CN109678312A - A method of sewage sludge dehydration is carried out using the dense salt waste water of seawater desalination reverse osmosis - Google Patents
A method of sewage sludge dehydration is carried out using the dense salt waste water of seawater desalination reverse osmosis Download PDFInfo
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- CN109678312A CN109678312A CN201910053949.0A CN201910053949A CN109678312A CN 109678312 A CN109678312 A CN 109678312A CN 201910053949 A CN201910053949 A CN 201910053949A CN 109678312 A CN109678312 A CN 109678312A
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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
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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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
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
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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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- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Treatment Of Sludge (AREA)
Abstract
A method of sewage sludge dehydration being carried out using the dense salt waste water of seawater desalination reverse osmosis, it is related to a kind of method of sewage sludge dehydration.The present invention is to solve conditionings early period of existing sewage sludge dehydration to consume technical problem big, that operating cost is high using chemical conditioning medicine.The present invention: one, primary concentration；Two, by after primary concentration bed mud and the dense salt waste water of seawater desalination reverse osmosis be mixed；Three, secondary concentration；Four, plate compression dehydration or centrifugal dehydration.The present invention utilizes the Ca in the dense salt waste water of seawater desalination reverse osmosis using the dense salt waste water of seawater desalination reverse osmosis as sewage sludge conditioner2+And Mg2+Reinforcement sludge wadding body skeleton structure improves sludge compressibility, so that improving sludge can degree of dehydration.Meanwhile the high concentration Na in the dense salt waste water of seawater desalination reverse osmosis+Destructible sludge wadding body extracellular polymeric structure discharges wadding body irreducible water, to improve dewatering performance of sludge.
Description
Technical field
The present invention relates to a kind of methods of sewage sludge dehydration.
Background technique
China designs daily handling ability about 1.33 × 10 in nearly more than 3000 seat of sewage treatment plant of operation at present8m3/d.It is surplus
Remaining sludge is the by-product of Wastewater Treated by Activated Sludge Process city domestic sewage, volume be generally sanitary sewage volume 0.3%~
0.5%, wet mud total output in China's is about 4.38 × 10 at present5m3/ d~7.3 × 105m3/d。
Moisture percentage in sewage sludge is high, bulky, and processing disposition is difficult, easily causes secondary pollution.Sludge dewatering volume reduction is mesh
Before unique method for solving the above problems, efficient sludge dewatering will make moisture percentage in sewage sludge decline to a great extent, and reduce sludge body
Product can reduce heat when sludge outward freight, the service life for extending sludge landfill, increase sludge incineration at the same time
Value, the processing cost for reducing the sludge later period.For the 20% of specific resistance to filtration expense Yi Zhan sewage treatment plant overall running cost
For~50% domestic sewage treatment plant, it is significant to reduce specific resistance to filtration expense.
Currently, the method that China's sewage plant mainly uses conditioning early period later period dehydration reduces the water content of sludge.Early period tune
Logos uses chemical conditioning to improve sludge wadding body skeleton knot that is, by adding various organic or inorganic chemical agents into sludge
Structure and physicochemical property improve dewatering performance of sludge, in order to later period mechanical dehydration.Common chemical conditioning medicament includes poly- third
Acrylamide (PAM), aluminium polychloride (PAC), iron chloride (FeCl3), quick lime (CaO) etc..The effect of chemical conditioning medicament
It is to improve sludge flocs stracture, changes sludge wadding body physicochemical property such as surface potential, viscosity, moisture distribution etc., promotes sludge wadding
It is solidifying, to improve dewatering performance of sludge, sludge CST value is greatly reduced and compare resistance value.However, existing chemical amendment is most
For the chemical agent product of purchase, chemical conditioning method has the problems such as medicine consumption is big, conditioning is at high cost.With with iron chloride
(FeCl3) for conditioning, national sludge yield presses 4.38 × 105m3/ d meter, dosage are empirically set as 0.8g/L, FeCl3
The medicament market price is about 6000 yuan/ton, then only improves medicament one cost just up to 4.38 × 105m3/d×0.8g/L×
1000 × 0.006 yuan/g × 365=7.7, hundred million yuan/year.
Calcium ion (Ca2+) can not only be by compression double electric layer and absorption-charge neutrality improved effect dewatering performance of sludge, together
When can improve sludge wadding body skeleton structure, improve sludge floc strength and resistance to compression, reduce wadding body in filter-press dehydration process
In avalanche, to improve sludge press filtration dewatering.Contain a large amount of Ca in seawater2+, having improves sludge flocculation structure,
Improve the potentiality of dewatering performance of sludge.The dense salt waste water of seawater desalination reverse osmosis is a kind of high-salt wastewater, Ca2+Concentration is about sea
1.5 times of water~2 times.The dense salt waste water of seawater desalination reverse osmosis is a kind of high pollution liquid waste generated in desalting process
Object, if arbitrarily discharge easily causes serious environmental pollution, processing disposition is environmental problem important at present.
