CN102249402B - Low-density zeolite biological aerated filter filling and preparation method thereof - Google Patents
Low-density zeolite biological aerated filter filling and preparation method thereof Download PDFInfo
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- CN102249402B CN102249402B CN201110106007A CN201110106007A CN102249402B CN 102249402 B CN102249402 B CN 102249402B CN 201110106007 A CN201110106007 A CN 201110106007A CN 201110106007 A CN201110106007 A CN 201110106007A CN 102249402 B CN102249402 B CN 102249402B
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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
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Abstract
The invention discloses a low-density zeolite biological aerated filter filling and a preparation method thereof. The filling is a low-density zeolite biological aerated filter filling which is prepared through adopting foamed plastics particles as inner cores and adopting natural zeolite particles as shells. The raw materials of the filling comprise zeolite ore, cement and the foamed plastics particles. The preparation method is characterized by: crushing the zeolite ore; mixing the crushed zeolite ore and the cement to obtain a mixed material; then adding the mixed material to the foamed plastics particles while spraying water to enable the mixed material to be coated on the surface of the foamed plastics particles to obtain the low-density zeolite biological aerated filter filling. The low-density zeolite biological aerated filter filling provided by the present invention has high porosity, and has a pore size of 0.01-0.1 mm, such that the microorganisms can deeply enter into the inner void of the filling particles, therefore, the filling has large microorganism loading and high ammonia nitrogen removing efficiency. In addition, the filling has synchronous adsorption dephosphorization effects.
Description
One, technical field
The present invention relates to microbe carrier that uses in a kind of water treatment and preparation method thereof, specifically a kind of low density zeolite aerating biological filter pool filler and preparation method thereof.
Two, background technology
China is one of 13 insufficient countries of water resources in the world, and the Freshwater resources occupancy volume is less than 1/4 of world average level per capita, and spatial and temporal distributions is uneven, and in more than 600 city of China, 333 cities exist lack of water in various degree, 108 city serious water shortages.Simultaneously, China also is one of the most serious country of water resource waste, reusing sewage rate less than 5%.Therefore, open up this non-traditional water source of reuse water, realize sewage recycling, have the important strategic meaning ensureing urban safety water supply.But economy and security are the prerequisites that realizes reusing sewage, and also there are problems such as the urban look water corruption that causes in various degree, the corrosion of industrial equipments tubing system in the application of reuse water.At present, the reuse water safety-problems has become the subject matter of restriction China secondary draining resource utilization.Wherein, because the safety-problems that ammonia nitrogen causes in the reuse water is the most outstanding.Remove ammonia nitrogen in the secondary draining how efficiently, stably to reach the reclaimed water reuse water quality standard be a difficult problem, become the common problem of paying close attention to of Chinese scholars.
In traditional denitrogenation of waste water method, blow-off method, chemical oxidization method, complex-precipitation method and activated sludge process biological nitration denitrification technology all are not suitable for the removal of low-concentration ammonia-nitrogen.What at present, research was more is to adopt biomembrance process, ion exchange method and reverse osmosis membrane separation method.Though reverse osmosis method can obtain the fine water outlet, its investment and running cost are too high, are difficult to extensive employing.Biomembrance process is applicable to the processing of low concentration wastewater, but its processing efficiency is limited, and with the fluctuation and the changes of seasons of influent quality, effluent quality is difficult to reach the safe reuse requirement.Even it is nitrated fully that biomembrance process has been realized ammonia nitrogen, but be difficult to realize denitrification completely, still cause body eutrophication.Ion exchange method; Especially zeolite beds Filtration Adsorption can efficiently, stably be removed the ammonia nitrogen of lower concentration in the water, adopts zeolite adsorption to remove that remaining ammonia nitrogen has been proved to be feasible technically in the secondary draining; But adopt the saturated zeolites of regeneration absorption such as NaCl solution at present; The ammonia NaCl solution that contains that produces is difficult to handle, and the regenerated liquid processing cost is high, difficulty is big, thereby makes Activated Zeolite Adsorption water producing cost difficulty competitive.At present, also have the particulate zeolites of use BAF to handle ammonia nitrogen, but zeolite differ greatly to ammonia nitrogen absorption speed and biological nitration speed.Absorption and nitrated regeneration are difficult to synchronization of rate, and the particulate zeolites BAF is nitrated more complete, and denitrification is incomplete, effectively do not remove as the nitrogen of eutrophication composition, and only be the conversion of state, still can not satisfy the requirement of landscape water.
