KR100439572B1 - Nitrogen and phosphorus eliminating method and apparatus used microorganism - Google Patents

Abstract

PURPOSE: To effectively eliminate nitrogen and phosphorus from wastewater and stably maintain removal of phosphorus and nitrogen contained in wastewater by action of microorganisms. CONSTITUTION: The apparatus comprises a screen (100) for removing miscellaneous materials having high volume and weight in wastewater; a bio-adsorption tank (200) for adsorbing organic matter of the miscellaneous material removed wastewater onto microorganisms; first settling chamber (300) for discharging the settled sludge to one side by settling sludge containing the organic matter adsorbed microorganisms; a phosphorus emission tank (400) for emitting phosphorus under the anaerobic condition by moving the settled sludge only; a nitrification tank (500) for changing ammonia nitrogen into nitrate-nitrogen using nitrifying microorganisms in wastewater that is not settled; second settling chamber (600) for disusing excess sludge by returning settled sludge containing nitrifying microorganisms to the nitrification tank again; a denitrifying tank (700) for changing nitrate-nitrogen into nitrogen gas through denitrifying microorganisms in wastewater containing nitrate-nitrogen; a phosphorus absorption tank (800) for excessively absorbing phosphorus emitted from the phosphorus emission tank using phosphorus accumulating microorganisms; and third settling chamber (900) for returning some of sludge to the bio-adsorption tank and discharging excess sludge to the outside by settling microbial sludge into which phosphorus is excessively absorbed.

Description

Nitrogen and PHOSPHORUS ELIMINATING METHOD AND APPARATUS USED MICROORGANISM

The present invention relates to a method for simultaneously treating nitrogen and phosphorus using microorganisms and a treatment apparatus thereof, and more particularly, to remove contaminants in wastewater, and to separate the microbial adsorbed sludge and supernatant from the wastewater, It converts the ammonia nitrogen contained to nitrogen nitrate by using nitrifying microorganism and removes nitrogen gas and phosphorus from wastewater through denitrification microorganism and condensation microorganism, screen, biosorption tank for adsorbing microorganism to wastewater organic matter, , A first settling tank for settling sludge containing microorganisms, a phosphate tank for discharging phosphorus in an anaerobic bioreactor by moving the sludge settled in the first settling tank, and for changing ammonia nitrogen to nitrate nitrogen Nitrification tank, second settling tank, denitrification tank for converting nitrate nitrogen from wastewater into nitrogen gas, and wastewater It comprises a phosphorus absorption tank for absorbing phosphorus and solid-liquid separation of the final treated wastewater and sludge, and a third settling tank for discharging excess sludge, which increases wastewater treatment efficiency and shortens treatment time. The present invention relates to a method for simultaneously treating nitrogen and phosphorus using microorganisms and a treatment apparatus thereof.

As the current industry is advanced, the severity of environmental pollution has threatened human survival. Especially, the pollution of groundwater, rivers and seas caused by household sewage, factory wastewater, and livestock wastewater, as well as soil pollution is getting worse day by day. It is becoming a social problem, and much research and development and investment are being made to solve the problem.

In general, in order to remove nitrogen biologically, organic nitrogen and ammonia nitrogen in wastewater must be oxidized to nitrite nitrogen (NO2-N) and nitrate nitrogen (NO3-N) by nitrifying bacteria under aerobic conditions. These oxides (NO2-N, NO3-N) are treated by denitrification bacteria under anaerobic or anoxic conditions, and nitrogen gas (N2) is released from the atmosphere to remove nitrogen from the wastewater.

The removal of biological phosphorus can be removed through the cell synthesis of microorganisms. Specifically, the phosphorus release begins simultaneously with the storage of organic matter in the anaerobic conditions, and the disposal of excess sludge that accumulates cell growth and polyphosphate under aerobic conditions. do.

