CN1442378A - Sewage treatment plant sludge harmless sintering treatment method - Google Patents
Sewage treatment plant sludge harmless sintering treatment method Download PDFInfo
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- CN1442378A CN1442378A CN 02104109 CN02104109A CN1442378A CN 1442378 A CN1442378 A CN 1442378A CN 02104109 CN02104109 CN 02104109 CN 02104109 A CN02104109 A CN 02104109A CN 1442378 A CN1442378 A CN 1442378A
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Abstract
An innoxious sinter process for treating the mud from sewage treatment plant includes such steps as proportioning raw materials including said mud as main material to ensure enough Si content, dewatering, drying, granulating by 15-20 mm, and sintering at 1100-1250 deg.C for 10-15 min to obtain haydites.
Description
Technical field that the present invention belongs to
The invention belongs to a kind of method of the sewage sludge harmlessness sintering processes to the municipal sewage plant, its also is a kind of method of using the sewage sludge harmlessness sintering to manufacture light ceramic simultaneously.
The prior art background
Adopt the dewatered sludge of sintering processing method exploitation municipal sewage plant, since the end of the eighties in last century, begun the someone and study, and too much piece of writing public technology bibliographical information has been arranged.In the prior art that has disclosed, the emphasis of research is that dewatered sludge is developed as new material of construction resource.But when the exploitation sludge resource, not only to solve the sintering technology of mud, the secondary pollution that also will avoid mud in exploitation is used, to take place simultaneously.And having sophisticated sewage sludge sintering technology concurrently, the innovative technology that secondary pollution can in use not take place again the mud goods is present research direction.Discover according to the contriver, in the dewatered sludge of municipal sewage plant, contain various heavy, because sewage source difference, contained heavy metal composition and content also are not quite similar in the mud, metropolitan sewage also has industrial sewage based on sanitary sewage, and heavy metal content is low in the mud after sanitary sewage disposal, and in the mud after industrial sewage is handled, the content height of heavy metal.The contriver is according to the analysis-by-synthesis to the detected result of the whole sludge of sewage treatment plants in certain big city, and its contained heavy metal and content can see the following form:
| Project | Numerical value (mg/kg burns and loses the back dry-matter) | Project | Numerical value (mg/kg burns and loses the back dry-matter) |
| Copper and compound thereof | 480～5257 | Arsenic and compound thereof | 0.04～115 |
| Lead and compound thereof | 150～586 | Potassium and compound thereof | 2600～13140 |
| Zinc and compound thereof | 1160～11540 | Sodium and compound thereof | 5600～10000 |
| Cadmium and compound thereof | 4～2971 | Iron and compound thereof | 52000～102860 |
| Chromium and compound thereof | 260～5600 | Manganese and compound thereof | 1280～2114 |
| Mercury and compound thereof | 0.6～76 | Calcium and compound thereof | 36000～85700 |
| Nickel and compound thereof | 300～630 | Magnesium and compound thereof | 16000～28600 |
| Aluminium and compound thereof | 58800～116270 |
Each metropolitan sludge of sewage treatment plants composition can be different, but it is representative to go up the data of showing.
In the prior art, reported that the employing high temperature incineration can eliminate deleterious organic substance in the mud, and also had report to use sewage sludge sintering to prepare building porcelain granule; But using mud to prepare in the report of building porcelain granule, to this ceramic product whether the stripping of heavy metal secondary can not take place in use carried out research targetedly, thereby contained heavy metal stripping meeting produces secondary pollution problem in the mud goods, inreal the solution.
The content of invention
The objective of the invention is to propose a kind of technical scheme that adopts sintering method Treating Municipal Sewage treatment plant mud, make the agglomerating goods can be used as material of construction and use, and the heavy metal stripping does not in use take place second environmental pollution.
The present invention adopts the technical scheme of the mud of sintering method Treating Municipal Sewage treatment plant, and it is a kind of method of manufacturing light ceramic simultaneously, its technical process comprise with mud be main raw material mix, dehydration, drying and moulding, sinter product into; Content of the present invention is the silicon components in proportions that comprises in the raw material after mix, make its proportional range that after burning mistake, can form the silicate of silicate glass phase be: 50%～60%, the material fineness scope is: 2～4%, the suitable particle size range of mixing moulding granularity is 15～20mm, at the one-tenth Tao Wendu of calcining kiln kiln roasting section is 1100～1250 ℃, and the agglomerating time is 10～15 minutes.
