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WO2001025157A1 - Matiere utilisee dans la denitrification afin d'eliminer l'azote des nitrates et son procede de preparation - Google Patents

Matiere utilisee dans la denitrification afin d'eliminer l'azote des nitrates et son procede de preparation Download PDF

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Publication number
WO2001025157A1
WO2001025157A1 PCT/JP2000/006777 JP0006777W WO0125157A1 WO 2001025157 A1 WO2001025157 A1 WO 2001025157A1 JP 0006777 W JP0006777 W JP 0006777W WO 0125157 A1 WO0125157 A1 WO 0125157A1
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WO
WIPO (PCT)
Prior art keywords
sulfur
denitrification
nitrate nitrogen
powder
calcium carbonate
Prior art date
Application number
PCT/JP2000/006777
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English (en)
Japanese (ja)
Inventor
Tomomichi Gunji
Atsushi Yatagai
Toru Oishi
Original Assignee
Nitchitsu Co., Ltd.
Nippon Steel Chemical Co., Ltd.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from JP28207799A external-priority patent/JP4269086B2/ja
Priority claimed from JP2000264564A external-priority patent/JP4269087B2/ja
Application filed by Nitchitsu Co., Ltd., Nippon Steel Chemical Co., Ltd. filed Critical Nitchitsu Co., Ltd.
Publication of WO2001025157A1 publication Critical patent/WO2001025157A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/10—Packings; Fillings; Grids
    • 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

Definitions

  • the present invention relates to a material for removing nitrate nitrogen (hereinafter, also referred to as a material for denitrification) for removing nitrate nitrogen such as nitrate ions and nitrite ions by microorganisms, and a method for producing the same.
  • This material for denitrification is used as a substrate for water purification or microbial culture solution.
  • heterotrophic denitrification and autotrophic denitrification are known as techniques for removing nitrate nitrogen from wastewater or environmental water.
  • Heterotrophic denitrification is a method of denitrification using the organic carbon source in methanol-sludge as a hydrogen donor.
  • the heterotrophic denitrification method is problematic in that it is easily affected by decomposition systems other than the target bacterium, and the denitrification efficiency per substrate is low.
  • Autotrophic denitrification is a method of denitrifying mainly sulfur and sulfur compounds as a nutrient source. In this autotrophic denitrification method, bacteria that denitrify using sulfur as a substrate, such as Thiobacillus Denitrificans, are used.
  • denitrification is selectively performed by the action of denitrifying microorganisms that use sulfur (collectively, denitrifying bacteria), the denitrification efficiency per substrate is high. Also, if the product sulfate ion is completely neutralized, it will not be a limiting factor in the water quality environment, and the effect of wastewater on ecosystems outside the reaction system will be small.
  • Japanese Patent Publication No. 62-56798 Japanese Patent Publication No. 63-45274, Japanese Patent Publication No. 60-3876, Japanese Patent Publication No. 3
  • Japanese Patent Publication No. Hei 04-9119 Japanese Patent Laid-Open No. 04-74598
  • Japanese Patent Laid-Open No. 04-151000 Japanese Patent Laid-Open No. 04-197498
  • Japanese Patent Laid-Open No. 06-182393 Has been proposed.
  • This denitrification composition enables efficient denitrification.Also, calcium ions and sulfate ions generated in the denitrification system can be kept approximately neutral in almost equal amounts, It is preferable because the denitrification capacity does not decrease due to the decrease.
  • the denitrification composition is obtained by heating and melting sulfur, mixing it with calcium carbonate powder or other powder raw materials, and rapidly cooling the slurry-like mixed composition. It is disclosed to be manufactured.
  • a composition excellent in strength can be obtained by rapidly cooling and solidifying a material obtained by sufficiently melting and mixing the raw materials, and other powder raw materials can be added to the sulfur matrix.
  • the structure can be uniformly dispersed, and the solidified body can be crushed to form a fractured surface with many microprojections.
  • the present inventors have also proposed a denitrification material which can be in contact with wastewater even at the time of water and can always maintain a high denitrification rate.
  • a composite denitrification material consisting of a mixture of mineral fibers and a denitrification material coexisting with calcium carbonate-containing substances and sulfur.
  • the inclusion of granular rock wool and denitrifying materials ensures water retention and a home for denitrifying bacteria. And stable nitric nitrogen denitrification is realized.
  • the present invention does not require the supply of an essential carbon source for microorganisms, has excellent balance in the system before and after the reaction, and has a stable function with little influence of pH and chemical substances on water bodies.
  • An object of the present invention is to provide a material for denitrification for removing nitrate nitrogen by a microorganism that exerts its effect.
  • Another object of the present invention is to provide a method for producing the above-mentioned denitrification material, which can produce sulfur as a main raw material in powder form by pressure molding.
  • the present invention provides a method for producing a denitrifying material that can efficiently coexist with denitrifying bacteria without killing or pyrolyzing denitrifying bacteria and other micronutrients. Aim.
  • the present invention relates to a method in which a powder containing calcium carbonate and a powder containing sulfur are used as main raw materials, and the mixture is mixed to form a powder mixture. And a method for producing a material for removing nitrate nitrogen. Further, the present invention provides a powder containing 2,000 to 5000 cm 2 Zg of calcium carbonate as a Blaine value and a sulfur-containing powder having an average particle size of 0.01 to 2 mm in a weight ratio of 3 ::!
  • a powder in which denitrifying bacteria are supported on a porous body is mixed with the main raw material as an additive. It is advantageous to use them.
  • the present invention is a material for removing nitrate nitrogen, in which sulfur, mineral fibers or a powder containing mineral fibers and calcium carbonate are integrated.
  • the present invention uses a powder containing sulfur and a powder containing mineral fibers or mineral fibers and calcium carbonate as main raw materials, and melts and mixes them at a temperature equal to or higher than the melting temperature of sulfur.
  • a method for producing a nitrate-nitrogen removing material in the form of a lump or a particle having a predetermined shape or size It is advantageous that these materials for removing nitrate nitrogen contain an additive selected from a cation-exchange-capability retaining substance, a flame retardant, and a microporous substance.
  • mineral fibers mineral fibers such as wool containing calcium are advantageous.
  • Nitrogen-removing materials are selected from materials obtained by the melt-integration method, materials obtained by the press-integration method, and materials with additives added to them. is there.
  • the denitrification material of the present invention is a material for removing nitrate nitrogen such as nitrate ions and nitrite ions.
  • the material for denitrification of the present invention contains calcium carbonate and sulfur as essential components, and, if necessary, a powder having mineral fibers and denitrifying bacteria supported on a porous material; Contains microporous material.
  • the carbon source for denitrifying bacteria synthesis is sufficiently present in the water to be treated and the acidity of the treated water can be separately corrected, the blending of calcium carbonate can be omitted.
  • the blending of calcium carbonate is omitted, it is advantageous to blend mineral fibers containing calcium.
  • This denitrification material is mainly composed of a powder containing calcium carbonate and a powder containing sulfur, which are mixed at a temperature lower than the melting point of sulfur, preferably at room temperature, by powder mixing.
  • a powder mixture is pressed at a temperature lower than the melting point of sulfur, preferably at room temperature.
  • Powders containing calcium carbonate include calcium carbonate, limestone powder, shell powder, shell fossil powder, coral powder, eggshell powder, coral sand powder or crushed material, and other calcareous grains and calcareous fossil powder.
  • One or two or more kinds of materials can be used. In particular, they do not matter in their purity, but they should be low in impurities because they serve as water purification and denitrification materials, but they weigh 70 weight. /. Moderate purity (excluding water) is acceptable.
  • the sulfur-containing powder examples include petroleum desulfurization and coal desulfurization brands, sulfur recovered from exhaust gas desulfurization brands, and natural sulfur. used.
  • the purity of the powder is not limited, but it is preferable that the powder containing sulfur is also free of impurities, but the weight is 70 weight. /. A degree of purity (excluding water) is acceptable.
  • the average particle size of the powder containing calcium carbonate has a Blaine value of 2000 to 5000 cm 2 / g, preferably 2500 to 4000 cm 2 Zg.
  • the average particle size of the sulfur-containing powder is preferably about 0.01 to 2 mm, more preferably about 0.05 to 1.5 mm.
  • a ratio of around 1: 1 is preferable, usually a ratio of 3: 1 to I: 2, preferably 5: 2 to 2: 3, more preferably 6: 5 to 2: 1.
  • the amount of carbonic acid is more than twice the amount of sulfur, the formability is deteriorated, and the denitrification material becomes more easily disintegrated in water. Therefore, it is preferable to limit the amount to at most three times the amount.
  • the material for denitrification according to the present invention which does not require mineral fibers, has a power of mainly using a powder containing calcium carbonate and a powder containing sulfur. Powder supported on the body can be blended.
  • a powder containing calcium carbonate and a powder containing sulfur Powder supported on the body can be blended.
  • the porous material for supporting the denitrifying bacteria inorganic porous materials such as diatomaceous earth, zeolite, pumice, lengah, silica gel, soil and volcanic emissions can be used.
  • clay minerals that swell with water are not suitable for use because they may cause the denitrification material to collapse in water.
  • Carbonaceous porous materials such as activated carbon and rice husk charcoal are also useful, but care must be taken because nitrate nitrogen may increase from unburned matter.
  • the carrier may be immersed in a culture solution of the denitrifying bacteria for several days and then air-dried and pulverized. It is also possible to mix soil containing denitrifying bacteria. In this case, it is advisable to air dry the soil and use a decoration with openings of 75 m. The more the denitrifying bacterial carrier is prepared, the faster the denitrification reaction appears.However, the effect is sufficient until the growth of the bacteria begins.Therefore, the mixing ratio is about 10 wt% of the carbonated sulfur-sulfur mixture. You.
  • the amount of the powder carrying the denitrifying bacteria in the porous body can be added within the range that can be pressed, but the sulfur content is about 1/3 to 2/3 of the whole, preferably 1 / 2 about 2 to 20 weight of the whole. /. Good degree.
  • the denitrification material of the present invention which contains a powder in which a denitrifying bacterium is supported on a porous body, is used for the water quality of a vegetable cultivation plant drainage or industrial wastewater having a low density of denitrifying bacteria, groundwater, etc. Suitable for purification.
  • the above-mentioned denitrification material is mainly composed of powder mainly composed of calcium carbonate and powder mainly composed of sulfur. It is also advantageous to incorporate a small amount of a substance, a substance having a cation exchange capacity, a microporous substance, a flame retardant substance, or the like, preferably 30% by weight or less. As for such compounding substances, those described below can be used.
  • the mixing of the main raw material and the raw material added as required is not particularly limited as long as the raw powder material can be sufficiently mixed.
  • the mixing can be performed using a known powder mixing device.
  • a liquid substance for example, a liquid fertilizer for agriculture, may be used as a nutrient source of the denitrifying bacteria.
  • the liquid substance may be stirred and mixed while being gradually dropped.
  • care must be taken to raise the temperature of the powder raw material.
  • some water such as an aqueous solution may be replenished as described above, but in this case, it is desirable to dry before press molding. However, the presence of a small amount of water is effective in providing a hard molded product.
  • the mixed powder mixture is pressed and hardened.
  • ⁇ Te press molding pressure Nitsu Rere or, 300 ⁇ 900Kg / cm 2 (about 30 ⁇ 90MPa), desired laid (or 400 ⁇ 700KgZ cm 2 (yo when about 40 ⁇ 70MPa) with pressure molding les.
  • the press Batch molding using a flat plate press, continuous molding using a roll briquetter, etc. can be applied to molding. If the molding pressure is low, the service life of the denitrification material is shortened, but an early manifestation of the denitrification effect can be expected. If the molding pressure is high, the effect is delayed, Long life of denitrification material can be expected.
  • the molding pressure when the molding pressure is less than 300 Kgcm2 (about 30 MPa), the denitrification material becomes more disintegratable in water. Conversely, if the molding pressure is 900 KgZ cm 2 (approximately 90 MPa) or more, a phenomenon occurs in which the molded body is destroyed when the pressure is gradually reduced, and the production efficiency is reduced.
  • the temperature is not higher than the melting temperature of sulfur. However, when a denitrifying bacterium is contained, the temperature is not higher than the temperature at which it does not die, for example, not higher than 40 ° C., and preferably not higher than room temperature.
  • the denitrification materials include those that require sulfur and mineral fibers as essential, and those that require sulfur and calcium carbonate powder and mineral fibers, which are integrated so as not to break even in water.
  • sulfur and calcium carbonate used here the same sulfur and calcium carbonate as described above can be used.
  • the mineral fibers for example, one or more of rock wool, glass wool, ceramic wool, and carbon fiber can be used, but preferably they contain calcium and are inexpensive. It is easy-to-granulate, and has a wealth of experience as an agricultural medium. It contains slag wool as well as mouth wool.
  • the water retentivity and granular voids of granular rock wool having a particle size of about 30 to 5 mm not only have a favorable effect on the good growth of microorganisms, but also make it easy to obtain granular materials of an appropriate size. Can be.
  • powdered rock wool provides a favorable effect.
  • the rock wool field As raw materials, steel slag is used in addition to natural rocks.
  • the rock is rich in mineral components such as Mn, Zn, Cu, Mo, Fe, B, etc., and has the effect of being dissolved to activate sulfur-oxidizing bacteria. It also has the effect of summing.
  • Mineral fibers having large voids are suitable for breeding other microorganisms such as ammonia-utilizing bacteria and organic matter-degrading organisms such as protozoa.
  • a cation exchange ability-retaining substance in addition to the above essential components, it is also possible to add a cation exchange ability-retaining substance, a nutrient component, a flame retardant substance, a microporous substance, and the like, if necessary. It is preferable that the content of these components is 30 wt% or less of the whole. It is also desirable that the maximum particle size of the cation-exchange-capability retaining substance, the flame retardant substance, and the microporous substance be 1 mm or less.
  • Examples of the cation-exchange capacity-retaining substance include zeolite powder not crushed, non-swellable to weakly swellable bentonite powder not crushed, acid clay powder and crushed, silica silicate powder not crushed and One or two or more of activated clay powder and crushed material, various types of landslides, tephra, tuff powder and crushed material can be used.
  • Examples of the flame retardant include rock powders such as aluminum hydroxide, magnesium hydroxide, quartzite, granite and andesite, powders containing the surface soil of these rocks, and mineral powders such as feldspar-quartz 'alunite' tourmaline. , Fly ash, bami kiuraito concentrate or fine to fine granules
  • microporous material examples include diatomaceous earth, diatomaceous earth fired particles and powder, minestone powder and crushed material, shirasu, shirasu balloon, perlite, sericite, brick powder, pottery powder, crystal ballite, One or more kinds of charcoal powder, activated carbon powder not yet, coat powder, sepiolite powder, and crushed material can be used.
  • the preferred mixing ratio is 50 to 100 parts by weight of sulfur and 20 to 50 parts by weight of powder containing calcium carbonate, and 5 to 20 parts by weight of mineral fiber as granular wool.
  • cation exchange capacity retention substance the case of adding a flame retarding material or micropores material, Shi desirable to add the total 10 to 30 wt% Rere 0
  • the denitrification material obtained in this way is suitable for water purification related to the removal of nitrate nitrogen, and the mineral fibers work effectively as a habitat for sulfur oxidizing bacteria, and the high denitrification ability is long-term. Is stably expressed over a period of time. Also, a large amount of sulfur-oxidizing bacteria can be carried, facilitating the early start of denitrification.
  • non-binder treated granular rock wool is used for mineral fibers, not only can a granular denitrification material be easily obtained, but also powder generation during crushing can be significantly suppressed.
  • the yield of products with a particle size of 2.5 mm or more can reach 90% or more.
  • the denitrification material of the present invention contains nutrients for sulfur oxidizing bacteria having an action of denitrifying nitrate nitrogen and is consumed when denitrification. It can also be referred to as a microbial activity imparting composition or a nitrate nitrogen denitrifying substrate.
  • nitrate nitrogen means nitrate ion and nitrite ion.
  • the denitrification material of the present invention there is no particular limitation on the shape of the denitrification material of the present invention, but the denitrification material itself is prevented from flowing out in order to increase the contact area with raw water and wastewater to be denitrified. Therefore, it is advantageous to have a certain size and a surface area as large as possible. Therefore, a shape such as a lump, a granule, and a molded product is preferably mentioned.
  • the molded product refers to a product having a certain shape such as a plate shape, a rod shape, and a honeycomb shape.
  • This denitrification material is suitable for water purification of nitrate nitrogen, is excellent in removing high concentration of nitrate nitrogen, and the pH of treated water does not become strongly acidic.
  • the denitrification water treated with the denitrification material of the present invention has a substantially improved neutrality and a high pH because the measured pH is almost neutral. Nitrogen can be reliably denitrified, which can greatly contribute to the improvement of the water environment.
  • the material for denitrification of the present invention can be used for treating wastewater containing nitrate nitrogen.
  • it is used for treatment of agricultural drainage such as factory drainage, city drainage, and farm culvert drainage.
  • the method of use includes a method of putting it in a basket or a net and immersing it in drainage, a method of filling it in a column, and a method of dispersing it in a tank.
  • the method is also advantageous. If the wastewater has a relatively low concentration such as agricultural wastewater, it can be used continuously for several years.
  • FIG. 1 is a graph showing a change in the concentration of nitrate nitrogen in raw water when the materials for denitrification (A) to (F) are used.
  • Fig. 2 is a graph showing the residual nitrate nitrogen in raw water when using the denitrification materials (H) and (I) prepared by changing the molding pressure in batch molding using a hydraulic press. It is.
  • Fig. 3 shows the results of using the denitrification materials (J) and (K) mixed with a carrier for denitrification bacteria and the denitrification material (A) in distilled water with potassium nitrate and phosphorus.
  • 4 is a graph showing the residual rate of nitrate nitrogen in synthetic raw water not containing denitrifying bacteria prepared by dissolving an acid salt.
  • G is an example in which no denitrification material is used.
  • Crystalline limestone powder (2900 cm 2 / g in Blaine value) was used as calcium carbonate, and this was mixed with powdered sulfur (200 mesh) using a high-speed impeller to form a dry compound. It was compression molded at a pressure of 650 KgZ cm 2 to obtain the denitrification materials (A) to (C) of the present invention.
  • the compounding and molding conditions of the prepared dry compound are as follows.
  • a denitrification test was performed using the above denitrification materials (A) to (F).
  • the denitrification materials (A) to (F) were immersed in raw water 5 times in weight ratio to perform a batch test, and a change in the total amount of nitrate ions and nitrite ions was traced.
  • a test (G) that does not use a denitrification material was also performed.
  • Figure 1 shows the results.
  • the nitrogen concentration in the raw water was almost zero in 14 days.
  • the pH after 14 days was 4.5 for (E) and 7.7 for (F).
  • a denitrification test was performed in the same manner as in Example 3 using the above denitrification materials (H) and (I).
  • Figure 2 shows the results.
  • the vertical axis in the figure indicates the residual rate (%) of nitrate nitrogen.
  • the nitrification material (I) having a low molding pressure had almost zero nitrate nitrogen by 10 days after the start of the experiment. It took about 2 weeks to remove nitrate nitrogen in raw water with high-denitrification material (H).
  • Example 5
  • (a) is a field soil (black soil of a leek field in Fukaya, Saitama prefecture).
  • the air-dried 60 mesh sieve is used as a carrier
  • (b) is a zeolite (Okutama Industries: Tamalite (trade name: TZ-0503) was used as a carrier, and these carriers were immersed in the raw water used in Example 3 for 3 days to carry the denitrifying bacteria, then air-dried and pulverized.
  • the mesh material was used as a carrier (a) or (b) for denitrifying bacteria.
  • a denitrification test was performed using the above denitrification materials (J) and (K). In addition, a denitrification test using the denitrification material (A) and a test (G) using no denitrification material were performed.
  • the raw water used in this experiment was distilled water containing 0.51 g ZL and nitric acid. 0.18 g / L of sodium hydrogen oxyhydrate was dissolved to prepare a liquid without denitrifying bacteria (ion nitrate concentration 300 mg ZL, phosphate ion concentration 50 mg / L). This was added so as to be 5 times the weight of the denitrification material, and a change in water quality was tracked as in Example 3.
  • Example 8 The same procedure as in Example 7 was repeated except that 25 parts by weight of calcium carbonate, 75 parts by weight of sulfur, 9 parts by weight of granular wool, 14 parts by weight of zeolite, and 10 parts by weight of aluminum hydroxide were used. A 20 mm denitrification material (N) was obtained.
  • Example 7 37.5 parts by weight of calcium carbonate, 75 parts by weight of sulfur, 9 parts by weight of granular rock wool and 14 parts by weight of zeolite were used in the same manner as in Example 7 for denitrification with a particle size of 5 to 20 mm.
  • the material (O) was obtained.
  • the denitrification material of the present invention which requires the mineral fiber as the essential component, is not limited to underdrainage from agricultural tracts where it is difficult to reduce fertilization; Also, it has excellent effect of removing nitrate nitrogen from wastewater that has been mineralized by primary treatment water of agricultural village wastewater and combined septic tank.
  • the denitrification material of the present invention containing a cation-exchange capacity-retaining substance, a flame retardant substance, a microporous substance, and the like can further enhance these effects and produce a substance during storage. It is possible to suppress the risk of combustion.
  • the denitrification material of the present invention can be made suitable for various types of wastewater by changing its manufacturing method and the type and amount of additives. For example, in the treatment of a plurality of wastewaters such as wastewater without and without denitrifying bacteria, wastewater with high and low nitrate nitrogen concentrations, wastewater with high acidity and low wastewater, the denitrification material of the present invention or By selecting the production method of the present invention, an excellent nitrate nitrogen removal effect can be obtained for any wastewater.
  • the material for denitrification for removing nitrate nitrogen by the microorganism of the present invention has an excellent nitrate nitrogen removal rate because calcium carbonate and sulfur coexist, and it is necessary to supply an essential nutrient source of the microorganism. Instead, the in-system balance before and after the reaction can be kept good, and it can be used directly as a substrate for culturing microorganisms.

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  • Biodiversity & Conservation Biology (AREA)
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  • Engineering & Computer Science (AREA)
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  • Water Supply & Treatment (AREA)
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  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

L'invention concerne une matière utilisée dans la dénitrification destinée à décomposer l'azote des nitrates dans des eaux usées par oxydation du soufre des bactéries faisant appel à du soufre et à un carbonate servant de nutriants. Cette matière renferme une composition ayant des particules de soufre et de carbonate de calcium dispersées ou un mélange uniforme de particules de carbonate de calcium et de particules de soufre. L'invention concerne également un procédé de préparation de la matière utilisée dans la dénitrification consistant à mélanger une poudre contenant un carbonate de calcium et ayant une valeur de Blaine allant de 2000 à 5000 cm2/g ainsi qu'une poudre renfermant du soufre et dont la granulométrie moyenne va de 0,01 à 2 mm dans un rapport de poids de 3 :1 à 1 :2 de manière à obtenir un mélange sous forme de poudre. Ce procédé consiste en outre à soumettre le mélange sous forme de poudre à une pression allant de 30 à 90 Mpa. L'invention concerne par ailleurs une matière utilisée dans la dénitrification, dont la poudre contenant le carbonate de calcium et le soufre et les fibres minérales forment un tout. Fig. 1 1 jours écoulés 2 azote de nitrate + azote sous forme de nitrite [mg-N/L]
PCT/JP2000/006777 1999-10-01 2000-09-29 Matiere utilisee dans la denitrification afin d'eliminer l'azote des nitrates et son procede de preparation WO2001025157A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP11/282077 1999-10-01
JP28207799A JP4269086B2 (ja) 1999-10-01 1999-10-01 硝酸性窒素脱窒素用組成物及びその製造方法
JP2000264564A JP4269087B2 (ja) 2000-08-31 2000-08-31 硝酸態窒素除去用活性化材の製造方法
JP2000/264564 2000-08-31

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105621609A (zh) * 2016-04-05 2016-06-01 中国地质大学（北京） 一种自养微生物反硝化法去除水中硝酸盐用材料
CN113121013A (zh) * 2021-04-16 2021-07-16 无锡映川环境技术有限公司 一种具有活性菌涂层的自养反硝化脱氮滤料及其制备方法
CN116143281A (zh) * 2022-12-27 2023-05-23 达斯玛环境科技（北京）有限公司 硫自养填料及其制备方法和应用
CN118598358A (zh) * 2024-08-06 2024-09-06 中建环能科技股份有限公司 一种污水脱氮载体及其制备方法和制备系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6129799B2 (fr) * 1983-04-15 1986-07-09 Susumu Hashimoto
JPH06495A (ja) * 1992-06-19 1994-01-11 Nippon Steel Chem Co Ltd 汚水浄化用濾材
JPH11285377A (ja) * 1998-04-02 1999-10-19 Hiroshi Masujima 微生物活性能付与組成物及びその製造方法
WO2000018694A1 (fr) * 1998-09-25 2000-04-06 Nitchitsu Co, Ltd. Composition de denitrification, destinee a l'enlevement de l'azote des nitrates, et procede de production associe

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6129799B2 (fr) * 1983-04-15 1986-07-09 Susumu Hashimoto
JPH06495A (ja) * 1992-06-19 1994-01-11 Nippon Steel Chem Co Ltd 汚水浄化用濾材
JPH11285377A (ja) * 1998-04-02 1999-10-19 Hiroshi Masujima 微生物活性能付与組成物及びその製造方法
WO2000018694A1 (fr) * 1998-09-25 2000-04-06 Nitchitsu Co, Ltd. Composition de denitrification, destinee a l'enlevement de l'azote des nitrates, et procede de production associe

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105621609A (zh) * 2016-04-05 2016-06-01 中国地质大学（北京） 一种自养微生物反硝化法去除水中硝酸盐用材料
CN113121013A (zh) * 2021-04-16 2021-07-16 无锡映川环境技术有限公司 一种具有活性菌涂层的自养反硝化脱氮滤料及其制备方法
CN116143281A (zh) * 2022-12-27 2023-05-23 达斯玛环境科技（北京）有限公司 硫自养填料及其制备方法和应用
CN118598358A (zh) * 2024-08-06 2024-09-06 中建环能科技股份有限公司 一种污水脱氮载体及其制备方法和制备系统

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