KR20100127107A - Device for wastewater treatment by using activated algae - Google Patents

Abstract

PURPOSE: A wastewater treatment system using activated algae is provided to improve the concentration of microorganisms using a filter media and a solid-liquid separating film inserted into first and second bio-filter media reaction bath. CONSTITUTION: A wastewater treatment system using activated algae comprises the following: a suspended solid removal bath(20) removing suspended solids from sewage(10); a first bio-filter media reaction bath(40) receiving effluent(30) from the suspended solid removal bath; a second bio-filter media reaction bath(50) nitrifying organic materials and ammonia using nitrification bacteria; and a solid-liquid separating tank(60) for obtaining final processed water(70).

Description

Device for wastewater treatment using activated algae {Device for wastewater treatment by using activated algae}

The present invention relates to a wastewater treatment apparatus, and in particular, wastewater treatment using a symbiosis of algae and bacteria, to improve the concentration of microorganisms by injecting a filter medium in a bioreactor, the concentration of microorganisms by injecting a solid-liquid separation membrane in the bioreactor The present invention relates to a sewage treatment apparatus using activated algae which is capable of stably preventing algae discharge which does not have good sedimentability while increasing the concentration of the algae and discharging the concentration of phosphorus water flowing into the lake and river through chemical treatment to the lake level. .

Generally, wastewater treatment process is divided into pretreatment, primary treatment, secondary treatment, advanced treatment, and sludge treatment process, and the secondary treatment process is mainly used as biological treatment process. And a rotating disc method, which initially started with a process for removing organic matter.

Recently, due to the problem of red tide in the sea due to eutrophication has been developed a biological nitrogen and phosphorus removal method. The bioreactor used for nitrogen removal is MLE (Modified Ludzack-Ettinger) process, and the bioreactor used for simultaneous treatment of nitrogen and phosphorus is A2 / O (Anaerobic-Anoxic-Oxic) process and various A2 / O Modifications are being used. In addition, various modification methods of oxidation or sequencing batch reactor (SBR) methods are being developed.

Modifications of foreign A2 / O processes include UCT (University of Cape Town), Bardenpho, PhoStrip, VIP (Initiative Plant), Osawa, Modified University of Cape Town (MUCT), Phase Isolation Ditch (PID), DeNiPho Etc. The media processes include Bioforr of Degremont, O.T.V., Biostyr, and the SBR series include Intermittent Cycle Extended Aeration System (ICEAS), Ominiflo SBR, Cyclic Activated Sludge System (CAS), and CAST.

A2 / O-based processes developed in Korea include DNR (Daewoo Nutrient Removal), NAP (Night Added Process), PungLim Industrial P / L-II, ACS (ASRT Control System), PADDO (Pre-anoxic, Anaerobic) , Anoxic-1, Anoxic-2, Oxic), HDF (Hanwha Dynamic Flow), DeN & P and PhICD (Phase Isolation Intra Clarifier Ditches), and biological nutrient removal methods including sludge denitrification tanks.

The median A2 / O series includes CNR (cilium nutrient removal), SM (samsung media) process, NAP (nightsoil added process), SD Denitrifying Phosphorus Removal (SDPR), BioFor, Hanmee bio reactor (HBR), HBR II, SPAD ( sulfur particle autotrophic denitrification).

Membrane bioreactor (MBR) SYSTEM methods, such as Hyundai Advanced Nutrients Treatment (HANT) and Kolon Immersed Membrane Activated Sludge (KIMAS), are used.

SBR series includes Kumho & KIST intermittently Decanted Extended Aeration (MSIDE), MSBR, Taeyoung's TSBR and CSBR (Constant Sequencing Batch Reactors), AquaMSBR and Pumyang Sequencing Batch Reactors (PSBR).

The above processes are for the bioreactor of wastewater treatment. In this wastewater treatment biological treatment, most of the biological organic matter is decomposed by aerobic dependent microorganisms by supplying oxygen, and the removal of nitrogen by nitrosomonas , Nitrobacter et al.) Occurs after nitrification of denitrifying microorganisms.

