CN104150743A - Method for preparing sludge carbon by virtue of microwave-assisted hydrothermal carbonization - Google Patents
Method for preparing sludge carbon by virtue of microwave-assisted hydrothermal carbonization Download PDFInfo
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- CN104150743A CN104150743A CN201410349427.2A CN201410349427A CN104150743A CN 104150743 A CN104150743 A CN 104150743A CN 201410349427 A CN201410349427 A CN 201410349427A CN 104150743 A CN104150743 A CN 104150743A
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- 239000010802 sludge Substances 0.000 title claims abstract description 98
- 238000003763 carbonization Methods 0.000 title claims abstract description 50
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 49
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000007788 liquid Substances 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000006243 chemical reaction Methods 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 11
- 230000035484 reaction time Effects 0.000 claims description 9
- 238000005406 washing Methods 0.000 claims description 9
- 238000010304 firing Methods 0.000 claims description 8
- 238000000926 separation method Methods 0.000 claims description 8
- 239000012265 solid product Substances 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 22
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 11
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 8
- 239000011574 phosphorus Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 abstract description 2
- 239000002689 soil Substances 0.000 abstract description 2
- 238000002386 leaching Methods 0.000 description 10
- 235000014786 phosphorus Nutrition 0.000 description 10
- 229910052793 cadmium Inorganic materials 0.000 description 9
- 229910052802 copper Inorganic materials 0.000 description 9
- 238000000643 oven drying Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000004615 ingredient Substances 0.000 description 4
- 230000000050 nutritive effect Effects 0.000 description 4
- 239000003610 charcoal Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001473 noxious effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000010801 sewage sludge Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012075 bio-oil Substances 0.000 description 1
- 238000010000 carbonizing Methods 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000004332 deodorization Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000001027 hydrothermal synthesis Methods 0.000 description 1
- 230000001976 improved effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 208000021267 infertility disease Diseases 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 230000000116 mitigating effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001717 pathogenic effect Effects 0.000 description 1
- 230000002085 persistent effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000005180 public health Effects 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for preparing sludge carbon by virtue of microwave-assisted hydrothermal carbonization. The sludge carbon obtained by using the method is stable in quality and high in content of effective phosphorus and effective nitrogen, has a good soil fertilizing effect, and also can be used for effectively reducing or fixing the content of heavy metals in sludge. The method disclosed by the invention is wide in raw material source, low in production cost and simple and feasible in process step, is environment-friendly, and is easy in popularization and application.
Description
Technical field
The present invention relates to manipulation of regeneration and the recycling of mud, relate in particular to the method that sludge carbon is prepared in the carbonization of a kind of microwave-assisted hydro-thermal.
Background technology
Along with the universal and operation of China municipal sewage plant, sludge from wastewater treatment plant output increases fast.Between 2001-2011, the annual production of China's mud is increased to 2,268 ten thousand tons with 15% speed every year on average from 5,670,000 tons.Due to problems such as the poor and water ratio of bioavailability high (most mud when dispatching from the factory still up to 80%), the transportation of excess sludge and safe disposal have been subject to serious restriction.Mud contains the hazardous and noxious substances such as pathogenic agent, heavy metal and persistent organism, without effectively processing and dispose, very easily underground water, soil etc. is caused to secondary pollution, directly threatening environment safety and public health.
Sludge carbonization is a kind of novel sludge disposal technology, not only can successfully realize the minimizing of mud, fixing carbon source simultaneously effectively, and produce carbon back product and can carry out recycling, efficiently solve the poor problem of sludge organism utilizability.At present, traditional sludge carbonization method is mainly dry method charing, refers to that under anoxic or oxygen-free environment, sludge-drying being carried out to pyrolysis makes organism be converted into charcoal, and technique can be summarized as " drying sludge+pyrolyzing sludge ".Main method comprises: (1) high temperature carbonization, for example Chinese patent CN203159415U discloses " sludge high temperature carbonization system ", the utilization of the carbonization carbonizing gas that this carbonization system produces mud in mummification and carbonization is processed and is combined with the high temperature deodorization integration of waste gas, reduce energy consumption, and simplified equipment configuration.For example Chinese patent CN203173945U discloses " sludge high temperature carbide furnace ", can realize 1000 tons of above mass-producings of dewatered sludge day output and process.(2) low-temperature carbonization, for example Chinese patent CN101845311A discloses " pyrolyzing municipal sludge is prepared the method for bio oil and gac simultaneously ", solve the difficult problem that current conventional pyrolyzing sludge method can only obtain single resource product, can obtain high-quality biological oil and gac simultaneously.For example Chinese patent CN103523775A discloses " the agricultural sludge organism charcoal of the treatment process of mud and acquisition thereof ", discloses a kind of low-temperature carbonization method of mud and the agricultural sludge organism charcoal that processing obtains thereof.But traditional sludge dry method charring, all has strict demand to moisture percentage in sewage sludge, need first dewatered sludge to be carried out to mummification pre-treatment, energy consumption is higher, has greatly limited the development of this treatment process.
And hydrothermal carbonization method is without mud is dried in advance, low to the water content requirement of raw sludge, reaction conditions is gentle, and technological process is simple, thereby has obvious advantage in energy charge and production control, is the show of developing new of current charring process.For example Chinese patent CN102875005A discloses " a kind of sludge organism charring process based on hydro-thermal reaction ", and a kind of mud hydro-thermal carbonization technique is provided.
In recent years, microwave technology is clean because having, fast and the advantage such as be easy to control and obtained development rapidly, early 1990s, start microwave technology to introduce the processing of sewage sludge, and comprise the aspects such as the minimizing of mud source, drying sludge.For example Chinese patent CN103204611A discloses " method and apparatus of the source sludge reduction based on microwave sludge pretreatment ", under normal pressure opening condition, by microwave, realize efficiently cracking of residual active sludge, improve the bioavailability of residual active sludge, but it does not carry out recycling to mud.Up to the present there is not yet the report that utilizes the carbonization of microwave-assisted hydro-thermal to prepare sludge carbon.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide the carbonization of a kind of microwave-assisted hydro-thermal to prepare the method for sludge carbon.
The technical solution used in the present invention is:
A method for sludge carbon is prepared in the carbonization of microwave-assisted hydro-thermal, comprises the steps:
(1) water-containing sludge is sent in hydrothermal reactor, sealing, Microwave-assisted firing carries out hydrothermal carbonization reaction, obtains hydrothermal carbonization liquid;
(2) the hydrothermal carbonization liquid obtaining is carried out to solid-liquid separation, solid product washing, dry, obtains sludge carbon.
Preferably, step (1), controlling hydrothermal reactor internal pressure is 2～3 atm.
Preferably, step (1), controlling Heating temperature is 150～300 ℃.
Preferably, step (1), controlling microwave power is 50～800 W.Preferred, step (1), controlling microwave power is 200～600 W.
Preferably, step (1), the hydrothermal carbonization reaction times is 30～150 min.
Preferably, step (1), the water ratio of described water-containing sludge is 50～85wt%.
Preferably, step (2), described drying temperature is 40～60 ℃.
The invention has the beneficial effects as follows:
(1) the inventive method starting material wide material sources, low production cost, processing step is simple, and environmental friendliness is easy to apply.
(2) the sludge carbon stay in grade that the inventive method obtains, available phosphorus, available nitrogen content are high, have good infertile field effect; The method can effectively reduce or the fixing heavy metal content in mud simultaneously.
Embodiment
The invention discloses the carbonization of a kind of microwave-assisted hydro-thermal and prepare the method for sludge carbon, comprise the steps: water-containing sludge to send in hydrothermal reactor, sealing, microwave-assisted carries out hydrothermal carbonization reaction, obtain hydrothermal carbonization liquid, centrifugal, washing, dry, obtains sludge carbon.Product sludge carbon contains a large amount of carbon elements and nutritive ingredient, can be used for land remediation and improvement, and its proterties is stable, repairs, improved effect is lasting for a long time.Sludge carbon or a kind of material of carbon fixation and emission reduction, discharge has mitigation to Global Carbon for its production and use.Raw materials cost that the inventive method adopts is cheap, environmental friendliness, and preparation technology's simple possible has totally been followed the principle of " turn waste into wealth, three-dimensional agriculture ".
The present invention adopts microwave-assisted can accelerate hydrothermal carbonization reaction process on the one hand, can contribute on the other hand the stripping of the noxious pollutants such as heavy metal.
Hydrothermal reactor used is salable, resistance to higher temperatures (200～300 ℃) and high pressure (2～3atm).In hydrothermal reactor, be furnished with temp probe, can in reaction process, control reactor temperature.
Solid-liquid separating method adopts centrifugation or other modes, and centrifugal rotational speed is preferably 3000～6000 rpm.
Below in conjunction with embodiment, the present invention is described further, but embodiments of the present invention are not limited to this.
embodiment 1
The domestic sludge that is 80wt% by water ratio is sent in hydrothermal reactor, sealing, and Microwave-assisted firing carries out hydrothermal carbonization reaction, microwave power is 200W, and reactor pressure is 2.3atm, and hydrothermal temperature is 200 ℃, reaction times is 120 min, obtains hydrothermal carbonization liquid; The centrifugal solid-liquid separation of carrying out of 3000 rpm, solid product washing 3 times, 40 ℃ of oven dryings, obtain sludge carbon.
Sludge carbon productive rate is 67%, and organic content is 28.97%, and its available phosphorus, available nitrogen have increased respectively 33.26%, 36.23% compared with primary sludge, also contain a large amount of carbon elements and nutritive ingredient.Its heavy metal is measured, and the content in the leaching liquor of Cd, Cu has reduced respectively 88.59%, 92.21% compared with primary sludge.
embodiment 2
The domestic sludge that is 85wt% by water ratio is sent in hydrothermal reactor, sealing, and Microwave-assisted firing carries out hydrothermal carbonization reaction, microwave power is 400W, and reactor pressure is 2.2atm, and it is 250 ℃ that hydrothermal temperature is controlled, reaction times is 90 min, obtains hydrothermal carbonization liquid; The centrifugal solid-liquid separation of carrying out of 3500 rpm, solid product washing 3 times, oven drying at 50 ℃, obtains sludge carbon.
Sludge carbon productive rate is 61.5%, and organic content is 24.69%, and its available phosphorus, available nitrogen have increased respectively 33.26%, 35.55% compared with primary sludge.Its heavy metal is measured, and the content in the leaching liquor of Cd, Cu has reduced respectively 83.12%, 95.16% compared with primary sludge.
embodiment 3
The domestic sludge that is 80 wt% by water ratio is sent in hydrothermal reactor, sealing, and Microwave-assisted firing carries out hydrothermal carbonization reaction, microwave power is 600W, and reactor pressure is 3 atm, and hydrothermal temperature is 300 ℃, reaction times is 90 min, obtains hydrothermal carbonization liquid; The centrifugal solid-liquid separation of carrying out of 3000 rpm, solid product washing 3 times, 40 ℃ of oven dryings, obtain sludge carbon.
Sludge carbon productive rate is 55.14%, and organic content is 20.47%, and its available phosphorus, available nitrogen have increased respectively 32. 62%, 36.79% compared with primary sludge, also contain a large amount of carbon elements and nutritive ingredient.Its heavy metal is measured, and the content in the leaching liquor of Cd, Cu has reduced respectively 94.11%, 98.28% compared with primary sludge.
embodiment 4
The municipal sludge that is 80 wt% by water ratio is sent in hydrothermal reactor, sealing, and Microwave-assisted firing carries out hydrothermal carbonization reaction, microwave power is 500W, and reactor pressure is 2 atm, and hydrothermal temperature is 150 ℃, reaction times is 150 min, obtains hydrothermal carbonization liquid; The centrifugal solid-liquid separation of carrying out of 3000 rpm, solid product washing 3 times, 40 ℃ of oven dryings, obtain sludge carbon.
Sludge carbon productive rate is 70.01%, and organic content is 32.12%, and its available phosphorus, available nitrogen have increased respectively 36.70%, 39.53% compared with primary sludge, also contain a large amount of carbon elements and nutritive ingredient.Its heavy metal is measured, and the content in the leaching liquor of Cd, Cu has reduced respectively 90.25%, 94.98% compared with primary sludge.
embodiment 5
The domestic sludge that is 75% by water ratio is sent in hydrothermal reactor, sealing, and Microwave-assisted firing carries out hydrothermal carbonization reaction, microwave power is 250 W, and reactor pressure is 2.2 atm, and hydrothermal temperature is 200 ℃, reaction times is 90 min, obtains hydrothermal carbonization liquid; The centrifugal solid-liquid separation of carrying out of 4000 rpm, solid product washing 3 times, oven drying at 60 ℃, obtains sludge carbon 1.
Similarly, with batch mud, carry out same operation (hydrothermal temperature, reaction times identical) in without microwave situation, obtain sludge carbon 2.
Sludge carbon 1 productive rate is 75.2%, and sludge carbon 2 productive rates are 78%.Mud 1 its available phosphorus, available nitrogen have increased respectively 30.06%, 33.55% compared with primary sludge, and mud 2 its available phosphoruss, available nitrogen have increased respectively 29.26%, 30.55% compared with primary sludge.Its heavy metal is measured, and the content in mud 1 in Cd, Cu leaching liquor has reduced respectively 74.59%, 92.33% compared with primary sludge, and in mud 2, Cd, Cu leaching liquor content have reduced respectively 67.12%, 84.8% compared with primary sludge.
embodiment 6
The domestic sludge that is 80% by water ratio is sent in hydrothermal reactor, sealing, and Microwave-assisted firing carries out hydrothermal carbonization reaction, and microwave power is 200W, and reactor pressure is 2 atm, and hydrothermal temperature is 200 ℃, the reaction times is 120 min, obtains hydrothermal carbonization liquid; The centrifugal solid-liquid separation of carrying out of 4000 rpm, solid product washing 3 times, oven drying at 40 ℃, obtains sludge carbon 1.
To pulverize, cross 60 mesh sieves with batch drying sludge, at sealing (N
2) in retort furnace, 600 ℃ are burnt 4 h, obtain sludge carbon 2.
To pulverize, cross 60 mesh sieves with batch drying sludge, at sealing (N
2) in retort furnace, 400 ℃ are burnt 4 h, obtain sludge carbon 3.
Sludge carbon 1 productive rate is 63.8%, and sludge carbon 2 productive rates are 52.17%, and sludge carbon 3 productive rates are 69.34%.Mud 1 its available phosphorus, available nitrogen have increased respectively 33.6%, 37.9% compared with primary sludge, mud 2 its available phosphoruss, available nitrogen have reduced respectively 53.1%, 82.3% compared with primary sludge, mud 3 its available phosphoruss compared with primary sludge increased by 3.9%, available nitrogen reduced by 76.6% compared with primary sludge.Its heavy metal leaching is measured, content in mud 1 in Cd, Cu leaching liquor has reduced respectively 82.5%, 95.0% compared with primary sludge, in mud 2, Cd, Cu leaching liquor content have reduced respectively 41.5%, 13.69% compared with primary sludge, and in mud 3, Cd, Cu leaching liquor content have reduced respectively 63.3%, 42.7% compared with primary sludge.
Claims (8)
1. a method for sludge carbon is prepared in the carbonization of microwave-assisted hydro-thermal, comprises the steps:
(1) water-containing sludge is sent in hydrothermal reactor, sealing, Microwave-assisted firing carries out hydrothermal carbonization reaction, obtains hydrothermal carbonization liquid;
(2) the hydrothermal carbonization liquid obtaining is carried out to solid-liquid separation, solid product washing, dry, obtains sludge carbon.
2. the method for sludge carbon is prepared in microwave-assisted hydro-thermal according to claim 1 carbonization, it is characterized in that: step (1), controlling hydrothermal reactor internal pressure is 2～3 atm.
3. the method for sludge carbon is prepared in microwave-assisted hydro-thermal according to claim 1 carbonization, it is characterized in that: step (1), controlling Heating temperature is 150～300 ℃.
4. the method for sludge carbon is prepared in microwave-assisted hydro-thermal according to claim 1 carbonization, it is characterized in that: step (1), controlling microwave power is 50～800 W.
5. the method for sludge carbon is prepared in microwave-assisted hydro-thermal according to claim 4 carbonization, it is characterized in that: step (1), controlling microwave power is 200～600 W.
6. the method for sludge carbon is prepared in microwave-assisted hydro-thermal according to claim 1 carbonization, it is characterized in that: step (1), the hydrothermal carbonization reaction times is 30～150 min.
7. the method for sludge carbon is prepared in microwave-assisted hydro-thermal according to claim 1 carbonization, it is characterized in that: step (1), the water ratio of described water-containing sludge is 50～85wt%.
8. the method for sludge carbon is prepared in microwave-assisted hydro-thermal according to claim 1 carbonization, it is characterized in that: step (2), described drying temperature is 40～60 ℃.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105255506A (en) * | 2015-09-10 | 2016-01-20 | 广州中国科学院先进技术研究所 | Method for preparing sludge char through hydrothermal carbonization reinforced by conditioners |
| CN105331376A (en) * | 2015-11-27 | 2016-02-17 | 华中农业大学 | High-valued treatment device and high-valued treatment method for fresh biomass based on microwave hydrothermal carbonization |
| CN106995350A (en) * | 2017-03-27 | 2017-08-01 | 深圳先进技术研究院 | The preparation method and sludge base charcoal slow-release phosphate fertilizer of sludge base charcoal slow-release phosphate fertilizer |
| CN108975305A (en) * | 2018-08-20 | 2018-12-11 | 宁夏和兴碳基材料有限公司 | A method of carbon-based material is prepared using dewatered sludge |
| CN109320043A (en) * | 2018-11-15 | 2019-02-12 | 天津大学 | A kind of method of microwave coupling stabilizer stably desulphurizing sludge heavy-metal |
| CN109772472A (en) * | 2019-01-17 | 2019-05-21 | 四川大学 | A kind of method that high-moisture percentage excess sludge prepares carbon catalysis material |
| CN111908753A (en) * | 2020-08-03 | 2020-11-10 | 宁波首创厨余垃圾处理有限公司 | Method for preparing kitchen waste anaerobic biogas residue biochar through ultrasonic-assisted hydrothermal carbonization |
| CN114180997A (en) * | 2021-12-30 | 2022-03-15 | 天津大学 | Electric method combined with hydrothermal method for preparing sewage and peat fertilizer and method thereof |
| CN114854467A (en) * | 2022-05-06 | 2022-08-05 | 河南城建学院 | Device for preparing solid fuel by blending sludge and wood fiber wastes and performing hydrothermal carbonization |
| CN115072962A (en) * | 2022-06-30 | 2022-09-20 | 东方电气集团东方电机有限公司 | Sludge dewatering method based on ultrasound and hydrothermal carbonization |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105255506A (en) * | 2015-09-10 | 2016-01-20 | 广州中国科学院先进技术研究所 | Method for preparing sludge char through hydrothermal carbonization reinforced by conditioners |
| CN105331376A (en) * | 2015-11-27 | 2016-02-17 | 华中农业大学 | High-valued treatment device and high-valued treatment method for fresh biomass based on microwave hydrothermal carbonization |
| CN106995350A (en) * | 2017-03-27 | 2017-08-01 | 深圳先进技术研究院 | The preparation method and sludge base charcoal slow-release phosphate fertilizer of sludge base charcoal slow-release phosphate fertilizer |
| CN108975305A (en) * | 2018-08-20 | 2018-12-11 | 宁夏和兴碳基材料有限公司 | A method of carbon-based material is prepared using dewatered sludge |
| CN109320043A (en) * | 2018-11-15 | 2019-02-12 | 天津大学 | A kind of method of microwave coupling stabilizer stably desulphurizing sludge heavy-metal |
| CN109772472B (en) * | 2019-01-17 | 2021-10-15 | 四川大学 | Method for preparing carbon catalytic material from high-water-content excess sludge |
| CN109772472A (en) * | 2019-01-17 | 2019-05-21 | 四川大学 | A kind of method that high-moisture percentage excess sludge prepares carbon catalysis material |
| CN111908753A (en) * | 2020-08-03 | 2020-11-10 | 宁波首创厨余垃圾处理有限公司 | Method for preparing kitchen waste anaerobic biogas residue biochar through ultrasonic-assisted hydrothermal carbonization |
| CN111908753B (en) * | 2020-08-03 | 2023-02-28 | 宁波首创厨余垃圾处理有限公司 | Method for preparing kitchen waste anaerobic biogas residue biochar through ultrasonic-assisted hydrothermal carbonization |
| CN114180997A (en) * | 2021-12-30 | 2022-03-15 | 天津大学 | Electric method combined with hydrothermal method for preparing sewage and peat fertilizer and method thereof |
| CN114854467A (en) * | 2022-05-06 | 2022-08-05 | 河南城建学院 | Device for preparing solid fuel by blending sludge and wood fiber wastes and performing hydrothermal carbonization |
| CN114854467B (en) * | 2022-05-06 | 2023-02-24 | 河南城建学院 | Device for preparing solid fuel by blending sludge and wood fiber wastes and performing hydrothermal carbonization |
| CN115072962A (en) * | 2022-06-30 | 2022-09-20 | 东方电气集团东方电机有限公司 | Sludge dewatering method based on ultrasound and hydrothermal carbonization |
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