CN106630538A - Sludge drying method - Google Patents
Sludge drying method Download PDFInfo
- Publication number
- CN106630538A CN106630538A CN201710035147.8A CN201710035147A CN106630538A CN 106630538 A CN106630538 A CN 106630538A CN 201710035147 A CN201710035147 A CN 201710035147A CN 106630538 A CN106630538 A CN 106630538A
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- China
- Prior art keywords
- sludge
- drying method
- steam
- filter
- drier
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides a sludge drying method. The sludge drying method comprises the following steps: extruding sludge into a sludge forming machine to form a strip-shaped raw material; feeding the strip-shaped raw material into a drying device, heating the drying device with steam, and stirring to obtain a solid-liquid mixture; feeding the solid-liquid mixture into a filtering machine for filtering through a filter pump to form a filter cake; emptying the filtering machine and blowing the filter cake by using the steam to obtain dried sludge. Compared with the prior art, the dried sludge is subjected to solid-liquid separation through filtering by adopting the method which is provided by the invention; a dewatering agent is recycled and reused; the sludge is further subjected to water reduction and amount reduction, and can be directly subjected to incineration treatment without mixing other fuels for burning.
Description
Technical field
The present invention relates to a kind of drying method for sludge, particularly a kind of to carry out chemical dehydration with heat transfer using dehydrating agent
Dry method.
Background technology
Mechanical dehydration sludge is a kind of solid waste that all can be produced in industrial production and municipal wastewater processing procedure,
Need further to carry out decrement and harmless treatment.Industry generally acknowledges that burning is the further decrement of mechanical dehydration sludge and innoxious place
Reason most thoroughly method.But, the moisture percentage in sewage sludge after mechanical dehydration is still higher, and burning process moisture evaporation absorbs big calorimetric
Amount, reduces the other problemses such as incinerator ignition temperature, flue gas containing water vapor, thus must be burnt using special incinerator
Burn, cause sludge incineration intractability high, therefore need to first carry out dried process to mechanical dehydration sludge.
Interstitial Water that the moisture contained in sludge generally includes to be present between mud granule, absorption particle surface suction
Attached water, the capillary being present in the wedge capillary of particle surface are with reference to water and are present in the inside of particle or cell interior
Water.
Traditional drying method for sludge typically adopts following form：
1. high-pressure filteration method
By the way that water-containing sludge is sent into plate and frame type filter-press, high-pressure filteration is carried out, be aided with steam heating.The method typically may be used
So that the water content in sludge is dropped into 30%～50% or so.Such sludge is still not suitable for directly being burned, and needs and it
He mixes by a certain percentage burning by fuel.
2. oven drying method
Mechanical dehydration sludge is heated by thermals source such as hot blast, high-temperature flue gas, steam.The method can remove sludge
In Interstitial Water, absorption water, capillary combine water, but internal water cannot be removed, generally the water content in sludge can be declined
To 10%～30% or so.Time-consuming and atmospheric operation for the technique, and stink substance and dust easily form secondary pollution, dried
Sludge calorific value is relatively low, it is difficult to burn, and need to by a certain percentage mix burning with other fuel.
3. fried method
Patent CN102701559A discloses a kind of method of use kitchen waste oil disposal sludge, including sludge shaping, fried
It is dried, burns heat exchange, vent gas treatment, slag charge collecting processes.The method atmospheric operation, for reach preferable drying effect and compared with
Short drying time, treatment temperature need to be improved, too high temperature causes the organic matter in waste oil and sludge that side reaction occurs, formed
The volatile matters such as short carbon chain aldehyde ketone, form secondary pollution, and the excessive denaturation of the organic matter in another aspect sludge causes subsequent filter
Difficulty, waste oil consumes high.
For the problem that prior art is present, the present invention relates to a kind of drying method for sludge, particularly a kind of to adopt
Dehydrating agent carries out the chemical dehydration method dry with heat transfer.Specifically, it is exactly the mechanical dehydration that will produce in waste water treatment process
Sludge in sludge dryer, carries out chemical dehydration dry with heat transfer under condition of negative pressure with heated dehydrating agent directly contact
Dry, dried sludge Jing is filtered carries out separation of solid and liquid, dehydrating agent circulating and recovering, the further diminishing decrement of sludge, and can be direct
Burning disposal is carried out, without the need for mixing other fuel are burnt.
The content of the invention
For defect of the prior art, present invention aim at providing a kind of drying sludge for solving above-mentioned technical problem
Method.
The present invention provides a kind of drying method for sludge, comprises the steps：
The first step, by sludge sludge forming machine is squeezed into, and forms stripe shape raw material；
Second step, stripe shape raw material is sent into drier, is stirred in drier and the heating of Jing steam, obtains solid-liquid
Mixture；
3rd step, solidliquid mixture is pumped into filter by filtration and is filtered, and forms filter cake；
4th step, empties filter, and with steam filter cake is blown, and obtains being dried sludge.
