CN106348570A - Sludge dewatering additive, and preparation process and application thereof in sludge dewatering - Google Patents
Sludge dewatering additive, and preparation process and application thereof in sludge dewatering Download PDFInfo
- Publication number
- CN106348570A CN106348570A CN201610978602.3A CN201610978602A CN106348570A CN 106348570 A CN106348570 A CN 106348570A CN 201610978602 A CN201610978602 A CN 201610978602A CN 106348570 A CN106348570 A CN 106348570A
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- CN
- China
- Prior art keywords
- sludge dewatering
- sludge
- additive
- flue gas
- dewatering
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- 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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- Engineering & Computer Science (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)
- Mechanical Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sludge dewatering additive, and a preparation process and application thereof in sludge dewatering. The sludge dewatering additive is composed of a solid flue gas desulfurization gypsum and sodium sulfate, wherein the sodium sulfate accounts for 1-5% of the solid flue gas desulfurization gypsum in mass. The preparation method comprises the following steps: sufficiently stirring and mixing the solid flue gas desulfurization gypsum and Na2SO4, and reacting for 2-3 hours to obtain the sludge dewatering additive. The application of the sludge dewatering additive in sludge dewatering is as follows: adding the sludge dewatering additive into biochemical sludge through a pipeline, wherein the addition of the sludge dewatering additive accounts for 10-20% of the solid content of the biochemical sludge; uniformly mixing; and performing dewatering treatment, wherein a plate and frame type filter press is used as a dewatering apparatus. The modified desulfurization gypsum is used to perform dewatering treatment on the sludge, so that waste can be fully utilized; and when the modified desulfurization gypsum is added into the sludge for dewatering treatment, the dewatering property of the biochemical sludge can be favorably improved, thus obviously enhancing the sludge dewatering effect.
Description
Technical field
The invention belongs to environmental technology field is and in particular to a kind of sludge dewatering additive and its preparation technology are taken off with mud
Water method.
Background technology
Moisture in mud is divided into four kinds by its existence: 1. Interstitial Water, and Interstitial Water is the trip that mud granule surrounds
From moisture, typically constitute from the 70% about of mud total moisture content；2. capillary water, capillary water is between mud granule or in particulate fractures
The moisture being combined together due to capillarity and mud granule, accounts for the 20% about of total Water；3. adsorb water, absorption water be by
In the moisture on mud granule surface for the capillary effect absorption, because mud granule is little, there are extremely strong superficial attractive forces；
4. combine water, be included in the moisture in microbial cell body in mud in conjunction with water, only change the internal structure of mud granule
Could separate in conjunction with water；Account for altogether 10% about of total moisture content in mud in conjunction with water and absorption water.
Biochemical sludge is because yield is big, mud component is complicated, moisture content is high, and mud colloidal solid is tiny, thus leading
Cause sludge dewatering difficult.They are extremely strong with the affinity of water, and Direct Dehydration will need substantial amounts of Assistant, and operating cost is high, and
Dewatering poor it is impossible to meet legal disposal requirement.Existing mechanical dehydration method has horizontal screw centrifugal method, belt filter pressing
Method, filter press method, folded spiral shell centrifuging etc., and their dehydration mass dryness fraction is 18 ~ 30%, all can not reach Sludge landfill mass dryness fraction 40%
Requirement.
For improving dewatering performance of sludge, improve mechanical dehydration effect, often need to change the physicochemical property of mud by quenched,
Reduce the affinity of colloidal solid and water, be that solid-liquid separation creates conditions.At present, the dewatering commonly used both at home and abroad is in biochemistry
Add quick lime to carry out in mud quenched, be then dehydrated using filter press method, its dehydration mass dryness fraction is up to 40%.But the party
In method, quick lime addition is too big, is 30 ~ 40%, and final mud and filter press water are in meta-alkalescence, and filter press water contains greatly
Amount calcium, longtime running can block pipeline, therefore the method is inadvisable, seldom applies at present.
Industrial furnace smoke desulfurization generally individually adopts the double alkali desulfurization of sodium calcium method, and its side-product is sulphuric acid after air oxidation
Calcium, i.e. desulfurated plaster, desulfurated plaster is usually used in construction material, but utilization rate is relatively low.At present, domestic and international sanitary sewage and Industry Waste
Water is most of to adopt biological treatment, and biochemical sludge general solid content after processed only has 20% about it is impossible to meet country
The cleaning landfill of 40% legal solid content requires.
