returning the nitrified treated water after the iron electrolysis to the anoxic tank of the fourth process through a conveying line. The method of claim 1, And a second conveying step of conveying the treated water of the aerobic tank treated in the fifth step to an anoxic tank of the fourth step. The method of claim 1, The biofilm carrier filter, The treated water flowing through the inlet is directed upward through the microbubble generator to allow the treated water to pass through the biofilm carrier, and the treated water passing through the biofilm carrier is moved upward through the micropores of the strainer and continuously through the filtration filter. Wastewater treatment method characterized in that to filter the treated water while being filtered. In the wastewater treatment device, Sedimentation tank for sedimentation and removal of heavy foreign matter from the introduced waste water; A screen tank for filtering and removing large foreign substances from the waste water through the sedimentation tank through the mesh; A flow rate adjusting tank for constantly discharging wastewater introduced through the mesh through a pump; An oxygen free tank for removing nitrate nitrogen from the wastewater introduced through the flow rate adjusting tank through a denitrification reaction; An aerobic tank for supplying oxygen to the treated water introduced from the anoxic tank to induce nitrification and phosphorus intake of organic substances in the treated water; An FNR reactor equipped with an iron electrolysis unit capable of removing phosphorus by depositing iron ions precipitated by electrolysis in combination with phosphorus in the treated water to remove phosphorus from the treated water introduced from the aerobic tank; A filtered water tank configured to settle the foreign matter in the treated water introduced from the FNR reaction tank and discharge the filtered treated water through a pump; A biofilm carrier filter for removing organic matters through aerobic microorganisms from the treated water introduced from the filtered water tank; A backwash bath for storing the treated water introduced from the biofilm carrier filter; And And a discharge tank disinfecting and discharging the remaining treated water used in the backwashing tank. The method of claim 5, The FNR reactor is a wastewater treatment apparatus further comprising a filter zone having a filter medium so as to filter the solid matter from the treated water discharged to one side. The method of claim 5, The biofilm carrier filter, The inside is sealed through the cover, the lower part has an inlet for wastewater inflow and the upper part has a discharge outlet for treatment water discharge; It is configured to include a wastewater treatment unit provided to the inside of the case to be treated and discharged the incoming wastewater; The wastewater treatment unit, A microbubble generator for supplying oxygen to the wastewater, a biofilm carrier for filtering the wastewater with an aerobic microorganism, a strainer having a plurality of fine perforations, and a filtration filter are sequentially provided to filter the wastewater. The method of claim 7, wherein The biofilm carrier, It is made of resin material, waste water treatment apparatus, characterized in that the diameter of 1.5-2.5mm, specific surface area 2200㎡ / ㎥, porosity 0.3, density 25kg / ㎥ The method of claim 7, wherein the filtration filter, A wastewater treatment apparatus comprising a center discharge pipe for discharging the treated water and a filter body that is radially developed from one end of the center discharge pipe and has a plurality of perforations formed to filter the treated water while flowing into the outer surface. The method of claim 7, wherein the microbubble generator, And an asymmetric metal membrane membrane provided with an air supply unit for generating air and air generated from the air supply unit so as to generate fine bubbles in the wastewater.

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