CN1587125A - Three stage type drying and granulating integrating method for brick-making sludge - Google Patents
Three stage type drying and granulating integrating method for brick-making sludge Download PDFInfo
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- CN1587125A CN1587125A CN 200410053840 CN200410053840A CN1587125A CN 1587125 A CN1587125 A CN 1587125A CN 200410053840 CN200410053840 CN 200410053840 CN 200410053840 A CN200410053840 A CN 200410053840A CN 1587125 A CN1587125 A CN 1587125A
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Abstract
The integrated three-stage drying and granulating process for brick making sludge includes the following steps: mixing and water evaporating sludge from sewage treating yard and dredging river and lake in the stacking yard; extruding sludge into bar and coating the bar with powder; the first stage of drying in the first stoving rotary kiln; the second stage of drying in the second stoving rotary kiln; sieving in rotary sieve to obtain sludge grain of 2-4.5 mm size and the third stage of drying in the third stoving rotary kiln to obtain sludge grain as the material for baking light energy saving brick. The present invention makes best utilization of sludge resource.
Description
Technical field
The present invention relates to a kind of syllogic mummification and granulating integral method of brickmaking mud.
Background technology
The municipal sewage plant is handling trade effluent and the produced simultaneously mud of sanitary sewage, and the dredging mud in polluted river and lake also contains a large amount of organic pollutants and various heavy element (table 1, table 2, table 3, table 4) except the inorganic component that exists with mineral forms.Because the quantity of this class mud is big, and enrichment the pollutent of high density, therefore,, can bring the threat of secondary pollution to environment if can not properly handle these mud.
The mineral composition of table 1 typical urban sludge of sewage treatment plant and polluted river dredging mud
| Sample | Mineral composition (%) | Remarks | |||||
| Quartzy | Plagioclase | Potassium felspar sand | Illite | Kaolinite | Chlorite | ||
| Sludge of sewage treatment plant | ??30.1 | ???6.3 | ???22.7 | ???29.3 | ????7.0 | ????4.3 | Analyzed average in 3 years |
| River dredging mud | ??30.0 | ???12.5 | ???10.0 | ???15.0 | ????9.0 | ????15.0 | 2 sampling point analyses are average |
The chemical constitution of table 2 typical urban sewage work (trade effluent 40%, sanitary sewage 60%) mud
| Sample | Chemical constitution (%) | Remarks | |||||||||
| ???SiO 2 | ???MgO | ??CaO | ??Fe 2O 3 | ??Al 2O 3 | ??K 2O | ??Na 2O | Full nitrogen | Full phosphorus | Loss on ignition | ||
| ????1 | ???35.78 | ??3.73 | ??6.44 | ???4.68 | ??8.47 | ??0.69 | ??0.6?2 | ??1.35 | ???- | ??35.26 | Analyzed in 1993 |
| ????2 | ???35.60 | ??3.49 | ??7.75 | ??4.03 | ??8.16 | ??0.69 | ??0.62 | ???- | ???- | ??36.30 | Analyzed in 1996 |
| ????3 | ???35.10 | ??0.18 | ??5.40 | ??2.80 | ??7.20 | ??0.82 | ??0.51 | ??2.90 | ??0.86 | ??36.30 | Calendar year 2001 is analyzed |
| ????4 | ???35.12 | ??0.19 | ??5.42 | ??2.80 | ??7.20 | ???- | ??0.52 | ???- | ???- | ???- | Analyzed in 2004 |
| Mean value | ???35.40 | ??1.90 | ??6.25 | ??3.58 | ??7.76 | ??7.33 | ??0.57 | ??2.12 | ??0.86 | ??35.95 | ???- |
The content of heavy metal in the table 3 typical urban sludge of sewage treatment plant
| Project | Heavy metal (mg/kg) | Remarks | |||||||
| ????Cu | ????Pb | ?????Zn | ?????Cr | ????Cd | ??????Ni | ?????As | ????Hg | ||
| Mean value | ??326.6 | ??192.9 | ????2261 | ????296.3 | ????4.1 | ????297.4 | ????16.9 | ????3.9 | According to 4 years analysis data |
| Content range | ??236.2- ??397.2 | ??80.78 ???- ??314.0 | ????69.5- ????3790 | ????27.9- ????592.4 | ????1.35- ????7.2 | ????57.5- ????750.3 | ????8.9- ????31.9 | ????0.8- ????4.3 | |
Heavy metal and organic content in the typical polluted river dredging of table 4 mud
| Project | Heavy metal (mg/kg) | Organism (%) | Remarks | ||||||
| ???Cu | ???Pb | ????Zn | ????Cr | ????Cd | Total phosphorus | Full nitrogen | Organic | ||
| Mean value | ??268.6 | ??61.3 | ??403.5 | ??103.3 | ???0.95 | ???0.368 | ???0.483 | ???9.88 | Analytical data according to section, urban district 9 sampling points |
| Content range | ??78- ??772 | ??25- ??167 | ??194.7 ??-4701 ??0 | ??38.5- ??247 | ???0.38- ???1.47 | ???0.150- ???0.773 | ???0.269- ???0.931 | ???4.53- ???96.1 | |
