CN101186423A - Heat treatment-dehydration-fertilizer making method for town sewage and sludge - Google Patents
Heat treatment-dehydration-fertilizer making method for town sewage and sludge Download PDFInfo
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- CN101186423A CN101186423A CNA2007103020149A CN200710302014A CN101186423A CN 101186423 A CN101186423 A CN 101186423A CN A2007103020149 A CNA2007103020149 A CN A2007103020149A CN 200710302014 A CN200710302014 A CN 200710302014A CN 101186423 A CN101186423 A CN 101186423A
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- 239000010802 sludge Substances 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000010865 sewage Substances 0.000 title claims abstract description 21
- 239000003337 fertilizer Substances 0.000 title claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 claims abstract description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 24
- 239000004021 humic acid Substances 0.000 claims abstract description 24
- 230000018044 dehydration Effects 0.000 claims abstract description 16
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 16
- 239000000654 additive Substances 0.000 claims abstract description 8
- 230000000996 additive effect Effects 0.000 claims abstract description 7
- 238000001471 micro-filtration Methods 0.000 claims abstract description 6
- 238000009287 sand filtration Methods 0.000 claims abstract description 5
- 206010021143 Hypoxia Diseases 0.000 claims abstract description 3
- 238000009264 composting Methods 0.000 claims description 11
- 238000000108 ultra-filtration Methods 0.000 claims description 10
- 239000012528 membrane Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 239000011591 potassium Substances 0.000 claims description 3
- 229910052700 potassium Inorganic materials 0.000 claims description 3
- 239000006004 Quartz sand Substances 0.000 claims description 2
- 208000018875 hypoxemia Diseases 0.000 claims description 2
- 230000008676 import Effects 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 238000003756 stirring Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 12
- 239000007787 solid Substances 0.000 abstract description 8
- 238000001914 filtration Methods 0.000 abstract description 4
- 239000002910 solid waste Substances 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000001146 hypoxic effect Effects 0.000 abstract 1
- 230000003340 mental effect Effects 0.000 abstract 1
- 244000052769 pathogen Species 0.000 abstract 1
- 230000001717 pathogenic effect Effects 0.000 abstract 1
- 238000007669 thermal treatment Methods 0.000 description 10
- 229910001385 heavy metal Inorganic materials 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000010808 liquid waste Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 229910052785 arsenic Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 239000002361 compost Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910052745 lead Inorganic materials 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 150000003384 small molecules Chemical class 0.000 description 2
- WZLMXYBCAZZIRQ-UHFFFAOYSA-N [N].[P].[K] Chemical compound [N].[P].[K] WZLMXYBCAZZIRQ-UHFFFAOYSA-N 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 150000004676 glycans Chemical class 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 102000039446 nucleic acids Human genes 0.000 description 1
- 108020004707 nucleic acids Proteins 0.000 description 1
- 150000007523 nucleic acids Chemical class 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 239000005017 polysaccharide Substances 0.000 description 1
- 102000004169 proteins and genes Human genes 0.000 description 1
- 108090000623 proteins and genes Proteins 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
Images
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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
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
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- Treatment Of Sludge (AREA)
- Fertilizers (AREA)
Abstract
A heat treatment-dehydration-making fertilizer method of urban sewage and sludge is provided, which pertains to the treatment filed of solid waste. Sodium hydroxide is added into dewatered sludge and stirred, hypoxic steam with temperature and pressure more than 250 DEG C and 4MPa is input, the temperature is raised to 120-140 DEG C for 40-100 min; the temperature is reduced to less than 100 DEG C, dehydrated liquid and dehydrated sludge cake with amount decreased are obtained after dehydration; the dehydrated liquid is treated by sand filtration and microfiltration, then whole filtration is carried out and the concentrated solution with humic acid more than 3wt percent is obtained; the humic acid liquid fertilizer is obtained after the concentrated solution is added with additive. The invention can greatly reduce the expenses of sludge heat treatment; water content of the obtained dehydrated sludge cake is less than 60 percent and the total solid reduces by 35 percent; the heavy mental content of the obtained humic acid liquid fertilizer is low, the pH value keeps in the range of weak alkaline and the pathogen is inactivated; the method is safe and efficient, complies with Fertilizer Application Guideline of National Ministry of Agriculture and can be widely applied to harmless, quantitative reduction and resource utilization treatment of urban sewage and sludge.
Description
Technical field
The present invention relates to that treatment of town sewage and sludge after heat treatment dewaters, a kind of method of composting, belong to the solid waste process field.
