CN117658317A - Denitrifying carbon source with low sludge yield and garbage leachate treatment method using carbon source - Google Patents

Denitrifying carbon source with low sludge yield and garbage leachate treatment method using carbon source Download PDF

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CN117658317A
CN117658317A CN202311663420.3A CN202311663420A CN117658317A CN 117658317 A CN117658317 A CN 117658317A CN 202311663420 A CN202311663420 A CN 202311663420A CN 117658317 A CN117658317 A CN 117658317A
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carbon source
photocatalyst
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tio
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CN117658317B (en
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汪嘉涛
石锵锵
张云
邵峰
陈坚刚
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Hangzhou Green Energy Environmental Protection Power Co ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
    • B01J21/06—Silicon, titanium, zirconium or hafnium; Oxides or hydroxides thereof
    • B01J21/063—Titanium; Oxides or hydroxides thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/06—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of zinc, cadmium or mercury
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/163—Nitrates
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • C02F2101/166—Nitrites
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/06—Contaminated groundwater or leachate

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Catalysts (AREA)

Abstract

The application discloses a denitrification carbon source with low sludge yield and a landfill leachate treatment method using the carbon source. The denitrification carbon source comprises the following raw materials in parts by mass: 10 parts of glucose; 5-10 parts of organic acid or organic acid salt; znO/C-TiO 2 2-4 parts of photocatalyst; 0.1 to 0.2 part of microelements; the photocatalyst comprises the following raw materials in parts by mass: 0.1 to 0.4 part of zinc oxide; 1 part of tetrabutyl titanate; 1.5 to 2 portions of terephthalic acid.5 parts; 0.2 to 0.3 part of molasses; 30-50 parts of N, N-dimethylformamide; 5-10 parts of methanol; the tetrabutyl titanate and terephthalic acid are subjected to coordination deposition on the surface of zinc oxide to obtain ZnO/C-TiO 2 A photocatalyst. The carbon source is safe and harmless, has high reaction rate and has the characteristic of low sludge yield.

Description

Denitrifying carbon source with low sludge yield and garbage leachate treatment method using carbon source
Technical Field
The application relates to the field of landfill leachate treatment, in particular to a denitrification carbon source with low sludge yield and a landfill leachate treatment method using the carbon source.
Background
Denitrification processes are a technique for removing nitrogen compounds from wastewater. The purpose of this process is to reduce nitrate and nitrite in the wastewater to nitrogen to remove these hazardous substances. In this process, the carbon source plays a critical role, and it can not only provide energy for the microorganisms, but also provide enough electron donors to effect denitrification.
Typically, common carbon sources for denitrification include methanol and glucose. Methanol is used as a carbon source, the denitrification rate is faster than that of glucose carbon source, and the methanol can be used as a quick-acting carbon source. However, methanol is used as a flammable and explosive product, and has great potential safety hazard in the transportation and storage processes, so that the use is strictly regulated. Glucose is a green, safe, abundant and low-cost high-quality carbon source and gradually becomes a mainstream biological carbon source. However, with the glucose carbon source, bacteria are greatly propagated in the denitrification process, so that the volume of the activated sludge is obviously increased, the phenomenon of pipeline blockage is increased, the sludge discharge workload is increased, and the normal operation of a sewage treatment system is influenced. Based on this, it is necessary to provide a denitrification carbon source which is safe and harmless and has low sludge yield, thereby improving sewage treatment efficiency.
Disclosure of Invention
The application provides a denitrification carbon source with low sludge yield and a landfill leachate treatment method using the carbon source, wherein the carbon source is safe and harmless, and the sludge yield is low.
