CN101298382A - Processing and reusing method of city sludge - Google Patents
Processing and reusing method of city sludge Download PDFInfo
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- CN101298382A CN101298382A CNA2008100679784A CN200810067978A CN101298382A CN 101298382 A CN101298382 A CN 101298382A CN A2008100679784 A CNA2008100679784 A CN A2008100679784A CN 200810067978 A CN200810067978 A CN 200810067978A CN 101298382 A CN101298382 A CN 101298382A
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
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Abstract
The invention relates to a municipal sludge treatment and re-utilization method, which comprising the following steps of: adding quicklime powder into the municipal sludge to make physical and chemical treatment, and carrying out sterilization, deodorization and dehydration treatment on the sludge, then the sludge is mixed with ocean dredged mud according to certain ratio, and the mixture is used as the raw material for producing sea mud-sludge compound ceramic particles. When other auxiliary materials are added into the raw material of the sea mud-sludge compound ceramic particles, high-quality lightweight ceramic particle can be obtained after the sintering process. The invention can effectively treat the municipal sludge and ocean dredged mud, solve the environmental pollution problem; at the same time, the resource utilization of the waste is realized, which saves the resource and meets the concepts for developing environmental protection industry and the recycled economy.
Description
Technical field
The invention belongs to green technology, the processing that is specifically related to a kind of municipal sludge utilizes method again.
Background technology
Municipal sludge is the sedimentable matter that the municipal sewage plant produces in the process of disposing of sewage.Municipal sludge water ratio height (70～80%), perishable, strong odor is arranged, and contain poisonous, harmful carcinogens that heavy metal such as a large amount of pathogenic bacterias, parasitic ovum and chromium, mercury and polychlorobiphenyl, Dioxins etc. are difficult to degrade.If unprocessed random discharging, mud very easily causes secondary pollution to underground water, soil etc. through the erosion and the seepage of rainwater, and directly harm humans is healthy.For a long time, the sludge treatment of China is disposed all comparatively simple, and particularly at some urban wastewater treatment firms, perhaps directly throw aside in the normal unprocessed farmland that just is transported to of biochemical sludge.
The at present external city Sludge Disposal Techniques that extensively adopts can reduce three major types, and referring to table 1: 1. clay treatment comprises that mud is agricultural and is applied to forest or gardening; 2. separately or with common landfill such as domestic refuse; 3. thermal treatment.
Domestic most of sludge of sewage treatment plants is disposed based on the outward transport landfill, and treatment process mainly contains: 1, directly outward transport of dewatered sludge (about water ratio 70%～80%); 2, the stable back of digestion processed is transported outward again; 3, direct deodorization by incineration sewage sludge; 4, the mud after the mummification uses as farming is fertile.The economic comparison sheet that mud is carried out sanitary landfill, burning electricity generation and composting technology sees Table 2.
| Mud | The U.S. | Japan | Denmark | Britain | Belgium | Italy | Germany | Switzerland | Holland | Spain | Austria | Luxembourg | Ireland | Portugal | Greece | France | Sweden | Mean value |
| Landfill % | 21 | 35 | 29 | 16 | 43 | 55 | 65 | 30 | 29 | 10 | 35 | 20 | 34 | 12 | 90 | 53 | 40 | 36.3 |
| Burn % | 3 | 55 | 28 | 5 | 11 | 10 | 20 | 10 | 37 | 20 | 11.7 | |||||||
| Agricultural % | 45 | 9 | 43 | 51 | 57 | 34 | 25 | 50 | 53 | 61 | 28 | 80 | 23 | 80 | 10 | 27 | 60 | 43.3 |
| Ocean % | 30 | 28 | 8 | 29 | 43 | 8 | 8.6 |
Table 1
| Item compared | Sanitary landfill | Burn | Compost |
| Engineering reliability | Reliably, belong to treatment process commonly used | More reliable, belong to mature technology abroad | More reliable, there is practical experience in China |
| Project scale | Scale depends primarily on operation place, landfill storage capacity, equipment configuration and working life, and is generally all bigger | Separate unit incinerator specification is used 100～500t/d always, and garbage burning factory is generally installed 2～4 incinerators | Static state or dynamic intermittent formula composting plant are used 100～200t/d always, and dynamically the continous way composting plant can reach 200～400t/d, |
| Ton investment (disregarding fees paid for taking rural land) | 18～270,000 yuan/t (individual layer synthesizes substrate, and compactor is introduced) | 50～700,000 yuan/t (cogeneration online, the localization rate of parts and components 50%) | 25～360,000 yuan/t (being shaped on machine composite fertilizer, the localization rate of parts and components 60%) |
| Processing cost (disregarding depreciation and freight charges) | 26～35 yuan/t | 50～80 yuan/t | 35～50 yuan/t |
| Processing cost (freight charges are disregarded in the meter depreciation) | 35～55 yuan/t | 90～200 yuan/t | 50～80 yuan/t |
Table 2
The shortcoming that above-mentioned treatment process exists separately is as follows: 1, the method for the direct outward transport of dewatered sludge (about water ratio 70%～80%) because water ratio is too high, causes the landfill yard operational difficulty, and also can take landfill yard storage capacity in a large number; Some is to topple over everywhere, causes secondary pollution; Also some directly applies the farmland as agricultural fertilizer, because directly the mud of dehydration wherein contains a large amount of pathogenic bacterias without pyroprocessing.2, the method transported outward again of the stable back of digestion processed because mud has been killed most pathogenic bacterias through digestion process, and can also produce biogas for produce, the life use, accomplished innoxiously substantially, and certain resource utilization meaning is arranged also.But this technology remains unsolved and disposes the problem of high-moisture percentage dewatered sludge.3, the method for direct deodorization by incineration sewage sludge, major cause is that equipment is immature, the operational management difficulty is big, needs to add a large amount of auxiliary fuels, running cost height.4, the mud after the mummification uses as farming is fertile, adopts thermal technology's method drying and dewatering mud, adopts in some sewage work, running condition still can, because drying process needs a large amount of heats that use, and has than higher running cost, can not effectively handle for the heavy metal in the mud.
Except above-mentioned treatment process, existing both at home and abroad technology and the patent applied for that is used to prepare haydite, ceramic after mud is handled, for example: " method of preparing haydite by sintering urban domestic sewage sludge " of Tsing-Hua University, publication number is CN101148348; " light ceramsite prepared by ocean dredged sludge and the production method thereof " of South Sea Ocean Engineering Investigation ﹠ Environment Research Academy, State, publication number is CN1844033; " a kind of method " of Shandong University with preparing haydite from urban sewage plant sludge, publication number is CN101148346; " a kind of method for preparing light ceramic with water supply plant and sewage plant sludge " of Nankai University, publication number is CN1644565; " using biosolid waste to produce the method for ceramic " (the METHOD OFPRODUCING CERAMIC PRODUCTS UTILIZING SLUDGE WASTE FROM WATERSUPPLY) of KAJIMACORP etc., Japanese Patent No. JP2002047054; Or the like.
The ocean dredging thing is the waste that produces in a kind of port construction engineering and the waterway dredging engineering, and it mainly is made up of dredging mud, the husky and a small amount of stone of dredging.Present ocean dredging owner will transport the Dredged Material Dumping at Sea district to and topple over disposal, this method Marine Pollution, and the destruction of causing Marine ecosystems, and need to pay the expensive trucking costs of toppling over.
Along with improving constantly of treatment rate of domestic sewage, sludge of sewage treatment plant output constantly increases, and how preferably sludge of sewage treatment plants effectively to be handled, and prevents that the generation of secondary pollution from becoming more and more distinct issues.Follow the development of harbour and waterway construction simultaneously, the ocean dredging thing of generation also becomes an important source of environmental pollution day by day.
Summary of the invention
The object of the present invention is to provide a kind of can the processing municipal sludge and ocean dredging thing effectively, realized that simultaneously the processing of the municipal sludge that the resource utilization of these two kinds of wastes is utilized again utilizes method again.
The present invention includes following steps:
(1) add calcium lime powder and stirring in the municipal sludge, the add-on of calcium lime powder is 10～20% of a municipal sludge weight, municipal sludge and calcium lime powder reaction 4～24 hours, materialization processing mud;
(2) with water ratio be 30～40% materialization handle mud and water ratio be the prepared by ocean dredged sludge of 25-30% by 1: the part by weight of (1～2) mixes also and stirs, ooze mud composite haydite raw material.
