CN108178487A - A kind of sludge of sewage treatment plant deep dehydration method - Google Patents
A kind of sludge of sewage treatment plant deep dehydration method Download PDFInfo
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- CN108178487A CN108178487A CN201711288668.0A CN201711288668A CN108178487A CN 108178487 A CN108178487 A CN 108178487A CN 201711288668 A CN201711288668 A CN 201711288668A CN 108178487 A CN108178487 A CN 108178487A
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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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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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
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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- Treatment Of Sludge (AREA)
Abstract
The present invention relates to a kind of sludge of sewage treatment plant deep dehydration method, including sludge condensation；Sludge conditioning：It is added in into initial concentration treated sludge and accounts for the aluminium polychloride of over dry sludge quality 3~10% and carry out mixing conditioning；Layered shaping：By the sludge stratification after conditioning, supernatant liquor and moisture content are obtained as 94 96% lower floor's sludge, supernatant liquor is discharged；Sludge circulation：Lower floor's sludge part is retained, cycle is for subsequently into the sludge conditioning of mud, another part discharge；Press dewatering.The present invention is improved using aluminium polychloride, simultaneously sludge conditioning process is participated in using the relatively low lower floor's sludge circulation of a part of moisture content, lower floor's sludge provides the nuclei of crystallization for sludge coagulation, further improve the settling property of sludge, it reduces into mud moisture content, so that sludge can obtain lower floor's sludge that moisture content is 94 96% through simple process, the final deep dehydration for efficiently realizing sludge obtains unexpected dehydrating effect.
Description
Technical field
The present invention relates to technical field of sludge treatment more particularly to a kind of sludge of sewage treatment plant deep dehydration methods.
Background technology
With the high speed development of China's urban wastewater treatment Facilities Construction, urban sewage treatment plant sludge yield is also increasingly
Increase.By the end of the year 2013, national urban sewage treatment plant sludge total output has been broken through 30,000,000 tons (moisture content 80% is counted).
According to prediction, end is planned to " 12th Five-Year Plan ", city sludge yield may be close to 50,000,000 tons (moisture content 80% is counted).Sludge takes off
Water can not only make sludge quantity significantly cut down and be connected with subsequent processes such as Sludge landfill, burning, land uses
Necessary links.Sludge dewatering is wastewater treatment in China factory sludge disposal technology the most universal, and utility ratio is almost nearly
100%.
The moisture content of sludge sewage is usually the dewatering technology of mud through routine for 99.2%-99.8%
Moisture content can generally be down to 80% or so after dehydration, and moisture percentage in sewage sludge at this time is still higher, in amorphous state, no matter
It is that stacking, transport or subsequent processing disposition are relatively difficult, therefore, need to sludge be subjected to deep dehydration.At present, at sewage
The method that reason factory carries out deep dehydration to sludge mainly includes：Sludge condensation plus ferric trichloride and lime combination medicament are wadded a quilt with cotton
Solidifying and conventional crushing is dehydrated these three steps, and current dewatering has the following disadvantages：1) according to the difference of sludge quality,
Ferric trichloride be averaged dosage be over dry sludge quantity 5%, quick lime be averaged dosage for over dry sludge quantity 20%-30%,
The amount of dewatered sludge is considerably increased, and is also unfavorable for subsequent sludge consumption disposition after feeding lime；2) press dewatering step
The problem of mud handling capacity is very big, low there are treatment effeciency, high energy consumption.
Invention content
The technical problem to be solved by the present invention is to solve the above shortcomings of the prior art and to provide a kind of sewage treatment plants
Deep dehydration method for sludge does not need to add FeCL3With lime, while the fixed diaphragm pressing sheet frame of conventional filter cloth is also overcome
The problems of.
The technical solution that the present invention solves above-mentioned technical problem is as follows：A kind of sludge of sewage treatment plant deep dehydration method,
Include the following steps:
Step 1, sludge condensation：Sludge is subjected to initial concentration processing, obtains the sludge that moisture content is 96-98%；
Step 2, sludge conditioning：It is added in by initial concentration treated sludge and accounts for over dry sludge quality 3~10%
Aluminium polychloride, and stir carry out mixing conditioning；
Step 3, layered shaping：By the sludge stratification after conditioning, it is 94- to obtain supernatant liquor and moisture content
96% lower floor's sludge, supernatant liquor is discharged；
Step 4, sludge circulation：Lower floor's sludge part is retained, cycle is used for subsequently into the sludge conditioning of mud, another
It discharges part；
Step 5, press dewatering：The sludge of discharge is subjected to press dewatering processing, obtains the dirt that moisture content is 55-65%
Mud completes the deep dehydration of sludge.