In a first aspect, the present application provides a denitrified carbon source with low sludge yield, comprising the following raw materials in parts by mass:
10 parts of glucose;
5-10 parts of organic acid or organic acid salt;
ZnO/C-TiO 2 2-4 parts of photocatalyst;
0.1 to 0.2 part of microelements;
the photocatalyst comprises the following raw materials in parts by mass:
0.1 to 0.4 part of zinc oxide;
1 part of tetrabutyl titanate;
1.5 to 2.5 parts of terephthalic acid;
0.2 to 0.3 part of molasses;
30-50 parts of N, N-dimethylformamide;
5-10 parts of methanol;
the tetrabutyl titanate and terephthalic acid are subjected to coordination deposition on the surface of zinc oxide to obtain ZnO/C-TiO 2 A photocatalyst.
The application takes safe and harmless glucose and organic acid or organic acid salt as denitrification carbon sources, and can degrade the glucose into small molecule intermediate products such as pyruvic acid, lactic acid, ethanol, methanol, acetyl coenzyme A and the like by adding the photocatalyst, and the small molecule substances can be used as high-quality denitrification carbon sources, so that the sludge yield can be effectively reduced while the denitrification rate is improved.
The optical ZnO/C-TiO 2 The catalyst is a three-system composite material with a core-shell structure, which is formed by three semiconductor materials, different semiconductor materials are mutually overlapped, and can form a rich Z-type heterojunction.
In the preparation process of the photocatalyst, zinc oxide is used as a seed crystal, tetrabutyl titanate and terephthalic acid are coordinated on the surface of the zinc oxide, and a metal organic framework (MIL-125) is formed by deposition. Molasses is doped into MIL-125 as a carbon source, carbon doped titanium dioxide crystals can be obtained after high-temperature calcination, and finally the three-system composite photocatalyst taking zinc oxide as a core layer and C-ZnO as a shell layer is formed.
Preferably, the preparation steps of the photocatalyst are as follows:
dispersing zinc oxide in a mixed solution of N, N-dimethylformamide and methanol, adding molasses, tetrabutyl titanate and terephthalic acid, stirring and reacting for 0.5-1 h, transferring the solution to 150-170 ℃ for reacting for 20-24 h, cooling, removing supernatant to obtain precipitate, drying the precipitate, and grinding into ZnO/MIL-125 powder;
calcining ZnO/MIL-125 powder at 500-550 ℃ for 2-4 h to obtain ZnO/C-TiO 2 A photocatalyst.
The calcining temperature of the ZnO/MIL-125 powder is controlled to be 500-550 ℃, so that MIL-125 can be converted into rutile type titanium dioxide crystals, and the ZnO/MIL-125 powder has excellent photocatalytic activity under a visible light spectrum. When the calcination temperature is lower than 500 ℃, anatase titania, which has poor visible light catalytic activity, is obtained.
Preferably, the zinc oxide is used in an amount of 0.2 to 0.3.
Preferably, the D50 particle size of the zinc oxide is 1-10 nm.
The zinc oxide seed crystal dosage is properly increased, which is beneficial to obtaining ZnO/C-TiO with polynuclear structure 2 The photocatalyst can increase the Z-type heterojunction content and improve the photocatalytic efficiency. However, too much zinc oxide increases the probability of agglomeration and is disadvantageous for its dispersion. In addition, zinc oxide with small particle size is favorable for forming a multi-core structure.
Preferably, the organic acid or organic acid salt is selected from one or more of gluconic acid, gluconate, succinic acid, succinate, lactic acid, lactate, acetic acid, acetate, malonic acid, malonate, citric acid, citrate, glycollic acid and glycolate.
Preferably, the microelements are selected from one or more of salts of iron, copper, manganese, zinc, magnesium, cobalt and molybdenum.
Preferably, the ZnO/C-TiO 2 Amino groups are grafted on the surface of the photocatalyst.
