KR100465851B1 - Removal measure of Circulated Sequencing Batch Reactor with media containing zeolite for organic matters, nitrogen and phosphorus removal in sewage and waste waters - Google Patents

Abstract

The present invention relates to a method for removing organic matter, nitrogen, and phosphorus in a median circulating continuous batch reaction system containing zeolite, and more particularly, according to the type and concentration of contaminants in the influent. The automatic control of hydraulic residence time (HRT), dissolved oxygen (DO), and anaerobic / anaerobic conditions for each stage is effective for the removal of nitrogen and phosphorus in various kinds of wastewater as well as the treatment of high and low concentrations of organic matter. The main component of the media used as the microorganism carrier in the inside is composed of zeolite, which has excellent ion exchange ability, and the nitrification reaction proceeds rapidly with high adsorption power of ammonia nitrogen, thereby improving the total nitrogen removal rate, changing the inflow water and environmental conditions in the reactor. It is possible to suppress the detachment of adherent microorganisms that occur frequently. The present invention relates to a method for removing organic matter, nitrogen and phosphorus in a media filled cycle continuous batch reaction system containing zeolite.

The present invention provides a method for removing contaminants in wastewater by removing contaminants by supplying contaminated wastewater from an inflow water tank through an upper portion of a continuous batch reaction tank as an inflow pump, wherein wastewater is introduced into the continuous batch reactor. After the inflow step, the first anaerobic (anaerobic) condition step of excessively releasing phosphorus (P) after the wastewater inflow step and then removing the organic matter and nitrifying the ammonia, and after the first anoxic (anaerobic) condition step, A first aerobic condition step for excessive intake of (P), a second anoxic (anaerobic) condition step for denitrification to remove nitrated ammonia with N ₂ after the first aerobic condition step, and the second After the anaerobic (anaerobic) condition step, the second aerobic condition step is performed again to remove unreacted organic matter and to nitrate ammonia, and the After the second aerobic condition step, the discharge step of discharging the purified water from which the contaminants have been removed, and characterized in that it consists of a process of rest phase having a rest period for a predetermined time after the outflow step.

Description

Removal measure of Circulated Sequencing Batch Reactor with media containing zeolite for organic matters, nitrogen and phosphorus removal in sewage and waste waters}

The present invention relates to a method for removing organic matter, nitrogen, and phosphorus in a median circulating continuous batch reaction system containing zeolite, and more particularly, according to the type and concentration of contaminants in the influent. The automatic control of hydraulic residence time (HRT), dissolved oxygen (DO), and anaerobic / anaerobic conditions for each stage is effective for the removal of nitrogen and phosphorus in various kinds of wastewater as well as the treatment of high and low concentrations of organic matter. The main component of the media used as the microorganism carrier in the inside is composed of zeolite, which has excellent ion exchange ability, and the nitrification reaction proceeds rapidly with high adsorption power of ammonia nitrogen, thereby improving the total nitrogen removal rate, changing the inflow water and environmental conditions in the reactor. It is possible to suppress the detachment of adherent microorganisms that occur frequently. The present invention relates to a method for removing organic matter, nitrogen and phosphorus in a media filled cycle continuous batch reaction system containing zeolite.

In general, a continuous batch reactor is known as an efficient reactor capable of rapidly developing with the automation of control equipment to remove organic matter and nitrogen components in wastewater, and this reactor is capable of reacting and sedimentation with one reactor. It has the advantages of low cost, easy operation and the like, and its application to various wastewater treatments has been studied.

In addition, continuous batch reactors are being used in biological treatment processes to efficiently remove nitrogen and organics present in wastewater, and studies to increase the retention of microorganisms in order to speed up the removal of pollutants in the wastewater have been conducted. .

As part of this, studies have been conducted to increase the activity of adherent microorganisms by adding a medium such as polyurethane in a continuous batch reactor. However, biological treatment is a technique for treating wastewater using microorganisms, so that toxic substances and high concentrations of contaminants are When the inflow has a disadvantage that the treatment efficiency sharply deteriorates and takes a long time to recover, it is desired to improve the biological wastewater treatment technology using a continuous batch reactor that improves this disadvantage.