Summary of the invention
The present invention is to solve conditionings early period of existing sewage sludge dehydration to consume big, operating cost using chemical conditioning medicine
High technical problem, and a kind of method for carrying out sewage sludge dehydration using the dense salt waste water of seawater desalination reverse osmosis is provided.
The method for carrying out sewage sludge dehydration using the dense salt waste water of seawater desalination reverse osmosis of the invention is according to the following steps
It carries out:
One, sewage sludge to be drained off is discharged into sludge first stage precipitation tank, after the gravity concentration of 10h~20h, discharge one
Bed mud after grade concentration；
Two, the bed mud after primary concentration is mixed with the dense salt waste water of seawater desalination reverse osmosis, then carries out two-stage stirring, the
Level-one mixing speed gradient is G1=17s-1~20s-1, first order mixing time is 2min~10min；Second level mixing speed
Gradient G2=1.5s-1~2.5s-1, second level mixing time is 30min~60min；
Na in the dense salt waste water of the seawater desalination reverse osmosis+Content is 5g/L~13g/L, Ca2+Content be 0.4g/L~
1g/L, Mg2+Content is 1g/L~2g/L；
The volume ratio of bed mud and the dense salt waste water of seawater desalination reverse osmosis after the primary concentration is 1:(0.5~2)；
Three, the sludge after two-stage stirring in step 2 is discharged into sludge second-level settling pond, and the gravity through 10h~20h is dense
Bed mud after contracting, after secondary concentration is discharged；
Four, it between the bed mud after secondary concentration being transferred to sludge dewatering, through plate compression dehydration or centrifugal dehydration, that is, completes dirty
The dehydration of sewage sludge；
When being dehydrated using plate compression, filters pressing pressure is 1MPa~2MPa, and time of filter pressing is 1.5h~4h, filters pressing to filters pressing
Machine, which stops draining, to be stopped；
When using centrifugal dehydration, centrifugal force is 2500r/min~4500r/min, and centrifugation time is 7min~15min.
Mixing speed gradientUnit is s-1；Wherein p is to the power of agitator of unit of water body, and unit is W/m3；
μ is the dynamic viscosity of water, and unit is Pas.
The present invention utilizes the dense salt of seawater desalination reverse osmosis using the dense salt waste water of seawater desalination reverse osmosis as sewage sludge conditioner
Ca in waste water2+And Mg2+Reinforcement sludge wadding body skeleton structure improves sludge compressibility, so that journey can be dehydrated by improving sludge
Degree.Meanwhile the high concentration Na in the dense salt waste water of seawater desalination reverse osmosis+Destructible sludge wadding body extracellular polymeric structure, release
Wadding body irreducible water, to improve dewatering performance of sludge.
The present invention has the advantage that
(1) the dense salt waste water sheet of seawater desalination reverse osmosis used in the present invention utilizes its institute as a kind of pollution waste
The Ca contained2+、Mg2+、Na+Equal ingredients improve sewage sludge, are the recyclings to waste, can be realized and " are controlled with useless
It is useless "；
(2) the dense salt waste water sheet of seawater desalination reverse osmosis used in the present invention is not necessarily to cost as a kind of pollution waste,
Without additionally adding chemical conditioning medicament, sludge conditioning process hardly needs cost, can save a large amount of expenditures, significantly drop
Low specific resistance to filtration cost；
(3) sewage sludge is handled through dewatering of the present invention, and moisture content of the cake can be reduced to after plate compression dehydration
65% hereinafter, moisture content of the cake can be reduced to 83% or less after centrifugal dehydration.
The present invention improves sewage sludge using the dense salt waste water of seawater desalination reverse osmosis, actually utilizes one kind
Pollution waste handles another kind pollution waste, realizes " treatment of wastes with processes of wastes against one another ", can effectively reduce sewage sludge conditioning
The use of chemical amendment in the process reduces Treatment of Sludge cost.