Preferably, the amino grafting method comprises the following steps:
dissolving an aminosilane coupling agent in an alcohol solvent, heating to 50-60 ℃, then dropwise adding an alcohol-water mixed solution, heating to 110-130 ℃, and stirring for reacting for 1-2 hours to obtain an aminosilane oligomer; cooling to 50-60 deg.c and adding ZnO/C-TiO 2 The photocatalyst is obtained by stirring, filtering, washing and drying。
Preferably, the aminosilane coupling agent is mixed with ZnO/C-TiO 2 The mass ratio of the photocatalyst is 0.2-0.4:1; the aminosilane coupling agent is at least one selected from 3-aminopropyl trimethoxy silane and 3-aminopropyl triethoxy silane.
The degradation of glucose depends on the oxidation-reduction effect of hydroxyl free radicals, superoxide free radicals and hole electron pairs generated by a photocatalyst, but glucose is free in sewage and is difficult to capture and react, and the degradation rate is slow. By grafting amino groups on the surface of the photocatalyst, the adsorption effect can be generated on free glucose in sewage, so that the degradation of the photocatalyst on glucose is quickened, the denitrification rate is favorably improved, and the sludge yield is reduced.
In addition, the aminosilane coupling agent is subjected to hydrolytic polycondensation in advance to prepare the oligomer, so that the oligomer can be mutually bonded to form a network structure, and compared with a short-chain aminosilane coupling agent, the adsorption effect on glucose can be effectively improved.
In a second aspect, the present application provides a landfill leachate treatment method, which uses a denitrification process for denitrification treatment, and uses the denitrification carbon source as claimed in any one of claims 1 to 9.
In summary, the application has the following beneficial effects:
1. the application adopts glucose, organic acid or organic acid salt and ZnO/C-TiO 2 The photocatalyst can obtain a carbon source with safety, no harm, low sludge yield and high denitrification rate.
2. ZnO/C-TiO of the present application 2 The photocatalyst is a three-system composite material, has excellent visible light catalytic activity, contains abundant Z-type heterojunction, is matched with a network structure formed by amino silane oligomer with adsorption effect on the surface, can quickly degrade glucose into micromolecular products, improves the denitrification rate, and reduces the sludge yield.
Detailed Description
Examples of preparation of starting materials and/or intermediates
Preparation example 1
ZnO/C-TiO 2 The photocatalyst is prepared by the following steps:
dispersing 0.3kg of zinc oxide (D50 particle size is 5 nm) in 40L of mixed solution of N, N-dimethylformamide and 8L of methanol, adding 1kg of tetrabutyl titanate and 2.2kg of terephthalic acid, stirring uniformly, then adding 0.3kg of molasses, stirring and reacting for 0.5h, transferring the solution to 160 ℃ for reacting for 20h, cooling, removing supernatant to obtain precipitate, washing the precipitate with methanol and N, N-dimethylformamide for three times respectively, transferring to a 60 ℃ drying oven for drying, and grinding into ZnO/MIL-125 powder;
calcining ZnO/MIL-125 powder at 500 ℃ for 3 hours to obtain ZnO/C-TiO 2 A photocatalyst.
Preparation example 2
ZnO/C-TiO 2 The photocatalyst is prepared by the following steps:
dispersing 0.2kg of zinc oxide (D50 particle size is 5 nm) in a mixed solution of 35L of N, N-dimethylformamide and 6.5L of methanol, adding 1kg of tetrabutyl titanate and 1.8kg of terephthalic acid, then adding 0.2kg of molasses, stirring and reacting for 0.5h, transferring the solution to 150 ℃ for reacting for 24h, cooling, removing supernatant to obtain precipitate, washing the precipitate with methanol and N, N-dimethylformamide for three times respectively, transferring to a drying oven at 60 ℃, drying, and grinding into ZnO/MIL-125 powder;
calcining ZnO/MIL-125 powder at 550 ℃ for 3 hours to obtain ZnO/C-TiO 2 A photocatalyst.
Preparation example 3
ZnO/C-TiO 2 The photocatalyst differs from preparation 1 in that the amount of zinc oxide used is 0.1kg.
Preparation example 4
ZnO/C-TiO 2 The photocatalyst differs from preparation 1 in that the amount of zinc oxide used is 0.4kg.