BAF (BAF, Biological Aerated Filter) also is submerged BAF (SBAF, Submerged Biological Aerated Filter).Abroad study since 20 beginnings of the century, in basic forming at the end of the eighties, after update, and develop various ways.On stream, fully used for reference the mentality of designing of WWT contact oxidation method and feedwater rapid filter, integrated aeration, high filtering velocity, hold back suspended substance, characteristics such as back flushing regularly.Its technological principle does, the less particulate filter of a certain amount of particle diameter of filling in the filter tank, the filter material surface microbial film of growing; The inner aeration in filter tank; Effluent stream through the time, utilize on the filtrate the strong oxidative degradation ability of high-concentration biological film that sewage is carried out fast purification, this is the oxidation degradation process; Simultaneously, because of effluent stream through the time, utilize particle diameter of filter medium features of smaller and biomembranous biological flocculation, hold back a large amount of suspended substances in the sewage, and guarantee that the microbial film come off can not take out of with water, this is a crown_interception; Behind the operation certain hour, because of the increase of head loss, need to carry out back flushing to the filter tank, the suspended substance of holding back with release also upgrades microbial film, and this is a backwash process.The major advantage of BAF is: (1) floor space is little, and initial cost is economized.Do not establish secondary sedimentation basins after the BAF, in addition, because the particle diameter of filter medium that adopts is less; Specific surface area is big, and living weight is high, adds back flushing and can effectively upgrade microbial film; Keep biomembranous high reactivity, so just can in the short time, carry out fast purification sewage.BAF hydraulic load, volumetric loading are much higher than traditional waste water treatment process, and the residence time is short, and therefore required biological treatment area and volume are all very little, have practiced thrift to take up an area of and investment.(2) effluent quality is high.In BAF, because filler itself is held back and the biological flocculation of surface biological film, make water outlet SS very low, generally be no more than 10mg/L; Because of periodic back flushing, microbial film is able to effective renewal, shows as microbial film thin (being generally about 110 μ m), and activity is very high.The material that highly active microbial film is adsorbable, hold back some difficult degradations.(3) transmission efficiency of oxygen is very high, and aeration rate is little, and the oxygen supply power consumption is low.Because of packing material size is very little, bubble constantly is cut into small bubbles in uphill process, strengthened the gas-to-liquid contact area, has improved the utilization ratio of oxygen; Bubble has received the resistance of filler in uphill process, prolonged the residence time, helps the mass transfer of oxygen equally.(4) capacity of resisting impact load is strong, and is low temperature resistant.(5) easy to be filmed starts fast.Had further research to BAF the beginning of this century, through control influent load and dissolved oxygen concentration, in single BAF, realizes removing C and synchronous nitration, denitrification, makes the application of BAF more effective, easy.Effluent quality that BAF is good and operational stability make its application in the reusing sewage field become the research focus of Chinese scholars.But how reducing the density and the production cost of BAF filler, improve, thereby improve processing efficiency, is one of direction of BAF technology future studies.
Three, summary of the invention
The present invention is for fear of above-mentioned existing in prior technology weak point, and low density zeolite aerating biological filter pool filler that a kind of particle porosity is high, the load of microorganisms amount is big, the preparation method is simple, cost is low and preparation method thereof is provided.
Technical solution problem of the present invention adopts following technical scheme:
The characteristics of low density zeolite aerating biological filter pool filler of the present invention are: said filler is to be kernel with the expanded plastic particle, is the low density zeolite aerating biological filter pool filler that shell forms with the natural zeolite particle.
The characteristics of low density zeolite aerating biological filter pool filler of the present invention are that its raw material constitutes by mass percentage: zeolite ore, cement and expanded plastic particle; Wherein the mass ratio of zeolite ore and cement is 3: 1-6: 1, and the volume sum of zeolite ore and cement and expanded plastic particulate volume ratio are 2: 1-1: 2.
The preparing method's of low density zeolite aerating biological filter pool filler of the present invention characteristics are to operate according to the following steps:
A, zeolite ore pulverized obtain 40-100 purpose zeolite powder, zeolite powder and cement mixing are got compound;
B, in pan-pelletizer, be sprinkled into the expanded plastic particle; Evenly water spray makes its moistened surface on expanded plastic particulate surface; At the uniform velocity be sprinkled into compound that step a obtains then and simultaneously to the particle surface water spray, the mass ratio of injection flow rate and said compound is 1: 2-2: 1, pan-pelletizer uniform rotation in horizontal plane progressively is coated on the expanded plastic particle said compound; When particle diameter stops to add compound and blanking from pan-pelletizer during for 4-10mm, store up normal temperature naturally and leave standstill and be no less than 5 days;
Said expanded plastic grain diameter is 2-4mm.
