WO1994001369A1 - A method of dewatering for sludge - Google Patents
A method of dewatering for sludge Download PDFInfo
- Publication number
- WO1994001369A1 WO1994001369A1 PCT/FI1993/000283 FI9300283W WO9401369A1 WO 1994001369 A1 WO1994001369 A1 WO 1994001369A1 FI 9300283 W FI9300283 W FI 9300283W WO 9401369 A1 WO9401369 A1 WO 9401369A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- peat
- sludge
- dry substance
- accordance
- mixed
- Prior art date
Links
- 239000010802 sludge Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003415 peat Substances 0.000 claims abstract description 37
- 239000000126 substance Substances 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 230000006835 compression Effects 0.000 claims abstract description 10
- 238000007906 compression Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims 1
- 239000007787 solid Substances 0.000 claims 1
- 238000009264 composting Methods 0.000 description 9
- 241000196324 Embryophyta Species 0.000 description 7
- 238000000746 purification Methods 0.000 description 6
- 239000010865 sewage Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 210000003850 cellular structure Anatomy 0.000 description 2
- 239000002274 desiccant Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000736285 Sphagnum Species 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002361 compost Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 229920000867 polyelectrolyte Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000035943 smell Effects 0.000 description 1
- 239000010902 straw 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
- C02F11/125—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using screw filters
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
Definitions
- the object of the invention is a method for dewatering sludge, in which method the sludge is mixed with peat, the dry substances being calculated as 20 - 150 % and after which the mixture is compressed mechanically to separate the water component from it.
- the invention is particularly related to the treatment of sewage cleaning plant sludge, but is also applicable to e.g. the treatment of forest product industry fibre sludges.
- Patent Claim 895032 a method of mixing peat and sludge is presented, by means of which a mass substance is produced that does not load the environment so severely.. In it, however, the consumption of peat is very great, typically 1,6 times the amount of sludge. This means 300 - 1000 % peat dry substances in relation to the sludge dry substances. Decomposition of the sludge is also not a final solution, because the decomposed sludge still demands a drying agent, which increases the mass to be dealt with. In Finnish Patent 51338 presents the production of useful soil using decomposed sludge. Its dry substances content should be more than 10 %.
- the sludge is mixed with sand material and possibly peat, and the resulting mixture is subjected to compression.
- the sludge is squeezed through a peat filter, the filter material obtained being used for soil improvement. Excess moisture is squeezed out of the saturated filter material.
- US publication 4,659,472 presents a treatment method for sludge obtained from a sewage purification plant, by means of which a compostable mixture is obtained.
- Sawdust, finely milled peat or bark, and flocculants are thoroughly mixed into the sludge, after which the mixture is compressed by means of a belt press to separate the water from it. After this the mixture is taken to composting vessels.
- French patent publication no. 2 497 790 also presents a method for improving the drying of the sludge.
- sawdust, peat, straw, or other similar organic materials are mixed with the sludge before mechanical filtering. These prevent the mechanical filter used from becoming clogged.
- an opening size of 100 microns is typically used. The method is slow.
- the intention of the invention is to create a simpler method than previously for removing water from sludge in such a way that the amount of mass substance requiring further treatment really does diminish.
- the intention of the invention is also a simple method of operating a composting reactor.
- the characteristic features of the method in accordance with the invention are presented in the accompanying Patent Claims.
- the mixing should take place gently, so that the cellular structure of the peat is not broken.
- the peat here especially rough surface peat, has many functions. It acts as an internal filter, increases friction in the screw press, and provides a suitable amount of carbon for composting.
- the operation of the invention is based on the fact that the fibres of the sludge partly penetrate the cellular structure of the peat, when it is possible to separate the water from them by means of pressure. In other words, the compression resistance of the peat is raised by this means. At the present moment it seems that the compression in accordance with the invention cannot be achieved with any other device than a screw press.
- the peat dry substance is 35 - 65 % of the sludge dry substance.
- the dosing is from 20 % to 150 %.
- the dosing also depends on the quality of the sludge. For example, forest product industry fibre sludges may require different dosing to purification plant sewage sludges.
