CN101597105B - Preparation method for magnetic carrier in processing technique of sewage biological fluidized bed - Google Patents
Preparation method for magnetic carrier in processing technique of sewage biological fluidized bed Download PDFInfo
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- CN101597105B CN101597105B CN2009100995165A CN200910099516A CN101597105B CN 101597105 B CN101597105 B CN 101597105B CN 2009100995165 A CN2009100995165 A CN 2009100995165A CN 200910099516 A CN200910099516 A CN 200910099516A CN 101597105 B CN101597105 B CN 101597105B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a preparation method for a magnetic carrier in a processing technique of a sewage biological fluidized bed, which comprises the following steps: (1) magnetic powder is added into a reaction kettle; in the stirring speed of 40 to 100 r/min, inorganic acid and organic acid are sequentially added and heated till the temperature is risen to 65 to 80 DEG C and the reaction lasts for 1.5 to 2 hours; (2) reactant is transferred to a dying cabinet, dried for 0.5 to 1 hours in the temperature of 80 to 100 DEG C, anhydrated, cooled and then crushed by a grinding crusher and sieved with a mesh screen with 100 meshes to obtain granular magnetic carriers. The preparation method has simple process route, low energy consumption, high efficiency and low cost. The magnetic carrier obtained by the preparation method is a shell structure; microorganisms easily grow biological membranes on the magnetic carrier; residual biological membranes can be removed by a magnetic drum separator, thus avoiding the huge loss of organisms. The biological fluidized bed using the magnetic carrier is suitable for fields such as standard reaching discharging treatment of town sewage, synchronous denitrification and dephosphorization of high nitrogen and phosphorus medical waste water, nitrification and denitrification of garbage percolate, coking wastewater and the like.
Description
Technical field
The invention belongs to the environmental protection field, relate to a kind of preparation method who is used for the magnetic carrier of biological fluidized bed sewage treatment process, magnetic carrier is easy to biofilm development, can increase the sludge concentration in the biological fluidized bed, improve sewage treating efficiency, in addition, magnetic carrier is convenient to realize unnecessaryly on the carrier biomembranously removing and upgrading by magnetic separation technique, reduces the loss of carrier.
Background technology
The pollutants in sewage complicated component, mostly based on organic pollutant, usually biological process is the most economical effective means of sewage disposal, and biological process is divided into activated sludge process and biomembrance process two big classes, Activated Sludge Process maturation, operational management be convenient, it is comparatively extensive to use, and China adopts Activated Sludge Process at have an appointment 40% municipal sewage plant.But activated sludge process structures floor space is big, be prone to sludge bulking, not high to the sewage denitrification and dephosphorization processing efficiency.The immobilized microorganism technique of being devoted to improve saprobia method processing efficiency has in recent years obtained rapid progress, thereby biomembrane process becomes the main flow direction of following biological sewage treatment development, representational bio membrane process has BAF, contact oxidation technology, blodisc and biological fluidized bed, wherein the organism fluidization bed process is to develop in order to solve BAF and contact oxidation technology pond body blockage problem and next new bio embrane method technology, it is with sand, gac, polymer carriers etc. are filled in reactor, at filling surface apposition growth microbial film, along with drainage flow or aeration make filler in the reactor fluidisation, the microbial film on the filler contacts with pollutent in the sewage and makes contaminant degradation.
Advantages such as biological fluidized bed has that processing efficiency height, volumetric loading are big, strong shock resistance, occupation area of equipment are little, the biofilm carrier of load microorganism is the core of biological fluidized bed, fluidized-bed carrier commonly used at present has quartz sand, gac, slag, polystyrene spheres and polyurethane foam etc., but some problems below these materials usually exist in application as the biological fluidized bed biofilm carrier: quartz sand has intensity preferably as aerobic biological fluid-bed biofilm carrier, but because of its smooth surface easy to be filmed not; Gac or slag high adsorption capacity, surface irregularity, than easy to be filmed, but its intensity is relatively poor, easy breakage during demoulding and number of dropouts is very big; Polystyrene spheres exists biofilm difficult and be difficult for the fluidizing shortcoming as biofilm carrier, and runs off easily in the demoulding process.In addition, though biofilm carrier particle tiny, light weight has bigger specific surface area than oarse-grained carrier, has more advantage on processing efficiency, is difficult to sedimentation, can only in biological fluidized bed, operation below the critical velocity could guarantee not overflow, limit the operation of equipment ability with water outlet; And the big carrier granule sedimentation of density is fast, but this class material surface is smooth usually, and biofilm is slower.
