CN103482840A - Sludge film precoating and dehydrating technology and equipment - Google Patents
Sludge film precoating and dehydrating technology and equipment Download PDFInfo
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- CN103482840A CN103482840A CN201310435084.7A CN201310435084A CN103482840A CN 103482840 A CN103482840 A CN 103482840A CN 201310435084 A CN201310435084 A CN 201310435084A CN 103482840 A CN103482840 A CN 103482840A
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Abstract
The invention discloses a sludge film precoating and dehydrating technology, which includes the following steps: firstly forming a layer of a filter aid film with the thickness of 1-3 mm on the surface of filter cloth of a filter press, and then dehydrating sludge through the filter press. The invention further discloses sludge film precoating and dehydrating equipment adopting the technology, which includes the filter press, wherein a discharge control valve is mounted at each filtrate outlet on a filter plate of the filter press; a filter aid turbid liquid inlet system connected in parallel with a sludge inlet system is arranged on the sludge inlet of the filter press. Compared with the prior art, the invention has the following advantages: the filter aid film can be used for adsorbing and separating the sludge, prevent sludge particles from entering the inside of the filter cloth and reduce sludge particles entering the inside of the filter cloth, reduce pollution degree of sludge to the filter cloth, and prolong the cleaning period of the filter cloth; on the other hand, the pre-coated filter aid film can reduce dehydration specific resistance of the sludge, guarantees an excellent outlet passage, improves the dehydration capability of the sludge, and reduces the moisture content of dehydrated mud cakes by 3-8% compared with the prior art.
Description
Technical field
The invention belongs to sewage, field of sludge treatment, particularly a kind of mud pre-coating film dewatering process and equipment.
Background technology
The key problem of sludge treatment is removing of moisture, i.e. the minimizing of mud.At present, sewage work mostly adopt polyacrylamide modified+dewatering technology of mud of belt or centrifugal drier dehydration, moisture percentage in sewage sludge is 80%～85%.
In " about strengthening the notice of urban wastewater treatment firm mud prevention and cure of pollution work " (ring is done [2010] No. 157) of issue in Environmental Protection Department general office on November 26th, 2010 " sewage work take storage (not processing disposal) and mud transported to factory circle as purpose, must by sludge dewatering to water ratio below 50% " of regulation." urban wastewater treatment firm sludge disposal mixing landfill shale " (GB/T23485-2009) requirement that firmly section of building prints and distributes, mud is used as while mixing landfill, water ratio must not be higher than 60%, and during as refuse landfill overburden soil addition material, moisture percentage in sewage sludge must not be higher than 45%.In order to meet the requirements at the higher level of country to the mud low-water-content, domestic sewage work comes into effect the deeply dehydrating sludge engineering gradually, mainly adopts the technique of mud chemical conditioning+Chamber Type Diaphragm Filter Press dehydration, and after deep dehydration, moisture percentage in sewage sludge is 50%～60%.Along with the operation of sludge dewatering system, mud can enter into the inner filter cloth duct of stopping up of filter cloth, makes the moisture in mud unimpededly to flow out, and therefore, must often to filter cloth, be cleaned.
Summary of the invention
The present invention provides a kind of mud pre-coating film dewatering process and equipment that can extend the canvas press cloth cleaning interval for solving the technical problem existed in known technology.
The technical scheme that the present invention takes for the technical problem existed in the solution known technology is: a kind of mud pre-coating film dewatering process first forms the flocculating aids film of one deck 1～3mm on the filter cloth surface of pressure filter, then carries out sludge dewatering with pressure filter.
The formation method of flocculating aids film is: at first a control valve is respectively installed in all filtrate flows exit on filter press filter board; Then the even suspension liquid of the flocculating aids that is 0.1%～2% by mass concentration pumps into the filter chamber of pressure filter, unlatching by controlling control valve or close, control the take-off rate of filtrate, make flocculating aids evenly be attached to the filter cloth surface, and form the flocculating aids film of one deck 1～3mm.
Another technical scheme that the present invention takes for the technical problem existed in the solution known technology is: a kind of mud pre-coating film dehydration equipment of realizing above-mentioned technique, comprise pressure filter, all filtrate flows exit on described filter press filter board is respectively installed one and is gone out hydraulic control valve, and the mud inlet of described pressure filter is provided with the flocculating aids suspension liquid feed liquor system in parallel with advancing the mud system.