Therefore, in order to remove biological nitrogen and phosphorus, it is necessary to form anoxic (aerobic) and aerobic conditions, and the A2 / O method, UCT method, VIP, which are currently developed for this purpose VIP method) and SBR (SBR) method. Among these methods, Atoo method, UCT method and VIP method comprise anaerobic anaerobic-aerobic tank, and nitrogen removal is carried out by oxidation of ammonia nitrogen to nitric acid by microorganism in aerobic tank at the end of process. In addition, by using an internal transfer pump to transfer to an oxygen-free tank to reduce the nitrogen is removed, the removal of phosphorus is carried out by the excess intake of phosphorus discharged from the anaerobic tank of the front end of the process in the aeration tank of the rear end to discard the excess sludge.

However, when converting the processes such as A2O method, UCT and VIP into advanced treatment process for existing activated sludge tanks in Korea, there are problems such as securing residence time and limiting the amount of microorganisms in the reactor through sludge transfer. do.

Therefore, when retrofitting the devices used in the prior art activated sludge process, long-term aeration method, and catalytic oxidation method into a device capable of removing nitrogen and phosphorus collectively, it is difficult to remodel existing processes due to low utilization of the post-treatment facilities in use. A problem has occurred.

The purpose of the present invention to improve this is to make nitrogen and phosphorus removal in the wastewater effectively, and the simultaneous treatment of nitrogen and phosphorus using microorganisms to ensure the stable removal of phosphorus and nitrogen contained in the wastewater by microbial action And a processing apparatus thereof.

<Code Description of Main Parts of Drawing>

100: screen 200: biological adsorption tank

300: first settling tank 400: phosphorus discharge tank

500: nitrification tank 600: second precipitation tank

700: denitrification tank 800: suction tank

900: third settling tank 910: filtering tank

920: disinfection tank 930: sludge storage tank

In order to achieve the above object, the present invention, and to remove the contaminants in the wastewater,

A microorganism adsorption step of adsorbing organic matter from wastewater from which contaminants are removed to microorganisms,

A sludge separation step of separating sludge and supernatant containing microorganisms that adsorb organic matters from the wastewater to which microorganisms are adsorbed by precipitation;

A nitrification step of converting ammonia nitrogen to nitrate nitrogen using a high concentration of nitrifying microorganisms in the unprecipitated wastewater;

A phosphorus release step of releasing phosphorus from the precipitated microbial sludge in the sludge separation step,

A denitrification step of generating nitrate nitrogen as nitrogen gas using denitrification microorganisms from microbial sludge including wastewater containing nitrate nitrogen generated in the nitrification step and phosphorus released in the phosphorus release step;

Phosphorus absorption step of over-absorbing the phosphorus released in the phosphorus release step by using the accumulation microorganisms,

It comprises the excess sludge discharge step of sedimenting the excess sludge by sedimenting the microorganism sludge over-absorbed phosphorus.

In addition, the present invention, the screen for removing large volume and weight of impurities in the waste water;

A biological adsorption tank for adsorbing the organic matter of the wastewater from which the contaminants have been removed by the screen to microorganisms,

A first sedimentation tank for sedimenting and discharging the sludge containing the microorganisms adsorbing the organic matter to one side;

A phosphorous discharge tank that moves only the precipitated sludge to release phosphorus under anaerobic conditions;

A nitrification tank for converting ammonia nitrogen into nitrate nitrogen by using nitrifier microorganisms in non-precipitated wastewater;

A second settling tank for returning the sludge containing the precipitated nitrification microorganisms to the nitrification tank and disposing of the excess sludge;

A denitrification tank for converting nitrate nitrogen into nitrogen gas through denitrification microorganisms in wastewater containing nitrate nitrogen;

A phosphorus absorption tank for over-absorption of phosphorus released from the phosphorus discharge tank by using the accumulation microorganisms,

The precipitated microbial sludge overabsorbed phosphorus, and some of the sludge is returned to the biosorption tank, the surplus sludge is composed of a third settling tank for discharge.

In the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The following terms are terms set in consideration of functions in the present invention, which may vary depending on the intention or custom of the producer, and their definitions should be made based on the contents throughout the specification.

Hereinafter, the technical configuration of the present invention according to the accompanying drawings in detail as follows.

