CN109368985A - A kind of mud dewatering method - Google Patents
A kind of mud dewatering method Download PDFInfo
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- CN109368985A CN109368985A CN201811603554.5A CN201811603554A CN109368985A CN 109368985 A CN109368985 A CN 109368985A CN 201811603554 A CN201811603554 A CN 201811603554A CN 109368985 A CN109368985 A CN 109368985A
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- Prior art keywords
- sludge
- dewatering method
- mud dewatering
- mud
- conditioner
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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
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (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)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to technical field of sludge treatment, specifically disclose a kind of mud dewatering method, and sludge and conditioner M are carried out pre-reaction；Then to adding flocculant in pre-reaction system and carrying out hydro-thermal reaction in confined conditions, most it is separated by solid-liquid separation afterwards, recycles water therein, obtain dewatered sludge；The conditioner M includes industrial residue and activator.Content of beary metal is lower in removing moisture in the method for the present invention sludge, realizes the innoxious and minimizing of sludge.
Description
Technical field
The present invention relates to a kind of methods of sludge dewatering, belong to sludge reduction process field.
Background technique
Since last decade, China has become municipal sludge and generates big country, sludge annual output rapid growth.In addition, with " ten
Three or five " implementation planned, all parts of the country will build up more sewage treatment plants, it is contemplated that excess sludge year yield be up to
60000000 tons.Due to sludge it is unstable, it is easy corruption, foul smelling smell, and in addition to contain organic matter and nitrogen difficult to degrade, phosphorus etc.
Outside nutriment, it to be a semisolid pollution difficult to deal with that there is also the biological pollution sources such as heavy metal, pathogenic bacteria and helminth
Object.Therefore, sludge must be dealt carefully with and be disposed, and otherwise will destroy public environment, and jeopardize human health, influence social hair
Exhibition, brings serious secondary pollution problem.
Treatment of Sludge and the basic principle of disposition are to make its minimizing, stabilisation and innoxious, and realize its money as far as possible
Source, municipal sludge processing have become the major issue that current limitation Biochemical method sewage develops in a healthy way.Currently, sludge dewatering
The main method of minimizing is heat drying method and cold conditions dehydration.Heat drying is evaporated sludge water content using offer external source thermal energy
Treatment process, this method have the advantages that certain in terms of sludge reduction and stabilisations, are current international more universal
Sludge drying technique, but heat drying project investment is larger, energy consumption is high, the device is complicated, continuous and steady operation is more difficult；Cold conditions is de-
Water is broadly divided into alkalinity dehydration and deep dehydration, and alkalinity dehydration is that the substances such as lime are added using iron chloride to be improved, then
Press dewatering, since additional solid matter is more, although the moisture content of sludge decreases after desiccation, but effect is not
It is fairly obvious.Deep dehydration technology is to change moisture existence form in sludge by the way that sludge conditioning medicament is added, will be in sludge
A kind of New Type of Sludge Dewatering Decrement Technique that moisture separates in liquid form.
There is still a need for raisings for the dehydrating effect and heavy metal passivation effect of existing mud dewatering method.
Summary of the invention
To solve the problems, such as lower higher, the mesh of the present invention with content of beary metal in moisture after sludge dewatering of sludge dewatering degree
Be, provide a kind of municipal sludge deep dehydration method, it is intended to the water effectively in removing sludge, and a fixed huge sum of money therein
Belong to, avoids the water outlet of recycling and the heavy metal secondary pollution of sludge.
Sludge and conditioner M are carried out pre-reaction by a kind of mud dewatering method；It flocculates then to being added in pre-reaction system
Agent simultaneously carries out hydro-thermal reaction in confined conditions, is most separated by solid-liquid separation afterwards, recycles water therein, obtain dewatered sludge；
The conditioner M includes industrial residue and activator.
The present invention in advance by sludge and conditioner M pre-reaction, then again innovatively be added with flocculant under conditions of into
Row hydro-thermal reaction so facilitates the degree of dehydration for promoting sludge, moreover, moreover it is possible to the heavy metal in effectively fixed sludge,
Avoid the heavy metal pollution of the water and remaining dewatered sludge of removing.The method of the present invention effectively improves the dewatering of sludge and blunt
Change Heavy Metals in Sludge, both solved dewatered sludge handling problems, removing moisture heavy metals exceeding standard in sludge can also be effectively reduced
Problem.
Sludge is carried out hydrothermal modification in a mild condition again after the pre-reaction by the present invention, in this way, effectively mentioning
High dewatering performance of sludge, and realize moisture in sludge further separate with the passivation of heavy metal, the study found that side of the present invention
The moisture content of method treated sludge (dehydrated sludge) can be reduced to 35%, and have and invest that smaller, operating cost is low, effective
The advantages that avoiding secondary pollution.
The sludge is municipal sludge.Its water content is not less than 80%；Preferably 90-95%.
The study found that carrying out pretreatment to sludge in advance using the conditioner M of the ingredient is to guarantee follow-up hydrothermal dehydration
The key of effect and heavy metal passivation effect.
Preferably, the industrial residue includes slag, phosphorus slag, flyash liquid slag, at least one in boiling furnace slag
Kind.
The activator is sulphite, triethanolamine, sodium acetate, lignosulfonic acid, Na2CO3、NaOH、KOH、KAl
(SO4)2·12H2O、KNO2、NaF、CaSO4At least one of.
In conditioner M, industrial residue, activator weight ratio be 80-100:5-20.
The present invention, the conditioner M are a kind of widely used novel slag cementitious materials, and primary raw material (accounts for 80%
More than) it is industrial residue, including slag, phosphorus slag, flyash liquid slag, boiling furnace slag etc., in addition it is equipped with a certain proportion of activation
Agent mixing is ground.And the material has excellent solidification, dewatering, and need not rinse and sieve.
Preferably, the dosage of the conditioner M is the 5-15% of sludge (sludge is in terms of weight in wet base) weight；Into
One step is preferably 8-15%.It is preferred that can further promote sludge dewatering effect and heavy metal passivation effect under dosage.
Pre-reaction carries out under stiring.
Preferably, the time of pre-reaction is 0.5-2h.
Pre-reaction process can carry out at room temperature, and preferred temperature is 10-40 DEG C.
The present inventor's research has been surprisingly found that the opportunity for adding flocculant has hydro-thermal dehydration and heavy metal passivation effect
It influences, adds flocculant into pretreated system, can cooperate with and promote follow-up hydrothermal sludge dewatering effect, moreover,
The content of Heavy Metals in Sludge can be also effectively fixed, the heavy metal of content of beary metal and dewatered sludge that water outlet is effectively reduced is secondary
Pollution.
Preferably, flocculant is FeCl3、FeSO4、Al2(SO4)3、Fe2(SO4)3At least one of.
Further preferably, flocculant FeCl3.The study found that using FeCl3It is de- unexpectedly can further to promote hydro-thermal
Water effect, and further help in the pollution of sludge heavy-metal.
Preferably, the dosage of flocculant is the 2-8% of sludge (in terms of weight in wet base) weight；Preferably 4-6%.Preferred scope
It is more conducive to sludge dewatering down, moreover, moreover it is possible to promote heavy metal passivation effect, the sludge that is further effectively reduced that treated
The content of beary metal of heavy metal secondary pollution and water outlet.
It is the key that realize that dehydration and heavy metal are passivated using hydro-thermal reaction in the present invention.Preferably, hydro-thermal reaction
Temperature is 80-185 DEG C；Preferably 90-145 DEG C；It is still more preferably 105-120 DEG C.It, can be into one under preferred range
Step promotes dehydrating effect, further promotes heavy metal passivation effect in addition, additionally aiding.
Preferably, the hydro-thermal reaction time is 0.1-0.5h.
Hydro-thermal reaction system is separated by solid-liquid separation, separates water therein, solid portion is that treated dewatered sludge.Solid-liquid
Existing means can be used in separation, such as filter.