Content of the invention
For problems of the prior art, the present invention provide a kind of sludge dewatering additive and its preparation technology with
Application in sludge dewatering.In the present invention, using modified desulfurized gesso of flue gas as the additive of sludge dewatering, not only expand
The purposes of desulfurized gesso of flue gas, and, desulfurized gesso of flue gas, as a kind of green resource of safety non-pollution, is added to mud
In will not be to environmental danger.Simultaneously as the unique property of desulfurized gesso of flue gas, use it for can also having during sludge dewatering
Beneficial to sludge dewatering.
For solving above-mentioned technical problem, the present invention employs the following technical solutions:
A kind of sludge dewatering additive, described sludge dewatering additive by solid desulfurized gesso of flue gas and accounts for solid cigarette QI prostration
The sodium sulfate composition of sulfur gypsum quality 1 ~ 5%, sodium sulfate is used for desulfurized gesso of flue gas is modified.
Described solid desulfurized gesso of flue gas is that the by-product of sodium calcium method flue gas desulfurization is made after air oxidation.
Described solid desulfurized gesso of flue gas is in relatively fine particle shape, and particle diameter is 10 ~ 20 m.
By solid desulfurized gesso of flue gas and na2so4React 2 ~ 3 hours after being thoroughly mixed, complete solid flue gas desulfurization stone
The modified of cream obtains sludge dewatering additive.
As follows using application in terms of sludge dewatering for the described sludge dewatering additive: by pipeline, sludge dewatering to be added
Plus agent is added in biochemical sludge, the addition of sludge dewatering additive is the 10 ~ 20% of biochemical sludge solids content, and mixing is all
Even, then carry out processed, the dehydration equipment of employing is plate and frame type filter-press.
The operating pressure of described plate and frame type filter-press is 0.6 ~ 1.0mpa.
Desulfurized gesso of flue gas is product after air oxidation for the flue gas desulfurization, is a kind of chemical by-product, is tied with single
Brilliant granule exists, and because desulfurated plaster is that chemical deposition is formed, the granularity of calcium sulfate is only 10 ~ 20 μm, assumes the portion of nanometer
Dtex is levied, as huge in surface area etc., has fabulous absorption property.Because in mud, capillary water is not easy to remove, the present invention will
Desulfurated plaster is modified, and increases the salinity of desulfurated plaster, because salting out makes capillary water in mud be easier to remove.This
Bright is that desulfurated plaster is modified to improve its performance, using its as sludge dewatering additive, and rely on existing mud take off
Hydraulic art and device and propose and apply.
Compared with prior art, the invention has the benefit that
(1) because the mud after dehydration is usually secondary use, so its safety is most important.In the present invention, by safety
Free of contamination modification desulfurated plaster, as the additive of sludge dewatering treatment, will not produce pollution to environment.
(2) using modified desulfurated plaster as the additive of sludge dewatering, not only expanded the purposes of desulfurized gesso of flue gas,
And sludge dewatering can also be conducive to, due to desulfurized gesso of flue gas grain structure closely, when mixing with mud, can change
Becoming the grain structure of mud, when being dehydrated, it is possible to reduce resistance, making water be easy to pass through, thus being conducive to the dehydration of mud.
Concrete principle is as follows: desulfurized gesso of flue gas crystalline solid is in the form of a column, and closely, hydration and hardening body has higher intensity to grain structure.When
Modified desulfurized gesso of flue gas is added to when being dehydrated in mud, and modified desulfurated plaster supply mud, with lattice framework, changes
Mud granule structure, increases permeability and the aperture rate of mud.When be added to carry out processed in mud when, be more beneficial for dirt
Water decomposition is combined, the release beneficial to moisture in mud is it is ensured that mud has preferable dehydrating effect in mud.
(3) present invention makes a kind of sludge dewatering additive using desulfurated plaster through modification, for biochemical sludge dehydration,
Using modified desulfurated plaster, processed is carried out to mud, waste can be made full use of, using the dehydration of common plate and frame type filter-press
Its solid content, i.e. up to 50 ~ 60%, reaches the purpose of the treatment of wastes with processes of wastes against one another, realizes waste's reclamation.
(4) mud dewatering method that the present invention provides is simple to operation, only need to add additive provided by the present invention
Fully mix in mud, you can play a role.Carry out sludge dewatering operation when, be mixed with described additive mud
Kernel structure changes, and is conducive to the dehydration of mud.
Specific embodiment
With reference to specific embodiment, the present invention will be further described.It should be understood that following examples are merely to illustrate this
Invention can make one according to the content of foregoing invention not for limiting the scope of the present invention, the person skilled in the art in this field
Nonessential improvement and adjustment a bit.
Embodiment 1
The preparation method of the sludge dewatering additive of the present embodiment is as follows:
Take the double alkali desulfurization of 100 kilograms of sodium calcium methods the desulfurized gesso of flue gas through air oxidation, add 1.2 kilograms of anhydrous sodium sulfates,
Stirring reaction 2 hours, obtains sludge dewatering additive.
The method carrying out sludge dewatering using the sludge dewatering additive of the present embodiment is as follows:
By pipeline, sludge dewatering additive is added in biochemical sludge, addition is the 10.2% of biochemical sludge solids content,
Mix homogeneously, is dehydrated in the filter press under 0.6mpa pressure, and the mud cake solids content finally giving is 52.0%.
Embodiment 2
The preparation method of the sludge dewatering additive of the present embodiment is as follows:
Take the double alkali desulfurization of 100 kilograms of sodium calcium methods the desulfurized gesso of flue gas through air oxidation, add 2.6 kilograms of anhydrous sodium sulfates,
Stirring reaction 2 hours, obtains sludge dewatering additive.
The method carrying out sludge dewatering using the sludge dewatering additive of the present embodiment is as follows:
Added by sludge dewatering additive in biochemical sludge by pipeline, addition is the 15.5% of biochemical sludge solids content,
Mix homogeneously, is dehydrated in the filter press under 0.8mpa pressure, and the mud cake solids content finally giving is 54.5%.
Embodiment 3
The preparation method of the sludge dewatering additive of the present embodiment is as follows:
Take the double alkali desulfurization of 100 kilograms of sodium calcium methods the desulfurized gesso of flue gas through air oxidation, add 4.8 kilograms of anhydrous sodium sulfates,
Stirring reaction 2 hours, obtains sludge dewatering additive.
The method carrying out sludge dewatering using the sludge dewatering additive of the present embodiment is as follows:
By pipeline, sludge dewatering additive is added in biochemical sludge, addition is the 19.8% of biochemical sludge solids content,
Mix homogeneously, is dehydrated in the filter press under 1.0mpa pressure, and the mud cake solids content finally giving is 59.0%.
Embodiment 4
The preparation method of the sludge dewatering additive of the present embodiment is as follows:
Take the double alkali desulfurization of 100 kilograms of sodium calcium methods the desulfurized gesso of flue gas (particle diameter is 10 ~ 20 m) through air oxidation, add 1 public affairs
Jin anhydrous sodium sulfate, stirring reaction 2.5 hours, obtain sludge dewatering additive.
The method carrying out sludge dewatering using the sludge dewatering additive of the present embodiment is as follows:
By pipeline, sludge dewatering additive is added in biochemical sludge, addition is the 20% of biochemical sludge solids content, mixes
Close uniformly, be dehydrated in the filter press under 1.0mpa pressure, the mud cake solids content finally giving is 58.4%.
Embodiment 5
The preparation method of the sludge dewatering additive of the present embodiment is as follows:
Take the double alkali desulfurization of 100 kilograms of sodium calcium methods the desulfurized gesso of flue gas (particle diameter is 10 ~ 20 m) through air oxidation, add 5 public affairs
Jin anhydrous sodium sulfate, stirring reaction 3 hours, obtain sludge dewatering additive.
The method carrying out sludge dewatering using the sludge dewatering additive of the present embodiment is as follows:
By pipeline, sludge dewatering additive is added in biochemical sludge, addition is the 10% of biochemical sludge solids content, mixes
Close uniformly, be dehydrated in the filter press under 0.9mpa pressure, the mud cake solids content finally giving is 59.2%.
Ultimate principle and principal character and the advantages of the present invention of the present invention have been shown and described above.The skill of the industry
The simply explanation it should be appreciated that the present invention is not restricted to the described embodiments, described in above-described embodiment and description for the art personnel
The principle of the present invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these
Changes and improvements both fall within scope of the claimed invention.Claimed scope by appending claims and
Its equivalent thereof.