Municipal sludge becomes materialization and handles mud after (1) step process, its water ratio is reduced to about 30-60%, and water ratio is decided on the add-on and the stirring technique of calcium lime powder, and the stable performance of mud is handled in materialization, can not produce stench.If it is higher that the water ratio of mud is handled in materialization, promptly surpass 40%, can adopt the nature dehydration for example to bank up 7-15 days or the method for mechanical dehydration makes its water ratio be reduced to 30%～40%, can not produce secondary pollution.
The present invention was generally 5～10 minutes in the churning time in (1) step, can adopt rotary speed mixer or double-shaft spiral stirrer to stir, adopt rotary speed mixer, the churning time of material was generally 8～10 minutes, adopt the double-shaft spiral stirrer, material churning time be generally 5～10 minutes.The present invention was generally 5～10 minutes in (2) step churning time, can adopt the double-shaft spiral stirrer to stir.
Mud is handled in the present invention's materialization in (2) step, and to adopt water ratio be that mud is handled in 30% materialization, and it is that 30% prepared by ocean dredged sludge is better that prepared by ocean dredged sludge adopts water ratio.
The preferred 250-300 of the activity index of unslaked lime among the present invention.
Principle of work of the present invention is as follows: municipal sludge water ratio height, mainly form by the microbial bacteria micelle, be paste, water wherein mainly exists with three kinds of forms, i.e. free state water, physical property combination water (for example capillary water, interstitial water, colloid surface planar water) and chemical combination water (for example water in molecular water, the cell).Free state water can be removed by gravity or machinery, and physical property combination water and chemical combination water need by heat and break chemical bond and remove.Present method is to add calcium lime powder (CaO) in municipal sludge, and hydration reaction (CaO+H takes place for free state water and physical property combination water in the unslaked lime absorption mud
2O=Ca (OH)
2+ heat), emit heat, destroy the micelle structure of mud, mud is desertified, and part moisture in the evaporation mud, the water ratio of reduction mud.Unslaked lime aquation reaction back forms the high alkalinity solution environmental in mud, the intracellular moisture of microbial bacteria micelle is oozed out, intracellular chemical combination water is transformed into free state water, and microorganism is dead in alkaline environment, thereby reaches sterilization, deodorizing, the dehydrating effect of mud.Through the municipal sludge after the above-mentioned processing, water ratio can be reduced to 30%, volume is reduced to original about 1/3, no longer produce stench, organic class material wherein, heavy oil component during alternative haydite is produced, be used to produce the whipping agent and the auxiliary fuel of haydite, reduce the haydite firing temperature, the haydite pore that it burns till is even, functional.The ocean dredging composition granule is trickle, the silicon content height, viscosity is good, alternative land clay baking ceramsite, it burns till, and haydite unit weight is light, intensity is high, and performance is better than the land leca, and the haydite unit weight that it burns till is 300kg/m3, intensity is 0.8Mpa, meets the requirement of high-quality haydite in the GB/T17431.1-1998 standard.The present invention handles mud and the mixed by a certain percentage ooze mud composite haydite raw material that gets of prepared by ocean dredged sludge with materialization, and it combines the high-performance that mud and prepared by ocean dredged sludge baking ceramsite are handled in materialization, can be directly used in haydite factory batching and produce.
Technique effect of the present invention is:
1, the present invention has effectively realized the harmless treatment of municipal sludge, has avoided environment is produced secondary pollution;
2, the present invention realizes the harmless treatment of ocean dredging thing and utilizes, has reduced the destruction to ocean environment;
3, the present invention has realized the recycling of two kinds of wastes, has saved the consumption of land resources, has reduced the destruction to land resources.
4, comparing of the present invention and existing sludge treatment technology, processing costs is lower, and investment more economizes.
In a word, the present invention can effectively handle municipal sludge and ocean dredging thing, has solved environmental pollution problems, has realized the recycling of waste simultaneously, has saved resource, meets the theory of development environmental protection industry and recycling economy.