In the removal of phosphorus, environmental conditions are achieved by repeating the anaerobic section without dissolved oxygen and oxidizing substance and the aerobic section with dissolved oxygen, through phosphorus release and phosphorus over-intake of the phosphorus-removing microorganism. Other processes of removing nitrogen and phosphorus by physicochemical action include ion exchange, ammonia stripping and flocculation precipitation.

     In order to remove organic matter, nitrogen and phosphorus by the biologically activated sludge process, the supply of oxygen is essential, so the capacity and power cost of the blower required for the mechanical oxygen supply are a large part of the wastewater treatment cost.

In addition, in the sewage treatment process using bacteria, the generation of carbon dioxide, a global warming gas, is caused by the decomposition of organic matter, and in the case of the oxidation paper using the symbiotic relationship between algae and bacteria, the concentration of microorganisms is low and the residence time is lengthened. have.

      In addition, in the case of the oxidized paper, the sedimentation characteristics of the algae change according to the intensity of sunlight, so that a large amount of algae is included in the treated water.

The present invention is to solve the problems of the prior art as described above, an object of the present invention is to enhance the concentration of microorganisms through the filter medium and the solid-liquid separation membrane injected into the first, second biological filter reaction tank, By reliably preventing bad algae emissions, water quality of low effluent is obtained, and activated algae can be used to reduce the energy consumption by reducing oxygen supply than wastewater treatment process using bacteria. The present invention provides a wastewater treatment system.

In addition, an object of the present invention is to reduce the amount of carbon dioxide which is a global warming gas generated during the wastewater treatment process, and the concentration of microorganisms by the growth of adherent algae and bacteria in the media injected into the first and second biological media reactors Sewage water using activated algae can increase the efficiency of effluent by reducing the hydraulic retention time and reducing the discharge of algae with severe sedimentation through the solid-liquid separator injected into the first and second biological medium reactors. To provide a processing device.

In order to achieve the object as described above, the present invention, the floating material removal tank 20 for removing the floating material in the influent sewage (10); A first biological medium reaction tank 40 into which the outflow water 30 of the floating material removing tank 20 is introduced; A second biological filter reactor (50) connected to the first biological filter reactor (40), wherein the organic material and ammonia are nitrated by the organic substance removing heterotrophic bacteria or nitrifying bacteria; And a solid-liquid separation tank (60) for solid-liquid separation of microorganisms from the suspended solid mixture of the second biological medium reaction tank (50) and obtaining a final treatment water (70). do.

Preferably, the suspended solids removal tank 20 is composed of a combination of a screen, a fine screen, a drum screen and a settling basin.

Preferably, the first biological medium reaction tank 40 denitrates the nitrate nitrogen in the internal transport sludge 80 including the nitrate nitrogen nitrated in the solid-liquid separation tank 60 using algae.

Preferably, the solid-liquid separation tank 60, a chemical for removing phosphorus is injected through the chemical injection tank (90).

Preferably, the solid-liquid separation membrane provided in the solid-liquid separation tank 60 has pores in the range of 0.5 to 5 μm.

Preferably, the filter medium injected into the first and second biological filter reactors 40 and 50 is a natural filter or a plastic including one selected from bamboo or stone, or titanium, or Ti. It is a chemical media containing one selected.

According to the wastewater treatment apparatus using the activated alga of the present invention as described above, it has the following effects.

First, it is possible to increase the concentration of microorganisms through the filter medium and the solid-liquid separation membrane injected into the first and second biological filter reaction tank, and stably prevent the discharge of algae having poor sedimentation.

Second, the use of activated algae reduces the energy consumption by reducing the oxygen supply than the wastewater treatment process using bacteria, thereby reducing the cost of wastewater treatment.

Third, it is possible to reduce the amount of carbon dioxide, a global warming gas generated during the wastewater treatment process.

Fourth, adherent algae and bacteria proliferate in the media injected into the first and second biological media reactors, thereby increasing the concentration of microorganisms and reducing the hydraulic retention time.

