CA2005869A1 - Method for continuous monitoring of effluent - Google Patents
Method for continuous monitoring of effluentInfo
- Publication number
- CA2005869A1 CA2005869A1 CA002005869A CA2005869A CA2005869A1 CA 2005869 A1 CA2005869 A1 CA 2005869A1 CA 002005869 A CA002005869 A CA 002005869A CA 2005869 A CA2005869 A CA 2005869A CA 2005869 A1 CA2005869 A1 CA 2005869A1
- Authority
- CA
- Canada
- Prior art keywords
- effluent
- oxygen
- bacteria
- stream
- measuring
- Prior art date
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 11
- 238000012544 monitoring process Methods 0.000 title claims abstract description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 29
- 239000001301 oxygen Substances 0.000 claims abstract description 29
- 241000894006 Bacteria Species 0.000 claims abstract description 28
- 239000010802 sludge Substances 0.000 claims abstract description 17
- 239000000725 suspension Substances 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 239000000470 constituent Substances 0.000 claims abstract description 6
- 230000015556 catabolic process Effects 0.000 claims abstract description 5
- 238000006731 degradation reaction Methods 0.000 claims abstract description 5
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 230000036284 oxygen consumption Effects 0.000 abstract description 6
- 239000000523 sample Substances 0.000 description 6
- 230000005764 inhibitory process Effects 0.000 description 4
- 230000036961 partial effect Effects 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 230000001580 bacterial effect Effects 0.000 description 2
- 238000005352 clarification Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 235000015097 nutrients Nutrition 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- BSYNRYMUTXBXSQ-UHFFFAOYSA-N Aspirin Chemical compound CC(=O)OC1=CC=CC=C1C(O)=O BSYNRYMUTXBXSQ-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241001517310 Eria Species 0.000 description 1
- 101000610605 Homo sapiens Tumor necrosis factor receptor superfamily member 10A Proteins 0.000 description 1
- 102100040113 Tumor necrosis factor receptor superfamily member 10A Human genes 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000002844 continuous effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000000266 injurious effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1806—Biological oxygen demand [BOD] or chemical oxygen demand [COD]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1826—Organic contamination in water
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
-
- 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
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- 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
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- 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
- C02F2209/20—Total organic carbon [TOC]
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
- G01N33/1826—Organic contamination in water
- G01N33/1846—Total carbon analysis
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Pathology (AREA)
- Biochemistry (AREA)
- Food Science & Technology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Medicinal Chemistry (AREA)
- Immunology (AREA)
- Molecular Biology (AREA)
- Analytical Chemistry (AREA)
- General Health & Medical Sciences (AREA)
- Microbiology (AREA)
- Automation & Control Theory (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Biomedical Technology (AREA)
- Emergency Medicine (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Activated Sludge Processes (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
Abstract of the disclosure Method for continuous monitoring of effluent In order to protect the biologically operating stage of an effluent treatment plant from interference due to the effluent, the effluent must be continuously monitored for water constituents which interfere with degradation and inhibit bacteria. For this purpose, a part-stream of the effluent is passed to a measurement, by means of which one of the total pollution parameters such as COD, TOC or BOD is determined. A second part-stream is mixed with oxygen-rich bacteria sludge suspension, the mixture is fed to an oxygen-measuring section and the oxygen deple-tion .DELTA.pO2 is measured. A dimensionless oxygen consumption number which is substantially independent of the load fluctuations and is specific to the effluent, is deter-mined from the oxygen depletion and the value of the total pollution parameters.
Description
HOECHST AKTIENGES~LLSCHAFT HOE 88/F 368 DPh.HS/rh Description N~thod for ~o~tinuous monitoring of effluent The invention relate~ to a method for continuou~ monitor-ing of effluent for watex constituents which interfere with degradation and inhibi~ bacteria, by measuring the oxygen depletion o a bacteria sludge suspension with added effluent.
In view of the generally large numb~r of the effluent discharge ~ources connected to a treatment plantl and the a~sociated diversity of the water con~tituent~, effects cannot be excluded which are caused by inhibitors in the effluenk. The changing composition and concentration of the water constituents in the affluent inflow to a treatment plant can, under some circumstances, al80 lead to an inhibition of the bacterial activity, caused by synergistic effects. In order to protect the biologically operating stage of the treatment plant from ~uch i~ter-ferences due to effluent, countermea~ures must ~e taken in good tLme. However, this reguires appropriate monitor-ing of effluent even up~tream of the trea~ment plant. For this purpose, so-called toximeters are used which func-tion intermittently or continuously with sassile or suspended bacteria.
