CN103613265A - Sludge drying method - Google Patents
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- CN103613265A CN103613265A CN201310673052.0A CN201310673052A CN103613265A CN 103613265 A CN103613265 A CN 103613265A CN 201310673052 A CN201310673052 A CN 201310673052A CN 103613265 A CN103613265 A CN 103613265A
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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Abstract
The invention discloses a sludge drying method. The method comprises the following steps of: (1) carrying out microbubble amplification on sludge: adding solid sodium hydroxide into mechanically dehydrated sludge, and then carrying out microbubble amplification on the sludge through high-speed stirring so that the density of the sludge subjected to microbubble amplification is reduced to 0.65 g/mL-0.75 g/mL; (2) carrying out solar energy drying: spreading the sludge subjected to microbubble amplification in a solar greenhouse for solar energy drying until the water content of the sludge is 30%-40%. The sludge is dried by using microbubble amplification in combination with solar energy drying, thus the sludge drying method has the advantages of good dehydration property, high drying efficiency, short drying time, low treatment cost and the like and is capable of realizing resource utilization of the sludge.
Description
technical field
The present invention relates to the sludge treatment disposal technology in field of environmental engineering, be specifically related to a kind of drying method for sludge.
background technology
Mud refers to general designation separated in the treating processes of sanitary sewage and trade effluent or solid matter that dam.In recent years, along with China is dirty, the increase day by day of wastewater treatment capacity, the sludge yield in treating processes also sharply increases.Mud contains a large amount of poisonous, harmful or materials that environment is had a negative impact conventionally as the by product of sewage disposal, if do not carried out appropriate processing, disposes, and to ecotope and human health, all will constitute a serious threat.In the processing disposal process of mud, key link is exactly to reduce the water ratio of mud, thereby reduces sludge volume, improves collection, storage, the transport efficiency of mud.
At present, the method for sludge dewatering mainly contains mechanical dehydration, seasoning and high temperature heated drying method.Comparatively speaking, mechanical dehydration easy and simple to handle, but water separation capability is limited, and general moisture percentage in sewage sludge after mechanical dehydration is still 65%～85%.Realize the deep dehydration to mud, conventionally need to adopt seasoning and two kinds of methods of high temperature heated drying.
Though high temperature heated drying method can be down to moisture percentage in sewage sludge below 40%, its energy consumption is excessive, generally the water ratio of mud is down to 40% by 85%, and the energy expenditure of heat drying is 479MJ～750MJ, so economic worth is not high.Solar energy drying is one of nature drying method, because it takes full advantage of natural sun power, has energy-saving and cost-reducing realistic meaning.Meanwhile, there is abundant solar energy resources in China, and the sun power year radiation quantity on about 2/3 territory approaches or surpasses 5000MJ/m
2, annual sunshine time surpasses 2200h, belong to solar energy resources and enrich or more rich area, so the method for solar energy drying has good application prospect in China.
But solar energy drying has again the inefficient shortcoming of drying sludge.Conventionally, thickness is the mud of 30cm left and right, and its water ratio is down to 40% by 88%, in the summer of solar radiation abundance, still needs 8～14d, at plum rain season, needs the time about one month.For improving the processing efficiency of solar energy drying, emerge improving one's methods of multiple solar drying technology both at home and abroad, mainly concentrate on the improvement aspect of solar energy drying system, based on greenhouse type sun greenhouse or assisted heat pump, solar energy heat collector etc., be heated into for topmost research platform.Aspect sludge pretreatment, publication number is that CN102633421A, name are called and in the Chinese patent literature of method > > of a < < sludge drying, disclose microvesicle amplification and process the improvement for drying sludge performance.But, by mud being carried out to carry out again the method for solar energy drying after pre-treatment, also rarely have report.For how the microvesicle amplification of mud being processed and to be combined with solar energy drying, and overcoming the two in conjunction with the technological difficulties that run into, the research that further reduces the water ratio of mud and improve the solar energy drying processing efficiency of mud, there is not yet report especially.If can make full use of natural sun power, reduce sludge treatment cost, and improve the unit surface steam output of mud, and then improve the processing efficiency of solar energy drying, for " minimizing, stabilization, innoxious, the resource utilization " that realize mud, have important practical significance and economic worth.
summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiencies in the prior art, and the drying method for sludge that a kind of dewatering is good, drying efficiency is high, processing cost is low is provided.
