EP2162804A1 - Process control software for the control of hydraulic retention time in a biological reactor - Google Patents
Process control software for the control of hydraulic retention time in a biological reactorInfo
- Publication number
- EP2162804A1 EP2162804A1 EP20070733270 EP07733270A EP2162804A1 EP 2162804 A1 EP2162804 A1 EP 2162804A1 EP 20070733270 EP20070733270 EP 20070733270 EP 07733270 A EP07733270 A EP 07733270A EP 2162804 A1 EP2162804 A1 EP 2162804A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- reactor
- control
- retention time
- hydraulic retention
- biological
- 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.)
- Withdrawn
Links
- 230000014759 maintenance of location Effects 0.000 title claims abstract description 33
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 7
- 230000009467 reduction Effects 0.000 claims description 5
- 150000002823 nitrates Chemical class 0.000 claims description 4
- 238000010586 diagram Methods 0.000 claims 1
- 229910001873 dinitrogen Inorganic materials 0.000 claims 1
- 239000010841 municipal wastewater Substances 0.000 abstract description 4
- 239000010842 industrial wastewater Substances 0.000 abstract description 3
- 239000002351 wastewater Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 235000015097 nutrients Nutrition 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 235000021317 phosphate Nutrition 0.000 description 2
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 2
- 230000001932 seasonal effect Effects 0.000 description 2
- 101100468275 Caenorhabditis elegans rep-1 gene Proteins 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical class S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009118 appropriate response Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 150000003568 thioethers Chemical class 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
-
- 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
-
- 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
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
- C02F2101/163—Nitrates
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Definitions
- the present invention relates to control software required for the operation of a balance tank reactor as described by Olaopa Process in European Patent No. 1196354 and US Patent No.: 6562237.
- Olaopa Process describes a biological reactor for the reduction/elimination of nitrogen and/or phosphates incorporating balancing of reactor' s constituents in such a way as to maintain a constant hydraulic retention time (HRT) within the tank under variable flow regime.
- HRT hydraulic retention time
- the outlet from the reactor is located below top water level and the outflow can be controlled with a pump or control valve.
- anoxic/anaerobic reactors are defined on the basis of the influent displacing similar volumes on the outlet.
- Olaopa Process (Pat.No.rEP 1 196354 & US 6562237) referred to in this invention is the only anoxic/anaerobic reactor allowing for variable flow rates on the inlet and controlled flow on the outlet of the reactor.
- control panel incorporating computerised software allowing variation of hydraulic retention time within a biological reactor primarily used for the dissimilatory reduction of nitrates to nitrogen.
- the control panel may also have incorporated into it computerised software allowing variation of mixing ratio of the influents into the biological reactor typically crude wastewater and nitrified re-circulating mixed liquor.
- an operator will define a hydraulic retention time and mix-ratio on the control panel.
- the computer programme Upon pressing 'START' on the panel the computer programme will control the volume of nitrified effluent to be mixed with the crude wastewater to the treatment plant and the hydraulic retention time within the biological reactor.
- a hydraulic level sensor will read the top water level in the reactor, calculate the volume of the liquid in the reactor and use the reactor volume and selected hydraulic retention time to set a pumping flow rate out of the reactor. If the level in the tank rises there will then be a corresponding increase in pumping rate and vice versa. This will be sufficient if the software is for the control of hydraulic retention time only.
- the mixing ratio of the re-circulating influent and crude wastewater influent is selected and the desirable hydraulic retention time (HRT) is also selected.
- the incoming flowrate and desirable HRT is used to calculate appropriate hydraulic level in the reactor. Where the desirable hydraulic level does not match existing hydraulic level in the reactor, the discharge pumping rate can be increased or decreased.
- This programme can be used for the control of a flow mix into the reactor (re-circulating nitrified influent and crude wastewater) and maintaining a specified hydraulic retention time under variable flow regimes.
- the volume of liquid in the reactor and the selected hydraulic retention time will be used to calculate the percentage opening of a control valve located on the discharge pipework from the reactor.
- the control panel can contain either or both of the controls described i.e. hydraulic retention time only or hydraulic retention time and mix-ratio.
- control panel according to the present invention remain applicable to the simultaneous control of mix ratios into the anoxic/anaerobic compartment(s) and any control of hydraulic retention time within the tanks.
- control panel can be applied to the aerobic compartment of any biological reactor.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Environmental & Geological Engineering (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Biodiversity & Conservation Biology (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
A computer programme software for the control of hydraulic retention time only or hydraulic retention time and mixing ratio of influents within biological reactors including aerobic, anoxic/anaerobic reactors used in municipal and industrial wastewater treatment.
Description
PROCESS CONTROL SOFTWARE FOR THE CONTROL OF HYDRAULIC RETENTION TIME IN A BIOLOGICAL REACTOR hgS>G£IPTfC7M
The present invention relates to control software required for the operation of a balance tank reactor as described by Olaopa Process in European Patent No. 1196354 and US Patent No.: 6562237.