Described flocculating aids suspension liquid feed liquor system comprises the liquid-inlet pipe be connected with the mud inlet of described pressure filter, the flocculating aids fresh feed pump be connected with described liquid-inlet pipe and the flocculating aids preparing tank be connected by pipeline with described fresh feed pump, be provided with agitator in described flocculating aids preparing tank, described liquid-inlet pipe is provided with liquid inlet control valve.
Described pressure filter is Chamber Type Diaphragm Filter Press.
Advantage and positively effect that the present invention has are: before adopting pressure filter to carry out sludge dewatering, form one deck flocculating aids film on the filter cloth surface of pressure filter, with existing technique, compare, the effect that the flocculating aids film has absorption and intercepts mud, can prevent from entering filter cloth inside with the reduce mud particle, reduce the pollution level of mud to filter cloth, extend the cleaning interval of filter cloth; Can reduce the sludge dewatering resistivity by the pre-coated filter aid agent film on the other hand, guarantee good water exit, improve the water separation capability of mud, existing technique can reduce by 3～8 percentage points of the water ratio of dehydrated sludge cake.
The accompanying drawing explanation
Fig. 1 is the structural representation of a kind of mud pre-coating film of the present invention dehydration equipment;
Fig. 2 is the pressure filter filtrate flow export structure schematic diagram of a kind of mud pre-coating film of the present invention dehydration equipment.
In figure: 1, flocculating aids preparing tank, 2, agitator, 3, the flocculating aids fresh feed pump, 4, liquid inlet control valve, 5, Chamber Type Diaphragm Filter Press, 6, advance the mud control valve, 7, advance the mud system, 8, go out hydraulic control valve.
Embodiment
For further understanding summary of the invention of the present invention, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows:
Refer to Fig. 1～Fig. 2, a kind of mud pre-coating film dewatering process, first form the flocculating aids film of one deck 1～3mm on the filter cloth surface of pressure filter, then carry out sludge dewatering with pressure filter.
In the present embodiment, in order to facilitate the coating of flocculating aids, enhance productivity, the formation method of flocculating aids film is: at first a control valve 8 is respectively installed in all filtrate flows exit on filter press filter board; Then the even suspension liquid of the flocculating aids that is 0.1%～2% by mass concentration pumps into the filter chamber of pressure filter, unlatching by controlling control valve 8 or close, control the take-off rate of filtrate, make flocculating aids evenly be attached to the filter cloth surface, and form the flocculating aids film of one deck 1～3mm.
A kind of mud pre-coating film dehydration equipment of realizing above-mentioned technique, comprise pressure filter, all filtrate flows exit on described filter press filter board is respectively installed one and is gone out hydraulic control valve 8, and the mud inlet of described pressure filter is provided with the flocculating aids suspension liquid feed liquor system in parallel with advancing mud system 7.
In the present embodiment, in order to facilitate the coating of flocculating aids, enhance productivity, described flocculating aids suspension liquid feed liquor system comprises the liquid-inlet pipe be connected with the mud inlet of described pressure filter, the flocculating aids fresh feed pump 3 be connected with described liquid-inlet pipe and the flocculating aids preparing tank 1 be connected by pipeline with described fresh feed pump 3, be provided with agitator 2 in described flocculating aids preparing tank 1, described liquid-inlet pipe is provided with liquid inlet control valve 4.In the present embodiment, in order to improve the dehydration rate of mud, described pressure filter adopts Chamber Type Diaphragm Filter Press 5.
The step that adopts above-mentioned dehydration equipment to implement the flocculating aids precoating is:
1) configuration flocculating aids suspension liquid, the ratio that is 0.1%～2% according to mass concentration by flocculating aids is mixed with water;
2) pre-coating film, turn on agitator 1, control mixing speed, guarantee that flocculating aids is suspended in water uniformly, open flocculating aids fresh feed pump 3, the flocculating aids suspension liquid is pumped in Chamber Type Diaphragm Filter Press 5, that closes two filtrate flow exits, filter press filter board bottom goes out hydraulic control valve 8, two filtrate flow exits of simultaneously opening filter press filter board top go out hydraulic control valve 8, make filtrate two outlet outflows from first top.Then, that opens two filtrate flow exits, filter press filter board bottom goes out hydraulic control valve 8, proceeds the pre-coating film operation, until the flocculating aids suspension liquid all is pumped in pressure filter, to going out the control of hydraulic control valve 8, to realize flocculating aids, evenly is applied to principle.
After pre-coating film completes, open into advancing mud control valve 6 on mud system 7, adopt Chamber Type Diaphragm Filter Press 5 to carry out sludge dewatering.Need to complete successively into operations such as mud, squeezing, blowback, cake discharges, finally obtain dehydrated sludge cake.
