CN109734269A - A kind of stage improvement method improving the saturating dewatering of sludge electroosmotic - Google Patents
A kind of stage improvement method improving the saturating dewatering of sludge electroosmotic Download PDFInfo
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Abstract
The invention discloses a kind of stage improvement methods for improving the saturating dewatering of sludge electroosmotic, belong to Treatment of Sludge and resource technology field.The present invention carries out flocculation conditioning to the thickened sludge of sewage plant moisture content 95%-97% first, most Free waters in removal sludge are handled by mechanical dehydration, then improve dewatered sludge electroosmotic dewatering performance using the stage improvement method of biological wall breaking and physical modification, realize deeply dehydrating sludge.A kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic of the present invention the utility model has the advantages that stage improvement makes sludge characteristics meet electroosmotic dewatering requirement, dehydration efficiency is high, and minimizing is obvious；Biological wall breaking agent can be biodegradable, and subsequent sludge treatment requirement is met after dehydration, without secondary pollution；Electro-osmosis, which can consume energy, to be acted on sludge dewatering completely and effectively kills pathogenic microorganism, energy conservation and environmental protection.
Description
Technical field
The present invention relates to sludge hardening and tempering method more particularly to a kind of stage improvement sides for improving the saturating dewatering of sludge electroosmotic
Method.
Background technique
Moisture content is the bottleneck for restricting Treatment of Sludge, and the sludge of high-moisture percentage is not only bulky, but also having contained by it
Machine matter, heavy metal make sludge be in unsteady state, and can be discharged into environment can cause secondary pollution, to it is subsequent landfill, burn,
Resource utilization etc. adversely affects.Therefore, deeply dehydrating sludge minimizing is Treatment of Sludge primary and foremost purpose, and minimizing is
Realize the basis of sludge other " three change ", sludge is more dry, disposes to subsequent processing more advantageous.Contain 4 kinds of form moisture in sludge,
That is Free water, absorption water, capillary water and internal water.Although absorption water, capillary water and internal water only account for the fraction of sludge water content,
But the quality of the far super dewatered sludge of its total content, is not easy to remove using conventional method.Sludge flocculation structure is to influence sludge dewatering
Principal element, it mainly wraps up the suspended particulate in absorption water by the extracellular polymeric of high degree of hydration (EPS) and is formed, and has spy
Different double electrical layers, so that sludge settling property and dewatering are poor.Realize the deep dehydration of sludge, it is necessary to destroy dirty
The special flocculation structure of mud discharges bound moisture, weakens Sludge Surface hydrophily.Electroosmotic dewatering technology is exactly using dirty
Double electrical layers existing for mud and realize dehydration, mud granule is negatively charged, and polar water is positively charged, electric field force effect under, band
The mud granule of negative electricity is moved toward anode plate, and positively charged hydrone is moved toward cathode plate.
Electroosmotic dewatering technology is a kind of novel sludge dewatering technology, it has solid-liquid separation technique and sludge itself
The physical chemistry processing techniques of electrochemical properties be organically combined together, be dehydrated using " electric power ", machinery can be removed
The moisture that technique cannot deviate from.But existing electroosmotic dewatering method only does at simple mechanical dehydration the sludge of high-moisture percentage
Reason, due to the variation of sludge quality and the influence of other factors, sludge is extremely difficult to electroosmotic dewatering requirement without stage improvement,
The unstability for causing electro-osmosis de-, dehydration efficiency is low and energy consumption is big.
Summary of the invention
Goal of the invention: for defect existing for the saturating processing technique of existing sludge electroosmotic, the object of the present invention is to provide one kind
It can effectively realize sludge dewatering high efficiency, the method for minimizing and recycling treatment, sludge is through excessive in this method treatment process
After grade is quenched, dewatering is good, and dehydration efficiency is high, and operating cost is low, and controllability is strong, energy conservation and environmental protection.In order to realize above-mentioned technology
Purpose, the present invention provide a kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic.
