CN113350994A - Kitchen waste gas treatment method - Google Patents
Kitchen waste gas treatment method Download PDFInfo
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- CN113350994A CN113350994A CN202110752412.0A CN202110752412A CN113350994A CN 113350994 A CN113350994 A CN 113350994A CN 202110752412 A CN202110752412 A CN 202110752412A CN 113350994 A CN113350994 A CN 113350994A
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- B01D53/34—Chemical or biological purification of waste gases
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- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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Abstract
The invention provides a kitchen waste gas treatment method, which belongs to the technical field of environmental protection, and particularly relates to a method for discharging waste gas through a chimney after passing through a primary washing section, a secondary washing section, a biological ecological treatment section, a photocatalytic degradation section, a tertiary washing section, a demisting filtering section and a deep adsorption section in sequence, wherein the method comprises the following steps: the first-stage washing section is a packed tower sprayed with an acidic solution; the secondary washing section is a packed tower sprayed with alkaline solution; the biological ecological treatment section is a biological membrane packed tower, the biological membrane packed tower sequentially consists of a washing humidification section and a biological filter bed section, and the biological filter bed section is filled with filter bed packing loaded by biological membranes; the photocatalytic degradation section is filled with a photocatalyst; the third washing section is a packed tower for water spraying; the invention adopts a combined process to purify the waste gas, simultaneously solves the problems of waste gas oil removal, temperature reduction, dust removal, VOCs removal, odor removal and the like, and has high waste gas purification efficiency and good deodorization effect.
Description
Technical Field
The invention relates to the technical field of environmental protection, in particular to a kitchen waste gas treatment method.
Background
For the odorous waste gas generated in the kitchen and kitchen waste disposal process, the waste gas has complex components, large fluctuation, 25-60 ℃ of temperature, large humidity, little oil smoke and dust and high odor intensity. At present, kitchen and kitchen garbage disposal is in a starting stage, a treatment technology for stink waste gas generated by the kitchen and kitchen garbage disposal is in a research and discussion stage, and a treatment method is mainly used for treating the waste gas through a single spraying, adsorption or microbial process, so that the deodorization effect is unstable, and an ideal effect cannot be achieved.
Disclosure of Invention
Aiming at the problem that the treatment effect of the current single waste gas treatment process is not ideal, the invention provides a treatment method for treating the malodorous waste gas generated in the treatment process of kitchen and kitchen garbage, so that the treated gas can reach the national emission standard.
The purpose of the invention is realized by adopting the following technical scheme:
the kitchen waste gas treatment method comprises the following steps of sequentially passing waste gas through a primary washing section, a secondary washing section, a biological ecological treatment section, a photocatalytic degradation section, a tertiary washing section, a demisting filtering section and a deep adsorption section and then discharging through a chimney, wherein:
the first-stage washing section is a packed tower sprayed with an acidic solution;
the secondary washing section is a packed tower sprayed with alkaline solution;
the biological ecological treatment section is a biological membrane packed tower, the biological membrane packed tower sequentially consists of a washing humidification section and a biological filter bed section, and the biological filter bed section is filled with filter bed packing loaded by biological membranes;
the photocatalytic degradation section is filled with a photocatalyst;
the third washing section is a packed tower sprayed with water.
Preferably, the acidic solution is a sulfuric acid solution, and the alkaline solution is a sodium hydroxide solution.
Preferably, the demisting filtering section uses a combined filler to remove water mist in the gas.
Preferably, the deep adsorption section is filled with an activated carbon adsorbent.
Preferably, the height of the chimney is not less than 15 m.
Preferably, the filter bed filler is a filling modified polyvinyl filler, and the preparation method comprises the following steps:
cleaning edible fungus residues, adding a dilute hydrochloric acid solution with the concentration of 1-10 wt.% to soak for 6-12h, repeatedly washing to be neutral after soaking, drying, placing in an atmosphere box type furnace, heating to 500-550 ℃ at the speed of 3-4 ℃/min under the protective atmosphere, carrying out heat preservation and calcination for 60-90min, adding potassium hydroxide or sodium hydroxide with the same amount as a calcined product after cooling, continuously heating to 800 ℃ in the protective atmosphere of the atmosphere box type furnace, carrying out heat preservation for 3-4h, repeatedly washing to be neutral after cooling, drying and crushing to obtain a product A;
step (2), weighing starch and urea, stirring and dissolving the starch and the urea in deionized water to obtain white viscous liquid, adding an isometric 10 wt.% boric acid solution, stirring, adding sodium chloride crystals with the amount higher than the saturation amount, standing overnight, gradually heating to 1200-1300 ℃ in a protective atmosphere, preserving heat for 1-2h, cooling, crushing and rinsing to obtain a product B;
wherein the mass ratio of the starch to the urea to the deionized water is 10: (2-3): (10-20);
step (3), mixing the product A, the product B and the defatted bone powder according to the mass ratio (1-10): (1-10): 1, mixing to prepare a filling agent; and mixing the filler and the high-density polyethylene in a high-speed mixer in proportion, and carrying out banburying and screw extrusion molding to obtain the polyethylene.
Preferably, the mass ratio of the filler to the high-density polyethylene is 1: (8-10).
Preferably, the extrusion granulation process conditions are as follows: the temperature of the first zone is 150 ℃, the temperature of the second zone is 160 ℃, the temperature of the third zone is 175 ℃, the temperature of the fourth zone is 170 ℃, and the rotating speed of the screw is 25-30 r/min.
Preferably, the preparation method of the photocatalyst comprises the following steps:
s1 preparation of mesoporous carbon nitride
Weighing urea, heating to 550 ℃ at a heating rate of 3-5 ℃/min, carrying out heat preservation and heat treatment for 2 hours to obtain a yellow product, dispersing the yellow product in silica sol, gradually heating to 100 ℃, carrying out heat preservation and stirring for reaction overnight, continuously heating to 550 ℃ at a heating rate of 3-5 ℃/min, carrying out heat preservation and heat treatment for 2-4 hours, cooling to obtain a gray yellow product, adding an ammonium bifluoride solution, stirring overnight, filtering out a precipitate, washing with deionized water and ethanol in sequence until a washing solution is neutral, and carrying out vacuum drying to obtain a product C;
wherein the concentration of the silica sol is 40 wt.%, the average particle size of silica is 12nm, the dispersion ratio of the yellow product to the silica sol is 1g/(5-10ml), the concentration of the ammonium bifluoride solution is 2-3mol/L, and the volume ratio of the ammonium bifluoride solution to the silica sol is 1: (5-25);
s2, load modification
Weighing indium nitrate hexahydrate and sodium stannate trihydrate, dissolving the indium nitrate hexahydrate and the sodium stannate trihydrate in deionized water to prepare a precursor solution, dispersing the product C in the precursor solution, dropwise adding an ammonium vanadate solution under the stirring condition, transferring the solution into a reaction kettle with a polytetrafluoroethylene lining after dropwise adding, carrying out hydrothermal reaction for 8-12h at 180 ℃, cooling to room temperature, filtering out precipitate, washing with absolute ethyl alcohol and distilled water in sequence to be neutral, and carrying out vacuum drying to obtain a product D;
wherein the mass ratio of the indium nitrate hexahydrate to the sodium stannate trihydrate is (1-1.1): 1, the concentration of the precursor solution is 0.05-0.1g/ml, the concentration of the ammonium vanadate solution is 0.4-1.0g/ml, and the mixing volume ratio of the ammonium vanadate solution to the precursor solution is (1-4): 100, respectively;
s3 adsorption modification
And dispersing the product D in 500ml/g of acetonitrile solution of Ru (II) polypyridine complex with the concentration of 0.05-0.1g/ml according to the liquid-to-material ratio of 300-500ml/g to obtain suspension, stirring the suspension under the condition of keeping out of the light overnight, filtering out precipitates, washing the precipitates with acetonitrile and deionized water in sequence, and drying the precipitates in vacuum to obtain the product D.
The invention has the beneficial effects that:
(1) the invention adopts a combined process to purify the waste gas, simultaneously solves the problems of waste gas oil removal, temperature reduction, dust removal, VOCs removal, odor removal and the like, has high waste gas purification efficiency, good deodorization effect, strong impact resistance, stable operation, simple and convenient operation and maintenance, moderate primary investment, low operation cost, no secondary pollution increase, compact equipment, small occupied area and low energy consumption, can stably operate for a long time and reaches the relevant national emission standard; wherein, the front section is respectively pretreated by acid washing and alkali washing, and a differential contact countercurrent spray absorption tower is adopted to ensure that gas-liquid phase reaches 'dead-angle-free' contact, so that fine-particle oily molecules in the waste gas can be condensed and removed, and simultaneously, a good cooling effect is obtained, and VOCs and malodorous components dissolved in water are removed; the biological ecological treatment mainly degrades malodorous gas components through metabolism and reproduction of microbial colonies, and the photocatalytic degradation treatment utilizes active hydroxyl (OH) and other active oxidation substances (O) generated by photocatalytic oxidation2-，·OOH，H2O2) VOCs and malodorous components are degraded under the combined action, and finally, the VOCs are enhanced and adsorbed by adopting active carbon, so that high removal efficiency is ensured.
(2) The filter bed filler is the core of the biomembrane packed tower, and the performance of the filler determines the effect of waste gas treatment. At present, the filter bed filler is generally made of petrochemical materials such as polypropylene, polyethylene, polyvinyl chloride, polyester and the like, and has the characteristics of low polarity, strong hydrophobicity, low surface roughness and the like. In the practical application process, the filler usually has defects in the aspects of film forming speed, film forming amount, water holding capacity and tightness between the film and the filler, and in order to improve the waste gas treatment efficiency, the biocompatibility of the filler needs to be improved so as to improve the film forming property; the invention applies the high-density polyethylene matrix, on the basis of ensuring the mechanical strength of the filler, improves the biocompatibility and the film forming property of the filler through filling modification, and concretely, the edible fungus residue contains rich mycoprotein, various metabolites and nutrient substances which are not fully utilized, has high organic matter content and good biocompatibility; the aerogel not only has the hydrophilic three-dimensional porous characteristic, but also has excellent biocompatibility, good water holding capacity and high specific surface; the defatted bone powder has good biocompatibility and high specific surface, and the invention takes edible fungus dregs as raw materials to obtain a filling agent with good biocompatibility through high-temperature carbonization; the invention also takes common starch as a raw material, forms starch bio-based gel in saturated sodium chloride boric acid solution, and then prepares biomass-based aerogel with three-dimensional porous structure and high specific surface area through high-temperature foaming expansion, and the mixture ratio of the biomass-based aerogel, the degreased bone meal and the carbonized bacterial slag is used as a filling agent, so that the adhesion fastness and the water holding capacity of the filling agent are improved, and the treatment efficiency of the filling agent on waste gas is further improved.
(3) The invention takes carbon nitride nanosheets as raw materials, nano silica sol as a template, and ammonium bifluoride corrodes the silica template to prepare mesoporous carbon nitride covered and combined by the carbon nitride nanosheets, indium tin bi-metal vanadate is generated on the surface of the mesoporous carbon nitride in situ by taking indium nitrate and sodium stannate solution as precursors to form a heterostructure and inhibit the recombination of photoproduction electrons and holes, and meanwhile, the absorption and conversion efficiency of irradiated light is improved by taking a polypyridine complex loaded with ruthenium as a molecular photosensitizer, so that the photocatalysis efficiency is further improved, and the treatment efficiency of waste gas is further improved.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a flow chart of the remediation process described in example 1.
Detailed Description
The invention is further described with reference to the following examples.
The embodiment of the invention relates to a kitchen waste gas treatment method, which specifically comprises the following steps of sequentially passing waste gas through a primary washing section, a secondary washing section, a biological ecological treatment section, a photocatalytic degradation section, a tertiary washing section, a demisting filtering section and a deep adsorption section and then discharging the waste gas through a chimney, wherein the steps of:
the first-stage washing section is a packed tower sprayed with an acidic solution;
the secondary washing section is a packed tower sprayed with alkaline solution;
the biological ecological treatment section is a biological membrane packed tower, the biological membrane packed tower sequentially consists of a washing humidification section and a biological filter bed section, and the biological filter bed section is filled with filter bed packing loaded by biological membranes;
the photocatalytic degradation section is filled with a photocatalyst;
the third washing section is a packed tower for water spraying;
more specifically:
the first step is as follows: collecting the odor waste gas generated in each procedure of kitchen waste disposal through arranging an air suction cover and a regulating valve, and conveying the odor waste gas to a treatment system;
the second step is that: the acid liquor spraying is carried out for pretreatment, the spraying tower is in differential contact countercurrent type, the filler in the tower is a basic component in gas-liquid two-phase contact, the tower can provide enough large surface area, excessive resistance cannot be caused to gas-liquid flow, the absorbent is an acidic medicament (sulfuric acid and the like), the acidic medicament is added into water, the pH value is adjusted to a set value meeting the operation, the absorbent is continuously contacted with waste gas in the filler, and dust particles and alkaline VOCs molecules are purified and removed. Simultaneously, the temperature of the waste gas is reduced;
the third step: alkali liquor spraying is carried out for pretreatment, a spraying tower is in a differential contact countercurrent type, a filler in the tower is a basic component in gas-liquid two-phase contact, the filler can provide a large enough surface area and cannot cause excessive resistance to gas-liquid flow, an absorbent is an alkaline agent (caustic soda and the like), the alkaline agent is added into water, the pH value is adjusted to a set value meeting the operation, the absorbent is continuously contacted with waste gas in the filler, dust particles and acidic VOCs molecules are purified and removed, and meanwhile, the temperature of the waste gas is reduced;
the fourth step: the biomembrane packed tower is sequentially composed of a water washing and humidifying section and a biological filter bed section, waste gas after acid and alkali washing pretreatment enters the water washing section firstly, residual chemical agents in the waste gas are mainly washed and removed, the pH value is adjusted to be neutral, the waste gas is homogenized and enters a biological ecological treatment section, the biological filter bed section is coated with a membrane through filter bed packing, a biomembrane with a certain thickness is formed on the surface of the biological filter bed section, various floras with deodorization capability are fixed, odorous gas passes through a packing space from bottom to top, and the waste gas is intercepted and decomposed; the upper part of the filler is intermittently sprayed with water to ensure the wetting of the filler and provide favorable conditions for biological metabolism and propagation, the waste gas is contacted with a water film on the surface of the filler wetted by the dispersed water to be dissolved, and simultaneously, the waste gas is absorbed, decomposed and utilized by microorganisms inhabiting on the filler, and the three phenomena of oxidation, decomposition and utilization are synchronously carried out, so that H in the waste gas is mainly removed2S、NH3Easily biodegradable waste gas components such as dimethyl sulfide and the like;
the fifth step: after chemical washing and biological purification, the waste gas enters a photocatalytic degradation section, the photocatalytic degradation section adopts a photocatalyst, organic matters can be rapidly and effectively decomposed, the main function is to carry out photocatalytic decomposition on trace VOCs which are not treated at the front section, and the trace VOCs mainly comprise methyl mercaptan, dimethyl sulfide, aldehydes, esters and the like, so as to achieve inorganic and harmless decomposition;
and a sixth step: water spraying post-treatment, wherein a spraying tower is in a differential contact countercurrent type, a filler in the tower is a basic component in gas-liquid two-phase contact, the filler can provide a large enough surface area and cannot cause excessive resistance to gas-liquid flow, an absorbent is an aqueous solution, water is continuously contacted with waste gas in the filler, and the absorbent further absorbs light to catalyze and decompose and then subdivide molecules, free oxygen and the like;
the seventh step: in the water and mist removing section, the waste gas after water spraying, washing and purifying contains water mist, and the water mist is removed through the combined filler, so that the waste gas treatment in the subsequent working section is facilitated;
eighth step: activated carbon adsorption, as a tail end deep guarantee purification working section of the whole treatment process, can further remove residual trace VOCs molecules and peculiar smell molecules of the waste gas treated in the previous working section, the activated carbon adsorption is a measure for effectively removing odor, natural and synthetic dissolved organic matters, micro pollutants and the like, most of larger organic matter molecules, aromatic compounds, halogenated alkynes and the like can be firmly adsorbed on the surface or in gaps of the activated carbon, and the activated carbon adsorption has obvious removal effect on humus, synthetic organic matters and low molecular weight organic matters;
the ninth step: the treated waste gas reaching the standard is led to be high and discharged through a chimney (the height of more than 15 m) by a fan.
Example 1
The utility model provides a kitchen garbage waste gas treatment method, specifically loops through chimney emission behind one-level washing section, second grade washing section, biological ecological treatment section, photocatalytic degradation section, tertiary washing section, defogging filter segment and the deep adsorption section with waste gas, wherein:
the first-stage washing section is a packed tower sprayed with sulfuric acid solution;
the second-stage washing section is a packed tower sprayed with sodium hydroxide;
the biological ecological treatment section is a biological membrane packed tower, the biological membrane packed tower sequentially consists of a washing humidification section and a biological filter bed section, and the biological filter bed section is filled with filter bed packing loaded by biological membranes;
the photocatalytic degradation section is filled with a photocatalyst;
the third washing section is a packed tower for water spraying;
the demisting filtering section removes water mist in the gas by using a combined filler;
the deep adsorption section is filled with an activated carbon adsorbent;
the filter bed filler is a filling modified polyvinyl filler, and the preparation method comprises the following steps:
step 1,
Cleaning edible fungus residues, adding 10 wt.% of dilute hydrochloric acid, soaking for 12h, repeatedly washing to be neutral, drying, placing in an atmosphere box furnace, heating to 500 ℃ in a protective atmosphere, raising the temperature at a rate of 3 ℃/min, carrying out heat preservation and calcination for 1h, cooling, mixing with equivalent potassium hydroxide, continuously heating to 600-800 ℃ in the protective atmosphere of the atmosphere box furnace, carrying out heat preservation for 3h, repeatedly washing to be neutral after cooling, drying and crushing to obtain a product A;
step 2,
Weighing 2g of urea and 5g of starch, fully dissolving the urea and the starch in 10ml of deionized water, adding 10ml of 10 wt.% boric acid solution, stirring, adding 5g of sodium chloride, standing for 4 hours, placing in a high-temperature tube furnace, replacing air in the tube with nitrogen, gradually heating to 1250 ℃, carrying out heat preservation reaction for 1 hour, cooling, crushing and rinsing to obtain a product B;
step 3,
Mixing the product A and the product B with the defatted bone powder according to the mass ratio of 3: 3: 1 is mixed into a filler, and the filler and the high-density polyethylene are mixed according to the mass ratio of 1: 9, mixing, namely adding the mixture into an SJZS-10A miniature conical double-screw extruder for circulating banburying for 5min after mixing for 5min in a high-speed mixer, fully and uniformly mixing, and then extruding and forming by using an SHJ-30 type double-screw extruder to obtain the material, wherein the extrusion process conditions are as follows: the temperature of the first zone is 150 ℃, the temperature of the second zone is 160 ℃, the temperature of the third zone is 175 ℃, the temperature of the fourth zone is 170 ℃, and the rotating speed of the screw is 25-30 r/min.
The structural parameters and the treatment efficiency are shown in the following table, in comparison with unfilled modified polyethylene-based fillers.
Example 2
The utility model provides a kitchen garbage waste gas treatment method, specifically loops through chimney emission behind one-level washing section, second grade washing section, biological ecological treatment section, photocatalytic degradation section, tertiary washing section, defogging filter segment and the deep adsorption section with waste gas, wherein:
the first-stage washing section is a packed tower sprayed with sulfuric acid solution;
the second-stage washing section is a packed tower sprayed with sodium hydroxide;
the biological ecological treatment section is a biological membrane packed tower which consists of a washing humidification section and a biological filter bed section in sequence, the biological filter bed section is filled with filter bed packing loaded by biological membranes,
the photocatalytic degradation section is filled with a photocatalyst;
the third washing section is a packed tower for water spraying;
the demisting filtering section removes water mist in the gas by using a combined filler;
the deep adsorption section is filled with an activated carbon adsorbent;
the preparation method of the photocatalyst comprises the following steps:
s1 preparation of mesoporous carbon nitride
Weighing 5g of urea, heating to 550 ℃, heating at the rate of 3-5 ℃/min, and carrying out heat preservation treatment for 2h to obtain a yellow product; dispersing the yellow product in a silicon dioxide sol according to a dispersion ratio of 1g/10ml, wherein the concentration of the silicon dioxide sol is 40 wt.%, the average particle size of silicon dioxide is 12nm, heating to 100 ℃, stirring for reacting overnight, continuously heating to 550 ℃, heating at a heating rate of 2-3 ℃/min, performing heat preservation and heat treatment for 4h to obtain gray yellow powder, adding the gray yellow powder into a 3mol/L ammonium bifluoride solution, stirring overnight, filtering out precipitates, washing with deionized water and ethanol in sequence until a washing solution is neutral, and performing vacuum drying at 60 ℃;
s2, load modification
Weighing 3.27g of indium nitrate hexahydrate and 3.2g of sodium stannate trihydrate, dissolving the indium nitrate hexahydrate and the sodium stannate trihydrate in 100ml of aqueous solution to prepare a precursor solution, dispersing the product prepared in the step S1 in the precursor solution, adding 3ml of ammonium vanadate solution with the concentration of 0.5g/ml under the stirring condition, fully stirring, transferring the mixture into a reaction kettle with a polytetrafluoroethylene lining, carrying out hydrothermal reaction for 8-12h at 180 ℃, self-cooling to room temperature, filtering out precipitates, sequentially washing the precipitates to be neutral by absolute ethyl alcohol and distilled water, and carrying out vacuum drying at 70 ℃ to constant weight;
s3 adsorption modification
Weighing the product prepared in S2, dispersing the product in 2000ml of acetonitrile solution of terpyridyl chloride hexahydrate with the concentration of 0.07g/ml to obtain suspension, stirring the suspension under the condition of keeping out light overnight, filtering out precipitates, washing the precipitates with acetonitrile and deionized water in sequence, and drying in vacuum to obtain the product.
The method comprises the following steps of (1) comparing graphite-phase carbon nitride serving as a photocatalyst, carrying out a photocatalytic performance test under a xenon lamp, simulating nitrogen oxides in kitchen waste gas by using NO, and simulating VOCs by using formaldehyde, wherein the test result is as follows;
| efficiency of catalytic oxidation | NO(600ppb) | Formaldehyde (250ppm) |
| Example 2 | 64.2％ | 77.4％ |
| Comparative example | 34.3％ | 41.8％ |
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The kitchen waste gas treatment method is characterized in that waste gas is discharged through a chimney after sequentially passing through a primary washing section, a secondary washing section, a biological ecological treatment section, a photocatalytic degradation section, a tertiary washing section, a demisting filtering section and a deep adsorption section, wherein:
the first-stage washing section is a packed tower sprayed with an acidic solution;
the secondary washing section is a packed tower sprayed with alkaline solution;
the biological ecological treatment section is a biological membrane packed tower, the biological membrane packed tower sequentially consists of a washing humidification section and a biological filter bed section, and the biological filter bed section is filled with filter bed packing loaded by biological membranes;
the photocatalytic degradation section is filled with a photocatalyst;
the third washing section is a packed tower sprayed with water.
2. The method for treating the waste gas of the kitchen waste according to claim 1, wherein the acidic solution is a sulfuric acid solution, and the alkaline solution is a sodium hydroxide solution.
3. The method for treating the waste gas of the kitchen waste according to claim 1, wherein the demisting filtering section uses a combined filler to remove water mist in the gas.
4. The method for treating the waste gas of the kitchen waste according to claim 1, wherein the deep adsorption section is filled with an activated carbon adsorbent.
5. The kitchen waste gas treatment method according to claim 1, wherein the height of the chimney is not less than 15 m.
6. The method for treating the waste gas of the kitchen waste according to claim 1, wherein the filter bed filler is a filling modified polyvinyl filler, and the preparation method comprises the following steps:
cleaning edible fungus residues, adding a dilute hydrochloric acid solution with the concentration of 1-10 wt.% to soak for 6-12h, repeatedly washing to be neutral after soaking, drying, placing in an atmosphere box type furnace, heating to 500-550 ℃ at the speed of 3-4 ℃/min under the protective atmosphere, carrying out heat preservation and calcination for 60-90min, adding potassium hydroxide or sodium hydroxide with the same amount as a calcined product after cooling, continuously heating to 800 ℃ in the protective atmosphere of the atmosphere box type furnace, carrying out heat preservation for 3-4h, repeatedly washing to be neutral after cooling, drying and crushing to obtain a product A;
step (2), weighing starch and urea, stirring and dissolving the starch and the urea in deionized water to obtain white viscous liquid, adding an isometric 10 wt.% boric acid solution, stirring, adding sodium chloride crystals with the amount higher than the saturation amount, standing overnight, gradually heating to 1200-1300 ℃ in a protective atmosphere, preserving heat for 1-2h, cooling, crushing and rinsing to obtain a product B;
wherein the mass ratio of the starch to the urea to the deionized water is 10: (2-3): (10-20);
step (3), mixing the product A, the product B and the defatted bone powder according to the mass ratio (1-10): (1-10): 1, mixing to prepare a filling agent; and mixing the filler and the high-density polyethylene in a high-speed mixer in proportion, and carrying out banburying and screw extrusion molding to obtain the polyethylene.
7. The kitchen waste gas treatment method according to claim 6, wherein the mass ratio of the filler to the high-density polyethylene is 1: (8-10).
8. The kitchen waste gas treatment method according to claim 6, wherein the screw extrusion process conditions are as follows: the temperature of the first zone is 150 ℃, the temperature of the second zone is 160 ℃, the temperature of the third zone is 175 ℃, the temperature of the fourth zone is 170 ℃, and the rotating speed of a screw is 25-30 rpm.
9. The kitchen waste gas treatment method according to claim 1, wherein the preparation method of the photocatalyst comprises the following steps:
s1 preparation of mesoporous carbon nitride
Weighing urea, heating to 550 ℃ at a heating rate of 3-5 ℃/min, carrying out heat preservation and heat treatment for 2 hours to obtain a yellow product, dispersing the yellow product in silica sol, gradually heating to 100 ℃, carrying out heat preservation and stirring for reaction overnight, continuously heating to 550 ℃ at a heating rate of 3-5 ℃/min, carrying out heat preservation and heat treatment for 2-4 hours, cooling to obtain a gray yellow product, adding an ammonium bifluoride solution, stirring overnight, filtering out a precipitate, washing with deionized water and ethanol in sequence until a washing solution is neutral, and carrying out vacuum drying to obtain a product C;
wherein the concentration of the silica sol is 40 wt.%, the average particle size of silica is 12nm, the dispersion ratio of the yellow product to the silica sol is 1g/(5-10ml), the concentration of the ammonium bifluoride solution is 2-3mol/L, and the volume ratio of the ammonium bifluoride solution to the silica sol is 1: (5-25);
s2, load modification
Weighing indium nitrate hexahydrate and sodium stannate trihydrate, dissolving the indium nitrate hexahydrate and the sodium stannate trihydrate in deionized water to prepare a precursor solution, dispersing the product C in the precursor solution, dropwise adding an ammonium vanadate solution under the stirring condition, transferring the solution into a reaction kettle with a polytetrafluoroethylene lining after dropwise adding, carrying out hydrothermal reaction for 8-12h at 180 ℃, cooling to room temperature, filtering out precipitate, washing with absolute ethyl alcohol and distilled water in sequence to be neutral, and carrying out vacuum drying to obtain a product D;
wherein the mass ratio of the indium nitrate hexahydrate to the sodium stannate trihydrate is (1-1.1): 1, the concentration of the precursor solution is 0.05-0.1g/ml, the concentration of the ammonium vanadate solution is 0.4-1.0g/ml, and the mixing volume ratio of the ammonium vanadate solution to the precursor solution is (1-4): 100, respectively;
s3 adsorption modification
And dispersing the product D in 500ml/g of acetonitrile solution of Ru (II) polypyridine complex with the concentration of 0.05-0.1g/ml according to the liquid-to-material ratio of 300-500ml/g to obtain suspension, stirring the suspension under the condition of keeping out of the light overnight, filtering out precipitates, washing the precipitates with acetonitrile and deionized water in sequence, and drying the precipitates in vacuum to obtain the product D.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114247429A (en) * | 2021-11-09 | 2022-03-29 | 暨南大学 | Stearic acid derivative organic odor deodorization system |
| CN114522528A (en) * | 2022-02-23 | 2022-05-24 | 苏州华益洁环境能源技术有限公司 | Kitchen waste odor removal process |
| CN115414770A (en) * | 2022-09-15 | 2022-12-02 | 杭州楚环科技股份有限公司 | Garbage waste gas treatment method |
| CN115532002A (en) * | 2022-09-06 | 2022-12-30 | 湖南仁和环境股份有限公司 | Kitchen odor grading and enriching method |
-
2021
- 2021-07-02 CN CN202110752412.0A patent/CN113350994A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114247429A (en) * | 2021-11-09 | 2022-03-29 | 暨南大学 | Stearic acid derivative organic odor deodorization system |
| CN114522528A (en) * | 2022-02-23 | 2022-05-24 | 苏州华益洁环境能源技术有限公司 | Kitchen waste odor removal process |
| CN114522528B (en) * | 2022-02-23 | 2022-12-27 | 苏州华益洁环境能源技术有限公司 | Kitchen waste odor removal process |
| CN115532002A (en) * | 2022-09-06 | 2022-12-30 | 湖南仁和环境股份有限公司 | Kitchen odor grading and enriching method |
| CN115414770A (en) * | 2022-09-15 | 2022-12-02 | 杭州楚环科技股份有限公司 | Garbage waste gas treatment method |
| CN115414770B (en) * | 2022-09-15 | 2023-12-01 | 杭州楚环科技股份有限公司 | Garbage waste gas treatment method |
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Application publication date: 20210907 |