Background technology
The most of city domestic sewages of China adopt activated sludge process to handle, the a large amount of excess sludge of annual generation, by 30,000,000,000 tons of sanitary sewage quantity dischargeds in 2006, processing rate 40%, mud (water ratio 99%) generation is 1% of a sewage load, then produce about 1.2 hundred million tons of excess sludge, convert to dehydrated sludge cake (water ratio 80%) and be about 6,000,000 tons.Along with the increase of China's city domestic sewage quantity discharged and the raising of processing rate, the mud generation also will constantly increase.Dehydrated sludge cake not only generation is big, and water ratio and organic content are very high, is difficult to satisfy the requirement that follow-up landfill, compost, burning etc. are handled, and has brought a difficult problem also for the conveying of mud and secondary pollution control.
In order to reduce the dehydrated sludge cake water ratio, can before sludge dewatering, introduce pretreatment process, improve the degree of dehydration of mud.The most frequently used pretreatment process is thermal treatment, at first excess sludge is heated to 135～165 ℃ of (low-temperature heat treatment methods, need oxygenation) or 180～220 ℃ (high-temperature heat treatment method), utilize heat effect to destroy the mud colloidal structure, discharge combination water, make the cohesion of part flco, directly dewater after the processing, moisture content of the cake can reach below 60%.(water ratio was reduced to 60% o'clock from 80% because the decline of moisture percentage in sewage sludge and the removal amount of actual moisture are also disproportionate, moisture promptly removes 63%), therefore the tupe of thermal treatment+dehydration can effectively reduce the expense that the mud subsequent disposal is disposed, and the dehydrated sludge cake of water ratio 60% also can directly carry out landfill or compost, satisfies the technical requirements of subsequent disposal.
Though the development of many decades has been passed through in thermal treatment, technology is constantly improved, and itself some problem of inherent has restricted its widespread use in the sludge dewatering field.On the one hand, no matter be high-temperature heat treatment, or low-temperature heat treatment, all needing under high pressure the large quantity of moisture in the excess sludge (water ratio is more than 95%) to be heated to relevant temperature, energy expenditure is very big, and processing costs is very high.On the other hand, mud thermal treatment also can produce the liquid of deviating from of high density, because the most of organism in the mud is dissolved, it is dense to deviate from liquid BOD, COD, can increase the load of Waste Water Treatment, and deviate from liquid and contain and be difficult for biodegradable humic acid material in a large number, being dark brown, conventional biological treatment process is difficult to satisfy the requirement of deviating from the liquid decolouring.The humic acid of deviating from the liquid derives from two portions, a part is the humic acid that itself contains in the mud, organic content generally accounts for dried solid more than 60% in the mud, wherein based on larger molecular organicses such as protein (about 46-52%), humic acid (about 18-23%), polysaccharide (about 7%), nucleic acid and fat; Another part is that the mud organic matter forms in heat treatment process, when larger molecular organics is decomposed into small organic molecule, also has the polymerization of part small molecules to generate humic acid organic substances.
Summary of the invention
The present invention is directed to the problem that the existing heat treatment technics of mud exists, proposed a kind of new mud heat treating method, one side as heat treatment object, significantly reduces the required energy consumption of sludge water content heating with dehydrated sludge cake; The humic acid that utilizes membrane separation technique to extract in the liquid is on the other hand produced liquid fertilizer, solves the processing difficult problem that high density is deviate from liquid.This method can realize the reinforcement dehydration and the composting utilization of mud synchronously.
Thermal treatment-the dehydration of treatment of town sewage and sludge-composting method, this method may further comprise the steps:
(1) NaOH of adding 0.08～0.16wt% in dehydrated sludge cake (water ratio 80%) to reduce thermal treatment temp, promotes the stripping of humic acid in the mud and the precipitation of heavy metal;
(2) this mud be transported in the horizontal spiral thermal treater stir, import simultaneously high pressure steam (250 ℃, more than the 4MPa, anaerobic or hypoxemia), mud is heated to 120～140 ℃, the residence time 40～100min, mud is effectively cracked, and organic stripping enters liquid phase;
(3) reacted mud enters water cooler, is cooled to below 100 ℃ (to prevent mud decompression back vaporization, take away heat);
(4) cooled mud enters water extracter dehydration, obtains the dehydrated sludge cake after the decrement;
(5) deviate from liquid through sand filtration (1～2mm quartz sand) and micro-filtration (alkaline-resisting mineral membrane, aperture 0.1～1 μ m, mould difference 0.3MPa) handles, remove suspended particle, filter entirely then, carry out ultrafiltration and concentration after promptly adding water, always add 3～5 times in water, adopt the inorganic ultra-filtration membrane of molecular weight cut-off 2500, working pressure 0.5MPa, 3～6 times of total cycles of concentration obtain to contain the above concentrated solution of humic acid 3wt%.
