CN101537342A - Chemical modification method for preparing residual activated sludge to absorbent - Google Patents
Chemical modification method for preparing residual activated sludge to absorbent Download PDFInfo
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- CN101537342A CN101537342A CN200910096906A CN200910096906A CN101537342A CN 101537342 A CN101537342 A CN 101537342A CN 200910096906 A CN200910096906 A CN 200910096906A CN 200910096906 A CN200910096906 A CN 200910096906A CN 101537342 A CN101537342 A CN 101537342A
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Abstract
The invention discloses a chemical modification method of preparing residual activated sludge into an absorbent, comprising the steps of cleaning the residual activated sludge of a sewage treatment plant, drying and screening. A surfactant is dissolved in water to be mixed with the residual activated sludge, thereby forming reaction slurry; the stirring reaction is carried out at room temperature for a certain time, and then the temperature is increased to a certain temperature for carrying out the thermostatic reaction; the solid-liquid separation, the water washing, the constant temperature drying, the breaking and the screening are carried out on the slurry after the reaction, so as to obtain the residual activated sludge absorbent after the modification. The chemical modification method can effectively prepare the residual activated sludge to the absorbent which can absorb organic matters with poor water solubility in the water or waste water under mild conditions, the preparation has low energy consumption, low cost, and simple process, and the absorbent has good absorption effect.
Description
Technical field
The invention belongs to the reclamation of solid wastes technical field, relate in particular to the method that the residual active sludge modification prepares adsorbent.
Background technology
In the process of Wastewater Treated by Activated Sludge Process sewage, can produce residual active sludge.Along with activated sludge process application more and more widely, the generation of residual active sludge is also increasing.Residual active sludge moisture content height, foul smelling contains toxic chemical substance and pathogenic microorganism, if do not deal carefully with and dispose, will cause secondary pollution.When people regard residual active sludge as solid waste, be more prone to it is considered as a kind of resource of offing normal.At present, that the main disposal options of residual active sludge has is agricultural, landfill, burning, water body are dissolved etc., and wherein agricultural disposal must be quite careful, and it is to abandon disposal that landfill, burning and water body are dissolved, and is caving-in bash from utilization of resources angle.Therefore, people are exploring the technology of residual active sludge recycling always, are that base-material prepares the direction that adsorbent just belongs to recycling with the residual active sludge.
Made from residual actived sludge is equipped with adsorbent and mainly contains dual mode: (1) high temperature pyrolysis prepares active carbon; (2) chemical modification prepares adsorbent.
Content of organics height in the residual active sludge, 60%-70% are crude protein, and 25% is carbohydrate, and ash content accounts for 5%.Therefore through the activation of a definite form (as ZnCl
2Activation), the high temperature Non-oxygen pyrolytic can prepare active carbon then.The quality of the active carbon of this method preparation generally is lower than the traditional commerce active carbon, but when handling organic wastewater, but is better than the COD adsorbance and the adsorption equilibrium of commercial active carbon.Because residual active sludge contains the heavy metal of higher concentration sometimes, cause its application scenario to be restricted, but in some occasions (as the gas purification engineering), its application is more more economical than traditional active carbon.But obviously, the pyrolysismethod power consumption is big, and has destroyed the living beings in the mud.On the other hand, studies show that normal temperature chemical modification activated sludge has adsorption function, the heavy metal in useless (dirt) water, halides, phenols etc. had adsorb removal effect preferably that its mechanism is physical absorption and chemisorbed comprehensive function.The adsorbent of chemical modification excess sludge preparation also can be applicable to the absorption of oil spilling.The normal temperature chemical modification prepares activated carbon with the mode that made from residual actived sludge is equipped with for adsorbent than pyrolysismethod, consume energy extremely low, technology is simple, and for the advantages of good adsorption effect of predetermined substance.Document Effectof conditioning for Pb (II) and Hg (II) biosorption on waste activated sludge (M.
M.E.Keskin, S.Mazluma, N.Mazluma, Chemical Engineering andProcessing, 47 (1), disclose a lot of methods in 31-40) mud has been prepared into adsorbent, such as with NaOH, Na
2CO
3And acid goes modification, perhaps directly with drying sludge as adsorbent, make the adsorbent that metal is had adsorption capacity.