Conventionally, biological nutrient removal reactors used for the reduction/elimination of nitrates and/or phosphates operate on 'Archimedes principle' i.e. any flow into the inlet of the reactor displaces similar flow on the outlet. The implication of this arrangement is that hydraulic retention time within the tank can only be defined for a particular flow. At all other flows beside the defined flow the hydraulic retention time is variable.
Olaopa Process describes a biological reactor for the reduction/elimination of nitrogen and/or phosphates incorporating balancing of reactor' s constituents in such a way as to maintain a constant hydraulic retention time (HRT) within the tank under variable flow regime. To achieve this, the outlet from the reactor is located below top water level and the outflow can be controlled with a pump or control valve.
In operation, increases in the hydraulic level within the tank can be picked up by a level sensor and the information translated to mean increasing or decreasing flow at the inlet. The software according to the present invention will then trigger appropriate response in the outlet pump to compensate or trigger an increase/decrease in valve opening to compensate to maintain a pre-determined hydraulic retention time. The desirable control condition would be reached when the incoming flow Q is equal to control volume (V) divided by the HRT. It will also be possible according to the present invention for the software to impose variable hydraulic retention times within the reactor to impose variable hydraulic retention times on different flows; for example for a specified flow regime it might be the case that a hydraulic retention time is imposed on the reactor; beyond these values the retention time can be varied to suit process requirements. In municipal wastewater treatment it is usually the case that flows within certain range in a combined sewer are interpreted as coming from normal diurnal variation. Seasonal fluctuation causing seasonal increase in flows will require different control on the outflow pump or valve. This is because increases from stormflows are accompanied by lower organic concentrations and might require lower retention times within the reactor.
In all known cases of biological nutrient removal, anoxic/anaerobic reactors are defined on the basis of the influent displacing similar volumes on the outlet. Olaopa Process (Pat.No.rEP 1 196354 & US 6562237) referred to in this invention is the only anoxic/anaerobic reactor allowing for variable flow rates on the inlet and controlled flow on the outlet of the reactor.
It is an object of the present invention to provide a computerised programme software to control the outflow from an anoxic and/anaerobic biological reactor using a pump or actuated valve capable of variable opening.
It is also an object of the present invention to provide a control panel that will incorporate a mix-ratio for the reactors influents into the same control panel housing the hydraulic retention time control.
The importance of this aspect is in that in the removal of nitrogen from municipal and industrial wastewater treatment, removal rates are dependent on re-circulation
rates of nitrified mixed liquor coming from an aerobic biological environment into the nutrient removal reactor as defined in Pat. EPl 196354 & US 6562237. Integration of a mix-ratio control software in the same panel as the software for the control of hydraulic retention time allows plant operators the flexibility to control plant performance (see fig. l).
In addition to nutrient removal, variability of dissolved oxygen concentrations in the re-circulating nitrified influent into the reactor can allow for biological oxidation of sulfides, mercaptans and other malodorous compounds contained within the same wastewater. Doing this eliminates the need for chemical treatment of wastewaters for odour removal and dissimilatory reduction of nitrates.
According to the present invention there is provided a control panel incorporating computerised software allowing variation of hydraulic retention time within a biological reactor primarily used for the dissimilatory reduction of nitrates to nitrogen. The control panel may also have incorporated into it computerised software allowing variation of mixing ratio of the influents into the biological reactor typically crude wastewater and nitrified re-circulating mixed liquor.
Preferably based on process requirements, an operator will define a hydraulic retention time and mix-ratio on the control panel. Upon pressing 'START' on the panel the computer programme will control the volume of nitrified effluent to be mixed with the crude wastewater to the treatment plant and the hydraulic retention time within the biological reactor.
As an example of how the software can work, a hydraulic level sensor will read the top water level in the reactor, calculate the volume of the liquid in the reactor and use the reactor volume and selected hydraulic retention time to set a pumping flow rate out of the reactor. If the level in the tank rises there will then be a corresponding increase in pumping rate and vice versa. This will be sufficient if the software is for the control of hydraulic retention time only. In the case of the control panel shown in fig. l the mixing ratio of the re-circulating influent and crude wastewater influent is selected and the desirable hydraulic retention time (HRT) is also selected. The incoming flowrate and desirable HRT is used to calculate appropriate hydraulic level in the reactor. Where the desirable hydraulic level does not match existing hydraulic level in the reactor, the discharge pumping rate can be increased or decreased. This programme can be used for the control of a flow mix into the reactor (re-circulating nitrified influent and crude wastewater) and maintaining a specified hydraulic retention time under variable flow regimes.
In the case of a valve control where an actuated valve is used to control the outflow from the biological reactor, the volume of liquid in the reactor and the selected hydraulic retention time will be used to calculate the percentage opening of a control valve located on the discharge pipework from the reactor. The percentage opening is derived from Orifice principle' that says that for hydraulic reactors discharging under gravity, the hydraulic level is related to the discharge flow rate by this relationship: Q = Cd(2gA)1/2 where A is the cross-sectional area of the discharge pipe and Cd is a coefficient of discharge. Desirable discharge flow rate can then be calculated for all flow ranges and the valve opening adjusted to suit.
