AU663341B2 – Method of controlling wastewater purification plants using quality evaluation of measuring data
– Google Patents
AU663341B2 – Method of controlling wastewater purification plants using quality evaluation of measuring data
– Google Patents
Method of controlling wastewater purification plants using quality evaluation of measuring data
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Publication number
AU663341B2
AU663341B2
AU27638/92A
AU2763892A
AU663341B2
AU 663341 B2
AU663341 B2
AU 663341B2
AU 27638/92 A
AU27638/92 A
AU 27638/92A
AU 2763892 A
AU2763892 A
AU 2763892A
AU 663341 B2
AU663341 B2
AU 663341B2
Authority
AU
Australia
Prior art keywords
measurement
value
basis
plant
expected
Prior art date
1991-10-01
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
AU27638/92A
Other versions
AU2763892A
(en
Inventor
Marinus Kristian Nielsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kruger Off-Shore AS
Original Assignee
KRUEGER I SYSTEMS AS
I Kruger Systems AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1991-10-01
Filing date
1992-10-01
Publication date
1995-10-05
1992-10-01
Application filed by KRUEGER I SYSTEMS AS, I Kruger Systems AS
filed
Critical
KRUEGER I SYSTEMS AS
1993-05-03
Publication of AU2763892A
publication
Critical
patent/AU2763892A/en
1995-10-05
Application granted
granted
Critical
1995-10-05
Publication of AU663341B2
publication
Critical
patent/AU663341B2/en
2008-07-17
Assigned to KRUGER OFF-SHORE A/S
reassignment
KRUGER OFF-SHORE A/S
Alteration of Name(s) in Register under S187
Assignors: I. KRUGER SYSTEMS AS
2012-10-01
Anticipated expiration
legal-status
Critical
Status
Expired
legal-status
Critical
Current
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Classifications
G—PHYSICS
G05—CONTROLLING; REGULATING
G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
G05D21/00—Control of chemical or physico-chemical variables, e.g. pH value
G05D21/02—Control of chemical or physico-chemical variables, e.g. pH value characterised by the use of electric means
C—CHEMISTRY; METALLURGY
C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F3/00—Biological treatment of water, waste water, or sewage
C02F3/006—Regulation methods for biological treatment
G—PHYSICS
G05—CONTROLLING; REGULATING
G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
G05B21/00—Systems involving sampling of the variable controlled
G05B21/02—Systems involving sampling of the variable controlled electric
C—CHEMISTRY; METALLURGY
C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F2209/00—Controlling or monitoring parameters in water treatment
C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
C—CHEMISTRY; METALLURGY
C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F2209/00—Controlling or monitoring parameters in water treatment
C02F2209/15—N03-N
C—CHEMISTRY; METALLURGY
C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F2209/00—Controlling or monitoring parameters in water treatment
C02F2209/18—PO4-P
C—CHEMISTRY; METALLURGY
C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F2209/00—Controlling or monitoring parameters in water treatment
C02F2209/22—O2
C—CHEMISTRY; METALLURGY
C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F2209/00—Controlling or monitoring parameters in water treatment
C02F2209/22—O2
C02F2209/225—O2 in the gas phase
C—CHEMISTRY; METALLURGY
C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F2209/00—Controlling or monitoring parameters in water treatment
C02F2209/40—Liquid flow rate
C—CHEMISTRY; METALLURGY
C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
C02F2209/00—Controlling or monitoring parameters in water treatment
C02F2209/44—Time
Abstract
PCT No. PCT/DK92/00291 Sec. 371 Date Mar. 22, 1994 Sec. 102(e) Date Mar. 22, 1994 PCT Filed Oct. 1, 1992 PCT Pub. No. WO93/07089 PCT Pub. Date Apr. 15, 1993A method of controlling a wastewater purification plant comprises the steps of measuring two or more of a number of parameters, automatically controlling the plant on the basis of the measurement values obtained using a mathematical model for the purification process, evaluating the quality of the measurement value for at least one parameter on the basis of a comparison of the said value with an expected, dynamic value interval calculated continuously on the basis of said mathematical model and a simultaneous and/or a previous measurement of one or several other parameters and/or a previous measurement of the same parameter, and controlling the plant on the basis of the quality evaluated measurement values.
