GB1569926A - Sterilisation of sludges - Google Patents
Sterilisation of sludges Download PDFInfo
- Publication number
- GB1569926A GB1569926A GB33045/77A GB3304577A GB1569926A GB 1569926 A GB1569926 A GB 1569926A GB 33045/77 A GB33045/77 A GB 33045/77A GB 3304577 A GB3304577 A GB 3304577A GB 1569926 A GB1569926 A GB 1569926A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sludge
- micro
- wave heating
- heating device
- sterilising
- 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.)
- Expired
Links
- 238000004659 sterilization and disinfection Methods 0.000 title description 4
- 239000010802 sludge Substances 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 18
- 230000001954 sterilising effect Effects 0.000 claims description 8
- 244000005700 microbiome Species 0.000 claims description 6
- 244000045947 parasite Species 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000010865 sewage Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 230000003834 intracellular effect Effects 0.000 description 2
- 239000010801 sewage sludge Substances 0.000 description 2
- 239000004722 Artley Substances 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 241000242722 Cestoda Species 0.000 description 1
- 240000004808 Saccharomyces cerevisiae Species 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 239000007787 solid Substances 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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/123—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using belt or band filters
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Description
(54) STERILISATION OF SLUDGES
(71) We, SIMON-H[ARTLEY LIMITED a
British Company, of Etruria Works, Stokeon-Trent, Staffordshire do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention concerns the sterilisation of sludges containing micro-organisms and/ or parasites particularly, though not exclusively, sewage sludges.
Sewage sludges are frequently sterilised by passing same through a heated oven.
This process requires considerable energy since it is necessary for the sludges to be present in the oven for a substantial period of time to ensure that they are heated thoroughly to a sufficiently high temperature throughout their mass to achieve complete sterilisation.
The present invention is based upon an appreciation of the fact that all microorganisms and parasites contain intracellular water which can be heated preferentially by micro-waves, thereby causing rapid destruction of the organisms.
Thus according to the present invention, a method of sterilising a sludge containing micro-organisms and/or parasites comprises the step of subjecting the sludge to microwave heating.
The invention will be further apparent from the following description with reference to the single figure of the accompanying drawing which shows, by way of example only, one form of plant for treating sewage sludges in accordance with the invention.
Referring now to the drawing, it will be seen that a secondary sewage sludge derived from a conventional activated sludge treatment process is first dewatered by passage through, for example, a band press generally indicated at 10 and constructed and adapted to operate as described in our
British Patent Specification No. 1,519,234.
The sludge leaving the press at 11 will typically contain 35% by weight of solids.
A typical sewage sludge will contain a variety of micro-organisms including bacteria, viruses and yeast moulds as well as a variety of parasites ranging from singlecell organisms to large organisms such as tapeworms, for example, all of which must be destroyed in order to render the sludge sterile.
In accordance with the invention the sludge leaving the band press 10 is delivered to an endless conveying band 12 which conveys it through an elongate oven 13 equipped with electrodes 14 for subjecting the sludge to high frequency electro-magnetic radiation having a frequency of the order of 1,000 MHz, that is to micro-wave heating.
Micro-wave heating heats water preferentially including the intro-cellular water of the various organisms to be destroyed. Boiling of the intra-cellular water causes explosion of the cell walls and phsical destruction of the organisms. Also protein coagulation occurs simultaneously. These effects render the sludge sterile and this is achieved rapidly with considerably smaller energy input than is required by a conventional sterilising system.
It will be appreciated that it is not intended to limit the invention to the above example only, many variations, such as might readily occur to one skilled in the art, being possible without departing from the scope thereof, as defined in the appended claims.
Thus, for example, the sludges might be subjected to micro-wave heating under conditions of reduced pressure, in which case the sludge would need to be processed in batches or would need to be conveyed into and removed from the oven by means maintaining a seal such as by means of conveying screws, for example.
WHAT WE CLAIM IS:
1. A method of sterilising a sludge containing micro-organisms and/or parasites comprising the step of subjecting the sludge to micro-wave heating.
2. A method according to claim 1 wherein the sludge is subjected to microwave heating at atmospheric pressure.
3. A method according to claim 1 wherein the sludge is subjected to micro-wave heating at a reduced pressure.
4. A method according to claim 3 wherein the sludge is processed in batches.
5. A method according to claim 3 wherein the sludge is processed continuously.
6. Apparatus when in use for carrying out the method of claim 2 comprising a micro-wave heating device and an endless conveying band arranged to receive the sludge and convey it between the electrodes of the micro-wave heating device.
7. Apparatus for carrying out the method of claim 3 comprising a micro-wave heating device and means for introducing sludge thereto and removing sludge therefrom whilst retaining a seal against atmosphere.
8. Apparatus according to claim 7 wherein said means for introducing sludge to or removing sludge from the microwave heating device are comprised by conveying screws.
9. A method of sterilising a sludge according to claim 1 and substantially as described herein.
10. Apparatus when in use for sterilising a sludge substantially as described herein with reference to and as illustrated by the single figure of the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (10)
1. A method of sterilising a sludge containing micro-organisms and/or parasites comprising the step of subjecting the sludge to micro-wave heating.
2. A method according to claim 1 wherein the sludge is subjected to microwave heating at atmospheric pressure.
3. A method according to claim 1 wherein the sludge is subjected to micro-wave heating at a reduced pressure.
4. A method according to claim 3 wherein the sludge is processed in batches.
5. A method according to claim 3 wherein the sludge is processed continuously.
6. Apparatus when in use for carrying out the method of claim 2 comprising a micro-wave heating device and an endless conveying band arranged to receive the sludge and convey it between the electrodes of the micro-wave heating device.
7. Apparatus for carrying out the method of claim 3 comprising a micro-wave heating device and means for introducing sludge thereto and removing sludge therefrom whilst retaining a seal against atmosphere.
8. Apparatus according to claim 7 wherein said means for introducing sludge to or removing sludge from the microwave heating device are comprised by conveying screws.
9. A method of sterilising a sludge according to claim 1 and substantially as described herein.
10. Apparatus when in use for sterilising a sludge substantially as described herein with reference to and as illustrated by the single figure of the accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB33045/77A GB1569926A (en) | 1978-05-11 | 1978-05-11 | Sterilisation of sludges |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB33045/77A GB1569926A (en) | 1978-05-11 | 1978-05-11 | Sterilisation of sludges |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1569926A true GB1569926A (en) | 1980-06-25 |
Family
ID=10347796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB33045/77A Expired GB1569926A (en) | 1978-05-11 | 1978-05-11 | Sterilisation of sludges |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1569926A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659297A (en) * | 2012-05-14 | 2012-09-12 | 哈尔滨工业大学 | Microwave and PAM (Polyacrylamide) flocculating agent combined sludge dewatering method |
| CN106587564A (en) * | 2016-12-30 | 2017-04-26 | 黄山市徽州区双益环境工程有限公司 | Sludge treatment system |
-
1978
- 1978-05-11 GB GB33045/77A patent/GB1569926A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659297A (en) * | 2012-05-14 | 2012-09-12 | 哈尔滨工业大学 | Microwave and PAM (Polyacrylamide) flocculating agent combined sludge dewatering method |
| CN106587564A (en) * | 2016-12-30 | 2017-04-26 | 黄山市徽州区双益环境工程有限公司 | Sludge treatment system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19940511 |