CN101265011A - Application of discarded alkali slag/alkali liquid in activated sludge dehydration - Google Patents
Application of discarded alkali slag/alkali liquid in activated sludge dehydration Download PDFInfo
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- CN101265011A CN101265011A CNA2008100735515A CN200810073551A CN101265011A CN 101265011 A CN101265011 A CN 101265011A CN A2008100735515 A CNA2008100735515 A CN A2008100735515A CN 200810073551 A CN200810073551 A CN 200810073551A CN 101265011 A CN101265011 A CN 101265011A
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- alkali
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- activated sludge
- slag
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Abstract
The invention discloses an application of waste caustic sludge/caustic liquid in activated sludge dewatering. The application method comprises the steps of adding calcium oxide and waste caustic sludge/caustic liquid into sewage with separated sludge and water, stirring, standing for 5-10 min to allow the activated sludge to be separated from water, wherein the dry basis weight ratio of the activated sludge, calcium oxide and waste caustic sludge/caustic liquid is 40:(3-10):(3-20). The inventive method has the advantages of low treatment cost, high sludge dewatering efficiency, and good stability; and the dewatered sludge can be used for producing fertilizer.
Description
Technical field:
The present invention relates to solvay soda process and make the application of the discarded alkali slag/alkali liquid that produces in the soda industry, specifically is the application of discarded alkali slag/alkali liquid in activated sludge dehydration.
Background technology:
The processing of sludge sewage is the work that a workload is big, difficulty is also big.Sewage work adopts flocculation agent or the next additive as activated sludge dehydration of polymeric flocculant that iron is, aluminium is the master more at present, but it is big and cause the processing cost height that these flocculation agents are used for the processed ubiquity consumption of active sludge, problems such as the big and treatment effect instability of mud extraction heavy metal content.The external in addition flocculation agent that also has report to utilize magnesium salts, zinc salt etc. to handle as sewage sludge, domestic have producer to utilize lime and iron(ic) chloride to unite active sludge to be produced flocculate separate muddy water.Utilizing industrial alkali waste slag/alkali lye to handle active sludge separation muddy water does not appear in the newspapers as yet.
Summary of the invention:
The objective of the invention is the application of open industrial waste alkali slag/alkali liquid in activated sludge dehydration, it is a kind of treatment of wastes with processes of wastes against one another, and processing cost is low, the mud dewatering method that sludge dewatering is effective.
The application of discarded alkali slag/alkali liquid of the present invention in activated sludge dehydration, earlier calcium oxide being joined sewage work needs to stir evenly in the sewage of mud-water separation, adds the depleted alkali slag/alkali liquid then and also stirs, and leaves standstill 5～10/min, make the active sludge mud-water separation in the sewage, precipitate.Send into the plate-and-frame filter press press filtration afterwards, pressure 0.2～1Mpa, pressurize 60～120/min, mud extraction water ratio 50.3%～65%.
The amount of active sludge, calcium oxide, waste soda residue/alkali lye will make active sludge: calcium oxide: the butt weight ratio of alkali slag/alkali liquid is 40: 3～10: 3～20:, optimal value is 40: 6～10: 12～16.
Principle of the present invention:
The alkali slag/alkali liquid that produces in the soda ash manufacturing processed contains a large amount of lime carbonate and a certain amount of calcium hydroxide and magnesium hydroxide, the metal hydroxides colloid surface has positive charge, and the active sludge colloid surface has certain negative charge, and the strong alkaline condition that adds a large amount of calcium hydroxides outside with the calcium hydroxide and the magnesium hydroxide colloid of a certain amount of positive charge in the alkali lye makes the flocculation of active sludge colloid fine particle thing with electronegative active sludge by coagulation down.
Advantage of the present invention:
The present invention uses calcium oxide, discarded alkali slag/alkali liquid makes the active sludge mud-water separation in the sewage, and processing cost is low, sludge dewatering efficient height, good stability, mud extraction heavy metal content are low, realize the utilizing again to reach the purpose of the treatment of wastes with processes of wastes against one another of discarded alkali slag; Required elements of plant-growth such as the calcium in the alkaline residue, magnesium and a spot of sodium, potassium, chlorine in addition, mud extraction can be made fertilizer.
Embodiment:
The invention will be further described below by embodiment:
Embodiment: 120g lime (60%CaO) joined stir evenly (water ratio 90% ~ 91%) in the 4000ml active sludge sewage, adding the 1000ml waste lye again mixes, make active sludge: calcium oxide: alkaline residue butt ratio is 40: 7.2: 15 and stirs, quiet 5min, the precipitation active sludge carries out press filtration through plate-and-frame filter press under 0.4M Pa pressure, dwell time is 120min, the mud extraction water ratio is 52.55%, mud is interrupted air blast and spontaneous fermentation through 7d, can be directly as agricultural fertilizer after oven dry and the pulverizing.
Claims (3)
1, the application of discarded alkali slag/alkali liquid in activated sludge dehydration.
2, the application of discarded alkali slag/alkali liquid according to claim 1 in activated sludge dehydration is characterized in that: put into the calcium oxide in the sewage and the consumption of waste soda residue/alkali lye and will make active sludge: calcium oxide: the butt weight ratio of alkali slag/alkali liquid is 40: 3～10: 3～20.
3, the application of discarded alkali slag/alkali liquid according to claim 1 and 2 in activated sludge dehydration is characterized in that: put into the calcium oxide in the sewage and the consumption of waste soda residue/alkali lye and will make active sludge: calcium oxide: the butt weight ratio of alkali slag/alkali liquid is 40: 6～10: 12～16.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100735515A CN101265011A (en) | 2008-04-24 | 2008-04-24 | Application of discarded alkali slag/alkali liquid in activated sludge dehydration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100735515A CN101265011A (en) | 2008-04-24 | 2008-04-24 | Application of discarded alkali slag/alkali liquid in activated sludge dehydration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101265011A true CN101265011A (en) | 2008-09-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100735515A Pending CN101265011A (en) | 2008-04-24 | 2008-04-24 | Application of discarded alkali slag/alkali liquid in activated sludge dehydration |
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| CN (1) | CN101265011A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823827A (en) * | 2010-04-20 | 2010-09-08 | 上海大学 | Method for conditioning municipal rest sludge with industrial epoxy resin wastewater |
| CN101830626A (en) * | 2010-04-22 | 2010-09-15 | 曾庆汛 | High-efficiency full-closed sludge treatment system and method thereof |
| CN104961322A (en) * | 2015-05-19 | 2015-10-07 | 温州大学 | Mud-water separation device and slurry mud-water separation method |
| CN113069709A (en) * | 2021-03-30 | 2021-07-06 | 北京荣创岩土工程股份有限公司 | Treatment process for stably dehydrating ammonia-soda process alkaline residue |
-
2008
- 2008-04-24 CN CNA2008100735515A patent/CN101265011A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101823827A (en) * | 2010-04-20 | 2010-09-08 | 上海大学 | Method for conditioning municipal rest sludge with industrial epoxy resin wastewater |
| CN101830626A (en) * | 2010-04-22 | 2010-09-15 | 曾庆汛 | High-efficiency full-closed sludge treatment system and method thereof |
| CN101830626B (en) * | 2010-04-22 | 2012-02-08 | 曾庆汛 | High-efficiency full-closed sludge treatment system and method thereof |
| CN104961322A (en) * | 2015-05-19 | 2015-10-07 | 温州大学 | Mud-water separation device and slurry mud-water separation method |
| CN113069709A (en) * | 2021-03-30 | 2021-07-06 | 北京荣创岩土工程股份有限公司 | Treatment process for stably dehydrating ammonia-soda process alkaline residue |
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Open date: 20080917 |