AU612250B2 - Improved conversion of septic tanks and holding wells to secondary treatment - Google Patents
Improved conversion of septic tanks and holding wells to secondary treatment Download PDFInfo
- Publication number
- AU612250B2 AU612250B2 AU32752/89A AU3275289A AU612250B2 AU 612250 B2 AU612250 B2 AU 612250B2 AU 32752/89 A AU32752/89 A AU 32752/89A AU 3275289 A AU3275289 A AU 3275289A AU 612250 B2 AU612250 B2 AU 612250B2
- Authority
- AU
- Australia
- Prior art keywords
- holding
- holding well
- aeration
- fan
- septic
- 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
Links
- 238000006243 chemical reaction Methods 0.000 title description 4
- 238000005273 aeration Methods 0.000 claims description 20
- 239000010865 sewage Substances 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 241000196324 Embryophyta Species 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 244000005700 microbiome Species 0.000 description 5
- 239000002351 wastewater Substances 0.000 description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- 238000005276 aerator Methods 0.000 description 4
- 239000000460 chlorine Substances 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 239000010802 sludge Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000005660 chlorination reaction Methods 0.000 description 2
- 238000009293 extended aeration Methods 0.000 description 2
- 230000002262 irrigation Effects 0.000 description 2
- 238000003973 irrigation Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- YRIZYWQGELRKNT-UHFFFAOYSA-N 1,3,5-trichloro-1,3,5-triazinane-2,4,6-trione Chemical compound ClN1C(=O)N(Cl)C(=O)N(Cl)C1=O YRIZYWQGELRKNT-UHFFFAOYSA-N 0.000 description 1
- 241000371652 Curvularia clavata Species 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- 235000012206 bottled water Nutrition 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000010840 domestic wastewater Substances 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229950009390 symclosene Drugs 0.000 description 1
- 238000009423 ventilation 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
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/14—Activated sludge processes using surface aeration
- C02F3/16—Activated sludge processes using surface aeration the aerator having a vertical axis
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01C—PLANTING; SOWING; FERTILISING
- A01C3/00—Treating manure; Manuring
- A01C3/02—Storage places for manure, e.g. cisterns for liquid manure; Installations for fermenting manure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/25—Mixers with both stirrer and drive unit submerged in the material being mixed
-
- 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
- C02F3/20—Activated sludge processes using diffusers
-
- 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
- C02F3/20—Activated sludge processes using diffusers
- C02F3/205—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Organic Chemistry (AREA)
- Soil Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental Sciences (AREA)
- Treatment Of Biological Wastes In General (AREA)
Description
S11111'DII ill. I i. i ;i ii 11 1 n i COMMONWEALTH OF AUSTRALIA Patent Act 1952 6 2 2 COMPLETE SPECIFICATION
(ORIGINAL)
Class Int. Class Application Ilumber Lodged Complete Specification Lodged Accepted Published Priority: Related Art 0* Name of Applicant Address of Applicant ROBERT GRENVILLE SHAW 40 Westbourne Street, Drummoyne, New South Wales, Australia Actual Inventor Address for Service F.B. RICE CO., Patent Attorneys, 28A Montague Street, BALMAIN. 2041.
Complete Specification for the invention entitled: "IMPROVED CONVERSION OF SEPTIC TANKS AND HOLDING WELLS TO SECONDARY TREATMENT" The following statement is a full description of this invention including the best method of performing it known to Me:i- i -I TO: The Commissioner of Patents, COMMONWEALTH OF AUSTRALIA
SIJ
-2 The present invention relates to an improved septic tank and holding well sewage treatment installation for the aerobic treatment of waste water.
It is common practice in unsewered country areas to install septic tanks to partially anaerobically treat domestic waste water prior to disposal in soakaway trenches.
In rocky or clay soils or in suburban areas it is not practical to use soakaway trenches for disposal and holding wells are installed to collect septic effluent so that it can be transported by tanker to the nearest sewage works for full secondary treatment for river discharge. Some miniature secondary treatment plants for single households have been installed in unsewered areas so that the householder can use the secondary treated waste water for watering the garden. This reduces the householders .potable water usage and eliminates the requirement for tankers. However, these miniature plants have proved expensive to install costing between $3,500 and $6,000. This high cost makes purchase of one of these miniature plants uneconomical for the typical householder. This cost S is largely due to the complexity of the secondary treatment technique used in these plants. A number of stages in watertight compartments are normal.