- the amount (vol) of peat is in the region of 1 - 100 % of the amount of sludge (vol) .
- Figure 1 shows the sludge drying process
- Figure 2 shows the construction of the internal jacket of the screw press in detail
- the sludge to be treated is led from the input pipe 1 to the mixing tank 3 , into which a suitable amount of rough surface peat, for example sphagnum moss, is dosed from silo 2.
- a suitable amount of rough surface peat for example sphagnum moss
- the dry substance content of the peat should be between 50 - 120, most advantageously 50 - 80 kg/m 3 .
- the peat should be only slightly decomposed.
- the amount of peat also depends on further treatment.
- the nitrogen - carbon ratio required for composting is adjusted at each time correctly for the amount of peat, which is the source of carbon.
- the mixed mixture is led through throttle valve 16 to the feed hopper 18 of press 6.
- flocculants i.e. polyelectrolytes are added to the mixture through connection 17 immediately after the throttle valve 16.
- the dry substance content is no longer raised, instead the intention is to clarify the filtrate.
- the mixture is further mixed by means of a slowly rotating screw coil 19. From here the mixture is led to a suitable screw press. By means of this a high pressure and non- clogging operation is achieved.
- a screw press it is possible to use e.g. the model "Tasster FA”, manufactured by the French firm Neyrtec, which is shown schematically in the figure by the reference number 6.
- Figure 2 shows an advantageous construction for the internal jacket. It consists in an axial direction of elongated components 13, between which grooves 14 are left. The edge 15 of the wings of the screw 7 pushes new peat mass along the grooves 14 and changes the mass in the grooves, filtration continuing effectively.
- the final product obtained is a firm, soil-like mass that only smells slightly, the further treatment of which is easy, no matter whether it takes place by combustion, composting, or in another manner.
- a flocculant With the aid of a flocculant the water component obtained is clearer, with a dry substance content of only 0,01 - 0, 2 %.
- the amount of peat must be increased slightly to increase friction. It is possible to put the water component back into circulation at a purification plant. Without a flocculant the dry substance content at this point rises to about 1 %.
- the compression is advantageously between 2 - 10 bar.
- the dry substance content may rise at times to between 45 - 50 %, possibly even higher. In reactor composting a 30 % dry substance content is sufficient, nor is further drying necessary.
- the sludge can be pretreated either biologically or decomposed. As such, the method can be also be used for other than organic sludges.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Treatment Of Sludge (AREA)
- Fertilizers (AREA)
Abstract
The object of the invention is a method for dewatering sludge, in which method peat is mixed into the sludge to bring their dry substance content to 20 - 150 %, and after which the mixture is compressed mechanically to separate the water component from it. In accordance with the invention the peat is mixed carefully, in such a way that its structure is not broken. Compression takes place by means of a continually operating screw press, in which there is a filtering internal jacket. The dry substance content of the peat to be mixed in is between 50 - 120 kg/m3, most advantageously 50 - 80 kg/m3.
Description
A METHOD OF DEWATERING FOR SLUDGE.
The object of the invention is a method for dewatering sludge, in which method the sludge is mixed with peat, the dry substances being calculated as 20 - 150 % and after which the mixture is compressed mechanically to separate the water component from it. The invention is particularly related to the treatment of sewage cleaning plant sludge, but is also applicable to e.g. the treatment of forest product industry fibre sludges.
At a sewage purification plant the sludge to be separated requires further treatment, because it cannot as such be dumped into nature. In accordance with a known technique peat and other drying agents can be mixed with the sludge and an attempt made to compost the mixed mass. So-called stockpile composting has increased recently, but in no sense is it a final solution. The construction of the fields is expensive and the amount of labour in their upkeep is great, nor is it possible to control nutrient emissions into the air. There are large variations in quality in the "final" product of stockpile composting. In addition, in many localities lack of space is a problem, fields of the size required cannot be located nearby, which results in transport costs.
