CN103508651A - Deep sludge dewatering system and method - Google Patents
Deep sludge dewatering system and method Download PDFInfo
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- CN103508651A CN103508651A CN201310412761.3A CN201310412761A CN103508651A CN 103508651 A CN103508651 A CN 103508651A CN 201310412761 A CN201310412761 A CN 201310412761A CN 103508651 A CN103508651 A CN 103508651A
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Abstract
The invention provides a deep sludge dewatering system and a method, and belongs to the technical field of sludge disposal. The deep sludge dewatering system comprises a sludge thickening machine room, a sludge conditioning tank, a sludge dewatering machine room, a sludge incinerator and a fly ash storage bin which are sequentially communicated, wherein the fly ash storage bin is communicated with the sludge conditioning tank. In a deep sludge dewatering method by adopting the deep sludge dewatering system, incineration fly ash serves as a chemical conditioning sludge assistant to be circularly put into the sludge conditioning tank, so that the addition amount of a chemical conditioning sludge agent is reduced; and in addition, active ingredients of the incineration fly ash are fully used, so that harm of emission of the sludge incineration fly ash to an environment and public health is avoided, resource utilization of the sludge incineration fly ash is achieved, and pollution to an external environment in a sludge treatment process is reduced.
Description
Technical field
The present invention relates to Sludge Disposal Techniques field, particularly a kind of deep dehydration system for sludge and method.
Background technology
Sludge dewatering is the most general sludge disposal technology of wastewater treatment in China factory, its utility ratio almost nearly 100%.Moisture percentage in sewage sludge is 80% ~ 85%.Moisture percentage in sewage sludge is now still higher, is metamict, no matter is that stacking, transportation or subsequent disposal are disposed all more difficult.And, owing to not realizing stabilization, also can long-living foul smell, the secondary pollution such as percolate and heavy metal, environment is caused to more serious destruction.
Sludge dewatering refers to primary, the concentrated or digested sludge of fluidised form is removed to moisture, is converted into a kind of method for sludge treatment of semi-solid state or solid-state clod.The key problem of sludge treatment is removing of moisture, i.e. minimizing.The reduction of moisture percentage in sewage sludge of dispatching from the factory has obvious benefit, and traffic capacity and the transportation cost of mud can significantly reduce on the one hand, and the mud of water ratio 80% of take is example, and when water ratio drops to 60%, sludge volume is less than original half; Can greatly simplify subsequent disposal disposing technique on the other hand, reduce sludge disposal cost.Sludge dewatering not only can make sludge quantity significantly cut down, and is also the necessary links being connected with subsequent processes such as Sludge landfill, burning, soil utilizations.
So-called deep dehydration refers to that dehydrated sludge water ratio reaches 55% ~ 65%, and special conditions reaches it with lower horizontal sludge dewatering.Before deep dehydration, reply mud is effectively nursed one's health, and its opsonization mechanism is mainly that the organism on mud granule surface is carried out to modification, reduces the moisture binding capacity of mud; Reduce the compressibility of mud simultaneously, make mud meet the requirement of high pressure dehydration.At present, deep dehydration conditioning technology mainly divides three classes, comprises chemical conditioning, physics conditioning, thermal technology's conditioning.
Wherein, chemical conditioning adds chemical conditioning medicament in the mud of needs dehydration, makes mud granule, comprises tiny particle and colloidal solid cohesion, flocculation, to improve its dewatering.Because chemical conditioning need to add chemical agent in mud, so medicament dissolution, preparation, adding equipment need to be set.Add chemical agent, particularly add after Inorganic chemicals and lime, can cause sewage sludge solid amount to increase, follow-up dehydration and sludge disposal equipment all should correspondingly expand.
Conventionally, for the processing of the mud after dehydration, delivered to refuse landfill to carry out landfill, but because moisture percentage in sewage sludge is high, quality and volume are all very large, while causing landfill, floor space is large, and the heavy metal containing in mud can enter underground water along with percolate, causes groundwater pollution.Therefore, processing for dewatered sludge, the technology of main flow is that dewatered sludge is burned at present, mode by anhydration and incineration can realize sludge reduction and innoxious, the flying dust that sludge incineration produces is conventionally transported to cement mill outward or landfill yard is processed disposal, but the fineness of flying dust is less, need special conveyer, and impact that can be larger on causing of Sewage Plant and surrounding enviroment in the cargo handling process of outward transport.
Summary of the invention
The object of the present invention is to provide a kind of deep dehydration system for sludge and method, to nurse one's health medicament in solution traditional sludge dehydration technique, add the problem that causes the increase of sewage sludge solid amount and sludge incineration flying dust environmental pollution, when reducing the add-on of sludge conditioning medicament, reduce the output of sludge incineration flying dust, realize the recycling of sludge incineration flying dust, thereby reached, reduced the object of sludge handling process to the pollution of environment.