DE 2,728,071 C2 has disclosed a toximeter method, in which, for detecting water con~tituents injurious to bacteria, a mixture of effluent and oxygen-enriched bacteria sludge i8 continuously pas~ed to an oxygen-mea~uring ~ec~ion and the oxygen depletion i~ deter~i~ed ~y measuring the oxygen partial pre66ure at the ~kart and at t~e end of the measuring ~ection.
~he interpretation of the mea~ured osygen consumption cause~ difficultles. Even i~ parameters such as the p~, temperature, bacteria mas~ and ef~luent rate are kept ~V~
~ 2 --constant, the concentration of the water constituents and henc~ the oxygen depletion vary continually, so that a decrease in oxygen consumption can be due either ~o reduced loading or to an inhibiting efflect. In order to obtain unambiguous information, the inflow of effluent is in~errupted and nutrient solution, the oxygen demand of which is known, is fed instead. If reduced oxygen deple-tion i~ then also foundr ît is certain that the effluent exerts an inhibiting effect. Especially in the case of frequently varying effluent loading, this method is tedious and very laborious. This is ~o be remedied by the i~ventionO
Accordingly, the invention i8 based on the ob~ect of providing a method, by mean~ of which the oxygen dep:le-}5 tion can be assigned unambiguously to an inhibition o the bacterial activityt independently of the effluent loading.
Th~ object is achieved by a method of the type de~cribed at the outset, which comprises passing a part-stream of the effluent to a measurement, by means of which one of the total pollution parameters such as COD, TOC or BOD is determined, mixing a second part-stream of the effluent with an oxygen-rich bacteria sludge ~uspen~ion, feeding a constant rate of the mixture to an oxygen-measuring section, measuring the oxygen depletion ~PO2 and deter-mining the specific oxygen depletion ~PO2 net from ~he oxygen depletion and the value of the total pollution parameter.
The effluent/bacteria sludge suspension rate ratio can be wîthin the lLmits 1:5 to 1:100. l'he second part-stream of the effluent should be mixed with the bacteria sludge as closely a6 po~sible to the entry to the o~ygen-~easuring ~ection. Particularly good result~ are obtained if the bacteria sludge is used at a constant concentration, namely at a dry matter content from 1 to 10 g/l, a t~mperature between 10 and 4S~C, a pH from 5 to 9 and, at r~ 9 the 2ntry to the measuring section, an o.~ygen content of ~3 mg/l. In order to ensure adequate mixing of effluent and bacteria sludge suspension, it is ~ufficient for ~he mixture to flow through the tesk section at 0.1 to 5 m/minute, 60 that the residence tlTne in the test ~ection then amount~ to 0.2 to 10 minutes/m.
The advantages achieved by the invention are to be seen especially in the fact that reduced specific oxygen depletion is substantially independent of the degree of pollution of the efflu~nt and can thus be assigned unambiguously to an inhibition of or damage to the bacteria.
The invention is explained in more detail below by reference to a flow diagram ~Fi~lre), which is intencled to repre8ent an illustrative example.
Effluent is contlnuously taken from the incoming s~wer of the biological treatment plant and passed via li~e 9 to the apparatus for monitoring the effluent for water constituenk~ which interfere with degradation an~ inhibit bacteria. This apparatss contain~, inter alia~ an analy-tical instrument ~2 for continuou61y me~6uring one of ~he total pollution parameters Q, such as chemical oxygen demand (COD), total organic carbon (TOC) or biolvgical oxygen demand (BOD) ! a measuring section compri~ing measuring probes 18, 19 and a re~idence time ~ection 20.