Claims (6)
1. a kind of sludge dewatering additive it is characterised in that: described sludge dewatering additive by solid desulfurized gesso of flue gas with
And account for the sodium sulfate composition of solid flue gas desulfurization gypsum quality 1 ~ 5%.
2. sludge dewatering additive according to claim 1 it is characterised in that: described solid desulfurized gesso of flue gas is sodium
The by-product of calcium method flue gas desulfurization is made after air oxidation.
3. sludge dewatering additive according to claim 1 it is characterised in that: described solid desulfurized gesso of flue gas be in relatively
Fine particulate, particle diameter is 10 ~ 20 m.
4. the preparation method according to the arbitrary described sludge dewatering additive of claim 1 ~ 3 it is characterised in that: by solid flue gas
Desulfurated plaster and na2so4React 2 ~ 3 hours after being thoroughly mixed, complete the modified of solid desulfurized gesso of flue gas and obtain mud
Water-removal additive.
5. utilize application in terms of sludge dewatering for the arbitrary described sludge dewatering additive of claim 1 ~ 3 as follows: by pipe
Sludge dewatering additive is added in biochemical sludge in road, and the addition of sludge dewatering additive is biochemical sludge solids content
10 ~ 20%, mix homogeneously, then carry out processed, the dehydration equipment of employing is plate and frame type filter-press.
6. sludge dewatering additive according to claim 5 carry out sludge dewatering method it is characterised in that: described sheet frame
The operating pressure of formula pressure filter is 0.6 ~ 1.0mpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610978602.3A CN106348570A (en) | 2016-11-08 | 2016-11-08 | Sludge dewatering additive, and preparation process and application thereof in sludge dewatering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610978602.3A CN106348570A (en) | 2016-11-08 | 2016-11-08 | Sludge dewatering additive, and preparation process and application thereof in sludge dewatering |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106348570A true CN106348570A (en) | 2017-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610978602.3A Pending CN106348570A (en) | 2016-11-08 | 2016-11-08 | Sludge dewatering additive, and preparation process and application thereof in sludge dewatering |
Country Status (1)
| Country | Link |
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| CN (1) | CN106348570A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110255857A (en) * | 2019-05-28 | 2019-09-20 | 路德环境科技股份有限公司 | Low alkali conditioner and dewatering for construction slurry deep dehydration |
| CN117023944A (en) * | 2023-10-08 | 2023-11-10 | 杭州尚善若水环保科技有限公司 | Sludge mixing dehydration method in LCD manufacturing industry |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102267795A (en) * | 2011-06-17 | 2011-12-07 | 中国科学院武汉岩土力学研究所 | Dewatered sludge drying method of wastewater treatment plant |
| CN102849918A (en) * | 2012-10-09 | 2013-01-02 | 浙江大学 | Treatment method for strengthening dewatering performance of excess activated sludge |
-
2016
- 2016-11-08 CN CN201610978602.3A patent/CN106348570A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102267795A (en) * | 2011-06-17 | 2011-12-07 | 中国科学院武汉岩土力学研究所 | Dewatered sludge drying method of wastewater treatment plant |
| CN102849918A (en) * | 2012-10-09 | 2013-01-02 | 浙江大学 | Treatment method for strengthening dewatering performance of excess activated sludge |
Non-Patent Citations (2)
| Title |
|---|
| 刑奕等: ""脱硫灰调理对污泥脱水性能的影响"", 《化工学报》 * |
| 陈巍等: ""脱硫灰-FeCl3联合作用改善污泥的脱水性能"", 《工程科学学报》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110255857A (en) * | 2019-05-28 | 2019-09-20 | 路德环境科技股份有限公司 | Low alkali conditioner and dewatering for construction slurry deep dehydration |
| CN117023944A (en) * | 2023-10-08 | 2023-11-10 | 杭州尚善若水环保科技有限公司 | Sludge mixing dehydration method in LCD manufacturing industry |
| CN117023944B (en) * | 2023-10-08 | 2024-01-23 | 杭州尚善若水环保科技有限公司 | Sludge mixing dehydration method in LCD manufacturing industry |
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Application publication date: 20170125 |
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