(6) concentrated solution is a humic acid stoste, can be made into different types of humic acid liquid fertilizer after adding different additives.
Described additive is nitrogen, phosphorus, potassium (deciding on primary sludge character).
(7) liquid that sees through that ultrafiltration produces adopts conventional activated sludge process to handle or be back to the sewage treatment plant inflow end.
The present invention has the following advantages:
(1) with the dehydrated sludge cake is process object, adapts to the present situation that the most of cities of China focus on dehydrated sludge cake.
(2) compare with existing mud heat treatment technics, the present invention has realized the recycling of mud.Because heavy metal mainly remains in the dehydrated sludge cake with precipitation forms under the alkaline condition, the heavy metal content of deviating from the liquid is few, deviate from liquid again through heavy metal there not being the ultrafiltration membrane treatment of the effect held back, heavy metal content is extremely low in the humic acid concentrated solution that finally obtains, and the pH value remains on the weakly alkaline scope, meet the national Ministry of Agriculture " fertilizer usage criteria ", can satisfy general humic acid liquid fertilizer standard (as " the containing humic acid dissolved fertilizer standard DB240-2003 " of Hubei Province Department of Agriculture promulgation) behind the interpolation nitrogen phosphorus potassium additive.
(3) compare with existing mud heat treatment technics, the present invention can significantly reduce the heat treated expense of mud.For water ratio is that 98% thickened sludge and water ratio are for 80% the dehydrated sludge cake, and when their contained dried solid masses were identical, the moisture among the former was more than 12 times of the latter, was that process object can reduce the thermal treatment energy consumption with the dehydrated sludge cake therefore.Add small amount of N aOH in the dehydrated sludge cake, can reduce thermal treatment temp, and not need aerating oxygen.Deviate from liquid behind larger molecular organicses such as extraction humic acid, only contain the small organic molecule of readily biodegradable, the long-time aeration that needn't adopt is handled, and the liquid waste disposal time obviously shortens, and processing costs obviously reduces.
(4) the present invention has tangible mud decrement effect.Present method not only can make the dehydrated sludge cake water ratio be reduced to 40～60%, and total solids is reduced more than 35%, so total mass compares former dehydrated sludge cake and reduce more than 65%, and this can significantly reduce the mummification of mud subsequent thermal and other treatment and disposal expense.The present invention is innoxious at treatment of town sewage and sludge, have more by force in the processing of minimizing, resource utilization and use.
Description of drawings
Fig. 1 is the schematic flow sheet of the inventive method.
Embodiment
Further specify the present invention below in conjunction with embodiment.
Fig. 1 is the schematic flow sheet of the inventive method.The processing unit that the inventive method adopts can be divided into three processing units: thermal treatment unit, dewatering unit and liquid waste disposal unit, and each unitary equipment and technological process are respectively described below:
(1) thermal treatment unit: this unit main body is horizontal spiral thermal reactor and water cooler.
NaOH with common dehydrated sludge cake adding 0.08～0.16wt% sends into thermal reactor through spiral pump, and the mud temperature is increased to 120～140 ℃ under the high pressure steam effect, reaction times 40～100min.Under this temperature condition, mud granule disintegrates, and cell rupture, cell organic matter discharge.Reacted mud enters dewatering unit after the water cooler cooling.
High pressure steam also can utilize near thermal source (as power plant) to provide, or the dehydrated sludge cake (Lower heat value is higher than self-supporting incendiary lower limit 3500KJ/kg) that is produced by dewatering unit provides in the burning boiler internal combustion.
(2) dewatering unit: this unit main body is a water extracter.
Dewatering performance of sludge after the thermal treatment is good, enters dewatering unit and can dewater under the condition that does not add flocculation agent to water ratio and be lower than 60%.
(3) liquid waste disposal unit: this unit main body is sand filter, micro-filtration and ultrafiltration apparatus.
The liquid (waste liquid) of deviating from that sludge dewatering produces is at first removed fine particle through sand filtration and micro-filtration, the full filtration purification of utilization concentrates the larger molecular organicses such as humic acid in the liquid again, in concentrated solution, add proper N, phosphorus, potassium additive (deciding), make liquid fertilizer on primary sludge character; Ultrafiltration produces sees through the small-molecule substance that liquid only contains readily biodegradable, can adopt conventional activated sludge process to handle, and also can be back to sewage work's front end.