The present invention is to solve the problems described above, while removing the organic matter, nitrogen, phosphorus in the waste water while inflow → anaerobic / anaerobic → aerobic → anaerobic / anaerobic → aerobic → outflow → rest Depending on the pollutant type (pH, BOD, COD, TN, TP, NH ₃ -N) and the concentration of hydrodynamic residence time (HRT) and dissolved oxygen (DO) at each stage of aeration, non-aeration, inflow, outflow, and resting phase In addition, by automatically controlling the anaerobic / anaerobic state, it is a technical task to be effectively used for the removal of nitrogen and phosphorus in various kinds of wastewater as well as the treatment of high and low concentrations of organic matter.

In addition, the present invention is to install the two water level control device in a continuous batch reactor to automatically introduce a certain amount of inflow source water in order to supply an external carbon source in the anaerobic / anaerobic state, it is not necessary to supply a separate external carbon source It is technical problem to have.

The present invention provides a method for removing contaminants in wastewater by supplying contaminated wastewater from an inflow water tank as an inflow pump through an upper portion of a continuous batch reactor, the wastewater inflow step of introducing wastewater into the continuous batch reactor. After the first waste water inflow step, the phosphorus (P) is excessively released and then the organic matter removal and ammonia nitrification process to generate a first anoxic (anaerobic) condition step, and after the first anoxic (anaerobic) condition step, phosphorus (P) A first aerobic condition step of over-ingestion, a second anoxic (aerobic) condition step of denitrification to remove nitrated ammonia with N ₂ after the first aerobic condition step, and the second anaerobic (anaerobic) step After the condition step, the second aerobic condition step is performed again to remove the unreacted organic matter and nitrification of ammonia, and the second aerobic condition step. After the sexual condition step, characterized in that consisting of a discharge step of discharging the purified water from which the contaminants have been removed, and a rest step having a pause for a predetermined time after the discharge step.

1 is a continuous media filling cycle containing the zeolite containing the present invention

Schematic diagram of the equation reaction system.

Figure 2 is a continuous media filling cycle containing zeolite containing the present invention

A perspective view of the media in the reaction system.

<Explanation of symbols for main parts of drawing>

11: inflow water tank 12: continuous batch reactor

14: inflow pump 15: internal circulation pump

16a, 16b: first and second water level control device 17: diffuser device

18a ~ 18d: Solenoid Valve 19: Water Quality Sensor

20: backwash pump 21: nitrogen injection device

22: oxygen injection device 23: blower

24: automatic control device 100: media

Hereinafter, described in detail by the accompanying drawings as follows.

1 is a block diagram of a median-circulating continuous batch reaction system containing a zeolite applied to the present invention, which is used as a microorganism carrier to a predetermined height portion from the inner bottom surface of the continuous batch reactor 12, and the main component is composed of zeolite. It is excellent in the ion exchange capacity is loaded with a medium (100) to accelerate the nitrification reaction with a high adsorption power of ammonia nitrogen.

On one side of the inner surface of the continuous batch reactor 12, an air diffuser 17 for injecting air, acidity (pH), biochemical oxygen demand (BOD), chemical oxygen demand (COD), total nitrogen amount (TN), total phosphorus amount (TP), a water quality sensor 19 for detecting a total amount of ammonia nitrogen (NH ₃ -N) and generating a detection signal proportional thereto, and a first signal for detecting two levels of water level and generating a detection signal proportional thereto The second water level control devices 16a and 16b are provided at regular intervals.

Upper and lower sides of the continuous batch reactor 12 are provided with an internal circulation pump 15 for continuously circulating to prevent and evenly mix the sedimentation of raw water introduced into the reactor inside, and the continuous batch reactor 12 The contaminated waste water from the inflow water tank 11 is supplied as an inflow pump 14 through an upper portion of the wastewater, and the lower portion of the continuous batch reactor 12 wash water to wash the contaminants attached to the media 100. A backwash pump 20 for supplying backwash water) and a solenoid valve 18d for discharging purified water from which contaminants have been removed are provided.