For solving the problems of the technologies described above, the invention provides a kind of deep dehydration system for sludge, comprise the sludge concentrator room, sludge conditioning pond, sludge dewatering machine room, sludge incinerator and the flying dust warehouse that are communicated with successively, wherein, described flying dust warehouse is communicated with described sludge conditioning pond.
Optionally, described flying dust warehouse is communicated with described sludge conditioning pond by a flying dust pump.
Optionally, described flying dust pump is Pneumatic conveying pump.
Optionally, also comprise that the conditioning medicament being connected with described sludge conditioning pond adds throwing device.
Optionally, in described sludge conditioning pond, a whipping appts is set.
Optionally, described whipping appts is turbine type stirring rake.
Optionally, described sludge conditioning pond is connected with described sludge dewatering machine room by a shell pump.
Optionally, the sludge pump that described shell pump is erosion resistance.
Optionally, also comprise the desulfurizer and the fly-ash separator that are communicated with successively, described sludge incinerator is communicated with described desulfurizer, and is communicated with described flying dust storage by described fly-ash separator.
A deep dehydration method for sludge that adopts described deep dehydration system for sludge, comprises the steps:
Step 1: utilize described sludge concentrator room to carry out concentration to the mud entering;
Step 2: the mud after concentration enters described sludge conditioning pond, is transported to described sludge conditioning pond by the flying ash of described flying dust warehouse, and mud is nursed one's health;
Step 3: the mud after conditioning enters described sludge dewatering machine room, carries out sludge dewatering;
Step 4: the mud cake after dehydration enters described sludge incinerator, carries out sludge incineration; And
Step 5: the flying ash after sludge incineration enters described flying dust warehouse, a part of flying ash circulation enters described sludge conditioning pond, and another part flying ash is discharged described deep dehydration system for sludge.
Optionally, in described step 2, by described flying dust pump, the flying ash of described flying dust warehouse is added and throws into described sludge conditioning pond.
Optionally, the throwing amount that adds of described flying ash is 0.05kg/kg ~ 0.1 kg/kg.
Optionally, described step 2 also comprises, adds throwing device to described sludge conditioning pond, add throwing conditioning medicament by described conditioning medicament.
Optionally, described conditioning medicament comprises chemical inorganic metal salt and lime.
Optionally, the throwing amount that adds of described chemical inorganic metal salt is 0.03kg/kg ~ 0.07 kg/kg, and the throwing amount that adds of described lime is 0.2kg/kg ~ 0.5 kg/kg.
Optionally, described step 2 also comprises, adopts described whipping appts to carry out mechanical stirring to the mud in described sludge conditioning pond.
Optionally, the rotating speed of described whipping appts is 60rpm ~ 100rpm.
Deep dehydration system for sludge of the present invention comprises sludge concentrator room, sludge conditioning pond, sludge dewatering machine room, sludge incinerator and the flying dust warehouse being communicated with successively, and wherein said flying dust warehouse is communicated with described sludge conditioning pond.In the flying ash that contriver finds to produce after sludge incineration, contain flue gas desulfurization refuse, thus wherein contain the compositions such as vitriol and calcium oxide, with the constituent class of lime in Sludge Chemical Conditioning medicament seemingly.The present invention has utilized this character of flying ash just, using flying ash as Sludge Chemical Conditioning auxiliary agent, circulate and put in sludge conditioning pond, when having reduced the dosage of Sludge Chemical Conditioning medicament, take full advantage of the effective constituent of flying ash, the harm that the discharge of having avoided sludge incineration flying dust produces environment and public health, realize the recycling of sludge incineration flying dust, reduced the pollution of sludge handling process to outside atmosphere.
Accompanying drawing explanation
Fig. 1 is the structural representation of deep dehydration system for sludge in one embodiment of the invention;
Fig. 2 is the schema of deep dehydration method for sludge in one embodiment of the invention.
Embodiment
The deep dehydration system for sludge and the method that the present invention are proposed below in conjunction with the drawings and specific embodiments are described in further detail.According to the following describes and claims, advantages and features of the invention will be clearer.It should be noted that, accompanying drawing all adopts very the form of simplifying and all uses non-ratio accurately, only in order to convenient, the object of the aid illustration embodiment of the present invention lucidly.
