KR100745444B1 - Waste water treatment system using eco media(em) - Google Patents

Abstract

A wastewater treatment system using biological media, which greatly improves the purification action of wastewater by repeatedly dipping and exposing the biological media relative to wastewater and controlling aeration/non-aeration cycles, thereby inducing aerobic/anoxic atmospheres in a single reaction tank, is provided. A wastewater treatment system using biological media comprises: a screen tank(10) and a pre-treatment tank(20) for sequentially screening and pre-treating wastewater flown in from the outside; a flow equalization tank(30) in which an air diffuser(31) is installed to stir wastewater flown in from the screen tank and the pre-treatment tank; a reaction tank(40) which has a plurality of biological media(41) vertically installed from the bottom thereof, which repeatedly performs a process of dipping the media into wastewater flown in from the flow equalization tank to conduct aerating and microorganism-activating actions, and discharging treated water(supernatant) obtained through the aerating and microorganism-activating actions to the outside to expose the media to the outside, and which purifies the wastewater flown in from the flow equalization tank; a disinfecting and discharging tank(50) for disinfecting and discharging treated water discharged from the reaction tank; and a sludge concentration tank(60) for concentrating sludge obtained from the reaction tank.

Description

Waste water treatment system using biological media {waste water treatment system using eco media (EM)}

1 is a view schematically showing an entire system of a wastewater treatment apparatus according to the present invention;

2a to 2d are views sequentially showing the wastewater treatment method of the reaction tank in the present invention,

3 is a view showing a process for biologically removing nitrogen in the waste water in the reaction tank of the present invention,

4 and 5 are graphs showing the COD removal rate and the sedimentation of the reactor in the present invention, respectively.

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

10: screen tank 20: pretreatment tank

30: flow adjustment tank 31: first mountain engine

40: reactor 41: biological media

43: second acid engine 45: decanter pump

50: disinfection discharge tank 51: third acid engine

60: sludge concentration tank 61: fourth acid engine

80,90: first and second blowers

The present invention relates to a wastewater treatment apparatus, and in particular, to induce an aerobic / anoxic environment in a single reactor by repeating the lock and exposure of the biological media from the wastewater and controlling the aeration / non-aeration cycle to greatly enhance the purification of the wastewater. The present invention relates to a wastewater treatment apparatus using media.

In general, in order to solve the water pollution problem, it is very important to remove nutrients that cause problems such as organic matter of wastewater and various eutrophication. However, the existing wastewater treatment device has a limitation that it is difficult to remove nutrients such as nitrogen (N), phosphorus (P), it is a fact that there are many problems such as causing various eutrophication.

Therefore, an object of the present invention is to solve such a problem, and by immersing and exposing biological media from waste water and controlling aeration / non-aeration cycles, the aerobic / aerobic environment is induced in a single reactor, thereby greatly purifying wastewater. It is to provide a wastewater treatment apparatus using a biological medium to enhance.

The present invention for achieving the above object is a screen and pre-treatment tank for sequentially screening and pre-treatment of the waste water introduced from the outside; A flow rate adjustment tank having an diffuser installed to agitate wastewater introduced from the screen and the pretreatment tank; A plurality of biological media is formed from the bottom, and the media are immersed in the wastewater from the flow control tank to perform aeration and microbial activation and discharge the treated water (supernatant) obtained upon completion of the performance. A reaction tank for repeating the exposure of the media to the outside and purifying the waste water from the flow regulating tank; Disinfection discharge tank for discharging to obtain the treated water discharged from the reaction tank; And a sludge concentration tank for obtaining sludge from the reaction tank and concentrating the sludge.

The biological medium is preferably microorganisms attached to a medium having any one of porous or broad surface areas formed of any one of a resin such as ciliated or polyethylene resin and ceramic.

The above objects, advantages and other features will become apparent from the following description with reference to the accompanying drawings.

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

1 is a view schematically showing the entire system of a wastewater treatment apparatus according to the present invention, Figures 2a to 2d is a view showing the wastewater treatment method of the reaction tank in the present invention, Figure 3 is a wastewater in the reaction tank of the present invention 4 and 5 are graphs showing the COD removal rate and sedimentation of the reactor in the present invention, respectively.

As shown in the figure, the wastewater treatment apparatus using the biological filter according to the present invention includes a screen tank 10 and a pretreatment tank 20 which are sequentially connected. The screen tank 10 and the pretreatment tank 20 sequentially remove suspended substances or fine suspended matters from waste water introduced from the outside through gravity sedimentation or flotation, and at this time, a part of the organic matter (BOD) is also removed.

The wastewater treated first while passing through the screen tank 10 and the pretreatment tank 20 moves to the flow regulating tank 30, and the flow regulating tank 30 is provided with a first acid pipe 31 at the bottom of the pretreatment. The waste water which flowed in from the tank 20 is stirred. The flow rate adjusting tank 30 allows sufficient agitation while maintaining the introduced wastewater for a predetermined time. Reference numeral 80 denotes a first blower for supplying air to the first diffuser 31.

The waste water of the flow rate adjustment tank 30 is moved to the reaction tank 40 for purification. The reactor 40 has a form in which a plurality of biological media (MEDIA) 41 are deposited from the bottom, and when the media 41 are immersed in the waste water from the flow regulating tank 30, aeration and microbial activation are performed. To purify the waste water. The medium 41 is a form in which microorganisms are attached to a medium, and the medium has a porous or surface area (preferably 280㎡ / 1g) such as ciliate, polyethylene resin, ceramic, etc., which is very easy to form a microbial group. Its excellent adhesion allows it to live in a variety of microbial populations.

As shown in FIG. 2A, the reaction tank 40 obtains waste water from the flow rate adjusting tank 30 such that the media 41 can be locked. Then, as shown in Figure 2b, the organic material, nitrogen (N) during the process of repeating the aeration and anoxic stirring state through the second acid pipe 43 connected to the second blower (90) for supplying air ), Phosphorus (P), odor, etc. are removed. For example, removal of organic substances, nitrogen (N), phosphorus (P), odors, etc. from waste water occurs during repeated stirring, aeration, anoxic agitation, and aeration processes.

The nitrogen removal occurs through chemical ion exchange and adsorption, biological biosynthesis and nitrification. The media 41 removes some of the nitrogen through ion exchange and adsorption of ionic materials such as NH 4 ^+, and most of the nitrogen is removed through biological denitrification. The process of biologically removing nitrogen in the waste water in the filter medium 41 is as shown in FIG. 3. In the filter medium 41, heterotrophs that are not nitrifying bacteria also remove nitrogen in the wastewater as much as the cell composition ratio of the nitrogen component. Cell composition ratios vary according to microbial species and physiological changes such as substrate type, reactor operating conditions, and microbial specific growth rate by environmental conditions. Nitrification and denitrification, which account for most of the removal of nitrogen from waste water, include nitrification, which converts ammonia nitrogen to nitrates under aerobic conditions, and denitrification, which converts nitrates generated from anoxic conditions to nitrogen gas. The biological nitrification reaction is the conversion of ammonia nitrogen to nitrate nitrogen. It is composed of two stages by the microorganisms of Nitrosomonas, Nitrosococcus, Nitrobacter, and Nitrococcus. Independent nutrient microorganisms that use carbon dioxide as a carbon source for biosynthesis and consumes 7.14 g / gN of alkalinity and 4.57 g / gN of oxygen to completely oxidize 1 g of ammonia nitrogen to nitrate nitrogen. The NO2 ^-- N and N03 ^-- N removal thus produced consists of a catabolism which is reduced to nitrogen gas by an arbitrary heterotrophic microorganism, which is the main mechanism of denitrification of the media (41). Unlike nitrification, denitrification involves microorganisms such as Archrobacter, Aerobacter, Alcaligens, Bacillus, Brevibaterium, Flavobaterium, Lactobacillus, Micrococcus, Proteus, Pseudomons, and Spirillum.

The phosphorus removal includes chemical flocculation and biological phosphorus removal. The microorganisms involved in the biological removal of the media 41 are Bacillus megaterium, Aerobacter aerogene, Pseudomonas fiuorescene, Acinetobacter calcocalius, Proteus vulgaris, Flavobacterium aquatile, Glutamium, etc. As the basic process adopts the aerobic-narrow combined continuous batch activated sludge method, the filter medium 41 maintains high dissolved oxygen (DO) even with a relatively small amount of aeration during the aerobic cycle, and induces excessive intake of phosphorus in the microorganism, In anaerobic influent intermittent injection provides sufficient organic acid to enhance phosphorus treatment efficiency. Phosphorus is concentrated in microorganisms through granular ciuster called Volutin through Embden-Meyerhof Pathway and Kerb cycle.

The malodor removal also includes ion exchange, adsorption and biodegradation. As in the removal of nitrogen, the odor due to ammonia is partially removed by adsorption of the microbial group attached to the filter medium 41, and almost all kinds of odorous substances are quickly absorbed by the porous medium. The odor causing substance absorbed as described above is converted into an odorless, harmless final product through a biological change process by the microorganisms present in high concentration in the filter medium 41. The odor component is dissolved and adsorbed into the porous medium, and the adsorbed odor component undergoes a biooxidative decomposition step in which the growth of the microorganism and the energy source are used. These oxidative decomposition reactions have different load limits because their decomposition rates vary depending on the type of odor. Sulfated bacteria involved in the removal of odors derived from hydrogen sulfide (H2S), which are the main causes of odors in wastewater treatment plants, are Thiobacillus, Thiosphaera, Thiomicrospira, Thermothrix, Beggiatoa, Suifolobus, and the like. Among these microorganisms, the most widely used bacteria (Bacteria), which use various sulfur compounds as substrates and grow at a wide pH and temperature range, are Gramo-negative bacteria of Thiobacillus species, and they are found in soil, hot spring water, etc. Thiobacillus sp. Grows using the energy source generated during hydrogen sulfide oxidation and decomposes odors through oxidation and reduction.

As such, microorganisms are attached to and removed from the filter medium 41 while the removal of organic substances, nitrogen (N), phosphorus (P), odors, etc., from the wastewater, thereby forming sludge having a large size and good sedimentation. Then, as shown in Figure 2c, the operation of the aeration and agitator is stopped and the precipitation proceeds in a state where the flow of water completely stopped, solid-liquid separation is superior to other methods. Then, as shown in Figure 2d, by using only the decanter pump 45, the sludge submerged in the lower portion is discharged only the supernatant separated from the solid-liquid, the media 41 previously submerged in water is exposed to the surface, At this time, as the filter medium 41 is directly contacted with air and dried, the sludge is solidified and crystallized, thereby increasing precipitation and promoting metabolism of microorganisms to promote decomposition of organic matter.

When the process of FIGS. 2a to 2d is repeatedly performed, the media 41 is also exposed to the surface of the microorganisms by being repeatedly exposed to the outside air as the purification of the beach tidal flat is increased by the repetitive action of the high and low tide. Cohesive force is increased, while various microbial groups are formed to greatly increase the ability to remove organic matter from wastewater, and when the cohesive force is removed from the filter medium 41, the sedimentability is increased so that floating matters are not injured. do.

4 is a graph showing the COD removal rate of the reactor 40, while the COD removal rate of the conventional wastewater treatment apparatus is 0.02 to 0.06g COD / g MLSS · d, while the COD removal rate of the reactor 40 is 0.05 to It can be seen that the increase to 0.09 g COD / g MLSS · d. In addition, Figure 5 is a graph showing the precipitation rate of the reaction vessel 40, the conventional sewage treatment apparatus has a sedimentation resistance (SVI) of about 85 while the sedimentation of the reaction vessel 40 is reduced to 60 sludge volume (volume) It can be seen.

Meanwhile, the treated water discharged from the reaction tank 40 is discharged after disinfection by moving to the disinfection discharge tank 50, and sludge from the reaction tank 40 is concentrated in the sludge concentration tank 60 and then discharged. do. Preferably, the disinfection discharge tank 50 and the sludge concentration tank 60 are provided with third and fourth acid engines 51 and 61 respectively connected to the first blower 80.

As described above, according to the present invention, it is possible to induce an aerobic / anoxic environment in a single reactor by greatly submerging and exposing biological media from wastewater and controlling aeration / non-aeration cycles, thereby greatly improving the purification of wastewater. .

Claims (2)

A screen and pretreatment tank for sequentially screening and pretreating wastewater introduced from the outside; A flow rate adjustment tank having an diffuser installed to agitate wastewater introduced from the screen and the pretreatment tank; A plurality of biological media is formed from the bottom, and the media are immersed in the wastewater from the flow control tank to perform aeration and microbial activation and discharge the treated water (supernatant) obtained upon completion of the performance. A reaction tank for repeating the exposure of the media to the outside and purifying the waste water from the flow regulating tank; Disinfection discharge tank for discharging to obtain the treated water discharged from the reaction tank; And Wastewater treatment apparatus using a biological medium, characterized in that it comprises a sludge concentration tank for obtaining sludge from the reaction tank to concentrate. The wastewater using biological media according to claim 1, wherein the biological media is microorganisms attached to a medium having any one of porous or broad surface areas formed of any one of ciliated or resin such as polyethylene resin or ceramic. Processing unit.

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