Usually, the particle diameter of carrier itself, density, surfaceness and surface charging characteristic all to microorganism in the biological fluidized bed carrier surface adhere to and activity has considerable influence.The carrier of different-grain diameter and density has specific Minimum Fluidization Velocity of White, it is also different to make it the required energy consumption of fluidisation, and biological fluidized bed carrier particle diameter is little in general, and specific surface area is big, microbial biomass is more relatively, waste water is also little to the shearing force of small particle size carrier, thereby biochemical effect is better, but particle diameter is too small, under certain flow rate, the bed expansion rate is bigger, and contained microbial biomass reduces on the contrary in the unit volume, and then the particle diameter of carrier also can exert an influence to biomembranous thickness.The carrier surface roughness is big more, for microorganism provide to adhere to production many more, also can weaken hydraulic disturbance, wash away and cause biomembranous coming off, help the production breeding of long bacterium generation time.In addition, the microorganism surface is electronegative usually, and positively charged solid support material also helps microorganism and moves to carrier surface, shortens the microbial film biofilm time.
Thereby be applicable to that the ideal biofilm carrier of biological fluidized bed should satisfy following condition: (1) carrier is renewable and reusable; (2) carrier is cheap, physical strength is high, resistance to mass transfer is little; (3) carrier combines with microorganism firmly, can resist stronger sluicing; (4) it is few to be carried on germs collect degree height, the loss of activity of carrier, good stability, the variation of the factor that can conform; (5) carrier is nontoxic to microorganism, antimicrobial decomposition.
Application number is that 200810102920.9 patent of invention discloses a kind of that magnetic substance and high molecular polymer is compound as biofilm carrier in the sewage aeration pond, the weight percent of described magnetic-particle and high molecular polymer is: magnetic-particle 7～21%, high molecular polymer 79～91%.Realize that by wet type cartridge type permanent magnetism low intensity magnetic separator the magnetic bio membrane carrier after the recovery refluxes in the aerated reaction pond to unnecessary biomembranous removing.This invention has the biofilm carrier of magnetic by preparation, realized with of demoulding and the high efficiente callback of permanent magnetism separating device magnetic carrier, but its biofilm carrier and microorganism affinity are relatively poor, easy to be filmed not, and the water processing establishment of carrier and corresponding construction is not combined, influenced the raising and the application of processing efficiency.
Application number is that 200510041717.1 patent of invention discloses a kind of biological granulating fluidized bed waste disposal plant; by in active sludge, adding inorganic coagulant and polymeric flocculant and stirring and realize suspended particleization in the sewage; make that the grain diameter that produces is big, density is high, settling velocity is fast; be implemented in and finish high-performance bio Degradation and efficient solid-liquid separation in the reactor simultaneously; realization response and isolating synchronization; shorten sewage treatment process; reduce engineering cost, and isolating chemical sludge is stable.But the particle of biological fluidized bed is comparatively loose in this invention, be subjected to external current disturbed conditions influence easily, and adding continuously of inorganic coagulant is suppressed to some extent to microorganism active in a large number, and it is bigger to produce surplus sludge volume.
Summary of the invention
The objective of the invention is the problem that is easy to run off at present existing biological fluidized bed carrier biofilm difficulty, carrier, a kind of preparation method who is used for the magnetic carrier of biological fluidized bed sewage treatment process is provided.By the compound acid surfaces modification of adopting organic acid and mineral acid to form to the spontaneous magnetism particle, prepare the magnetic carrier that is easy to biological attachment and recovery, it has good magnetic responsiveness and the surface has positive charge and good bioaffinity, can realize the biomembranous high efficiente callback that removes with magnetic carrier of residue on the magnetic carrier by the magnetic drum separator, improve cyclic utilization rate, avoid the loss of magnetic carrier.
The preparation method who is used for the magnetic carrier of processing technique of sewage biological fluidized bed comprises the steps:
1) magnetic being added reactor, is under 40～100r/min at mixing speed, adds mineral acid, organic acid successively, and reacted 1.5～2 hours heat temperature raising to 65～80 ℃;
2) with reactant transfer to loft drier, in 80～100 ℃ of down oven dry 0.5～1 hour, the mummification cooling and obtains the particle magnetic carrier after sieving with 100 eye mesh screens after abrading type disintegrator is pulverized.
