GB2401327A - Removing contaminants from a clarified liquid stream outlet in a settling tank - Google Patents
Removing contaminants from a clarified liquid stream outlet in a settling tank Download PDFInfo
- Publication number
- GB2401327A GB2401327A GB0310536A GB0310536A GB2401327A GB 2401327 A GB2401327 A GB 2401327A GB 0310536 A GB0310536 A GB 0310536A GB 0310536 A GB0310536 A GB 0310536A GB 2401327 A GB2401327 A GB 2401327A
- Authority
- GB
- United Kingdom
- Prior art keywords
- liquor
- suspended solids
- leachate
- solids
- treatment vessel
- 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- Withdrawn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
- 239000000356 contaminant Substances 0.000 title description 2
- 239000007788 liquid Substances 0.000 title 1
- 239000007787 solid Substances 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000011010 flushing procedure Methods 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 241000894006 Bacteria Species 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 239000011368 organic material Substances 0.000 abstract 1
- 239000005416 organic matter Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2444—Discharge mechanisms for the classified liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/245—Discharge mechanisms for the sediments
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
A process for retaining solids in a treatment vessel while discharging a clarified liquor comprises a treatment vessel with an internal discharge pipe (1, Fig 1). In use, contaminated liquor enters the treatment vessel wherein a reaction takes place and suspended solids are allowed to settle at the bottom of the vessel. During the reaction and settling period some suspended solids collect in the discharge pipe and are periodically removed by a reverse flow of the clarified liquor. Preferably a pump 6 supplies a motive force to the clarified liquor which is either contained in a flushing tank 7 for removing suspended solids from the discharge pipe or held in main storage tanks. The contaminated liquor may comprise a leachate of rain water contaminated with chemicals and organic material mixed with bacteria and air. Advantageously suspended solids in the treated leachate are reduced and can therefore be discharged to a sewer or water course.
Description
Description
LTW discharge line clearing process The invention relates to a process which allows the discharge of clarified liquor from a treatment vessel without transfer of any solids.
When rain water percolates through the layers of waste it becomes contaminated with chemicals and organic matter. This water is called leachate. A leachate treatment works (LTW) is a plant designed to biologically treat the leachate emanating from a landfill site.
The chemicals contained within the leachate constitute an environmental hazard and must not contaminate any local water courses. To facilitate this, a biological treatment process is used. This involves introducing various strains of bacteria which consume the various chemicals and organic matter.
The process involves supplying the bacteria with the right quantities of food (leachate) and air (Fig 1). After a set amount of time, this mixture of leachate and bacteria is allowed to settle and all the suspended solids eventually precipitate to the bottom (Fig 2).
The leachate that remains is relatively contaminant free and can be discharged to a local sewer or watercourse. The discharge is via the internal run off pipe 1 (Fig 1). The problem is that during the reaction phase of the process and the subsequent settling period, suspended solids collect in this run off pipe (Fig 2).
Whilst the remainder of the leachate can settle out, the leachate trapped in the run off pipe 1 will settle in the pipe. This cannot be allowed to happen because the solids would then be discharged to sewer.
During the settlement period, a small amount of solids will settle in the vertical run off pipe (Fig 2). After a set amount of the settling period has taken place, the discharge pump 6 clears the settled solids out of the run off pipe 1 by reversing the motor direction (Fig 3).
The pump must be supplied with water in order that it can flush the pipe clear.
To that effect, a separate flushing tank 7 is used. This tank is filled with treated effluent during the discharge phase so that after a flushing (Fig 5), the subsequent discharge re-fills the tank (Fig 6).
After the run off pipe has been cleared, the leachate then settles for the remainder of the settlement period. The clarified leachate is then discharged, fills up the small flushing tank (Fig 6), with the balance of the treated leachate being discharged into the main treated leachate storage tanks.
Claims (3)
- Claims 1. A process for retaining solids in a treatment vessel whiledischarging clarified liquor.
- 2. A process as claimed in claim 1 which allows discharge of clarified liquor from a treatment vessel using a submerged vertical run off pipe without transfer of any solids previously suspended in the liquor.
- 3. A process as claimed in claim 1 and 2 which uses a pump and a separate tank of treated liquor as a means of flushing the run off pipe of any solids.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0310536A GB2401327A (en) | 2003-05-08 | 2003-05-08 | Removing contaminants from a clarified liquid stream outlet in a settling tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0310536A GB2401327A (en) | 2003-05-08 | 2003-05-08 | Removing contaminants from a clarified liquid stream outlet in a settling tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0310536D0 GB0310536D0 (en) | 2003-06-11 |
| GB2401327A true GB2401327A (en) | 2004-11-10 |
Family
ID=9957641
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0310536A Withdrawn GB2401327A (en) | 2003-05-08 | 2003-05-08 | Removing contaminants from a clarified liquid stream outlet in a settling tank |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2401327A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB472180A (en) * | 1936-04-01 | 1937-09-20 | William Graham Farrer | Improvements relating to sedimentation tanks or reservoirs |
| GB812882A (en) * | 1956-11-29 | 1959-05-06 | Koppers Gmbh Heinrich | Coke-quenching-water settling plant |
| GB1171800A (en) * | 1967-01-06 | 1969-11-26 | Ceskoslovenska Akademie Ved | Method of and Apparatus for Determination and Adjustment of the Optimum Dose of Coagulation Agents in Coagulation Processes. |
| US4184954A (en) * | 1979-03-23 | 1980-01-22 | Peterson Albert C | Sedimentation device and method for purifying waste water |
| US4352574A (en) * | 1978-10-12 | 1982-10-05 | Forskningsgruppe For Sjeldne Jordarter | Mixer-settler apparatus |
| WO1998019765A1 (en) * | 1996-11-01 | 1998-05-14 | Yit-Yhtymä Oy | Method and apparatus for treatment of fluid |
-
2003
- 2003-05-08 GB GB0310536A patent/GB2401327A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB472180A (en) * | 1936-04-01 | 1937-09-20 | William Graham Farrer | Improvements relating to sedimentation tanks or reservoirs |
| GB812882A (en) * | 1956-11-29 | 1959-05-06 | Koppers Gmbh Heinrich | Coke-quenching-water settling plant |
| GB1171800A (en) * | 1967-01-06 | 1969-11-26 | Ceskoslovenska Akademie Ved | Method of and Apparatus for Determination and Adjustment of the Optimum Dose of Coagulation Agents in Coagulation Processes. |
| US4352574A (en) * | 1978-10-12 | 1982-10-05 | Forskningsgruppe For Sjeldne Jordarter | Mixer-settler apparatus |
| US4184954A (en) * | 1979-03-23 | 1980-01-22 | Peterson Albert C | Sedimentation device and method for purifying waste water |
| WO1998019765A1 (en) * | 1996-11-01 | 1998-05-14 | Yit-Yhtymä Oy | Method and apparatus for treatment of fluid |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0310536D0 (en) | 2003-06-11 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |