KR-102962870-B1 - WATER TREATMENT SYSTEM USING SUPPLYING ORGANIC MATTER TO DEGASSING TANK AND METHOD FOR OPERATING THE SAME

KR102962870B1KR 102962870 B1KR102962870 B1KR 102962870B1KR-102962870-B1

Abstract

According to the present invention, there is provided an anoxic tank in which nitrogen removal by denitrifying microorganisms is performed on water to be treated under anoxic conditions; an anaerobic tank in which phosphorus release by phosphorus-accumulating microorganisms is performed on anaerobic effluent discharged from the anoxic tank under anaerobic conditions; an aerobic tank in which phosphorus over-uptake by phosphorus-accumulating microorganisms and nitrogen oxidation by nitrifying microorganisms are performed on anaerobic effluent discharged from the anaerobic tank under aerobic conditions; an intermittent aeration tank that selectively operates under one of aerobic conditions and anoxic tank conditions for the aerobic effluent discharged from the aerobic tank; a membrane tank equipped with a membrane filtration device that filters and treats the intermittent aeration tank effluent discharged from the intermittent aeration tank; a treated water EC sensor that measures the electrical conductivity of the treated water discharged from the membrane filtration device; a degassing tank that lowers the dissolved oxygen concentration of the membrane tank effluent discharged from the membrane tank and removes nitrogen and phosphorus; and a water to be treated split injection unit that split-injects the water to be treated into the degassing tank. A water treatment system is provided that includes a control unit that controls the operation of a split injection unit for the water to be treated using the measured value of the treated water EC measured by the treated water EC sensor.

Inventors

김경인
김용진
이대영
유성인
김태영
정동환
최재일
김재영
박수명

Assignees

현대엔지니어링 주식회사
씨제이대한통운(주)
에이치엘에코텍 주식회사

Dates

Publication Date: 20260511
Application Date: 20241128

Claims (12)

