CN102897984A - Energy-saving and environmental-friendly two-stage sludge drying method - Google Patents
Energy-saving and environmental-friendly two-stage sludge drying method Download PDFInfo
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- CN102897984A CN102897984A CN2012100315784A CN201210031578A CN102897984A CN 102897984 A CN102897984 A CN 102897984A CN 2012100315784 A CN2012100315784 A CN 2012100315784A CN 201210031578 A CN201210031578 A CN 201210031578A CN 102897984 A CN102897984 A CN 102897984A
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- dewatered sludge
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- expelling water
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Abstract
The present invention provides an energy-saving and environmental-friendly two-stage sludge drying method, comprising the steps of: (1) adding an additive to sludge dewatered in a wastewater treatment plant, stacking the sludge into stack body and putting on a ventilation holder, wherein the stack thickness is 1-2 meters, and feeding air from the bottom of the ventilation holder to obtain the first-grade dewatered sludge, wherein the additive is selected from the group consisting of one or more of straw or sawdust; (2) scattering a dewatering agent on the surface of the first-grade dewatered sludge stack body, wherein the thickness of the stack body is 20-30 cm, and standing overnight to obtain dry sludge. The dewatering agent is selected from the group consisting more than one of tricalcium silicate, dicalcium silicate, tricalcium aluminate or gypsum. The drying method has the advantages of low investment, low energy consumption, low operating cost, flexible product usage, etc. While the odor has less secondary pollution, the product is basically stable, no odor is released, the viscosity of sludge disappears, the sludge is conducive to storage, transportation and further processing.
Description
Technical field
The present invention relates to a kind of sludge drying method.
Background technology
In recent years, along with the municipal wastewater treatment plant scale constantly enlarges, a large amount of mud of generation are becoming a global problem gradually.Mud is about its water ratio after the processed is still up to 80%.For can landfill or burning, need to carry out further pre-treatment, water cut reaches the requirement of next step processing.
At present, conventional method is as follows:
1 heating power mummification: the finding mode is many in the city, for example turns round the sleeve mummification; Vertical backflow mummification; The fluidized-bed mummification; The blade desiccation machine; Waste heat flue gas mummification etc.Remove moisture content with heat energy, energy fluence consumption is large, invests in real world applications greatly, and running cost is high.And the waste gas of discharging has secondary pollution to environment.Though in the city application is arranged at present, this is caving-in bash.
2 mechanical dehydrations: common mechanical dehydration has filter press in the city at present; Centrifuge dehydration; Belt type filter-pressing dehydration plant; Screw press dehydration etc.All in the scope about 75%～85%, so dehydration is not thorough, the terminal resource utilization does not reach requirement for all this several types, the mud terminal moisture content after the dehydration.Same disadvantage is that investment is large, and running cost is high, and effect is undesirable, and tool may to the recycling in rear road.
3 thermal machines combination dehydration: such as mechanical balling-up, heating power mummification, example is arranged also in the city.But this method only is to have improved a point efficiency in certain this link of original base, can't resolve the problem of essence.At first will have and can utilize waste heat, but this dependence limitation to heat is very large: be on the one hand all trades and professions all in energy-saving and emission-reduction, dependable waste heat is fewer and feweri; On the other hand, such as household heat source, invest more surprising.Therefore it is possible some indivedual examples under given conditions occurring in the city, but will say that generally popularization is difficult to realize.The significant defective that above-mentioned method exists is that not environmental protection, facility investment are large.
Summary of the invention
The two-stage sludge drying method that the purpose of this invention is to provide a kind of energy-conserving and environment-protective, the defective that exists to overcome prior art.
Method of the present invention comprises the steps:
(1) additive is added the Sewage Plant dewatered sludge, and pile the heap body, frame is on ventilation frame, and the thickness of heap body is 1～2 meter, passes into air from the ventilation frame bottom, turning in per 2～4 days once, ventilation is 0.01～0.1 (m
3H
-1Kg
-1) condition under, biological expelling water through 15-20 days, obtain one section dewatered sludge, water ratio is reduced to 50-60% from about 70% of the starting stage, weight-loss ratio and volume reduction rate reach respectively 23-55% and 27-35%, organic (VS) degradation rate reaches 19-38%, and the Lower heat value of products therefrom (LHV) is not less than 5000kJkg
-1
Preferably:
At front 10 days, every interval 15～25min passed into air 8～12min;
After 10 days: every interval 8～12min passes into air 45～55min;
Best turning frequency 4 days/time, optimal ventilation speed 0.05m
3H
-1Kg
-1
Described additive is selected from more than one in straw or the wood chip, and the adding weight of additive is 10～20% of Sewage Plant dewatered sludge; The particle diameter of additive is 2～30mm;
Preferred additive is selected from straw, and particle diameter is 2～30mm;
The weight moisture capacity of described Sewage Plant dewatered sludge is 70～80%, and proportion is 500～700kg/m
3, the weight content of organic (VS) is 60～70%, Lower heat value is 500～800kJkg
-1
(2) the expelling water agent is sprinkling upon one section dewatered sludge heap surface, the thickness of heap body is 20～30cm, then spends the night, and obtains dewatered sludge;
Described expelling water agent is selected from tricalcium silicate (3CaOSiO
2), Dicalcium Phosphate (Feed Grade) (2CaOSiO
2), tricalcium aluminate (3CaOAl
2O
3) or gypsum in more than one, the adding weight of expelling water agent is 0.1～0.5% of one section dewatered sludge;
Adopt above-mentioned two-stage sludge drying method, can make the water ratio of Sewage Plant dewatered sludge be reduced to 40%, weight-loss ratio and volume reduction rate reach respectively 20%-60% and 30-40%, organic (VS) degradation rate reaches 10-40%, and the Lower heat value of products therefrom (LHV) is not less than 4000kJkg
-1
Two-stage sludge drying method of the present invention, during one section mummification, the heat that the hydrolysis of organic matter that utilizes biomass waste itself to have produces is motivating force, cooperate different ventilations and turning frequency, form stable mass transfer condition, make steam enter the gas phase main body and distribute, make the moisture vaporization in the waste and overflow loose, realize decline and the organic preliminarily stabilised of water ratio, when two sections mummification, add a small amount of expelling water agent, give full play to the two advantage of bioenergy expelling water and chemical expelling water.Mummification thermo-efficiency is high, and safe and reliable, whole system takes full advantage of the energy of mud self, reduces energy consumption, energy-conserving and environment-protective.
The invention has the beneficial effects as follows that very significant, maximum characteristics are need not external heat source, the required energy derive of mummification is movable in the aerobic fermentation of microorganism, belongs to the bioenergy of material itself, so is a kind of very economical energy-conservation drying technique.Another characteristics of present technique are to have added artificial control strategy, and material is carried out forced-air blast, thereby promote whole drying process, shorten the mummification cycle.Compare with heat drying, mechanical mummification, this technology has low, the energy consumption of investment and the advantage such as running cost is low, end-use is flexible, and the simultaneously secondary pollution of foul smell is few, product is basicly stable, do not have odor dispersion, the mud viscosity diminishes is conducive to store, transports and further processes.
Description of drawings
Heap body synoptic diagram when Fig. 1 is ventilation.
Embodiment
Embodiment 1
The weight moisture capacity of described Sewage Plant dewatered sludge is 80%, and proportion is 660kg/m
3, the weight content of organic (VS) is 61%, Lower heat value is 500kJkg
-1
Referring to Fig. 1, method of the present invention comprises the steps:
(1) additive is added the Sewage Plant dewatered sludge, and pile body 2, frame is on ventilation frame 1, and the thickness of heap body is 1 meter, passes into air from the ventilation frame bottom, and at front 10 days, every interval 25min passed into air 8min; After 10 days: every interval 12min passes into air 45min;
Turning in per 2 days once, ventilation is 0.05 (m
3H
-1Kg
-1) condition under, through the biological expelling water of 20d, obtain one section dewatered sludge;
Additive is selected from straw, and the adding weight of additive is 15% of Sewage Plant dewatered sludge; The particle diameter of additive is 5mm;
(2) the expelling water agent is sprinkling upon one section dewatered sludge heap surface, the thickness of heap body is 20cm, then spends the night, and obtains dewatered sludge;
The expelling water agent is tricalcium silicate (3CaOSiO
2), the adding weight of expelling water agent is 0.1% of one section dewatered sludge;
The water ratio of Sewage Plant dewatered sludge is reduced to 41%, and weight-loss ratio and volume reduction rate reach respectively 30% and 35%, and organic (VS) degradation rate reaches 20%, and the Lower heat value of products therefrom (LHV) is not less than 4000kJkg
-1
Embodiment 2
The weight moisture capacity of Sewage Plant dewatered sludge is 70%, and proportion is 750kg/m
3, the weight content of organic (VS) is 70%, Lower heat value is 760kJkg
-1
Referring to Fig. 1, method of the present invention comprises the steps:
(1) additive is added the Sewage Plant dewatered sludge, and pile body 2, frame is on ventilation frame 1, and the thickness of heap body is 2 meters, passes into air from ventilation frame 1 bottom, and at front 10 days, every interval 15min passed into air 12min; After 10 days: every interval 8min passes into air 55min;
Turning in per 4 days once, ventilation is 0.1 (m
3H
-1Kg
-1) condition under, through the biological expelling water of 15d, obtain one section dewatered sludge;
Additive is selected from the mixture of straw and wood chip, and weight ratio is 1: 1, and the adding weight of additive is 20% of Sewage Plant dewatered sludge; The particle diameter of additive is 25mm;
(2) the expelling water agent is sprinkling upon one section dewatered sludge heap surface, the thickness of heap body is 30cm, then spends the night, and obtains dewatered sludge;
The expelling water agent is tricalcium aluminate (3CaOAl
2O
3), the adding weight of expelling water agent is 0.4% of one section dewatered sludge.
