WO2001049615A1 - Wastewater treatment plant operating procedure - Google Patents
Wastewater treatment plant operating procedure Download PDFInfo
- Publication number
- WO2001049615A1 WO2001049615A1 PCT/AU2001/000007 AU0100007W WO0149615A1 WO 2001049615 A1 WO2001049615 A1 WO 2001049615A1 AU 0100007 W AU0100007 W AU 0100007W WO 0149615 A1 WO0149615 A1 WO 0149615A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- basin
- treatment plant
- time period
- waste water
- operating
- Prior art date
Links
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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1263—Sequencing batch reactors [SBR]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/74—Treatment of water, waste water, or sewage by oxidation with air
-
- 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 a wastewater treatment plant operating procedure.
- the known solution to the event of a peak flow above the capacity of the plant is to reduce the time period in which the waste water is treated. This can result in the discharge of poor quality effluent.
- the present invention provides a method of operation which enables a wastewater treatment plant to handle peak flows whilst being constructed at a smaller size than is normal.
- a method of operation of a wastewater treatment plant comprising a plurality of basins arranged in series and arranged to be operated on a sequential fill and draw system wherein when a first basin is full before the end of a fill cycle excess water is diverted into a second basin.
- Figure I is a schematic view of a wastewater treatment plant
- FIGS. 2 to 5 illustrate schematically operation of the plant of Figure 1 through a complete cycle of stages
- Figures 6 and 7 illustrate schematically a modified method of operation of the plant of Figure 1 for increased efficiency during peak flow periods.
- an intermittent wastewater treatment plant 10 comprising an outflow channel or pipe 12, a plurality of basins 14, 16, 18 arid 20, a main inflow conduit 21 and a splitter box 22 from which extend a plurality of inflow conduits 24 extending to respective basins 14, 16, 18 and 20.
- the basins 14, 16, 18 and 20 are all of equal capacity.
- Each basin 14, 16, 18, and 20 includes a plurality of decanters 26.
- the plant 10 operates on a sequential fill and draw system.
- wastewater is treated in the basins 14, 16, 18 and 20.
- Each basin is in turn filled with wastewater through the main inflow conduit 21, the splitter box 22 and an inflow conduit 24.
- each basin is aerated usually during all or part of the filling process. Suspended solids in the aerated wastewater are then allowed to settle and after a period clean water is decanted from the basin.
- the process is repeated continually as wastewater flows into the plant 10.
- the plant of the present invention must have at least three basins but preferably has four or more basins. With a four basin plant one mode of operation is to fill and aerate each basin for a first time period, to allow settling for a second time period and to decant for a third time period.
- the length of each time period is determined primarily by process requirements.
- the length of the first time period is typically equal to the combined length of the second and third time periods.
- the capacity of the basins is typically determined by the amount of wastewater expected to enter the plant 10 at daily peak flow periods. Thus, all of the basins have a capacity reflecting peak flow rates although in a normal mode of operation only one or two may actually be filled to capacity even at peak flow rates.
- the basin 14 continues to be aerated until the end of its normal fill and aerate cycle is reached. Further, it is possible that the basin 16 will also fill before its fill and aerate cycle is completed. In this case, any excess wastewater is allowed to spill into the basin 18 which itself is a partway through its own fill and aerate cycle. The process of spilling over to the next basin continues for as long as required until the inflow through the conduit 21 drops.
- Figure 2 shows the state of the wastewater treatment plant 10 not experiencing peak flow at a time part way through a time period during which the first basin 14 is towards the end of the time period of filling and aerating, the second basin 16 is towards the start of the period of filling and aerating, the third basin 18 is decanting and the fourth basin 20 is settling.
- the plant 10 is shown partway through the next time period in Figure 3 in which the first basin 14 is settling, the second basin 16 is filling and aerating, the third basin 18 is filling and aerating and the fourth basin 20 is decanting.
- FIG 4 the plant 10 is shown partway through the next time period in which the first basin 14 is decanting, the second basin 16 is settling, the third basin 18 is filling and aerating and the fourth basin 20 is filling and aerating.
- the state of the plant 10 during the final time period of this example is shown in Figure 5.
- the first basin 14 is filling and aerating
- the second basin 16 is decanting
- the third basin 18 is settling
- the fourth basin 20 continues to fill and aerate.
- the cycle continues in this pattern, with the next time period returning the plant to the state shown in Figure 2.
- the present invention is primarily concerned with the operation of the plant 10 during peak flow periods. In such a case the basin being filled is filled before the end of the period during which it is required to fill and aerate. Such a situation is shown in
- the first basin 14 is filled with wastewater before the end of the current fill and aeration time period.
- incoming wastewater is diverted to the basin which is near the start of a filling and aerating period (in the example of Figure 6 this is the second basin 16). However, aerating continues in both the full and the filling basins.
- the method of operation described above has the effect of distributing peak flows of wastewater more evenly about the available basins. This reduces the required capacity
- the method of operation described above has the effect of distributing peak flows of wastewater more evenly about the available basins. This reduces the required capacity of each individual basin. The process also ensures that full treatment of wastewater is performed during peak flow periods.
- the same method is applicable to management of wet weather events whereby the normal inflow is augmented by rain water. If such an event causes the inflow to the plant 10 to be excessive, then it may be necessary to reduce the length of each time period as well as operating the plant in accordance with the present invention.
- the inflow in such a case is generally extremely diluted, and reduced aeration times are sufficient for adequate water treatment. Further, the amount of reduction of the time period may be calculated from measurement of flow rates upstream of the plant 10.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Activated Sludge Processes (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU24941/01A AU771721B2 (en) | 2000-01-07 | 2001-01-05 | Wastewater treatment plant operating procedure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPQ4966 | 2000-01-07 | ||
AUPQ4966A AUPQ496600A0 (en) | 2000-01-07 | 2000-01-07 | A wastewaster treatment plant operating procedure |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001049615A1 true WO2001049615A1 (en) | 2001-07-12 |
Family
ID=3819100
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2001/000007 WO2001049615A1 (en) | 2000-01-07 | 2001-01-05 | Wastewater treatment plant operating procedure |
Country Status (2)
Country | Link |
---|---|
AU (1) | AUPQ496600A0 (en) |
WO (1) | WO2001049615A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5516423A (en) * | 1994-08-08 | 1996-05-14 | Concorp, Inc. | Variable residence time treatment system |
US5902484A (en) * | 1993-09-30 | 1999-05-11 | Timpany; Peter L. | Method and system for treatment of water and wastewater |
US6004456A (en) * | 1997-12-09 | 1999-12-21 | Khudenko; Boris Mikhallovich | Equalization basin-reactor system |
-
2000
- 2000-01-07 AU AUPQ4966A patent/AUPQ496600A0/en not_active Abandoned
-
2001
- 2001-01-05 WO PCT/AU2001/000007 patent/WO2001049615A1/en active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5902484A (en) * | 1993-09-30 | 1999-05-11 | Timpany; Peter L. | Method and system for treatment of water and wastewater |
US5516423A (en) * | 1994-08-08 | 1996-05-14 | Concorp, Inc. | Variable residence time treatment system |
US6004456A (en) * | 1997-12-09 | 1999-12-21 | Khudenko; Boris Mikhallovich | Equalization basin-reactor system |
Also Published As
Publication number | Publication date |
---|---|
AUPQ496600A0 (en) | 2000-02-03 |
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