An anaerobic tank in which nitrogen removal by denitrifying microorganisms is performed on the water to be treated under anaerobic conditions; An anaerobic tank in which phosphorus release by phosphorus-accumulating microorganisms occurs under anaerobic conditions with respect to the anaerobic tank effluent discharged from the above-mentioned anaerobic tank; An aerobic tank in which, under aerobic conditions, excessive phosphorus uptake by phosphorus-accumulating microorganisms and nitrogen oxidation by nitrifying microorganisms occur with respect to the anaerobic tank effluent discharged from the above anaerobic tank; An intermittent aeration tank that selectively operates under one of the aerobic conditions and an anaerobic conditions for the aerobic tank effluent discharged from the aerobic tank; A membrane tank equipped with a membrane filtration device that filters and treats the intermittent aeration tank effluent discharged from the above intermittent aeration tank; A treated water EC sensor for measuring the electrical conductivity of the treated water discharged from the above membrane filtration device; A degassing tank that lowers the dissolved oxygen concentration of the membrane tank effluent discharged from the above membrane tank and removes nitrogen and phosphorus; A divided injection unit for dividing and injecting the above-mentioned water to be treated into the above-mentioned degassing tank; and It includes a control unit that controls the operation of the split injection unit for the target water to be treated using the measured EC value of the treated water measured by the treated water EC sensor, and The above control unit uses the EC measurement value of the treated water based on the correlation between the nitrate nitrogen and electrical conductivity of the treated water to control the operation of the split injection unit of the treated water. Water treatment system.
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In claim 1, It further includes an external carbon source for injecting organic matter into the above degassing tank, and The above control unit controls the operation of the external carbon source using the C/N ratio of the water to be treated and the EC measurement value of the treated water. Water treatment system.
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An anoxic tank in which nitrogen removal by denitrifying microorganisms is performed on the water to be treated under anoxic conditions; an anaerobic tank in which phosphorus release by phosphorus-accumulating microorganisms is performed on the anaerobic tank effluent discharged from the anoxic tank under anaerobic conditions; an aerobic tank in which phosphorus over-uptake by phosphorus-accumulating microorganisms and nitrogen oxidation by nitrifying microorganisms are performed on the anaerobic tank effluent discharged from the anaerobic tank under aerobic conditions; an intermittent aeration tank that selectively operates under one of aerobic and anoxic conditions for the aerobic tank effluent discharged from the aerobic tank; an intermittent aeration tank blower that supplies air to the intermittent aeration tank; a membrane tank equipped with a membrane filtration device that filters and treats the intermittent aeration tank effluent discharged from the intermittent aeration tank; a treated water EC sensor that measures the electrical conductivity (EC) of the treated water discharged from the membrane filtration device; and lowering the dissolved oxygen concentration of the membrane tank effluent discharged from the membrane tank and nitrogen and phosphorus A method of operating a water treatment system comprising a degassing tank for removal, a water to be treated split injection unit for splitting and injecting the water to be treated into the degassing tank, and a control unit for controlling the operation of the water to be treated split injection unit. A first treated water EC measurement value verification step in which the control unit verifies the first treated water EC measurement value measured by the treated water EC sensor; A first nitrate nitrogen concentration estimation step in which the control unit estimates the nitrate nitrogen concentration of the treated water using the first treated water EC measurement value and calculates the first treated water nitrate nitrogen concentration estimate value; An organic matter requirement calculation step in which the control unit calculates the optimal organic matter requirement for removing nitrate nitrogen from the treated water according to the estimated value of the first treated water nitrate nitrogen concentration; A step for determining the necessity of influent water distribution, wherein the control unit determines the necessity of splitting the injection of the water to be treated into the degassing tank according to the optimal organic matter requirement; In the step of determining the necessity of influent distribution, if it is determined that divided injection of the water to be treated into the degassing tank is necessary, the control unit calculates the amount of water to be treated according to the optimal organic matter requirement; and The above control unit includes an inflow water injection step in which the above control unit controls the operation of the treatment target water split injection unit so that the treatment target water is injected into the degassing tank according to the treatment target water injection amount, and The first nitrate nitrogen concentration estimation step is performed by the control unit calculating the first nitrate nitrogen concentration estimate using the first treated water EC measurement value based on the correlation between the nitrate nitrogen and electrical conductivity of the treated water. Method of operating a water treatment system.
In claim 9, The above water treatment system further includes an external carbon source that injects organic matter into the degassing tank and whose operation is controlled by the control unit, and After the above-mentioned influent injection step is performed, the control unit performs a C/N ratio comparison step in which the C/N ratio of the water to be treated is compared with a reference value; In the above C/N ratio comparison step, if the C/N ratio is determined to be smaller than the reference value, the control unit confirms the second treated water EC measurement value measured by the treated water EC sensor in a second treated water EC measurement value confirmation step; A second nitrate nitrogen concentration estimation step in which the control unit estimates the nitrate nitrogen concentration of the treated water using the second treated water EC measurement value and calculates the second treated water nitrate nitrogen concentration estimate value; A second nitrate nitrogen concentration comparison step in which the control unit compares the set nitrate nitrogen concentration with the second treated water nitrate concentration estimate; In the case where the estimated value of the second treated water nitrate concentration in the second nitrate nitrogen concentration comparison step is confirmed to be greater than the set nitrate nitrogen concentration, the control unit calculates the amount of organic matter to be injected from the external carbon source tank to the degassing tank using the estimated value of the second treated water nitrate concentration in an external carbon source injection amount calculation step; and The control unit includes an external carbon source supply step in which the external carbon source is controlled so that organic matter is supplied from the external carbon source tank to the degassing tank according to the amount calculated in the external carbon source injection amount calculation step, and The second nitrate nitrogen concentration estimation step is performed by the control unit calculating the second nitrate nitrogen concentration estimate using the second treated water EC measurement value based on the correlation between the nitrate nitrogen and electrical conductivity of the treated water. Method of operating a water treatment system.
In claim 10, In the second nitrate nitrogen concentration comparison step, if it is confirmed that the estimated value of the second treated water nitrate concentration is not greater than the set nitrate nitrogen concentration, the control unit controls the external carbon source so that organic matter is not injected from the external carbon source into the degassing tank. Method of operating a water treatment system.
In claim 10, The above standard value is 3 people, Method of operating a water treatment system.