The measuring section 1~, 19, 20 is part of a circulation co~prising a ~tock and preparation tank 1 fsr the bac-teria sludge, a pum~ 16, a pipe 17, the measuring section 18, 19, 20 and a pipe 21. The ~tock and praparation tank 1 is provided with a final clarification part, which i~
separated from the activatin~ part by a partition 6 and has an overflow we~r 7~ The analytical instrument 22 and the mea~uring ~ection 18, 19, 20 are co~nected to a measuring value-proces~ing and data-output device 23 (8hown in dashed line ) which output~ the measured value~
28, 29 which have been determined. In the stock and preparation tank 1, oxygen and/or ai.r is added to the bacteria ~ludge via line 4 and the gas distributor 5, chemicals for adjusting the pH to values from 5 to 9 are added via line 3 andl if nece5sary~ an antioam and nutrient salt solution are added via line 2. To en~ure thorough mixing, a partition 8 which has orifices 30 and 31 and around which the suspension circulates in a loop motion, is located in the tank l. By means of the measur-ing probes 24, 25, 2S, 27, the pH, the dry matter con-tent, the oxygen partial pressure and the ~emperature of the bac~eria sludge are monitored and kept constant within the abovementioned limits. A part-stream of the effluent is fed via line 10 and pump 13 to the analytical instrument 22 for mea~uring the total pollution parameter Q. The value measured in the analytical in~trument 22 is processed in the measured value-proce~sing and data-output device 23 together with the measured values from the measuring section 18~ 19~ 20.
A second part-stream of the effluent is fed via line 11 and pump 14 to line 17 and, in the latter, mixed with the bacteria sludge before entry to the measurement section.
The oxygen partial pressure is measured by probe 18 at the entry and by probe 19 a$ the e~it of the measuring section. From the oxygen partial pressure~, measured by the probes 1~, 19, the measured value-processing device detennines the oxygen consumption ~pO~ in the measurin~
8ection 18~ 19, 20 and, allowing for the base depletion measllred by the probe 26, the net oxygen consumption ~PO2 net by deduction of the base depletion. This value ~PO2 net is related to the value of the total pollution parameter Q and thus gives a dimensionless oxygen con-sumption number APO2 net Q
which i~ largely indep~ndent of load fluctuations and ~pecific to the effluent.
2g)~5~
The effects due to the apparatus and measuring technique can be compensated on the measured value-processing and data-output device 23 b~ adjusting the multiplier. 5ince the effluent-6pecific 0z con~umption nu~ber varies by an order of magnitude of ~ 20~ depending on the water constituents, the ~ensi~ivity is approp:riately ~elected ~uch that, for the normal ca~e, the effluent-specific oxygen consumptlon number is about 70% of the maxLmum deflec~ion (= 100%) of the indication. The fall of the 2 cons~mption number to 10s~ than half the normal value i6 a sign of a significantly increased inhibition vf degra-dation by the bacteria and can be utilized for trigyering alarms at preselected trip points. ~hus, a first trip point (between 30 and 50~) can first give a provisional alarm, ~o that there is an opportunity for checking the apparatus for constancy of the parameters ~uch as pH, temperature and dry matter content. If the specific oxygen consumption number falls further, a second trip point (<30%) triggers the actual alarm, which initiates the intended preventive measures, for example interrup-tion o the feed to the treatment plant. If the alimenta-tion of the bacteria by the effluent fed through line 11 and pump 14 is insufficient, further effl~ent can be fed ~o the bacteria ~ludse suspension via line 12 and pump 15. The displacement water is taken from the stock and preparation tank 1 via the final clarification part and weir 7.
In view of the generally large numb~r of the effluent discharge ~ources connected to a treatment plantl and the a~sociated diversity of the water con~tituent~, effects cannot be excluded which are caused by inhibitors in the effluenk. The changing composition and concentration of the water constituents in the affluent inflow to a treatment plant can, under some circumstances, al80 lead to an inhibition of the bacterial activity, caused by synergistic effects. In order to protect the biologically operating stage of the treatment plant from ~uch i~ter-ferences due to effluent, countermea~ures must ~e taken in good tLme. However, this reguires appropriate monitor-ing of effluent even up~tream of the trea~ment plant. For this purpose, so-called toximeters are used which func-tion intermittently or continuously with sassile or suspended bacteria.
DE 2,728,071 C2 has disclosed a toximeter method, in which, for detecting water con~tituents injurious to bacteria, a mixture of effluent and oxygen-enriched bacteria sludge i8 continuously pas~ed to an oxygen-mea~uring ~ec~ion and the oxygen depletion i~ deter~i~ed ~y measuring the oxygen partial pre66ure at the ~kart and at t~e end of the measuring ~ection.