A kind of technical solution: stage improvement method improving the saturating dewatering of sludge electroosmotic, comprising the following steps:
Step 1: sludge condensation: sewage plant original suspension solid aqueous rate being down to 95%-97% by gravity concentration；
Step 2: flocculation conditioning: taking appropriate step 1 thickened sludge to pour into 500mL beaker, with 250 r/min revolving speeds in constant temperature
1 min is stirred on magnetic stirring apparatus, 10mL aluminium polychloride (PAC) solution is added, and stir 1 min with 200 r/min revolving speeds,
10 min are stirred with 80 r/min revolving speeds again, content of flocculating is 80-250mg/g over dry sludge in mixed liquor, and sludge conditioning is complete
Taken after 50 mL conditioning sludge in Buchner funnel (60 mm of diameter), pressure P be -0.055 MPa negative pressure of vacuum under into
Row filters dehydration, completes to filter after 20 min, collects enough dewatered sludges；
Step 3: biological wall breaking: rhamnolipid being added in step 2 dewatered sludge and carries out biological wall breaking, rhamnolipid additive amount
For 120-250mg/g over dry sludge, dewatered sludge with 200 r/min revolving speeds stirs 1 min after mixing with rhamnolipid solution, then
10 min are stirred with 80 r/min revolving speeds, complete biological wall breaking；
Step 4: physical modification: before electroosmotic dewatering, physical characteristic (conductivity and the Zeta of broken wall sludge are adjusted by NaCl
Current potential), to meet electroosmotic dewatering requirement, NaCl dosage is 80-120mg/g over dry sludge, and sludge conductivity is after adjustment
10-13 mS/cm, Zeta potential are -1--3 mV；
Step 5: electroosmotic dewatering: sludge obtained by step 4 being transferred to electroosmotic dewatering device and carries out deep dehydration, wherein mud
Cake is with a thickness of 10mm, dewatering time 15min, and after the completion of electroosmotic dewatering, discharge moisture percentage in sewage sludge≤60%；
Step 6: dehydration filtrate recycles: Step 1: two and five dehydration filtrates are back to biochemical zone and handle again.
Preferably, dehydration is filtered in the step 2 also can be used the mechanical dehydrations modes such as centrifugal dehydration, belt filters pressing.
Preferably, flocculant can be polyacrylamide (PAM), aluminium polychloride (PAC), polyaluminum sulfate in the step 2
One or more of iron (PFS) compounding.
Preferably, rhamnolipid can be replaced by sophorolipid in the step 3.
Preferably, the step 2 flocculation conditioning medicament PAC is technical grade, and aluminium oxide is (with Al2O3Content meter) >=28%, lead to
Cross cation high molecular charging neutrality and adsorption bridging effect, compress sludge electric double layer, increase mud granule agglomerate power and
Sludge partial size improves dewatering.
Preferably, the step 3 biological wall breaking medicament rhamnolipid is technical grade, and content 25% passes through biological surface
Activating agent to sludge wadding body crack and the solubilization of EPS, change sludge physical chemistry composition and floc characteristic so that dirty
Mud apparent viscosity is down to 25-35 mpa.s, enhances sludge mobility, while releasing the " constraint wrapped up in tridimensional network
Water " is changed into Free water and Interstitial Water that electro-osmosis is easily removed.
Preferably, the step 5 electroosmotic dewatering device operating parameter is voltage 30V, mechanical pressure 80kpa.
Preferably, the step 5 electro-osmosis device includes cylindrical chamber, and the electro-osmosis device includes column type chamber,
The internal diameter of the cylindrical chamber is 80mm, is equipped with compression piston in the cylindrical cavity room, the top of the compression piston is set
There is counterweight, the bottom of the compression piston is equipped with discoid anode, and the bottom of the cylindrical chamber is equipped with filter cloth, the filter cloth
Downside be equipped with mesh cathode, the downside of the mesh cathode is equipped with filtrate collection, and the downside of the filtrate collection is equipped with
Electronic analytical balance, the discoid anode are connected by conducting wire with DC power supply, and the mesh cathode is by conducting wire and directly
Galvanic electricity source is connected.