Based on the above technical solution, the present invention can also be improved as follows：
Further：In the step 1, using gravity concentration tank, the gravity concentration tank is consolidated for the initial concentration processing
Body flux is 35-45kg/ (m2D), concentration time 13-14h, available depth 3-4m, the bottom of pond gradient are 0.15-0.2.
The advantageous effect of above-mentioned further scheme is：By using gravity concentration tank, larger impact load can be born；
It consumes energy low, it is stable, it does not need to additionally add the flocculation medicament such as PAM again in concentration process, be layered convenient for post precipitation.
Further：In the step 2, added in by initial concentration treated sludge account for over dry sludge quality 3~
6% aluminium polychloride, stirring conditioning time are 30-60min.
The advantageous effect of above-mentioned further scheme is：Aluminium polychloride is a kind of water-soluble inorganic high molecular polymer,
There is height charge neutrality and bridge linking effect to the colloid in sludge and particulate matter, formation alumen ustum is big, and the close precipitation of matter is fast, and water outlet is turbid
Spend low, dewatering is good.
Further：In the step 2, sludge conditioning carries out in the sludge conditioning pond of belt stirrer, the rotating speed of blender
For 20-30r/min.
The advantageous effect of above-mentioned further scheme is：After setting the blender that can add in coagulant, mix
Solidifying agent and the mixing of sludge are more uniform, while can accelerate conditioning progress, obtain preferable conditioning effect.
Further：In the step 3, layered shaping is carried out with sludge conditioning in same sludge conditioning pond, is layered
Stop stirring and disengaging sludge during processing, the stratification time is 30-60min.
The advantageous effect of above-mentioned further scheme is：By in same sludge conditioning pond stratification can shorten place
The time is managed, and the water in sludge is separated, further to reduce the moisture content in sludge, is handled convenient for subsequently disposition.
Further：In the step 4, the lower floor's sludge for accounting for lower floor sludge volume 10-50% is retained.
The advantageous effect of above-mentioned further scheme is：It is protected by the lower floor's sludge that will account for lower floor sludge volume 10-50%
It stays, can increase subsequently into the flocculability of mud, to shorten flocculation time, improve flocculation efficiency.
Further：In the step 4, the lower floor's sludge for accounting for lower floor sludge volume 20-30% is retained.
Further：In the step 5, the sludge that step 4 is discharged is carried out using filter cloth walking type diaphragm plate frame squeezer
Press dewatering processing.
Further：In the step 5, the sludge that step 4 is discharged is passed through to filter cloth walking type diaphragm type sheet frame squeezer
Filter chamber in carry out squeeze and filter, sewage sludge feed pressure be not more than 0.5Mpa, squeeze pressure be not more than 1.5MPa.
The advantageous effect of above-mentioned further scheme is：Due to use walking diaphragm plate squeezer, it is only necessary to it is smaller into
Expect pressure and diaphragm pressing pressure, energy consumption can be substantially reduced, and shorten the discharge time, improve dehydration efficiency.
Further：In the step 5, sewage sludge feed pressure is 0.3-0.5Mpa, squeeze pressure 1.0-1.5MPa.
Further：In the step 1, initial concentration treated moisture percentage in sewage sludge is 96-97%.