Summary of the invention
The invention provides a kind ofly under normal temperature, normal pressure, use surfactant-modified residual active sludge, be prepared as the method for the organic pollutant adsorption agent that can effectively remove poorly water-soluble in the water.
A kind of the residual active sludge resource is prepared into the method for adsorbent, comprises, the residual active sludge of sewage treatment plant is cleaned, 55-100 ℃ oven dry, crosses the 48-150 mesh sieve; With the surfactant aqueous surfactant solution that is made into soluble in water, drop into the residual active sludge after sieving, form reacting slurry, under the room temperature stirring reaction 1-5 hour, be warmed up to 40-85 ℃ then, under this temperature conditions, carried out isothermal reaction 10-20 hour; After reaction finishes, the slurries Separation of Solid and Liquid, washing, 50-100 ℃ of freeze-day with constant temperature crossed the 48-150 mesh sieve, promptly obtains the activated sludge adsorbent after the chemical modification.
Residual active sludge is sieved, can increase the contact area of mud and surfactant; Mud after the modification is sieved, be convenient to industrial implementation and throw in.But when commercial Application, cross grit number too conference expend a large amount of financial resource and material resource, so the inventive method choose one preferably order count scope (48-150 order), in the scope that cost is allowed, increase adsorption effect as far as possible.
Described residual active sludge is the solid waste of municipal sewage plant, through being semi-fluid attitude mud shape after the dehydration.
The temperature room temperature that is used to clean the water of residual active sludge gets final product, temperature too high (＞80 ℃), and then destructible living beings group causes product quality to descend.
Described freeze-day with constant temperature temperature is 50-100 ℃, and temperature is too high might to cause living beings surface group inactivation; Temperature is too low then to cause drying time very long, the industrial production inefficiency.
The quality percentage composition of surfactant is 0.1%-10% in the aqueous surfactant solution, and surfactant is one or more in softex kw, lauryl sodium sulfate, cetylpyridinium chloride, neopelex, 4 bromide, tetraethylammonium bromide, 4-propyl bromide, the four pentyl ammonium bromide.
The quality percentage composition of residual active sludge is 10%-30% in the described reacting slurry.
Reacting slurry carries out two elementary reactions uniformly: the phase I (room temperature stage) finishes under stirring condition, main purpose is to allow slurries fully mix, allow mud be well dispersed in to be the solution the inside of solvent, reach fully contacting of mud and surfactant with the surfactant; Second stage is the isothermal reaction stage under the higher temperature, mainly be to allow well-mixed reacting slurry fully react (this stage does not need to stir), make the surface group and the surfactant of mud fully react, and leave standstill and allow the sludge settling that reacts completely get off, be convenient to further mud-water separation.
Process conditions such as the concentration of control surface activating agent, concentration of activated sludge, reaction time and reaction temperature can access the modification residual active sludge adsorbent of best performance.
The principle that surfactant-modified made from residual actived sludge is equipped with adsorbent is: the live end of surfactant and the affine absorption in surface of the living beings of residual active sludge, live end does not then present lipophile, therefore has the organic function of poorly water-soluble in adsorbed water and the waste water.Such as cationic surfactant, its live end at first adsorbs with the negative electrical charge generation ionic bond on living beings surface, and uncharged then hydrophobic side combines with the organic matter of poorly water-soluble, reaches absorption and removes organic purpose.
The present invention has following beneficial effect:
(1) is the raw material of adsorbent with the residual active sludge, belongs to the reclamation of solid wastes utilization.
(2) Surfactant Chemistry modification has utilized the suction-operated of living beings in the activated sludge.
(3) preparation condition gentleness, with respect to the pyrolysis preparation method, energy consumption and secondary pollution greatly reduce.
(4) Zhi Bei adsorbent can be widely used in the organic pollution that the poorly water-soluble in water and the sewage is removed in absorption, and it is higher to remove efficient.
(5) preparation method is comparatively simple, cost is low.