Specific embodiment
Specific embodiment 1: present embodiment utilizes the dense salt waste water of seawater desalination reverse osmosis to carry out sewage sludge to be a kind of
The method of dehydration specifically carries out according to the following steps:
One, sewage sludge to be drained off is discharged into sludge first stage precipitation tank, after the gravity concentration of 10h~20h, discharge one
Bed mud after grade concentration；
Two, the bed mud after primary concentration is mixed with the dense salt waste water of seawater desalination reverse osmosis, then carries out two-stage stirring, the
Level-one mixing speed gradient is G1=17s-1~20s-1, first order mixing time is 2min~10min；Second level mixing speed
Gradient G2=1.5s-1~2.5s-1, second level mixing time is 30min~60min；
Na in the dense salt waste water of the seawater desalination reverse osmosis+Content is 5g/L~13g/L, Ca2+Content be 0.4g/L~
1g/L, Mg2+Content is 1g/L~2g/L；
The volume ratio of bed mud and the dense salt waste water of seawater desalination reverse osmosis after the primary concentration is 1:(0.5~2)；
Three, the sludge after two-stage stirring in step 2 is discharged into sludge second-level settling pond, and the gravity through 10h~20h is dense
Bed mud after contracting, after secondary concentration is discharged；
Four, it between the bed mud after secondary concentration being transferred to sludge dewatering, through plate compression dehydration or centrifugal dehydration, that is, completes dirty
The dehydration of sewage sludge；
When being dehydrated using plate compression, filters pressing pressure is 1MPa~2MPa, and time of filter pressing is 1.5h~4h, filters pressing to filters pressing
Machine, which stops draining, to be stopped；
When using centrifugal dehydration, centrifugal force is 2500r/min~4500r/min, and centrifugation time is 7min~15min.
Specific embodiment 2: the present embodiment is different from the first embodiment in that: by primary concentration in step 2
Bed mud afterwards mixes in the duct with the dense salt waste water of seawater desalination reverse osmosis, and mixed liquor is then transferred to sludge conditioning pond and is carried out
Two-stage stirring.Other are same as the specific embodiment one.
Specific embodiment 3: the present embodiment is different from the first and the second embodiment in that: by level-one in step 2
Bed mud after concentration is mixed with the dense salt waste water of seawater desalination reverse osmosis, then carries out two-stage stirring, first order mixing speed gradient
For G1=18s-1, first order mixing time is 5min；Second level mixing speed gradient G 2=2s-1, second level mixing time is
45min.Other are the same as one or two specific embodiments.
Specific embodiment 4: unlike one of present embodiment and specific embodiment one to three: if in step 4
When being dehydrated using plate compression, filters pressing pressure is 1MPa, and time of filter pressing 3h, filters pressing to filter press, which stops draining, to be stopped.
Other are identical as one of specific embodiment one to three.
Specific embodiment 5: the present embodiment is different from the first embodiment in that: according to centrifugation in step 4
When dehydration, centrifugal force 300r/min, centrifugation time 10min.Other are same as the specific embodiment one.
The present invention is verified with following tests:
Test one: this test is a kind of method for carrying out sewage sludge dehydration using the dense salt waste water of seawater desalination reverse osmosis,
Specifically carry out according to the following steps:
One, sewage sludge to be drained off is discharged into sludge first stage precipitation tank, after the gravity concentration of 12h, discharge level-one is dense
Bed mud after contracting, the sludge concentration of bed mud are 28g/L；
Two, the bed mud after primary concentration is mixed with the dense salt waste water of seawater desalination reverse osmosis, then carries out two-stage stirring, the
Level-one mixing speed gradient is G1=18s-1, first order mixing time is 5min；Second level mixing speed gradient G2=2s-1, the
Second level mixing time is 45min；
Na in the dense salt waste water of the seawater desalination reverse osmosis+Content is 8g/L, Ca2+Content is 0.8g/L, Mg2+Content is
2g/L；
The volume ratio of bed mud and the dense salt waste water of seawater desalination reverse osmosis after the primary concentration is 1:1；
Three, the sludge after two-stage stirring in step 2 is discharged into sludge second-level settling pond, after the gravity concentration of 12h,
Bed mud after secondary concentration is discharged, the sludge concentration of bed mud are 22g/L；
Four, it between the bed mud after secondary concentration being transferred to sludge dewatering, is dehydrated through plate compression, i.e., completion sewage sludge is de-
Water；
When plate compression is dehydrated, filters pressing pressure is 1.6MPa, and filters pressing to filter press, which stops draining, to be stopped.
Mud cake average moisture content is after raw sewage (not conditioned sludge) is dehydrated under the conditions of identical plate compression
70%；Sludge mud cake average moisture content after this test dehydration is 63.8%.