For solving the problems of the technologies described above, the technical solution used in the present invention is a kind of drying method for sludge, comprises the following steps:
(1) mud microvesicle amplification: add solid sodium hydroxide in the mud after mechanical dehydration, then by high-speed stirring, mud is carried out to microvesicle amplification, make the sludge density after microvesicle amplification be down to 0.65g/mL～0.75g/mL;
(2) solar energy drying: the mud stand after above-mentioned microvesicle amplification is piled in solar energy greenhouse, carry out solar energy drying, until moisture percentage in sewage sludge is 30%～40%.
In above-mentioned drying method for sludge, preferred, the moisture percentage in sewage sludge after described mechanical dehydration is 75%～85%.
In above-mentioned drying method for sludge, preferred, the quality that adds of described solid sodium hydroxide is 0.8%～1.2% of mud weight in wet base after described mechanical dehydration.
In above-mentioned drying method for sludge, preferred, the speed of described high-speed stirring is 180r/min～300r/min.
In above-mentioned drying method for sludge, preferred, described mud spreads out the strip that is shaped as of heap, be strip mud stand heap, the length of described strip mud stand heap is 3m～4m, and width is 1.5m～2m, thickness is 50cm～80cm, and the space between piles of described strip mud stand heap is 0.5m～0.8m.
In above-mentioned drying method for sludge, preferred, the condition in described solar energy greenhouse is: wind speed is 0.2m/s～1.2m/s, and temperature is 30 ℃～60 ℃, and humidity is 20%～50%.
In above-mentioned drying method for sludge, preferred, in described solar energy drying process, the turning frequency of mud is 5 times/day～10 times/day.
In above-mentioned drying method for sludge, preferred, the device that described solar energy drying adopts is heat collector-greenhouse type solar energy drying system, and thermal barrier is air; The process of described heat collector-greenhouse type solar energy drying system sludge-drying is: daytime, air is sent in heat collector and heated, form warm air, by blower fan, a part of warm air is sent into solar energy greenhouse mud is dried, another part warm air is sent in thermophore and is stored; At night, the warm air in thermophore is sent into solar energy greenhouse by blower fan and continue mud to be dried.
In above-mentioned drying method for sludge, preferred, the heating surface of described solar energy greenhouse is towards positive the south, and lighting surface inclination angle is local latitude, adopts the gas flow pattern of bottom air inlet, top air draft in described solar energy greenhouse.
In above-mentioned drying method for sludge, preferred, the mud after described solar energy drying carries out compacting and discharges in described solar energy greenhouse, finally in the mode of burning or soil utilization, disposes.
Compared with prior art, the invention has the advantages that:
(1) method that the present invention adopts microvesicle amplification pre-treatment to combine with solar energy drying is dried mud, in mud microvesicle amplification pre-treatment, additive is only solid sodium hydroxide, add quality and be 0.8%～1.2% of mud weight in wet base after mechanical dehydration, compare with the CaO of prior art, in the present invention, the dosage of additive greatly reduces, the speed of mud microvesicle amplification obviously improves, and the operation steps of mud microvesicle amplification obtains very large simplification.Through the microvesicle pretreated mud that increases, carry out again solar energy drying, utilizing on the basis of natural sun power, give full play to the advantage that microvesicle amplification mud unit surface steam output is high, drying rate is fast, significantly shortened the time of solar energy drying, improved the processing efficiency of solar energy drying.
(2) method processing step of the present invention is simple, and the microvesicle amplification rate of mud is fast, and solar energy drying efficiency is high, and the moisture percentage in sewage sludge after dehydration is low, is convenient to subsequent disposal.The present invention has important practical significance for " minimizing, stabilization, innoxious, the resource utilization " that realize mud.
(3) mud of the present invention is after microvesicle amplification and solar energy drying, by compacting, can greatly reduce sludge volume, thereby reduce the trucking costs of mud, cost-saving, and dried moisture percentage in sewage sludge is lower, meet country about the relevant criterion of sludge disposal, can directly through modes such as burning, soil utilizations, carry out final disposal, realize the recycling of mud.
accompanying drawing explanation
Fig. 1 is the process flow sheet of drying method for sludge of the present invention.
Fig. 2 is the structural representation of solar energy greenhouse in the present invention.
Fig. 3 is the change curve of the water ratio of microvesicle amplification mud and dewatered sludge in embodiment 1 with the solar energy drying time.
Fig. 4 is the change curve of the water ratio of microvesicle amplification mud and dewatered sludge in embodiment 2 with the solar energy drying time.
Fig. 5 be in embodiment 2 after microvesicle amplification and solar energy drying the local shape appearance figure of gained sludge-drying.
