KR-102962875-B1 - WATER TREATMENT SYSTEM USING INTERNAL RECYCLE FROM DEGASSING TANK AND METHOD FOR OPERATING THE SAME

KR102962875B1KR 102962875 B1KR102962875 B1KR 102962875B1KR-102962875-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 anoxic 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 anoxic tank 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 aerobic tank effluent discharged from the aerobic tank; a membrane tank equipped with a membrane filtration device that filters and treats 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; and a degassing tank that lowers the dissolved oxygen concentration of membrane tank effluent discharged from the membrane tank and removes nitrogen and phosphorus. A water treatment system is provided comprising: an internal return unit that returns the degassing tank effluent discharged from the degassing tank to the intermittent aeration tank; and a control unit that controls the operation of the internal return unit using the treated water EC measurement value 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 (8)

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; An internal return unit for returning the degassing tank effluent discharged from the above degassing tank to the above intermittent aeration tank; and It includes a control unit that controls the operation of the internal return unit using the treated water EC measurement value measured by the treated water EC sensor, and The control unit above 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 internal return unit, 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 a device that lowers the dissolved oxygen concentration of the membrane tank effluent discharged from the membrane tank. A method of operating a water treatment system comprising a degassing tank, an internal return unit that returns degassing tank effluent discharged from the degassing tank to the intermittent aeration tank, and a control unit that controls the operation of the internal return unit. A step for checking the EC setting value of the processing water, in which the above control unit checks the EC setting value of the processing water; A step for verifying the EC measurement value of the treated water in which the control unit verifies the EC measurement value of the treated water measured by the treated water EC sensor; and The above control unit includes an internal return necessity determination step for determining the necessity of internal return of the degassing tank by the internal return unit, The step of determining the necessity of internal recirculation is performed by the control unit determining whether to operate the internal recirculation unit using the treated water EC measurement value measured by the treated water EC sensor based on the correlation between the nitrate tank and electrical conductivity of the treated water. Method of operating a water treatment system.
In claim 5, An internal return operation step in which, when the EC measurement value of the treated water is greater than the EC setting value of the treated water in the internal return necessity determination step, the control unit operates the internal return unit; and If the above-mentioned treated water EC measurement value is not greater than the above-mentioned treated water EC setting value, the control unit further includes an internal return suspension step in which the internal return unit is not operated. Method of operating a water treatment system.
In claim 5, In the step of determining the necessity of internal return, if the measured value of the treated water EC is greater than the set value of the treated water EC, the control unit further includes an internal return ratio calculation step in which the control unit calculates the internal return ratio based on the measured value of the treated water EC. The above internal return operation step is performed according to the above internal return ratio, Method of operating a water treatment system.
In claim 5, The above control unit further includes a nitrate nitrogen concentration estimation step in which it calculates an estimated nitrate nitrogen concentration value corresponding to the measured EC value of the treated water based on the correlation between nitrate nitrogen and EC. Method of operating a water treatment system.

Description

Water treatment system using internal recycle from degassing tank and method for operating the same The present invention relates to water treatment technology, and more specifically, to internal recirculation control technology for a degassing tank. As the background technology of the present invention, Registered Utility Model No. 20-0344882 describes an advanced treatment system for removing nitrogen and phosphorus, comprising an anoxic tank, an anaerobic tank, a contact oxidation tank, a membrane separation tank, a sedimentation degassing tank, and a return means for returning the degassed sludge from the sedimentation degassing tank to the anoxic tank. Furthermore, Registered Patent No. 10-1871931 describes an integrated nitrogen control system for wastewater treatment facilities that controls internal recirculation by measuring nitrate nitrogen in the treated water. However, with this conventional configuration, effective control of internal recirculation is difficult if a problem occurs with the measurement of nitrate nitrogen. 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), and A treatment target water split injection unit (150) that splits and injects the treatment target water (W1) discharged from the 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 the intermittent aeration tank (135) and the 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 an internal return from the degassing tank (145) to the intermittent aeration tank (135). It includes a control unit (190) that controls the operation of the internal return unit (155) to control it. 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 description thereof is omitted here. The water to be treated (W01) discharged from the screen device (105) flows into the pretreatment device (110). The pretreatment device (110) removes hair-like fibers from the