~he interpretation of the mea~ured osygen consumption cause~ difficultles. Even i~ parameters such as the p~, temperature, bacteria mas~ and ef~luent rate are kept ~V~
~ 2 --constant, the concentration of the water constituents and henc~ the oxygen depletion vary continually, so that a decrease in oxygen consumption can be due either ~o reduced loading or to an inhibiting efflect. In order to obtain unambiguous information, the inflow of effluent is in~errupted and nutrient solution, the oxygen demand of which is known, is fed instead. If reduced oxygen deple-tion i~ then also foundr ît is certain that the effluent exerts an inhibiting effect. Especially in the case of frequently varying effluent loading, this method is tedious and very laborious. This is ~o be remedied by the i~ventionO
Accordingly, the invention i8 based on the ob~ect of providing a method, by mean~ of which the oxygen dep:le-}5 tion can be assigned unambiguously to an inhibition o the bacterial activityt independently of the effluent loading.
Th~ object is achieved by a method of the type de~cribed at the outset, which comprises passing a part-stream of the effluent to a measurement, by means of which one of the total pollution parameters such as COD, TOC or BOD is determined, mixing a second part-stream of the effluent with an oxygen-rich bacteria sludge ~uspen~ion, feeding a constant rate of the mixture to an oxygen-measuring section, measuring the oxygen depletion ~PO2 and deter-mining the specific oxygen depletion ~PO2 net from ~he oxygen depletion and the value of the total pollution parameter.
The effluent/bacteria sludge suspension rate ratio can be wîthin the lLmits 1:5 to 1:100. l'he second part-stream of the effluent should be mixed with the bacteria sludge as closely a6 po~sible to the entry to the o~ygen-~easuring ~ection. Particularly good result~ are obtained if the bacteria sludge is used at a constant concentration, namely at a dry matter content from 1 to 10 g/l, a t~mperature between 10 and 4S~C, a pH from 5 to 9 and, at r~ 9 the 2ntry to the measuring section, an o.~ygen content of ~3 mg/l. In order to ensure adequate mixing of effluent and bacteria sludge suspension, it is ~ufficient for ~he mixture to flow through the tesk section at 0.1 to 5 m/minute, 60 that the residence tlTne in the test ~ection then amount~ to 0.2 to 10 minutes/m.
The advantages achieved by the invention are to be seen especially in the fact that reduced specific oxygen depletion is substantially independent of the degree of pollution of the efflu~nt and can thus be assigned unambiguously to an inhibition of or damage to the bacteria.
The invention is explained in more detail below by reference to a flow diagram ~Fi~lre), which is intencled to repre8ent an illustrative example.
Effluent is contlnuously taken from the incoming s~wer of the biological treatment plant and passed via li~e 9 to the apparatus for monitoring the effluent for water constituenk~ which interfere with degradation an~ inhibit bacteria. This apparatss contain~, inter alia~ an analy-tical instrument ~2 for continuou61y me~6uring one of ~he total pollution parameters Q, such as chemical oxygen demand (COD), total organic carbon (TOC) or biolvgical oxygen demand (BOD) ! a measuring section compri~ing measuring probes 18, 19 and a re~idence time ~ection 20.
The measuring section 1~, 19, 20 is part of a circulation co~prising a ~tock and preparation tank 1 fsr the bac-teria sludge, a pum~ 16, a pipe 17, the measuring section 18, 19, 20 and a pipe 21. The ~tock and praparation tank 1 is provided with a final clarification part, which i~
separated from the activatin~ part by a partition 6 and has an overflow we~r 7~ The analytical instrument 22 and the mea~uring ~ection 18, 19, 20 are co~nected to a measuring value-proces~ing and data-output device 23 (8hown in dashed line ) which output~ the measured value~
28, 29 which have been determined. In the stock and preparation tank 1, oxygen and/or ai.r is added to the bacteria ~ludge via line 4 and the gas distributor 5, chemicals for adjusting the pH to values from 5 to 9 are added via line 3 andl if nece5sary~ an antioam and nutrient salt solution are added via line 2. To en~ure thorough mixing, a partition 8 which has orifices 30 and 31 and around which the suspension circulates in a loop motion, is located in the tank l. By means of the measur-ing probes 24, 25, 2S, 27, the pH, the dry matter con-tent, the oxygen partial pressure and the ~emperature of the bac~eria sludge are monitored and kept constant within the abovementioned limits. A part-stream of the effluent is fed via line 10 and pump 13 to the analytical instrument 22 for mea~uring the total pollution parameter Q. The value measured in the analytical in~trument 22 is processed in the measured value-proce~sing and data-output device 23 together with the measured values from the measuring section 18~ 19~ 20.
A second part-stream of the effluent is fed via line 11 and pump 14 to line 17 and, in the latter, mixed with the bacteria sludge before entry to the measurement section.
The oxygen partial pressure is measured by probe 18 at the entry and by probe 19 a$ the e~it of the measuring section. From the oxygen partial pressure~, measured by the probes 1~, 19, the measured value-processing device detennines the oxygen consumption ~pO~ in the measurin~
8ection 18~ 19, 20 and, allowing for the base depletion measllred by the probe 26, the net oxygen consumption ~PO2 net by deduction of the base depletion. This value ~PO2 net is related to the value of the total pollution parameter Q and thus gives a dimensionless oxygen con-sumption number APO2 net Q
which i~ largely indep~ndent of load fluctuations and ~pecific to the effluent.
2g)~5~
The effects due to the apparatus and measuring technique can be compensated on the measured value-processing and data-output device 23 b~ adjusting the multiplier. 5ince the effluent-6pecific 0z con~umption nu~ber varies by an order of magnitude of ~ 20~ depending on the water constituents, the ~ensi~ivity is approp:riately ~elected ~uch that, for the normal ca~e, the effluent-specific oxygen consumptlon number is about 70% of the maxLmum deflec~ion (= 100%) of the indication. The fall of the 2 cons~mption number to 10s~ than half the normal value i6 a sign of a significantly increased inhibition vf degra-dation by the bacteria and can be utilized for trigyering alarms at preselected trip points. ~hus, a first trip point (between 30 and 50~) can first give a provisional alarm, ~o that there is an opportunity for checking the apparatus for constancy of the parameters ~uch as pH, temperature and dry matter content. If the specific oxygen consumption number falls further, a second trip point (<30%) triggers the actual alarm, which initiates the intended preventive measures, for example interrup-tion o the feed to the treatment plant. If the alimenta-tion of the bacteria by the effluent fed through line 11 and pump 14 is insufficient, further effl~ent can be fed ~o the bacteria ~ludse suspension via line 12 and pump 15. The displacement water is taken from the stock and preparation tank 1 via the final clarification part and weir 7.
Claims (3)
1. A method for continuous monitoring of effluent for water constituents which interfere with degradation and inhibit bacteria, by measuring the oxygen depletion of a bacteria sludge suspension with added effluent, which comprises passing a part-stream of the effluent to a measurement, by means of which one of the total pollution paramters such as COD, TOC or BOD is determined, mixing a second part-stream with oxygen-rich bacteria sludge suspension, feeding a constant rate of the mixture to an oxygen-measuring section, measuring the oxygen depletion .DELTA.pO2 and determining the specific oxygen depletion .DELTA.pO2 net from the oxygen depletion and the value of the total pollution parameter.
2. The method as claimed in claim 1, wherein the effluent/bacteria sludge mixture is fed at a con-stant effluent/bacteria sludge suspension rate ratio within the limits 1:5 to 1:100 to the oxygen-measur-ing section, the second part-stream of the effluent being mixed with the bacteria sludge on entering the measuring section.
3. The method as claimed in claim 1, wherein the bacteria sludge suspension is used at a constant concentration, the suspension being intended to have a dry matter content from 1 to 10 g/1, a temperature from 10 to 45°C, a pH from 5 to 9 and, at the entry to the measuring section, an oxygen content of 23 mg/1.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3842734.6 | 1988-12-19 | ||
| DE3842734A DE3842734A1 (en) | 1988-12-19 | 1988-12-19 | METHOD FOR CONTINUOUSLY MONITORING WASTEWATER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2005869A1 true CA2005869A1 (en) | 1990-06-19 |
Family
ID=6369545
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002005869A Abandoned CA2005869A1 (en) | 1988-12-19 | 1989-12-18 | Method for continuous monitoring of effluent |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0448613B1 (en) |
| JP (1) | JPH04502275A (en) |
| CA (1) | CA2005869A1 (en) |
| DE (2) | DE3842734A1 (en) |
| WO (1) | WO1990006900A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1277404B1 (en) * | 1995-08-01 | 1997-11-10 | Alberto Rozzi | METHOD FOR CHECKING THE CONCENTRATION IN LIQUIDS OF SUBSTANCES WHICH ARE DEGRADED BY ACIDIFYING ORGANISMS OR |