Preparation example 5
Amino grafted ZnO/C-TiO 2 The photocatalyst is different from preparation example 1 in that ZnO/C-TiO is prepared 2 The amino group is grafted on the surface of the photocatalyst, and the specific operation is as follows:
300g of 3-aminopropyl triethoxyDissolving the silane in 1L of ethanol, heating to 50 ℃, then dropwise adding an alcohol-water mixed solution obtained by mixing 20g of water and 80g of ethanol, heating to 120 ℃, and stirring for reacting for 2 hours to obtain an aminosilane oligomer; cooling to 50deg.C, adding 100g ZnO/C-TiO 2 The photocatalyst is obtained by stirring and reacting for 20min, filtering, washing with ethanol for three times, and drying at 60 ℃.
Preparation example 6
Amino grafted ZnO/C-TiO 2 The photocatalyst is different from preparation example 1 in that ZnO/C-TiO is prepared 2 The amino group is grafted on the surface of the photocatalyst, and the specific operation is as follows:
300g of 3-aminopropyl triethoxysilane are dissolved in 1L of ethanol, 100g of ZnO/C-TiO are added 2 The photocatalyst is obtained by stirring and reacting for 20min, filtering, washing with ethanol for three times, and drying at 60 ℃.
Preparation example 7
ZnO/TiO 2 The photocatalyst differs from preparation example 1 in that no molasses was added to the feedstock.
Preparation example 8
C-TiO 2 The photocatalyst is prepared by the following steps:
mixing 40L of N, N-dimethylformamide and 8L of methanol uniformly to obtain a mixed solution, adding 1kg of tetrabutyl titanate and 2.2kg of terephthalic acid, uniformly stirring, adding 0.3kg of molasses, stirring and reacting for 0.5h, transferring the solution to 150 ℃ for reaction for 24h, cooling and removing supernatant to obtain a precipitate, washing the precipitate with methanol and N, N-dimethylformamide for three times respectively, transferring the precipitate to a drying oven at 60 ℃, drying, and grinding into MIL-125 powder;
calcining MIL-125 powder at 500deg.C for 3 hr to obtain C-TiO 2 A photocatalyst.
Examples
Example 1
The denitrifying carbon source with low sludge yield is prepared by stirring and mixing the following raw materials in proportion:
glucose 10kg, acetic acid 5kg, acetate 1kg, znO/C-TiO obtained in preparation example 1 2 Photocatalyst 2.8kg, 0.05kg sulfiteIron, 0.05kg zinc sulfate, 0.02kg sodium molybdate.
Example 2
The denitrifying carbon source with low sludge yield is prepared by stirring and mixing the following raw materials in proportion:
10kg of glucose, 8.5kg of acetic acid and ZnO/C-TiO obtained in preparation example 2 2 3.6kg of photocatalyst, 0.03kg of ferrous sulfate, 0.05kg of magnesium sulfate, 0.05kg of zinc sulfate and 0.02kg of sodium molybdate.
Example 3
A denitrifying carbon source with low sludge yield is different from example 1 in that ZnO/C-TiO obtained in preparation example 2 is used in an equivalent amount 2 Photocatalyst is substituted for ZnO/C-TiO obtained in preparation example 1 2 A photocatalyst.
Example 4
A denitrifying carbon source with low sludge yield is different from example 1 in that ZnO/C-TiO obtained in preparation example 4 is used in an equivalent amount 2 Photocatalyst is substituted for ZnO/C-TiO obtained in preparation example 1 2 A photocatalyst.
Example 5
A denitrifying carbon source with low sludge yield is different from example 1 in that ZnO/C-TiO obtained in preparation example 5 is used in an equivalent amount 2 Photocatalyst is substituted for ZnO/C-TiO obtained in preparation example 1 2 A photocatalyst.