Output stages of the first and second water level controllers 16a and 16b and the water quality sensor 19 depend on the type of contaminants (pH, BOD, COD, TN, TP, NH ₃ -N) and the concentration of the influent. An automatic control device 24 for automatically controlling hydrostatic residence time (HRT), dissolved oxygen (DO), and anaerobic / anaerobic state of each stage of aeration, non-aeration, inflow, outflow, and resting phase is connected. At the output of (24), solenoid valves (18a) (18b) (18c) are used to adjust the supply of nitrogen, oxygen, and air according to acidity, biochemical oxygen demand, chemical oxygen demand, total nitrogen amount, total phosphorus amount, and total ammonia nitrogen content. The solenoid valve 18a, 18b, 18c is connected to one side of the nitrogen injection device 21, the oxygen injection device 22, and the blower 23.

FIG. 2A is a perspective view of a media 100 introduced into a packed circulation continuous batch reaction system, and FIG. 2B is a cross-sectional view of FIG. 2A, which is firmly supported by an internal support 1 intersected in a "+" shape. A plurality of culture plates 3 are attached to the outer circumferential surface of the shell as an outer support 4, and a disk-shaped partition 5 is rounded inside the culture plate 3 at the center of the tube 2 longitudinal section. The water passage 6 is formed between the outer wall surface of the (2) and the partition 5, and is comprised.

The culture plate (2), the tubular body (2), the inner support (1), the outer support (4) and the partition (5) are roughly processed by surface processing, etc. in order to increase the surface area and improve adhesion. 50wt% ~ 95wt% and ceramic (zeolite or titanium dioxide) 50wt% ~ 5wt% are mixed and used as synthetic resin, polyvinyl chloride (PVC), low density polyethylene (LDPE), high density polyethylene ( High Density Polythylene (HDPE), Polypropylene (PP), Ethylene Vynyl Acetate (EVA), etc.

That is, if the media (100) having a large surface area to be contacted where the microorganisms, such as the continuous batch reactor 12, to be able to contact, the microorganisms are attached to the surface of the media (100) and grow, and the media (100) The microorganisms attached to the biomass form a biofilm, and the microorganisms forming the biofilm decompose organic matter in the wastewater.

In addition, the partition effect is caused by the thickness of the biofilm, which is divided into the inside and the outside of the biofilm, and the inside of the membrane blocks anaerobic permeation of oxygen, and the outside directly absorbs the oxygen to form an aerobic system.

In the above process, it plays a role of increasing the growth of microorganisms and the formation of biofilms. First, it is manufactured by mixing ceramics to help the growth of microorganisms, and the surface is roughly manufactured to maximize the adhesion of microorganisms, which has a characteristic of material. More and more microorganisms are attached with porosity, and a large number of inner supports (1), outer supports (4), culture plates (3) and partitions (5) with rough surfaces maximize the surface area.

Therefore, since the contact area is increased by the microorganisms attached innumerably when the water flow and the gaseous flow flow between the surfaces of the media 100 enclosed in the continuous batch reactor 12, organic matters contained in waste water are more effectively compared to the conventional method. It is decomposed and purified, and the partition 5 and the culture plate 3 are attached to the tubular body 2 by the external support 4 to form a "T", which filters the suspended matter in the wastewater of the shape and structure. In addition, the anaerobic and aerobic microorganisms are formed at the same time on the inside and the outside of the culture plate 3.

The present invention made as described above first operates the inlet pump 14 to supply the contaminated waste water stored in the inlet water tank 11 from the top of the continuous batch reactor 12 to introduce the water level of the introduced raw water continuously. In this case, when the introduced raw water reaches the position of the second water level control device 16b, the inflow pump 14 is automatically supplied by the automatic control device 24 by the level level signal of the second water level control device 16b. Will stop driving.

At this time, the water quality sensor 19 is the oxygen demand (BOD), chemical oxygen demand (COD), total nitrogen (TN), total phosphorus (TP), total ammonia nitrogen of the contaminated water introduced into the continuous batch reactor 12 (NH ₃ -N) is continuously detected and a detection signal proportional thereto is generated, and this detection signal is transmitted to the automatic control device 24 to read the data, and then aeration, non-aeration, inflow by the set program. Hydrostatic residence time (HRT), dissolved oxygen (DO), and anaerobic / anaerobic conditions are automatically controlled for each stage of the effluent, effluent, and resting phase.