According to technical solution of the present invention, lose back SiO as moisture percentage in sewage sludge 75～85%, burning that raw material uses
2Content 42～45%, fineness are 2.5～3.5%, and clay water ratio 10～20%, burning are lost back SiO
2Content 66～70%, fineness are 3～4%, and the weight part ratio of the two is 3～5: 1.According to technical solution of the present invention, the flyash of the heat power plant that can also in aforementioned base materials, be mixed, it burns and loses back SiO
2Content 53～56%, fineness are 2.0～2.2%, and then dewatered sludge, flyash and clay three's weight ratio is 3～5: 1.5～2.5 in the raw material: 1.For making the product of burning till become suitable building porcelain granule, can also add 1～3 ‰ fineness according to technical solution of the present invention in the flyash of aforementioned schemes is 2.0～2.2% carborundum.
One of embodiments of the invention:
The present embodiment raw material adopts dewatered sludge, power plant fly ash and clay to be mixed, and confirms the consolidation of heavy metal in the relative mud of silicate glass.
Present embodiment is selected the mud of two kinds of different sourcess for use, and to the requirement of silicate component content with through detecting raw sludge, flyash, the clay mesosilicic acid salt actual content of learning, definite mixed ratio is according to the present invention:
Mud: flyash: clay=5: 2: 1, under oxygen free condition, fire two batches of finished product according to the proportioning raw materials of this test with High Temperature Furnaces Heating Apparatus.Because the heavy metal of other outside desilicate composition proportion is not quite similar in raw material, the result who these two groups of finished product is carried out the leach liquor test is also inequality.The concrete outcome of leach liquor experiment sees the following form:
| Project | GB5085.3-1996 leach liquor maximum permissible concentrations (mg/l) | Mud (mg/kg) | Haydite leach liquor (mg/l) | ||
| ??I | ???II | ????I | ???II | ||
| Mercury and compound thereof (in total mercury) | ????0.05 | ??0.0278 | ???0.2309 | ????＜0.000 ????2 | ???0.0028 |
| Lead and compound thereof (in total lead) | ????3 | ??43.73 | ???54.28 | ????0.019 | ???0.018 |
| Cadmium and compound thereof (in total cadmium) | ????0.3 | ??286.17 | ???483.06 | ????0.02 | ???0.0074 |
| Total chromium | ????10 | ??900.7 | ???844.1 | Do not detect | ???0.019 |
| Sexavalent chrome | ????1.5 | ??167.53 | ???101.23 | Do not detect | ???0.0051 |
| Copper and compound thereof (in total copper) | ????50 | ??2201 | ???2183 | ????0.131 | ???0.044 |
| Zinc and compound thereof (in total zinc) | ????50 | ??2959 | ???2746 | ????0.112 | ???0.037 |
| Nickel | ????10 | ??143.70 | ???142.00 | Do not detect | ???0.049 |
| Arsenic | ????1.5 | ??238.47 | ???442.65 | ????0.0013 | ???0.0092 |
| Inorganic fluoride | ????50 | ??315.84 | ???354.69 | ????0.28 | ???0.12 |
| Prussiate | ????1.0 | ????＜0.002 | ???＜0.002 | ||
Above-mentioned leach liquor assay can prove: according to technical solution of the present invention, through 1250 ℃ of haydites that high temperature sintering drew, heavy metal and toxic substance all are lower than the leach liquor standard of GB5085.3-1996 standard code in its leach liquor behind use sewage treatment plant dewater sludge adding flyash and the clay.This presentation of results technical solution of the present invention has realized the purpose of invention.
The test detected result that these two groups of finished product are carried out mechanical property is:
| Project | First | Second batch | |
| Accumulative total screening (%) | ?20.0(mm) | 0.0 | ?0.0 |
| ?16.0(mm) | 2.92 | ?3.7 | |
| ?10.0(mm) | 95.92 | ?91.7 | |
| ?5.0(mm) | 99.98 | ?99.7 | |
| ?2.5(mm) | 100.0 | ?100.0 | |
| Tap density (kg/m 3) | 582 | ?685 | |
| Particle unit weight (kg/m 3) | 964 | ?1159 | |
| Cylindrical compress strength (Mpa) | 6.0 | ?6.3 | |
| 1 hour water-intake rate (%) | 3.0 | ?1.29 | |
This test-results has also shown simultaneously, uses the finished product haydite of mud preparation to reach " light-weight aggregate and test method thereof " (GB/T17431.2-1998) 600 grades of haydite standards according to technical solution of the present invention, can do the load-bearing light skeletal.Two of embodiments of the invention:
By observation and analysis to one of embodiment, confirmed the consolidation that silicate composition that technical solution of the present invention proposes produces heavy metal in the high-temperature calcination process, the heavy metal in the burned material can not polluted environment in stripping.The purpose of present embodiment is that raw sludge is used in checking, i.e. the mud of dewatered sludge before its digestion process is with the feasibility of clay according to the technology of the present invention mixed sintering common light duty haydite.