In Patent Claim 895032 a method of mixing peat and sludge is presented, by means of which a mass substance is produced that does not load the environment so severely.. In it, however, the consumption of peat is very great, typically 1,6 times the amount of sludge. This means 300 - 1000 % peat dry substances in relation to the sludge dry substances. Decomposition of the sludge is also not a final solution, because the decomposed sludge still demands a drying agent, which increases the mass to be dealt with. In Finnish Patent 51338 presents the production of useful soil using decomposed sludge. Its dry substances content should be more than 10 %. In it the sludge is mixed with sand material and possibly peat, and the resulting mixture is subjected to compression. In Finnish Patent Application 790856 the sludge is squeezed through a peat filter, the filter
material obtained being used for soil improvement. Excess moisture is squeezed out of the saturated filter material.
US publication 4,659,472 presents a treatment method for sludge obtained from a sewage purification plant, by means of which a compostable mixture is obtained. Sawdust, finely milled peat or bark, and flocculants are thoroughly mixed into the sludge, after which the mixture is compressed by means of a belt press to separate the water from it. After this the mixture is taken to composting vessels.
French patent publication no. 2 497 790 also presents a method for improving the drying of the sludge. In it sawdust, peat, straw, or other similar organic materials are mixed with the sludge before mechanical filtering. These prevent the mechanical filter used from becoming clogged. In the filter an opening size of 100 microns is typically used. The method is slow.
The intention of the invention is to create a simpler method than previously for removing water from sludge in such a way that the amount of mass substance requiring further treatment really does diminish. The intention of the invention is also a simple method of operating a composting reactor.
The characteristic features of the method in accordance with the invention are presented in the accompanying Patent Claims. The mixing should take place gently, so that the cellular structure of the peat is not broken. The peat, here especially rough surface peat, has many functions. It acts as an internal filter, increases friction in the screw press, and provides a suitable amount of carbon for composting. The operation of the invention is based on the fact that the fibres of the sludge partly penetrate the cellular structure of the peat, when it is possible to separate the water from them by means of pressure. In other words, the compression resistance of the peat is raised by this means. At the present moment it seems that the compression in accordance with the invention cannot be achieved with any other device than a screw press.
Extremely little peat is mixed in relation to the total amount of the sludge, as in the advantageous dosing the peat dry substance is 35 - 65 % of the sludge dry substance. In any event the dosing is from 20 % to 150 %. The dosing also depends on the quality of the sludge. For example, forest product industry fibre sludges may require different dosing to purification plant sewage sludges. In any event the amount (vol) of peat is in the region of 1 - 100 % of the amount of sludge (vol) .
In what follows the invention is illustrated by reference to the accompanying figures, which clarify the method in accordance with the invention.
Figure 1 shows the sludge drying process schematically Figure 2 shows the construction of the internal jacket of the screw press in detail
The sludge to be treated is led from the input pipe 1 to the mixing tank 3 , into which a suitable amount of rough surface peat, for example sphagnum moss, is dosed from silo 2. Even though the dosing does vary according to the quality of the sludge, the dosing can be adjusted in the same place to the amount of dry substances on the basis of experience. The dry substance content of the peat should be between 50 - 120, most advantageously 50 - 80 kg/m3. The peat should be only slightly decomposed. The amount of peat also depends on further treatment. The nitrogen - carbon ratio required for composting is adjusted at each time correctly for the amount of peat, which is the source of carbon.
The mixing of the sludge and peat must take place carefully, so that the internal structure of the peat is not broken. In experiments a slowly rotating paddle mixer 4 has been proven good. For even small batches the mixing lasts several minutes.
The mixed mixture is led through throttle valve 16 to the feed hopper 18 of press 6. Before this, flocculants i.e. polyelectrolytes are added to the mixture through connection 17 immediately after the throttle valve 16. By means of this the
dry substance content is no longer raised, instead the intention is to clarify the filtrate.
In the feed hopper 18 the mixture is further mixed by means of a slowly rotating screw coil 19. From here the mixture is led to a suitable screw press. By means of this a high pressure and non- clogging operation is achieved. As a screw press it is possible to use e.g. the model "Tasster FA", manufactured by the French firm Neyrtec, which is shown schematically in the figure by the reference number 6.