The present invention in a first aspect consists in a septic tank and holding well sewage treatment installation the improvement comprising an aeration means projecting downward through an aperture in a roof of the holding well to an effective level; a pump disposed within the holding well and adapted, 30 when actuated, to reduce the level of waste water in the A holding well to a level at or above the effective level; and means to intermittently activate the aeration means and the pump.
In a preferred embodiment of the present invention Declarant's Name S F. B. RICE CO PATENT ATTORNEYS This form Is suitable for an'y type of Patent Application. No legalisation required.
"'p 0@ *0 9 .9 9 3 the aeration means is an agitator and in particular the agitator is a screw impeller. Preferably there is also positioned within the holding tank a deflector to reduce the amount of splashing caused when the aeration means is actuated.
In a preferred embodiment a fan is positioned in the aperture of the roof of the holding well to ventilate the headspace in the holding well. Preferably, when the aeration means is an agitator, the fan is driven by the same motor that drives the agitator.
In yet another embodiment the pump is actuated by a float switch. In a still further embodiment the effluent from the holding well is subjected to a further treatment in a chlorination tank.
15 In a second aspect the present invention consists in aeration means for insertion into the holding well of a septic tank and a holding well sewage treatment installation through an opening in a roof thereof, the aeration means including a mounting plate having an 20 aperture therein, a motor mounted on a first side of the mounting plate and having a drive shaft which extends through the aperture substantially perpendicular to the plane of the mounting plate, a screw impeller mounted on the free end of the shaft and projecting from a second side of the mounting plate, a fan positioned on the shaft intermediate its ends and within the aperture of the mounting plate, and a pump disposed on the said second side of the mounting plate adjacent the screw impeller and having outlet means which pass through the mounting plate to the one side thereof.
In a preferred embodiment of this aspect of the invention the pump is provided with a float switch. In a further preferred embodiment a deflector is mounted on the drive shaft intermediate the fan and the screw impeller.
This invention may be applied as a conversion -4technique for existing septic tanks and holding wells and requires no watertight partitions and thereby simplifies the secondary treatment into a single stage. Because of this simplicity the conversion of existing holding wells (or septic tanks) is achieved by replacing the existing access manhole cover with a modified manhole on which are mounted an aeration means and a discharge pump. The aeration means and discharge pump may be controlled by two plug-in 24 hour timers and a level switch so that the converted tank can be operated as a miniature intermittent extended aeration plant. This type of process is commonly used in New South Wales for sewage treatment for small townships of 1,000 to 4,000 persons. The process involves aeration, settlement and discharging on a timed cycle typically 1 1/2 hours aeration, 1 hour settlement and 1/2 .i hour discharge. This process avoids having to partition treatment in aeration, settlement and sludge digestion compartments as commonly used on larger plants (e.g.
plants designed to treat effluent from 25,000 persons).
The intermittent extended aeration plants have comparatively long hydraulic detention typically 40 hours as compared to that of more complex treatment, plants to 20 hours). The typical septic tank/holding well installation has approximately one week capacity so this extra detention time does not present a problem.
Hereinafter given by way of example only is a 5.55 preferred embodiment of the present invention described with reference to the accompanying drawings, in which:- Referring to Fig. 1 the improved sewage treatment S5 installation comprises a septic tank 8 and a holding well 9. The holding well 9 has an opening in the roof over which is positioned a mounting plate 10 which is provided with an aperture 11. Projecting vertically through the aperture 11 is a combined agitator and fan 14. The combined agitator and fan 14 comprises a motor 15 and support means (not shown) positioned above the mounting plate 10, a fan 16 positioned within the aperture 11 for ventillating the headspace of the holding well 9, a deflector 17 positioned between the fan 16 and the waste water to prevent splashing, and screw impeller 18 positioned below the deflector 17 and extending into the waste water to an effective level to lift the water and throw it out sideways. The spray of droplets and splashing as the droplets hit the water, when the combined agitator and fan 14 is actuated, results in a large surface area of water in contact with air in the headspace of the holding well 9. This allows for aerobic treatment of the septic effluent.
Disposed within the holding tank 9 is a submersible discharge pump 12, complete with an integral float switch S"13. The discharge pump 12 is provided with a discahrge S pipe 21 which passes through the mounting plate In operation septic effluent enters the holding well 9 in the normal way via entry pipe 19. During the 20 aeration period the contents of the holding well 9 are well mixed and aerated and the septic effluent is mixed with a culture of microorganisms (activated sludge). In the presence of dissolved oxygen from the aeration the effluent is digested aerobically by the microorganisms
S..
present in the activated sludge. After approximately 1 1/2 hours aeration the combined aerator and fan 14 is turned off by a time switch (not shown) (the aerator time switch) and the microorganism culture settles to the "bottom two thirds of the holding well leaving a clear 30 layer of secondary treated water. Settlement takes approximately one hour and septic effluent continues to enter the holding well 9 during this period via entry pipe 19 and is deflected down into the settled microorganisms via a T-pipe 20. Residual dissolved oxygen and also dissolved nitrate is used by the microorganisms during the 6 settlement period to continue purification of the water.
At the end of the settlement period another time switch (not shown) (the discharge pump time switch) starts the discharge pump 12 which pumps the clear treated water from the top of the tank via discharge pipe 21. Depending on the amount of water that has entered the holding well in the previous aeration and settlement period it takes typically up to half an hour to discharge the treated water. The discharge pump 12 continues to run until level switch 13 stops it. At the end of the discharge period of half an hour the discharge pump time switch deenergises the discharge pump 12 and the aerator time switch starts the combined aerator and fan 14 for a further period of aeration.
15 In this way septic effluent is continuously treated a but discharged intermittently to irrigation sprays in the :4 householders garden. Subsequent tertiary treatment using chlorine is often required to sterilise the effluent. In Swhich case, the secondary treated effluent could be S 20 discharged to a chlorination tank (not shown) via a tablet chlorinator using solid chlorine in the form of trichloro-isocyanuric acid. A further submersible pump with level switch and time switch can then be used to ensure a further half hour chlorine treatment period in the chlorine tank prior to irrigation spraying on the •V householders garden. The ventilation fan 16 blows fresh air into the tank which escapes via the normal holding well vent 22.
0O o a A 4 i 1
Claims (3)
- 2. Aeration means as claimed in claim 1 in which the pump includes a float switch.
- 3. Aeration means as claimed in claim 1 or 2 in which a deflector is mounted on the drive shaft in a position intermediate the fan and the screw impeller.
- 4. An aeration means for insertion'into the holding well of a septic tank and holding well sewage treatment ne" installation substantially as hereinbefore described with reference to Fig. i. DATED this 10 day of April 1989 tol ROBERT GRENVILLE SHAW Patent Attorneys for the Applicant: F.B. RICE CO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU32752/89A AU612250B2 (en) | 1985-10-04 | 1989-04-12 | Improved conversion of septic tanks and holding wells to secondary treatment |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AUPH2752 | 1985-10-04 | ||
| AU63428/86A AU585654B2 (en) | 1985-10-04 | 1986-10-04 | Improved conversion of septic tanks and holding wells to secondary treatment |
| AU32752/89A AU612250B2 (en) | 1985-10-04 | 1989-04-12 | Improved conversion of septic tanks and holding wells to secondary treatment |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU63428/86A Division AU585654B2 (en) | 1985-10-04 | 1986-10-04 | Improved conversion of septic tanks and holding wells to secondary treatment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU3275289A AU3275289A (en) | 1989-08-03 |
| AU612250B2 true AU612250B2 (en) | 1991-07-04 |
Family
ID=25622215
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU32752/89A Ceased AU612250B2 (en) | 1985-10-04 | 1989-04-12 | Improved conversion of septic tanks and holding wells to secondary treatment |
Country Status (1)
| Country | Link |
|---|---|
| AU (1) | AU612250B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0221354A1 (en) * | 1985-10-31 | 1987-05-13 | Leonhard Dipl.-Ing. Fuchs | Process using a screw aerator for waste water aeration |
-
1989
- 1989-04-12 AU AU32752/89A patent/AU612250B2/en not_active Ceased
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0221354A1 (en) * | 1985-10-31 | 1987-05-13 | Leonhard Dipl.-Ing. Fuchs | Process using a screw aerator for waste water aeration |
Also Published As
| Publication number | Publication date |
|---|---|
| AU3275289A (en) | 1989-08-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |