KR20190036576A - Sewage and waste water treatment system - Google Patents

Abstract

The present invention relates to a wastewater treatment device comprising: a reactor which removes ammonia nitrogen included in wastewater; and a cyclone unit which separates anaerobes from aerobes in the wastewater flowing in from the reactor, and discharges the same. In addition, the cyclone unit comprises: a water collecting tank which collects wastewater discharged from the reactor; a plurality of distribution nozzles which are connected to spurt the wastewater stored in the water collecting tank; a plurality of cyclones which are connected to the plurality of distribution nozzles respectively in order to separate anaerobes from aerobes in the spurted wastewater by using a difference in specific gravity due to vortexes; a plurality of overflow pipes which are connected respectively in order to discharge treatment water including the aerobes separated in the plurality of cyclones; and a plurality of underflow pipes which are connected respectively in order to discharge circulation water including anaerobes separated in the plurality of cyclones to the reactor. Therefore, the wastewater treatment device can separate anaerobes from aerobes in wastewater from which ammonia nitrogen is removed, in order to reuse the anaerobes and to discharge the aerobes.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a wastewater treatment apparatus, and more particularly, to a wastewater treatment apparatus that separates aerobic microorganisms from anaerobic microorganisms in a wastewater from which ammonia nitrogen is removed, reuses the anaerobic microorganisms, ≪ / RTI >

The sludge anaerobic digestion facility, which produces energy by converting the organic matter contained in the sludge into methane gas while treating the sludge discharged from the sewage treatment plant, has the advantages of sludge reduction and energy production. However, since the ammonia There is a disadvantage that the nitrogen load of the sewage treatment plant is increased due to the elution of nitrogen together.

In order to solve this problem, it is necessary to increase the treatment capacity of the sewage treatment plant or reduce the nitrogen load introduced into the sewage treatment plant through the treatment of the sewage backwash water. However, in most sewage treatment plants, there is no space on the site, and it is not easy to increase the treatment capacity because it requires tens of billions of expenses to increase the sewage treatment capacity.

On the other hand, the method of treating nitrogen in sewage water containing sludge anaerobic digestion liquor is simpler and more economical than adding this treatment capacity.

Nitrogen treatment of sewage water has been conducted worldwide since the late 1990s. Recently, facilities for removing high-concentration ammonia nitrogen (NH4-N) have been installed in Europe, USA and Japan.

However, there is a problem that it is difficult to reduce the treatment facility capacity with the existing nitrification-denitration technology.

ANAMMOX is a new technology that can remove ammonia nitrogen (NH4-N), which is attracting attention.

Anamox technology is a reaction carried out by anaerobic bacteria, an autotrophic organism that synthesizes cells from inorganic carbon using ammonia (NH ₄ ⁺ ) and nitrite (NO ₂ ^- ) as substrates in anaerobic conditions, It is also referred to as oxidation (anaerobic AMMONIUM OXIDATION) or deammonification.

Since Anamox technology is an autotrophic reaction in which NH ₄ ⁺ reacts as an electron donor and NO ₂ ^- reacts as an electron acceptor in an anaerobic state to produce nitrogen gas, it is not necessary to supply oxygen for nitrification and organic carbon source for denitrification. The cost is greatly reduced.

In order to remove nitrogen components by the Anammox reaction, ammonia nitrogen (NH ₄ -N) and nitrite nitrogen (NO ₂ -N) must be present in the raw water to be treated.

That is, aerobic ammonium oxidation or nitrification carried out by an autotrophic organism that converts ammonia (NH ₄ ⁺ ) into nitrite (NO ₂ ^- ) under aerobic conditions should be premised.

Since ammonia (NH ₄ ⁺ ) and nitrite (NO ₂ ^- ) should be present at a molar ratio of 1: 1.32 as shown in the following reaction equation, only about 50 to 55% of nitrite must be converted into nitrite nitrogen. (Partial Nitritation).

The reaction of nitrite and anamox is as follows.

Nitrification: 2NH ₄ ⁺ + 1.5O 2 → NH 4 ⁺ + NO 2 ^- + H 2 O + 2H ⁺

Anammox reaction: 1.0NH ₄ ⁺ + 1.32NO ₂ ^- + 0.066HCO ₃ ^- + 0.13H ⁺

→ 1.02N ₂ + 0.26NO ₃ ^- + 0.066CH ₂ O _{0 . 5} N _{0 .15} (biomass) + 2.03H ₂ O

Here, 0.066 CH ₂ O _{0 . 5} N _{0 .15} (biomass) represents anammox bacteria.

By applying aerobic ammonia oxidation + anaerobic ammonia oxidation technique to the removal of ammonia nitrogen in sewage water, the initial investment, operation cost, site area, energy consumption and CO ₂ emission are reduced by 30 ~ 60% or more reduction.

The SBR (Sequencing Batch Reactor), which is the basis of the reaction tank of the present invention, can be classified into a Filling process, a React process, a Settle process, (Draw) process → Idle process.

In the case of a batch reactor (SBR), it is an intermittent inflow system, requiring a settling time, and the treated water is basically discharged through a decanter installed in the upper part of the reactor.

However, the batch reactor (SBR) is an intermittent flow system and has a disadvantage that the reactor capacity is larger than that of the continuous flow reactor.

Korean Registered Patent No. 1288495 (registered on July 16, 2013) Korean Registered Patent No. 1288503 (registered on July 16, 2013) Korean Registered Patent No. 1430722 (registered on August 08, 2014) Korean Patent No. 0586535 (registered on May 26, 2006)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art described above, and it is an object of the present invention to provide a method and apparatus for separating aerobic microorganisms and anaerobic microorganisms from waste ammonia- And a wastewater treatment device.

In order to accomplish the above object, the apparatus for treating wastewater and wastewater according to the present invention comprises a reactor for removing ammonia nitrogen contained in a wastewater, a cyclone for separating anaerobic microorganisms and aerobic microorganisms from wastewater introduced from the reactor, Wherein the cyclone unit comprises: a water collecting tank for collecting waste water discharged from the reactor; a plurality of distribution nozzles connected to jet the waste water / wastewater stored in the water collecting tank; A plurality of cyclones separating the waste water and wastewater into anaerobic microorganisms and aerobic microorganisms by the difference in specific gravity by the vortexes, a plurality of overflow pipes respectively connected to discharge the treated water containing aerobic microorganisms separated from the plurality of cyclones, The circulating water containing the anaerobic microorganisms separated from the cyclone is connected to the reactor And a plurality of underfloor pipes.

In the waste water treatment apparatus of the present invention, the cyclone unit may further include a storage tank for storing the treated water discharged from each of the overflow pipes.

At this time, one end of the overflow pipe may be connected to the upper discharge port of the cyclone, and the other end may be bent downward and connected to the reservoir disposed at the lower part of the water collecting tank.

In the apparatus for treating waste water and wastewater according to the present invention, the cyclone is connected to a dispensing nozzle by a connecting pipe, and a valve is provided in the connecting pipe to control the supply amount and pressure of the waste water.

In the wastewater treatment apparatus of the present invention, a part of the plurality of overflow pipes may discharge part of the treated water containing aerobic microorganisms separated from the plurality of cyclones to the reactor as circulating water.

According to the present invention embodied by the above-described means, after the ammonia nitrogen of the wastewater is removed by the reactor, the anaerobic microorganisms of the wastewater are separated from the aerobic microorganisms by the cyclone unit, so that the anaerobic microorganisms are reused and the aerobic microorganisms are discharged Therefore, there is a very useful effect of preventing the ammonia nitrogen treatment efficiency from lowering in the reactor due to the loss of the anaerobic microorganism Ananomycetes.

In addition, according to the present invention embodied by the above-described means, it is possible to discharge a part of the treated water containing the aerobic microorganisms separated from the plurality of cyclones as the circulating water so as to be re-introduced into the reactor, There is also an effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a process chart showing an overall process of a waste water treatment apparatus according to an embodiment of the present invention; FIG.
2 is a three-dimensional perspective view of a cyclone unit according to an embodiment of the present invention.
3 is a cross-sectional view of a cyclone unit according to an embodiment of the present invention.
4 is an operational view showing the operation of the cyclone unit according to the embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings in order to fully understand the present invention.

The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention.

Therefore, the shapes and the like of the constituent elements shown in the drawings may be exaggerated in order to emphasize a clearer explanation. It should be noted that the same components are denoted by the same reference numerals in the drawings. Further, the detailed description of functions and configurations of known technologies which are considered to be unnecessarily obscuring the gist of the present invention will be omitted.

The apparatus for treating wastewater according to the present invention comprises a reactor (100) for removing ammonia nitrogen contained in a wastewater or wastewater, anaerobic microorganisms of the wastewater flowing into the reactor (100) and an aerobic microorganism, And a cyclone unit (200) for regulating and discharging the water.

The reactor 100 removes ammonia nitrogen contained in the wastewater containing sewage or the like. The reactor 100 includes a reaction tank 110 for storing waste water and wastewater, a fine acid substrate (not shown) provided in the reaction tank 110 And a circulation water pump 130 for discharging ammonia nitrogen-removed waste water from the reaction tank 110 to the cyclone unit 200.

The reaction tank 110 is formed into a rectangular cylinder or a cylindrical shape, and contains waste water and wastewater containing a high concentration of ammonia nitrogen. The reaction tank is filled with aerobic and anaerobic microorganisms, anaerobic ammonia oxidizing bacteria granules with sludge containing aerobic and anaerobic microorganisms, media with sludge containing aerobic and anaerobic microorganisms. Here, the aerobic and anaerobic microorganisms may include aerobic ammonia oxidizing bacteria, aerobic nitrification bacteria, aerobic heterotrophic bacteria, anaerobic heterotrophic bacteria, and anaerobic ammonium oxidizing bacteria (before granule formation).

The medium functions to stably maintain the amount of microorganisms in the reaction tank 110. This medium is formed to a size of 0.5 mm or less and is not sensitive to pH, temperature and UV ultraviolet rays, and is sensitive to mechanical shear stress or biological or chemical influences Not only excellent durability but also good sedimentation and fixability (adhesion ability). In addition, Media has a sludge deposition capacity of more than 5 kg / kg-media and can hold and maintain sludge more than five times that of suspended sludge. In addition, on the surface of the media, sludge containing the aerobic and anaerobic microorganisms mentioned above, that is, aerobic ammonia oxidizing bacteria and aerobic nitrification bacteria and aerobic heterotrophic bacteria and anaerobic heterotrophic bacteria and anaerobic ammonia oxidizing bacteria before granulation are adhered.

Unlike aerobic ammonia oxidizing bacteria, aerobic nitrifying bacteria, aerobic heterotrophic bacteria, and anaerobic heterotrophic bacteria, anaerobic ammonia oxidizing bacteria granules grow in granule form with entanglement of the bacteria . The anaerobic ammonia oxidizing bacteria granules are in the form of granules having a size of about 0.1 to 3 mm and are filled in the reaction tank 110. The aerobic and anaerobic microorganisms mentioned above, Sludge containing heterotrophic bacteria and anaerobic ammonium oxidizing bacteria before granulation is attached.

The circulating water blower 120 supplies air to the micro-acid substrate 122 installed on the inner bottom of the reaction tank 110. The air supplied from the circulating water blower 120 lowers the waste water in the reaction tank 110, Results in an aerobic condition where only nitrification occurs.

The circulating water pump 130 discharges aerobic and anaerobic microorganisms, anaerobic ammonia granules, and medicament-containing bottom wastewater, which are installed inside the reaction tank 110, to the cyclone unit 200, from which ammonia nitrogen has been removed. By this circulating water pump 130, the inflow amount of the waste water and the internal pressure of the cyclone unit 200 are regulated.

The cyclone unit 200 separates anaerobic microorganisms and aerobic microorganisms of the wastewater flowing into the reactor 100 from the difference in specific gravity by vortex and discharges them in the form of circulating water and treated water. As shown in FIGS. 2 and 3, the cyclone unit includes a water collecting tank 210 for collecting the waste water discharged from the reactor 100, a plurality of distribution nozzles (not shown) connected to jet the waste water, A plurality of cyclones 230 for separating the lower wastewater discharged from the plurality of distribution nozzles 220 into anaerobic microorganisms and aerobic microorganisms by the difference in specific gravity by vortex and discharging them as circulating water and treated water, An overflow pipe 240 for discharging the treated water containing aerobic microorganisms discharged from the cyclone of each of the overflow pipes 240, a reservoir 250 for storing the treated water discharged from each overflow pipe 240, a plurality of cyclones 230, And an underflow pipe 260 for discharging the circulating water containing the anaerobic microorganisms discharged from the reactor 100 to the reactor 100.

Here, a portion of the plurality of overflow pipes 240 discharges a part of the treated water containing the aerobic microorganisms separated from the plurality of cyclones 230 to the reactor 100 as the circulating water.

That is, some of the plurality of overflow pipes 240 are connected to the reactor 100.

The water collecting tank 210 is formed in a cylindrical shape to collect bottom and wastewater. An inlet 212 is formed in the upper part of the water collecting tank 210 to allow the bottom / waste water discharged from the reactor 100 to flow.

The distribution nozzles 220 are radially connected to the center of the water collecting vessel 210 to uniformly discharge the wastewater in the water collecting vessel 210.

The cyclone 230 is connected to the plurality of dispensing nozzles 220, and separates and discharges anaerobic microorganisms and aerobic microorganisms contained in the wastewater or wastewater by specific gravity difference. 3, the cyclone 230 is composed of an upper cylindrical portion 232 and a lower conical portion 234. An upper discharge port 233 is formed at the center of the upper end of the cylindrical portion 232, A lower discharge port 235 is formed at the center of the lower end of the discharge port 234. A supply port 236 is formed at one side of the upper portion of the cylindrical portion 232 and connected to the distribution nozzle 220 through a connection pipe 237. The ammonia nitrogen is removed through the supply port 236, Waste water is supplied. In addition, a valve 238 is provided in the connection pipe 237 to regulate the supply amount and pressure of the wastewater and the wastewater. Such a valve is preferably implemented as a ball valve for finely controlling the supply amount and the pressure of the wastewater. , And can be implemented with various valves that can control the supply amount and pressure of the waste water and wastewater as needed. In addition, a plurality of projections 239 are formed on the inner surface of the cyclone 230 so as to be spaced apart from each other along the circumference and the axial direction, so that the sludge adhering to the surface of the granulated anaerobic ammonium oxidizing bacteria is removed, Separated from the wastewater and descended.

The overflow pipe 240 is connected to the upper discharge port 233 of the plurality of cyclones 230 to discharge the treated water containing aerobic microorganisms to the storage tank 250. One end of the overflow pipe 240 Connected to the upper outlet 233 of the cyclone 230 and the other end is gently curved downward and connected to the open top of the reservoir 250.

Here, some of the plurality of overflow pipes 240 are connected to the upper part of the reactor 100 through the open top of the reactor 100.

The storage tank 250 stores the process water discharged from each overflow pipe 240. The storage tank 250 is formed into a cylindrical shape having an open upper portion so that the process water discharged from the overflow pipe 240 is stored And an outlet 252 is formed at the lower center to discharge the treated water. The storage tank 250 is disposed at a lower portion of the water collecting tank 210. The water collecting tank 210 is supported and fixed by a plurality of first brackets 254 installed at intersections of the upper center of the storage tank 250. In addition, a plurality of second brackets 256 are radially provided at the outer peripheral edge of the reservoir 250 to support and fix the lower portions of the plurality of cyclones 230, respectively. In addition, the reservoir may further include a drain valve 258 installed at the lower side to discharge the treated water.

The underflow pipe 260 is connected to the lower outlet 235 of the plurality of cyclones 230 to discharge the circulating water containing anaerobic microorganisms. 1 and 3, one end of the underflow pipe 260 is connected to the lower discharge port 235 of the cyclone 230, and the other end thereof is bent and connected to the open top of the reaction tank 110.

The overall operation and effect of the present invention thus constructed will be described in detail with reference to the accompanying drawings.

First, the reactor 110 of the reactor 100 is filled with anaerobic ammonia granules with sludge containing aerobic and anaerobic microorganisms, aerobic and anaerobic microorganisms, media loaded with sludge containing aerobic and anaerobic microorganisms, The bottom and wastewater containing ammonia nitrogen is continuously introduced into the reactor 110.

Subsequently, when air is supplied into the reaction tank 110 through the micro-acid substrate 122 by the operation of the circulating water blower 120, the inside of the reaction tank 110 becomes aerobic condition where only the nitrification occurs. As a result, Some of it is oxidized by aerobic ammoxidation reaction by aerobic ammonia oxidizing bacteria contained in sludge and converted into nitrite nitrogen.