A kind of preferred mud dewatering method of the present invention, the specific steps are as follows:
(1) the former mud that moisture content is 90%-95% is delivered to conditioning kettle, and conditioning medicament M is added, under agitation
Pre-reaction 0.5-2h；
(2) kettle treated sludge pump is transported to hydrothermal modification conditioning kettle after conditioning, adds and modified improves medicament
FeCl3, hydrothermal temperature is 80-185 DEG C, is stirred to react 0.1-0.5h；
(3) hydrothermal modification is improved into sludge in kettle with screw pump and is delivered to membrane pressure filter filter-press dehydration, isolate dirt
Moisture in mud；
(4) sludge enters membrane pressure filter 0.2-1.5h, is carried out with compressed air or pressure (hydraulic) water to the diaphragm of filter press
Pressurization obtains the dry mud of dehydration that moisture content is 35-40%；
(5) mud cake after dehydration is transported to dry mud storehouse finally by transmission device.
In the present invention, the pretreatment of the conditioner M of the composition proportion plays skeletal support and building composite flocculation body
Effect, effectively improve mechanical dehydration ability, further coordinated flocculant and the hydro-thermal process means of sludge, can be with
Effectively collaboration promotes dehydrating effect, moreover, can also fix the heavy metal in sludge, reduce water outlet content of beary metal and
The heavy metal secondary pollution of dewatered sludge.
The application compared with prior art, at least has following obvious advantage and effect:
(1) water content can be down to 35% from 90% or more to sludge after processing；Dehydrating effect is excellent；
(2) deep dehydration under temperate condition to sludge is realized, and dewatered sludge can be used for burning, produce water
Mud, brickmaking or landfill stabilization；
(3) it is lower that content of beary metal in moisture is removed in sludge, and operating cost is low, realizes the innoxious of sludge and subtracts
Quantization.
Detailed description of the invention
Fig. 1 is the moisture content figure of mud cake in 1-3 of the embodiment of the present invention and comparative example 1-4.
Fig. 2 is that sludge removes content of beary metal datagram in moisture in 1-3 of the embodiment of the present invention and comparative example 1-4.
Specific embodiment
To facilitate the understanding of the present invention, the present invention is done below in conjunction with Figure of description and preferred embodiment more complete
Face meticulously describes, but protection scope of the present invention is not limited to following specific embodiments.
Embodiment 1
A kind of mild hydrothermal modification dewatering of sludge of the invention, raw material are as follows: municipal sludge, conditioning medicament M and modification
Medicament FeCl3.Specific step is as follows:
(1) raw sewage (moisture content 92wt.%) for being derived from Wuhan San Jintan sewage treatment plant is delivered to conditioning kettle, and
Conditioning medicament M is added, and (wherein, phosphorus slag, slag and boiling furnace slag that industrial residue is 1:12:4 containing mass ratio, activator is quality
Than the Na for 8:1:4:72CO3、NaOH、KAl(SO4)2·12H2O and CaSO4；The mass ratio of industrial residue and activator is 85:
10), the additional amount of conditioner M is the 8wt.% of sludge quantity, reacts 1h under agitation；
(2) kettle treated sludge pump is transported to hydrothermal modification conditioning kettle after conditioning, adds and modified improves medicament
FeCl3, additional amount is the 4wt.% of sludge quantity, and hydrothermal temperature is 105 DEG C, is stirred to react 0.5h；
(3) hydrothermal modification is improved into sludge in kettle with screw pump and is delivered to membrane pressure filter filter-press dehydration, isolate dirt
Moisture in mud；
(4) sludge enters membrane pressure filter 0.5h, is pressurizeed with compressed air or pressure (hydraulic) water to the diaphragm of filter press,
It obtains being dehydrated dry mud；
(5) mud cake after dehydration is transported to dry mud storehouse finally by transmission device.
Embodiment 2
A kind of mild hydrothermal modification dewatering of sludge of the invention, raw material are as follows: municipal sludge, conditioning medicament M and modification
Medicament FeCl3.Specific step is as follows:
(1) raw sewage (moisture content 92wt.%) for being derived from Wuhan San Jintan sewage treatment plant is delivered to conditioning kettle, and
Conditioning medicament M (wherein, phosphorus slag, slag and boiling furnace slag that industrial residue is 1:12:4 containing mass ratio is added；Activator is quality
Than the Na for 8:1:4:72CO3、NaOH、KAl(SO4)2·12H2O and CaSO4；The mass ratio of industrial residue and activator is 85:
10), the additional amount of conditioner M is the 15wt.% of sludge quantity, reacts 1.5h under agitation；
(2) kettle treated sludge pump is transported to hydrothermal modification conditioning kettle after conditioning, adds and modified improves medicament
FeCl3, additional amount is the 4wt.% of sludge quantity, and hydrothermal temperature is 120 DEG C, is stirred to react 0.3h；
(3) hydrothermal modification is improved into sludge in kettle with screw pump and is delivered to membrane pressure filter filter-press dehydration, isolate dirt
Moisture in mud；
(4) sludge enters membrane pressure filter 0.8h, is pressurizeed with compressed air or pressure (hydraulic) water to the diaphragm of filter press,
It obtains being dehydrated dry mud；
(5) mud cake after dehydration is transported to dry mud storehouse finally by transmission device.
Embodiment 3
A kind of mild hydrothermal modification dewatering of sludge of the invention, raw material are as follows: municipal sludge, conditioning medicament M and modification
Medicament FeCl3.Specific step is as follows:
(1) raw sewage (moisture content 92wt.%) for being derived from Wuhan San Jintan sewage treatment plant is delivered to conditioning kettle, and
Conditioning medicament M (wherein, phosphorus slag, slag and boiling furnace slag that industrial residue is 1:12:4 containing mass ratio is added；Activator is quality
Than the Na for 8:1:4:72CO3、NaOH、KAl(SO4)2·12H2O and CaSO4；The mass ratio of industrial residue and activator is 85:
10), the additional amount of conditioner M is the 2wt.% of sludge quantity, reacts 1h under agitation；
(2) kettle treated sludge pump is transported to hydrothermal modification conditioning kettle after conditioning, adds and modified improves medicament
FeCl3, additional amount is the 2wt.% of sludge quantity, and hydrothermal temperature is 135 DEG C, is stirred to react 0.4h；
(3) hydrothermal modification is improved into sludge in kettle with screw pump and is delivered to membrane pressure filter filter-press dehydration, isolate dirt
Moisture in mud；
(4) sludge enters membrane pressure filter 0.5h, is pressurizeed with compressed air or pressure (hydraulic) water to the diaphragm of filter press,
It obtains being dehydrated dry mud；
(5) mud cake after dehydration is transported to dry mud storehouse finally by transmission device.
Comparative example 1
It is compared with embodiment 1, difference is only that, conditioning medicament M, remaining pretreatment mode and mistake are not added in step (1)
Journey parameter remains unchanged.
Comparative example 2
It is compared with embodiment 2, difference is only that, modified conditioning medicament FeCl is not added in step (2)3, remaining pretreatment
Mode and procedure parameter remain unchanged.
Comparative example 3
It is compared with embodiment 3, difference is only that, does not carry out hydro-thermal process (i.e. open), remaining pretreatment side in step (2)
Formula and procedure parameter remain unchanged.
Comparative example 4
It is compared with embodiment 1, difference is only that, modified conditioning medicament FeCl is added in step (1)3, in step (2) not
Modified conditioning medicament FeCl is added again3, remaining processing mode and procedure parameter remain unchanged.
Content of beary metal in sludge removing moisture is measured and with reference to state referring to national standard (GB3838-2002)
Family's standard (GB7172-1987) is measured the moisture content of mud cake.Mud cake is aqueous in embodiment 1-3 and comparative example 1-4
Content of beary metal difference is as depicted in figs. 1 and 2 in rate and sludge removing moisture, and data value is shown in Table 1.
Table 1
It to sum up analyzes, is pre-processed using conditioner M of the present invention, then the hydro-thermal under flocculant again, it can be with
The dehydration rate of sludge is effectively promoted, moreover, additionally aids the content for reducing the heavy metal of water outlet.