In the screw press screw 7 pushes the mass in the internal jacket 8, which is perforated in the part surrounding jacket 9. Compression takes place against pressure plate 10, which allows the compressed mass out to the outlet channel 11 at the end of the cylinder. The water component leaves through connection 12 of jacket 9.
Figure 2 shows an advantageous construction for the internal jacket. It consists in an axial direction of elongated components 13, between which grooves 14 are left. The edge 15 of the wings of the screw 7 pushes new peat mass along the grooves 14 and changes the mass in the grooves, filtration continuing effectively.
During test pressing with a counter-pressure of only 3 - 4 bar a 32 % dry substance content was achieved from sewage purification plant biological sludge (not decomposed) , the dry substance content of which was 2,3 %. The peat, with a moisture content of 60 %, was mixed in such a way that 50 % of the sludge dry substance was taken as the peat dry substance.
The final product obtained is a firm, soil-like mass that only smells slightly, the further treatment of which is easy, no matter whether it takes place by combustion, composting, or in another manner.
With the aid of a flocculant the water component obtained is clearer, with a dry substance content of only 0,01 - 0, 2 %. At the same time the amount of peat must be increased slightly to increase friction. It is possible to put the water component back into circulation at a purification plant. Without a flocculant the dry substance content at this point rises to about 1 %.
The compression is advantageously between 2 - 10 bar. The dry substance content may rise at times to between 45 - 50 %, possibly even higher. In reactor composting a 30 % dry substance content is sufficient, nor is further drying necessary.
For example, at the municipal purification plant at Pieksa aki, Finland 5000 m3 of sludge with a strength of 13 % arises annually. By means of the method in accordance with the invention the amount of sludge remains 2000 m3 with a dry substance content of 37 % after drum composting, the mass obtained from which is odorless, nor does it contain any harmful bacteria.
The sludge can be pretreated either biologically or decomposed. As such, the method can be also be used for other than organic sludges.
Claims
1. A method for dewatering sludge, in which method peat is mixed into the sludge to bring their dry substance content to 20 - 150 % and after which the mixture is compressed mechanically to separate the water component from it, characterized in that the peat is mixed in such a careful way that its structure is not broken, and that the compression takes place by means of a continuously operating screw press, in which there is a filtering internal jacket, and that the dry substance content of the peat to be mixed is between 50 - 120 kg/m3, most advantageously 50 - 80 kg/m3.
2. A method in accordance with Patent Claim 1, characterized in that the mixing of the peat and sludge takes place without compression by means of a blade mixer or corresponding slow mechanical mixer.
3. A method in accordance with Patent Claims 1 - 2, characterized in that the filtrate is removed in the screw press along elongated axial grooves in the internal jacket, along which the wing of the screw pushes new solid substance, which prevents the internal jacket from becoming clogged.
4. A method in accordance with one of Patent Claims 1 - 3, characterized in that a flocculant, e.g. a suitable polymer, is mixed with the mass before compression, in order to reduce the dry substance content of the filtrate.
5. A method in accordance with Patent Claim 1 or 3, characterized in that the peat is dosed into the sludge in such a way that the dry substance content of the peat is 35 - 65 % by weight of the dry substance of the sludge.
6. A method in accordance with one of Patent Claims 1 - 5, characterized in that the compression is in the region 2 - 10 bar.