Fifth, through the solid-liquid separation membrane injected into the first and second biological medium reactor, the efficiency of the effluent can be improved by preventing the discharge of algae with severe change in sedimentation.

Hereinafter, a wastewater treatment apparatus using activated algae according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The terms or words used below should not be construed as being limited to ordinary or dictionary meanings, and the inventors can properly define the concept of terms in order to explain their invention in the best way. It should be interpreted as meanings and concepts corresponding to the technical spirit of the present invention.

1 is a schematic diagram of a wastewater treatment apparatus using activated algae according to an embodiment of the present invention. Referring to this, the wastewater treatment apparatus using activated algae according to the present invention includes a floating material removal tank 20 and a first, And a second biological medium reaction tank (40) (50) and a solid-liquid separation tank (60).

The suspended solids removal tank 20 is composed of a combination of a screen, a fine screen, a drum screen, and a sedimentation basin in the inflow sewage 10 flowing through one side, screen or filtration of the solid material in the inflow sewage 10 After sedimentation and separation to remove the suspended solids to discharge the effluent 30 through the other side.

The first biological filter reaction tank 40 is connected to the floating material removing tank 20 to the inflow of the effluent 30, and removes nitrogen and phosphorus by the algae provided therein, and the inside of the filter medium (not shown) Inject it to increase the concentration of microorganisms.

Processes that can be used in the first biological medium reactor 40 include MLE process, A2 / O process, A2 / O series process using media, various modifications of A2 / O process, media process, oxidation or SBR process, and membrane. Process used, B3 method using a special microorganism can be used.

The second biological filter reaction tank 50 is connected to the first biological filter reaction tank 40, and organic matter and ammonia are nitrified by the organic material removing heterotrophic bacteria or nitrifying bacteria, and the first biological filter reaction tank 40 Likewise, nitrogen and phosphorus are removed by algae, and the concentration of microorganisms is increased by injecting a filter medium.

Processes that can be used in the second biological medium reactor 50 include MLE process, A2 / O process, A2 / O series process using media, various modifications of A2 / O process, media process, oxidation or SBR process, and membrane. Process used, B3 method using a special microorganism can be used.

The solid-liquid separation tank 60 is connected to the second biological filter reaction tank 50 to solid-liquid separation of the suspended solids mixed solution of the second biological filter reaction tank 50 through a solid-liquid separation membrane (not shown) provided therein. The treated water is subjected to solid-liquid separation to obtain the final treated water 70.

At this time, the solid-liquid separation membrane is preferably provided with pores in the range of 0.5 ~ 5 ㎛.

On the other hand, in the present invention as described above, the first biological medium reaction tank 40 denitrates the nitrate nitrogen in the inner transport sludge 80 including the nitrate nitrogen nitrated in the solid-liquid separation tank 60 using algae. .

In addition, the solid-liquid separation tank 60 is connected to the chemical removal tank for phosphorus removal for discharging the phosphorus concentration of the lake or river level is injected through the chemical injection tank (90) is injected.

On the other hand, the filter medium injected into the first and second biological filter reaction tanks 40 and 50 can be used by selecting a natural filter or a chemical filter.

At this time, the natural media can be used by selecting one of the bamboo or stone (stone), the chemical media can be used by selecting one of the plastic (plastic) or titanium (Ti).

The present invention having the above configuration, by using the symbiosis of algae and bacteria to inject the filter medium into the first, second biological filter reaction tank 40, 50 to increase the concentration of microorganisms, the first, second organisms Injecting a solid-liquid separation membrane into the filter medium (40) (50) to increase the concentration of microorganisms, while stably preventing the discharge of algae having poor sedimentation, it is possible to obtain a low effluent water quality.

In addition, the use of activated algae, oxygen is generated by photosynthesis when nutrients are removed, thereby reducing energy consumption by reducing oxygen supply compared to wastewater treatment using bacteria.

In addition, the activated algae reduces the amount of carbon dioxide, a global warming gas generated during wastewater treatment, because carbon dioxide, which is generated during the process of photosynthesis in the process of removing nitrogen and phosphorus, is used as a carbon source. Can be.