Compared with prior art, there are advantages below by the present invention：
One, aluminium polychloride are a kind of water treatment agents, are typically used as water purification agent or sewage coagulation in the prior art
Agent is rarely used in sludge dewatering.And the present invention carries out sludge using the aluminium polychloride for accounting for over dry sludge quality 3~10%
Mixing conditioning, while utilize the mixing conditioning process of the relatively low lower floor's sludge circulation participation sludge of a part of moisture content, main mesh
's：(1) nuclei of crystallization are provided for sludge coagulation, further improves the settling property of sludge, (2) are reduced into mud moisture content.So that dirt
Mud can obtain lower floor's sludge that moisture content is 94-96% through simple process, obtain unexpected dehydrating effect；
Second, the present invention need not add PAM medicaments and lime, reagent cost is not only reduced, it is often more important that substantially subtract
Lack the sludge quantity into press dewatering link and final dewatered sludge amount, alleviate the same of press dewatering load and energy consumption
When, provide good condition for the consumption disposition of subsequent sludge；
Third, the present invention outer row's supernatant liquor before press dewatering, not only reduces the moisture content of sludge, improves dirt
Dewatering of the mud in subsequent technique, also further mitigates press dewatering load and energy consumption, shortens press dewatering processing
Time so that entire deeply dehydrating sludge processing time is fewer 4-8h than existing dehydration treatment time, and dehydration efficiency improves 10-
30%, the final deep dehydration for realizing sludge achievees the purpose that convenient for stacking, transport and subsequent processing disposition；
Fourth, be typically at present that press dewatering is carried out using the fixed squeezing mode of filter cloth to the sludge of sewage treatment plant,
And the present invention carries out sludge using filter cloth walking type press filtration mode press dewatering, and Optimizing Process Parameters, solves existing filter
Feed time existing for the fixed squeezer of cloth grows (the existing fixed every batch of duration 3-4h of filter cloth, every batch of duration of the present invention
30-50min), feed pressure height, every batch of longevity of service, filter plate discharge time are long, and discharging is not thorough and filter cloth uses the longevity
Order the problems such as short.
Specific embodiment
The principles and features of the present invention are described below, and the given examples are served only to explain the present invention, is not intended to limit
Determine the scope of the present invention.
A kind of sludge of sewage treatment plant deep dehydration method, includes the following steps:
Step 1, sludge condensation：Sludge is subjected to initial concentration processing, obtains the sludge that moisture content is 96-98%；
Step 2, sludge conditioning：It is added in by initial concentration treated sludge and accounts for over dry sludge quality 3~10%
Aluminium polychloride, and stir carry out mixing conditioning；
Step 3, layered shaping：By the sludge stratification after conditioning, it is 94- to obtain supernatant liquor and moisture content
96% lower floor's sludge, supernatant liquor is discharged；
Step 4, sludge circulation：Lower floor's sludge part is retained, cycle is used for subsequently into the sludge conditioning of mud, another
It discharges part；
Step 5, press dewatering：The sludge of discharge is subjected to press dewatering processing, obtains the dirt that moisture content is 55-65%
Mud completes the deep dehydration of sludge.
The dewatering of the present invention, by being concentrated to sludge, anti impulsion load is high, without adding PAM medicaments and stone
Ash, mud decrement effect is good, and the consumption of subsequent sludge is influenced small；And discharge supernatant liquor after static layering, into one
Step reduces the moisture content of sludge, reduces the energy consumption of subsequent treatment process, while also improve the dewatering of subsequent technique,
Realize sludge deep dehydration, convenient for stack, transport and subsequent processing disposition.
In the above-described embodiments, in the step 1, the concentration uses gravity concentration tank, the gravity concentration tank
Solids flux be 35-45kg/ (m2D), concentration time 13-14h, available depth 3-4m, bottom of pond gradient 0.15-0.2.
Certainly, in practice, this segment process can also use mechanical thickening.But compared with mechanical thickening, using gravity concentration
The advantages of：By using gravity concentration tank, larger impact load can be born；It consumes energy low, it is stable, in concentration process
It does not need to additionally add the flocculation medicament such as PAM again, be layered convenient for post precipitation.
Preferably, in the above-described embodiments, it in the step 2, adds in and accounts in by initial concentration treated sludge
The aluminium polychloride of over dry sludge quality 3-6%, stirring conditioning time are 30-60min.Here, it is polymerization chlorine actually to add
Change aluminum solutions, the mass fraction of the aluminium polychloride generally can be 10-30%.Aluminium polychloride is a kind of water-soluble nothing
Machine high molecular polymer has height charge neutrality and bridge linking effect to the colloid in sludge and particulate matter, and formation alumen ustum is big,
The close precipitation of matter is fast, and delivery turbidity is low, and dewatering is good.By carrying out medicament conditioning to sludge, preferable decrement effect can be obtained
Fruit, and subsequent sludge will not be dissolved and generate large effect.
