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WO2003045527A1 - Procede de lavage de filtres granulaires et bioreacteurs - Google Patents

Procede de lavage de filtres granulaires et bioreacteurs Download PDF

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Publication number
WO2003045527A1
WO2003045527A1 PCT/US2001/024484 US0124484W WO03045527A1 WO 2003045527 A1 WO2003045527 A1 WO 2003045527A1 US 0124484 W US0124484 W US 0124484W WO 03045527 A1 WO03045527 A1 WO 03045527A1
Authority
WO
WIPO (PCT)
Prior art keywords
backwash
filter
valve
seconds
water
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.)
Ceased
Application number
PCT/US2001/024484
Other languages
English (en)
Inventor
Greg A. Ellard
Gary D. Mann
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.)
Tetra Process Technologies
Original Assignee
Tetra Process Technologies
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.)
Filing date
Publication date
Priority to US09/917,480 priority Critical patent/US6461525B2/en
Priority claimed from US09/917,480 external-priority patent/US6461525B2/en
Application filed by Tetra Process Technologies filed Critical Tetra Process Technologies
Priority to GB0302803A priority patent/GB2385286B/en
Priority to AU2001279187A priority patent/AU2001279187A1/en
Priority to PCT/US2001/024484 priority patent/WO2003045527A1/fr
Publication of WO2003045527A1 publication Critical patent/WO2003045527A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/002—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with multiple filtering elements in parallel connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
    • B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
    • B01D24/105—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container downward filtration without specifications about the filter material supporting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46—Regenerating the filtering material in the filter
    • B01D24/4631—Counter-current flushing, e.g. by air

