CN119219188A - Sulfur autotrophic-heterotrophic synergistic denitrification filler and preparation method and application thereof - Google Patents
Sulfur autotrophic-heterotrophic synergistic denitrification filler and preparation method and application thereof Download PDFInfo
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- CN119219188A CN119219188A CN202411754821.4A CN202411754821A CN119219188A CN 119219188 A CN119219188 A CN 119219188A CN 202411754821 A CN202411754821 A CN 202411754821A CN 119219188 A CN119219188 A CN 119219188A
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- 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
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- 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
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- 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
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to the field of sewage treatment, in particular to a sulfur autotrophic-heterotrophic synergistic denitrification filler and a preparation method and application thereof. The sulfur autotrophic-heterotrophic synergistic denitrification filler provided by the invention combines the advantages of sulfur autotrophic denitrification and heterotrophic denitrification, and is an efficient and stable denitrification filler. The filler not only can optimize the growth environment of microorganisms and promote the synergistic effect of sulfur autotrophic denitrifying bacteria and heterotrophic denitrifying bacteria, but also can effectively prevent the premature falling of the biological film, thereby ensuring the continuous stability of the denitrification process.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a sulfur autotrophic-heterotrophic synergistic denitrification filler and a preparation method and application thereof.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
Nitrogen pollution in water is one of the main problems threatening the quality of water at present, and water eutrophication and water environment quality degradation caused by high-content nitrogen threaten the health of people. Biological denitrification is widely applied to deep denitrification due to the characteristics of high efficiency and low cost, and the secondary effluent deep denitrification process of a sewage plant mainly comprises a biological filter, an activated sludge process, a high-grade oxidation process, an artificial wetland and the like. The denitrification biological filter has the advantages of small occupied area, high denitrification efficiency, strong adsorption filtration, easy management and operation, low investment cost and the like, and has good application prospect in the field of deep denitrification of effluent of sewage plants.
The existing denitrification technology is divided into heterotrophic denitrification and autotrophic denitrification, wherein the organic matters are added to serve as denitrification matrixes to perform denitrification, the unit volume of a reactor is large in treatment capacity, but the problems of high cost and secondary pollution caused by residual organic matrixes are solved, inorganic carbon such as carbonate and bicarbonate is used as a carbon source, inorganic matters (such as H 2,S2-,Fe,Fe2+ and the like) are mainly used as electron donors for nitrate reduction to complete metabolism of microorganisms, nitrate is reduced into nitrogen, and autotrophic denitrification also faces some challenges, such as slow growth of sulfur autotrophic denitrifying bacteria, long filler film hanging time, short later residence time, insufficient pH buffering capacity and the like. In addition, the strength of the filler used for autotrophic denitrification is insufficient, so that the biofilm on the surface of the filler is easy to fall off, and the bacterial growth speed is difficult to keep up with the falling-off speed of the biofilm, thereby influencing the stability of the denitrification efficiency.
Therefore, development of a new high-efficiency denitrification biological filler is needed, and the biological filler is applied to wastewater treatment and has extremely important significance.
Disclosure of Invention
In order to overcome the problems, the invention provides a sulfur autotrophic-heterotrophic synergistic denitrification filler, and a preparation method and application thereof.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
In a first aspect of the invention, a sulfur autotrophic-heterotrophic synergistic denitrification filler is provided, which takes foam nickel as a carrier and loads sulfur autotrophic-heterotrophic synergistic denitrification raw materials;
The sulfur autotrophic-heterotrophic synergistic denitrification raw material comprises mixed sulfur source dry materials, mixed carbon source dry materials, a binder and ferroferric oxide;
the mixed sulfur source dry material comprises sulfur powder, pyrite powder and oyster shell powder;
the mixed carbon source dry material comprises polylactic acid and oxidized starch;
the binder is a mixed solution of sodium carboxymethyl cellulose, polyvinyl alcohol and water.
In a second aspect of the present invention, there is provided a method for preparing the sulfur autotrophic-heterotrophic synergistic denitrification filler of the first aspect, comprising the steps of:
(1) Adding the mixed sulfur source dry material, the mixed carbon source dry material and ferroferric oxide into a binder, and uniformly mixing to obtain a sulfur autotrophic-heterotrophic synergistic denitrification raw material;
(2) And mixing the sulfur autotrophic-heterotrophic synergistic denitrification raw material with foam nickel to obtain the sulfur autotrophic-heterotrophic synergistic denitrification filler.