Marginal data:
1, mud inlet; 2, mud mouth; 3, inlet mouth; 4, air outlet; 5, sludge-turning machine; 6, solar radiation.
embodiment
Below in conjunction with Figure of description, the invention will be further described with concrete preferred embodiment, but protection domain not thereby limiting the invention.
A drying method for sludge of the present invention, its technical process as shown in Figure 1, comprises the following steps:
(1) mud microvesicle amplification: after learn from else's experience from storage mud room gravity concentration and mechanical dehydration (municipal sewage plant's processing), water ratio is 83%, density is that the dewatered sludge of 1.05g/mL is placed in agitator, then in this dewatered sludge, add quality to account for the solid sodium hydroxide of dewatered sludge weight in wet base 1%, high-speed stirring, stirring velocity is 200rpm, and after stirring 20min, obtaining density is the microvesicle amplification mud of 0.70g/mL.
(2) solar energy drying: pile in solar energy greenhouse at the microvesicle that is 0.70g/mL by above-mentioned density amplification mud stand, and its heap body is strip, and pile at strip mud stand, and thickness is 50cm, and width is 1.5m, and length is 4m, the space between piles of strip mud stand heap is 0.8m.In solar energy greenhouse, utilize sun power to be dried in the microvesicle mud that increases, the wind speed in solar energy greenhouse (being speed air flow) is controlled at 0.5m/s～0.9m/s, and temperature is controlled at 42 ℃～50 ℃, and humidity is controlled at 39.2%～43.7%.In solar energy greenhouse, the regulation and control of temperature or humidity realize by the wind speed changing in greenhouse, the controller of temperature or humidity is connected with wind speed variable valve, when the temperature in greenhouse or humidity surpass set(ting)value, controller can regulate wind speed variable valve automatically, by the control to wind speed, realizes the adjusting to humiture.Microvesicle in solar energy greenhouse amplification mud stirs once (6 times/day) every 4h, and measures its water ratio, and result as shown in Figure 3, obtains water ratio and be 33.6% sludge-drying after 80h.The dewatered sludge that the density that above-mentioned microvesicle amplification mud is taken out with sewage work is 1.05g/mL contrasts, and in solar energy greenhouse, dewatered sludge does not increase and just directly carries out solar energy drying processing through microvesicle.Under same mummification condition, after dry 80h, the water ratio of dewatered sludge is down to 70.4%, and the water ratio of microvesicle amplification mud is down to 33.6%.As shown in Figure 3, that the water ratio of microvesicle amplification mud and dewatered sludge is with the curve of solar energy drying time variation, known by contrasting, the solar energy drying speed of the mud of processing through microvesicle amplification is apparently higher than the dewatered sludge drying rate of processing without microvesicle amplification, the method that adopts microvesicle amplification to combine with solar energy drying is dried mud, has improved the processing efficiency of solar energy drying.
The subsequent disposal of sludge-drying: the mud after solar energy drying in the present embodiment is carried out to compacting, and what compacting adopted is that crawler belt rolls real machine; By the sludge-drying after compacting burn, soil utilization, complete final disposal, reclaim the available stock in mud simultaneously.
As shown in Figure 2, the solar energy greenhouse size that the present embodiment adopts is 6m * 5m * 4m, and solar energy greenhouse is provided with mud inlet 1, mud mouth 2, inlet mouth 3, air outlet 4, is also equiped with sludge-turning machine 5 in solar energy greenhouse.Solar energy greenhouse adopts double-layer cement wall body structure, between double wall, leave hollow layer, for thermal insulation layer, top is triangular structure, accepts solar radiation 6, and heating surface is towards positive the south, lighting surface inclination angle is local latitude, top adopts double glazing material, and glass bottom adds layer of plastic film, plays insulation effect.In solar energy greenhouse, adopt bottom air inlet, the gas flow pattern of top air draft.The device that solar energy drying adopts is heat collector-greenhouse type solar energy drying system, and thermal barrier is air.On daytime, first air enters heat collector, and in heat collector, after heating, a part of warm air enters solar energy greenhouse by blower fan, and another part enters in thermophore (filler is wood chip and pebbles) and stores.At night, the warm air in thermophore enters solar energy greenhouse by blower fan, continues mud to be dried.What the heat-sink material of heat collector adopted is PC solar heat-collection plate, plates absorber coatings on collecting plate simultaneously, in order to abundant absorption sun power, reduces sun reflection of light.
A drying method for sludge of the present invention, its technical process as shown in Figure 1, comprises the following steps:
(1) mud microvesicle amplification: after learn from else's experience from storage mud room gravity concentration and mechanical dehydration (municipal sewage plant's processing), water ratio is 83%, density is that the dewatered sludge of 1.05g/mL is placed in agitator, then in dewatered sludge, add quality to account for the solid sodium hydroxide stirring of dewatered sludge weight in wet base 1.2%, high-speed stirring, stirring velocity is 200rpm, and after stirring 12min, obtaining density is the microvesicle amplification mud of 0.70g/mL.
(2) solar energy drying: pile in solar energy greenhouse at the microvesicle that is 0.70g/mL by above-mentioned density amplification mud stand, its heap body is strip, thickness is 60cm, width is 1.8m, and length is 4m, and the distance between strip sludge is 0.5m, utilize sun power to be dried, every 3h, stir once (8 times/day), and measure its water ratio, result as shown in Figure 4.Wind speed in solar energy greenhouse is controlled at 1.0m/s～1.2m/s, and temperature is controlled at 42 ℃～50 ℃, and humidity is controlled at 28.5%～33.1%.
The dewatered sludge that the density that above-mentioned microvesicle amplification mud is taken out with sewage work is 1.05g/mL contrasts, and in solar energy greenhouse, dewatered sludge does not increase and just directly carries out solar energy drying processing through microvesicle.Under same mummification condition, the water ratio of dewatered sludge after solar energy drying 48h is down to 35.8%, and the microvesicle of above-mentioned the present embodiment amplification mud is only just down to 36.1% with solar energy drying 30h water ratio, than dewatered sludge is few, use 18 hours, saved for 3/8 time of drying.As shown in Figure 4, it is the curve that microvesicle amplification mud and dewatered sludge water ratio changed with the solar energy drying time, known by contrasting, the drying rate of microvesicle amplification mud is apparently higher than the drying rate of dewatered sludge, the method that adopts microvesicle amplification to combine with solar energy drying is dried mud, significantly shorten the time of solar energy drying, improved the processing efficiency of solar energy drying.As shown in Figure 5, be the local shape appearance figure of final gained sludge-drying after microvesicle amplification and solar energy drying, as shown in Figure 5, in sludge-drying, there are a lot of holes, be very easily compacted, can effectively reduce the volume of mud.
The subsequent disposal of sludge-drying: the sludge-drying that in the present embodiment, gained water ratio is 36.1% after solar energy drying is carried out to compacting, and what compacting adopted is that crawler belt rolls real machine; By the sludge-drying after compacting burn, soil utilization, complete final disposal, reclaim the available stock in mud simultaneously.
As shown in Figure 2, the solar energy greenhouse size that the present embodiment adopts is 6m * 5m * 4m, and solar energy greenhouse is provided with mud inlet 1, mud mouth 2, inlet mouth 3, air outlet 4, is also equiped with sludge-turning machine 5 in solar energy greenhouse.Solar energy greenhouse adopts double-layer cement wall body structure, between double wall, leave hollow layer, for thermal insulation layer, top is triangular structure, accepts solar radiation 6, and heating surface is towards positive the south, lighting surface inclination angle is local latitude, top adopts double glazing material, and glass bottom adds layer of plastic film, plays insulation effect.In solar energy greenhouse, adopt bottom air inlet, the gas flow pattern of top air draft.The device that solar energy drying adopts is heat collector-greenhouse type solar energy drying system, and thermal barrier is air.On daytime, first air enters heat collector, and in heat collector, after heating, a part of warm air enters solar energy greenhouse by blower fan, and another part enters in thermophore and stores.At night, the warm air in thermophore enters solar energy greenhouse by blower fan, continues mud to be dried.What the heat-sink material of heat collector adopted is PC solar heat-collection plate, plates absorber coatings on collecting plate simultaneously, in order to abundant absorption sun power, reduces sun reflection of light.
The above is only the preferred embodiment of the present invention, and protection scope of the present invention is also not only confined to above-described embodiment.All technical schemes belonging under thinking of the present invention all belong to protection scope of the present invention.Be noted that for those skilled in the art, improvements and modifications under the premise without departing from the principles of the invention, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a drying method for sludge, comprises the following steps:
(1) mud microvesicle amplification: add solid sodium hydroxide in the mud after mechanical dehydration, then by high-speed stirring, mud is carried out to microvesicle amplification, make the sludge density after microvesicle amplification be down to 0.65g/mL～0.75g/mL;
(2) solar energy drying: the mud stand after above-mentioned microvesicle amplification is piled in solar energy greenhouse, carry out solar energy drying, until moisture percentage in sewage sludge is 30%～40%.