Example 6
A denitrifying carbon source with low sludge yield is different from example 1 in that ZnO/C-TiO obtained in preparation example 6 is used in an equivalent amount 2 Photocatalyst is substituted for ZnO/C-TiO obtained in preparation example 1 2 A photocatalyst.
Comparative example
Comparative example 1
A denitrifying carbon source with low sludge yield is different from example 1 in that ZnO/TiO obtained in preparation example 7 is used in an equivalent amount 2 Photocatalyst is substituted for ZnO/C-TiO obtained in preparation example 1 2 A photocatalyst.
Comparative example 2
A denitrifying carbon source with low sludge yield is different from example 1 in that the same amount of C-TiO obtained in preparation example 8 is used 2 Photocatalyst replacement systemZnO/C-TiO obtained in preparation example 1 2 A photocatalyst.
Comparative example 3
A denitrifying carbon source with low sludge yield is different from example 1 in that an equivalent amount of TiO is used 2 (D50 particle diameter of 20 nm) in place of ZnO/C-TiO obtained in preparation example 1 2 A photocatalyst.
Comparative example 4
A denitrifying carbon source with low sludge yield is different from example 1 in that ZnO/C-TiO is not added 2 A photocatalyst.
Performance test
Test 1: denitrification denitrification effect test
(1) Mixing domestic sewage and activated sludge to prepare a reaction system, performing denitrification and denitrification under the irradiation of a xenon lamp, and adding KNO into the domestic sewage 3 Enabling NO in the system 3- The initial concentration of the-N reaches 50mg/L, the total suspended solid concentration (MLSS) of the mixed solution of the reaction system is 4000mg/L, and the MLVSS/MLSS is 0.7-0.75. The denitrification condition is 28+ -0.5deg.C, 120r/min water bath heating and stirring, xenon lamp (4000W, wavelength 300-800 nm). Adding the denitrifying carbon sources of the embodiment and the comparative example into a reaction system respectively, wherein the added carbon sources are in an amount such that the concentration of COD provided by the added carbon source is 50mgCOD/L in the final reaction system, comparing the denitrifying effect, taking the added denitrifying carbon source as the starting time, sampling at intervals to determine NO 3- -change in N concentration and calculating NO 3- -N removal rate.
(2) In the denitrification process, the initial volume of activated sludge (before adding the carbon source) and the volume change rate of activated sludge after adding the carbon source for 10 hours were measured.
TABLE 1 denitrification Effect test results
Analysis of test results
(1) As can be seen by combining examples 1 to 6 and comparative examples 1 to 4 and by combining Table 1, the present application is made by adding ZnO/C-TiO to a denitrified carbon source 2 The photocatalyst can effectively relieve the problem of sludge yield increase caused by the use of glucose, and simultaneously improves the denitrification rate. The reason for this may be that ZnO/C-TiO 2 The photocatalyst can effectively degrade glucose, and intermediate products are easily absorbed and utilized by denitrifying bacteria, so that the denitrification rate is improved. More importantly, the bacteria cannot easily produce sludge by using intermediate products as carbon sources.
(2) As can be seen from the combination of example 1 and comparative examples 1 to 4 and Table 1, the ratio of ZnO/TiO is compared with that of ZnO/TiO 2 、C-TiO 2 And TiO 2 Equal photo-catalyst, znO/C-TiO is adopted 2 The photocatalyst can obviously improve the NO 3- -removal rate of N. The reason for this may be that ZnO/C-TiO 2 The three-system composite photocatalyst is formed by compounding three semiconductor materials, can effectively expand the photocatalysis response spectrum, improves the catalytic degradation activity under visible light, can form rich Z-shaped heterojunctions at the mutual superposition positions of different semiconductor materials, improves the photocatalysis efficiency, promotes the degradation of organic matters such as glucose and the like under the illumination condition, thereby improving the denitrification rate and reducing the sludge yield.
In addition, znO/C-TiO of the present application 2 The photocatalyst also has a multi-core-shell structure, and can increase the content of the Z-type heterojunction, improve the photocatalytic activity and further improve the denitrification efficiency.
(3) As can be seen by combining example 1 and examples 5-6 and combining Table 1, the present application facilitates increasing the denitrification rate and reducing the sludge yield by controlling the mass ratio of zinc oxide to tetrabutyl titanate to be 0.2-0.3. The reason for this is probably that the ZnO/C-TiO with the multi-core-shell structure can be improved by increasing the zinc oxide amount in a proper amount 2 Thereby enhancing the photocatalytic activity and improving the denitrification efficiency.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.

Claims (10)

1. The denitrification carbon source with low sludge yield is characterized by comprising the following raw materials in parts by mass:
10 parts of glucose;
5-10 parts of organic acid or organic acid salt;
ZnO/C-TiO 2 2-4 parts of photocatalyst;
0.1 to 0.2 part of microelements;
the photocatalyst comprises the following raw materials in parts by mass:
0.1 to 0.4 part of zinc oxide;
1 part of tetrabutyl titanate;
1.5 to 2.5 parts of terephthalic acid;
0.2 to 0.3 part of molasses;
30-50 parts of N, N-dimethylformamide;
5-10 parts of methanol;
the tetrabutyl titanate and terephthalic acid are subjected to coordination deposition on the surface of zinc oxide to obtain ZnO/C-TiO 2 A photocatalyst.
2. The low sludge yield denitrified carbon source as claimed in claim 1, wherein the photocatalyst is prepared by the steps of:
dispersing zinc oxide in a mixed solution of N, N-dimethylformamide and methanol, adding molasses, tetrabutyl titanate and terephthalic acid, stirring and reacting for 0.5-1 h, transferring the solution to 150-170 ℃ for reacting for 20-24 h, cooling, removing supernatant to obtain precipitate, drying the precipitate, and grinding into ZnO/MIL-125 powder;
calcining ZnO/MIL-125 powder at 500-550 ℃ for 1-3 h to obtain ZnO/C-TiO 2 A photocatalyst.
3. The low sludge yield denitrification carbon source according to claim 1, wherein the zinc oxide is used in an amount of 0.2 to 0.3.
4. A low sludge yield denitrified carbon source as claimed in claim 3, wherein the zinc oxide has a D50 particle size of 1 to 10nm.
5. The low sludge yield denitrified carbon source as claimed in claim 1, wherein the organic acid or organic acid salt is selected from one or more of gluconic acid, gluconate, succinic acid, succinate, lactic acid, lactate, acetic acid, acetate, malonic acid, malonate, citric acid, citrate, glycolate.
6. The low sludge yield denitrified carbon source as claimed in claim 1, wherein the trace elements are selected from one or more of salts of iron, copper, manganese, zinc, magnesium, cobalt, molybdenum.
7. The low sludge yield denitrified carbon source as claimed in claim 1, wherein the ZnO/C-TiO 2 Amino groups are grafted on the surface of the photocatalyst.
8. The low sludge yield denitrifying carbon source as claimed in claim 7, wherein the amino grafting method is:
dissolving an aminosilane coupling agent in an alcohol solvent, heating to 50-60 ℃, then dropwise adding an alcohol-water mixed solution, heating to 110-130 ℃, and stirring for reacting for 1-2 hours to obtain an aminosilane oligomer; cooling to 50-60 deg.c and adding ZnO/C-TiO 2 The photocatalyst is obtained by stirring, filtering, washing and drying.
9. The low sludge yield denitrified carbon source as claimed in claim 8, wherein the aminosilane coupling agent is combined with ZnO/C-TiO 2 The mass ratio of the photocatalyst is 0.2-0.4:1; the aminosilane coupling agent is at least one selected from 3-aminopropyl trimethoxy silane and 3-aminopropyl triethoxy silane.
10. A method for treating landfill leachate, which is characterized in that denitrification is carried out by adopting a denitrification process, and the denitrification carbon source as claimed in any one of claims 1 to 9 is adopted.
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