It will be understood that the control panel can contain either or both of the controls described i.e. hydraulic retention time only or hydraulic retention time and mix-ratio.
The examples above show variations of the software that can be imposed on the reactor. It will be understood however that the present invention will cover any and all software programmes that seek to impose a balancing regime or control the top water level in aerobic, anoxic/anaerobic biological reactors.
It will also be understood that various alterations and modifications may be made to the above control panel without departing from the scope of the invention either by inclusion of other controllers, indicators as typified by inclusion in a Mains Control Centre (MCC), Programmable Logic Control (PLC) panel, SCADA etc. and that the invention is applicable to both municipal and industrial wastewater treatment plant.
It will also be understood that where the anoxic and/or anaerobic reactor are compartmentalized in the same reactor as the aerobic reactor, the control panel according to the present invention remain applicable to the simultaneous control of mix ratios into the anoxic/anaerobic compartment(s) and any control of hydraulic retention time within the tanks.
It will also be understood that the control panel can be applied to the aerobic compartment of any biological reactor.
Claims
1. A computer programme software for the control of hydraulic retention time within a biological anoxic and/or anaerobic tank wherein the programme controls the operation of pumps withdrawing effluent from the reactor and/or actuated valves controlling discharge from the reactor.
2. A computer programme software foτ the control of hydraulic retention time within an aerobic biological reactor wherein the programme controls the operation of pumps and/or actuated valves controlling discharge from the reactor.
3. A computer software programme for the control of hydraulic retention time within a biological anoxic -and/or anaerobic reactor as defined in existing patents EP 1196354 and US 6562237.
4. A computer -software programme according to any preceding claim suitable for application in municipal and industrial biological wastewater treatment.
5. A computer software programme according to claim 4 wherein the software can be used primarily for odour control.
6. A computer software programme according to any preceding claim for the control of hydraulic retention time within a biological reactor and the mixing ratio of influents into the reactor.
7. A computer software programme according to claim 6 wherein the hydraulic retention time and mixing ratio are used to control odour removal and dissimilatory reduction of nitrates to nitrogen gas simultaneously in a biological reactor.
8. A computer software programme according to any preceding claim wherein both the hydraulic retention time and mixing ratio can be manipulated on the same control panel typically as shown in figure 1 of the accompanying drawings.
9. A computer software programme for the control of mixing ratio of influents into a biological reactor and/or hydraulic retention time within the biological reactor exemplified with reference to figures 2 to 5 of the accompanying diagrams.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/GB2007/002267 WO2008155510A1 (en) | 2007-06-18 | 2007-06-18 | Process control software for the control of hydraulic retention time in a biological reactor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2162804A1 true EP2162804A1 (en) | 2010-03-17 |
Family
ID=39011565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20070733270 Withdrawn EP2162804A1 (en) | 2007-06-18 | 2007-06-18 | Process control software for the control of hydraulic retention time in a biological reactor |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2162804A1 (en) |
| GB (1) | GB2461466A (en) |
| WO (1) | WO2008155510A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9475715B2 (en) | 2012-11-16 | 2016-10-25 | Xylem Water Solutions U.S.A., Inc. | Optimized process and aeration performance with an advanced control algorithm |
| CN110204033B (en) * | 2019-05-08 | 2021-07-23 | 南开大学 | Method for recovering nitrate nitrogen in wastewater through microbial electrochemical ammonification |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1223293B (en) | 1987-08-07 | 1990-09-19 | Snam Progetti | BILOGICAL WASTEWATER TREATMENT PROCEDURE |
| GB9826575D0 (en) | 1998-12-04 | 1999-01-27 | Oladpa Tox | |
| DE69932953T2 (en) | 1999-06-02 | 2007-12-20 | Tox Woking Olaopa | BIOLOGICAL NUTRIENT REMOVAL WITH THE HELP OF THE "OLAOPA PROCEDURE" |
| WO2003066535A1 (en) * | 2002-02-07 | 2003-08-14 | Lorne Karl | Method and system for controlling a biological reactor unit |
| KR100456413B1 (en) * | 2002-06-21 | 2004-11-10 | 에치투엘 주식회사 | System and method for AI controlling waste-water treatment by neural network and back-propagation algorithm |
| US7005073B2 (en) * | 2003-05-01 | 2006-02-28 | The University Of Florida Research Foundation, Inc. | Residual wastewater chlorine concentration control using a dynamic weir |
-
2007
- 2007-06-18 GB GB0919349A patent/GB2461466A/en not_active Withdrawn
- 2007-06-18 WO PCT/GB2007/002267 patent/WO2008155510A1/en active Application Filing
- 2007-06-18 EP EP20070733270 patent/EP2162804A1/en not_active Withdrawn
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008155510A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0919349D0 (en) | 2009-12-23 |
| WO2008155510A1 (en) | 2008-12-24 |
| GB2461466A (en) | 2010-01-06 |
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