Research also found that the 8-15% by the conditioner M relative to wet mud weight, flocculant is relative to wet mud
The 4-6% of weight, and under 105-120 DEG C of hydrothermal condition, dewatering rate can be further promoted, a huge sum of money is further improved
Belong to passivation effect.
Claims (10)
1. a kind of mud dewatering method, which is characterized in that sludge and conditioner M are carried out pre-reaction；Then to pre-reaction system
Middle addition flocculant simultaneously carries out hydro-thermal reaction in confined conditions, is most separated by solid-liquid separation afterwards, recycles water therein, and dry dirt is obtained
Mud；
The conditioner M includes industrial residue and activator.
2. mud dewatering method as described in claim 1, which is characterized in that the industrial residue includes slag, phosphorus slag, powder
At least one of coal ash liquid slag, boiling furnace slag；
Preferably, the activator is sulphite, triethanolamine, sodium acetate, lignosulfonic acid, Na2CO3、NaOH、KOH、KAl
(SO4)2·12H2O、KNO2、NaF、CaSO4At least one of.
3. mud dewatering method as described in claim 1, which is characterized in that in conditioner M, the weight of industrial residue, activator
Amount is than being 80-100:5-20.
4. mud dewatering method as claimed in any one of claims 1 to 3, which is characterized in that the dosage of the conditioner M is
The 5-15% of sludge weight；Preferably 8-15%.
5. mud dewatering method as claimed in any one of claims 1 to 3, which is characterized in that pre-reaction carries out under stiring, instead
It is 0.5-2h between seasonable.
6. mud dewatering method as described in claim 1, which is characterized in that flocculant FeCl3、FeSO4、Al2(SO4)3、
Fe2(SO4)3At least one of.
7. mud dewatering method as claimed in claim 6, which is characterized in that the dosage of flocculant is the 2-8% of sludge weight；
Preferably 4-6%.
8. mud dewatering method as described in claim 1 or 6, which is characterized in that hydrothermal temperature is 80-185 DEG C；It is preferred that
It is 105-120 DEG C.
9. mud dewatering method as described in claim 1, which is characterized in that the hydro-thermal reaction time 0.1-0.5h.
10. mud dewatering method as described in claim 1, which is characterized in that the sludge is excess sludge；
Preferably, the water content of sludge is not less than 80%.
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| CN201811603554.5A CN109368985B (en) | 2018-12-26 | 2018-12-26 | Sludge dewatering method |
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| CN201811603554.5A CN109368985B (en) | 2018-12-26 | 2018-12-26 | Sludge dewatering method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109867450A (en) * | 2019-03-30 | 2019-06-11 | 肇庆市珈旺环境技术研究院 | Sludge incineration ash cement and preparation and application thereof |
| CN109928593A (en) * | 2019-03-26 | 2019-06-25 | 江苏大学 | A kind of method of sludge pyrohydrolysis coupling framework material depth |
| CN110981157A (en) * | 2019-12-30 | 2020-04-10 | 肇庆市武大环境技术研究院 | Method for efficiently reducing and harmlessly treating sludge |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109928593A (en) * | 2019-03-26 | 2019-06-25 | 江苏大学 | A kind of method of sludge pyrohydrolysis coupling framework material depth |
| CN109928593B (en) * | 2019-03-26 | 2022-05-03 | 江苏大学 | Method for deep dehydration of sludge hot water decoupling combined framework material |
| CN109867450A (en) * | 2019-03-30 | 2019-06-11 | 肇庆市珈旺环境技术研究院 | Sludge incineration ash cement and preparation and application thereof |
| CN109867450B (en) * | 2019-03-30 | 2022-04-22 | 肇庆市珈旺环境技术研究院 | Sludge incineration ash cement and preparation and application thereof |
| CN110981157A (en) * | 2019-12-30 | 2020-04-10 | 肇庆市武大环境技术研究院 | Method for efficiently reducing and harmlessly treating sludge |
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