Definitions

  • the present invention relates to a method of removing solid material buildup from granular media filters and bioreactors. Particularly, the invention is directed to a method of removing solid material buildup from granular media filters and bioreactors utilizing an air and water backwash system.
  • the removal of solids from the filter system is discretely accomplished during a backwash process, meaning that a single filter is isolated from the treatment system and the backwash process for the removal of suspended solids is initiated and completed before the next filter is initiated into the process. Further, while a specific filter is removed from the system, remaining filters in the system must handle the additional workload of the isolated element.
  • CSO's discharge contain a variety of pollutants that may adversely affect the receiving water body, including pathogenic microorganisms, viruses, cysts, chemicals and floatable materials. Because of the rapid buildup of solids in the filter during storm surges, traditional methods of backwashing cannot keep up with the surge of wastewater flow and the CSO must be discharged into nearby rivers and streams. Reducing CSO discharge by improved backwashing so that filters can handle greater loads is an object of this invention.
  • the present invention relates to an improved method for backwashing granular media treatment systems comprising multiple filters in a continuous cycle.
  • the method of backwashing removes suspended solids from filter media and the filter infrastructure with a reduction of the backwash time required for each filter and a minimum of backwash water used in restoring flow capacity. This allows the filter system to operate at a time of very high solids/hydraulic loading in situations such as storm surges. Reducing the backwash time reduces the time each filter is out of operation so that treatment filters operate more efficiently and are better able to handle the combined sewer overflows produced by the storm surges.
  • METHOD FOR BACKWASHING GRANULAR MEDIA FILTERS AND BIOREACTORS innovative aspect of this backwash method is to reduce the typical air/water backwash time for each filter from about 35 minutes to about 5 minutes or less.
  • the method is characterized by a continuous cycle of backwashing that backwashes two filters simultaneously. Efficient backwashing requires two steps, a first air/water bashwash and a second water-only or rinse backwash.
  • the backwash cycle of a second filter is started so that the second filter is air/water backwashed during the water-only backwashed stage of the previous filter.
  • each filter in a series of filters is out of the filtration process for only about 5 minutes, thereby minimizing downtime and disruption of the filtration process necessary to restore the capacity of the filters caused by buildup of solids.
  • a seamless transition from one filter to another occurs during the backwash stages. This enables the filters to operate at a high level of solid/hydraulic loading. Also the continuous cycling of the backwash process through the filters in a system minimizes the start/stop action on the backwash water pumps and air blowers saving wear and tear on this equipment.
  • One preferred method for removal of solids in a water treatment system having mutiple filters, each filter comprising an air backwash system and a water backwash system comprises a series of steps to enable two filters to be in some stage of the backwash process at the same time thereby reducing the time the filter is out of service. Not all of the steps are sequential.
  • the steps can comprise:
  • the series of steps to backwash a multi-filter treatment system in a continuous cycle can comprise: a) Closing the influent and effluent valves, and opening the backwash air valve of the initial filter to be backwashed; b) Opening the backwash water and dirty backwash water valves of the initial filter; c) Turning on the backwash blowers, beginning air backwash of initial filter; d) Turning on backwash water pumps and backwashing initial filter with a combined air/water backwash; e) closing the influent and effluent valves of the next filter to be backwashed and opening backwash air valve of next filter; f) closing the backwash air valve of the initial filter thereby stopping air backwash of the initial filter and starting air backwashing of next filter;
  • the backwash time for each filter can be reduced from approximately 35 minutes per filter to a range of 2 to
  • the backwash time per filter during a continuous cycle of backwashing a multi-filter system is approximately 5 minutes per filter.
  • Fig. 1 is a flowchart illustrating one sequence of steps for the backwash method.
  • Fig. 2 is a schematic of a filter illustrating the upward flow of backwashing.
  • the present invention is a method of backwashing a multi-filter wastewater treatment system in continuous cycle to remove waste solids from biological filters and filter media. With the method of this invention, the time needed to clean each
  • METHOD FOR BACKWASHING GRANULAR MEDIA FILTERS AND BIOREACTORS filter is considerably lessened thereby minimizing flow interruption throughout the filter system and improving the system's filtration rate during moderate to heavy solids/hydraulic loading.
  • wastewater load on treatment filters caused by combined storm water runoff and sanitary sewage in the same pipe can increase the typical work load on a treatment system, for example, from the normal load of 60 million gals/day to 360 million gal./day.
  • the surges can containing suspended solids up to 500 mg/l up from the normal 10mg/l. Solids and heavy hydraulic loading can build up to the point of shutting down the filter because the filter cannot expel the solids fast enough by prior backwashing methods.
  • the fast backwashing method of this invention removes the overload of solids.
  • One accomplishment of this method reduces the typical air/water backwash time for each filter from about 35 minutes to about 10 minutes or less. To achieve this reduction of backwash time, the method backwashes two filters simultaneously. Efficient backwashing requires three steps, a short air wash, a combined air backwash and water bashwash and a third water-only backwash.
  • the backwash cycle of a second filter is started so that the second filter is air/water backwashed while the first filter is at the water-only backwashed stage.
  • each filter in a series of filters is out of the filtration process for only about 10 minutes, thereby minimizing downtime needed to backwash because of the buildup of solids and disruption of the filtration process that is necessary to restore the capacity of the filters.
  • Continuous cycle backwashing enables the treatment filter system to operate at very high solids/hydraulic loading and minimizes the stop and start of water pumps and air blowers.
  • FIG. 1 The flowchart of Figure 1 illustrates one preferred method for removal of solids in a water treatment system having multiple filters.
  • Typcial filter treatment systems can have anywhere between 2 to 30 filters, each filter 200 comprising an air backwash system and a water backwash system as seen in Fig. 2.
  • METHOD FOR BACKWASHING GRANULAR MEDIA FILTERS AND BIOREACTORS 100 of this method comprises closing the influent valve and effluent valve of the initial, or first filter 200 in a filter treatment system, to get the filter off line. This shuts off the influent wastewater supply and stops effluent flow.
  • the backwash air valve of initial filter is opened at this time.
  • Several types of automatic valve openers can be used to open filter valves.
  • One preferred valve opener is a fluid actuated valve opener, either air or other gas in a pneumatic valve opener or hydraulic fluids for a hydraulic valve opener.
  • an electrically actuated valve opener can be used, although pneumatic or hydraulic valve openers are preferred because they are faster thereby saving time during the backwash process.
  • the valve openers and electrical equipment that turn the backwashwater pumps and backwash air blowers on and off are controlled by a controller programmed by an operator so that the entire backwash system is automated.
  • the backwash air blowers are turned on for air backwash.
  • one set of air blowers can be used to air backwash all the filters in a treatment system. Since the backwash air valve is already opened, turning on the air blowers starts the air backwashing of the initial filter started. Air backwashing breaks up and foams the captured suspended solids so that they become suspended in the backwash water and float to the top and out over the weir of the filter 250.
  • the next step 115 comprises opening the backwash water valve and the dirty backwash water valve of the initial filter. The backwash pumps for water backwash are turned on 120 and the air/water backwash begins. The initial filter is than backwashed with an air/water backwash 125.
  • the air/water backwash scrubs the filter media and the filter underdrain system and carries the waste solids out of the filter.
  • the influent and effluent valves of next filter are then closed 130, taking the next filter out of filter treatment system and the backwash air valve of the next filter is opened 130.
  • the air backwash valve on initial filter is then closed starting the air backwash on next filter since that valve was opened 135 during the previous step.
  • the backwash water valve and dirty backwash water valve on next filter are opened
  • one backwash water pump services all the filters within a treatment system. When one water pump is used, two filters are backwashed with one pump with the aid of flow control devices. Alternatively, a system can use two or more backwash water pumps so that each filter can have its own water pump during the phase when two filters are being backwashed simultaneously. After the initial filter is backwashed, the backwash water valve and dirty backwash water valve of initial filter are closed 145. The filter is ready to go back into service and the influent valve and effluent valve of initial filter are opened 150.
  • the automated method goes through a sequence of queries which determines if subsequent filters are to be backwashed.
  • the first query is: has the operated halted the backwash process 180? If yes, the air blowers are stopped 160 and air backwash valves closed 160. Then after completion of the water only rinse, the backwash water pump is then turned off and botn the backwash water valve and dirty backwash water valve of the last filter to be backwashed are closed 165. Finally the influent and effluent valves on the final filter are opened 170 and the filter is put back in operation.
  • the second query is: has the operator designated a preset limit of elapsed time or number of filters to be backwashed 185? If yes, the cycle ends and the backwash process goes through its final steps of finishing the final filter and putting it back into operation. If no preset limit has been reached the backwash cycle continues with backwashing the next filter in the series.
  • the final query is: are there any further filters scheduled to be cleaned 190? The backwashing process ends when the last scheduled filter in the system is backwashed. Until one of these queries is answered positively, the steps of closing off the influent and effluent valves and opening and closing the backwash air valves and backwash water and
  • the timing of the sequence of steps of the continuous cycle of backwashing is critical to completing backwashing of a filter treatment system as quickly as possible under the storm surge or other conditions requiring fast backwashing to maintain good filtration rates during moderate to heavy solids/hydraulic loading.
  • the complete backwashing of each filter with both an air backwash and water backwash is completed within a time range of 2 minutes to 20 minutes per filter, preferably, 2 minutes to 15 minutes.
  • the backwash sequence is completed in 4 minutes to 6 minutes, and preferably in 5 minutes.
  • One preferred method for removal of solids in a water treatment system having mutiple filters utilizing an electrically actuated valve opener comprises the following sequence:
  • An alternative method for removal of solids in a water treatment system having multiple filters using a pneumatic or hydraulic actuated valve opener is faster than electrically actuated valve opener.
  • the alternative method comprises a timing sequence as follows: closing influent valve and effluent valve of initial filter and opening backwash air valve of initial filter 2 seconds to 30 seconds;
  • the opening of the influent and effluent valves for each filter is performed within a time range of 4-6 seconds and the closing of the influent and effluent valves for each filter is performed within a time range of 4-6 seconds.
  • the opening of the backwash air valve for each filter is performed within a time range of 4-6 seconds and the closing of the backwash air valve for each filter is performed within a time range of 4-6 seconds.
  • the opening of the backwash water valve and dirty backwash water valve for each filter is performed within a time range of 4-6 seconds and the closing of the backwash water valve and dirty backwash water valve for each filter is performed within a time range of 4-6 seconds. As valves age, they may move more slowly.
  • the turning on the backwash air blower and starting the air backwash of each filter is performed within a time range of 4-6 seconds and the closing of the backwash air valve of the initial filter and starting the air backwash of the next filter is performed within a time range of 4-6 seconds.
  • Turning on the backwash pumps for water backwash and backwashing each filter with an air/water backwash is performed within a preferred time range of 200-300 seconds and the backwashing of each filter with a water-only backwash of the previous filter is simultaneous to the air/water backwash of the next filter and is performed within a preferred time range of 200-300 seconds.
  • Closing of the backwash water valve and dirty backwash water valve for the final filter and turning off the backwash pumps for water backwash is performed within a time range of 4-6 seconds.
  • opening and closing any pneumatically controlled valve takes about 5 seconds.
  • the process of air/water backwashing takes approximately a total of ten minutes, five minutes of air/water