In the automatic control device 24, oxygen demand amount (BOD), chemical oxygen demand amount (COD), total nitrogen amount (TN), total phosphorus amount (TP), and total ammonia nitrogen amount of contaminated water introduced into the continuous batch reactor 12 ( The solenoid valves 18a, 18b and 18c are controlled in accordance with the detection amount of NH ₃ -N) to provide nitrogen and oxygen supplied from the nitrogen injection device 21, the oxygen injection device 22 and the blower 23. And the amount of air is supplied to the optimum amount to suit the reaction, thereby removing the organic matter, nitrogen, phosphorus in the waste water by chemical reaction.

That is, the contaminated raw water introduced into the continuous batch reactor 12 removes organic matter, nitrogen, and phosphorus in the waste water through a continuous step of inflow → anaerobic / anaerobic → aerobic → anaerobic / anaerobic → aerobic → outflow → season. .

The primary purpose of the first step, anaerobic / anaerobic condition is for the excessive release of phosphorus (P), and acetate and other fermentation by-products produced by fermentation reaction in the anaerobic condition (short-chain fatty acid) acid) is absorbed and stored in the form of PB (poly-β-hydroxybutyrate) in the cell cell, and the microorganism must consume energy while anaerobicly ingesting dissolved organic matter and generating intracellular storage materials. do.

The energy needed in these anaerobic conditions is obtained by breaking the high energy phosphate bonds stored in long-chain inorganic polyphosphates (ATP), in which excess P is released from the cell.

In addition, in the first stage aerobic conditions, the removal of organic matter and the nitrification of ammonia occur and at the same time excessive intake of phosphorus (P) occurs.

In other words, organic removal mechanism

C ₆ H ₁₂ O ₆ + 6O ₂ → 6CO ₂ + 6H ₂ O ---------------------- Scheme (1)

The ammonia removal mechanism is a process in which ammonia nitrogen is oxidized to nitrite nitrogen and nitrate nitrogen by a nitrifying microorganism under aerobic conditions.

Ammonia oxidation

^{_{NH 4 + + 1.5 O 2 →}} NO 2 - + H 2 O + 2H + ---------------------- reaction (2)

Nitrite oxidation

^{_{NO 2 - + 0.5 O 2 →}} 2NO 3 - ----------------------------- Scheme 3

Overall reaction considering cell synthesis

^{_{NH 4 + + 1.83O 2 + 1.98}} HCO 3 - →

_{0.021 C 5 H 7 NO 2 +} 0.98NO 3 - + 1.041 H 2 O + 1.88H 2 CO 3 ------- Scheme 4

Is made of.

At this time, excessive ingestion of phosphorus (P) rapidly ingests phosphorus (P) dissolved in the wastewater in the aerobic area (stage) to resynthesize intracellular ETP (ATP). (PHB) is oxidized to carbon dioxide, water and new cells under aerobic conditions.

In addition, the two-stage anoxic (anaerobic) condition is a reaction of the one-stage aerobic condition and the denitrification reaction to remove the nitrified ammonia with N ₂ to remove.

That is, the denitration reaction is nitric acid as shown in the following reaction scheme (NO ₃ ^-) to nitrite (NO ₂ ^-) process and nitrite to change (NO ₂ ^-) the through two intermediate step of conversion to nitrogen gas Can be divided into

NO₃ ^-→ NO₂ ^-→ NO → N₂O → N₂------------------- Scheme (5)

Considering cell synthesis (methane is used as an external carbon source)

^{_{NO 3 - + 1.08CH 3 OH +}} 0.24H 2 CO 3 →

_{0.056C 5 H 7 NO 2 + 0.47N} 2 + 1.68H 2 O + HCO 3 - ------------ Scheme 6

At this time, the external carbon source acts as a nutrient required for denitrification by the denitrification microorganism as shown in Scheme (6). In general, the external carbon source currently uses methanol, but this requires additional costs due to drug injection. have. However, in the present invention, the external carbon source is to use the carbon source contained in the waste water, and in general, the concentration of influent organic matter in the waste water is 150-200 mg / L, so that no additional inflow of other carbon sources is required, resulting in an additional cost for chemical injection. It can be significantly reduced.

