CN101759281B - Double-layer compound biological filter material for aerated biological filter and method for preparing same - Google Patents
Double-layer compound biological filter material for aerated biological filter and method for preparing same Download PDFInfo
- Publication number
- CN101759281B CN101759281B CN2010100183837A CN201010018383A CN101759281B CN 101759281 B CN101759281 B CN 101759281B CN 2010100183837 A CN2010100183837 A CN 2010100183837A CN 201010018383 A CN201010018383 A CN 201010018383A CN 101759281 B CN101759281 B CN 101759281B
- Authority
- CN
- China
- Prior art keywords
- biological filter
- layer compound
- spheres
- recessed soil
- double
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes
-
- 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
Landscapes
- Water Treatment By Sorption (AREA)
- Biological Treatment Of Waste Water (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
The invention discloses a double-layer compound biological filter material for an aerated biological filter. The double-layer compound biological filter material is formed by combining an inner layer and an outer layer, wherein the inner layer consists of attapulgite clay and fly ash in a weight ratio of 4:6; and the outer layer consists of attapulgite clay, kieselguhr and coal dust in a weight ratio of 7-10:9-12:1. The preparation method comprises the following steps of: uniformly mixing the attapulgite clay and the fly ash, and forming inner cores of solid spheres in a granulator; uniformly mixing the attapulgite clay, the kieselguhr and the coal dust to obtain mixed powder, continuously and slowly adding the mixed powder into the granulator to coat the surfaces of the inner cores of the solid spheres for granulation to obtain the finished product spheres; and drying the finished spheres naturally for 24 hours and in a constant-temperature fan drying box at the temperature of 120 DEG C for 2 hours, taking the finished spheres out of the drying box, directly putting the finished spheres in a box-typed resistance furnace to sinter the finished spheres at the temperature of between 950 and 1.050 DEG C for 20 minutes, and naturally cooling the finished spheres to obtain the double-layer compound biological filter material. The double-layer compound biological filter material obtained by the preparation method has the advantages of rough surface, high void ratio, good wearing resistance, high strength, easy film formation and high economy and practicability.
Description
Technical field
The present invention relates to filtrate and preparation method, be specifically related to a kind of double-layer compound biological filter material for aerated biological filter and preparation method thereof.
Background technology
As everyone knows, in biomembrance process, BAF is one of visual plant, (Biological Aerated Filter BAF) has that technology is simple, processing efficiency is high, floor space is little, organic volumetric loading is big, the residence time is short, integrates bio-oxidation and holds back suspended solids, saves second pond, less investment, low, the effluent quality advantages of higher of energy consumption BAF; In use, filtrate forms microbial film in the filter tank, and microbial film is made up of bacterium, fungi, algae, protozoon, metazoan etc.; When effluent stream during through filter bed, some pollutent and bacterial adhesion are on filter material surface, and microorganism just breeds in a large number at filter material surface, forms one deck microbial film, and its thickness is about 2mm; Organic pollutant in the sewage is degraded through the microorganism aerobic metabolism, and product is CO
2, H
2O, NH
3Deng; The microorganism of microbial film internal layer then carries out anaerobic metabolism, and product is organic acid, ethanol and H
2S etc.; Because the continuous breeding of microorganism, the microbial film progressive additive is when surpassing certain thickness, the internal layer microorganism enters endogenous metabolism because of can not get sufficient nutriment, lose it and stick to performance on the filtrate, split away off with water and flow out the filter tank, filter material surface grows new microbial film more again; The physical and chemical performance of filter material surface affects microbial growth, breeds, comes off and form; Filtrate itself can also adsorb and hold back the suspended substance in the sewage, stops bubble, and it is long-pending to increase gentle, liquid surface in contact of its residence time in water, reduces aeration rate, thus save energy, and reduce equipment volume; Therefore, the research and development of high-performance biofilter material is the key of BAF technology.