This routine raw material uses the raw sludge and the clay of sewage work.To the requirement of raw material mesosilicic acid salts contg, and the raw sludge that uses and the actual content of clay mesosilicic acid salt component are that 3: 1 weight ratio is mixed according to mud and clay blending ratio according to the present invention.Mud added in proportion with clay mix in the stirred pot, stir after 2 hours to squeeze in the water extracter and dewater with pump, material extruder grain after the dehydration, dry then, treat that the particle water ratio reduces to 35～45% laggard klining systems, unit time material loading amount is 0.8 ton/hour, 1100～1150 ℃ of firing temperatures.
The leach liquor detected result of burning till product is leach liquor standards that heavy metal and toxic substance all are lower than the GB5085.3-1996 standard code in the leach liquor.
The physical and mechanical property test-results of burning till product is as follows:
This test-results shows that the finished product haydite has reached " light-weight aggregate and test method thereof " (GB/T17431.2-1998) 600 grades of haydite standards, can do the non-bearing light aggregate.The inner observation of the haydite that burns till found that a lot of tiny holes are arranged, and foaming effect is better, can satisfy the requirement of common light-weight aggregate.
| Project | Numerical value | |
| Accumulative total screening (%) | 20.0(mm) | |
| 16.0(mm) | ||
| 10.0(mm) | 0.0 | |
| ?5.0(mm) | 100 | |
| ?2.5(mm) | ||
| Tap density (kg/m 3) | 650 | |
| Particle unit weight (kg/m 3) | 1265 | |
| Cylindrical compress strength (MPa) | 4.0 | |
| 1 hour water-intake rate (%) | 16.3 | |
Outstanding substantive distinguishing features and the obvious improvement that the present invention is compared with prior art had is:
Is the raw material baking ceramsite according to evidence with mud, in sintering process, is molten state at the band haydite that becomes to make pottery, and the inorganic salt composition in the mud is Na for example
2O, ferric oxide, Al
2O
3, SiO
2Deng eutectic point be 980 ℃, wherein tangible solidification is arranged, and is difficult to be dissolved by the heavy metal of silicate glass concrete mutually through the heavy metal in 1150～1250 ℃ of relative mud of section agglomerating silicate glass of become making pottery.Therefore avoiding the finished product of firing sludge haydite to produce the approach of the secondary pollution of heavy metal stripping, is to utilize the silicate composition in the mud in sintering process that the heavy metal in the raw material is fixed fully.Simple mud or the be mixed clay or the flyash that is mixed of using, on the meaning of avoiding the heavy metal stripping, the ratio of the silicate composition that depends in the raw material to be contained.Technical solution of the present invention is that the contriver is through repeatedly testing the preferred plan that draws, both satisfied the requirement of using as material of construction according to technical solution of the present invention agglomerating sludge ceramsite, make in the mud heavy metal basically all by the silicate glass concrete mutually simultaneously, avoided in the haydite goods stripping of heavy metal secondary the pollution of environment.And the high temperature up to 1150～1250 ℃ when firing sludge ceramsite can make the organic substance perfect combustion in the mud, has eliminated organic pollution.It is feasible that the content that should be noted that raw material mesosilicic acid salt in the potting process is higher than the ratio that the present invention provides, and improves the content of raw material mesosilicic acid salt, just needs clays or the high batchings of other silicate contents of adding more, and the usage quantity of mud is reduced; But the objective of the invention is to make under the prerequisite of recycling sludge, make the mud goods innoxious, therefore from being convenient to use in a large number the starting point of mud, the technical scheme that the present invention provides has reached the purpose of invention.
According to provided by the invention to qualification based on the silicate composition that raw material was contained of mud, the i.e. silicon components in proportions that comprises in the raw material after mix, make its proportional range that after burning mistake, can form the silicate of silicate glass phase be: 50%～60%, again according to mud and to the mensuration of clay, flyash mesosilicic acid salts contg, could use mud to do raw material merely in the time of can determining to fire sludge ceramsite, raw material perhaps be mixed the suitable proportioning of mud and flyash and/or clay; The present invention also limits the fineness and the moulding granularity of raw material, and more than considering under the situation of various necessary technology conditions to the selection of the temperature and time of ceramsite sintering; This comprehensive technical measures can guarantee that the silicate glass that forms is fixed fully with the heavy metal in the raw sludge in sintering process, be to realize the necessary technical measures of the object of the invention.These technical characterictics of technical solution of the present invention are that prior art does not have to disclose, so the present invention has possessed the outstanding substantive distinguishing features inequality with prior art.And the innoxious and recycling treatment problem that method solves the dewatered sludge of selected municipal sewage plant is fired in the present invention's employing, will greatly save the sludge treatment expense, land resources consumption and the generation secondary pollution of having avoided land-fill method to cause.The present invention program is conceived to the effect that mud mesosilicic acid salt component offsets the removing heavy metals secondary pollution, simultaneous verification use the feasibility of the raw sludge in the sewage disposal, the employing technical solution of the present invention can be cancelled the digestion operation in the sludge treatment, reduces the sludge treatment cost.These advantages have shown the obvious improvement that the present invention had.
