[특허]Process for controlling the nitrification and denitrification phase

[미국특허] Process for controlling the nitrification and denitrification phase 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	C02F-003/30
출원번호	US-0013448 (1998-01-26)
우선권정보	DE-0002951 (1997-01-27)
발명자 / 주소	Bongards Michael,DEX
출원인 / 주소	WTW Wissenschaftlich-Technische Werkstatten GmbH, DEX
대리인 / 주소	Cantor Colburn LLP
인용정보	피인용 횟수 : 25 인용 특허 : 9

초록 ▼

The present invention concerns a process and a device for controlling and regulating the nitrification and denitrification phase in waste water treatment, the redox potential (U.sub.R) of the waste water being measured. In a first embodiment, the inflection point of the redox potential is determined statistically. For this a series of measurements of the redox potential are carried out at separate intervals of time, which measurements first are determined and then combined for determining an increase value. The difference between sequential increase values is compared, and a first switch signal (S1) is generated which contains information concerning this result. In a another embodiment, the difference of the redox potential (U.sub.R) between maximum and switching off the denitrification phase is determined and compared with the corresponding value of the previous measurement cycle. Depending on the comparison result, a second switch signal (S2) is generated. The switch signals (S1, S2) thus obtained also can be connected via a logic circuit, preferably a fuzzy logic, with one another for issuing switch signals (S.sub.D) at least for the ending of the denitrification time.

대표청구항 ▼

[ What is claimed is:] [1.] A process for controlling and regulating a nitrification and denitrification phase in a waste water treatment, the process comprising:measuring a redox potential (U.sub.R) of the waste water, the redox potential including an inflection point which is used for indication of the end of the denitrification phase;calculating an increase from at least two measurements of the redox potential, the at least two measurements being separated in time;storing the at least two measurements;comparing at least two sequential increase values of the redox potential with one another;generating a first switch-off signal (S1) based on the comparison between the at least two sequential increase values, the first switch-off signal for switching off the denitrification phase;detecting a maximum of the redox potential;detecting the redox potential for a period of time at a point where the denitrification phase is switched off;calculating a difference between the maximum redox potential and the redox potential for the period of time, the difference being representative of a present detection cycle;comparing the difference of the present detection cycle with the difference calculated in a previous detection cycle; andgenerating a second switch-off signal (S2) based on the comparison between the difference between the present and previous detection cycles, wherein the first and second switch-off signals (S1, S2) are used for switching off the denitrification phase.

이 특허에 인용된 특허 (9) 인용/피인용 타임라인 분석

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Lee Phillip G. (Galveston TX) Turk Philip E. (Galveston TX) Whitson John L. (Galveston TX), Controlled denitrification process and system.
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Okey Robert W. ; Martis Mary C., Environmental control for biological nutrient removal in water/wastewater treatment.
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Besten Hans-Werner,DEX, Method and arrangement for decomposing organic waste water pollutants.
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Lefevre Fanny (Poissy FRX) Audic Jean-Marc (Conflans Sainte Honorine FRX), Method of Regulating Aeration in a basin for bilogical treatment of wastewater.
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Nielsen Marinus K. (Virum DKX), Method of controlling waste water purification plants using multiple control functions.
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Stein Theodor (Kamen DEX), Process for biologically purifying waste waters.
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[미국특허] Process for controlling the nitrification and denitrification phase 원문보기

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