Preferably, the discoid anode is titanium-based ruthenium iridium coating layer anode, and the mesh cathode is stainless steel material, aperture
For 1.5mm, the filter cloth is PET material.
The present invention it is a kind of improve the saturating dewatering of sludge electroosmotic stage improvement method the utility model has the advantages that
1, stage improvement can change the physicochemical characteristics and floc characteristic of sludge, redistribute the moisture in sludge.Electric osmose
Thoroughly after dehydration, discharging moisture percentage in sewage sludge, which is stablized, is lower than 60%, and minimizing is obvious.
2, biological wall breaking agent can be biodegradable, and the sludge that discharges after dehydration meets subsequent sludge treatment requirement, without secondary pollution.
3, in lasting sludge handling process, electric field applies all to sludge dewatering, and moisture and sludge wadding body flow
Contrary, sludge dewatering is high-efficient.
4, ohm heat can be generated during electro-osmosis, so that sludge temperature increases.Under ohm heat and forceful electric power field action, disease
Pathogenic microorganism activity reduces or even broken wall inactivation, environmentally protective.
Detailed description of the invention
Fig. 1 is a kind of process flow chart for the stage improvement method for improving the saturating dewatering of sludge electroosmotic of the present invention.
Fig. 2 is that moisture percentage in sewage sludge variation becomes in a kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic of the present invention
Gesture figure.
Fig. 3 is the structure of electro-osmosis device in a kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic of the present invention
Schematic diagram.
Specific embodiment
The present invention is further elaborated below by way of the drawings and specific embodiments, it should be pointed out that: for this technology field
Common process personnel for, it is without departing from the principle of the present invention, equal to the modification of various equivalent forms of the invention
Fall within the application range as defined in the appended claims.
Embodiment 1
Step 1: flocculation conditioning: taking the thickened sludge of 200g moisture content 95% to pour into 500 mL beakers, with 250 r/min revolving speeds
1 min is stirred in constant temperature blender with magnetic force, 10 mL aluminium polychloride (PAC) solution is added, and stir with 200 r/min revolving speeds
1 min is mixed, then stirs 10 min with 80 r/min revolving speeds, content of flocculating is 80 mg/g over dry sludge, sludge tune in mixed liquor
Take 50 mL conditioning sludge in Buchner funnel (60 mm of diameter) after the completion of reason, in the negative pressure of vacuum that pressure P is -0.055 MPa
Under carry out suction filtration dehydration, complete to filter after 20 min, collect enough dewatered sludges；
Step 2: biological wall breaking: 10 mL rhamnolipid solution being added in the dewatered sludge of step 1 moisture content 81.5% and carried out
Biological wall breaking, rhamnolipid additive amount be 80 mg/g over dry sludge, dewatered sludge mixed with rhamnolipid solution after with 200 r/
Min revolving speed stirs 1 min, then stirs 10 min with 80 r/min revolving speeds, and sewage sludge viscosity is down to 28.96 mpa.s；
Step 3: physical modification: the NaCl solution that 10 mL contents are 80 mg/g is added into step 2 biological wall breaking sludge,
Sludge conductivity is adjusted to 10.1 mS/cm, Zeta potential is adjusted to -1.23 mV；
Step 4: electroosmotic dewatering: modified sewage sludge is transferred to the deep dehydration for carrying out 15 min in electro-osmosis device, device fortune