Preferably, in the above-described embodiments, in the step 2, the mixing conditioning uses the sludge conditioning of belt stirrer
Pond, and the rotating speed of the blender is 20-30r/min.By set it is described can add in coagulant after, coagulant with
The mixing of sludge is more uniform, while can accelerate conditioning progress, obtains preferable conditioning effect.
In the above-described embodiments, in the step 3, layered shaping is carried out with sludge conditioning in same sludge conditioning pond,
It carries out stopping stirring and disengaging sludge during layered shaping, the stratification time is 30-60min.By in same sludge conditioning pond
Stratification can separate the water in sludge, further to reduce the moisture content in sludge, at subsequently disposition
Reason.
Preferably, in the above-described embodiments, in the step 4, lower floor's sludge of lower floor sludge volume 10-50% will be accounted for
Retain.Retained by the lower floor's sludge that will account for lower floor sludge volume 20-30%, can increased subsequently into the flocculability of mud, to shorten
Flocculation time improves flocculation efficiency.
It is highly preferred that in the above-described embodiments, it is in the step 4, the lower floor for accounting for lower floor sludge volume 20-30% is dirty
Mud retains.
In the above-described embodiments, in the step 5, using filter cloth walking type diaphragm type sheet frame squeezer to being arranged in step 4
The lower floor's sludge gone out carries out press dewatering processing, specifically includes：
Step 51：The filter plate of squeezer is driven to be closed, to form closed filter chamber；
Step 52：Lower floor's sludge after layering is passed through in the filter chamber and being filtered, obtains mud cake, and will filter
Liquid after filter-cloth filtering via discharging；
Step 53：The diaphragm of squeezer is expanded by high pressure water and squeezes the mud cake, and the water of extrusion is discharged；
Step 54：All filter plates of driving squeezer open simultaneously, and make to squeeze using running gear above and below the filter cloth of squeezer
Mud cake after pressure peels off, and the water squeezed out in the filtrate in the step 42 and the step 43 is recycled；
Step 55：Clean the filter cloth.
By being filtered in filter chamber by filter cloth, can realize the further dehydration purpose to sludge, feed pressure with
Diaphragm pressing pressure is relatively low, and energy conservation and environmental protection, the discharge time is short, and dump is thorough；Every batch of only needs 30min, operation allotment spirit
Living, filter cloth cleaning pressure is low, only 0.5MPa, can effectively reduce the excessively high damage to filter cloth of cleaning pressure, extend making for filter cloth
Use the service life.
In the present embodiment, in the step 52, lower floor's sludge after the layering is passed through to institute using frequency conversion feed pump
It states in filter chamber, feed pressure is not more than 0.5Mpa, and diaphragm pressing pressure is not more than 1.5MPa, and filter cloth cleaning pressure is not more than
0.5Mpa.Due to using walking diaphragm plate squeezer, it is only necessary to smaller feed pressure and diaphragm pressing pressure, Ke Yi great
It is big to reduce energy consumption, and shorten the discharge time, improve dehydration efficiency.
Preferably, in the above-described embodiments, in the step 42, the frequency conversion feed pump will using top feed mode
Lower floor's sludge after the layering is passed through to the filter chamber.It can ensure that charging is uniform by the way of top feed, avoid
Sludge is accumulated in certain side, is discharged after filter-cloth filtering convenient for the water in sludge.
Preferably, in the above-described embodiments, in the step 5, sewage sludge feed pressure be 0.3-0.5Mpa, squeeze pressure
For 1.0-1.5MPa.