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

L'invention concerne un procédé permettant d'éliminer des solides dans un système de traitement des eaux pourvu de plusieurs filtres, chaque filtre comprenant un système de lavage à soufflerie et un système de lavage par retour d'eau. Ce procédé comprend une série d'étages permettant à deux filtres de se trouver au même moment à un certain étage du processus de lavage, ce qui permet de réduire le temps durant lequel le filtre ne fonctionne pas. Le recyclage continu de ce procédé de lavage est caractérisé en ce qu'un cycle continu de lavage permet de laver à contre-courant deux filtres simultanément. Ce procédé de lavage requiert trois étapes : une étape de lavage à soufflerie, une autre de lavage à soufflerie/à l'eau, et une autre de lavage de rinçage ou de lavage à l'eau uniquement. Selon ce procédé, alors qu'un filtre ne se trouve qu'à l'étape de lavage à l'eau, le cycle de lavage d'un second filtre est lancé, de telle manière que le second filtre est lavé à l'eau/à l'air, tandis que le premier filtre ne se situe qu'à l'étape de lavage à l'eau. En fonction du poussoir utilisé pour ouvrir et fermer les purgeurs d'air et les robinets de débit d'eau de lavage, chaque filtre dans une série de filtres se situe hors du processus de filtration pendant environ 2 à 15 minutes seulement, ce qui permet de minimiser un temps d'immobilisation et une interruption du processus de filtration nécessaire pour restaurer la capacité des filtres, ledit temps d'immobilisation et ladite interruption étant occasionnés par l'accumulation de solides. Ainsi, les filtres peuvent fonctionner à un niveau élevé de charge solide/hydraulique, telle que celle occasionnée par des surpressions d'eaux d'orage.
PCT/US2001/024484 2000-08-01 2001-08-02 Procede de lavage de filtres granulaires et bioreacteurs Ceased WO2003045527A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US09/917,480 US6461525B2 (en) 2000-08-01 2001-07-28 Method for backwashing granular media filters and bioreactors
GB0302803A GB2385286B (en) 2000-08-01 2001-08-02 Method for backwashing granular media filters and bioreactors
AU2001279187A AU2001279187A1 (en) 2001-08-02 2001-08-02 Method for backwashing granular media filters and bioreactors
PCT/US2001/024484 WO2003045527A1 (fr) 2000-08-01 2001-08-02 Procede de lavage de filtres granulaires et bioreacteurs

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US22243500P 2000-08-01 2000-08-01
US09/917,480 US6461525B2 (en) 2000-08-01 2001-07-28 Method for backwashing granular media filters and bioreactors
PCT/US2001/024484 WO2003045527A1 (fr) 2000-08-01 2001-08-02 Procede de lavage de filtres granulaires et bioreacteurs

Publications (1)

Publication Number Publication Date
WO2003045527A1 true WO2003045527A1 (fr) 2003-06-05

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PCT/US2001/024484 Ceased WO2003045527A1 (fr) 2000-08-01 2001-08-02 Procede de lavage de filtres granulaires et bioreacteurs

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110734125A (zh) * 2019-11-12 2020-01-31 东莞市玮霖环保科技有限公司 可调水位的高效型滤池反冲洗方法及结构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082664A (en) * 1976-07-22 1978-04-04 Ecodyne Corporation Filter and method
US4141824A (en) * 1977-10-25 1979-02-27 Midcon Pipeline Equipment Co. Tangentially fed upflow sand filter method and apparatus
US4591436A (en) * 1981-12-23 1986-05-27 Cojafex B.V. Apparatus for separation of suspensions from a fluid under pressure
US5089117A (en) * 1990-08-01 1992-02-18 Infilco Degremont Inc. Apparatus for sequentially backwashing a plurality of seriate filter beds
US5362384A (en) * 1993-07-14 1994-11-08 Aqua-Aerobic Systems, Inc. Multi-cell filter apparatus and turbidity monitor

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4082664A (en) * 1976-07-22 1978-04-04 Ecodyne Corporation Filter and method
US4141824A (en) * 1977-10-25 1979-02-27 Midcon Pipeline Equipment Co. Tangentially fed upflow sand filter method and apparatus
US4591436A (en) * 1981-12-23 1986-05-27 Cojafex B.V. Apparatus for separation of suspensions from a fluid under pressure
US5089117A (en) * 1990-08-01 1992-02-18 Infilco Degremont Inc. Apparatus for sequentially backwashing a plurality of seriate filter beds
US5362384A (en) * 1993-07-14 1994-11-08 Aqua-Aerobic Systems, Inc. Multi-cell filter apparatus and turbidity monitor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110734125A (zh) * 2019-11-12 2020-01-31 东莞市玮霖环保科技有限公司 可调水位的高效型滤池反冲洗方法及结构
CN110734125B (zh) * 2019-11-12 2024-05-28 广东玮霖环保科技有限公司 可调水位的高效型滤池反冲洗方法及结构

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