At present; the method that mud mainly adopts interim heap to bury is dredged to mud and pollution river, lake that the municipal sewage plant produces by China; this not only needs enough spaces and necessary environment protection means; add transportation; make processing costs higher; and be good at finding at peri-urban and be fit to space and the place that heap buries mud, the secondary environmental pollution of Chan Shenging and problem such as land occupations is sharp-pointed day by day in a large number therefrom.Although, incinerating method is attempted to adopt in some place, make sludge reduction, but sludge incineration facility investment volume height, energy-output ratio is big, the working cost costliness, the cost that sludge incineration per ton is handled adds that mud can bring pollution to atmospheric environment when burning, according to the present situation of China generally more than 400 yuan, sludge incineration is handled and is difficult to economically bear, and is ripe not enough technically.More local hope can be with the mud as fertilizer sources, be used for agricultural or greening, but contained heavy metal has limited the adaptability that soil utilizes mud in the mud, according to studies show that, from waste water, remove the heavy metal of 1mg/L, will in mud, produce the heavy metal of 10000mg/L, adsorb a large amount of heavy metals in the river of pollution and the bottom mud in lake, as cadmium (Cd), plumbous (Pb), zinc (Zn), chromium (Cr) etc., their understand enrichment in soil, and enter food chain by the absorption of crop.Some coastal city or those have and the city of waterway mutually, ocean; may adopt mud directly to throw the disposal method in sea; but; this spissated pollutent of mud can pollute coastal waters; the marine ecosystem human foods chain of unifying is threatened; therefore, this method is subjected to environment protection circle and the public's severe criticism, is prohibited.
Along with people are more and more higher to the requirement of environmental quality, all trade effluents and city domestic sewage must be through handling, could discharge after up to standard, simultaneously in order to administer and improve the environmental quality of polluted river and water body in lake effectively, nearly all section and lake near the city needs dredging, this means that the quantity of mud will grow with each passing day.Therefore, the unique channel of scientifically handling this class mud is: carry out innoxious and the minimizing processing to mud, finally realize comprehensive utilization of resources.
We once dredged on the basis of mud physico-chemical property research at the mud that the municipal sewage plant is produced and pollution river, lake, by a large amount of practices, invented and a kind ofly utilized mud lightweight ground and high heating value (calorific value of sludge from wastewater treatment plant is 10000～35000kJ/kg; The calorific value that pollutes river, lake dredging mud is 5000～20000kJ/kg) characteristics, fire the method for light energy saving brick, and obtained national inventing patent (patent approval number: 89118046.9), thereby opened up a valid approach for the innoxious and recycling treatment of mud, the core of this invention technology is, before firing light energy saving brick, earlier mud is made granule.
Because mud that the municipal sewage plant produces and pollution river, lake dredging mud have higher water ratio (after first dehydration, the water ratio of mud is generally about 80%), therefore, mud must be through drying process before being made into granule.Traditional drying process, usually when mud reaches mummification, the organic matter fraction (source of calorific value) that can be utilized as resource in the mud, and the flocculation agent (need add when mud dewaters for the first time) that can play consolidation can be subjected to serious destruction, this has caused the available value of sludge resource to reduce on the one hand, influenced the granulating performance of mud on the other hand, made the hardness of mud granule be difficult to reach the technical requirements of firing light energy saving brick.In order to preserve organic substance contained in the mud effectively, the calorific value resource of mud can be fully utilized, simultaneously mud is become and meet the granule of firing the light energy saving brick technical requirements, this invention has proposed the syllogic mummification and the granulating integral method of brickmaking mud, not only can keep original organic matter fraction more than 95% in the mud, and sludge drying efficient is reached in the process of desired level, make mud form granule naturally, this has enough hardness and grinds the garden degree preferably.
Summary of the invention
The syllogic mummification and the granulating integral method that the purpose of this invention is to provide a kind of brickmaking mud.