Above-mentioned flocculating aids can be any one in the flocculating aidss commonly used such as flyash, diatomite, kaolin and Powdered Activated Carbon.
Although the above is described the preferred embodiments of the present invention by reference to the accompanying drawings; but the present invention is not limited to above-mentioned embodiment; above-mentioned embodiment is only schematic; be not restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not breaking away from the scope situation that aim of the present invention and claim protect, can also make a lot of forms, within these all belong to protection scope of the present invention.
Claims (5)
1. a mud pre-coating film dewatering process, is characterized in that, first on the filter cloth surface of pressure filter, forms the flocculating aids film of one deck 1～3mm, then carry out sludge dewatering with pressure filter.
2. mud pre-coating film dewatering process according to claim 1, is characterized in that, the formation method of flocculating aids film is: at first a control valve is respectively installed in all filtrate flows exit on filter press filter board; Then the even suspension liquid of the flocculating aids that is 0.1%～2% by mass concentration pumps into the filter chamber of pressure filter, unlatching by controlling control valve or close, control the take-off rate of filtrate, make flocculating aids evenly be attached to the filter cloth surface, and form the flocculating aids film of one deck 1～3mm.
3. a realization is as the mud pre-coating film dehydration equipment of technique as described in claim 1 or claim 2, it is characterized in that, comprise pressure filter, all filtrate flows exit on described filter press filter board is respectively installed one and is gone out hydraulic control valve, and the mud inlet of described pressure filter is provided with the flocculating aids suspension liquid feed liquor system in parallel with advancing the mud system.
4. mud pre-coating film dehydration equipment according to claim 3, it is characterized in that, described flocculating aids suspension liquid feed liquor system comprises the liquid-inlet pipe be connected with the mud inlet of described pressure filter, the flocculating aids fresh feed pump be connected with described liquid-inlet pipe and the flocculating aids preparing tank be connected by pipeline with described fresh feed pump, be provided with agitator in described flocculating aids preparing tank, described liquid-inlet pipe is provided with liquid inlet control valve.
5. mud pre-coating film dehydration equipment according to claim 3, is characterized in that, described pressure filter is Chamber Type Diaphragm Filter Press.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310435084.7A CN103482840A (en) | 2013-09-22 | 2013-09-22 | Sludge film precoating and dehydrating technology and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310435084.7A CN103482840A (en) | 2013-09-22 | 2013-09-22 | Sludge film precoating and dehydrating technology and equipment |
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| CN103482840A true CN103482840A (en) | 2014-01-01 |
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| CN201310435084.7A Pending CN103482840A (en) | 2013-09-22 | 2013-09-22 | Sludge film precoating and dehydrating technology and equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104529127A (en) * | 2014-12-31 | 2015-04-22 | 梁毅 | Sludge dewatering method for coating plate-and-frame filter press with filter aid medium in advance |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101139123A (en) * | 2007-08-06 | 2008-03-12 | 江苏省农业科学院 | Water bloom blue algae dewatering method |
| CN201076785Y (en) * | 2007-06-18 | 2008-06-25 | 中芯国际集成电路制造(上海)有限公司 | Filter press and filter press filter plate |
| CN103272433A (en) * | 2012-11-23 | 2013-09-04 | 昆明冶研新材料股份有限公司 | Treatment for filtering and purifying siliceous powder waste water |
| CN203568951U (en) * | 2013-09-22 | 2014-04-30 | 天津中材工程研究中心有限公司 | Sludge pre-coating dehydration equipment |
-
2013
- 2013-09-22 CN CN201310435084.7A patent/CN103482840A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201076785Y (en) * | 2007-06-18 | 2008-06-25 | 中芯国际集成电路制造(上海)有限公司 | Filter press and filter press filter plate |
| CN101139123A (en) * | 2007-08-06 | 2008-03-12 | 江苏省农业科学院 | Water bloom blue algae dewatering method |
| CN103272433A (en) * | 2012-11-23 | 2013-09-04 | 昆明冶研新材料股份有限公司 | Treatment for filtering and purifying siliceous powder waste water |
| CN203568951U (en) * | 2013-09-22 | 2014-04-30 | 天津中材工程研究中心有限公司 | Sludge pre-coating dehydration equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104529127A (en) * | 2014-12-31 | 2015-04-22 | 梁毅 | Sludge dewatering method for coating plate-and-frame filter press with filter aid medium in advance |
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Application publication date: 20140101 |