The water ratio of Sewage Plant dewatered sludge is reduced to 42%, and weight-loss ratio and volume reduction rate reach respectively 50% and 27%, and organic (VS) degradation rate reaches 30%, and the Lower heat value of products therefrom (LHV) is not less than 4200kJkg
-1
Claims (6)
1. the two-stage sludge drying method of energy-conserving and environment-protective is characterized in that, comprises the steps:
(1) additive is added the Sewage Plant dewatered sludge, and pile the heap body, frame is on ventilation frame, and the thickness of heap body is 1～2 meter, passes into air from the ventilation frame bottom, obtains one section dewatered sludge;
Described additive is selected from more than one in straw or the wood chip
(2) the expelling water agent is sprinkling upon one section dewatered sludge heap surface, the thickness of heap body is 20～30cm, then spends the night, and obtains dewatered sludge;
Described expelling water agent is selected from more than one in tricalcium silicate, Dicalcium Phosphate (Feed Grade), tricalcium aluminate or the gypsum.
2. method according to claim 1 is characterized in that, in the step (1), turning in per 2～4 days once, ventilation is 0.01～0.1 (m
3H
-1Kg
-1) condition under, through 15-20 days biological expelling water, obtain one section dewatered sludge.
3. method according to claim 2 is characterized in that, at front 10 days, every interval 15～25min passed into air 8～12min; After 10 days: every interval 8～12min passes into air 45～55min.
4. method according to claim 3 is characterized in that, turning frequency 4 days/time, rate of venting 0.05m
3H
-1Kg
-1
5. each described method is characterized in that according to claim 1～4, and the adding weight of additive is 10～20% of Sewage Plant dewatered sludge; The particle diameter of additive is 2～30mm.
6. method according to claim 1 is characterized in that, the adding weight of expelling water agent is 0.1～0.5% of one section dewatered sludge.
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|---|---|---|---|
| CN201210031578.4A CN102897984B (en) | 2012-02-13 | 2012-02-13 | The two-stage sludge drying method of energy-conserving and environment-protective |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210031578.4A CN102897984B (en) | 2012-02-13 | 2012-02-13 | The two-stage sludge drying method of energy-conserving and environment-protective |
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| CN102897984A true CN102897984A (en) | 2013-01-30 |
| CN102897984B CN102897984B (en) | 2015-09-09 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103936247A (en) * | 2014-04-29 | 2014-07-23 | 湖南科技大学 | Device for drying and decomposing excess sludge by using straw as filler without turning |
| CN103951155A (en) * | 2014-05-05 | 2014-07-30 | 湖南科技大学 | Quick composting-drying method of residual sludge by taking straws as filler |
| CN112624555A (en) * | 2020-12-25 | 2021-04-09 | 无锡国联环保科技股份有限公司 | Method and system for thermal alkali hydrolysis treatment of sludge |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004082016A (en) * | 2002-08-28 | 2004-03-18 | Clay Baan Gijutsu Kenkyusho:Kk | Treatment method of sludges with high water content |
| CN101597132A (en) * | 2009-06-02 | 2009-12-09 | 清华大学 | Biological drying method of urban wastewater sludge |
| CN102212403A (en) * | 2011-05-13 | 2011-10-12 | 江苏欣法环保科技有限公司 | Method and device for preparing formed sludge fuel |
-
2012
- 2012-02-13 CN CN201210031578.4A patent/CN102897984B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004082016A (en) * | 2002-08-28 | 2004-03-18 | Clay Baan Gijutsu Kenkyusho:Kk | Treatment method of sludges with high water content |
| CN101597132A (en) * | 2009-06-02 | 2009-12-09 | 清华大学 | Biological drying method of urban wastewater sludge |
| CN102212403A (en) * | 2011-05-13 | 2011-10-12 | 江苏欣法环保科技有限公司 | Method and device for preparing formed sludge fuel |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103936247A (en) * | 2014-04-29 | 2014-07-23 | 湖南科技大学 | Device for drying and decomposing excess sludge by using straw as filler without turning |
| CN103936247B (en) * | 2014-04-29 | 2015-10-28 | 湖南科技大学 | A kind of take straw as the not turning excess sludge mummification of weighting material and the device that becomes thoroughly decomposed |
| CN103951155A (en) * | 2014-05-05 | 2014-07-30 | 湖南科技大学 | Quick composting-drying method of residual sludge by taking straws as filler |
| CN112624555A (en) * | 2020-12-25 | 2021-04-09 | 无锡国联环保科技股份有限公司 | Method and system for thermal alkali hydrolysis treatment of sludge |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102897984B (en) | 2015-09-09 |
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Inventor after: Fang Jingjing Inventor after: Liu Hong Inventor after: Fu Jiyao Inventor after: Xu Xinhong Inventor after: Xu Linjun Inventor after: Xiao Cunjie Inventor after: Lu Yijun Inventor after: Fang Bojie Inventor before: Fang Jingjing Inventor before: Xu Linjun Inventor before: Xiao Cunjie Inventor before: Xu Xinhong Inventor before: Lu Yijun |
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Free format text: CORRECT: INVENTOR; FROM: FANG JINGJING XU LINJUN XIAO CUNJIE XU XINHONG LU YIJUN TO: FANG JINGJING LIU HONG FU JIYAO XU XINHONG XU LINJUN XIAO CUNJIE LU YIJUN FANG BOJIE |
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