Beneficial effect compared with prior art of the present invention is embodied in:
1, the porosity of low density zeolite aerating biological filter pool filler of the present invention is high, has a large amount of open spaces to have aperture 0.01-0.1mm; Surface irregularity; Mikrobe can go deep into the granule interior space, compares with particulate zeolites with sintering ceramsite, more easily by microorganism colonization.As aerating biological filter pool filler, the load of microorganisms amount is big, and it is high to remove ammonia nitrogen efficient, and floor space is little, and processing cost is low.
2, low density zeolite aerating biological filter pool filler of the present invention contains natural zeolite, utilizes zeolite to NH
4 +Good absorption property, the fluctuation of buffering influent ammonium concentration, water outlet ammonia nitrogen concentration unloading phase of reducing BAF, after the back flushing.Improve the stability of BAF treatment effect, and solve the difficult problem of BAF nitrogen removal performance difference under the coldcondition.
3, low density zeolite aerating biological filter pool filler density of the present invention is low; The air-water back flushing is easy, and the weight that packing tower need carry is low, can reduce the BAF construction cost; And it is big to have solved present aerating biological filter pool filler density, the problem of back flushing difficulty.
4, low density zeolite aerating biological filter pool filler of the present invention has the advantage of normal temperature preparation; Ceramics filling surface knot glaze, shortcoming that open porosity is low have been overcome; Also do not need the high temperature of haydite to prepare process and equipment, save energy reduces the aerating biological filter pool filler production cost.
5, the particles of aggregates tiny (40-100 order) of low density zeolite aerating biological filter pool filler preparation use of the present invention; Compare with the particulate zeolites (3-6mm) of direct broken preparation; Increase the micron order void volume greatly, reduced the solute resistance to mass transfer, improved absorption and bio-regeneration speed.
6, low density aerating biological filter pool filler of the present invention is through the ammonia nitrogen and the organism of enriching low-concentration; Improve the required substrate concentration of microbial metabolism such as nitrifier; Improve nitration reaction speed; Utilize the biological nitration effect, realize the dynamic regeneration of zeolite, solve the difficult problem that regeneration cost is high, operation easier is big behind the zeolite adsorption ammonia nitrogen.
7, the cement in the raw material of the present invention is not only the sticker of particulate material, and has the effect of absorption phosphorus, and material of the present invention has the synchronous denitrification dephosphorizing effect.
Four, description of drawings
Fig. 1 is the low density zeolite aerating biological filter pool filler photo that the present invention prepares.
Fig. 2 is the low density zeolite aerating biological filter pool filler particle section field emission scanning electron microscope image that the present invention prepares; Show the inner a large amount of microns hole that exists of low density zeolite aerating biological filter pool filler; Mikrobe can get into filtrate inside, has improved the load of microorganisms amount.
Fig. 3 is a section field emission scanning electron microscope image behind the low density zeolite aerating biological filter pool filler particulate load mikrobe for preparing of the present invention, shows a large amount of mikrobes that distribute in the low density zeolite aerating biological filter pool filler internal void.
Aeration biological filter chamber treatment system total phosphorus and COD clearance that the low density zeolite aerating biological filter pool filler that Fig. 4 is to use the present invention to prepare obtains.
Five, embodiment
With the expanded plastic particle is kernel; No. 425 cement are sticker; The natural zeolite particle is that shell prepares low density zeolite aerating biological filter pool filler, and wherein the expanded plastic particle is that Gongyi City ultra clean water material factory produces EPS type foaming polyphenyl plastics, and non-limiting examples is narrated as follows.
Embodiment 1:
In the present embodiment low density zeolite aerating biological filter pool filler by mass percentage its raw material constitute: zeolite ore 750g; No. 425 cement 250g; Expanded plastic particle diameter 2-4mm, the volume sum of zeolite ore and cement and expanded plastic particulate volume ratio are 2: 1.
