KR-20260067842-A - WASTEWATER TREATMENT SYSTEM AND WASTEWATER TREATMENT METHOD USING THE SAME

KR20260067842AKR 20260067842 AKR20260067842 AKR 20260067842AKR-20260067842-A

Abstract

A wastewater treatment system according to one embodiment comprises: an organic collection tank that receives wastewater discharged from a wastewater supply device and stores it as raw water; a first denitrification tank that converts nitrate nitrogen contained in the raw water into nitrogen gas and converts it into primary treated water; a nitrification tank that oxidizes ammoniacal nitrogen in the primary treated water and converts it into secondary treated water; and a carbon supply unit that supplies an organic carbon source, wherein the supplied organic carbon source includes: a second denitrification tank that removes residual nitrate nitrogen in the secondary treated water and converts it into tertiary treated water; a re-aeration tank that oxidizes residual ammoniacal nitrogen in the tertiary treated water into nitrate nitrogen and converts it into quaternary treated water; a sedimentation tank that separates the quaternary treated water into sludge and supernatant; a wastewater analysis unit disposed between the wastewater supply device and the organic collection tank and analyzes information of the wastewater discharged from the wastewater supply device; and, using the information of the wastewater analyzed by the wastewater analysis unit, calculates the supply amount of the organic carbon source, and It may include a control unit that controls the supply of the organic carbon source in an amount equal to the supply quantity.

Inventors

남창현
최근혁
이종엽
김건희
이광하

Assignees

삼성전자주식회사

Dates

Publication Date: 20260513
Application Date: 20241106

Claims (10)

An organic water collection tank that receives wastewater discharged from a wastewater supply device and stores it as raw water; A first denitrification tank that reduces nitrate nitrogen contained in the above raw water into nitrogen gas and converts it into primary treated water; A nitrification tank that oxidizes ammoniacal nitrogen in the above primary treated water and converts it into secondary treated water; A carbon supply unit for supplying an organic carbon source, wherein the supplied organic carbon source is used to remove residual nitrate nitrogen in the secondary treated water and convert it into tertiary treated water; A re-aeration tank that oxidizes the ammoniacal nitrogen remaining in the above tertiary treated water into nitrate nitrogen and converts it into quaternary treated water; A sedimentation tank for separating the above-mentioned 4th treated water into sludge and supernatant; A wastewater analysis unit disposed between the wastewater supply device and the organic water collection tank, which analyzes information on the wastewater discharged from the wastewater supply device; and A wastewater treatment system comprising a control unit that calculates the supply amount of the organic carbon source using the information of the wastewater analyzed by the wastewater analysis unit and controls the supply of the organic carbon source to be equal to the supply amount.
In paragraph 1, A wastewater treatment system comprising a wastewater supply unit that supplies wastewater to the first denitrification tank.
A wastewater analysis unit that analyzes information on wastewater discharged from a wastewater supply device; An organic water collection tank that receives the above wastewater and stores it as raw water; A first denitrification tank comprising a first analyzer for analyzing the NO3 concentration in the primary treated water, wherein the above raw water is introduced, the above raw water is converted into primary treated water by reducing the nitrate nitrogen contained in the said raw water to nitrogen gas; A nitrification tank comprising a second analyzer for analyzing the NH3 concentration in the primary treated water, into which the primary treated water is introduced, wherein the ammoniacal nitrogen in the primary treated water is oxidized and converted into secondary treated water; A second denitrification tank comprising a carbon supply unit that supplies an organic carbon source, into which the secondary treated water flows, wherein the secondary treated water is converted into tertiary treated water by removing residual nitrate nitrogen in the secondary treated water by the organic carbon source; A re-aeration tank comprising a third analyzer for analyzing NO3 concentration in the quaternary treated water, into which the tertiary treated water is introduced, wherein nitrogen gas in the tertiary treated water is degassed and residual ammoniacal nitrogen is oxidized to nitrate nitrogen to be converted into quaternary treated water; A sedimentation tank into which the above-mentioned quaternary treated water flows, and in which the above-mentioned quaternary treated water is separated into sludge and supernatant; and A wastewater treatment system comprising a control unit that calculates the amount of the organic carbon source to be supplied to the second denitrification tank using the information of the wastewater analyzed by the wastewater analysis unit, and controls the supply of the organic carbon source in the amount of the supply.
In paragraph 3, the control unit is, An analysis unit that analyzes the NH3 concentration of the raw water stored in the organic water collection tank using the information of the wastewater analyzed by the wastewater analysis unit; A calculation unit that calculates the supply amount of the organic carbon source to be supplied to the second denitrification tank using the NH3 concentration analyzed by the analysis unit above; and A wastewater treatment system comprising a supply amount control unit that controls the carbon supply unit so that the above organic carbon source is supplied in an amount equal to the calculated supply amount value.
In paragraph 4, the wastewater analysis unit is, A component analysis unit for analyzing the ratio of NH₃ in the wastewater; and A wastewater treatment system comprising a flow rate measuring unit for measuring the flow rate of the wastewater.
In paragraph 5, the above analysis unit, A wastewater treatment system that analyzes the NH3 concentration of the raw water using information on the ratio of NH3 in the wastewater, the flow rate of the wastewater, and the amount of raw water introduced into the organic collection tank.
In paragraph 6, the above-mentioned calculation unit is, A first calculation unit that calculates the NO3 concentration in the secondary treated water discharged from the nitrification tank using the NH3 concentration analyzed by the analysis unit; and A wastewater treatment system comprising a second calculation unit that calculates the supply amount of the organic carbon source required in the second denitrification tank using the NO3 concentration analyzed in the first calculation unit.
In paragraph 3, the control unit is, A wastewater treatment system further comprising a correction unit that corrects the supply amount of the organic carbon source calculated by the calculation unit when the NO3 concentration in the 4th treated water discharged from the above aeration tank deviates from a certain concentration range.
A wastewater analysis unit analyzes information about the wastewater discharged from the wastewater supply device; A step in which an organic water collection tank receives the wastewater and stores it as raw water; A first denitrification tank receives the raw water and converts the nitrate nitrogen contained in the raw water into nitrogen gas, thereby converting it into primary treated water; A step in which a nitrification tank receives the primary treated water and oxidizes the ammoniacal nitrogen in the primary treated water to convert it into secondary treated water; A step in which a second denitrification tank receives the secondary treated water and uses an organic carbon source to remove residual nitrate nitrogen in the secondary treated water and convert it into tertiary treated water; A step in which a re-aeration tank receives the tertiary treated water, degassses nitrogen gas within the tertiary treated water, and oxidizes the remaining ammoniacal nitrogen into nitrate nitrogen to convert it into quaternary treated water; A sedimentation tank receives the quaternary treated water and separates the quaternary treated water into sludge and supernatant; and A wastewater treatment method comprising a step in which a control unit controls the supply amount of the organic carbon source so that the organic carbon source is supplied to the second denitrification tank in the required amount.
In claim 9, the step controlled by the control unit is, A step in which an analysis unit analyzes the NH3 concentration of the raw water stored in the organic water collection tank using information on the wastewater analyzed by the wastewater analysis unit; A step in which an output unit calculates a value for the supply amount of the organic carbon source to be supplied to the second denitrification tank using the NH3 concentration analyzed by the analysis unit; and A wastewater treatment method comprising the step of a supply amount control unit controlling the carbon supply unit so that the organic carbon source is supplied in an amount equal to the calculated supply amount.

Description

Wastewater Treatment System and Wastewater Treatment Method Using the Same The present disclosure relates to a wastewater treatment system and a wastewater treatment method using the same. If wastewater is discharged into rivers without removing nitrogen components, a state of nutrient excess, or eutrophication , occurs. For example, when present alongside phosphate ( PO₄³⁻ ), it can be assimilated into cellular substances, leading to massive algal blooms; furthermore, the nitrification process consumes large amounts of oxygen, potentially causing oxygen deficiency. In particular, among nitrogen compounds, ammonia exhibits toxicity to aquatic organisms if present in amounts exceeding a certain threshold, and nitrate ions ( NO₃⁻ ) can generate carcinogens when combined with other substances. Consequently, water quality is managed by establishing standard limits for nitrogen. Biological wastewater treatment methods utilizing microorganisms are being used as a method for treating nitrogen in wastewater. This involves a process of converting ammonia nitrogen ( NH₃ -N) into nitrate nitrogen ( NO₃ -N) through organic processes. In particular, in the case of semiconductor wastewater, the concentration of ammonia nitrogen ( NH₃ -N) is high and the carbon concentration is low due to process characteristics; taking this into account, an external organic carbon source is introduced to control the nitrogen concentration. Generally, organic carbon sources are introduced into a post-denitrification tank located downstream of a nitrification tank. The amount of organic carbon source introduced is controlled by a feedback method based on the nitrate nitrogen ( NO₃ -N) concentration in the re-aeration tank following the post-denitrification tank. However, in reality, the above feedback method involves manual operation more than a certain number of times due to various variables, and there is a problem in that the number of quality deviations increases due to such manual operation. To solve the above problem, it is necessary to develop an automatic control system to control the input amount of organic carbon sources by reflecting various variables in real time. Figure 1 is a drawing illustrating a conventional wastewater treatment system. FIG. 2 is a drawing illustrating a wastewater treatment system according to one embodiment. FIG. 3 is a drawing illustrating the configuration of a wastewater treatment system in one embodiment. FIGS. 4 to 8 are flowcharts illustrated to explain a wastewater treatment method according to one embodiment. FIGS. 9 to 13 are drawings illustrating the effects of a wastewater treatment system according to one embodiment. Hereinafter, embodiments of the present disclosure are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present disclosure. The present disclosure may be embodied in various different forms and is not limited to the embodiments described herein. In order to clearly explain the present disclosure in the drawings, parts unrelated to the explanation have been omitted, and the same reference numerals have been used throughout the specification for identical or similar components. Furthermore, the size and thickness of each component shown in the drawings are depicted arbitrarily for convenience of explanation, and thus the present disclosure is not necessarily limited to what is illustrated. Thicknesses have been enlarged in the drawings to clearly represent various layers and regions. Additionally, in the drawings, the thickness of some layers and regions has been exaggerated for convenience of explanation. Throughout the specification, when a part is described as being "connected" to another part, this includes not only cases where they are "directly connected," but also cases where they are "indirectly connected" with other members in between. Furthermore, when a part is described as "including" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, when it is said that a part, such as a layer, membrane, region, or plate, is "on" or "on" another part, this includes not only the case where it is "directly above" the other part, but also the case where there is another part in between. Conversely, when it is said that a part is "directly above" another part, it means that there is no other part in between. Also, saying that a part is "on" or "on" a reference part means that it is located above or below the reference part, and does not necessarily mean that it is located "on" or "on" in the direction opposite to gravity. Additionally, throughout the specification, "planar" means when the subject part is viewed from above, and "cross-sectional" means when the cross-section obtained by vertically cutting the subject part is viewed from the side. Figure 1 is a drawing illustrating a conventional wastewater trea