Compared with prior art, there are advantages below by the present invention：
One, aluminium polychloride are a kind of water treatment agents, are typically used as water purification agent or sewage coagulation in the prior art
Agent is rarely used in sludge dewatering.And the present invention carries out sludge mixing conditioning, while profit using 3~10% aluminium polychloride
The mixing that sludge is participated in the relatively low lower floor's sludge circulation of a part of moisture content improves process, main purpose：(1) it is mixed for sludge
It is solidifying that the nuclei of crystallization are provided, the settling property of sludge is further improved, (2) are reduced into mud moisture content.So that sludge is through simple process
Lower floor's sludge that moisture content is 94-96% can be obtained, obtains unexpected dehydrating effect；
Second, the present invention need not add PAM medicaments and lime, reagent cost is not only reduced, it is often more important that substantially subtract
Lack the sludge quantity into press dewatering link and final dewatered sludge amount, alleviate the same of press dewatering load and energy consumption
When, provide good condition for the consumption disposition of subsequent sludge；
Third, the present invention outer row's supernatant liquor before press dewatering, not only reduces the moisture content of sludge, improves dirt
Dewatering of the mud in subsequent technique, also further mitigates press dewatering load and energy consumption, shortens press dewatering processing
Time so that entire deeply dehydrating sludge processing time is fewer 4-8h than existing dehydration treatment time, improves dehydration efficiency 10-
30%, the final deep dehydration for realizing sludge achievees the purpose that convenient for stacking, transport and subsequent processing disposition；
Fourth, be typically at present that press dewatering is carried out using the fixed squeezing mode of filter cloth to the sludge of sewage treatment plant,
And the present invention carries out sludge using filter cloth walking type press filtration mode press dewatering, and Optimizing Process Parameters, solves existing filter
Feed time length, feed pressure height, every batch of longevity of service, filter plate discharge time are long existing for the fixed squeezing of cloth, discharging
It is not thorough and the problems such as filter cloth service life is short.
Embodiment 1
Sewage plant sludge is initially entered gravity concentration tank to concentrate, concentration basin solids flux is 40kg/ (m2D),
Concentration time 13.5h, available depth 3.5m, grizzly bar thickener outer rim linear velocity be 1.5m/min, the concentration basin bottom of pond gradient
0.18, moisture percentage in sewage sludge is 96.5% after concentration.
Sludge after concentration is entered into sludge conditioning pond by screw pump pump drainage again, is added in conditioner when sewage sludge feed
Enter to account for the PAC solution (mass fraction 20%) of over dry sludge quality 4.5%, be stirred and mix with sludge, stir 45min
After stop blender, be allowed to rest for precipitation 45min layering, supernatant is discharged by supernatant delivery pipe, aqueous to reduce sludge
Rate retains to 95.5%, while by the lower floor's sludge for accounting for lower floor's sludge volume 22%, remaining sludge is expelled to squeezer and is pressed
Squeeze dehydration.In this segment process, sludge is 4.5h in the sludge conditioning pond residence time, and conditioner is rectangular or round, in pond
It is frequency control that top, which sets blender, rotating speed 25r/min, and the blender,.
Finally a part for lower floor's sludge after layering (volume accounting is 22%) is retained in conditioner, remaining is dirty
Mud is expelled to squeezer and carries out press dewatering so that the moisture content of sludge is further reduced to 57.8%.
Embodiment 2
Sewage plant sludge is initially entered gravity concentration tank to concentrate, concentration basin solids flux is 42kg/ (m2D),
Concentration time 13.8h, available depth 4m, grizzly bar thickener outer rim linear velocity are 1.5m/min, and the concentration basin bottom of pond gradient 0.2 is dense
Moisture percentage in sewage sludge is 96.2% after contracting.
Sludge after concentration is entered into sludge conditioning pond by screw pump pump drainage again, is added in conditioner when sewage sludge feed
Enter to account for the PAC solution (mass fraction 20%) of over dry sludge quality 5%, be stirred and mix with sludge, after stirring 50min
Stop blender, be allowed to rest for precipitation 47min layerings, supernatant is discharged by supernatant delivery pipe, to reduce moisture percentage in sewage sludge
To 95.1%.In this segment process, sludge is 4.4h in the sludge conditioning pond residence time, and conditioner is rectangular or round, in Chi Ding
It is frequency control that portion, which sets blender, rotating speed 25r/min, and the blender,.
Finally a part for lower floor's sludge after layering (volume accounting is 24%) is retained in conditioner, remaining
Sludge is expelled to squeezer and carries out press dewatering so that the moisture content of sludge is further reduced to 56.4%.