Row parameter is 30 V of voltage, 80 kpa of mechanical pressure, 10 mm of sludge thickness, and discharging moisture percentage in sewage sludge is after the completion of dehydration
51.71%。
Embodiment 2
Step 1: flocculation conditioning: taking the thickened sludge of 200g moisture content 97% to pour into 500 mL beakers, with 250 r/min revolving speeds
1 min is stirred in constant temperature blender with magnetic force, 10 mL aluminium polychloride (PAC) solution is added, and stir with 200 r/min revolving speeds
1 min is mixed, then stirs 10 min with 80 r/min revolving speeds, content of flocculating is 120 mg/g over dry sludge, sludge in mixed liquor
Take 50 mL conditioning sludge in Buchner funnel (60 mm of diameter) after the completion of conditioning, it is negative in the vacuum that pressure P is -0.055 MPa
Pressure carries out suction filtration dehydration, completes to filter after 20 min, collects enough dewatered sludges；
Step 2: biological wall breaking: 10 mL rhamnolipid solution being added in the dewatered sludge of step 1 moisture content 78.57% and carried out
Biological wall breaking, rhamnolipid additive amount be 120 mg/g over dry sludge, dewatered sludge mixed with rhamnolipid solution after with 200
R/min revolving speed stirs 1 min, then stirs 10 min with 80 r/min revolving speeds, and sewage sludge viscosity is down to 30.55 mpa.s；
Step 3: physical modification: the NaCl solution that 10 mL contents are 120 mg/g is added into step 2 biological wall breaking sludge,
Dirty conductivity is adjusted to 13.2 mS/cm, Zeta potential is adjusted to -1.63 mV；
Step 4: electroosmotic dewatering: modified sewage sludge is transferred to the deep dehydration for carrying out 15 min in electro-osmosis device, device fortune
Row parameter is 30 V of voltage, 80 kpa of mechanical pressure, 10 mm of sludge thickness, and discharging moisture percentage in sewage sludge is after the completion of dehydration
50.34%。
As shown in figure 3, the electro-osmosis device includes column type chamber 1, the internal diameter of the cylindrical chamber 1 is 80mm, institute
It states and is equipped with compression piston 2 in cylindrical chamber 1, the top of the compression piston 2 is equipped with counterweight 3, the bottom of the compression piston 2
Equipped with discoid anode 4, the bottom of the cylindrical chamber 1 is equipped with filter cloth 5, and the downside of the filter cloth 5 is equipped with mesh cathode 6,
The downside of the mesh cathode 6 is equipped with filtrate collection 7, and the downside of the filtrate collection 7 is equipped with electronic analytical balance 8, institute
It states discoid anode 4 to be connected by conducting wire 9 with DC power supply 10, the mesh cathode 6 passes through conducting wire 9 and 10 phase of DC power supply
Connection.
A kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic of the present invention, can change sludge by stage improvement
Physicochemical characteristics and floc characteristic, redistribute the moisture in sludge.After electroosmotic dewatering, discharging moisture percentage in sewage sludge is steady
Surely it is lower than 60%, minimizing is obvious；Biological wall breaking agent can be biodegradable, and the sludge that discharges after dehydration meets subsequent sludge treatment requirement,
It is without secondary pollution；In lasting sludge handling process, electric field applies all to sludge dewatering, and moisture and sludge wadding body flow
Contrary, sludge dewatering is high-efficient；Ohm heat can be generated during electro-osmosis, so that sludge temperature increases.In ohm heat and
Under forceful electric power field action, pathogenic microorganism activity reduces or even broken wall inactivation, environmentally protective.