Embodiment
Embodiment one:
The municipal sludge mud cake is transported between mud materialization Wagon for medical treatment through the closed canning cart, municipal sludge is poured in the mud hopper, open mud hopper bottom valve, regulate mud discharge, mud is entered in the rotary speed mixer continuously, and mud enters 10 tons of total amounts, and calcium lime powder measures to be delivered to continuously in the rotary speed mixer from the unslaked lime storage tank through the spiral measuring apparatus and mixes with municipal sludge simultaneously, the activity index of calcium lime powder is 250, and entering total amount is 2 tons.Stirrer continuously stirring 5 hours.The concurrent unboiled water reaction that stirs in stirrer of municipal sludge and calcium lime powder produces about 100 ℃ temperature, part moisture and mud carried out sterilization, deodorizing, dehydration in the evaporation mud.The moisture percentage in sewage sludge that comes out in the stirrer is reduced to 40%, and stable performance can not produce stench.
The above-mentioned materialization of handling through physico-chemical process handled 5 tons in mud and be 5 tons of 30% oozes through water ratio after the airing, enter continuously in the double-shaft spiral mixer and stirred 2 hours, stir, the material that stirs is ooze mud composite haydite raw material, being transported to the haydite materials stockyard through belt conveyor banks up, ooze mud composite haydite raw material after banking up is loaded on the carrier vehicle with shovel loader, deliver to haydite factory, ooze mud composite haydite raw material adds the auxiliary material that other haydite is produced, and can burn out the light ceramic of excellent property.
Embodiment two:
The municipal sludge mud cake is transported between mud materialization Wagon for medical treatment through the closed canning cart, municipal sludge is poured in the mud hopper, open mud hopper bottom valve, regulate mud discharge, mud is entered in the closed double-shaft spiral stirrer continuously, enter 10 tons of total amounts, calcium lime powder measures to be delivered to continuously in the stirrer from the unslaked lime storage tank through the spiral measuring apparatus and mixes with municipal sludge simultaneously, the activity index of calcium lime powder is 300,1 ton of add-on, stirrer stirred 2 hours, the concurrent unboiled water reaction that in stirrer, stirs of municipal sludge and calcium lime powder, produce about 50 ℃ temperature, part moisture and mud carried out sterilization in the evaporation mud, deodorizing, dehydration.The moisture percentage in sewage sludge that comes out in the stirrer is reduced to 60%.Its water ratio of 7-15 angel of banking up is reduced to 40%.
With above-mentioned water ratio is that 40% materialization is handled 5 tons in mud and is 10 tons of 25% oozes through water ratio after the airing, puts into the double-shaft spiral mixer continuously and stirs 3 hours, stirs, and the material that stirs is ooze mud composite haydite raw material.
Embodiment three:
The municipal sludge mud cake is transported between mud materialization Wagon for medical treatment through the closed canning cart, municipal sludge is poured in the mud hopper, open mud hopper bottom valve, regulate mud discharge, mud is entered in the closed double-shaft spiral stirrer continuously, enter 10 tons of total amounts, calcium lime powder measures to be delivered to continuously in the stirrer from the unslaked lime storage tank through the spiral measuring apparatus and mixes with municipal sludge simultaneously, the activity index of calcium lime powder is 300,1 ton of add-on, stirrer stirred 2 hours, the concurrent unboiled water reaction that in stirrer, stirs of municipal sludge and calcium lime powder, produce about 50 ℃ temperature, part moisture and mud carried out sterilization in the evaporation mud, deodorizing, dehydration.The moisture percentage in sewage sludge that comes out in the stirrer is reduced to 60%.Its water ratio of 7-15 angel of banking up is reduced to 40%.
With above-mentioned water ratio be 40% materialization handle 5 tons in mud, through 3 tons in water ratio after the airing is 25% 10 tons of oozes, iron-holder is 15-20% iron ore mud; enter continuously in the double-shaft spiral mixer and stirred 4 hours; stir; the material that stirs enters the Squeezinggranulator granulation, enters haydite rotary kiln high-temperature firing again.The haydite unit weight that burns out is 290kg/m
3, cylindrical compress strength is 0.6Mpa, meets the technical requirements of 300kg level high-quality haydite in the GB/T17431.1-1998 standard.
Claims (9)
1. the processing of a municipal sludge utilizes method again, it is characterized in that comprising the steps:
(1) add calcium lime powder and stirring in the municipal sludge, the add-on of calcium lime powder is 10～20% of a municipal sludge weight, municipal sludge and calcium lime powder reaction 4～24 hours, materialization processing mud;
(2) with water ratio be 30～40% materialization handle mud and water ratio be the prepared by ocean dredged sludge of 25-30% by 1: the part by weight of (1～2) mixes also and stirs, ooze mud composite haydite raw material.