The step of method is as follows:
1. be that the mud that 75～85% municipal sewage plants produce turns over mixed the evaporation 2～5 days with pollution river, lake dredging mud in the stacking field with water content, 1～5% of total water content is fallen in spontaneous evaporation;
2. will to mix evaporation back water content be 70～80% sludge from wastewater treatment plant and pollute the river, lake dredging mud passes through banded extruder through turning over, being made into diameter is the bar column of 0.6～1.0mm, through wrapping up in powder, be admitted to temperature and be 190～210 ℃ the first oven dry rotary kiln, carry out first section mummification, remove 20～30% of total water content;
3. above-mentioned mud goes out the first oven dry rotary kiln, by cooling conveyor, is admitted to temperature and is 180～200 ℃ the second oven dry rotary kiln, carries out second section mummification, removes 20～25% of total water content;
4. above-mentioned mud goes out the second oven dry rotary kiln, pass through cooling conveyor, through roto-sifter, will send the auxiliary fuel of heating stove greater than the mud granule of 4.5mm particle diameter, less than the mud granule of 2mm particle diameter as fire coal, wherein 60～80% reflux, as the powder of wrapping up in of bar column mud, 20～40% send the auxiliary fuel of heating stove as fire coal, with the mud granule of 2～4.5mm particle diameter send into temperature be 160～200 ℃ the 3rd the oven dry rotary kiln, carry out the 3rd section mummification, remove 15～20% of total water content;
5. after above-mentioned mud goes out the 3rd oven dry rotary kiln, by vibratory screening apparatus, will reflux less than the mud granule of 2mm particle diameter, as the powder of wrapping up in of bar column mud, the mud granule of 2～4mm particle diameter gets final product.
The present invention is come into operation at Jiangsu Qian Zhou, practice shows, this technology not only makes sludge of sewage treatment plant obtain effective mummification, and mud is formed naturally meet and fire the granule that light energy saving brick hardness requires, and the organic matter more than 95% is effectively preserved, thereby sludge resource is got the maximum use, when obtaining remarkable social benefit, also obtained tangible economic benefit.
Description of drawings
Accompanying drawing is the syllogic mummification and the granulating integral method schema of brickmaking mud.
Embodiment
The present invention mainly is by three groups of low temperature (160～220 ℃) anhydration system, reaches the incorporate purpose of sludge drying and granulating.The main body of every group of anhydration system is by being formed with lower device: heating stove (can fire coal, combustion gas, fuel oil), spray thermosistor, oven dry rotary kiln, tail gas vacuum fan and dedusting degasifying device.Between three groups of anhydration systems, be connected by two cooling conveyors, cooling conveyor seals, and a series of cold wind jet orifice wherein is housed.Between second cooling conveyor and the 3rd oven dry rotary kiln, a roto-sifter is installed, make the mud granule that meets the particle diameter requirement enter the 3rd group of anhydration system, thereby improve yield rate.
Concrete implementation step of the present invention is as follows:
1. be that the mud that 75～85% municipal sewage plants produce turns over mixed the evaporation with pollution river, lake dredging mud in the stacking field with water content, this process not only can make the mud spontaneous evaporation fall 1～5% of total water content, and can make the mud homogenizing from the different location.Turning over the time of mixing evaporation can decide according to the size and the weather condition of stacking the place, is generally 2～5 days;
2. for mud can fully be contacted with heat when first section mummification, improve the efficient of sludge drying, create conditions for the mud granulating simultaneously, to be 70～80% sludge from wastewater treatment plant and pollute the river through water content after turning over mixed evaporation, lake dredging mud passes through banded extruder, being made into diameter is the bar column of 0.6～1.0mm, and through Powder binding machine, with the mummification returned sluge of particle diameter less than 2mm, wrap up in powder for bar column mud, this is on the one hand for fear of the mutual bonding between the bar column mud, make bar column mud be broken into short cylinder on the other hand, for the mud granulating lays the first stone.Bar column mud is after wrapping up in powder and being broken into short cylinder, and (kiln body diameter is 1.8～2.0m, and length is 22.0～24.0m), carries out first section mummification, removes 20～30% of total water content to be admitted to temperature and to be 190～210 ℃ the first oven dry rotary kiln;
3. above-mentioned mud goes out the first oven dry rotary kiln, by cooling conveyor (hot mud be transmitted with the refrigerative process in can further dewater), (kiln body diameter is 1.6～1.8m to be admitted to temperature and to be 180～200 ℃ the second oven dry rotary kiln, length is 20.0～22.0m), carry out second section mummification, remove 20～25% of total water content;
4. above-mentioned mud goes out the second oven dry rotary kiln, by cooling conveyor (hot mud be transmitted with the refrigerative process in can further dewater again), through roto-sifter, to send the auxiliary fuel of heating stove greater than the mud granule of 4.5mm particle diameter as fire coal, mud granule less than the 2mm particle diameter, wherein 60～80% reflux, the powder of wrapping up in as bar column mud, 20～40% send the auxiliary fuel of heating stove as fire coal, with the mud granule of 2～4.5mm particle diameter send into temperature be 180～200 ℃ the 3rd the oven dry rotary kiln (kiln body diameter is 1.2～1.5m, length is 16.0～18.0m), carries out the 3rd section mummification, removes 15～20% of total water content;
5. after above-mentioned mud goes out the 3rd oven dry rotary kiln; because the contraction during mummification; mud granule greater than the 4mm particle diameter does not exist; pass through vibratory screening apparatus; mud granule less than the 2mm particle diameter refluxes; as the powder of wrapping up in of bar column mud, the mud granule of 2～4mm particle diameter becomes brickmaking mud, also can be used for other resources development and utilization.