When the operation of the circulating water blower 120 is stopped to stop the supply of air to the inside of the reaction tank 110, the inside of the reaction tank 110 becomes anaerobic condition. Then, a stirring blade (not shown) When the ammonia oxidizing bacteria granules are stirred in the reaction tank 110, the ammonia nitrogen and the nitrite nitrogen are oxidized by the anaerobic ammonia oxidizing bacteria by the anaerobic ammonium oxidizing bacteria (before being granulated) contained in the anaerobic ammonium oxidizing bacteria granules and the sludge Nitrogen gas, and the anaerobic ammonia oxidizing bacteria grow.

Thus, the wastewater from which ammonia nitrogen has been removed contains anaerobic ammonia granules with sludge containing aerobic and anaerobic microorganisms, and media with sludge containing aerobic and anaerobic microorganisms.

The lower and wastewater containing these components flows into the cyclone unit 200 by the operation of the circulating water pump 130.

The waste water flowing into the water collecting tank 210 through the inlet 212 of the cyclone unit 200 is discharged into the respective cyclones 230 through the plurality of dispensing nozzles 220 and discharged into the cyclone 230 The jetted wastewater flows downward along the cylindrical portion 232 and descends to the conical portion 234 and rises to the center portion.

At this time, the anaerobic ammonia oxidizing bacteria granule collides with the protrusions 239 of the cyclone 230, and the sludge is separated and separated by the descending line recirculation. The media collides with the protrusions 239 to be separated from the sludge after being separated, . Namely, anaerobic microorganisms (anaerobic ammonia oxidizing bacteria granules and medias) having a large specific gravity contained in the lower wastewater fed into the cyclone 230 and containing anammox bacteria are descended by a descending swirl flow (solid line arrow in FIG. 4 ) Flows through the lower discharge port 235, is discharged through the underflow pipe 260, and is introduced into the reaction tank 110 of the reactor 100 in the form of circulating water.

On the other hand, the aerobic microorganisms (ammonia oxidizing bacteria and nitrite oxidizing bacteria) having a small specific gravity are passed through the upper discharge port 233 by the upward swirling flow ( dotted arrow in FIG. 4) rising to the center of the cyclone 230, And then discharged from the discharge port 252 in the form of a post-treatment water stored in the storage tank 250 through the discharge port 252.

Here, a part of the treated water is not stored in the storage tank 250 but is returned to the reactor 100 as circulating water.

It will be apparent to those skilled in the art that various modifications and equivalent arrangements may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Therefore, it is to be understood that the present invention is not limited to the above-described embodiments.

Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

100: Reactor 110: Reactor
120: circulating water blower 130: circulating water pump
200: Cyclone unit 210: Water collecting tank
220: dispense nozzle 230: cyclone
240: overflow pipe 250: storage tank
260: Underflow pipe

Claims (5)

And a cyclone unit for separating and discharging anaerobic microorganisms of aerobic and anaerobic microorganisms flowing into the reactor from the reactor, the apparatus comprising: a reactor for removing ammonia nitrogen contained in the waste water,
The cyclone unit may include a water collecting tank for collecting the waste water discharged from the reactor, a plurality of distribution nozzles connected to discharge the waste water / wastewater stored in the water collecting tank, a plurality of distribution nozzles connected to the plurality of distribution nozzles, A plurality of cyclones separating into anaerobic microorganisms and aerobic microorganisms by the difference in specific gravity by the plurality of cyclones, a plurality of overflow pipes respectively connected to discharge the treated water containing aerobic microorganisms separated from the plurality of cyclones, And a plurality of underfloor pipes respectively connected to discharge the circulating water containing microorganisms to the reactor. The method according to claim 1,
Wherein the cyclone unit further comprises a reservoir for storing the treated water discharged from each of the overflow pipes. The method of claim 2,
Wherein one end of the overflow pipe is connected to the upper discharge port of the cyclone and the other end is bent downward and connected to the storage tank disposed below the water collecting tank. The method according to claim 1,
Wherein the cyclone is connected to a distribution nozzle through a connection pipe, and the connection pipe is provided with a valve to regulate the supply amount and the pressure of the waste water and the waste water. The method according to claim 1,
Wherein a part of the plurality of overflow pipes discharges part of the treated water containing aerobic microorganisms separated from the plurality of cyclones to the reactor as circulating water.

Images