The drying method for sludge of the present invention, it is preferable that in the second step, by sludge the drying equipped with dehydrating agent is entered
In device, sludge is 1%-4% with the percentage by weight of dehydrating agent.
The drying method for sludge of the present invention, it is preferable that in the second step, added dehydrating agent with steam in drier
Heat is to 100 DEG C～120 DEG C.
The drying method for sludge of the present invention, it is preferable that in the second step, the steam consumption being passed through is dehydration cycle agent
Percentage by weight 0.1%～1%.
Compared with prior art, the present invention has advantages below：Without dust generation, efficiency high, baking temperature is low, be dried when
Between it is short, be capable of achieving continuous production；The volatile materials produced in dry run is directly entered at waste water Jing after vacuum system condensation
Reason, minimal amount of incoagulable gas can be focused on from after the discharge of Water-ring vacuum pump exhaust inlet.Sludge can be burned directly after drying,
Need not mix and burn other fuel.
Description of the drawings
Fig. 1 is drying method for sludge technological process of the present invention and corresponding device schematic diagram
Specific embodiment
With reference to specific embodiment, the present invention is described in detail.Following examples will be helpful to the technology of this area
Personnel further understand the present invention, but the invention is not limited in any way.
Embodiment 1：As shown in figure 1, in the present embodiment, drying method for sludge includes：
The first step, with screw pump 1 by sludge propulsion sludge forming machine 2, forms stripe shape raw material.Sludge can come from petrochemical industry,
The industries such as papermaking, pharmacy and municipal administration.In the present embodiment, handled sludge is the pharmacy sludge of moisture content 80%.
Second step, is sent into the bar stock in sludge forming machine 2 in drier 4, in drier by raw material transport pump 3
Equipped with circulation liquid-phase dehydration agent, sludge is 1%-4% with the percentage by weight of dehydrating agent.With steam heat drier 4, liquid phase takes off
Aqua temperature is increased to 102 DEG C, and the steam consumption being passed through is 0.2% with the percentage by weight of circulation liquid-phase dehydration agent, is stirred
Mix.After drying, solidliquid mixture is obtained.
Condensed into the second condenser 9 from the waste vapour out of drier 4, afterwards into condensate water pot 11.Second is cold
Condenser 9 adopt shell and tube surface condenser, condenser cooling water therein can adopt process after can qualified discharge waste water；Also may be used
Using mixing condenser, now condenser cooling water can be using the waste water of before processing.
Liquid-phase dehydration agent can be using anion surfactant and higher boiling low volatility oils material.Wherein anion table
Face activating agent can adopt lignosulfonates (calcium salt, magnesium salts, sodium salt), modified lignin mahogany sulfonate, kraft lignin, alkali lignin
Deng.Higher boiling low volatility oils material can select the high boiling point low-volatile oils such as animal oil, vegetable oil, lubricating oil, fuel oil
Product and their discarded object.
In the present embodiment, the liquid-phase dehydration agent is sodium lignin sulfonate and paraffin oil mixture, sodium lignin sulfonate with
The weight ratio of paraffin oil is 2:8.
3rd step, the solidliquid mixture obtained after drying is sent into filter 6 by filter pump 5, enters in filter 6
Row is filtered, and forms filter cake.
4th step, after the filter cake in filter 6 reaches certain thickness, empties filter, blows filter cake with steam and blows filter cake
Steam pressure control in 3barG.Filter is carried out into removal filter cake and deslagging, obtains being dried sludge.
Filter pump 5 adopts centrifugal pump with open impellerpump to avoid blocking.Filter 6 adopts leaf filter, can pass through
PLC control realization automatic fitrations, automatic tank switching, automatic cake discharging.
Blow the steam of filter cake carries out separation drop into suspension separator 7, is condensed into the first condenser 8 afterwards,
Gained condensed water enters condensate water pot 11.The condensed water Jing water pumps 12 of condensate water pot 11 send sewage treatment plant to be processed.
In the present embodiment, by GB24188-2009《Urban wastewater treatment firm sludge shale》Regulation determine sludge it is aqueous
Rate；By GB/T213-2008《The heat output determining method of coal》Regulation determine be dried after sludge calorific value.In the present embodiment, survey
The water content that sludge must be dried is 3%, measures calorific value for 3500kcal/kg.
For the waste gas formed in sludge dehydration process, after unified collection uniform effluent after catalytic oxidation treatment is carried out.
Embodiment 2：As shown in figure 1, in the present embodiment, the basic step of drying sludge is identical with implementing 1.