As shown in Figure 1, the deep dehydration system for sludge 100 of one embodiment of the invention comprises successively described in sludge concentrator room 1, sludge conditioning pond 2, sludge dewatering machine room 3, sludge incinerator 4 and the flying dust warehouse 5 being communicated with that flying dust warehouse 5 is communicated with described sludge conditioning pond 2.
Specifically, mud is introduced into sludge concentrator room 1, after preliminary concentrating, enters sludge conditioning pond 2, from flying dust warehouse 5, carries the sludge incineration flying dust of coming also to join sludge conditioning pond 2.Contriver finds that the porosity of sludge incineration flying dust is about 50 % ~ 60 %, and particle diameter is less than 0.06 mm ~ 0.1 mm, and surface-area is larger, has outstanding adsorption bridging effect; In addition, owing to containing flue gas desulfurization refuse in sludge incineration flying dust, therefore wherein contain the compositions such as vitriol and calcium oxide, with the constituent class of Sludge Chemical Conditioning agent lime seemingly.Therefore can utilize its adsorption bridging and the electrically effect of neutralization through sludge incineration flying dust as sludge conditioning auxiliary agent, can destroy the stability of mud colloid, between the small-particle that makes to disperse, assemble and form macrobead mutually, thereby improve the dehydration property of mud.
In said process, sludge incineration flying dust has served as the effect of chemical conditioning auxiliary agent, on the one hand, can greatly reduce the demand of the 2 pairs of chemical conditioning medicaments in sludge conditioning pond, even can not need additionally to add chemical conditioning medicament completely again; On the other hand, also realize the utilization of the resource utilization of sludge incineration flying dust, avoided the harm of flying ash discharge to environment and public health.
In order effectively to control the input of sludge incineration flying dust in sludge conditioning pond 2, can between flying dust warehouse 5 and described sludge conditioning pond 2, a flying dust pump 6 be set, preferred, described flying dust pump 6 is Pneumatic conveying pump.
Continuation is with reference to figure 1, in order further to improve the dehydration property of sludge conditioning pond 2 mud extractions, can increase a conditioning medicament being connected with described sludge conditioning pond 2 and add throwing device 7, when adding the sludge incineration flying dust of throwing the dehydration of mud is improved to poor effect, can add and throw device 7 and to sludge conditioning pond 2, add and throw conditioning medicament by conditioning medicament.
Continuation, with reference to figure 1, in order further to strengthen the conditioning effect in sludge conditioning pond 2, can arrange a whipping appts 8 in sludge conditioning pond 2, and preferred, described whipping appts 8 is turbine type stirring rake.By whipping appts 8, sludge incineration flying dust, conditioning medicament and mud are fully stirred.In Fig. 1, with solid arrow, represent the trend of mud, with dotted arrow, represent the trend of flying ash.
Continuation is with reference to figure 1, and mud enters sludge dewatering machine room 3 after stirring with sludge incineration flying dust and conditioning medicament in sludge conditioning pond 2.In order to improve mud extraction efficiency, can between sludge conditioning pond 2 and described sludge dewatering machine room 3, a shell pump 9 be set, use shell pump 9 that the mud in sludge conditioning pond 2 is transported in sludge dewatering machine room 3.Because the mud after conditioning comprises sludge incineration flying dust and various conditioning medicament, preferred, the sludge pump that shell pump 9 is erosion resistance.
Continuation is with reference to figure 1, the mud after 2 conditionings of sludge conditioning pond, and its dewatering is increased dramatically, and therefore, after the dehydration of sludge dewatering machine room 3, the water ratio of its dehydrated sludge cake can reach 55% ~ 65%, even lower.Mud cake after dehydration enters sludge incinerator 4, after mud cake fully burns in sludge incinerator 4, the flue gas that produces enters a desulfurizer 10 and then enters a fly-ash separator 11, make harmless non-dusting flue gas enter atmosphere by a chimney 12, make sludge incineration flying dust enter flying dust warehouse 5 simultaneously.The a part of sludge incineration flying dust that enters flying dust warehouse 5 is again circulated and enters sludge conditioning pond 2 as sludge conditioning medicament by flying dust pump 6, and another part is discharged system.
Accordingly, the present invention also provides a kind of deep dehydration method for sludge that adopts above-mentioned deep dehydration system for sludge 100.Fig. 2 is the schema of the deep dehydration method for sludge of one embodiment of the invention, describes the deep dehydration method for sludge of one embodiment of the invention below in conjunction with Fig. 2 in detail.