Description
~r~
I
1. 3PI DATE 03/05/93 AOJP DATE 08/07/93 APPLN. ID 27638/92AU9227638 PCT NUMBER PCT/DK92/00291 1 li AU9227638 INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (51) International Patent Classification 5 C02F 1/00, 3/00 (11) International Publication Number: Al (43) International Publication Date: WO J7089 15 April 1993 (15.04.93) (21) International Application Number: (22) International Filing Date: Priority data: 1677/91 1 Octobel PCT/DK92/00291 1 October 1992 (01.10.92) r 1991 (01.10.91) (81) Designated States: AT, AU, BB, BG, BR, CA, CH, CS, DE, DK, ES, FI, GB, HU, JP, KP, KR, LK, LU, MG, MN, MW, NL, NO, PL, RO, RU, SD, SE, US, European patent (AT, BE, CH, DE, DK, ES, FR, GB, GR, IE, IT, LU, MC, NL, SE), OAPI patent (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, SN, TD, TG).
Published With international search report.
In English translation (filed in Danish).
66334 1 (71) Applicant (for all des!gnated States except US): I. KRUGER SYSTEMS A/S [DK/DK]; Gladsaxevej 363, DK-2860 Soborg (DK).
(72) Inventor; and Inventor/Applicant (for US only) NIELSEN, Marinus, Kristian [DK/DK]; Kollemosevej 47, DK-2830 Virum
(DK).
(74) Agent: LEHMANN REE A/S; Grundtvigsvej 37, DK- 1864 Frederiksberg C (DK).
(54) Title: METHOD OF CONTROLLING WASTEWATER PURIFICATION PLANTS USING QUALITY EVALUATION OF MEASURING DATA (57) Abstract A method of controlling a wastewater purification plant comprises the steps of measuring two or more of a number of parameters, automatically controlling the plant on the basis of the measurement values obtained using a mathematical model for the purification process, evaluating the quality of the measurement value for at least one parameter on the basis of a comparison of the said value with an expected, dynamic value interval calculated continuously on the basis of said mathematical model and a simultaneous and/or a previous measurement of one or several other parameters and/or a previous measurement of the same parameter, and controlling the plant on the basis of the quality evaluated measurement values.
WO 93/07089 PCT/DK92/00291 Method of controlling waste water purification plants nsging quality eva3luatin of meanurinng r9a-a The present invention relates to a method of controlling a waste water purification plant o the steps of measuring two or -For eusea e more of a number of parameters, such the concentration of ammonium, nitrate, oxygen and phosphate and oxygen supply, and automatically controlling the plant on the basis of the measurement values obtained using a mathematical model for the purification process.
When treating e.g. municipal waste water, where a removal of nitrogen and phosphate containing compounds and organic matter is typically desired, in a biological purification plant considerable variations occur during a day both in the concentration of the polluting substances in the waste water and in the amount of waste water supplied to the purification plant. The great variation in the load of the plant makes heavy demands on the control of the plant in order to avoid that the concentration of the polluting substances in the effluent exceeds the maximum limit values.
The control of biological purification plants is typically based on measurements of primarily phosphate, nitrate, ammonium and oxygen j carried out with photo or electro chemical electrodes (sensor systems). Such sensor systems are very sensitive and require continuous maintenance and frequent calibration, in particular in connection with measurements carried out in liquid mixtures from biological purification plants, which i.a. is due to the fact that such liquid mixtures contain many interfering substances, and that the particles and active sludge contained therein give rise to bacterial growth in the sensor systems as well as clogging thereof. 1 As a result thereof, measurements carried out using sensors, and in particular the measurements of nitrate and ammonium, are very unreliable and present a central problem in the control of biological purification plants.
J -“Computer Control of an Alternating Activated Sludge Process” by S Kimmel M. and Nielsen published at The International Symposium -r WO 93/07089 2 PCT/DK92/00291 on Process Systems Engineering, Kyoto, August 23-27, 1982 discloses a method of controlling a biological purification plant comprising two treatment tanks which are alternately operated in anoxic and aerobic conditions and wherein the flow pattern is changed accordingly and so that the untreated waste water is supplied to the anoxic tank, from which it is carried to the aerobic tank and therefrom further on in the plant to a clarification tank in which a sedimentation of active sludge is carried out, which sludge is subsequently recycled in the plant for introduction into the anoxic tank, and from which clarification tank the effluent is discharged.
The control is effected by means of a computer collecting the measurement results, analyzing said results on the basis of a mathematical model and implementing new control strategies.
In the said prior art method, measurements of oxygen, ammonium and nitrate are carried out using suitable sensors, the control parameters used being the oxygen supply rate and the nitrification and denitrification period ratio.
In the prior art method, the measurements of ammonium and nitrate concentrations are used continuously to determine the corresponding optimum oxygen concentration (the set point) during the nitrification and denitrification processes, respectively.
Furthermore, the nitrification and denitrification period ratio is controlled relative to the content of ammonium in the untreated waste water, i.e. such that the nitrification period is prolonged when the ammonium load is high and shortened