In a third aspect, the invention provides the use of the sulfur autotrophic-heterotrophic synergistic denitrification filler according to the first aspect and/or the sulfur autotrophic-heterotrophic synergistic denitrification filler prepared by the preparation method according to the second method in sewage treatment.
The invention has the beneficial effects that:
(1) The invention provides a lightweight sulfur autotrophic-heterotrophic synergistic denitrification filler, which uses oyster shell powder as a main alkalinity supplement and an inorganic carbon source, wherein calcium carbonate in the oyster shell powder exists in a relatively stable form, has a slow release characteristic, can stably supplement alkalinity for a long time, and can avoid the rapid rise of the alkalinity, thereby effectively controlling the stability of pH value. In addition, oyster shell powder contains other trace elements such as magnesium, zinc, etc., which have promoting effect on the growth and metabolism of microorganisms.
(2) The sulfur autotrophic-heterotrophic synergistic denitrification filler provided by the invention adopts the foam nickel porous material as the main framework material of the filler, so that the high plasticity, the high elasticity, the high structural strength and the mass transfer uniformity of the filler are realized. These characteristics make the filler have wide application prospects and important practical values in bioreactors.
(3) The filler for sulfur autotrophic-heterotrophic synergistic denitrification provided by the invention is added with ferroferric oxide as a magnetic carrier, and has remarkable advantages in the aspects of microbial growth and application. The magnetic property of the microbial agent enables the distribution of the microorganisms in the reactor to be more uniform, and simultaneously improves the metabolic activity and the utilization efficiency of the microorganisms.
(4) The sulfur autotrophic-heterotrophic synergistic denitrification filler provided by the invention adopts polylactic acid and oxidized starch as slow-release carbon sources, the combination of the polylactic acid and the oxidized starch can realize the continuous release of the carbon sources, the slow-release characteristic of the polylactic acid and the quick release of the oxidized starch complement each other, the requirements of microorganisms in different growth stages are met together, the growth environment of the microorganisms can be optimized, and the metabolic activity of the microorganisms is improved.
(5) The sulfur autotrophic-heterotrophic synergistic denitrification filler sulfur provided by the invention takes sulfur and pyrite as common sulfur sources, the combination of the sulfur and the pyrite can fully play the advantages, the denitrification efficiency is improved, the sulfur does not need to be externally added with carbon sources, the reaction condition is mild, the pyrite contains more active ingredients and trace elements, and the microbial activity is promoted. In addition, the combination of the two can improve the dephosphorization effect.
(6) The sulfur autotrophic-heterotrophic synergistic denitrification filler provided by the invention combines the advantages of sulfur autotrophic denitrification and heterotrophic denitrification, and is an efficient and stable denitrification filler. The filler not only can optimize the growth environment of microorganisms and promote the synergistic effect of sulfur autotrophic denitrifying bacteria and heterotrophic denitrifying bacteria, but also can effectively prevent the premature falling of the biomembrane based on the porous property of the foam nickel and the adsorptivity of the filler, thereby ensuring the continuous stability of the denitrification process.
(7) The sulfur and the pyrite are used as the sulfur source together for the mixed sulfur source dry material, so that various benefits can be brought, including improvement of denitrification efficiency, improvement of dephosphorization effect, enhancement of microbial community stability, reduction of running cost and the like, and the advantages enable the sulfur autotrophic filler to have wide application prospects in the field of sewage treatment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
FIG. 1 is a graph showing the effect of removing nitrate nitrogen in Experimental example 1;
FIG. 2 is a graph showing the effect of removing nitrate nitrogen in Experimental example 2.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
In a first exemplary embodiment of the present invention, a sulfur autotrophic-heterotrophic synergistic denitrification filler is provided, which uses foam nickel as a carrier and is loaded with a sulfur autotrophic-heterotrophic synergistic denitrification raw material;
The sulfur autotrophic-heterotrophic synergistic denitrification raw material comprises mixed sulfur source dry materials, mixed carbon source dry materials, a binder and ferroferric oxide;
the mixed sulfur source dry material comprises sulfur powder, pyrite powder and oyster shell powder;
the mixed carbon source dry material comprises polylactic acid and oxidized starch;
the binder is a mixed solution of sodium carboxymethyl cellulose, polyvinyl alcohol and water.
In one or more embodiments, the mass ratio of the mixed sulfur source dry material, the mixed carbon source dry material, the binder and the ferroferric oxide is (3.5-4.5): 0.5-1.5): 4.5-5.5): 0.1.