In conjunction with Fig. 1 and Fig. 2, the deep dehydration method for sludge of one embodiment of the invention comprises the steps:
Step 1, mud concentrate: utilize 1 pair, the described sludge concentrator room mud entering to carry out concentration;
Step 2, add throwing flying ash, carry out sludge conditioning: the mud after concentration enters described sludge conditioning pond 2, the flying ash of described flying dust warehouse 5 is transported to described sludge conditioning pond 2, mud is nursed one's health;
Specifically, by described flying dust pump 6, the flying ash of described flying dust warehouse 5 is added and thrown in described sludge conditioning pond 2, preferred, the throwing amount that adds of flying ash is 0.05kg/kg ~ 0.1 kg/kg.The so-called throwing amount that adds refers to, needs the quality of the amendment that adds in every kilogram of band conditioning mud.According to the difference of the sludge components in sludge conditioning pond 2, except adding flying ash as rinse additive, can also add throwing device 7 by described conditioning medicament and to described sludge conditioning pond 2, add throwing conditioning medicament, for example chemical inorganic metal salt and lime.Preferably, the throwing amount that adds of chemical inorganic metal salt is 0.03kg/kg ~ 0.07 kg/kg, and the throwing amount that adds of described lime is 0.2kg/kg ~ 0.5 kg/kg.
For flying ash and conditioning medicament can fully be mixed with the mud in conditioner 2, can adopt in 8 pairs of described sludge conditioning ponds of described whipping appts 2 mud to carry out mechanical stirring.The rotating speed of whipping appts 8 is determined with the solid content of sludge concentrator room 1 mud extraction, and the higher rotating speed of solid content is lower, and preferred, the rotating speed of described whipping appts is 60rpm ~ 100rpm.
Step 3, sludge dewatering: the mud after conditioning enters described sludge dewatering machine room 3, carries out sludge dewatering;
In sludge dewatering machine room 3, arrange by sludge dewatering machinery, such as belt filter press, centrifuge or plate-and-frame filter press etc.Process about sludge dewatering belongs to prior art, does not repeat them here.
Step 4, sludge incineration: the mud cake after dehydration enters described sludge incinerator 4, carries out sludge incineration;
Mud cake after 3 dehydrations of sludge dewatering machine room, enters sludge incinerator 4, and after mud cake fully burns in sludge incinerator 4, the flue gas that produces enters desulfurizer 10 and then entering fly-ash separator 11, makes harmless non-dusting flue gas enter atmosphere by chimney 12.
Step 5, flying ash are processed: the flying ash after sludge incineration enters described flying dust warehouse 5, and a part of flying ash circulation enters described sludge conditioning pond 2, and another part flying ash is discharged described deep dehydration system for sludge 100.
The flying ash that flue gas after mud cake burning produces after fly-ash separator 11 enters flying dust warehouse 5, the a part of sludge incineration flying dust that enters flying dust warehouse 5 is again circulated and enters sludge conditioning pond 2 as sludge conditioning auxiliary agent by flying dust pump 6, and another part is discharged deep dehydration system for sludge 100.
In sum, deep dehydration system for sludge of the present invention comprises sludge concentrator room, sludge conditioning pond, sludge dewatering machine room, sludge incinerator and the flying dust warehouse being communicated with successively, and wherein said flying dust warehouse is communicated with described sludge conditioning pond.The present invention has utilized character like the constituent class of the lime in flying ash and Sludge Chemical Conditioning medicament cleverly, using flying ash as Sludge Chemical Conditioning auxiliary agent, circulate and put in sludge conditioning pond, when having reduced the dosage of Sludge Chemical Conditioning medicament, take full advantage of the effective constituent of flying ash, the harm that the discharge of having avoided sludge incineration flying dust produces environment and public health, realize the recycling of sludge incineration flying dust, reduced the pollution of sludge handling process to outside atmosphere.
Foregoing description is only the description to preferred embodiment of the present invention, the not any restriction to the scope of the invention, and any change, modification that the those of ordinary skill in field of the present invention is done according to above-mentioned disclosure, all belong to the protection domain of claims.
Claims (17)
1. a deep dehydration system for sludge, comprises the sludge concentrator room, sludge conditioning pond, sludge dewatering machine room, sludge incinerator and the flying dust warehouse that are communicated with successively, it is characterized in that, described flying dust warehouse is communicated with described sludge conditioning pond.
2. deep dehydration system for sludge as claimed in claim 1, is characterized in that, described flying dust warehouse is communicated with described sludge conditioning pond by a flying dust pump.
3. deep dehydration system for sludge as claimed in claim 2, is characterized in that, described flying dust pump is Pneumatic conveying pump.
4. deep dehydration system for sludge as claimed in claim 1, is characterized in that, also comprises that the conditioning medicament being connected with described sludge conditioning pond adds throwing device.
5. the deep dehydration system for sludge as described in claim 1 or 4, is characterized in that, described sludge conditioning arranges a whipping appts in pond.