At present, biofilter material is mainly organic polymer filtrate and inorganic filtrate; The organic polymer filtrate has polystyrene, polyvinyl chloride, polypropylene etc., and the consistency between they and microorganism is relatively poor, and biomass is few during biofilm, easily comes off, and treatment effect is not so good, and costs an arm and a leg, and uses few in BAF technology; Inorganic filtrate mainly contains quartz sand, volcanics, gac, hard coal, zeolite etc.; Quartz sand now substantially uses separately owing to there are shortcomings such as density is big, specific surface area is little, porosity is low, the filter tank cycle of operation short, head loss increases comparatively fast, wash-down water consumption is big; Gac and volcanics price are expensive; Hard coal, zeolite pore are less relatively, easily stop up, and the back flushing resistance is bigger.
Because the existing various defectives of lithotroph filtrate, the filtrate expert has carried out a large amount of study on the modification to it both at home and abroad, mainly is divided into filter material surface modification and composite modified research; Can make after the surface modification that the little filtrate micropore of porosity increases, specific surface area becomes big, the active centre of having enriched solid surface has strengthened it and has removed the performance of foreign ion in water, and filter effect is improved, effluent quality obviously improves; Composite filtering material mainly is all kinds of ceramic grain filters, and its wide material sources can be at different quality; The lithotroph filtrate of various modifications becomes the main body of BAF filtrate gradually.
On September 28th, 2005 Granted publication CN1220543C patent " a kind of bioactive filter material and roasting technology thereof that is used for water treatment ", the employing clay is a main raw material, with xylogen and sulfonate as fluidizer, polyvinyl alcohol is as preparation filtrates such as whipping agents, but in the actual use, COD and ammonia nitrogen removal frank are not high, are to the maximum about 70%.
On December 27th, 2006 Granted publication CN1291926C patent " a kind of manufacture method that is used for wastewater treatment ball-type ature of coal micropore biofilter material ", adopt coal and binding agent after balling-up in 100～600 ℃ of shapings; On October 8th, 2008 Granted publication CN100423808C patent " production method of concave convex stick ceramic grain filter ", adopt attapulgite clay, coal gangue, volcanic ash at 350～500 ℃ of thermal sinterings; More than two patents since the thermal sintering temperature low, do not reach the potteryization temperature, sour corrosion rate and alkali corrosion rate are higher, intensity and wear resistance are relatively poor, can be used for the sorbent material of purification of water quality, but be not suitable as the filtrate use of BAF, because not anti-back flushing.
On December 19th, 2007 Granted publication CN100355671C patent " a kind of novel filtrate that is applied in the biological aerated filter technology ", adopt preparation filtrates such as flyash, cement, sepiolite, owing to be to prepare gained by cement ageing maintenance, intensity and porosity are not as the ceramic grain filter of high temperature sintering.
On July 23rd, 2008 Granted publication CN101224359A patent " but preparation method of suspended compound clay filtering material ", adopt the recessed soil of polyethylene foamed surface coverage, the sample of preparation can suspend, relatively being fit to fish culture waste water handles, since bigger from suspension rolling collision friction in water, not too be fit to the BAF biofilm.
On September 10th, 2008 Granted publication CN100417605C patent " highly effective filtering material for biology and preparation method thereof ", adopting laterite and flyash to pulverize 1050～1250 ℃ of agglomerating backs of sintering makes, because the laterite porosity is less, the filtrate specific surface of preparation is also less, and irregular filtrate has increased flow resistance, the backwashing pressure of needs raising BAF.
On October 29th, 2008 Granted publication CN101293768A patent " a kind of biofilter material and preparation method thereof "; adopt clay, flyash, pore-forming material etc. to be prepared from; pore-forming material is that price is relatively costly, very active, the dangerous high calcium carbide of chemical property, has promoted the preparation cost of filtrate.
On January 21st, 2009 Granted publication CN100453503C patent " Biohaydite filter material and preparation method thereof ", adopting flyash, mud, Walocel MT 20.000PV is the adhesive preparation filtrate, and be coated with the iron modification by the surface, improve ammonia nitrogen Static Adsorption ability, but little to the bio-film colonization effect.
Summary of the invention
The objective of the invention is to: provide a kind of double-layer compound biological filter material for aerated biological filter and preparation method thereof, the two-layer compound biofilter material surface irregularity that adopts this preparation method to obtain, voidage height, wear resistance is good, intensity is big, and easy to be filmed is economical and practical.
Technical solution of the present invention is: this two-layer compound biofilter material is composited by ectonexine; Internal layer is made up of recessed soil and flyash, and its weight ratio is 4: 6; Skin is made up of recessed soil, diatomite and coal dust, and its weight ratio is 7-10: 9-12: 1.
The preparation method of two-layer compound biofilter material of the present invention is: at first, recessed soil and flyash are worn into 100 purpose powder respectively, and 100 order powder of recessed soil and flyash mixed by weight 4: 6, were the solid globule core of particle diameter 5～6mm at the tablets press internal shaping; Secondly, recessed soil, diatomite, coal dust are worn into 100 purpose powder respectively, 100 order powder of recessed soil, diatomite, coal dust are 7-10: 9-12 by weight: 1 mixes, powder mix slowly adds in the tablets press continuously, continuation coats granulation on solid globule core surface, and obtaining diameter is the finished product bead of 7～8mm; At last, the finished product bead dried 24 hours naturally, and 120 ℃ of dry 2h take out in the constant temperature air dry oven, directly are put into 950 ℃～1050 ℃ sintering 20min in the chamber type electric resistance furnace, and naturally cooling gets the two-layer compound biofilter material.
The present invention has the following advantages: 1, verified the two-layer compound biofilter material by a large amount of dynamic experiments, outer field component films performance is good, and the component of internal layer is relatively inexpensive, and integral body has moderate porosity, kernel intensity height;
2, attapulgite clay (being called for short recessed soil) is a kind of silicate of rich magnesium, and crystalline structure belongs to 2:1 type layer chain clay mineral, and structure that it is special and character have been given very high use value; It has bigger specific surface area on the one hand, can be used as good filtrate component; Recessed on the other hand soil self has good stickiness, is convenient to filtrate and is shaped, and need not add other binding agent again; Attapulgite mineral various places almost all over the world, many attapulgites ore deposit point is verified on ground such as China Jiangsu, Anhui, Shandong, Liaoning, output ranks first with the area, Xuyi in Huaian, Jiangsu, its reserves have now been verified up to 2.72 hundred million tons, prospective reserves reaches 500,000,000 tons, account for 70% of Chinese attapulgite reserves, account for the nearly 50% of global attapulgite total reserves, be world's high-quality mineral reserve;
3, diatom is a kind of microbody siliceous organism of living in sea or the lake basin ground, genus polyporus shell unicellular algae, individual diameter is only differentiated at microscopically, diatom experience natural propagation process is dead to the end, the organic disappearance, bone sinks under water and can form the diatom accumulation, under suitable sedimentary environment and geologic condition, be piled into the diatomite mineral deposit, at present in Jilin, Yunnan, 14 provinces such as Zhejiang, autonomous region has found diatomite ore, in the mineral deposit of having found, with the Changbai mountain, Jilin area, Shengzhou, Zhejiang city is largest, reserves are maximum, reserves are all more than hundred million tons, occupy prostatitis, the world, because diatomite has unique microvoid structure, the porosity height, in light weight, therefore physical propertiess such as strong adsorptivity are widely used among the industrial and agricultural production, just because of itself being exactly to form after the microorganism silication, formed space is particularly suitable for microbial growth in the microbial film;
4, flyash is a kind of solid waste of discharging in the coal-fired process, the a large amount of flyash of the annual discharging of coal-fired enterprise such as power station, as not dealing carefully with, will cause serious environmental to pollute, flyash is in forming process, and portion gas is not overflowed to be rolled in and formed the closure hole in the particle, though inside is cellular, absorption property is but very little, not as recessed soil and diatomite, but cheap and easy to get;
5, learn by a large amount of tests, the biofilter material of recessed soil and the compound preparation of diatomite is used for the BAF biofilm and disposes of sewage, over-all properties obviously is better than recessed soil and flyash compound biofilter material, the microbial film general thickness that the filtrate outside surface forms is 2mm, the filtrate solid object surface then is the place of microbial reproduction growth, mainly concentrate on the thick upper layer of the about 1mm of filtrate, because diatomite belongs to nonmetalliferous ore, price is far above the flyash of waste, therefore, biofilter material newly developed adopts bilayer structure, and inside is recessed soil and flyash complex body, outermost layer is recessed soil, the composite bed of diatomite and coal dust, with low cost;
6, expanding agent adopts coal dust, promptly forms by cleaned coal is levigate, and moderate cost, quality are easy to control;
7, the adding of expanding agent coal dust can form bigger duct, inside, helps microorganism growth on the filtrate, obtains moderate voidage and higher compressive strength, long service life;
8, the maturing temperature scope is 950 ℃～1050 ℃, reaches the potteryization temperature, and sour corrosion rate and alkali corrosion rate are lower, and particle surface part glazing can not occur, and internal capillary can fusion yet, and filtrate available ratio surface increases, and helps biofilm.
Embodiment
Describe technical solution of the present invention in detail below in conjunction with specific embodiment, these embodiment can not be interpreted as it is restriction to technical scheme.
Embodiment 1:
Recessed soil and flyash are worn into 100 purpose powder respectively, and 100 order powder of recessed soil and flyash mixed by weight 4: 6, were prepared as the solid globule core of particle diameter 5～6mm in tablets press; Recessed soil, diatomite, coal dust are worn into 100 purpose powder respectively, 100 order powder of recessed soil, diatomite, coal dust are to mix at 7: 12: 1 by weight, slowly add in the tablets press continuously, continue to coat granulation on solid globule core surface, obtaining diameter is the finished product bead of 7～8mm; Naturally dried 24 hours, 120 ℃ of dry 2h take out in the constant temperature air dry oven, directly are put into 1000 ℃ of sintering 20min in the chamber type electric resistance furnace, and naturally cooling is the two-layer compound biofilter material.
After the BAF biofilm, normal water inlet, measure entry COD and be about 380～390mg/L, NH3-N is about 9～12mg/L, hydraulic detention time is about 4 hours, the water treatment effect is basicly stable after 14 days, and water outlet COD average removal rate was 85.3% in back again 5 days, and the NH3-N average removal rate is 93.2%.
Embodiment 2:
Recessed soil and flyash are worn into 100 purpose powder respectively, and 100 order powder of recessed soil and flyash mixed by weight 4: 6, were prepared as the solid globule core of particle diameter 5～6mm in tablets press; Recessed soil, diatomite, coal dust are worn into 100 purpose powder respectively, 100 order powder of recessed soil, diatomite, coal dust are to mix at 7: 12: 1 by weight, slowly add in the tablets press continuously, continue to coat granulation on solid globule core surface, obtaining diameter is the finished product bead of 7～8mm; Naturally dried 24 hours, 120 ℃ of dry 2h take out in the constant temperature air dry oven, directly are put into 950 ℃ of sintering 20min in the chamber type electric resistance furnace, and naturally cooling is the two-layer compound biofilter material.The water treatment effect is basicly stable after 14 days, and water outlet COD average removal rate was 89.5% in back again 5 days, and the NH3-N average removal rate is 96.4%.
Embodiment 3:
Recessed soil and flyash are worn into 100 purpose powder respectively, and 100 order powder of recessed soil and flyash mixed by weight 4: 6, were prepared as the solid globule core of particle diameter 5～6mm in tablets press; Recessed soil, diatomite, coal dust are worn into 100 purpose powder respectively, 100 order powder of recessed soil, diatomite, coal dust are to mix at 7: 12: 1 by weight, slowly add in the tablets press continuously, continue to coat granulation on solid globule core surface, obtaining diameter is the finished product bead of 7～8mm; Naturally dried 24 hours, 120 ℃ of dry 2h take out in the constant temperature air dry oven, directly are put into 1050 ℃ of sintering 20min in the chamber type electric resistance furnace, and naturally cooling is the two-layer compound biofilter material.The water treatment effect is basicly stable after 14 days, and water outlet COD average removal rate was 87.4% in back again 5 days, NH
3-N average removal rate is 94.6%.
Embodiment 4:
Except continue to add recessed soil, diatomite, coal dust solid globule core is 8.5: 10.5: 1 powder mix by weight, and granulation is the finished product bead of 7～8mm, and all the other conditions are constant with embodiment 1.The water treatment effect is basicly stable after 14 days, and water outlet COD average removal rate was 81.5% in back again 5 days, NH
3-N average removal rate is 89.7%.
Embodiment 5:
Except continue to add recessed soil, diatomite, carbon dust weight ratio solid globule core is 8.5: 10.5: 1 powder, and granulation is the finished product bead of 7～8mm, and all the other conditions are constant with embodiment 2.The water treatment effect is basicly stable after 14 days, and water outlet COD average removal rate was 84.3% in back again 5 days, NH
3-N average removal rate is 92.6%.
Embodiment 6:
Except continue to add recessed soil, diatomite, carbon dust weight ratio solid globule core is 10: 9: 1 powder, and granulation is the finished product bead of 7～8mm, and all the other conditions are constant with embodiment 3.The water treatment effect is basicly stable after 14 days, and water outlet COD average removal rate was 82.1% in back again 5 days, NH
3-N average removal rate is 91.3%.
The concrete numerical value of each composition that embodiments of the invention adopt only is to represent mutual proportionlity, it is not limited to the use of this numerical value in actual applications, can realize purpose of the present invention as long as meet mutual proportionlity, so all should be in protection scope of the present invention; Simultaneously; because the existence of permissible error is arranged in preparation process; the numerical value that the present invention mentioned also just has the meaning of directiveness, so as long as used the preparation and the modified condition of process of the present invention in actual applications, promptly should be in protection scope of the present invention.
Claims (1)
1. double-layer compound biological filter material for aerated biological filter, it is characterized in that: this two-layer compound biofilter material is composited by ectonexine; Internal layer is made up of recessed soil and flyash, and its weight ratio is 4: 6; Skin is made up of recessed soil, diatomite and coal dust, and its weight ratio is 7-10: 9-12: 1; The preparation method of described two-layer compound biofilter material may further comprise the steps: at first, recessed soil and flyash are worn into 100 purpose powder respectively, 100 order powder of recessed soil and flyash mixed by weight 4: 6, were the solid globule core of particle diameter 5～6mm at the tablets press internal shaping; Secondly, recessed soil, diatomite, coal dust are worn into 100 purpose powder respectively, 100 order powder of recessed soil, diatomite, coal dust are 7-10: 9-12 by weight: 1 mixes, powder mix slowly adds in the tablets press continuously, continuation coats granulation on solid globule core surface, and obtaining diameter is the finished product bead of 7～8mm; At last, the finished product bead dried 24 hours naturally, and 120 ℃ of dry 2h take out in the constant temperature air dry oven, directly are put into 950 ℃～1050 ℃ sintering 20min in the chamber type electric resistance furnace, and naturally cooling is the two-layer compound biofilter material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100183837A CN101759281B (en) | 2010-01-15 | 2010-01-15 | Double-layer compound biological filter material for aerated biological filter and method for preparing same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010100183837A CN101759281B (en) | 2010-01-15 | 2010-01-15 | Double-layer compound biological filter material for aerated biological filter and method for preparing same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101759281A CN101759281A (en) | 2010-06-30 |
| CN101759281B true CN101759281B (en) | 2011-12-21 |
Family
ID=42490687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010100183837A Expired - Fee Related CN101759281B (en) | 2010-01-15 | 2010-01-15 | Double-layer compound biological filter material for aerated biological filter and method for preparing same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101759281B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103951391B (en) * | 2014-04-09 | 2015-07-29 | 北京工业大学 | A kind ofly widen the method that coal gangue-red mud porcelain granule burns swollen temperature |
| CN104478162B (en) * | 2014-11-27 | 2016-03-02 | 武汉大学 | A kind of biological filter of applicable network of rivers type ditches at villages sewage disposal |
| CN104828934A (en) * | 2015-05-19 | 2015-08-12 | 傅成义 | Efficient denitrification bio-aerating filter filler and preparation method thereof |
| CN106082441B (en) * | 2016-08-18 | 2019-04-23 | 苏州首创嘉净环保科技股份有限公司 | A kind of composite biological packing and preparation method thereof |
| CN109694234A (en) * | 2019-02-26 | 2019-04-30 | 北京建筑大学 | The method for preparing water-permeable brick using waterworks sludge |
| CN110790365B (en) * | 2019-11-24 | 2022-04-26 | 南京山禾生态环境有限公司 | Attapulgite-based light dual-core filter material and preparation method thereof |
| CN114436627A (en) * | 2022-01-25 | 2022-05-06 | 安徽华骐环保科技股份有限公司 | Deodorizing ceramsite and preparation method thereof |
-
2010
- 2010-01-15 CN CN2010100183837A patent/CN101759281B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN101759281A (en) | 2010-06-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101759281B (en) | Double-layer compound biological filter material for aerated biological filter and method for preparing same | |
| CN102583719B (en) | Active composite suspended filler | |
| CN102674530B (en) | Suspended electrobiological filler for removing ammonia nitrogen from water, preparation method for suspended electrobiological filler and application of suspended electrobiological filler | |
| CN101585563B (en) | New composite water purifying agent and a preparation method thereof | |
| CN101691547B (en) | Method for restoring micro-scale polluted reservoir water by using situ bio-contact oxidation | |
| CN100420640C (en) | Lightweight highly effective filtering material for biology and its preparation method | |
| CN101948173A (en) | Composite filler for biological aerated filter and biological filter structure | |
| CN112174628A (en) | Preparation method of non-sintered ceramsite with Fenton-like reaction property | |
| KR101344922B1 (en) | Moss brick for purifying water and method for preparing the same | |
| CN103951044B (en) | A kind of non-sintered rapid biofilm biologic packing material and preparation method thereof | |
| CN1321918C (en) | Fixed microbial suspension ceramic carrier and production thereof | |
| CN111333200A (en) | Embedded immobilized microorganism particles, preparation method and sewage treatment method | |
| CN112321255A (en) | Pervious concrete with biological water purification function and preparation method thereof | |
| CN101898115B (en) | Filter medium, preparation method thereof, filter element and water purification device | |
| CN101428901B (en) | Bamboo charcoal-polyvinyl formal biological carrier and preparation thereof | |
| CN113860497A (en) | Urban and municipal sewage nitrogen and phosphorus removal filler and preparation method thereof | |
| CN101569856B (en) | Filtering medium for removing metallic lead in water and preparation method thereof | |
| CN103922484A (en) | Filter material of biofilter and preparation method thereof | |
| CN108217968B (en) | Water body treatment member and preparation method and application thereof | |
| KR100310877B1 (en) | Ceramic Carrier and its Manufacturing Method | |
| CN100417605C (en) | Highly effective filtering material for biology and its preparation method | |
| CN108002524B (en) | Modified aeration biological filter composite filler and preparation method thereof | |
| CN117886578B (en) | Light slow-release filler, light slow-release filler brick, and preparation methods and applications thereof | |
| CN112441661A (en) | Polymer composite carrier for water treatment and preparation method and application thereof | |
| KR101188101B1 (en) | Water purification block and manufacturing methods of it |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111221 Termination date: 20130115 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |