CN102961921A - Sludge dewatering technology for secondary sedimentation tank - Google Patents
Sludge dewatering technology for secondary sedimentation tank Download PDFInfo
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- CN102961921A CN102961921A CN2012105322765A CN201210532276A CN102961921A CN 102961921 A CN102961921 A CN 102961921A CN 2012105322765 A CN2012105322765 A CN 2012105322765A CN 201210532276 A CN201210532276 A CN 201210532276A CN 102961921 A CN102961921 A CN 102961921A
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- mud
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- dewatering
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- dewatering technology
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Abstract
The invention belongs to the field of water treatment and particularly relates to a sludge dewatering technology for a secondary sedimentation tank. The sludge dewatering technology aims at maximally reducing the water content in sludge. The sludge dewatering technology comprises the steps of firstly digesting the sludge of the secondary sedimentation tank in a digestion tank, carrying out concentration, and adding 10-15 ppm of cationic polyacrylamide to carry out primary dewatering; pumping the sludge after primary dewatering into a centrifugal separator by a pump to carry out secondary dewatering; and pumping the sludge after secondary dewatering into a steam pressure filter by the pump to carry out last dewatering, thus obtaining the sludge with a water content being lower than 10%. The sludge dewatering technology has the advantages of short process flow, low energy consumption, no pollution, operation simpleness and the like, thus having a very high popularization value.
Description
Technical field
The invention belongs to water treatment field, particularly a kind of second pond dewatering technology of mud.
Background technology
Second pond Treatment of Sludge and disposal are the new problems in the sewage disposal process.The adhesion of sludge water and sewage sludge solid particle is very strong, if there is not sludge conditioning in advance, namely carries out preliminary treatment by chemistry, physics, thermal technology's method, and then most sludge dewaterings are very difficult.The intensity of the size that the factor concentrated and dewatering that affects mud mainly is particle, surface charge, hydration and intergranular interaction etc., wherein granular size is the greatest factor that affects dewatering performance of sludge.Because mud granule is less, specific area larger (be index law increase) shows hydration intensity that it is higher and to the larger resistance of dewatering and filtering, changing dewatering needs more chemical agent.Mud contains more colloidal solids (being that the content of organic matter is higher), the more difficult dehydration of mud in addition.Particle mostly mutually repels in the mud, because of aquation, have one deck water to invest particle surface and obstacle particle mutually combine, and mud granule is generally electronegative, mutually repels, and has formed stable dispersity.Overcome aquation and electric exclusion effect, increase the size of mud granule, neutralization electrically allows adsorbed water discharge, to improve the concentrated and dewatering of mud.Method has: (1) is taken off surely, is condensed, take off and surely rely on coagulant such as adding organic flocculant, inorganic salts in the mud, make mud form that particle is large, hole many and the strong filter cake of structure, inorganic conditioner has ferric trichloride, alchlor, aluminum sulfate, polymeric aluminum, lime etc., organic conditioner has polypropylene phthalein amine etc., inorganic conditioner is cheap and easy to get, but consumption is large, the impact of pH value is large, organic conditioner then in contrast, integrated application 2-3 kind inorganic conditioner and organic flocculant mix and batch or batch successively, can improve usefulness; (2) improve intergranular structure, reduce filtration resistance, make not blocking filtering medium (filter cloth), inorganic sediment or inserts be thing for this reason just.
Chemically stable is to add chemical agent in mud, to suppress and kill microorganisms, eliminate the harm (producing stench and communicate illness) that mud may cause environment, the general method that adopts has: (1) lime stabilization makes the pH of mud bring up to 11-11.5 with lime, the a large amount of heat energy that utilize strong basicity and lime to emit are killed pathogen, are reduced stench and heavy metal-passivated, the quantity of slag that adopts milk of lime to produce is large, can increase not tractable remaining mud volume; (2) chlorine stabilization method chlorine energy kill pathogens longer stability is arranged, but pH is low, and filterability is poor, and the poisonous chloramines of normal generation in the chlorination process, brings certain difficulty for follow-up disposal.
Summary of the invention
The objective of the invention is at utmost to reduce moisture content in the mud, a kind of second pond dewatering technology of mud is provided.
Technical process of the present invention is:
(1) second pond mud is digested through digester first, concentrated, the PAMC that adds 10～15ppm carries out preliminary hydro-extraction;
(2) mud after the preliminary hydro-extraction is squeezed into centrifugal separator with pump and is carried out second dehydration;
(3) mud behind the second dehydration is squeezed into the vapour pressure filter with pump and is dewatered at last, can obtain moisture content at the mud below 10%.
Described vapour pressure filter is to press mud equipment with steam as the plate and frame of power; The vapour pressure operating pressure is 3～10MPz during work, and temperature is 110～260 ℃.
Described steam pressure machine sheet frame adopts the polytetrafluoroethylene (PTFE) synthesis of polymer material, the uniform salient point of distribution density on the plate face, and under steam pressure and temperature, the moisture content in salient point extruding and the roasting mud reaches the purpose that at utmost reduces moisture content in the mud.
The invention has the beneficial effects as follows: have the technological process weak point, energy consumption is low, and is pollution-free, and simple operation and other advantages has very high promotional value.
The specific embodiment
Embodiment 1
First through digester digestion, concentrated, the PAMC that adds 10ppm carries out preliminary hydro-extraction second pond mud; Mud after the preliminary hydro-extraction is squeezed into centrifugal separator with pump and is carried out second dehydration; Mud behind the second dehydration is squeezed into the vapour pressure filter with pump and is dewatered at last, and the vapour pressure operating pressure is 3MPz, and temperature is 110 ℃, can obtain the mud of moisture content 10%.
Embodiment 2
First through digester digestion, concentrated, the PAMC that adds 13ppm carries out preliminary hydro-extraction second pond mud; Mud after the preliminary hydro-extraction is squeezed into centrifugal separator with pump and is carried out second dehydration; Mud behind the second dehydration is squeezed into the vapour pressure filter with pump and is dewatered at last, and the vapour pressure operating pressure is 6MPz, and temperature is 180 ℃, can obtain the mud of moisture content 8%.
Embodiment 3
First through digester digestion, concentrated, the PAMC that adds 15ppm carries out preliminary hydro-extraction second pond mud; Mud after the preliminary hydro-extraction is squeezed into centrifugal separator with pump and is carried out second dehydration; Mud behind the second dehydration is squeezed into the vapour pressure filter with pump and is dewatered at last, and the vapour pressure operating pressure is 10MPz, and temperature is 260 ℃, can obtain the mud of moisture content 7%.
Claims (3)
1. second pond dewatering technology of mud is characterized in that:
(1) second pond mud is digested through digester first, concentrated, the PAMC that adds 10～15ppm carries out preliminary hydro-extraction;
(2) mud after the preliminary hydro-extraction is squeezed into centrifugal separator with pump and is carried out second dehydration;
(3) mud behind the second dehydration is squeezed into the vapour pressure filter with pump and is dewatered at last, can obtain moisture content at the mud below 10%.
2. described a kind of second pond dewatering technology of mud according to claim 1, it is characterized in that: described vapour pressure filter is to press mud equipment with steam as the plate and frame of power; The vapour pressure operating pressure is 3～10MPz during work, and temperature is 110～260 ℃.
3. described a kind of second pond dewatering technology of mud according to claim 2, it is characterized in that: described steam pressure machine sheet frame adopts the polytetrafluoroethylene (PTFE) synthesis of polymer material, the uniform salient point of distribution density on the plate face, under steam pressure and temperature, moisture content in salient point extruding and the roasting mud reaches the purpose that at utmost reduces moisture content in the mud.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105322765A CN102961921A (en) | 2012-12-11 | 2012-12-11 | Sludge dewatering technology for secondary sedimentation tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105322765A CN102961921A (en) | 2012-12-11 | 2012-12-11 | Sludge dewatering technology for secondary sedimentation tank |
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| Publication Number | Publication Date |
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| CN102961921A true CN102961921A (en) | 2013-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN2012105322765A Pending CN102961921A (en) | 2012-12-11 | 2012-12-11 | Sludge dewatering technology for secondary sedimentation tank |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110156243A (en) * | 2018-01-31 | 2019-08-23 | 北京建筑大学 | A kind of country sewage biology-ecological assemblage processing system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1880240A (en) * | 2005-06-17 | 2006-12-20 | 富士施乐株式会社 | Wastewater treatment process |
| CN101381134A (en) * | 2008-10-13 | 2009-03-11 | 山东大学 | Sewage disposal technique of stone processing and system |
| CN102161560A (en) * | 2011-04-28 | 2011-08-24 | 宜兴能达环保科技有限公司 | Method and device for dehydrating sludge in sewage treatment plant |
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2012
- 2012-12-11 CN CN2012105322765A patent/CN102961921A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1880240A (en) * | 2005-06-17 | 2006-12-20 | 富士施乐株式会社 | Wastewater treatment process |
| CN101381134A (en) * | 2008-10-13 | 2009-03-11 | 山东大学 | Sewage disposal technique of stone processing and system |
| CN102161560A (en) * | 2011-04-28 | 2011-08-24 | 宜兴能达环保科技有限公司 | Method and device for dehydrating sludge in sewage treatment plant |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110156243A (en) * | 2018-01-31 | 2019-08-23 | 北京建筑大学 | A kind of country sewage biology-ecological assemblage processing system |
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Application publication date: 20130313 |