6. deep dehydration system for sludge as claimed in claim 5, is characterized in that, described whipping appts is turbine type stirring rake.
7. deep dehydration system for sludge as claimed in claim 1, is characterized in that, described sludge conditioning pond is connected with described sludge dewatering machine room by a shell pump.
8. deep dehydration system for sludge as claimed in claim 1, is characterized in that, the sludge pump that described shell pump is erosion resistance.
9. deep dehydration system for sludge as claimed in claim 1, is characterized in that, also comprises the desulfurizer and the fly-ash separator that are communicated with successively, and described sludge incinerator is communicated with described desulfurizer, and is communicated with described flying dust storage by described fly-ash separator.
10. adopt a deep dehydration method for sludge for deep dehydration system for sludge as claimed in any one of claims 1-9 wherein, it is characterized in that, comprise the steps:
Step 1: utilize described sludge concentrator room to carry out concentration to the mud entering;
Step 2: the mud after concentration enters described sludge conditioning pond, is transported to described sludge conditioning pond by the flying ash of described flying dust warehouse, and mud is nursed one's health;
Step 3: the mud after conditioning enters described sludge dewatering machine room, carries out sludge dewatering;
Step 4: the mud cake after dehydration enters described sludge incinerator, carries out sludge incineration; And
Step 5: the flying ash after sludge incineration enters described flying dust warehouse, a part of flying ash circulation enters described sludge conditioning pond, and another part flying ash is discharged described deep dehydration system for sludge.
11. deep dehydration method for sludge as claimed in claim 10, is characterized in that, in described step 2, by described flying dust pump, the flying ash of described flying dust warehouse are added and throw into described sludge conditioning pond.
12. deep dehydration method for sludge as claimed in claim 11, is characterized in that, the throwing amount that adds of described flying ash is 0.05kg/kg ~ 0.1 kg/kg.
13. deep dehydration method for sludge as claimed in claim 10, is characterized in that, described step 2 also comprises, adds throwing device to described sludge conditioning pond, add throwing conditioning medicament by described conditioning medicament.
14. deep dehydration method for sludge as claimed in claim 13, is characterized in that, described conditioning medicament comprises chemical inorganic metal salt and lime.
15. deep dehydration method for sludge as claimed in claim 14, is characterized in that, the throwing amount that adds of described chemical inorganic metal salt is 0.03kg/kg ~ 0.07 kg/kg, and the throwing amount that adds of described lime is 0.2kg/kg ~ 0.5 kg/kg.
16. deep dehydration method for sludge as described in claim 10 or 13, is characterized in that, described step 2 also comprises, adopts described whipping appts to carry out mechanical stirring to the mud in described sludge conditioning pond.
17. deep dehydration method for sludge as claimed in claim 16, is characterized in that, the rotating speed of described whipping appts is 60rpm ~ 100rpm.
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| CN201310412761.3A CN103508651B (en) | 2013-09-12 | 2013-09-12 | Deep sludge dewatering system and method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105217905A (en) * | 2015-09-30 | 2016-01-06 | 王立鹏 | The combined modified flyash of gamma-rays cracks the method for excess sludge |
| CN107973141A (en) * | 2017-09-29 | 2018-05-01 | 上海市政工程设计研究总院（集团）有限公司 | A kind of method for semi-dry sludge storage silo export |
| CN117534193A (en) * | 2024-01-10 | 2024-02-09 | 浙江浙能兴源节能科技有限公司 | Method for recycling wastewater in sludge drying incineration plant |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090396A (en) * | 2012-12-06 | 2013-05-08 | 上海金自天正信息技术有限公司 | Two-stage drying and incineration method for sludge |
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2013
- 2013-09-12 CN CN201310412761.3A patent/CN103508651B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090396A (en) * | 2012-12-06 | 2013-05-08 | 上海金自天正信息技术有限公司 | Two-stage drying and incineration method for sludge |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105217905A (en) * | 2015-09-30 | 2016-01-06 | 王立鹏 | The combined modified flyash of gamma-rays cracks the method for excess sludge |
| CN107973141A (en) * | 2017-09-29 | 2018-05-01 | 上海市政工程设计研究总院（集团）有限公司 | A kind of method for semi-dry sludge storage silo export |
| CN107973141B (en) * | 2017-09-29 | 2023-05-30 | 上海市政工程设计研究总院（集团）有限公司 | Method for discharging semi-dry sludge storage bin |
| CN117534193A (en) * | 2024-01-10 | 2024-02-09 | 浙江浙能兴源节能科技有限公司 | Method for recycling wastewater in sludge drying incineration plant |
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