2. the processing of municipal sludge according to claim 1 utilizes method again, it is characterized in that:, then adopt the method for nature dehydration or mechanical dehydration to make its water ratio reduce to 30%～40% if the water ratio that mud is handled in described (1) step gained materialization surpasses 40%.
3. the processing of municipal sludge according to claim 2 utilizes method again, it is characterized in that: with materialization handle mud bank up the 7-15 angel its dewater naturally.
4. the processing according to claim 1 or 2 or 3 described municipal sludges utilizes method again, it is characterized in that: materialization processing mud employing water ratio is 30% materialization processing mud in described (2) step, and prepared by ocean dredged sludge employing water ratio is 30% prepared by ocean dredged sludge.
5. the processing according to claim 1 or 2 or 3 described municipal sludges utilizes method again, it is characterized in that: it is the unslaked lime of 250-300 that described unslaked lime adopts activity index.
6. the processing according to claim 1 or 2 or 3 described municipal sludges utilizes method again, it is characterized in that: described (1) step adopts rotary speed mixer or double-shaft spiral stirrer to stir.
7. the processing according to claim 1 or 2 or 3 described municipal sludges utilizes method again, it is characterized in that: described (2) step adopts the double-shaft spiral stirrer to stir.
8. the processing according to claim 1 or 2 or 3 described municipal sludges utilizes method again, it is characterized in that: the churning time in described (1) step is 5-10 minute.
9. the processing according to claim 1 or 2 or 3 described municipal sludges utilizes method again, it is characterized in that: the churning time in described (2) step is 5-10 minute.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100679784A CN101298382A (en) | 2008-06-23 | 2008-06-23 | Processing and reusing method of city sludge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100679784A CN101298382A (en) | 2008-06-23 | 2008-06-23 | Processing and reusing method of city sludge |
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| CN101298382A true CN101298382A (en) | 2008-11-05 |
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| CNA2008100679784A Pending CN101298382A (en) | 2008-06-23 | 2008-06-23 | Processing and reusing method of city sludge |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805169A (en) * | 2010-04-22 | 2010-08-18 | 北京四方如钢混凝土制品有限公司 | Sludge treatment method and sintered sludge ceramsites produced by same |
| CN102320854A (en) * | 2011-06-03 | 2012-01-18 | 王深 | Sludge treatment and recycling method of urban sewage treatment plant |
| CN107188383A (en) * | 2017-06-17 | 2017-09-22 | 常州环际商贸有限公司 | A kind of preparation method of Sludge deodorant |
| CN109516658A (en) * | 2018-11-30 | 2019-03-26 | 清华大学 | A kind of processing method of bed mud |
| CN111068535A (en) * | 2019-12-11 | 2020-04-28 | 湖南信提环保装备技术咨询有限公司 | Drying recycling method for purified slag of modified asphalt spraying sewage |
-
2008
- 2008-06-23 CN CNA2008100679784A patent/CN101298382A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101805169A (en) * | 2010-04-22 | 2010-08-18 | 北京四方如钢混凝土制品有限公司 | Sludge treatment method and sintered sludge ceramsites produced by same |
| CN102320854A (en) * | 2011-06-03 | 2012-01-18 | 王深 | Sludge treatment and recycling method of urban sewage treatment plant |
| CN102320854B (en) * | 2011-06-03 | 2013-03-27 | 王深 | Sludge treatment and recycling method of urban sewage treatment plant |
| CN107188383A (en) * | 2017-06-17 | 2017-09-22 | 常州环际商贸有限公司 | A kind of preparation method of Sludge deodorant |
| CN107188383B (en) * | 2017-06-17 | 2019-08-06 | 上海启菲特环保生物技术有限公司 | A kind of preparation method of Sludge deodorant |
| CN109516658A (en) * | 2018-11-30 | 2019-03-26 | 清华大学 | A kind of processing method of bed mud |
| CN111068535A (en) * | 2019-12-11 | 2020-04-28 | 湖南信提环保装备技术咨询有限公司 | Drying recycling method for purified slag of modified asphalt spraying sewage |
| CN111068535B (en) * | 2019-12-11 | 2022-11-11 | 湖南信提环保装备技术咨询有限公司 | Drying recycling method for purified slag of modified asphalt spraying sewage |
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Open date: 20081105 |