Claims (4)
1, a kind of method to the innoxious sintering processes of sludge from wastewater treatment plant, it is a kind of method of manufacturing light ceramic simultaneously, its technical process comprise with mud be main raw material mix, dehydration, drying and moulding, sinter product into; It is characterized in that the silicon components in proportions that comprises in the raw material after mix, make it burning the proportional range that can form the silicate of silicate glass phase after losing be: 50%～60%; The material fineness scope is: 2～4%, and the suitable particle size range of mixing moulding granularity is 15～20mm; At the one-tenth Tao Wendu of calcining kiln kiln roasting section is 1100～1250 ℃, and the agglomerating time is 10～15 minutes.
2, the method for sewage sludge harmlessness sintering processes as claimed in claim 1 is characterized in that moisture percentage in sewage sludge 75～85%, burning mistake back SiO that raw material uses
2Content 42～45%, fineness are 2.5～3.5%, and clay water ratio 10～20%, burning are lost back SiO
2Content 66～70%, fineness are 3～4%, and the weight part ratio of the two is 3～5: 1.
3, the method for sewage sludge harmlessness sintering processes as claimed in claim 2, the flyash of the heat power plant that it is characterized in that in raw material, being mixed, it burns and loses back SiO
2Content 53～56%, fineness are 2.0～2.2%, and then dewatered sludge, flyash and clay three's weight ratio is 3～5: 1.5～2.5 in the raw material: 1.
4, the method for sewage sludge harmlessness sintering processes as claimed in claim 3 is characterized in that adding 1～3 ‰ fineness and is 2.0～2.2% carborundum in flyash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021041091A CN1191206C (en) | 2002-03-04 | 2002-03-04 | Sewage treatment plant sludge harmless sintering treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021041091A CN1191206C (en) | 2002-03-04 | 2002-03-04 | Sewage treatment plant sludge harmless sintering treatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1442378A true CN1442378A (en) | 2003-09-17 |
| CN1191206C CN1191206C (en) | 2005-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021041091A Expired - Lifetime CN1191206C (en) | 2002-03-04 | 2002-03-04 | Sewage treatment plant sludge harmless sintering treatment method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100383071C (en) * | 2006-01-25 | 2008-04-23 | 中国地质大学（武汉） | Sludge microcrystalline glass and its preparation method |
| CN102358704A (en) * | 2011-07-21 | 2012-02-22 | 沈阳航空航天大学 | Method for preparing ceramsite by sintering high chromium-contaminated soil |
| CN102786319A (en) * | 2012-08-15 | 2012-11-21 | 彭尹华 | Novel sludge ceramic aggregate production method |
| CN103539426A (en) * | 2013-09-30 | 2014-01-29 | 环境保护部华南环境科学研究所 | Method of preparing ceramsite by utilizing municipal sewage plant sludge and waste glass |
| CN105541380A (en) * | 2015-12-21 | 2016-05-04 | 中国科学院过程工程研究所 | Fly ash coated sludge ceramsite and preparation method therefor |
-
2002
- 2002-03-04 CN CNB021041091A patent/CN1191206C/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100383071C (en) * | 2006-01-25 | 2008-04-23 | 中国地质大学（武汉） | Sludge microcrystalline glass and its preparation method |
| CN102358704A (en) * | 2011-07-21 | 2012-02-22 | 沈阳航空航天大学 | Method for preparing ceramsite by sintering high chromium-contaminated soil |
| CN102786319A (en) * | 2012-08-15 | 2012-11-21 | 彭尹华 | Novel sludge ceramic aggregate production method |
| CN103539426A (en) * | 2013-09-30 | 2014-01-29 | 环境保护部华南环境科学研究所 | Method of preparing ceramsite by utilizing municipal sewage plant sludge and waste glass |
| CN105541380A (en) * | 2015-12-21 | 2016-05-04 | 中国科学院过程工程研究所 | Fly ash coated sludge ceramsite and preparation method therefor |
| CN105541380B (en) * | 2015-12-21 | 2018-03-23 | 中国科学院过程工程研究所 | A kind of flyash cladding sludge ceramsite and preparation method thereof |
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| Publication number | Publication date |
|---|---|
| CN1191206C (en) | 2005-03-02 |
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Granted publication date: 20050302 |