Through the syllogic drying process, mud is obtaining effective mummification, natural granulating and hardening gradually in the scroll-up/down continuously, and is constantly being ground the garden along with the rotation of drying kiln.
Test-results of the present invention shows; organic substance in the mud begins destroyed greater than 250 ℃ the time; and play the flocculation agent of consolidation in the mud; greater than 200 ℃ the time, begin volatilization; therefore; in order to protect the organic substance in the mud not wreck; guarantee that simultaneously mud flocculation agent in natural granulating process can play consolidation; make the hardness of mud granule satisfy technical requirements; this invention is by being installed in heating stove (coal furnace; or gas furnace; or oil oven) and the injection thermosistor of oven dry between the rotary kiln, the heat that control provides sludge drying between 160～210 ℃, thereby guaranteed that original organic matter fraction more than 95% is not damaged in the mud; and can reach under the ideal degree in sludge drying efficient, the hardness of mud granule reaches the technical requirements of firing light energy saving brick.
Mud is in three sections drying process, flue dust that from fuel and mud, produces and obnoxious flavour, and the water vapour and the obnoxious flavour of cooling conveyor stripping from hot mud, send into the dedusting degasifying device with the tail gas vacuum fan and handle, discharge after reaching national atmospheric emission standard.For the obnoxious flavour that is difficult to remove that some mud produces,, send into heating stove high temperature and eliminate processing by reclaiming.
Fire light energy saving brick with the mud granule that the technology of the present invention produces, its ultimate compression strength reaches the requirement of top grade brick, and weight ratio is light by 8.5～10.1% with the common brick of volume, saves the energy about 10% of baking bricks.Table 5 has provided the performance test data of mud light cinder brick.
The The performance test results of table 5 mud light cinder brick
| Numbering | Mud add-on (%) | Sample number (piece) | Mean compressive strength (Mpa) | Minimum ultimate compression strength (Mpa) | Standard deviation (S) | The variation coefficient (δ) | Alleviate rate (%) than common brick | National standard (GB5101-85) |
| ??1 | ???15 | ???10 | ???15.6 | ????12.05 | ???2.21 | ???0.14 | ???10.14 | Five mean values of top grade common brick ultimate compression strength are not less than 14.72Mpa, and the monolithic minimum value is not less than 9.81 Mpa |
| ??2 | ???10 | ???10 | ???16.4 | ????11.4 | ???4.56 | ???0.28 | ???8.51 |
With the light cinder brick that the mud granule of the technology of the present invention generation is fired, process natural radiation property testing (Interventions Requested:
226Ra,
232Th,
40K) show that the natural radionuclides specific activity is respectively in the sample
226Ra＜50Bg/kg;
232Th＜60Bg/kg;
40K＜800Bg/kg; Mra＜1.0; Mr＜1.0.Through check (test basis GB11743-89), the mud light cinder brick meets " radiation protection standards for construction material " (GB6566-2000) middle category-A product requirement.
In addition, the mud granule that produces with the technology of the present invention can be saved 15～30% standard coal as the auxiliary fuel of sludge drying fire coal.