Described magnetic is magnetite powder or iron scale, and granularity of magnet powder is 200～400 orders, magnetic iron content 55%～70%.Mineral acid is 35%～50% sulfuric acid, 27%～35% hydrochloric acid or 40%～55% nitric acid, and organic acid is 50%～98% acetate or 3%～10% oxyacetic acid.Magnetic, mineral acid and organic acid mass ratio are: 1: 0.2～1: 0.1～0.5.
Operational path of the present invention is simple, energy consumption is low, efficient is high, and production cost is low.The magnetic carrier for preparing is a nucleocapsid structure, has good magnetic responsiveness, magnetic carrier being dropped in the aeration biochemical fluidized-bed of inoculation of activated-sludge aeration cultivates, because the positively charged poly-hydroxy iron in magnetic carrier surface is to electrical neutralization and the adsorption bridging effect of electronegative microorganism, make microorganism more easily in magnetic carrier surface attachment growth, form fine and close and in conjunction with firm microbial film.When microbial film gradually thickening and occur aging after, the good magnetic responsiveness that utilizes magnetic carrier itself to have, can adopt the magnetic drum separator that the unnecessary aging microbial film in magnetic carrier surface is peeled off down, realization is to the renewal of magnetic carrier surface biological film, the magnetic carrier that recovery obtains refluxes in fluidized-bed reactor, utilize magnetic drum separator demoulding process simple, to the rate of recovery height of magnetic carrier, carrier breakage and the losing issue of having avoided traditional gac, quartz sand, polyurethane foam etc. to cause as high strength dispersed with stirring in the biofilm carrier demoulding process.
Magnetic carrier is applicable to the fields such as nitrated denitrogenation of synchronous denitrification dephosphorizing, percolate and the coking chemical waste water etc. of the qualified discharge processing of town sewage, high nitrogen phosphorus pharmaceutical wastewater as the organism fluidization bed process of biofilm carrier.
Embodiment
The preparation method of magnetic carrier provided by the invention is under relatively mild reaction conditions, adding is controlled magnetic fine particle top layer and compound acid-respons generation transition state iron carbonyl compound with respect to the compound acid that the magnetic deficiency makes it complete reaction, and keep magnetic kernel portion (magnetic nuclear) structure not to be destroyed, thereby the magnetic carrier solid particulate integral body that can keep preparing has good magnetic responsiveness.Because acetate or oxyacetic acid (HO-CH in the organic acid that is added
2-carboxyl COOH) helps to generate on magnetic nuclear surface in the reaction process iron carbonyl compound of transition state, the iron carbonyl compound has positive charge, has huge surface-area and high surface energy, and organic acid carboxyl functional group and microorganism have good affinity and consistency, thereby making magnetic carrier in biological fluidized bed, have stronger electrical neutralization and adsorption to the microorganism that has negative charge, the microbial film of growth is closely knit, anti-shear performance good.
Embodiment 1:
At first in reactor, add 1 kilogram of 400 magnetite powder about order, under the mixing speed of 40r/min, the dilute sulphuric acid that at the uniform velocity adds 0.2 kilogram 50%, the oxyacetic acid solution that adds 0.1 kilogram 3% again, after mixing, begin to heat to 65 ℃, behind the stirring reaction 1.5 hours, reactant begins to solidify, then with reactant transfer 0.5 hour to loft drier in 80 ℃ of dryings, pulverize with abrading type disintegrator the cooling back, through obtaining the particle magnetic carrier of brownish black after the screening of 100 eye mesh screens.
At laboratory preparation simulated domestic wastewater, COD is at 952mg/L～1120mg/L, NH
3-N is at 53mg/L～78mg/L, TP is at 5mg/L～8mg/L, in three-phase fluid bed reactor behind the inoculation of activated-sludge, add 10g/L magnetic carrier aeration and cultivate biofilm, all artifact films grow up to, the laggard stable effluent quality of two weeks, interval type adopts the magnetic drum separator to remove the microbial film of magnetic carrier surface ag(e)ing, sludge concentration reaches 5.49g/L, the COD average removal rate is reached 95%, NH
3-N average removal rate reaches 85%, and TP on average removes and reaches 82%.
Embodiment 2:
At first in reactor, add 1 kilogram of 200 iron scale about order, under the mixing speed of 100r/min, the dilute hydrochloric acid that evenly adds 1 kilogram 30% adds 0.5 kilogram of 50% acetic acid solution, after mixing again, slowly heat to 80 ℃, behind the stirring reaction 2 hours, reactant begins to solidify, and then reactant transfer is gone into loft drier in 100 ℃ of dryings 1 hour, pulverize with abrading type disintegrator the cooling back, through obtaining brown xanchromatic particle magnetic carrier after the screening of 100 eye mesh screens.
To certain chemical plant bio-chemical effluent, COD is at 81mg/L～120mg/L in laboratory needle, NH
3-N is at 78mg/L～112mg/L, and TP is at 5mg/L～9.2mg/L, in laboratory test utilization magnetic carrier organism fluidization bed process synchronous denitrification dephosphorizing.In three-phase fluid bed reactor seed sludge and add the 20g/L magnetic carrier after aeration cultivate, the artifact film grew up in 10 days, interval type adopts the magnetic drum separator to remove the microbial film of magnetic carrier surface ag(e)ing, and periodic replenishment adds magnetic carrier, 20 days laggard stable effluent quality, the COD average removal rate is reached 55%, NH
3-N average removal rate reaches 85%, and TP on average removes and reaches 86%.
Claims (2)
1. a preparation method who is used for the magnetic carrier of processing technique of sewage biological fluidized bed is characterized in that comprising the steps:
1) magnetic being added reactor, is under 40～100r/min at mixing speed, adds mineral acid, organic acid successively, and reacted 1.5～2 hours heat temperature raising to 65～80 ℃;
2) with reactant transfer to loft drier, in 80～100 ℃ of down oven dry 0.5～1 hour, the mummification cooling and prepares the particle magnetic carrier after sieving with 100 eye mesh screens after abrading type disintegrator is pulverized;
Described mineral acid is 35%～50% sulfuric acid, 27%～35% hydrochloric acid or 40%～55% nitric acid, organic acid is 50%～98% acetate or 3%～10% oxyacetic acid, and described magnetic, mineral acid and organic acid mass ratio are: 1: 0.2～1: 0.1～0.5.
2. a kind of preparation method who is used for the magnetic carrier of processing technique of sewage biological fluidized bed according to claim 1 is characterized in that described magnetic is magnetite powder or iron scale, and granularity of magnet powder is 200～400 orders, magnetic iron content 55%～70%.
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| CN104163497B (en) * | 2014-05-05 | 2016-03-02 | 浙江省环境保护科学设计研究院 | A kind of low dissolved oxygen magnetic biochemical treatment system and technique |
| CN104386805B (en) * | 2014-12-08 | 2016-08-17 | 南京大学 | A kind of aging biofilm packing reparative regeneration method that suspends |
| CN104829041B (en) * | 2015-04-15 | 2017-01-18 | 昆明理工大学 | Magnetic biological filtration pool |
| CN104843870B (en) * | 2015-04-24 | 2017-01-11 | 浙江省环境保护科学设计研究院 | Magnetic carrier immobilized microorganism live bacteria preparation and preparation method and application thereof |
| CN105967322A (en) * | 2016-07-18 | 2016-09-28 | 胡勇飞 | Immobilized microbial ball used in sewage treatment plant and operating method thereof |
| CN106915822B (en) * | 2017-02-21 | 2020-02-07 | 济南大学 | Composite magnetic particle based on alnico |
| CN107032549A (en) * | 2017-04-01 | 2017-08-11 | 安徽普氏生态环境工程有限公司 | A kind of sewerage advanced treatment process |
| CN107469463B (en) * | 2017-08-11 | 2021-09-17 | 河北工程大学 | Preparation method of composite hydrophilic modified quartz sand filter material |
| CN114920351B (en) * | 2022-05-19 | 2023-04-21 | 中建环能科技股份有限公司 | Sewage denitrification carrier and preparation method and application thereof |
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| CN1445797A (en) * | 2003-04-01 | 2003-10-01 | 吉林大学 | Magnetic hud fine particles possessing strong magnetic field response capability and its preparing method |
| CN1919444A (en) * | 2006-08-10 | 2007-02-28 | 同济大学 | Method for preparation of polyester magnetic composite microsphere capable of being biodegraded |
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Assignee: Zhejiang Research Institute of Environmental Science Co., Ltd. Assignor: Zhejiang Environmental Protection Research Academy Contract record no.: 2011330000172 Denomination of invention: Preparation method for magnetic carrier in processing technique of sewage biological fluidized bed Granted publication date: 20110119 License type: Exclusive License Open date: 20091209 Record date: 20110330 |
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