The specific embodiment
Embodiment 1
With the residual active sludge washing, 55 ℃ of dryings are crossed 65 mesh sieves.Compound concentration is 0.15% the softex kw aqueous solution, transports in the normal pressure reactor, adds dry activated sludge, the mass content that makes activated sludge in the reaction paste is 11%, stirred 2 hours, slurry is warming up to 63 ℃ then, isothermal reaction 18 hours, the reaction paste Separation of Solid and Liquid, the washing filter cake is put then under 52 ℃ of conditions and is dried, and pulverizes, cross 65 mesh sieves, packing.Contain the waste water of 55mg/L dibutyl phthalate with this product treatment, the clearance of dibutyl phthalate is 83.9%.
Embodiment 2
With the residual active sludge washing, 65 ℃ of dryings are crossed 80 mesh sieves.Compound concentration is 1.0% lauryl sodium sulfate aqueous solution, transports in the normal pressure reactor, adds dry activated sludge, the mass content that makes activated sludge in the reaction paste is 15%, stirred 1 hour, slurry is warming up to 45 ℃ then, isothermal reaction 15 hours, the reaction paste Separation of Solid and Liquid, the washing filter cake is put then under 90 ℃ of conditions and is dried, and pulverizes, cross 80 mesh sieves, packing.Contain the waste water of 35mg/L chloroform with this product treatment, the clearance of chloroform is 80.2%.
Embodiment 3
With the residual active sludge washing, 70 ℃ of dryings are crossed 115 mesh sieves.Compound concentration is 2.3% the cetylpyridinium chloride aqueous solution, transports in the normal pressure reactor, adds dry activated sludge, the mass content that makes activated sludge in the reaction paste is 20%, stirred 3 hours, slurry is warming up to 75 ℃ then, isothermal reaction 20 hours, the reaction paste Separation of Solid and Liquid, the washing filter cake is put then under 70 ℃ of conditions and is dried, and pulverizes, cross 115 mesh sieves, packing.Contain the waste water of 60mg/L parachlorophenol with this product treatment, the clearance of parachlorophenol is 90.3%.
Embodiment 4
With the residual active sludge washing, 92 ℃ of dryings are crossed 100 mesh sieves.Compound concentration is 4.3% sodium dodecyl benzene sulfonate aqueous solution, transports in the normal pressure reactor, adds dry activated sludge, the mass content that makes activated sludge in the reaction paste is 30%, stirred 5 hours, slurry is warming up to 52 ℃ then, isothermal reaction 13 hours, the reaction paste Separation of Solid and Liquid, the washing filter cake is put then under 100 ℃ of conditions and is dried, and pulverizes, cross 100 mesh sieves, packing.Contain the waste water of 39mg/L paradinitrobenzene with this product treatment, the clearance of paradinitrobenzene is 95.7%.
Embodiment 5
With the residual active sludge washing, 84 ℃ of dryings are crossed 48 mesh sieves.Compound concentration is 1.7% the 4 bromide aqueous solution, transports in the normal pressure reactor, adds dry activated sludge, the mass content that makes activated sludge in the reaction paste is 16%, stirred 3.5 hours, slurry is warming up to 73 ℃ then, isothermal reaction 14 hours, the reaction paste Separation of Solid and Liquid, the washing filter cake is put then under 76 ℃ of conditions and is dried, and pulverizes, cross 150 mesh sieves, packing.Contain the waste water of 100mg/L toluene with this product treatment, the clearance of toluene is 91.9%.
Embodiment 6
With the residual active sludge washing, 95 ℃ of dryings are crossed 80 mesh sieves.Compound concentration is 2.5% the tetraethylammonium bromide aqueous solution, transports in the normal pressure reactor, adds dry activated sludge, the mass content that makes activated sludge in the reaction paste is 22%, stirred 4 hours, slurry is warming up to 55 ℃ then, isothermal reaction 16 hours, the reaction paste Separation of Solid and Liquid, the washing filter cake is put then under 87 ℃ of conditions and is dried, and pulverizes, cross 80 mesh sieves, packing.Contain 36mg/L with this product treatment, 1, the waste water of 2-dichloropropane, 1, the clearance of 2-dichloropropane is 87.3%.