Claims (1)
1. the syllogic mummification of a brickmaking mud and granulating integral method, it is characterized in that: the step of method is as follows:
1) be that the mud that 75～85% municipal sewage plants produce turns over mixed the evaporation 2～5 days with pollution river, lake dredging mud in the stacking field with water content, 1～5% of total water content is fallen in spontaneous evaporation;
2) will to mix evaporation back water content be 70～80% sludge from wastewater treatment plant and pollute river, lake dredging mud through turning over, pass through banded extruder, being made into diameter is the bar column of 0.6～1.0mm, through wrapping up in powder, be admitted to temperature and be 190～210 ℃ the first oven dry rotary kiln, carry out first section mummification, remove 20～30% of total water content;
3) above-mentioned mud goes out the first oven dry rotary kiln, by cooling conveyor, is admitted to temperature and is 180～200 ℃ the second oven dry rotary kiln, carries out second section mummification, removes 20～25% of total water content;
4) above-mentioned mud goes out the second oven dry rotary kiln, pass through cooling conveyor, through roto-sifter, will send the auxiliary fuel of heating stove greater than the mud granule of 4.5mm particle diameter, less than the mud granule of 2mm particle diameter as fire coal, wherein 60～80% reflux, as the powder of wrapping up in of bar column mud, 20～40% send the auxiliary fuel of heating stove as fire coal, with the mud granule of 2～4.5mm particle diameter send into temperature be 160～200 ℃ the 3rd the oven dry rotary kiln, carry out the 3rd section mummification, remove 15～20% of total water content;
5) after above-mentioned mud goes out the 3rd oven dry rotary kiln, by vibratory screening apparatus, will reflux less than the mud granule of 2mm particle diameter, as the powder of wrapping up in of bar column mud, the mud granule of 2～4mm particle diameter gets final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410053840 CN1241851C (en) | 2004-08-16 | 2004-08-16 | Three stage type drying and granulating integrating method for brick-making sludge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410053840 CN1241851C (en) | 2004-08-16 | 2004-08-16 | Three stage type drying and granulating integrating method for brick-making sludge |
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| Publication Number | Publication Date |
|---|---|
| CN1587125A true CN1587125A (en) | 2005-03-02 |
| CN1241851C CN1241851C (en) | 2006-02-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410053840 Expired - Fee Related CN1241851C (en) | 2004-08-16 | 2004-08-16 | Three stage type drying and granulating integrating method for brick-making sludge |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100336752C (en) * | 2006-05-30 | 2007-09-12 | 浙江大学 | Circulation-type energy-saving sludge drying method |
| CN100429166C (en) * | 2006-04-04 | 2008-10-29 | 浙江大学 | Sludge drying system using combination of smoke residual heat and external heat supply source |
| CN100480202C (en) * | 2006-07-27 | 2009-04-22 | 浙江大学 | Control method for released gas in mud drying process |
| CN101823825A (en) * | 2010-05-27 | 2010-09-08 | 湖南科技大学 | Sludge dehydrating and drying process method and device |
| CN102381877A (en) * | 2011-05-16 | 2012-03-21 | 南京鑫翔新型建筑材料有限责任公司 | Method for brickmaking by comprehensive utilization of desiccated sludge |
| CN102491607A (en) * | 2011-11-23 | 2012-06-13 | 彭尹华 | Technology for producing sewage adsorbing stones by using sewage processing plant sludge |
| CN114262120A (en) * | 2021-12-20 | 2022-04-01 | 山东恒鑫生物科技有限公司 | Gelatin wastewater treatment process beneficial to environmental protection |
-
2004
- 2004-08-16 CN CN 200410053840 patent/CN1241851C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100429166C (en) * | 2006-04-04 | 2008-10-29 | 浙江大学 | Sludge drying system using combination of smoke residual heat and external heat supply source |
| CN100336752C (en) * | 2006-05-30 | 2007-09-12 | 浙江大学 | Circulation-type energy-saving sludge drying method |
| CN100480202C (en) * | 2006-07-27 | 2009-04-22 | 浙江大学 | Control method for released gas in mud drying process |
| CN101823825A (en) * | 2010-05-27 | 2010-09-08 | 湖南科技大学 | Sludge dehydrating and drying process method and device |
| CN102381877A (en) * | 2011-05-16 | 2012-03-21 | 南京鑫翔新型建筑材料有限责任公司 | Method for brickmaking by comprehensive utilization of desiccated sludge |
| CN102381877B (en) * | 2011-05-16 | 2013-06-12 | 南京鑫翔新型建筑材料有限责任公司 | Method for brickmaking by comprehensive utilization of desiccated sludge |
| CN102491607A (en) * | 2011-11-23 | 2012-06-13 | 彭尹华 | Technology for producing sewage adsorbing stones by using sewage processing plant sludge |
| CN114262120A (en) * | 2021-12-20 | 2022-04-01 | 山东恒鑫生物科技有限公司 | Gelatin wastewater treatment process beneficial to environmental protection |
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|---|---|
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