Embodiment 3
Sewage plant sludge is initially entered gravity concentration tank to concentrate, concentration basin solids flux is 44 kg/ (m2D),
Concentration time 14h, available depth 3.8m, grizzly bar thickener outer rim linear velocity be 1.5m/min, the concentration basin bottom of pond gradient 0.16,
Moisture percentage in sewage sludge is 96.1% after concentration.
Sludge after concentration is entered into sludge conditioning pond by screw pump pump drainage again, is added in conditioner when sewage sludge feed
Enter to account for the PAC solution (mass fraction 20%) of over dry sludge quality 5.5%, be stirred and mix with sludge, stir 54min
After stop blender, be allowed to rest for precipitation 50min layering, supernatant is discharged by supernatant delivery pipe, aqueous to reduce sludge
Rate is to 95.2%.In this segment process, sludge is 4.6h in the sludge conditioning pond residence time, and conditioner is rectangular or round, in pond
It is frequency control that top, which sets blender, rotating speed 25r/min, and the blender,.
Finally a part for lower floor's sludge after layering (volume accounting is 26%) is retained in conditioner, remaining is dirty
Mud is expelled to squeezer and carries out press dewatering so that the moisture content of sludge is further reduced to 56.9%.
Embodiment 4
Sewage plant sludge is initially entered gravity concentration tank to concentrate, concentration basin solids flux is 43 kg/ (m2D),
Concentration time 13.7h, available depth 3.95m, grizzly bar thickener outer rim linear velocity be 1.5m/min, the concentration basin bottom of pond gradient
0.17, moisture percentage in sewage sludge is 96.1% after concentration.
Sludge after concentration is entered into sludge conditioning pond by screw pump pump drainage again, is added in conditioner when sewage sludge feed
Enter to account for the PAC solution (mass fraction 20%) of over dry sludge quality 5.4%, be stirred and mix with sludge, stir 58min
After stop blender, be allowed to rest for precipitation 58min layering, supernatant is discharged by supernatant delivery pipe, aqueous to reduce sludge
Rate is to 95.7%.In this segment process, sludge is 4.75h in the sludge conditioning pond residence time, conditioner to be rectangular or round,
Setting blender, rotating speed 25r/min, and the blender are frequency control at the top of pond.
Finally a part for lower floor's sludge after layering (volume accounting is 25%) is retained in conditioner, remaining is dirty
Mud is expelled to squeezer and carries out press dewatering so that the moisture content of sludge is further reduced to 56.1%.
Embodiment 5
Sewage plant sludge is initially entered gravity concentration tank to concentrate, concentration basin solids flux is 42.5 kg/ (m2·
D), concentration time 13.2h, available depth 3.67m, grizzly bar thickener outer rim linear velocity be 1.5m/min, the concentration basin bottom of pond gradient
0.175, moisture percentage in sewage sludge is 96.2% after concentration.
Sludge after concentration is entered into sludge conditioning pond by screw pump pump drainage again, is added in conditioner when sewage sludge feed
Enter to account for the PAC solution (mass fraction 20%) of over dry sludge quality 5.7%, be stirred and mix with sludge, stir 56min
After stop blender, be allowed to rest for precipitation 58min layering, supernatant is discharged by supernatant delivery pipe, aqueous to reduce sludge
Rate is to 95.5%.In this segment process, sludge is 4.62h in the sludge conditioning pond residence time, conditioner to be rectangular or round,
Setting blender, rotating speed 25r/min, and the blender are frequency control at the top of pond.
Finally a part for lower floor's sludge after layering (volume accounting is 27%) is retained in conditioner, remaining is dirty
Mud is expelled to squeezer and carries out press dewatering so that the moisture content of sludge is further reduced to 56.6%.
It can be seen that the sludge of sewage treatment plant deep dehydration method of the present invention, it can be effectively to the dirt of sewage treatment plant
Mud carries out deep dehydration, and the moisture content in sludge can be reduced to 60% hereinafter, can meet current Treatment of Sludge in this way
Technological requirement can be such that sludge quantity significantly cuts down, convenient for stacking, transporting still follow-up Sludge landfill, burning, land use
Deng disposition.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of sludge of sewage treatment plant deep dehydration method, which is characterized in that include the following steps:
Step 1, sludge condensation：Sludge is subjected to initial concentration processing, obtains the sludge that moisture content is 96-98%；
Step 2, sludge conditioning：It is added in by initial concentration treated sludge and accounts for the poly- of over dry sludge quality 3~10%
Aluminium chloride is closed, and stirs and carries out mixing conditioning；
Step 3, layered shaping：By the sludge stratification after conditioning, it is 94-96%'s to obtain supernatant liquor and moisture content
Lower floor's sludge, supernatant liquor is discharged；
Step 4, sludge circulation：Lower floor's sludge part is retained, cycle is for subsequently into the sludge conditioning of mud, another part row
Go out；
Step 5, press dewatering：The sludge of discharge is subjected to press dewatering processing, obtains the sludge that moisture content is 55-65%, it is complete
Into the deep dehydration of sludge.
2. sludge of sewage treatment plant deep dehydration method according to claim 1, which is characterized in that in the step 1, institute
Initial concentration processing is stated using gravity concentration tank, the solids flux of the gravity concentration tank is 35-45kg/ (m2D), during concentration
Between for 13-14h, available depth 3-4m, the bottom of pond gradient is 0.15-0.2.
3. sludge of sewage treatment plant deep dehydration method according to claim 1, which is characterized in that in the step 2, to
The aluminium polychloride of over dry sludge quality 3~6% is accounted for by being added in initial concentration treated sludge, stirring conditioning time is
30-60min。
4. sludge of sewage treatment plant deep dehydration method according to claim 3, which is characterized in that dirty in the step 2
Mud conditioning carries out in the sludge conditioning pond of belt stirrer, and the rotating speed of the blender is 20-30r/min.
5. sludge of sewage treatment plant deep dehydration method according to claim 1, which is characterized in that in the step 3, point
Layer processing is carried out with sludge conditioning in same sludge conditioning pond, is carried out stopping stirring and disengaging sludge during layered shaping, be stood
Separation time is 30-60min.
6. sludge of sewage treatment plant deep dehydration method according to claim 1, which is characterized in that, will in the step 4
The lower floor's sludge for accounting for lower floor sludge volume 10-50% retains.
7. sludge of sewage treatment plant deep dehydration method according to claim 6, which is characterized in that, will in the step 4
The lower floor's sludge for accounting for lower floor sludge volume 20-30% retains.
8. sludge of sewage treatment plant deep dehydration method according to any one of claims 1 to 7, which is characterized in that described
In step 5, press dewatering processing is carried out to the sludge that step 4 is discharged using filter cloth walking type diaphragm plate frame squeezer.
9. sludge of sewage treatment plant deep dehydration method according to claim 8, which is characterized in that, will in the step 5
The sludge that step 4 is discharged is passed through to carrying out squeeze and filter, sewage sludge feed in the filter chamber of filter cloth walking type diaphragm type sheet frame squeezer
Pressure is not more than 0.5Mpa, and squeeze pressure is not more than 1.5Mpa.
10. sludge of sewage treatment plant deep dehydration method according to claim 9, which is characterized in that in the step 5,
Sewage sludge feed pressure is 0.3-0.5Mpa, squeeze pressure 1.0-1.5MPa.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110451768A (en) * | 2019-07-25 | 2019-11-15 | 哈尔滨工业大学（深圳） | A kind of method of reaction tank and gravity concentration tank combination processing secondary settling tank excess sludge |
| CN111268886A (en) * | 2020-02-18 | 2020-06-12 | 中科乐美环保科技有限公司 | Deep dehydration method for sludge |
| CN113528211A (en) * | 2021-08-24 | 2021-10-22 | 安徽省通源环境节能股份有限公司 | High-temperature self-maintaining incineration system and process for municipal sludge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110451768A (en) * | 2019-07-25 | 2019-11-15 | 哈尔滨工业大学（深圳） | A kind of method of reaction tank and gravity concentration tank combination processing secondary settling tank excess sludge |
| CN111268886A (en) * | 2020-02-18 | 2020-06-12 | 中科乐美环保科技有限公司 | Deep dehydration method for sludge |
| CN113528211A (en) * | 2021-08-24 | 2021-10-22 | 安徽省通源环境节能股份有限公司 | High-temperature self-maintaining incineration system and process for municipal sludge |
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