Embodiment 1:
The dehydrated sludge cake water ratio that certain urban wastewater treatment firm produces is 81%, and organic content is 74% in the dried solid.
In dehydrated sludge cake, add the sodium hydroxide of 0.16wt%, utilize spiral pump that it is delivered in the horizontal spiral thermal treater then, and the feeding high pressure steam (250 ℃, 4MPa) be heated to 140 ℃, the residence time is 40min; Sludge reaction is laggard goes into water cooler, carries out mechanical dehydration after the cooling.Reaction result, before handling, dried solid masses reduces 40%, dehydrated sludge cake water ratio 47%; Chemical oxygen demand (COD) in the waste liquid (COD) is 103.0g/L, and content of humic acid is 31.0g/L, and content of humic acid is 3.1wt% after full filtration is purified, heavy metal content Cd≤0.01wt%, As≤0.002wt%, Pb≤0.002wt% meets the national Ministry of Agriculture " fertilizer usage criteria "; It is transparent, colourless that ultrafiltration sees through liquid, can be back to sewage work's front end.
Embodiment 2:
The dehydrated sludge cake water ratio that certain urban wastewater treatment firm produces is 80%, and organic content is 61% in the dried solid.
In dehydrated sludge cake, add the sodium hydroxide of 0.08wt%, utilize spiral pump that it is delivered in the horizontal spiral thermal treater then, and the feeding high pressure steam (250 ℃, 4MPa) be heated to 120 ℃, the residence time is 100min; Sludge reaction is laggard goes into water cooler, carries out mechanical dehydration after the cooling.Reaction result, before handling, dried solid masses reduces 35%, dehydrated sludge cake water ratio 56%; COD is 99.7g/L in the waste liquid, and content of humic acid is 22.2g/L, and content of humic acid is 4.4wt% after full filtration purification concentrates 2 times, heavy metal content Cd≤0.01wt%, As≤0.002wt%, Pb≤0.002wt% meets the national Ministry of Agriculture " fertilizer usage criteria "; It is transparent, colourless that ultrafiltration sees through liquid, can be back to sewage work's front end.
Claims (7)
1. thermal treatment-the dehydration of treatment of town sewage and sludge-composting method at dewatered sludge, is characterized in that, this method may further comprise the steps:
(1) in dewatered sludge, adds sodium hydroxide;
(2) step (1) is added the mud that sodium hydroxide obtains and stir, import simultaneously that 250 ℃, 4MPa are above, anaerobic or hypoxemia steam, mud is heated to 120～140 ℃, 40～100 minutes residence time;
(3) the reacted mud of step (2) is cooled to below 100 ℃;
(4) the cooled mud of step (3) is dewatered, obtain the dehydrated sludge cake after liquid and the decrement;
(5) step (4) being deviate from liquid handles through sand filtration processing and micro-filtration, filter entirely then, carry out ultrafiltration and concentration after promptly adding water, always add 3～5 times in water, adopt the inorganic ultra-filtration membrane of molecular weight cut-off 2500, working pressure 0.5MPa, 3～6 times of total cycles of concentration obtain containing the above concentrated solution of humic acid 3wt%;
(6) step (5) gained concentrated solution is added additive, promptly make humic acid liquid fertilizer.
2. thermal treatment-the dehydration of treatment of town sewage and sludge according to claim 1-composting method is characterized in that, described sodium hydroxide weight ratio is 0.08～0.16wt%.
3. thermal treatment-the dehydration of treatment of town sewage and sludge according to claim 1-composting method is characterized in that, described being stirred in the horizontal spiral thermal treater carried out.
4. thermal treatment-the dehydration of treatment of town sewage and sludge according to claim 1-composting method is characterized in that, described cooling is carried out in water cooler.
5. thermal treatment-the dehydration of treatment of town sewage and sludge according to claim 1-composting method is characterized in that, described sand filtration is treated to 1～2mm quartz sand.
6. thermal treatment-the dehydration of treatment of town sewage and sludge according to claim 1-composting method is characterized in that, described micro-filtration is treated to alkaline-resisting mineral membrane, aperture 0.1～1 μ m, mould difference 0.3MPa.