1 or 2, the screen 100, the biosorption tank 200 for adsorbing the organic matter of the waste water to the microorganism, and the first, second and third precipitation tanks 300 for depositing the sludge , 600, 900, phosphorus discharge tank 400, nitrification tank 500 for changing ammonia nitrogen into nitrate nitrogen, denitrification tank 700 for changing the nitrate nitrogen to nitrogen gas, and It is largely composed of a absorption tank 800 for excessive absorption.

At the front end of the bioadsorption tank 200, a screen 100 for removing contaminants is installed at the inlet through which the wastewater enters. And the biological adsorption tank 200, bar is installed in order to allow the organic matter to be adsorbed within the microorganisms in a short time, the time required to adsorb the organic matter to the microorganisms to maintain about 10-30 minutes, more time In order to shorten, a stirring apparatus may be provided.

In addition, the bioadsorption tank 200 is configured to adsorb the organic material by using the adsorption property of the microorganism to remove the organic material, and the organic material load is configured to be up to 25 kgBOD / m 3 · d.

In addition, the first settling tank 300 connected to the biological adsorption tank 200 to precipitate the sludge containing the microorganisms adsorbed organic material is precipitated sludge is moved to the phosphorus discharge tank 400 to precipitate the sludge containing the microorganisms. And the rest that is not precipitated is configured to move to the nitrification tank (500).

Here, the nitrification tank 500 for converting ammonia nitrogen into nitrate nitrogen by using nitrifier microorganisms in the non-precipitated wastewater, so that only nitrification occurs, a short time nitrification reaction occurs.

In addition, the denitrification tank 700 for changing nitrate nitrogen into nitrogen gas using denitrification microorganisms uses organic materials adsorbed in the bioadsorption tank 200 as a carbon source, thereby greatly increasing processing efficiency without supplying a separate carbon source. To do that.

For example, the wastewater passing through the biosorption tank 200 through the screen 100 is transferred to the first settling tank 300, after the sludge is precipitated, the sludge is sent to the phosphorus discharge tank 400, the supernatant is nitrification occurs Nitrogen tank 500 is sent to.

The wastewater passed through the nitrification tank 500 is transferred to the second settling tank 600 to be precipitated through the nitrification microorganism, and the nitrification tank 500 and the pumps and control valves are connected to be returned to the nitrification tank 500. The upper wastewater containing nitrate nitrogen is introduced into the denitrification tank 700.

Here, the second precipitation tank 600 is connected to the rear end of the nitrification tank 500 to precipitate the sludge produced in the nitrification process, the operator to control the concentration of ammonia nitrogen contained in the wastewater and sludge age (SRT) The pumps and the control valve are operated to partially draw, and some to be returned to the nitrification tank (500).

And, the microbial sludge precipitated in the first settling tank 300 to release the phosphorus from the phosphorus discharge tank 400 operating in a completely anaerobic to be moved to the denitrification tank 700, the first settling tank 300 and phosphorus Pumps and control valves are installed between the discharge tank 400 to move the microbial sludge, and the organic material adsorbed to the microorganism in the biological adsorption tank 200 is used as a carbon source of denitrification microorganisms.

At this time, the phosphorus absorption tank 800 is operated aerobic and allows the accumulation microorganism to excessively absorb the phosphorus discharged from the phosphorus discharge vessel 400 to remove the phosphorus, and the third precipitation tank 900 in the excess absorption of phosphorus One microbial sludge is settled, the excess sludge is discarded using pumps and control valves and the rest is returned.

In addition, a filtration tank 910 and a disinfection tank 920 may be further installed to be connected to the third settling tank 900 to improve the quality of the treated water.

In addition, each device described above is preferably made of a material of reinforced concrete, iron, stainless steel and synthetic resin system, each of the above devices may be further provided with an acid equipment and a stirring equipment, in which case the reaction rate is increased Can be performed more quickly.

In addition, the discharge pipes extending from the second settling tank 600 and the third settling tank 900 are in communication with each other, the sludge storage tank 930 so that the sludge discharged from each settling tank is disposed in a predetermined space as shown in FIG. ) Is installed.

Referring to the operation of the present invention made of such a configuration as follows.

First, the contaminants in the wastewater are removed, and the organic matter of the wastewater from which the contaminants are removed is adsorbed to the microorganisms, and the sludge and the supernatant containing the microorganisms adsorbing the organic matter are separated by precipitation.

At this time, the wastewater, which is not precipitated supernatant, converts ammonia nitrogen to nitrate nitrogen using high concentration of nitrifying microorganisms, releases phosphorus from the precipitated microbial sludge, and separates the precipitated nitrifying microorganisms from the nitrified wastewater. Some nitrification microorganisms are transferred to nitrification tanks to maintain proper microbial concentrations and some are disposed of as excess sludge.

Meanwhile, in the wastewater containing nitrate nitrogen, nitrate nitrogen is generated as nitrogen gas using denitrification microorganisms, and the phosphorus released in the wastewater is excessively absorbed using condensed microorganisms to precipitate microbial sludge and then precipitated sludge. Some of them are transferred to bioadsorption tanks and some are disposed of as excess sludge.

While the invention has been shown and described with respect to specific embodiments thereof, it will be appreciated that the invention can be variously modified and varied without departing from the spirit or scope of the invention as provided by the following claims. do.

Thus, according to the present invention, each device is installed in order according to a predetermined arrangement in order to maximize the wastewater treatment efficiency, and to improve the affinity with microorganisms at the same time to the stable wastewater treatment, there is an excellent effect that can be carried out in the actual site. .

Claims (5)

A debris removal step for removing debris in the wastewater; A microbial adsorption step of adsorbing the organic matter of the wastewater from which the contaminants are removed to the microorganism; A sludge separation step of separating sludge and supernatant containing microorganisms that adsorb organic matter in the wastewater to which microorganisms are adsorbed by precipitation; A nitrification step of converting ammonia nitrogen to nitrate nitrogen using a high concentration of nitrifying microorganisms in the non-precipitated wastewater; A phosphorus release step of releasing phosphorus from the precipitated microbial sludge of the sludge separation step; A denitrification step of generating nitrate nitrogen as nitrogen gas using denitrification microorganisms from microbial sludge containing wastewater containing nitrate nitrogen generated in the nitrification step and phosphorus released in the phosphorus release step; Phosphorus absorption step of over-absorbing the phosphorus released in the phosphorus release step using the accumulation of microorganisms; Simultaneous treatment of nitrogen and phosphorus using microorganisms, comprising the step of discharging excess sludge by precipitating the excess of phosphorus over the sludge. The method of claim 1, In the nitrification step, nitrogen and phosphorus using the microorganisms, characterized in that to separate the nitrified microorganisms precipitated in the nitrification wastewater, and to reuse the separated nitrification microorganisms. The method of claim 1, The excess sludge discharge step, the nitrogen and phosphorus simultaneous treatment method using a microorganism, characterized in that further comprising a recycling step for returning the remaining residue other than the precipitated excess sludge to the microorganism adsorption step. A screen 100 for removing bulky and heavy contaminants in the wastewater; A biological adsorption tank 200 for adsorbing the organic matter of the wastewater from which the contaminants are removed by the screen 100 to microorganisms; A first sedimentation tank 300 for discharging the sludge containing the microorganisms that adsorb the organic material to discharge to one side; Phosphorous discharge tank 400 for moving the precipitated sludge to release phosphorus under anaerobic conditions; A nitrification tank 500 for converting ammonia nitrogen into nitrate nitrogen using nitrifier microorganisms in non-precipitated wastewater; A second sedimentation tank 600 for returning sludge containing precipitated nitrification microorganisms back to the nitrification tank 500 to discard excess sludge; A denitrification tank 700 for converting nitrate nitrogen into nitrogen gas through denitrification microorganisms in wastewater containing nitrate nitrogen; A phosphorus absorbing tank 800 for excessively absorbing phosphorus released from the phosphorus emitting tank 400 using the accumulating microorganisms; Simultaneous treatment of nitrogen and phosphorus using microorganisms comprising a third settling tank 900 for discharging micro sludge that has excessively absorbed phosphorus and returning some sludge to a biosorption tank and discharging excess sludge. . The method of claim 4, wherein The filtration tank 910 and the disinfection tank 920 is further connected to the third settling tank 900 to improve the water quality of the treated water.