The next two-stage aerobic condition proceeds in the same process as in the one-stage aerobic condition to achieve removal of unreacted organic matter and nitrification of ammonia.

By this process, the removal status of the organic matter, nitrogen and phosphorus removal in the waste water is continuously grasped by the automatic control device 24 through the water quality sensor 19 and when the reference level set by the program is reached, the solenoid valve ( 18d) is opened for a predetermined time to discharge the purified water introduced into the continuous batch reactor 12, and discharged until the water level of the continuous batch reactor 12 reaches the second water level control device 16b, and then You have a break during the time.

Thereafter, when the idle period has elapsed, the above-described process is repeated by driving the inflow pump 14 again to introduce the waste water stored in the inflow water tank 11 to the level of the first water level control device 16a.

(Example)

In the following implementation, the acidity, organic matter, nitrogen, and phosphorus content contained in the wastewater are shown in Table 1, and the results of the treatment under the same working conditions as shown in Table 2 are shown in Table 3.

(Table 1) Wastewater Quality Characteristics

Item Concentration pH 7.0-8.0 COD 200 NH ₄ ⁺ -N 30-35 NO ₂ -N 0 NO ₃ -N 0 T-P 6-8 Alkalinity (as CaCO ₃₎ 250-300

(Table 2) Working conditions

3 93 343 433 683 690 720

inflow Anaerobic / anaerobic Aerobic Anaerobic / anaerobic Aerobic exhaust Rest period Stage 1 Tier 2

(min)

3 90 250 90 250 7 30

Table 3 Experimental Results

Item Removal efficiency lowest Best Average COD 93.8 99.6 97.9 NH ₄ ⁺ -N 86.3 99.8 95.5 T-N 60.5 89.8 80.5 T-P 33.1 86.7 67.8

As shown in the above examples, the removal efficiency of organic matter, nitrogen, and phosphorus was found to be significantly higher than that of any batch reactor.

As described above, the present invention removes organic matter, nitrogen, and phosphorus from wastewater, while passing through a continuous step of inflow → oxygen / anaerobic → aerobic → aerobic / aerobic → aerobic → effluent → pause. (pH, BOD, COD, TN, TP, NH ₃ -N) and hydrodynamic residence time (HRT), dissolved oxygen (DO), oxygen free / anaerobic for each stage of aeration, non-aeration, inflow, outflow, and rest, depending on concentration By controlling the state automatically, it is effective not only in the treatment of high and low concentrations of organic matter, but also in the removal of nitrogen and phosphorus in various kinds of wastewater.

In addition, the present invention is to install two water level control device in a continuous batch reactor to automatically introduce a certain amount of inflow water in order to supply an external carbon source in the anaerobic / anaerobic state, so that the supply of additional external carbon source is not necessary. There is an effect that can contribute to savings.

Claims (2)

In the method of removing contaminants in waste water by supplying the contaminated waste water from the inflow water tank as an inflow pump through the upper portion of the continuous batch reactor, A wastewater inflow step of introducing wastewater into the continuous batch reactor; A first anaerobic (anaerobic) condition step of excessively releasing phosphorus (P) after the wastewater inflow step and then removing the organic matter and nitrifying the ammonia, After the first anaerobic (anaerobic) condition step, the first aerobic condition step to ingest excess phosphorus (P), After the first aerobic condition step, a second anoxic (anaerobic) condition step of denitrification to remove the nitrified ammonia with N ₂ , A second aerobic condition step of performing the first aerobic condition step again after the second anoxic (anaerobic) condition step to remove unreacted organic matter and nitrification of ammonia, After the second aerobic condition step, the discharge step of discharging the purified water from which the contaminants have been removed; Method of removing organic matter, nitrogen, phosphorus in the median circulating continuous batch reaction system containing zeolite, characterized in that the process of the resting step having a rest period for a certain time after the outflow step. The method of removing organic matter, nitrogen and phosphorus in the median circulating continuous batch reaction system containing zeolite according to claim 1, wherein the carbon source required in the first aerobic condition step uses a carbon component contained in waste water.