Description

Water treatment system using organic matter supply to a degassing tank and method for operating the same The present invention relates to water treatment technology, and more specifically, to a technology for supplying organic matter to a degassing tank to improve the denitrification performance of the degassing tank. As a technology related to the present invention, Registered Patent No. 10-0322947 describes a method for treating nitrogen in wastewater, comprising the steps of: introducing wastewater into a first anoxic tank to induce pre-denitrification by supplying an external carbon source and receiving internal recirculation from an aerobic tank; introducing wastewater discharged from the first anoxic tank into an aerobic tank to induce nitrification by supplementing insufficient alkali; introducing wastewater discharged from the aerobic tank into a second anoxic tank to induce post-denitrification by supplying an external carbon source; and introducing wastewater discharged from a degassing tank into a sedimentation tank to settle the sludge and separate it from the treated water, discharging the treated water to the outside and returning the sludge to the first anoxic tank or removing it to a sludge storage tank. FIG. 1 is a block diagram schematically illustrating the overall configuration of a water treatment system according to one embodiment of the present invention. FIG. 2 is a flowchart schematically illustrating a method of operating a water treatment system according to one embodiment of the present invention. Hereinafter, the configuration and operation of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram schematically illustrating the overall configuration of a water treatment system according to one embodiment of the present invention. Referring to FIG. 1, a water treatment system (200) according to one embodiment of the present invention comprises: a screen device (105) for removing foreign substances such as impurities from raw water (W0) to be treated; a pretreatment device (110) for removing fibers such as hair from water to be treated (W01) discharged from the screen device (105); a flow rate adjustment tank (115) for storing water to be treated (W02) discharged from the pretreatment device (110) and adjusting the flow rate to discharge it; an anoxic tank (120) for performing denitrification on water to be treated (W1) discharged from the flow rate adjustment tank (115); an anaerobic tank (125) for releasing phosphorus from an anaerobic tank effluent (W2) discharged from the anoxic tank (120); an aerobic tank (130) for performing nitrification and excessive phosphorus uptake on anaerobic tank effluent (W3) discharged from the anaerobic tank (125); and to the aerobic tank (130). An aerobic tank blower (132) that supplies air, an intermittent aeration tank (135) that is selectively operated under one of aerobic and anaerobic conditions for the aerobic tank effluent (W4) discharged from the aerobic tank (130), an intermittent aeration tank blower (137) that supplies air to the intermittent aeration tank (135), a membrane tank (140) that produces treated water (W6) by performing membrane filtration on the intermittent aeration tank effluent (W5) discharged from the intermittent aeration tank (135), a membrane tank blower (143) that supplies air to the membrane tank (140), a degassing tank (145) that lowers the dissolved oxygen concentration of the membrane tank effluent (W7) discharged from the membrane tank (140) and removes nitrogen and phosphorus, an external carbon source tank (148) that injects organic matter insufficient for removing nitrogen and phosphorus into the degassing tank (145), A treatment target water split injection unit (150) that splits and injects the treatment target water (W1) discharged from a flow rate adjustment tank (115) into an anoxic tank (120), an anaerobic tank (125), and a degassing tank (145); an internal return unit (155) that returns the degassing tank effluent (W8) discharged from the degassing tank (145) to an intermittent aeration tank (135) and a membrane tank (140); a sludge return unit (155a) that returns the degassing tank effluent (W8) discharged from the degassing tank (145) to the anoxic tank (120); a chemical supply unit (165) that supplies chemicals to the aerobic tank (130); a treatment water EC sensor (179) that measures the electrical conductivity (EC) of the treatment water (W6); and a treatment target water split to regulate the supply of organic matter to the degassing tank (145). It includes a control unit (190) that controls the operation of the injection unit (150) and the external carbon source (148). The screen device (105) removes foreign substances, such as impurities, from the raw water (W0) to be treated. Since the screen device (105) includes the configuration of a screen device commonly used in the field of water treatment technology, a detailed descr