In the present embodiment, liquid-phase dehydration agent is modified sodium lignosulfonate and discarded cold rolling oil mixture, modified lignin resin
Sodium sulfonate is 1 with the weight ratio of discarded cold-rolled lubricating oil:9.Handled sludge is the paper mill sludge of moisture content 60%.In second step
In, the temperature of liquid-phase dehydration agent is heated to 115 DEG C, and the steam consumption being passed through is with the percentage by weight of circulation liquid-phase dehydration agent
0.1%.What is finally obtained is dried sludge, uses GB24188-2009 methods, and it is 1.2% to measure sludge moisture content, uses GB/T213-
2008 methods, measure calorific value for 3850kcal/kg.
Embodiment 3：As shown in figure 1, in the present embodiment, the basic step of drying sludge is identical with implementing 1.
In the present embodiment, liquid-phase dehydration agent is magnesium lignosulfonate and soya-bean oil mixture, and magnesium lignosulfonate is mixed with soya-bean oil
The weight ratio of compound is 3:7, handled sludge is the refinery sludge of moisture content 50%.In second step, liquid-phase dehydration agent
Temperature is heated to 115 DEG C, and it is the percentage by weight 0.3% for circulating liquid-phase dehydration agent to be passed through steam consumption.In the third step, will be dry
Solidliquid mixture after dry is sent into when being filtered in filter 6 by filter pump 5, after solidliquid mixture adds diatomite again
Filtered, the diatomite of addition is the 1% of solidliquid mixture percentage by weight.What is finally obtained is dried sludge, uses
GB24188-2009 methods, it is 1.8% to measure sludge moisture content, uses GB/T213-2008 methods, measures calorific value for 4200kcal/
kg。
Drying method for sludge in the above embodiment of the present invention, with following technical advantage：Without dust generation, efficiency high,
Baking temperature is low, drying time is short, is capable of achieving continuous production；The volatile materials Jing vacuum systems condensation produced in dry run
After be directly entered wastewater treatment, minimal amount of incoagulable gas can be focused on from after the discharge of Water-ring vacuum pump exhaust inlet.It is dried
Afterwards sludge can be burned directly, and without the need for mixing other fuel are burnt.
The specific embodiment of the present invention is described above.It should be noted that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can within the scope of the claims make a variety of changes or change, this not shadow
Ring the flesh and blood of the present invention.In the case where not conflicting, the feature in embodiments herein and embodiment can any phase
Mutually combination.
Claims (4)
1. a kind of drying method for sludge, it is characterised in that comprise the steps：
The first step, by sludge sludge forming machine is squeezed into, and forms stripe shape raw material；
Second step, stripe shape raw material is sent into drier, uses steam heat drier, and is stirred, and obtains solidliquid mixture；
3rd step, solidliquid mixture is pumped into filter by filtration and is filtered, and forms filter cake；
4th step, empties filter, and with steam filter cake is blown, and obtains being dried sludge.
2. drying method for sludge according to claim 1, it is characterised in that in the second step, sludge is sent into and is equipped with
In the drier of dehydrating agent, sludge is 1%-4% with the percentage by weight of dehydrating agent.
3. drying method for sludge according to claim 1, it is characterised in that in the second step, drier will with steam
Dehydrating agent is heated to 100 DEG C～120 DEG C.
4. drying method for sludge according to claim 1, it is characterised in that in the second step, the steam consumption being passed through
With the percentage by weight 0.1%～1% of dehydration cycle agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710035147.8A CN106630538A (en) | 2017-01-17 | 2017-01-17 | Sludge drying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710035147.8A CN106630538A (en) | 2017-01-17 | 2017-01-17 | Sludge drying method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106630538A true CN106630538A (en) | 2017-05-10 |
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ID=58840638
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710035147.8A Withdrawn CN106630538A (en) | 2017-01-17 | 2017-01-17 | Sludge drying method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102260033A (en) * | 2011-06-30 | 2011-11-30 | 杭州电子科技大学 | Multi-stage drying method of sludge utilizing compressed secondary steam |
| CN102276131A (en) * | 2011-06-30 | 2011-12-14 | 杭州电子科技大学 | Secondary steam compressed drying method of sludge |
| CN103570200A (en) * | 2012-08-06 | 2014-02-12 | 吴俊斌 | Sludge liquefying and drying treatment system and method |
-
2017
- 2017-01-17 CN CN201710035147.8A patent/CN106630538A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102260033A (en) * | 2011-06-30 | 2011-11-30 | 杭州电子科技大学 | Multi-stage drying method of sludge utilizing compressed secondary steam |
| CN102276131A (en) * | 2011-06-30 | 2011-12-14 | 杭州电子科技大学 | Secondary steam compressed drying method of sludge |
| CN103570200A (en) * | 2012-08-06 | 2014-02-12 | 吴俊斌 | Sludge liquefying and drying treatment system and method |
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| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20170510 |
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