In one or more embodiments, the particle sizes of the sulfur powder, the pyrite powder and the oyster shell powder are 75-100 mu m.
In one or more embodiments, the mass ratio of the sulfur powder to the pyrite powder to the oyster shell powder is (2.5-3.5): (0.5-1.5): 0.3.
In one or more embodiments, the mass ratio of the polylactic acid to the oxidized starch is (1.5-2.5): 0.5-1.5.
In one or more embodiments, the mass ratio of sodium carboxymethylcellulose to polyvinyl alcohol to water is (0.5-1.5): (2.5-3.5): 1000.
In a second exemplary embodiment of the present invention, there is provided a method for preparing the sulfur autotrophic-heterotrophic synergistic denitrification filler according to the first aspect, comprising the steps of:
(1) Adding the mixed sulfur source dry material, the mixed carbon source dry material and ferroferric oxide into a binder, and uniformly mixing to obtain a sulfur autotrophic-heterotrophic synergistic denitrification raw material;
(2) And mixing the sulfur autotrophic-heterotrophic synergistic denitrification raw material with foam nickel to obtain the sulfur autotrophic-heterotrophic synergistic denitrification filler.
In one or more embodiments, (1000-1500) mL of sulfur autotrophic-heterotrophic co-denitrification feedstock is added with (0.8-1.2) dm 3 of nickel foam.
In one or more embodiments, in the step (2), the method for obtaining the sulfur autotrophic-heterotrophic cooperative denitrification filler after mixing the sulfur autotrophic-heterotrophic cooperative denitrification raw material with the foam nickel comprises the steps of adding the foam nickel into the sulfur autotrophic-heterotrophic cooperative denitrification raw material, extruding and kneading, and then mechanically stirring to obtain the sulfur autotrophic-heterotrophic cooperative denitrification filler.
Preferably, the speed of the mechanical stirring is 100-150 r/min, preferably 120r/min, and the time of the mechanical stirring is 20-40 min, preferably 30 min.
In a third exemplary embodiment of the present invention, there is provided the use of the sulfur autotrophic-heterotrophic co-denitrification filler according to the first aspect and/or the sulfur autotrophic-heterotrophic co-denitrification filler prepared by the preparation method according to the second aspect in sewage treatment.
In order to enable those skilled in the art to more clearly understand the technical scheme of the present invention, the technical scheme of the present invention will be described in detail with reference to specific embodiments.
Example 1
(1) Preparing a mixed sulfur source dry material:
grinding sulfur, pyrite and oyster shell with grinder, sieving with 200 mesh sieve, and sieving. Weighing 3 parts of screened sulfur powder, 1 part of pyrite powder and 0.3 part of oyster shell powder, and stirring for 1 hour by adopting mechanical stirring (120 r/min) to uniformly mix the materials.
(2) Preparing a mixed solid carbon source dry material:
accurately weighing 2 parts of polylactic acid and 1 part of oxidized starch, and stirring for 1 hour by using a mechanical stirrer (120 r/min) to ensure that the materials are fully mixed.
(3) The binder solution was prepared by adding 1000 parts of deionized water to 1 part of sodium carboxymethylcellulose and 3 parts of polyvinyl alcohol, and then placing the mixture in a 100 ℃ oil bath to stir (120 r/min) for 1.5: 1.5 h until the mixture was completely dissolved.
(4) The preparation of the mixed slurry comprises the steps of adding 4 parts of mixed sulfur source dry materials and 1 part of solid carbon source dry materials into 5 parts of binder, mechanically stirring (120 r/min) for 15 min, adding 0.1 part of ferroferric oxide, continuously stirring (120 r/min) for 30min, and uniformly mixing.
(5) Adding foamed nickel with the size of 20mm multiplied by 20 multiplied by mm multiplied by 20 multiplied by mm into the mixed slurry according to the ratio of adding foamed nickel with the size of 1 dm 3 into the sulfur autotrophic-heterotrophic synergistic denitrification raw material of 1000 mL, extruding and kneading, and then mechanically stirring (120 r/min) for 30 min to fully absorb the mixed slurry. And finally, placing the foam nickel fully absorbing the mixed slurry into a vacuum drying oven, drying at 80 ℃ to 12h, taking out and cooling to room temperature after the drying is finished, and obtaining the sulfur autotrophic-heterotrophic synergistic denitrification filler.
Example 2
(1) Preparing a mixed sulfur source dry material:
Grinding sulfur, pyrite and oyster shell with grinder, sieving with 200 mesh sieve, and sieving. Weighing 1 part of screened sulfur powder, 3 parts of pyrite powder and 0.3 part of oyster shell powder, and stirring for 1 hour by adopting mechanical stirring (120 r/min) to uniformly mix the materials.
(2) Preparing a mixed solid carbon source dry material:
accurately weighing 2 parts of polylactic acid and 1 part of oxidized starch, and stirring for 1 hour by using a mechanical stirrer (120 r/min) to ensure that the materials are fully mixed.
(3) The binder solution was prepared by adding 1000 parts of deionized water to 1 part of sodium carboxymethylcellulose and 3 parts of polyvinyl alcohol, and then placing the mixture in a 100 ℃ oil bath to stir (120 r/min) for 1.5: 1.5 h until the mixture was completely dissolved.
(4) The preparation of the mixed slurry comprises the steps of adding 4 parts of mixed sulfur source dry materials and 1 part of solid carbon source dry materials into 5 parts of binder, mechanically stirring (120 r/min) for 15 min, adding 0.1 part of ferroferric oxide, continuously stirring (120 r/min) for 30min, and uniformly mixing.
(5) Adding foamed nickel with the size of 20mm multiplied by 20 multiplied by mm multiplied by 20 multiplied by mm into the mixed slurry according to the ratio of adding foamed nickel with the size of 1 dm 3 into the sulfur autotrophic-heterotrophic synergistic denitrification raw material of 1000 mL, extruding and kneading, and then mechanically stirring (120 r/min) for 30 min to fully absorb the mixed slurry. And finally, placing the foam nickel fully absorbing the mixed slurry into a vacuum drying oven, drying at 80 ℃ to 12h, taking out and cooling to room temperature after the drying is finished, and obtaining the sulfur autotrophic-heterotrophic synergistic denitrification filler.
Example 3
(1) Preparing a mixed sulfur source dry material:
Grinding sulfur, pyrite and oyster shell with grinder, sieving with 200 mesh sieve, and sieving. 3 parts of screened sulfur powder, 1.5 parts of pyrite powder and 0.3 part of oyster shell powder are weighed and stirred for 1 hour by mechanical stirring (120 r/min) so as to be uniformly mixed.
(2) Preparing a mixed solid carbon source dry material:
accurately weighing 2 parts of polylactic acid and 1 part of oxidized starch, and stirring for 1 hour by using a mechanical stirrer (120 r/min) to ensure that the materials are fully mixed.
(3) The adhesive solution is prepared by taking 1 part of sodium carboxymethyl cellulose and 3 parts of polyvinyl alcohol, adding 1000 parts of deionized water, and placing the mixture in a 100 ℃ oil bath for high-temperature stirring (120 r/min) for 1.5 h until the mixture is completely dissolved.
(4) The preparation of the mixed slurry comprises the steps of adding 4 parts of mixed sulfur source dry materials and 1 part of solid carbon source dry materials into 5 parts of binder, mechanically stirring (120 r/min) for 15 min, adding 0.1 part of ferroferric oxide, continuously stirring (120 r/min) for 30min, and uniformly mixing.
(5) Adding foamed nickel with the size of 20mm multiplied by 20 multiplied by mm multiplied by 20 multiplied by mm into the mixed slurry according to the ratio of adding foamed nickel with the size of 1 dm 3 into the sulfur autotrophic-heterotrophic synergistic denitrification raw material of 1000 mL, extruding and kneading, and then mechanically stirring (120 r/min) for 30 min to fully absorb the mixed slurry. And finally, placing the foam nickel fully absorbing the mixed slurry into a vacuum drying oven, drying at 80 ℃ to 12h, taking out and cooling to room temperature after the drying is finished, and obtaining the sulfur autotrophic-heterotrophic synergistic denitrification filler.
Experimental example 1
The three sulfur autotrophic-heterotrophic synergistic denitrification fillers prepared in the embodiments 1-3 are filled into three upflow reactors with the volume of 5L, the filler occupies 2/3 of the reactor volume, water is manually distributed in a laboratory, the pH is about 7, the total nitrogen concentration is 150 mg/L, the nitrate concentration is 140 mg/L, the total phosphorus is1 mg/L, the hydraulic retention time is 24h, the water temperature is controlled to be 30 ℃, and no organic matters are added. The reactor is respectively inoculated with 3g/L of sulfur autotrophic bacteria substrate sludge and 3g/L of heterotrophic denitrifying bacteria substrate sludge.
The experimental results are shown in fig. 1, and after 40 days of operation, the removal rates of the reactor corresponding to the filler prepared in examples 1-3 are 95.78%,81.43% and 85.13%, respectively. The sulfur autotrophic-heterotrophic synergistic denitrification filler prepared in the embodiment 1-3 has remarkable effect of removing nitrate nitrogen in sewage, and the filler prepared in the formula in the embodiment 1 has the best effect of removing nitrate nitrogen in sewage, and has more remarkable denitrification advantage.
Example 4
(1) Preparing a mixed sulfur source dry material:
Grinding sulfur, pyrite and oyster shell with grinder, sieving with 200 mesh sieve, and sieving. Weighing 3 parts of screened sulfur powder, 1 part of pyrite powder and 0.3 part of oyster shell powder, and stirring for 1 hour by adopting mechanical stirring (120 r/min) to uniformly mix the materials.
(2) Preparing a mixed solid carbon source dry material:
accurately weighing 2 parts of polylactic acid and 1 part of oxidized starch, and stirring for 1 hour by using a mechanical stirrer (120 r/min) to ensure that the materials are fully mixed.
(3) The binder solution was prepared by adding 1000 parts of deionized water to 1 part of sodium carboxymethylcellulose and 3 parts of polyvinyl alcohol, and then placing the mixture in a 100 ℃ oil bath to stir (120 r/min) for 1.5: 1.5 h until the mixture was completely dissolved.
(4) The mixed slurry is prepared by adding 4.5 parts of mixed sulfur source dry material and 0.5 part of solid carbon source dry material into 5 parts of binder, mechanically stirring (120 r/min) for 15 min, adding 0.1 part of ferroferric oxide, continuously stirring (120 r/min) for 30min, and uniformly mixing.
(5) Adding foamed nickel with the size of 20mm multiplied by 20 multiplied by mm multiplied by 20 multiplied by mm into the mixed slurry according to the ratio of adding foamed nickel with the size of 1 dm 3 into the sulfur autotrophic-heterotrophic synergistic denitrification raw material of 1000 mL, extruding and kneading, and then mechanically stirring (120 r/min) for 30 min to fully absorb the mixed slurry. And finally, placing the foam nickel fully absorbing the mixed slurry into a vacuum drying oven, drying at 80 ℃ to 12h, taking out and cooling to room temperature after the drying is finished, and obtaining the sulfur autotrophic-heterotrophic synergistic denitrification filler.
Example 5
(1) Preparing a mixed sulfur source dry material:
Grinding sulfur, pyrite and oyster shell with grinder, sieving with 200 mesh sieve, and sieving. Weighing 3 parts of screened sulfur powder, 1 part of pyrite powder and 0.3 part of oyster shell powder, and stirring for 1 hour by adopting mechanical stirring (120 r/min) to uniformly mix the materials.
(2) Preparing a mixed solid carbon source dry material:
accurately weighing 2 parts of polylactic acid and 1 part of oxidized starch, and stirring for 1 hour by using a mechanical stirrer (120 r/min) to ensure that the materials are fully mixed.
(3) The binder solution was prepared by adding 1000 parts of deionized water to 1 part of sodium carboxymethylcellulose and 3 parts of polyvinyl alcohol, and then placing the mixture in a 100 ℃ oil bath to stir (120 r/min) for 1.5: 1.5 h until the mixture was completely dissolved.
(4) The preparation of the mixed slurry comprises the steps of adding 3.5 parts of mixed sulfur source dry materials and 1.5 parts of solid carbon source dry materials into 5 parts of binders, mechanically stirring (120 r/min) for 15 min, adding 0.1 part of ferroferric oxide, continuously stirring (120 r/min) for 30min, and uniformly mixing.
(5) Adding foamed nickel with the size of 20mm multiplied by 20 multiplied by mm multiplied by 20 multiplied by mm into the mixed slurry according to the ratio of adding foamed nickel with the size of 1 dm 3 into the sulfur autotrophic-heterotrophic synergistic denitrification raw material of 1000 mL, extruding and kneading, and then mechanically stirring (120 r/min) for 30 min to fully absorb the mixed slurry. And finally, placing the foam nickel fully absorbing the mixed slurry into a vacuum drying oven, drying at 80 ℃ to 12h, taking out and cooling to room temperature after the drying is finished, and obtaining the sulfur autotrophic-heterotrophic synergistic denitrification filler.
Experimental example 2
The three sulfur autotrophic-heterotrophic synergistic denitrification fillers prepared in the embodiments 1,4 and 5 are filled into three upflow reactors with 5L volume, the filler occupies 2/3 of the reactor volume, water is manually distributed in a laboratory, the pH is about 7, the total nitrogen concentration is 150 mg/L, the nitrate nitrogen concentration is 145 mg/L, the total phosphorus is 1 mg/L, the hydraulic retention time is 24 h, the water temperature is controlled to be 30 ℃, and no organic matters are added. Inoculating sulfur autotrophic bacteria substrate sludge 3 g/L and heterotrophic denitrifying bacteria substrate sludge 3 g/L in the reactor
The experimental results are shown in fig. 2, and after 40 days of continuous operation, the removal efficiencies of the reactor corresponding to the fillers prepared in examples 1,4 and 5 on nitrate nitrogen are 95.78%, 86.32% and 89.89%, respectively. It is apparent that the sulfur autotrophic-heterotrophic synergistic denitrification fillers prepared in examples 1,4 and 5 all show remarkable effect in removing nitrate nitrogen in sewage, while the filler prepared in the formula of example 1 is more remarkable, has the best effect of removing nitrate nitrogen and shows more remarkable denitrification capability. From an in-depth analysis of the experimental data we can conclude that the formulation proportions employed in example 1 are the optimal choice.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A sulfur autotrophic-heterotrophic synergistic denitrification filler is characterized in that foam nickel is used as a carrier to load sulfur autotrophic-heterotrophic synergistic denitrification raw materials;
The sulfur autotrophic-heterotrophic synergistic denitrification raw material comprises mixed sulfur source dry materials, mixed carbon source dry materials, a binder and ferroferric oxide;
the mixed sulfur source dry material comprises sulfur powder, pyrite powder and oyster shell powder;
the mixed carbon source dry material comprises polylactic acid and oxidized starch;
the binder is a mixed solution of sodium carboxymethyl cellulose, polyvinyl alcohol and water.
2. The sulfur autotrophic-heterotrophic synergistic denitrification filler according to claim 1, wherein the mass ratio of the mixed sulfur source dry material, the mixed carbon source dry material, the binder and the ferroferric oxide is (3.5-4.5): 0.5-1.5): 4.5-5.5): 0.1.
3. The sulfur autotrophic-heterotrophic synergistic denitrification filler of claim 1, wherein the particle size of the sulfur powder, the pyrite powder and the oyster shell powder is 75-100 μm.
4. The sulfur autotrophic-heterotrophic synergistic denitrification filler according to claim 1, wherein the mass ratio of the sulfur powder to the iron pyrite powder to the oyster shell powder is (2.5-3.5): (0.5-1.5): 0.3.
5. The sulfur autotrophic-heterotrophic synergistic denitrification filler according to claim 1, wherein the mass ratio of polylactic acid to oxidized starch is (1.5-2.5): 0.5-1.5.
6. The sulfur autotrophic-heterotrophic synergistic denitrification filler according to claim 1, wherein the mass ratio of sodium carboxymethylcellulose, polyvinyl alcohol and water is (0.5-1.5): (2.5-3.5): 1000.
7. The method for preparing the sulfur autotrophic-heterotrophic synergistic denitrification filler according to any one of claims 1 to 6, which is characterized by comprising the following steps:
(1) Adding the mixed sulfur source dry material, the mixed carbon source dry material and ferroferric oxide into a binder, and uniformly mixing to obtain a sulfur autotrophic-heterotrophic synergistic denitrification raw material;
(2) And mixing the sulfur autotrophic-heterotrophic synergistic denitrification raw material with foam nickel to obtain the sulfur autotrophic-heterotrophic synergistic denitrification filler.
8. The method according to claim 7, wherein (0.8-1.2) dm 3 of nickel foam is added to (1000-1500) mL of the sulfur autotrophic-heterotrophic synergistic denitrification material.
9. The method of preparing the sulfur autotrophic-heterotrophic co-denitrification filler according to claim 7, wherein in the step (2), the sulfur autotrophic-heterotrophic co-denitrification material is mixed with the foam nickel, and the method comprises the steps of adding the foam nickel into the sulfur autotrophic-heterotrophic co-denitrification material, extruding and kneading, and then mechanically stirring to obtain the sulfur autotrophic-heterotrophic co-denitrification filler.
10. The use of the sulfur autotrophic-heterotrophic synergistic denitrification filler of any one of claims 1-6 in sewage treatment.
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