2. drying method for sludge according to claim 1, is characterized in that, the moisture percentage in sewage sludge after described mechanical dehydration is 75%～85%.
3. drying method for sludge according to claim 1, is characterized in that, the quality that adds of described solid sodium hydroxide is 0.8%～1.2% of mud weight in wet base after described mechanical dehydration.
4. drying method for sludge according to claim 1, is characterized in that, the speed of described high-speed stirring is 180r/min～300r/min.
5. drying method for sludge according to claim 1, it is characterized in that, described mud spreads out the strip that is shaped as of heap, it is strip mud stand heap, the length of described strip mud stand heap is 3m～4m, width is 1.5m～2m, and thickness is 50cm～80cm, and the space between piles of described strip mud stand heap is 0.5m～0.8m.
6. drying method for sludge according to claim 1, is characterized in that, the condition in described solar energy greenhouse is: wind speed is 0.2m/s～1.2m/s, and temperature is 30 ℃～60 ℃, and humidity is 20%～50%.
7. drying method for sludge according to claim 1, is characterized in that, in described solar energy drying process, the turning frequency of mud is 5 times/day～10 times/day.
8. according to the drying method for sludge described in any one in claim 1～7, it is characterized in that, the device that described solar energy drying adopts is heat collector-greenhouse type solar energy drying system, and thermal barrier is air; The process of described heat collector-greenhouse type solar energy drying system sludge-drying is: daytime, air is sent in heat collector and heated, form warm air, by blower fan, a part of warm air is sent into solar energy greenhouse mud is dried, another part warm air is sent in thermophore and is stored; At night, the warm air in thermophore is sent into solar energy greenhouse by blower fan and continue mud to be dried.
9. according to the drying method for sludge described in any one in claim 1～7, it is characterized in that, the heating surface of described solar energy greenhouse is towards positive the south, and lighting surface inclination angle is local latitude, adopts the gas flow pattern of bottom air inlet, top air draft in described solar energy greenhouse.
10. according to the drying method for sludge described in any one in claim 1～7, it is characterized in that, the mud after described solar energy drying carries out compacting and discharges in described solar energy greenhouse, finally in the mode of burning or soil utilization, disposes.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107477991A (en) * | 2017-07-04 | 2017-12-15 | 浙江工业大学 | Solar energy and the united sludge drying system of biogas combustion radiator |
| CN113181878A (en) * | 2021-05-13 | 2021-07-30 | 湖南省林业科学院 | Method for preparing sludge-based biochar through microbubble drying-low-oxygen baking pretreatment |
| CN113413874A (en) * | 2021-07-09 | 2021-09-21 | 湖南省林业科学院 | Method for preparing sludge-based biochar by virtue of drying, coupling and pyrolysis of mixed microbubbles |
| CN113828261A (en) * | 2021-09-02 | 2021-12-24 | 中农新科(苏州)有机循环研究院有限公司 | Heat-preservation temperature-control organic waste biological drying reactor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381826A (en) * | 2011-07-27 | 2012-03-21 | 江苏龙腾工程设计有限公司 | Greenhouse-heat collector-type solar sludge drying system and method |
| CN102633421A (en) * | 2012-04-18 | 2012-08-15 | 湖南大学 | Sludge drying method |
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2013
- 2013-12-12 CN CN201310673052.0A patent/CN103613265B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102381826A (en) * | 2011-07-27 | 2012-03-21 | 江苏龙腾工程设计有限公司 | Greenhouse-heat collector-type solar sludge drying system and method |
| CN102633421A (en) * | 2012-04-18 | 2012-08-15 | 湖南大学 | Sludge drying method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107477991A (en) * | 2017-07-04 | 2017-12-15 | 浙江工业大学 | Solar energy and the united sludge drying system of biogas combustion radiator |
| CN107477991B (en) * | 2017-07-04 | 2019-11-05 | 浙江工业大学 | Solar energy and the united sludge drying system of biogas combustion radiator |
| CN113181878A (en) * | 2021-05-13 | 2021-07-30 | 湖南省林业科学院 | Method for preparing sludge-based biochar through microbubble drying-low-oxygen baking pretreatment |
| CN113413874A (en) * | 2021-07-09 | 2021-09-21 | 湖南省林业科学院 | Method for preparing sludge-based biochar by virtue of drying, coupling and pyrolysis of mixed microbubbles |
| CN113828261A (en) * | 2021-09-02 | 2021-12-24 | 中农新科(苏州)有机循环研究院有限公司 | Heat-preservation temperature-control organic waste biological drying reactor |
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