Claims (9)
1. a kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic, which comprises the following steps:
Step 1: sludge condensation: sewage plant original suspension solid aqueous rate being down to 95%-97% by gravity concentration；
Step 2: flocculation conditioning: taking appropriate step 1 thickened sludge to pour into 500mL beaker, with 250 r/min revolving speeds in constant temperature
1 min is stirred on magnetic stirring apparatus, 10mL aluminium polychloride (PAC) solution is added, and stir 1 min with 200 r/min revolving speeds,
10 min are stirred with 80 r/min revolving speeds again, content of flocculating is 80-250mg/g over dry sludge in mixed liquor, and sludge conditioning is complete
Taken after 50 mL conditioning sludge in Buchner funnel (60 mm of diameter), pressure P be -0.055 MPa negative pressure of vacuum under into
Row filters dehydration, completes to filter after 20 min, collects enough dewatered sludges；
Step 3: biological wall breaking: rhamnolipid being added in step 2 dewatered sludge and carries out biological wall breaking, rhamnolipid additive amount
For 120-250mg/g over dry sludge, dewatered sludge with 200 r/min revolving speeds stirs 1 min after mixing with rhamnolipid solution, then
10 min are stirred with 80 r/min revolving speeds, complete biological wall breaking；
Step 4: physical modification: before electroosmotic dewatering, physical characteristic (conductivity and the Zeta of broken wall sludge are adjusted by NaCl
Current potential), to meet electroosmotic dewatering requirement, NaCl dosage is 80-120mg/g over dry sludge, and sludge conductivity is after adjustment
10-13 mS/cm, Zeta potential are -1--3 mV；
Step 5: electroosmotic dewatering: sludge obtained by step 4 being transferred to electroosmotic dewatering device and carries out deep dehydration, wherein mud
Cake is with a thickness of 10mm, dewatering time 15min, and after the completion of electroosmotic dewatering, discharge moisture percentage in sewage sludge≤60%；
Step 6: dehydration filtrate recycles: Step 1: two and five dehydration filtrates are back to biochemical zone and handle again.
2. a kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic according to claim 1, which is characterized in that institute
It states to filter to be dehydrated in step 2 and the mechanical dehydrations modes such as centrifugal dehydration, belt filters pressing also can be used.
3. a kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic according to claim 1, which is characterized in that institute
State in step 2 flocculant can for one of polyacrylamide (PAM), aluminium polychloride (PAC), bodied ferric sulfate (PFS) or
Several compoundings.
4. a kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic according to claim 1, which is characterized in that institute
Stating rhamnolipid in step 3 can be replaced by sophorolipid.
5. a kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic according to claim 1, which is characterized in that institute
Stating step 2 flocculation conditioning medicament PAC is technical grade, and aluminium oxide is (with Al2O3Content meter) >=28%, pass through cation high molecular electricity
Lotus neutralizes and adsorption bridging effect, compresses sludge electric double layer, increases mud granule and agglomerates power and sludge partial size, improves dehydration
Performance.
6. a kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic according to claim 1, which is characterized in that institute
Stating step 3 biological wall breaking medicament rhamnolipid is technical grade, content 25%, by biosurfactant to sludge wadding body
The solubilization with EPS is cracked, changes the physical chemistry composition and floc characteristic of sludge, so that sludge apparent viscosity is down to 25-
35 mpa.s enhance sludge mobility, while releasing " irreducible water " wrapped up in tridimensional network, and it is easy to be changed into electro-osmosis
In the Free water and Interstitial Water of removal.
7. a kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic according to claim 1, which is characterized in that institute
Stating step 5 electroosmotic dewatering device operating parameter is voltage 30V, mechanical pressure 80kpa.
8. a kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic according to claim 1, which is characterized in that institute
Stating electro-osmosis device includes column type chamber, and the internal diameter of the cylindrical chamber is 80mm, is equipped with compression in the cylindrical cavity room
Piston, the top of the compression piston are equipped with counterweight, and the bottom of the compression piston is equipped with discoid anode, the cylindrical cavity
The bottom of room is equipped with filter cloth, and the downside of the filter cloth is equipped with mesh cathode, and the downside of the mesh cathode is equipped with filtrate collection,
The downside of the filtrate collection is equipped with electronic analytical balance, and the discoid anode is connected by conducting wire with DC power supply,
The mesh cathode is connected by conducting wire with DC power supply.
9. a kind of stage improvement method for improving the saturating dewatering of sludge electroosmotic according to claim 5, which is characterized in that institute
Stating discoid anode is titanium-based ruthenium iridium coating layer anode, and the mesh cathode is stainless steel material, aperture 1.5mm, the filter cloth
For PET material.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114804585A (en) * | 2022-05-19 | 2022-07-29 | 浙大宁波理工学院 | Method for treating polluted bottom mud by electroosmosis incineration |
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