Test two: this test is a kind of method for carrying out sewage sludge dehydration using the dense salt waste water of seawater desalination reverse osmosis,
Specifically carry out according to the following steps:
One, sewage sludge to be drained off is discharged into sludge first stage precipitation tank, after the gravity concentration of 12h, discharge level-one is dense
Bed mud after contracting, the sludge concentration of bed mud are 27g/L；
Two, the bed mud after primary concentration is mixed with the dense salt waste water of seawater desalination reverse osmosis, then carries out two-stage stirring, the
Level-one mixing speed gradient is G1=18s-1, first order mixing time is 5min；Second level mixing speed gradient G2=2s-1, the
Second level mixing time is 45min；
Na in the dense salt waste water of the seawater desalination reverse osmosis+Content is 8g/L, Ca2+Content is 0.8g/L, Mg2+Content is
2g/L；
The volume ratio of bed mud and the dense salt waste water of seawater desalination reverse osmosis after the primary concentration is 1:0.5；
Three, the sludge after two-stage stirring in step 2 is discharged into sludge second-level settling pond, after the gravity concentration of 12h,
Bed mud after secondary concentration is discharged, the sludge concentration of bed mud are 22g/L；
Four, it between the bed mud after secondary concentration being transferred to sludge dewatering, is dehydrated through plate compression, i.e., completion sewage sludge is de-
Water；
When plate compression is dehydrated, filters pressing pressure is 1.6MPa, and filters pressing to filter press, which stops draining, to be stopped.
Mud cake average moisture content is after raw sewage (not conditioned sludge) is dehydrated under the conditions of identical plate compression
70%；Sludge mud cake average moisture content after this test dehydration is 60%.
Test three: this test is a kind of method for carrying out sewage sludge dehydration using the dense salt waste water of seawater desalination reverse osmosis,
Specifically carry out according to the following steps:
One, sewage sludge to be drained off is discharged into sludge first stage precipitation tank, after the gravity concentration of 12h, discharge level-one is dense
Bed mud after contracting, the sludge concentration of bed mud are 28g/L；
Two, the bed mud after primary concentration is mixed with the dense salt waste water of seawater desalination reverse osmosis, then carries out two-stage stirring, the
Level-one mixing speed gradient is G1=18s-1, first order mixing time is 5min；Second level mixing speed gradient G2=2s-1, the
Second level mixing time is 45min；
Na in the dense salt waste water of the seawater desalination reverse osmosis+Content is 8g/L, Ca2+Content is 0.8g/L, Mg2+Content is
2g/L；
The volume ratio of bed mud and the dense salt waste water of seawater desalination reverse osmosis after the primary concentration is 1:1；
Three, the sludge after two-stage stirring in step 2 is discharged into sludge second-level settling pond, after the gravity concentration of 12h,
Bed mud after secondary concentration is discharged, the sludge concentration of bed mud are 21g/L；
Four, between the bed mud after secondary concentration being transferred to sludge dewatering, through centrifugal dehydration, centrifugal force 3500r/min, centrifugation
Time is 10min.
Mud cake average moisture content is after raw sewage (not conditioned sludge) is dehydrated under the conditions of identical plate compression
85.5%；Sludge mud cake average moisture content after this test dehydration is 79.7%.
Test four: this test is a kind of method for carrying out sewage sludge dehydration using the dense salt waste water of seawater desalination reverse osmosis,
Specifically carry out according to the following steps:
One, sewage sludge to be drained off is discharged into sludge first stage precipitation tank, after the gravity concentration of 12h, discharge level-one is dense
Bed mud after contracting, the sludge concentration of bed mud are 27g/L；
Two, the bed mud after primary concentration is mixed with the dense salt waste water of seawater desalination reverse osmosis, then carries out two-stage stirring, the
Level-one mixing speed gradient is G1=18s-1, first order mixing time is 5min；Second level mixing speed gradient G2=2s-1, the
Second level mixing time is 45min；
Na in the dense salt waste water of the seawater desalination reverse osmosis+Content is 8g/L, Ca2+Content is 0.8g/L, Mg2+Content is
2g/L；
The volume ratio of bed mud and the dense salt waste water of seawater desalination reverse osmosis after the primary concentration is 1:0.5；
Three, the sludge after two-stage stirring in step 2 is discharged into sludge second-level settling pond, after the gravity concentration of 12h,
Bed mud after secondary concentration is discharged, the sludge concentration of bed mud are 21g/L；
Four, between the bed mud after secondary concentration being transferred to sludge dewatering, through centrifugal dehydration, centrifugal force 3500r/min, centrifugation
Time is 10min.
Mud cake average moisture content is after raw sewage (not conditioned sludge) is dehydrated under the conditions of identical plate compression
85.5%；Sludge mud cake average moisture content after this test dehydration is 81.9%.