In addition, when the filter medium is injected to obtain high bacteria and algae concentrations in the first and second biological medium reaction tanks 40 and 50, the adherent algae and bacteria proliferate to increase the concentration of the microorganisms while maintaining hydraulic retention. You can save time.

In addition, when the solid-liquid separation membrane is injected into the first and second biological medium reaction tanks 40 and 50, the efficiency of the effluent can be improved by preventing the discharge of algae having a severe change in sedimentation.

2 is a graph showing the effect of improving the COD concentration according to the measurement date of the activated algae system according to the present invention, Figure 3 is NH ₄ -N and NO ₃ -N concentration according to the measurement date of the activated algae system according to the present invention It is a graph which showed the improvement effect.

Referring to Figure 2, the initial COD influent (influent) concentration was injected at 400mg / L, but a large amount of bubbles generated in the reaction tank, such as mold occurs in the first tank lowered the inlet concentration and experimented by reducing the HRT, August Until the middle of the year, COD was less removed, and after lowering the C / N ratio, the nitrification occurred and the decomposition of organic matter was also active, indicating that the COD concentration of the effluent was stabilized below 20 mg / L.

In addition, referring to FIG. 3, the concentration of influent NH ₄ -N was gradually stabilized to 25 mg / L or less since August 2, and the NO ₃ -N concentration was also 25 since August 27. It can be seen that it was stable below mg / L.

As described above, the wastewater treatment apparatus using the activated alga according to the present invention has been described with reference to the drawings, but the present invention is not limited by the embodiments and drawings disclosed herein, and various modifications are made by those skilled in the art within the scope of the technical idea of the present invention. Of course, modifications can be made.

1 is a schematic diagram of a wastewater treatment apparatus using activated algae according to an embodiment of the present invention.

Figure 2 is a graph showing the effect of improving the COD concentration according to the measurement date of the activated algae system according to the present invention.

3 is a graph showing the NH ₄ -N and NO ₃ -N concentration improvement effect according to the measurement date of the activated algae system according to the present invention.

Description of the Related Art

10: influent sewage 20: suspended solids removal tank

30: effluent 40: first biological filter reactor

50: second biological medium reaction tank 60: solid-liquid separation tank

70: final treatment water 80: internal conveying sludge

90: chemical injection tank

Claims (6)

Floating material removal tank 20 for removing the floating material in the influent sewage (10); A first biological medium reaction tank 40 into which the outflow water 30 of the floating material removing tank 20 is introduced; A second biological filter reactor (50) connected to the first biological filter reactor (40), wherein the organic material and ammonia are nitrated by the organic substance removing heterotrophic bacteria or nitrifying bacteria; And Solid-liquid separation tank (60) for solid-liquid separation of microorganisms from the suspended solids mixture of the second biological medium reaction tank (50) and to obtain the final treated water (70). The method of claim 1, The floating material removal tank 20, Wastewater treatment apparatus using activated algae, characterized in that the combination of the screen, fine screen, drum screen and sedimentation basin. The method of claim 1, The first biological medium reaction tank 40, The wastewater treatment apparatus using activated algae, characterized in that the nitrate nitrogen in the internal transport sludge (80) containing nitric acid nitrate in the solid-liquid separation tank (60) to denitrate using algae. The method of claim 3, wherein In the solid-liquid separation tank 60, Wastewater treatment apparatus using an activated algae, characterized in that the drug for phosphorus removal is injected through the chemical injection tank (90). The method of claim 3, wherein The solid-liquid separation membrane provided in the solid-liquid separation tank 60, Wastewater treatment apparatus using activated algae, characterized in that having a pore of 0.5 ~ 5 ㎛ range. The method of claim 1, The filter medium injected into the first and second biological filter reactors 40 and 50, Sewage water treatment apparatus using activated algae, characterized in that the natural filter comprising a selected one of the bamboo or stone (plastic), or a chemical filter comprising a selected one of the plastic (plastic) or titanium (Ti).

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