7. thermal treatment-the dehydration of treatment of town sewage and sludge according to claim 1-composting method is characterized in that, described additive is that described additive is one or more in nitrogen, phosphorus, the potassium.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2007103020149A CN101186423A (en) | 2007-12-19 | 2007-12-19 | Heat treatment-dehydration-fertilizer making method for town sewage and sludge |
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| CNA2007103020149A CN101186423A (en) | 2007-12-19 | 2007-12-19 | Heat treatment-dehydration-fertilizer making method for town sewage and sludge |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101905994A (en) * | 2010-06-22 | 2010-12-08 | 山东省科学院新材料研究所 | Method for extracting humic acid liquid fertilizer with rich trace elements from sludge |
| CN101913921A (en) * | 2010-09-06 | 2010-12-15 | 长沙洁湘环保工程有限公司 | Method for preparing compound fertilizer from sludge produced by treatment of town sewage |
| CN101935141A (en) * | 2010-07-30 | 2011-01-05 | 浙江捷丰环保技术工程有限公司 | Method for removing water from sludge in sewage treatment |
| CN101987772A (en) * | 2010-11-23 | 2011-03-23 | 北京机电院高技术股份有限公司 | Method for improving sludge dewatering performance through thermal conditioning of sludge |
| CN101402492B (en) * | 2008-11-19 | 2011-06-29 | 北京桑德环境工程有限公司 | Wastewater treatment system and method for improving coefficient of recovery |
| CN102167490A (en) * | 2011-05-23 | 2011-08-31 | 江苏恒亮离心机制造有限公司 | Integrated treatment method for thickening, drying and purifying municipal sludge |
| CN102849910A (en) * | 2012-10-10 | 2013-01-02 | 清华大学深圳研究生院 | Method for recovering humic acid from sludge and improving anaerobic digestion of sludge |
| CN104478190A (en) * | 2014-11-04 | 2015-04-01 | 清华大学深圳研究生院 | Method for recovering humic acid from sludge |
| CN108033818A (en) * | 2017-12-13 | 2018-05-15 | 北京环清环境科技有限公司 | A kind of organic fertilizer production method |
| CN112811761A (en) * | 2020-12-23 | 2021-05-18 | 山西晋联环境科技有限公司 | Method and system for recovering macromolecular substances in sludge |
| CN112830645A (en) * | 2019-11-22 | 2021-05-25 | 杨山林 | Method and system for separating activated sludge biomass and application |
| CN112830644A (en) * | 2019-11-22 | 2021-05-25 | 杨山林 | Method, system and application for separating activated sludge biomass |
| CN115028479A (en) * | 2022-06-24 | 2022-09-09 | 爱沃特智慧水务(安徽)有限公司 | Method for preparing humic acid plant nutrient solution by utilizing sludge continuous thermal hydrolysis dehydration solution |
| CN116375305A (en) * | 2023-03-30 | 2023-07-04 | 长江生态环保集团有限公司 | Dehydrated sludge treatment process and application of obtained tail water in liquid fertilizer |
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- 2007-12-19 CN CNA2007103020149A patent/CN101186423A/en active Pending
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| CN101402492B (en) * | 2008-11-19 | 2011-06-29 | 北京桑德环境工程有限公司 | Wastewater treatment system and method for improving coefficient of recovery |
| CN101905994A (en) * | 2010-06-22 | 2010-12-08 | 山东省科学院新材料研究所 | Method for extracting humic acid liquid fertilizer with rich trace elements from sludge |
| CN101905994B (en) * | 2010-06-22 | 2013-05-01 | 山东省科学院新材料研究所 | Method for extracting humic acid liquid fertilizer with rich trace elements from sludge |
| CN101935141A (en) * | 2010-07-30 | 2011-01-05 | 浙江捷丰环保技术工程有限公司 | Method for removing water from sludge in sewage treatment |
| CN101913921A (en) * | 2010-09-06 | 2010-12-15 | 长沙洁湘环保工程有限公司 | Method for preparing compound fertilizer from sludge produced by treatment of town sewage |
| CN101987772A (en) * | 2010-11-23 | 2011-03-23 | 北京机电院高技术股份有限公司 | Method for improving sludge dewatering performance through thermal conditioning of sludge |
| CN102167490A (en) * | 2011-05-23 | 2011-08-31 | 江苏恒亮离心机制造有限公司 | Integrated treatment method for thickening, drying and purifying municipal sludge |
| CN102849910A (en) * | 2012-10-10 | 2013-01-02 | 清华大学深圳研究生院 | Method for recovering humic acid from sludge and improving anaerobic digestion of sludge |
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| CN112830645A (en) * | 2019-11-22 | 2021-05-25 | 杨山林 | Method and system for separating activated sludge biomass and application |
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| CN112811761A (en) * | 2020-12-23 | 2021-05-18 | 山西晋联环境科技有限公司 | Method and system for recovering macromolecular substances in sludge |
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