Claims (5)
1. a kind of method for carrying out sewage sludge dehydration using the dense salt waste water of seawater desalination reverse osmosis, it is characterised in that utilize seawater
Desalinate the method that reverse osmosis concentrated salt waste water carries out sewage sludge dehydration to carry out according to the following steps:
One, sewage sludge to be drained off is discharged into sludge first stage precipitation tank, after the gravity concentration of 10h~20h, discharge level-one is dense
Bed mud after contracting；
Two, the bed mud after primary concentration is mixed with the dense salt waste water of seawater desalination reverse osmosis, then carries out two-stage stirring, the first order
Mixing speed gradient is G1=17s-1~20s-1, first order mixing time is 2min~10min；Second level mixing speed gradient G2
=1.5s-1~2.5s-1, second level mixing time is 30min~60min；
Na in the dense salt waste water of the seawater desalination reverse osmosis+Content is 5g/L~13g/L, Ca2+Content is 0.4g/L~1g/L,
Mg2+Content is 1g/L~2g/L；
The volume ratio of bed mud and the dense salt waste water of seawater desalination reverse osmosis after the primary concentration is 1:(0.5~2)；
Three, the sludge after two-stage stirring in step 2 is discharged into sludge second-level settling pond, after the gravity concentration of 10h~20h,
Bed mud after secondary concentration is discharged；
Four, between the bed mud after secondary concentration being transferred to sludge dewatering, through plate compression dehydration or centrifugal dehydration, i.e. completion Sewage
The dehydration of mud；
When being dehydrated using plate compression, filters pressing pressure is 1MPa~2MPa, and time of filter pressing is 1.5h~4h, and filters pressing to filter press stops
Only draining can stop；
When using centrifugal dehydration, centrifugal force is 2500r/min~4500r/min, and centrifugation time is 7min~15min.
2. a kind of side for carrying out sewage sludge dehydration using the dense salt waste water of seawater desalination reverse osmosis according to claim 1
Method, it is characterised in that the bed mud after primary concentration is mixed in the duct with the dense salt waste water of seawater desalination reverse osmosis in step 2,
Then mixed liquor is transferred to sludge conditioning pond and carries out two-stage stirring.
3. a kind of side for carrying out sewage sludge dehydration using the dense salt waste water of seawater desalination reverse osmosis according to claim 1
Method, it is characterised in that the bed mud after primary concentration is mixed with the dense salt waste water of seawater desalination reverse osmosis in step 2, is then carried out
Two-stage stirring, first order mixing speed gradient are G1=18s-1, first order mixing time is 5min；Second level mixing speed gradient
G2=2s-1, second level mixing time is 45min.
4. a kind of side for carrying out sewage sludge dehydration using the dense salt waste water of seawater desalination reverse osmosis according to claim 1
Method, it is characterised in that when being dehydrated in step 4 according to plate compression, filters pressing pressure is 1MPa, and time of filter pressing 3h, filters pressing is extremely
Filter press, which stops draining, to be stopped.
5. a kind of side for carrying out sewage sludge dehydration using the dense salt waste water of seawater desalination reverse osmosis according to claim 1
Method, it is characterised in that when in step 4 according to centrifugal dehydration, centrifugal force 300r/min, centrifugation time 10min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3114249A1 (en) * | 2020-09-22 | 2022-03-25 | Pure Salmon Limited | Process for treating water for fish farming, and installation for implementing this process |
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|---|---|---|---|---|
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| CN102897986A (en) * | 2012-10-12 | 2013-01-30 | 常州大学 | Sludge dewatering method for marsh gas tank in pig farm |
| CN104176901A (en) * | 2014-09-08 | 2014-12-03 | 哈尔滨工业大学 | Earlier-stage conditioning method of sewage sludge |
| CN106277698A (en) * | 2016-08-26 | 2017-01-04 | 江苏理文造纸有限公司 | A kind of processing method of paper waste |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0649820A4 (en) * | 1992-07-04 | 1995-05-10 | ||
| CN101823826A (en) * | 2010-04-20 | 2010-09-08 | 上海大学 | Method for adjusting and treating municipal residual sludge by using salinferous brine or seawater |
| CN102897986A (en) * | 2012-10-12 | 2013-01-30 | 常州大学 | Sludge dewatering method for marsh gas tank in pig farm |
| CN104176901A (en) * | 2014-09-08 | 2014-12-03 | 哈尔滨工业大学 | Earlier-stage conditioning method of sewage sludge |
| CN106277698A (en) * | 2016-08-26 | 2017-01-04 | 江苏理文造纸有限公司 | A kind of processing method of paper waste |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| FR3114249A1 (en) * | 2020-09-22 | 2022-03-25 | Pure Salmon Limited | Process for treating water for fish farming, and installation for implementing this process |
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