CN113023819A - Composite material covering piece for inhibiting nitrogen and phosphorus release of landscape lake sediment - Google Patents
Composite material covering piece for inhibiting nitrogen and phosphorus release of landscape lake sediment Download PDFInfo
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- CN113023819A CN113023819A CN202110278752.4A CN202110278752A CN113023819A CN 113023819 A CN113023819 A CN 113023819A CN 202110278752 A CN202110278752 A CN 202110278752A CN 113023819 A CN113023819 A CN 113023819A
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- geotextile
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- sediment
- nitrogen
- water
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 239000013049 sediment Substances 0.000 title claims abstract description 29
- 239000002131 composite material Substances 0.000 title claims abstract description 23
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 19
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 19
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 239000011574 phosphorus Substances 0.000 title claims abstract description 15
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000004746 geotextile Substances 0.000 claims abstract description 19
- 239000010802 sludge Substances 0.000 claims abstract description 19
- 238000005189 flocculation Methods 0.000 claims abstract description 13
- 230000016615 flocculation Effects 0.000 claims abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 13
- 238000000746 purification Methods 0.000 claims abstract description 7
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 6
- 239000000440 bentonite Substances 0.000 claims abstract description 6
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 6
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000004568 cement Substances 0.000 claims abstract description 6
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims abstract description 6
- 239000010457 zeolite Substances 0.000 claims abstract description 6
- 238000000034 method Methods 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 9
- 238000001354 calcination Methods 0.000 claims description 6
- 238000007605 air drying Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- JYIBXUUINYLWLR-UHFFFAOYSA-N aluminum;calcium;potassium;silicon;sodium;trihydrate Chemical compound O.O.O.[Na].[Al].[Si].[K].[Ca] JYIBXUUINYLWLR-UHFFFAOYSA-N 0.000 claims description 2
- 229910001603 clinoptilolite Inorganic materials 0.000 claims description 2
- 229910052681 coesite Inorganic materials 0.000 claims description 2
- 229910052906 cristobalite Inorganic materials 0.000 claims description 2
- 239000008187 granular material Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052682 stishovite Inorganic materials 0.000 claims description 2
- 229910052905 tridymite Inorganic materials 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 5
- 150000003839 salts Chemical class 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 235000015097 nutrients Nutrition 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 abstract 1
- 238000009958 sewing Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 8
- 238000012851 eutrophication Methods 0.000 description 5
- 238000011065 in-situ storage Methods 0.000 description 5
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000001179 sorption measurement Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 238000005067 remediation Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005273 aeration Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000000050 nutritive effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 239000003403 water pollutant Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011246 composite particle Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
Images
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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/128—Coherent linings made on the spot, e.g. cast in situ, extruded on the spot
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to the technical field of environmental protection, and aims to solve the environmental problem of nitrogen and phosphorus pollution of landscape lake sediment, in particular to a composite covering piece for inhibiting the release of nitrogen and phosphorus of landscape lake sediment, wherein the composite covering piece is made of the sediment, is matched with modified flocculation tank sludge of a water purification plant, zeolite powder, bentonite and cement after being modified and calcined, is granulated, is bottomed by geotextile, is covered by another geotextile, and is divided into a plurality of small square grids of 20cm by sewing the edge and the inside of the geotextile, and the total thickness is about 24-25 mm. The composite material particles have good crystallinity and rich micropore and mesoporous pore channel structures, and have obvious effects on controlling the release of nitrogen and phosphorus in bottom sediment and reducing nutrient salts in overlying water.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a composite covering piece for inhibiting nitrogen and phosphorus release of landscape lake sediment.
Background
In recent years, under the background of rapid development of economy, rapid increase of population and slight environmental awareness of people in China, national problems of lake eutrophication, lake ecological damage, water quality deterioration and the like are caused, so that obstacles appear in a plurality of lake ecological systems in China, and a severe test is brought to the regional economic and social sustainable development of China.
Most of the landscape lakes are artificial lakes, overflowed water is directly connected to a municipal drainage pipe network, long-term stable water replenishing is lacked, water in the landscape lakes is difficult to keep good fluidity, and nutrient salts such as N, P are accumulated. When the input amount of the external N, P nutritive salt is reduced, only the release of the original pollutants can still make the water body in a eutrophication state, so that the control of the release of N, P and other pollutants in the bottom mud to the overlying water is necessary for preventing and controlling the environmental pollution of surface water. How to relieve eutrophication damage caused by the release of nitrogen and phosphorus in the sediment on the basis of not damaging the ecology of the lake water body is a technical problem in the field.
At present, common in-situ sediment pollution control technologies at home and abroad mainly comprise a sediment dredging engineering technology, a deep aeration technology, a chemical remediation technology, a biological remediation technology and the like. However, sediment dredging can significantly disturb the sediment structure and can even result in the release of contaminants from the sediment that can cause secondary pollution to the overlying water body. In addition, the dredged silt occupies a large land area, which causes waste of land resources and high disposal cost of the silt. It has been shown that deep aeration techniques are not always effective in controlling the release of nutritive salts from the sediment. At present, great controversy exists for the chemical remediation technology to control the bottom sediment pollution.
Disclosure of Invention
Aiming at the condition of lack of scientific treatment of the bottom sludge in the prior art, the invention provides the bottom sludge modified composite material with the optimal proportion by an in-situ covering mode, and solves the problem of lake eutrophication caused by the release of nitrogen and phosphorus in the bottom sludge of landscape lakes.
A composite covering piece for inhibiting nitrogen and phosphorus release of landscape lake sediment is prepared by the following method:
1) preparing modified bottom mud by using a composite material: modified flocculation tank sludge of water purification plant: zeolite powder: preparing materials according to the mass ratio of bentonite =1:2:3:1, adding 10-20 wt% of cement as a binding agent, uniformly mixing, and granulating;
2) flatly paving the particles obtained in the step 1) on one layer of geotextile, and covering the geotextile with the other layer of geotextile, wherein the thickness is 24-25 mm.
The preparation method of the modified bottom mud comprises the following steps: taking the bottom mud out of the landscape lake, air-drying, grinding and crushing, and sieving with a 100-mesh sieve; calcining at 550 ℃ for 3h to prepare the bottom mud modified material.
The preparation method of the modified flocculation tank sludge of the water treatment plant comprises the following steps: the method comprises the following steps of (1) air-drying flocculation tank sludge taken out of a water purification plant, grinding and crushing, and sieving with a 100-mesh sieve; calcining the mixture for 3 hours at the temperature of 400 ℃ to prepare the flocculation tank sludge modified material of the water purification plant.
Wherein the zeolite powder is natural clinoptilolite, the particle size is less than 0.15mm, and the specific surface area is 500-800 m2G, density 23 g/cm3，SiO2The content is 65%; the purity of the bentonite is AR; the geotextile uses 300g of national standard geotextile, and the thickness of the geotextile is 2-2.5 mm.
Wherein the grain diameter of the granules is 10-40 mm.
Furthermore, the edges and the inside of the geotextile of the covering piece are sewn to form a plurality of square grids with the side length of 20 cm.
The invention adopts an in-situ covering method, namely in-situ covering, which utilizes a material with good barrier and adsorption effects to cover polluted bottom mud, and controls the release of pollutants in the bottom mud to an overlying water body. Compared with the dredging technology, the in-situ covering technology can reduce the resuspension phenomenon of the sediment, does not need to dispose the dredged sediment, reduces the processing cost and reduces the potential risk to the environment.
Furthermore, by exploring a nitrogen and phosphorus release mechanism of the sediment, the adsorption performance of the sediment is regulated and improved by calcination modification, and the sediment is compounded with the flocculation tank sludge, the bentonite and the zeolite powder to prepare a modified sediment composite material as a covering material, the inhibition effect on the N, P nutrient salt concentration in the overlying water body is obviously improved after the thickness of the covering layer is increased, metal ions such as Fe and Al in the material can fix the P in the overlying water and the sediment, and the water body eutrophication phenomenon caused by overhigh P concentration in the water body is effectively inhibited. Can effectively and safely adsorb and inhibit nitrogen and phosphorus in the bottom sediment, improve the structure of the bottom sediment and recover the continuous self-cleaning capability of the bottom sediment on overlying water and endogenous pollution.
The invention has the beneficial effects
1. The method has simple process and low cost, provides a new way for recycling the landscape lake sediment and the flocculation tank sludge of the water treatment plant, and really realizes changing waste into valuable;
2. the method adopts a calcination method, so that the potential risk of releasing ammonia nitrogen and organic pollutants to a water body by the sludge of the flocculation tank of the water treatment plant is avoided;
3. according to the method, 10-20% of cement is added as a binder, the cement dosage is reasonably controlled, and the influence of the cement on the adsorption performance of the composite material after curing is avoided;
4. the sludge particles have the particle size of about 20mm, and the particle covering layer with the size has moderate hydraulic conductivity coefficient and good adsorption effect on nitrogen and phosphorus;
5. the covering thickness of the composite material covering piece prepared by the method is about 24-25mm in use, belongs to thin layer covering, and has little influence on the volume of a landscape lake, the stored water quantity and flood discharge;
6. the geotextile used by the composite covering element has excellent filtering, draining, isolating and protecting effects, has the characteristics of light weight, high tensile strength, good permeability, aging resistance and corrosion resistance, effectively isolates the composite from bottom mud and overlying water, achieves the aim of adsorbing pollutants and avoids secondary pollution;
7. the covering part is in a square lattice shape, and composite material particles are uniformly divided into a plurality of square lattice spaces, so that the covering part is fully utilized and is adsorbed uniformly.
Drawings
FIG. 1 is a schematic view of the application of the composite cover of the present invention;
FIG. 2 is a plan view of a composite overlay of the present invention;
FIG. 3 is a cross-sectional view of a composite overlay of the present invention;
FIG. 4 is a schematic diagram of an in-house test of composite particles of example 1;
wherein 2, geotextile, 3, bottom mud modified composite material particles, 4, bottom mud, 5 and covering water.
Detailed Description
The technical effects of the present invention are described in the following by way of illustration of specific embodiments with reference to the attached drawings, which are convenient for those skilled in the art to understand and do not limit the protection scope of the present invention. Conventional technical alternatives are made by common general knowledge in the field and still fall within the scope of the present invention.
According to the steps and technical points of the present invention, the following examples were conducted in an indoor experimental study using lake water and lake bottom sludge of a landscape lake in denna as study objects.
Example 1
Taking a certain landscape lake in Jinan City as an example, sampling, detecting and analyzing the water and the lake bottom of the landscape lake, and implementing the method by using the composite material particles for inhibiting the release of nitrogen and phosphorus in the sludge at the landscape lake bottom as the method for controlling the endogenous pollution.
As shown in FIG. 4, an organic glass vessel having an inner diameter of 12cm, a height of 40cm and a capacity of 4500mL was used as a test apparatus, 1000mL of bottom mud was added to the vessel at a mud-water volume ratio of 1:3, and lake water was used as the upper water, which was slowly poured along the vessel wall by a soft rubber tube using the siphon principle, and the volume of the upper water was 3000 mL. Collecting 30mL of overlying water sample every day, collecting for 15d, and adding equal volume of deionized water after collecting the water sample to keep the total volume of the overlying water constant.
Two identical sets of devices, numbered #1 and #2, respectively, are provided in this manner. And (3) adding no covering layer in the device #1, adding a layer of composite material particle covering layer in the device # 2, carrying out a bottom sediment nitrogen and phosphorus release inhibition experiment for 15 days, and calculating according to a formula (1).
C1: concentration of water pollutants on uncovered bottom mud;
C2: adding the covering layer bottom mud and the covering water pollutant concentration.
Measured on day 15, the #1 device was covered with TN and NH in water4 +The concentration of-N, TP is 10.985, 1.527 and 0.118mg/L, TN and NH are covered in water on a #2 device4 +The concentration of-N, TP was 4.22, 0.317, 0.035mg/L, and the coverage inhibition was 61.58, 79.24, 70.34%, respectively.
Claims (6)
1. The composite covering piece for inhibiting nitrogen and phosphorus release of the landscape lake sediment is characterized by being prepared by the following method:
1) preparing modified bottom mud by using a composite material: modified flocculation tank sludge of water purification plant: zeolite powder: preparing materials according to the mass ratio of bentonite =1:2:3:1, adding 10-20 wt% of cement as a binding agent, uniformly mixing, and granulating;
2) flatly paving the particles obtained in the step 1) on one layer of geotextile, and covering the geotextile with the other layer of geotextile, wherein the thickness is 24-25 mm.
2. The preparation method according to claim 1, wherein the modified bottom mud is prepared by the following steps: taking the bottom mud out of the landscape lake, air-drying, grinding and crushing, and sieving with a 100-mesh sieve; calcining at 550 ℃ for 3h to prepare the bottom mud modified material.
3. The method for preparing the flocculation basin sludge of the modified water treatment plant according to claim 1, wherein the method for preparing the flocculation basin sludge of the modified water treatment plant comprises the following steps: the method comprises the following steps of (1) air-drying flocculation tank sludge taken out of a water purification plant, grinding and crushing, and sieving with a 100-mesh sieve; calcining the mixture for 3 hours at the temperature of 400 ℃ to prepare the flocculation tank sludge modified material of the water purification plant.
4. The preparation method according to claim 1, wherein the zeolite powder is natural clinoptilolite, the particle size is less than 0.15mm, and the specific surface area is 500-800 m2(ii)/g, density 23 g/cm3, SiO2The content is 65%; the purity of the bentonite is AR; the geotextile uses 300g of national standard geotextile, and the thickness of the geotextile is 2-2.5 mm.
5. The process according to claim 1, wherein the granulated material has a particle size of 10 to 40 mm.
6. The method of claim 1, wherein the geotextile edges and the inside of the cover are sewn to form a plurality of square cells having a side length of 20 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110278752.4A CN113023819A (en) | 2021-03-16 | 2021-03-16 | Composite material covering piece for inhibiting nitrogen and phosphorus release of landscape lake sediment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110278752.4A CN113023819A (en) | 2021-03-16 | 2021-03-16 | Composite material covering piece for inhibiting nitrogen and phosphorus release of landscape lake sediment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113023819A true CN113023819A (en) | 2021-06-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110278752.4A Pending CN113023819A (en) | 2021-03-16 | 2021-03-16 | Composite material covering piece for inhibiting nitrogen and phosphorus release of landscape lake sediment |
Country Status (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114291986A (en) * | 2021-12-27 | 2022-04-08 | 华侨大学 | Preparation method of active covering plate for synchronously controlling release of nitrogen and phosphorus in sediment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09206800A (en) * | 1996-02-08 | 1997-08-12 | Ebara Corp | Treatment of water-area bottom mud |
| CN202671359U (en) * | 2012-04-01 | 2013-01-16 | 上海海洋大学 | Composite coverage piece capable of controlling release of sedimentary nitrogen and phosphorus |
| CN104876410A (en) * | 2015-04-29 | 2015-09-02 | 暨南大学 | In-situ continuous remediation method for heavy metals and/or nitrogen and phosphorus polluted bottom mud |
| CN106076252A (en) * | 2016-06-15 | 2016-11-09 | 北京建筑大学 | A kind of method utilizing waterworks sludge preparation denitrogenation dephosphorizing adsorbent simultaneously |
-
2021
- 2021-03-16 CN CN202110278752.4A patent/CN113023819A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09206800A (en) * | 1996-02-08 | 1997-08-12 | Ebara Corp | Treatment of water-area bottom mud |
| CN202671359U (en) * | 2012-04-01 | 2013-01-16 | 上海海洋大学 | Composite coverage piece capable of controlling release of sedimentary nitrogen and phosphorus |
| CN104876410A (en) * | 2015-04-29 | 2015-09-02 | 暨南大学 | In-situ continuous remediation method for heavy metals and/or nitrogen and phosphorus polluted bottom mud |
| CN106076252A (en) * | 2016-06-15 | 2016-11-09 | 北京建筑大学 | A kind of method utilizing waterworks sludge preparation denitrogenation dephosphorizing adsorbent simultaneously |
Non-Patent Citations (1)
| Title |
|---|
| 王运正等: "《现代锰冶金》", 30 September 2015, 冶金工业出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114291986A (en) * | 2021-12-27 | 2022-04-08 | 华侨大学 | Preparation method of active covering plate for synchronously controlling release of nitrogen and phosphorus in sediment |
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Application publication date: 20210625 |