7. A method in accordance with one of Patent Claims 1 - 6, characterized in that the mixture is dried to a dry substance content of abut 30 % and composted in a drum composter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI923134A FI101292B (en) | 1992-07-08 | 1992-07-08 | Procedure for removing water from biological treated sludge |
| FI923134 | 1992-07-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1994001369A1 true WO1994001369A1 (en) | 1994-01-20 |
Family
ID=8535588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FI1993/000283 WO1994001369A1 (en) | 1992-07-08 | 1993-07-02 | A method of dewatering for sludge |
Country Status (2)
| Country | Link |
|---|---|
| FI (1) | FI101292B (en) |
| WO (1) | WO1994001369A1 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996007620A1 (en) * | 1994-09-06 | 1996-03-14 | Vapo Oy | A method and device for dewatering of sludge |
| WO1997001513A1 (en) * | 1995-06-26 | 1997-01-16 | Esko Torkkeli | Method of treating waste sludge |
| WO2000058229A1 (en) * | 1999-03-29 | 2000-10-05 | Etor Oy | Method of treating and utilizing sludge |
| WO2001028939A1 (en) * | 1999-10-22 | 2001-04-26 | Sphagnum As | A process for dewatering of sludge |
| WO2009019609A3 (en) * | 2007-07-03 | 2009-04-09 | Dominick O'reilly | An improved waste treatment system |
| US8196311B2 (en) | 2008-10-22 | 2012-06-12 | Hydrocell Technologies | Waste treatment system |
| CN111777315A (en) * | 2020-07-14 | 2020-10-16 | 张磊 | Sludge drying treatment system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2747130A1 (en) * | 1976-10-21 | 1978-04-27 | Waste Eng Syst Co Oy | PLANT FOR THE PRODUCTION OF A SOIL IMPROVEMENT PRODUCT |
| US4659472A (en) * | 1984-01-04 | 1987-04-21 | Purac Ab | Method for producing a compostable mixture of sludge from sewage purification plants |
| SE468048B (en) * | 1988-10-25 | 1992-10-26 | Vapo Oy | Process and mixer for mixing peat and sludge to form a homogeneous mass |
-
1992
- 1992-07-08 FI FI923134A patent/FI101292B/en active
-
1993
- 1993-07-02 WO PCT/FI1993/000283 patent/WO1994001369A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2747130A1 (en) * | 1976-10-21 | 1978-04-27 | Waste Eng Syst Co Oy | PLANT FOR THE PRODUCTION OF A SOIL IMPROVEMENT PRODUCT |
| US4659472A (en) * | 1984-01-04 | 1987-04-21 | Purac Ab | Method for producing a compostable mixture of sludge from sewage purification plants |
| SE468048B (en) * | 1988-10-25 | 1992-10-26 | Vapo Oy | Process and mixer for mixing peat and sludge to form a homogeneous mass |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996007620A1 (en) * | 1994-09-06 | 1996-03-14 | Vapo Oy | A method and device for dewatering of sludge |
| WO1997001513A1 (en) * | 1995-06-26 | 1997-01-16 | Esko Torkkeli | Method of treating waste sludge |
| RU2136615C1 (en) * | 1995-06-26 | 1999-09-10 | Торккели Эско | Method of processing liquid waste |
| US5972058A (en) * | 1995-06-26 | 1999-10-26 | Torkkeli; Esko Ilmari | Method of treating waste sludge |
| WO2000058229A1 (en) * | 1999-03-29 | 2000-10-05 | Etor Oy | Method of treating and utilizing sludge |
| US6837999B1 (en) | 1999-10-22 | 2005-01-04 | Sphagnum As | Process for dewatering of sludge |
| WO2001028939A1 (en) * | 1999-10-22 | 2001-04-26 | Sphagnum As | A process for dewatering of sludge |
| WO2009019609A3 (en) * | 2007-07-03 | 2009-04-09 | Dominick O'reilly | An improved waste treatment system |
| GB2463628A (en) * | 2007-07-03 | 2010-03-24 | Dominick O'reilly | An improved waste treatment system |
| GB2463628B (en) * | 2007-07-03 | 2013-04-24 | Hydropress Holdings Inc | An improved waste treatment system |
| US8196311B2 (en) | 2008-10-22 | 2012-06-12 | Hydrocell Technologies | Waste treatment system |
| CN111777315A (en) * | 2020-07-14 | 2020-10-16 | 张磊 | Sludge drying treatment system |
| CN111777315B (en) * | 2020-07-14 | 2021-02-02 | 深圳市深水水务咨询有限公司 | Sludge drying treatment system |
Also Published As
| Publication number | Publication date |
|---|---|
| FI923134L (en) | 1994-01-09 |
| FI101292B1 (en) | 1998-05-29 |
| FI923134A0 (en) | 1992-07-08 |
| FI101292B (en) | 1998-05-29 |
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