The preparation method of low density zeolite aerating biological filter pool filler operates according to the following steps in the present embodiment:
A, zeolite ore pulverized obtain 40-100 purpose zeolite powder, zeolite powder and No. 425 cement are joined in the mixer mixed 30 minutes, make two kinds of raw materials mix even compounds;
B, in pan-pelletizer, be sprinkled into the expanded plastic particle; The even water spray on expanded plastic particulate surface makes its moistened surface, at the uniform velocity is sprinkled into compound that step a obtains then and sprays water to particle surface; The mass ratio of injection flow rate and said compound is 1: 2-2: 1; Pan-pelletizer rotating speed uniform rotation with 5-30r/min in horizontal plane progressively is coated on the expanded plastic particle compound, and along with particle rolls in pan-pelletizer, particle diameter constantly increases; When particle diameter stops to add compound and blanking from pan-pelletizer during for 4-10mm, store up normal temperature naturally and leave standstill moisture-keeping maintaining and got final product in 10 days.
The low density zeolite aerating biological filter pool filler apparent particle density 1.2g/cm of present embodiment preparation
3Granule strength 70N.
Embodiment 2:
In the present embodiment low density zeolite aerating biological filter pool filler by mass percentage its raw material constitute: zeolite ore 1200g; No. 425 cement 200g; The expanded plastic particle, diameter 2-4mm, the volume sum of zeolite ore and cement and expanded plastic particulate volume ratio are 1: 2.
The preparation method of low density zeolite aerating biological filter pool filler operates according to the following steps in the present embodiment:
A, zeolite ore pulverized obtain 40-100 purpose zeolite powder, zeolite powder and No. 425 cement are joined in the mixer mixed 30 minutes, make two kinds of raw materials mix even compounds;
B, in pan-pelletizer, be sprinkled into the expanded plastic particle; The even water spray on expanded plastic particulate surface makes its moistened surface, at the uniform velocity is sprinkled into compound that step a obtains then and sprays water to particle surface; The mass ratio of injection flow rate and said compound is 1: 2-2: 1; Pan-pelletizer rotating speed uniform rotation with 25-60r/min in horizontal plane progressively is coated on the expanded plastic particle compound, and along with particle rolls in pan-pelletizer, particle diameter constantly increases; When particle diameter stops to add compound and blanking from pan-pelletizer during for 4-10mm, store up normal temperature naturally and leave standstill moisture-keeping maintaining and got final product in 15 days.
The low density zeolite aerating biological filter pool filler apparent particle density 1.3g/cm of present embodiment preparation
3Granule strength 55N.
Embodiment 3:
In the present embodiment low density zeolite aerating biological filter pool filler by mass percentage its raw material constitute: zeolite ore 800g; No. 425 cement 200g; The expanded plastic particle, diameter 2-4mm, the volume sum of zeolite ore and cement and expanded plastic particulate volume ratio are 1: 1.
The preparation method of low density zeolite aerating biological filter pool filler operates according to the following steps in the present embodiment:
A, zeolite ore pulverized obtain 40-100 purpose zeolite powder, zeolite powder and No. 425 cement are joined in the mixer mixed 30 minutes, make two kinds of raw materials mix even compounds;
B, in pan-pelletizer, be sprinkled into the expanded plastic particle; The even water spray on expanded plastic particulate surface makes its moistened surface, at the uniform velocity is sprinkled into compound that step a obtains then and sprays water to particle surface; The mass ratio of injection flow rate and said compound is 1: 2-2: 1; Pan-pelletizer rotating speed uniform rotation with 60-100r/min in horizontal plane progressively is coated on the expanded plastic particle compound, and along with particle rolls in pan-pelletizer, particle diameter constantly increases; When particle diameter stops to add compound and blanking from pan-pelletizer during for 4-10mm, store up normal temperature naturally and leave standstill moisture-keeping maintaining and got final product in 20 days.
The low density zeolite aerating biological filter pool filler apparent particle density 1.25g/cm of present embodiment preparation
3Granule strength 65N.
Water treatment:
The low density zeolite aerating biological filter pool filler that embodiment 1-3 is prepared is packed into the testing column of diameter 150mm, height 200mm, filler virtual height 1400mm.The nitrogenous micro-polluted water of simulation of preparation ammonia nitrogen concentration 10mg/L, COD50mg/L.In testing column, inoculate domestic sludge, with the ammonia nitrogen water water inlet of preparation, by GWR blast aeration in 3: 1.Detect the water outlet ammonia nitrogen concentration with spectrophotometry, potassium dichromate process detects effluent COD concentration.17 ℃ of envrionment temperatures; Move water outlet ammonia nitrogen and COD concentration stabilize after 10 days, show that particle surface forms sophisticated microbial film, the water outlet ammonia nitrogen concentration is less than 1mg/L; COD concentration is less than 25mg/L; Ammonia nitrogen and COD clearance reach 90% and 50% respectively, and effluent quality reaches III class surface water body water quality standard, can be used as landscape water.
Claims (2)
1. low density zeolite aerating biological filter pool filler is characterized in that: said filler is to be kernel with the expanded plastic particle, is the low density zeolite aerating biological filter pool filler that shell forms with the natural zeolite particle;
Said filler its raw material by mass percentage constitutes: zeolite ore, cement and expanded plastic particle; Wherein the mass ratio of zeolite ore and cement is 3:1-6:1, and the volume sum of zeolite ore and cement and expanded plastic particulate volume ratio are 2:1-1:2; Said expanded plastic grain diameter is 2-4mm;
Said filler is the filler for preparing through following method:
A, zeolite ore pulverized obtain 40-100 purpose zeolite powder, zeolite powder and cement mixing are got compound;
B, in pan-pelletizer, be sprinkled into the expanded plastic particle; Evenly water spray makes its moistened surface on expanded plastic particulate surface; At the uniform velocity be sprinkled into compound that step a obtains then and simultaneously to the particle surface water spray, the mass ratio of injection flow rate and said compound is 1:2-2:1, pan-pelletizer uniform rotation in horizontal plane progressively is coated on the expanded plastic particle said compound; When particle diameter stops to add compound and blanking from pan-pelletizer during for 4-10mm, store up normal temperature naturally and leave standstill and be no less than 5 days.
2. the preparation method of the described low density zeolite of claim 1 aerating biological filter pool filler is characterized in that operating according to the following steps:
A, zeolite ore pulverized obtain 40-100 purpose zeolite powder, zeolite powder and cement mixing are got compound;
B, in pan-pelletizer, be sprinkled into the expanded plastic particle; Evenly water spray makes its moistened surface on expanded plastic particulate surface; At the uniform velocity be sprinkled into compound that step a obtains then and simultaneously to the particle surface water spray, the mass ratio of injection flow rate and said compound is 1:2-2:1, pan-pelletizer uniform rotation in horizontal plane progressively is coated on the expanded plastic particle said compound; When particle diameter stops to add compound and blanking from pan-pelletizer during for 4-10mm, store up normal temperature naturally and leave standstill and be no less than 5 days;
Said expanded plastic grain diameter is 2-4mm.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102718311B (en) * | 2012-07-06 | 2014-08-20 | 江苏蓝星环保科技有限公司 | Method for deeply treating wastewater containing ammonia nitrogen |
| CN105884026B (en) * | 2016-04-27 | 2019-04-02 | 北京清源中科环保科技有限公司 | A kind of method of the microbe carrier and the formula pollution administration water body that drifts along of core shell structure |
| CN106396725A (en) * | 2016-07-25 | 2017-02-15 | 清水源（上海）环保科技有限公司 | A preparing method of a lightweight ceramsite biological filter material |
| CN110734128B (en) * | 2019-11-06 | 2022-01-28 | 合肥学院 | Nano zero-valent metal light porous spherical functional material prepared based on meteorite, and preparation method and application thereof |
| CN111704237A (en) * | 2020-05-21 | 2020-09-25 | 湖州美欣达环保产业研究有限公司 | Biological filler for improving BAF and preparation method thereof |
| CN113044963A (en) * | 2021-03-15 | 2021-06-29 | 广东昂为环保产业有限公司 | Active biological filter material and preparation method and application thereof |
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| JP2000061487A (en) * | 1998-08-25 | 2000-02-29 | Kankyo Eng Co Ltd | Carrier for microorganism and its production |
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| CN2285287Y (en) * | 1997-01-15 | 1998-07-01 | 陈耀章 | Low-density fibre sheaf soft padding |
| CN1205988A (en) * | 1998-07-23 | 1999-01-27 | 中山大学 | Light anticorrosive aeration turn plate and its manufacture |
| CN101307843A (en) * | 2007-05-17 | 2008-11-19 | 北京建筑材料科学研究总院有限公司 | Manufacture method of antibiotic plastic pipes for water supply |
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