Embodiment 7
With the residual active sludge washing, 95 ℃ of dryings are crossed 60 mesh sieves.Compound concentration is 6.7% the 4-propyl bromide aqueous solution, transports in the normal pressure reactor, adds dry activated sludge, the mass content that makes activated sludge in the reaction paste is 19%, stirred 1 hour, slurry is warming up to 77 ℃ then, isothermal reaction 14 hours, the reaction paste Separation of Solid and Liquid, the washing filter cake is put then under 95 ℃ of conditions and is dried, and pulverizes, cross 60 mesh sieves, packing.Contain the waste water of 81mg/L nitrobenzene with this product treatment, the clearance of nitrobenzene is 89.7%.
Embodiment 8
With the residual active sludge washing, 60 ℃ of dryings are crossed 65 mesh sieves.Compound concentration is 2.5% the softex kw aqueous solution, transports in the normal pressure reactor, adds dry activated sludge, the mass content that makes activated sludge in the reaction paste is 13%, stirred 2 hours, slurry is warming up to 60 ℃ then, isothermal reaction 19 hours, the reaction paste Separation of Solid and Liquid, the washing filter cake is put then under 60 ℃ of conditions and is dried, and pulverizes, cross 65 mesh sieves, packing.Contain the waste water of 90mg/L parachlorotoluene with this product treatment, the clearance of parachlorotoluene is 87.6%.
Embodiment 9
With the residual active sludge washing, 60 ℃ of dryings are crossed 150 mesh sieves.Compound concentration is 4.5% four pentyl bromize ammonium solution, transports in the normal pressure reactor, adds dry activated sludge, the mass content that makes activated sludge in the reaction paste is 28%, stirred 1.5 hours, slurry is warming up to 70 ℃ then, isothermal reaction 12 hours, the reaction paste Separation of Solid and Liquid, the washing filter cake is put then under 65 ℃ of conditions and is dried, and pulverizes, cross 115 mesh sieves, packing.Contain 53mg/L with this product treatment, the waste water of propylparaben, the clearance of propylparaben are 88.9%.
Embodiment 10
With the residual active sludge washing, 61 ℃ of dryings are crossed 60 mesh sieves.Compound concentration is 0.53% lauryl sodium sulfate aqueous solution, transports in the normal pressure reactor, adds dry activated sludge, the mass content that makes activated sludge in the reaction paste is 26%, stirred 2.5 hours, slurry is warming up to 55 ℃ then, isothermal reaction 17 hours, the reaction paste Separation of Solid and Liquid, the washing filter cake is put then under 65 ℃ of conditions and is dried, and pulverizes, cross 60 mesh sieves, packing.Contain the waste water of 50mg/L ethylbenzene with this product treatment, the clearance of ethylbenzene is 90.0%.
Embodiment 11
With the residual active sludge washing, 75 ℃ of dryings are crossed 100 mesh sieves.Compound concentration is 8.5% sodium dodecyl benzene sulfonate aqueous solution, transports in the normal pressure reactor, adds dry activated sludge, the mass content that makes activated sludge in the reaction paste is 10%, stirred 3 hours, slurry is warming up to 47 ℃ then, isothermal reaction 20 hours, the reaction paste Separation of Solid and Liquid, the washing filter cake is put then under 75 ℃ of conditions and is dried, and pulverizes, cross 100 mesh sieves, packing.Contain the waste water of 27mg/L di-n-octyl phthalate with this product treatment, the clearance of di-n-octyl phthalate is 86.2%.
Embodiment 12
With the residual active sludge washing, 100 ℃ of dryings are crossed 80 mesh sieves.Compound concentration is 0.1% softex kw and 1.3% neopelex mixed aqueous solution, transports in the normal pressure reactor, adds dry activated sludge, the mass content that makes activated sludge in the reaction paste is 19%, stirred 2.5 hours, slurry is warming up to 81 ℃ then, isothermal reaction 13 hours, the reaction paste Separation of Solid and Liquid, the washing filter cake is put then under 81 ℃ of conditions and is dried, and pulverizes, cross 80 mesh sieves, packing.Contain the waste water of 90mg/L toluene with this product treatment, the clearance of toluene is 87.1%.
Claims (7)
1, a kind of made from residual actived sludge is equipped with into the chemical modification method of adsorbent, comprising: the residual active sludge of sewage treatment plant is cleaned, and oven dry is sieved; With the surfactant aqueous surfactant solution that is made into soluble in water, the residual active sludge that drops into again after sieving forms reacting slurry, and stirring reaction under the room temperature heats up then, reacts under constant temperature after uniform temperature; Reacted slurries carry out Separation of Solid and Liquid, washing, and freeze-day with constant temperature, fragmentation is sieved, and promptly obtains the activated sludge adsorbent after the modification.
2, chemical modification method as claimed in claim 1 is characterized in that: excess sludge cleans the back dries under 55-100 ℃ of condition, crosses the 48-150 mesh sieve.
3, chemical modification method as claimed in claim 1 is characterized in that: the quality percentage composition of surfactant is 0.1%-10% in the described aqueous surfactant solution.
4, as claim 1 or 3 described chemical modification methods, it is characterized in that: described surfactant is one or more in softex kw, lauryl sodium sulfate, cetylpyridinium chloride, neopelex, 4 bromide, tetraethylammonium bromide, 4-propyl bromide, the four pentyl ammonium bromide.
5, chemical modification method as claimed in claim 1 is characterized in that: the quality percentage composition of residual active sludge is 10%-30% in the described reacting slurry.
6, chemical modification method as claimed in claim 1 is characterized in that: stir companion's reaction 1-5 hour under the room temperature, be warming up to 40-85 ℃ then, carried out isothermal reaction 10-20 hour.
7, chemical modification method as claimed in claim 1 is characterized in that: described freeze-day with constant temperature temperature is 50-100 ℃, and the 48-150 mesh sieve is crossed in broken back.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102814166A (en) * | 2011-06-08 | 2012-12-12 | 工信华鑫科技有限公司 | Preparation method of copper ion special-purposed adsorption material |
| CN104383882A (en) * | 2014-11-06 | 2015-03-04 | 昆明理工大学 | Method for preparing heavy metal chromium adsorbent and application thereof |
| CN104437389A (en) * | 2014-11-27 | 2015-03-25 | 昆明理工大学 | Preparation method and application of adsorbent for treating lead-containing waste water |
| CN105289522A (en) * | 2015-11-04 | 2016-02-03 | 梅庆波 | Preparation method for denitriding and dephosphorizing adsorbing agent for chimney waste gas of factory |
| CN107983313A (en) * | 2017-12-04 | 2018-05-04 | 湖南大学 | A kind of method that Cadmium In The Water Body ion adsorbent is prepared based on dilute sulfuric acid and DDBAC combined pretreatment wheat stalks |
| CN108745280A (en) * | 2018-05-15 | 2018-11-06 | 南京工程学院 | The combined preparation process of residual active sludge adsorbent and nystatin |
Family Cites Families (3)
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| CN1242927C (en) * | 2004-10-26 | 2006-02-22 | 哈尔滨工业大学 | Preparation method of sludge adsorbent and method for intensified processing domestic sewage using the same |
| CN1274403C (en) * | 2004-11-08 | 2006-09-13 | 哈尔滨工业大学 | Method for preparing active filtering absorbent material and method for intensify water treatment thereby |
| CN101053817A (en) * | 2006-04-12 | 2007-10-17 | 中国科学院生态环境研究中心 | Activated sludge adsorbent for zinc and its alkali preparing method |
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2009
- 2009-03-23 CN CN2009100969067A patent/CN101537342B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814166A (en) * | 2011-06-08 | 2012-12-12 | 工信华鑫科技有限公司 | Preparation method of copper ion special-purposed adsorption material |
| CN104383882A (en) * | 2014-11-06 | 2015-03-04 | 昆明理工大学 | Method for preparing heavy metal chromium adsorbent and application thereof |
| CN104437389A (en) * | 2014-11-27 | 2015-03-25 | 昆明理工大学 | Preparation method and application of adsorbent for treating lead-containing waste water |
| CN105289522A (en) * | 2015-11-04 | 2016-02-03 | 梅庆波 | Preparation method for denitriding and dephosphorizing adsorbing agent for chimney waste gas of factory |
| CN107983313A (en) * | 2017-12-04 | 2018-05-04 | 湖南大学 | A kind of method that Cadmium In The Water Body ion adsorbent is prepared based on dilute sulfuric acid and DDBAC combined pretreatment wheat stalks |
| CN108745280A (en) * | 2018-05-15 | 2018-11-06 | 南京工程学院 | The combined preparation process of residual active sludge adsorbent and nystatin |
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