| DE19629835A1 (en) * | 1996-07-24 | 1998-01-29 | Abb Patent Gmbh | Device for analyzing liquids |
| JP6191404B2 (en) * | 2013-11-07 | 2017-09-06 | 新日鐵住金株式会社 | Sludge activity measuring apparatus and sludge activity measuring method |
| CN108593403A (en) * | 2018-06-07 | 2018-09-28 | 江西怡杉科技有限公司 | A kind of high-chlorine and high-calcium COD in Wastewater system and its application method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2728071C2 (en) * | 1977-06-22 | 1983-06-30 | Bayer Ag, 5090 Leverkusen | Method for the detection of bacteria-damaging water constituents and device for carrying out the same |
| DE2843074A1 (en) * | 1978-10-03 | 1980-04-10 | Boehringer Mannheim Gmbh | METHOD FOR REGULATING AND / OR CONTROLLING A BIOLOGICAL WASTEWATER PLANT |
| DE3038305A1 (en) * | 1980-10-10 | 1982-05-19 | Friedrich Wilhelm Dipl.-Ing. 6100 Darmstadt Siepmann | METHOD AND DEVICE FOR DETECTING BIODEGRADABLE AND TOXIC INGREDIENTS AND AQUEOUS SOLUTIONS, e.g. SEWAGE |
-
1988
- 1988-12-19 DE DE3842734A patent/DE3842734A1/en not_active Withdrawn
-
1989
- 1989-12-14 JP JP2501462A patent/JPH04502275A/en active Pending
- 1989-12-14 DE DE9090900834T patent/DE58902007D1/en not_active Expired - Fee Related
- 1989-12-14 WO PCT/EP1989/001534 patent/WO1990006900A1/en active IP Right Grant
- 1989-12-14 EP EP90900834A patent/EP0448613B1/en not_active Expired - Lifetime
- 1989-12-18 CA CA002005869A patent/CA2005869A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| WO1990006900A1 (en) | 1990-06-28 |
| DE3842734A1 (en) | 1990-06-21 |
| EP0448613A1 (en) | 1991-10-02 |
| DE58902007D1 (en) | 1992-09-10 |
| EP0448613B1 (en) | 1992-08-05 |
| JPH04502275A (en) | 1992-04-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4898829A (en) | Apparatus for the detection of biodegradable and toxic substances in aqueous solutions | |
| US5106511A (en) | On-line biological inhibition/toxicity detector | |
| CA2005869A1 (en) | Method for continuous monitoring of effluent | |
| EP0257057B1 (en) | Method of determining the respiration rate of a respiring material in the form of a continuous process current, as well as a device suitable for such an application | |
| Massone et al. | Biosensors for nitrogen control in wastewaters | |
| US4140487A (en) | Method and apparatus for analysis of water | |
| GB2184110A (en) | Treatment of aqueous material | |
| Temmink et al. | Biological early warning systems for toxicity based on activated sludge respirometry | |
| Painter et al. | The Use of the Wide‐Bore Dropping‐Mercury Electrode for the Determination of Rates of Oxygen Uptake and of Oxidation of Ammonia by Micro‐Organisms | |
| US6146896A (en) | Method and apparatus for measuring the nitrification effectiveness of activated sludge | |
| Chang et al. | Modified Nernst model for on-line control of the chemical oxidation decoloring process | |
| KR100305777B1 (en) | Toxicity measuring device based on activated sludge respiration rate and its operation method | |
| JP3565557B2 (en) | Method and apparatus for monitoring toxic contamination of raw water for tap water | |
| Gameson et al. | Oxidation, reaeration, and mixing in the Thames estuary | |
| CA2085374C (en) | Continuous rbcod measurement | |
| JPH0735741A (en) | Bod measuring equipment | |
| Spanjers et al. | Continuous estimation of short term oxygen demand from respiration measurements | |
| Roesler et al. | Variables to be measured in wastewater treatment plant monitoring and control | |
| Andersen et al. | Testing on-line monitors for ammonia, nitrate, orthophosphate and suspended solids in activated sludge sewage treatment plants | |
| Zagorc-Končan et al. | A simple test for monitoring biodegradable industrial pollution in a receiving stream | |
| Björlenius et al. | Use of on-line data to evaluate the activity in the biological stage at a wastewater treatment plant | |
| Rottiers et al. | Adaptation of the CAS test system and synthetic sewage for biological nutrient removal: part II: design and validation of test units | |
| Arbër et al. | Impact of dairy wastewater in water pollution of a river in Kosovo | |
| Spanjers et al. | Measurement of the toxicity of KCN and some organic compounds for the activated sludge using the Wazu-respiration meter | |
| JP2982999B2 (en) | Method for detecting concentration of slime control agent over time in papermaking water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |