CN111137976A - Water treatment suspended filler capable of slowly releasing trace elements and preparation method thereof - Google Patents
Water treatment suspended filler capable of slowly releasing trace elements and preparation method thereof Download PDFInfo
- Publication number
- CN111137976A CN111137976A CN202010033588.6A CN202010033588A CN111137976A CN 111137976 A CN111137976 A CN 111137976A CN 202010033588 A CN202010033588 A CN 202010033588A CN 111137976 A CN111137976 A CN 111137976A
- Authority
- CN
- China
- Prior art keywords
- water treatment
- trace elements
- suspended filler
- parts
- slowly releasing
- 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.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
-
- 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
- C02F3/28—Anaerobic digestion processes
- C02F3/2806—Anaerobic processes using solid supports for microorganisms
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Microbiology (AREA)
- Organic Chemistry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention discloses a water treatment suspended filler capable of slowly releasing trace elements, which belongs to the field of water treatment, and adopts the technical scheme that the water treatment suspended filler comprises the following components in parts by weight: 60-90 parts of high-density polyethylene; degradable plastics, rubber, maleic anhydride grafted polyethylene and activated carbon powder; single or compound trace elements and specific gravity regulating material. The preparation method comprises the following operation steps: s1, stirring and mixing degradable plastics, ethylene propylene diene monomer, maleic anhydride grafted polyethylene and oxide or salt of trace elements, drying and granulating to obtain particles; s2, mixing the particles obtained in the step S1 with high-density polyethylene, activated carbon powder and a specific gravity adjusting material to obtain a mixed material; and S3, melting the mixed materials, extruding, molding and cutting into required lengths. The water treatment suspended filler capable of slowly releasing the trace elements provided by the invention has industrial value when being independently applied to water treatment or being combined with other fillers according to different proportions to be applied to water treatment.
Description
Technical Field
The invention relates to the field of water treatment, in particular to a water treatment suspended filler capable of slowly releasing trace elements.
Background
Sustained release technology is the process of maintaining the release rate of a particular substance in a particular system by some means, thereby ensuring that the substance is maintained within a stable concentration range for a certain period of time. In the field of water treatment, a sustained-release water treatment agent is commonly used, and is prepared by preparing a homogeneous carrier by binding certain special active substances and a mediator, wherein when the carrier is corroded in water, the active substances are released to play the role of the carrier, but after the special substances are completely released, the structure of a filler can be disintegrated to form fragments, so that the subsequent process equipment is damaged.
Disclosure of Invention
The invention aims to provide a water treatment suspended filler capable of slowly releasing trace elements, which can release the trace elements and has higher practical value in sewage treatment.
The technical purpose of the invention is realized by the following technical scheme:
the water treatment suspended filler capable of slowly releasing the trace elements comprises the following components in parts by weight: 60-90 parts of high-density polyethylene; 5-30 parts of degradable plastics; 1-20 parts of rubber; 5-10 parts of maleic anhydride grafted polyethylene; 1-10 parts of activated carbon powder; 5-20 parts of single or compound trace elements; 1-20 parts of specific gravity adjusting material.
Further, the degradable plastic is polylactic acid or polyhydroxy fatty acid or a mixture of the polylactic acid and the polyhydroxy fatty acid in any proportion.
Further, polylactic acid is prepared from starch extracted from renewable plant resources as a raw material.
Further, polylactic acid is prepared from starch extracted from corn, sweet potato or potato as raw material.
Further, the particle size of the polylactic acid is 0.5-2mm
Further, the polyhydroxyalkanoate is a bioplastic synthesized by microorganisms.
Further, the polyhydroxyfatty acid is preferably poly- β -hydroxybutyric acid (PHB).
Further, the high density polyethylene has a density of 0.95 to 0.96g/cm3The grain diameter is 0.1-4 mm.
Furthermore, the trace elements are any one or a mixture of more of Fe, Zn, Co, Mg, Mn, Cn, Ca, Mo, K or rare earth elements. Many trace elements have obvious function of promoting the growth or activity of microorganisms at proper concentration, and the trace elements can promote the growth of the microorganisms by being used as a biological enzyme synthesis component, a coenzyme factor or participating in electron transfer and other ways. These trace elements include: fe. Zn, Co, Mg, Mn, Cn, Ca, Mo, K and partial rare earth elements. For example, Fe is the most abundant transition metal element in biological systems, and it is usually combined with protein coenzyme factors to participate in the catalysis, oxidation-reduction or electron transfer process of microorganisms. It has been found that anammox bacteria are highly dependent on some iron-containing proteins, especially cytochromes, for energy conversion. Fe may become a deficient element during the start-up of the anammox reactor. Anaerobic ammonium-oxidizing bacteria contain a plurality of iron storage 'sites', and the stored iron element is usually Fe2+The form of (A) is taken as a coenzyme factor of Fe-S protein and heme protein to participate in the electron transfer process of anammox bacteria and comprises NH4 +-N to N2And can promote metabolism of anammox bacteria.
Further, the donor of the trace element is an oxide or an inorganic salt of the trace element.
Furthermore, the rubber is preferably ethylene propylene diene monomer, the particle size of the ethylene propylene diene monomer is 0.5-2nm, the surface tension and the tensile resistance of the material can be improved by adding the ethylene propylene diene monomer into the blend of the degradable plastic and the high-density polyethylene, and meanwhile, the whole filler can not be disintegrated after the degradable plastic is completely degraded, and can be continuously used as a common filler, so that the damage of subsequent process equipment is avoided.
Furthermore, the particle size of the maleic anhydride grafted polyethylene is 0.5-5nm, the content of the effective substance is 80% -90%, and the compatibility of the high-density polyethylene and the degradable plastic can be improved by adding the maleic anhydride grafted polyethylene due to the large structural difference between the high-density polyethylene and the degradable plastic; and the crystallinity and crystallinity of the high-density polyethylene and the degradable plastic are different, and in a molten state, the addition of the maleic anhydride grafted polyethylene can ensure that the high-density polyethylene and the degradable plastic have higher fusion degree in the molten state, the extrusion molding is easier, and the high-density polyethylene and the degradable plastic are not easy to separate after cooling.
Furthermore, the particle size of the activated carbon powder is 400-600 meshes, and the purity is 99.9%. The activated carbon powder can increase the specific surface area and the hydrophilicity of the filler and can ensure that the filler is suspended in water.
Further, the specific gravity adjusting material is calcium carbonate or talcum powder.
Further, the preparation method of the water treatment suspended filler capable of slowly releasing the trace elements comprises the following operation steps:
s1, stirring and mixing degradable plastics, ethylene propylene diene monomer, maleic anhydride grafted polyethylene and oxide or salt of trace elements, drying and granulating to obtain particles;
s2, mixing the particles obtained in the step S1 with high-density polyethylene, activated carbon powder and a specific gravity adjusting material to form a mixed material;
and S3, melting the mixed materials, extruding, molding and cutting into required lengths.
Further, the mixing in S2 is high-speed stirring mixing, and the rotation speed of the stirrer is 100-500 rpm.
Furthermore, the temperature of different parts of the mixing material melting barrel in the S3 is different, the mode of 'two ends are low, the middle is high' is adopted, and the whole temperature interval is 150-190 ℃.
Further, in S3, immediately after the hot extrusion molding, the cooling is rapidly performed in the form of water cooling.
Furthermore, the application method of the water treatment suspended filler capable of slowly releasing the trace elements is characterized in that the water treatment suspended filler capable of slowly releasing the trace elements is independently applied to water treatment or is combined with other fillers according to different proportions and applied to water treatment.
In conclusion, the invention has the following beneficial effects:
(1) the trace elements can be synchronously released from the filler along with the degradation of the degradable plastic, so that the slow release effect is achieved, and the slow release concentration of the trace elements can be controlled by different polylactic acid proportions.
(2) After all the trace elements are released, the structure of the filler can not be disintegrated to form fragments, so that the damage of subsequent process equipment can not be caused.
(3) Organic matters generated in the hydrolysis process of the degradable plastics (PLA or PHA) can be used as nutrient substances to be beneficial to biofilm formation and growth of microorganisms; also provides carbon source for the microorganism in the denitrification process, and plays a dual role.
Detailed Description
Example 1: a water treatment suspended filler capable of slowly releasing ferrous iron to promote activity of anaerobic ammonium oxidation bacteria comprises the following materials in parts by weight: 80 parts of high-density polyethylene; 15 parts of polylactic acid; 10 parts of ethylene propylene diene monomer; 8 parts of maleic anhydride grafted polyethylene; 8 parts of activated carbon powder; 6 parts of ferrous chloride; adding specific gravity regulating material to make the specific gravity of the filler be 0.98-0.99g/cm3The filler is suitable for anaerobic or anoxic working conditions, and the existence of ferrous salt can promote the biofilm formation and activity of microorganisms such as anaerobic ammonium oxidation bacteria and the like.
The preparation process comprises the following steps: s1, stirring and mixing polylactic acid, ethylene propylene diene monomer, maleic anhydride grafted polyethylene and ferrous chloride, drying at 105 ℃ to constant weight, and granulating to obtain granules;
s2, mixing the particles, high-density polyethylene, activated carbon powder and a specific gravity adjusting material into a mixed material by using a high-speed mixer at 300 rpm;
s3, guiding the mixed materials into a screw plastic extruding machine, wherein the plastic extruding machine is provided with five heating devices to control the temperature of a charging barrel, and the temperature combination is more suitable for processing the raw materials of the formula: 160 ℃, 175 ℃, 180 ℃, 175 ℃, and 170 ℃, water-cooled immediately after extrusion molding, and cut into desired lengths.
The resulting filler was tested as specified in "high density polyethylene suspension support fillers for water treatment" (CJ/T461-2014) with the following test results:
table 1 example 1 filler performance test results
From the test results of example 1, it can be seen that: the addition of the ethylene propylene diene monomer improves the surface tension and the tensile resistance of the filler, ensures that the whole filler cannot be disintegrated after the degradable plastic is completely degraded, can be continuously used as a common filler, and avoids the damage of subsequent process equipment; the addition of the maleic anhydride grafted polyethylene can ensure that the fusion degree of the maleic anhydride grafted polyethylene and the polyethylene is higher in a molten state, the extrusion molding is easier, the maleic anhydride grafted polyethylene and the polyethylene are not easy to separate after being cooled, and the compression strength and the compression resilience rate of the filler meet corresponding standards.
Aiming at the problems that the growth rate of anammox bacteria is slow, the multiplication time is long (usually 11-15 days), the starting time of the process is long, the practical application of the process is influenced and the like, the activated sludge in UASB is adopted, and the filler described in the embodiment 1 is added for film formation. The shaking culture is carried out in a constant temperature shaking table at 150rpm and 30 +/-2 ℃ by adopting a completely closed anaerobic culture mode. The experimental run had a single cycle of 2 days with a 50mL exchange volume per cycle, i.e. a 50% exchange ratio. The test was divided into two groups, group a being the conventional MBBR packing group and group B being the example 1 packing group.
The results show that the average total nitrogen removal rate of group B is 10.33% higher than that of group A; the activity of the anaerobic ammonium oxidation bacteria in the group B is improved most obviously, and the improvement degree of the activity of the anaerobic ammonium oxidation bacteria in the group B is obviously different from that of the group A (p is less than 0.05) and is 53.21% higher than that of the group A on the 30 th day.
Example 2: a water treatment suspended filler capable of slowly releasing zinc to promote printing and dyeing wastewater treatment effect comprises the following materials in parts by weight: 70 parts of high-density polyethylene; 10 parts of polylactic acid; 5 parts of ethylene propylene diene monomer; 5 parts of maleic anhydride grafted polyethylene; 3 parts of activated carbon powder; 15 parts of zinc sulfate; adding specific gravity regulating material to make the specific gravity of the filler be 0.95-0.96g/cm3The filler is suitable for aerobic working conditions, and the COD removal rate of the printing and dyeing wastewater can be improved due to the existence of zinc.
The preparation process comprises the following steps: s1, stirring and mixing polylactic acid, ethylene propylene diene monomer, maleic anhydride grafted polyethylene and zinc sulfate, drying at 105 ℃ to constant weight, and granulating to obtain granules;
s2, mixing the particles, high-density polyethylene, activated carbon powder and a specific gravity adjusting material into a mixed material by using a high-speed mixer at 300 rpm;
s3, guiding the mixed materials into a screw plastic extruding machine, wherein the plastic extruding machine is provided with five heating devices to control the temperature of a charging barrel, and the temperature combination is more suitable for processing the raw materials of the formula: 150 ℃, 165 ℃, 175 ℃, 170 ℃ and 160 ℃, water-cooled immediately after extrusion molding, and cut to the desired length.
The resulting filler was tested as specified in "high density polyethylene suspension support fillers for water treatment" (CJ/T461-2014) with the following test results:
table 2 example 2 filler performance test results
| Example 2 Filler | Standard requirements | |
| Density of | 0.956g/cm3 | 0.94-0.97 |
| Hydrophilic contact angle | 73° | Is free of |
| Specific surface area | 620m2/m3 | 620m2/m3 |
| Compressive strength | 0.23N/mm | 0.14-0.32 |
| Rebound rate of compression | 94％ | 75～96 |
| Degradable years | 5.76 years old | Is free of |
From the test results of example 2, it can be seen that: the addition of the ethylene propylene diene monomer improves the surface tension and the tensile resistance of the filler, ensures that the whole filler cannot be disintegrated after the degradable plastic is completely degraded, can be continuously used as a common filler, and avoids the damage of subsequent process equipment; the addition of the maleic anhydride grafted polyethylene can ensure that the fusion degree of the maleic anhydride grafted polyethylene and the polyethylene is higher in a molten state, the extrusion molding is easier, the maleic anhydride grafted polyethylene and the polyethylene are not easy to separate after being cooled, and the compression strength and the compression resilience rate of the filler meet corresponding standards.
Simulating the operation conditions of an aerobic tank of a certain printing and dyeing wastewater treatment plant, wherein HRT is 22 hours, and DO is 2-3 mg/L. The test was divided into two groups, group a being the conventional MBBR packing group and group B being the example 2 packing group.
The results show that the growth rate of the biomembrane of the group B is 1.3 times that of the group A, the COD removal rate after the reactor of the group B is stabilized is 12 percent higher than that of the group A, and the ammonia nitrogen removal rate is 15 percent higher than that of the group A.
The zinc content on the biomembrane meets the requirement that the zinc emission amount specified in sludge quality of urban sewage treatment plants (GB 24188-2009) is less than 4mg/g of dry sludge, and the concentration of zinc in effluent meets the requirement that the zinc emission limit value specified in pollutant emission standards of urban sewage treatment plants (GB18918-2002) is 0.1 mg/L.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. The water treatment suspended filler capable of slowly releasing the trace elements is characterized by comprising the following components in parts by weight: 60-90 parts of high-density polyethylene; 5-30 parts of degradable plastics; 1-20 parts of rubber; 5-10 parts of maleic anhydride grafted polyethylene; 1-10 parts of activated carbon powder; 5-20 parts of single or compound trace elements; 1-20 parts of specific gravity adjusting material.
2. The water-treatment suspended filler slowly releasing trace elements as claimed in claim 1, wherein the degradable plastic is polylactic acid or polyhydroxy fatty acid or a mixture of polylactic acid and polyhydroxy fatty acid in any proportion.
3. The slow release trace element-containing water treatment suspended filler according to claim 2, wherein the polylactic acid is prepared from starch extracted from renewable plant resources as a raw material.
4. The slow release trace element water treatment suspended filler according to claim 2, wherein the polyhydroxyalkanoate is a bio-plastic synthesized by microorganisms.
5. The slow release trace element-containing water treatment suspended filler according to claim 1, wherein the high density polyethylene has a density of 0.95 to 0.96g/cm3The grain diameter is 0.1-4 mm.
6. The slow-release water treatment suspended filler containing trace elements as claimed in claim 1, wherein the trace elements are any one or a mixture of more of Fe, Zn, Co, Mg, Mn, Cn, Ca, Mo, K or rare earth elements.
7. The slow release trace element-containing water treatment suspended filler according to claim 6, wherein the trace element donor is an oxide or an inorganic salt of a trace element.
8. The slow release trace element-containing water treatment suspended filler according to claim 1, wherein the specific gravity adjusting material is calcium carbonate or talc.
9. A preparation method of a water treatment suspended filler capable of slowly releasing trace elements is characterized by comprising the following operation steps:
s1, stirring and mixing degradable plastics, rubber, maleic anhydride grafted polyethylene and oxides or salts of trace elements, drying and granulating to obtain particles;
s2, mixing the particles obtained in the step S1 with high-density polyethylene, activated carbon powder and a specific gravity adjusting material to form a mixed material;
and S3, melting the mixed materials, extruding, molding and cutting into required lengths.
10. An application method of a water treatment suspended filler capable of slowly releasing trace elements is characterized in that the water treatment suspended filler capable of slowly releasing trace elements is independently applied to water treatment or is combined with other fillers according to different proportions to be applied to water treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010033588.6A CN111137976A (en) | 2020-01-13 | 2020-01-13 | Water treatment suspended filler capable of slowly releasing trace elements and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010033588.6A CN111137976A (en) | 2020-01-13 | 2020-01-13 | Water treatment suspended filler capable of slowly releasing trace elements and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111137976A true CN111137976A (en) | 2020-05-12 |
Family
ID=70524732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010033588.6A Pending CN111137976A (en) | 2020-01-13 | 2020-01-13 | Water treatment suspended filler capable of slowly releasing trace elements and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111137976A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112390361A (en) * | 2020-10-16 | 2021-02-23 | 北京工业大学 | Hydroxylamine and ferrous ion reinforced domestic sewage PNA integrated SBBR deep denitrification method |
| CN114747518A (en) * | 2022-03-25 | 2022-07-15 | 深圳市太丰东方海洋生物科技有限公司 | Chlamys nobilis breeding method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU3634300A (en) * | 1999-05-27 | 2000-11-30 | Pku Pulverkautschuk Union Gmbh | Rubber powders which contain large amounts of fillers, a process for preparing them and their use |
| KR20040084362A (en) * | 2003-03-28 | 2004-10-06 | 학교법인 고운학원 | Contact media for water treatment using mixed plastic and paper sludge and manufacturing method thereof |
| CN106630114A (en) * | 2016-11-19 | 2017-05-10 | 合肥创新轻质材料有限公司 | Porous polymer filling material for biotrickling filter |
| CN109019843A (en) * | 2018-08-14 | 2018-12-18 | 江苏裕隆环保有限公司 | A kind of floating stuffing and preparation method thereof for biological wastewater treatment |
| CN109160619A (en) * | 2018-11-02 | 2019-01-08 | 江苏中车环保设备有限公司 | A kind of application method having both filler with slow release carbon source suitable for rural sewage treatment |
| CN109231431A (en) * | 2018-09-13 | 2019-01-18 | 同济大学 | A kind of method of urban water-body original position microorganism remediation |
| CN110642372A (en) * | 2019-09-29 | 2020-01-03 | 北交源生态环境科技(北京)有限公司 | Intermittent aeration method for MBBR aeration |
-
2020
- 2020-01-13 CN CN202010033588.6A patent/CN111137976A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU3634300A (en) * | 1999-05-27 | 2000-11-30 | Pku Pulverkautschuk Union Gmbh | Rubber powders which contain large amounts of fillers, a process for preparing them and their use |
| KR20040084362A (en) * | 2003-03-28 | 2004-10-06 | 학교법인 고운학원 | Contact media for water treatment using mixed plastic and paper sludge and manufacturing method thereof |
| CN106630114A (en) * | 2016-11-19 | 2017-05-10 | 合肥创新轻质材料有限公司 | Porous polymer filling material for biotrickling filter |
| CN109019843A (en) * | 2018-08-14 | 2018-12-18 | 江苏裕隆环保有限公司 | A kind of floating stuffing and preparation method thereof for biological wastewater treatment |
| CN109231431A (en) * | 2018-09-13 | 2019-01-18 | 同济大学 | A kind of method of urban water-body original position microorganism remediation |
| CN109160619A (en) * | 2018-11-02 | 2019-01-08 | 江苏中车环保设备有限公司 | A kind of application method having both filler with slow release carbon source suitable for rural sewage treatment |
| CN110642372A (en) * | 2019-09-29 | 2020-01-03 | 北交源生态环境科技(北京)有限公司 | Intermittent aeration method for MBBR aeration |
Non-Patent Citations (1)
| Title |
|---|
| 邸俊强: "改性移动床生物反应器载体制备与性能评价", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅰ辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112390361A (en) * | 2020-10-16 | 2021-02-23 | 北京工业大学 | Hydroxylamine and ferrous ion reinforced domestic sewage PNA integrated SBBR deep denitrification method |
| CN114747518A (en) * | 2022-03-25 | 2022-07-15 | 深圳市太丰东方海洋生物科技有限公司 | Chlamys nobilis breeding method |
| CN114747518B (en) * | 2022-03-25 | 2023-11-17 | 深圳市太丰东方海洋生物科技有限公司 | Breeding method of Chlamys nobilis |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP3369713B1 (en) | Nitrogen removal method | |
| CN101693775B (en) | Fixed microbe rubber granule filler, preparation and application thereof | |
| CN106976985B (en) | A kind of Tiny ecosystem floating bed and its application method for water body purification of aquaculture | |
| CN111137976A (en) | Water treatment suspended filler capable of slowly releasing trace elements and preparation method thereof | |
| LU101521B1 (en) | Suspended filler for biologically treating wastewater and a method for preparing the same | |
| CN1206173C (en) | Active microorganism carrier for use in biological treatment | |
| CN109607764B (en) | Pre-film fluidized bed filler and preparation method and application thereof | |
| WO2000018694A1 (en) | Denitrifying composition for removing nitrate nitrogen and process for producing the same | |
| CN110803766B (en) | Synchronous nitrification and denitrification process combining nitrification functional type and denitrification functional type suspension carrier | |
| CN112358043A (en) | Efficient deep denitrification filler for water treatment | |
| CN105712488A (en) | Biological bottom modifying agent special for fresh water and preparation method thereof | |
| CN110980934A (en) | Suspended filler and preparation method thereof | |
| CN112552664B (en) | Polylactic acid and lactide blended slow-release material | |
| KR100823318B1 (en) | Denitrification process and producing method of the pellet for sulfur oxidation denitrification of nitrate and nitrite | |
| CN115818841A (en) | Preparation method and application of composite carbon source | |
| CN103693757B (en) | A kind of conventional nutrient medium carrier for wastewater treatment and preparation method thereof | |
| CN105502650B (en) | A kind of preparation method of aquiculture waste water advanced nitrogen complex solid carbon source filler | |
| WO2019148503A1 (en) | Electron donor-type biological carrier and preparation method therefor | |
| WO2014141406A1 (en) | Method for producing seeding agent | |
| JP2009023890A (en) | Method and apparatus for producing liquid fertilizer | |
| CN109261086B (en) | Active microcapsule and preparation method and application thereof | |
| CN106745727A (en) | A kind of denitrogenation method of acrylic fiber production process process discharge ammonia-containing water | |
| CN112746052B (en) | Culture method for improving resistance of nitrobacteria | |
| CN111362404A (en) | Solid carbon source suitable for high-concentration nitrate nitrogen sewage treatment and preparation method thereof | |
| CN101468852A (en) | Method for aerobic synchronous nitration and denitrification of coking wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200512 |