CN111672467A - Phosphorus-absorbing biochar prepared by co-pyrolysis of kitchen waste bones and organic solid wastes - Google Patents
Phosphorus-absorbing biochar prepared by co-pyrolysis of kitchen waste bones and organic solid wastes Download PDFInfo
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- CN111672467A CN111672467A CN202010515711.8A CN202010515711A CN111672467A CN 111672467 A CN111672467 A CN 111672467A CN 202010515711 A CN202010515711 A CN 202010515711A CN 111672467 A CN111672467 A CN 111672467A
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- organic solid
- phosphorus
- biochar
- bones
- kitchen waste
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- 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
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
-
- 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
- B01J2220/00—Aspects relating to sorbent materials
- B01J2220/40—Aspects relating to the composition of sorbent or filter aid materials
- B01J2220/48—Sorbents characterised by the starting material used for their preparation
- B01J2220/4875—Sorbents characterised by the starting material used for their preparation the starting material being a waste, residue or of undefined composition
- B01J2220/4887—Residues, wastes, e.g. garbage, municipal or industrial sludges, compost, animal manure; fly-ashes
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
Abstract
A phosphorus absorption biochar prepared by co-pyrolysis of kitchen waste bones and organic solid waste is obtained by the following method: step 1: respectively drying and crushing the organic solid wastes and the kitchen waste bones, and mixing the organic solid wastes and the kitchen waste bones into organic solid waste mixed powder according to the proportion that the mass of the organic solid wastes is greater than that of the kitchen waste bones; step 2: and (3) pyrolyzing the organic solid mixed powder obtained in the step (1) in a nitrogen atmosphere to obtain phosphorus-absorbing biochar, and cooling to room temperature in the nitrogen atmosphere. The invention also discloses a preparation method of the phosphorus-absorbing biochar and application of the phosphorus-absorbing biochar in adsorbing phosphorus in wastewater.
Description
Technical Field
The invention belongs to the technical field of organic solid waste recycling, and particularly relates to phosphorus-absorbing biochar prepared by co-pyrolysis of kitchen waste bones and organic solid waste.
The invention also relates to a method for preparing the phosphorus-absorbing biochar.
The invention also relates to application of the phosphorus-absorbing biochar.
Background
The annual output of organic solid wastes such as human living sources, agricultural sources, industrial sources and the like is high, and the reduction and resource utilization of the organic solid wastes can be realized by preparing the biochar through high-temperature pyrolysis. The biochar is an excellent material for adsorbing phosphorus in wastewater, and particularly, the biochar doped with calcium has the characteristic of efficiently adsorbing phosphorus. The traditional method for preparing the calcium-doped biochar material as biochar impregnated calcium salt needs to additionally add calcium salt solution, and the preparation process is complex.
With the improvement of living standard of people, the rapid development of the catering industry brings about the increase of meat bones of kitchen garbage such as pigs, chickens and ducks, and the implementation of a household garbage classification system puts higher requirements on rear-end garbage disposal. The kitchen waste bone contains a large amount of calcium elements, part of the bone is hard, the bone is difficult to degrade by adopting biological treatment modes such as composting or anaerobic fermentation, the calcium elements are difficult to recycle, and the reduction and resource utilization efficiency is low.
Disclosure of Invention
The invention aims to provide phosphorus absorption biochar prepared by co-pyrolysis of kitchen waste bones and organic solid waste.
Still another object of the present invention is to provide a method for preparing the above phosphorus-adsorbing biochar.
In order to achieve the purpose, the phosphorus absorption biochar prepared by co-pyrolysis of kitchen waste bones and organic solid waste is obtained by the following method:
step 1: respectively drying and crushing the organic solid wastes and the kitchen waste bones, and mixing the organic solid wastes and the kitchen waste bones into organic solid waste mixed powder according to the proportion that the mass of the organic solid wastes is greater than that of the kitchen waste bones;
step 2: and (3) pyrolyzing the organic solid mixed powder obtained in the step (1) in a nitrogen atmosphere to obtain biochar, and cooling to room temperature in the nitrogen atmosphere to obtain phosphorus-absorbing biochar.
The method for preparing the phosphorus-absorbing biochar provided by the invention comprises the following steps:
step 1: respectively drying and crushing the organic solid wastes and the kitchen waste bones, and mixing the organic solid wastes and the kitchen waste bones into organic solid waste mixed powder according to the proportion that the mass of the organic solid wastes is greater than that of the kitchen waste bones;
step 2: and (3) pyrolyzing the organic solid mixed powder obtained in the step (1) in a nitrogen atmosphere to obtain biochar, and cooling to room temperature in the nitrogen atmosphere to obtain phosphorus-absorbing biochar.
In the method, the mixing mass ratio of the kitchen waste bones to the organic solid waste in the step 1 is 10-100:1, preferably 40: 1.
In the method, the organic solid waste in the step 1 is straw, sludge, livestock and poultry manure, anaerobic digestion biogas residue and the like, and the kitchen waste bone is the residual poultry bone, fish bone and the like in the food.
In the method, the drying temperature of the organic solid wastes and the kitchen garbage bones in the step 1 is 60-80 ℃, and the drying time is 24 hours.
In the method, the step 2 is pyrolysis in a tubular furnace, the heating rate is 5-10 ℃/min, and the pyrolysis temperature is 800-1100 ℃.
The phosphorus-absorbing biochar disclosed by the invention is applied to adsorbing phosphorus in a solution in phosphorus-containing wastewater.
In the application, the dosage of the phosphorus absorption biochar in the phosphorus-containing wastewater is 0.1-2.0 g/L.
In the application, the phosphorus-containing wastewater comprises biogas slurry, domestic sewage, electroplating sewage and the like.
The invention has the beneficial effects that:
according to the invention, a large amount of calcium element contained in the kitchen waste bone is fully utilized, and the kitchen waste bone and the organic solid waste are pyrolyzed in a synergistic manner to load calcium on the biochar to prepare the biochar capable of efficiently adsorbing phosphorus, so that the treatment of waste by waste is realized, the reduction and resource utilization of the organic solid waste are realized, a high-value utilization way of the kitchen waste bone and the organic solid waste is developed, and the method has an important guiding significance on production practice. The invention has the characteristics of rich raw materials, low manufacturing cost, more adsorption sites, large adsorption capacity, no secondary pollution and the like, and can be used for treating the phosphorus-containing wastewater.
Detailed Description
In order to solve the problem of the rear end setting efficiency of the classification of the household garbage and realize the reduction and resource utilization of organic solid waste and kitchen waste bones, the invention provides a method for preparing high-efficiency phosphorus-absorbing biochar by co-pyrolysis of the kitchen waste bones, which fully utilizes a large amount of Ca elements contained in the bones and is co-pyrolyzed with organic solid waste at high temperature to prepare Ca-doped high-efficiency phosphorus-absorbing biochar.
The technical scheme of the invention is as follows:
step 1: drying organic solid waste and kitchen waste bone respectively, pulverizing, sieving with 2mm sieve, drying at 60-80 deg.C (preferably 80 deg.C), and drying for 24 hr. The organic solid waste powder and the bone powder are fully mixed according to a certain proportion, and the principle of the mixing proportion is that the mass of the organic solid waste is larger than that of the bone of the kitchen waste. In one embodiment, the mixing mass ratio of the organic solid waste to the kitchen waste bone is 10-100:1 (preferably 40: 1). The organic solid waste is straw, sludge, livestock and poultry manure, anaerobic digestion biogas residue and other organic wastes, preferably biogas residue and straw, and the kitchen waste bone is the bone, fish bone and the like of poultry such as chicken, duck and the like remaining in food.
Step 2: and (3) pyrolyzing the solid mixed powder obtained in the step (1) in a tubular furnace at high temperature in the nitrogen atmosphere to obtain the phosphorus-absorbing biochar. Wherein the heating rate is 5-10 ℃/min (preferably 10 ℃/min), the pyrolysis temperature is 800-.
The phosphorus-absorbing biochar obtained by the invention is added into phosphorus-containing wastewater according to a certain proportion, the dosage of the phosphorus-absorbing biochar in the wastewater is 0.1-2.0g/L (preferably 0.5g/L), and the phosphorus in the wastewater is absorbed. The phosphorus-containing wastewater comprises biogas slurry, domestic sewage, electroplating sewage and the like, and the biogas slurry and the domestic sewage are preferably selected.
In order to make the technical solutions and advantages of the present invention clearer, the following is described in further detail with reference to examples, but the examples are not intended to limit the present invention.
Example 1:
(1) organic waste and bone pretreatment: the chicken bone is taken from kitchen garbage of a teacher's canteen of China environmental science research institute, the organic solid waste straw is taken from a test base of China environmental science research institute in the area of the cisternate of Beijing city, the chicken bone and the organic solid waste straw are all washed clean by clean water, naturally dried for 48 hours and then crushed to be less than 2mm by a crusher, and 2.5g of bone powder and 100g of straw powder are fully mixed.
(2) Preparing the phosphorus-absorbing biochar: and (2) putting the mixed powder in the step (1) into a drying oven at 80 ℃ for 24h, then carrying out high-temperature pyrolysis in a nitrogen environment, keeping the pyrolysis final temperature at 800 ℃ at a heating rate of 10 ℃/min for 2h, and cooling to room temperature under nitrogen to obtain the phosphorus-absorbing biochar BCG prepared by co-pyrolysis of straws and chicken bones.
(3) And (3) preparing the straws in the step (1) into powder, and repeating the step (2) to obtain the pure straw biochar BCJ.
(4) Adsorbing phosphorus: and (2) taking 1000mL of phosphate wastewater solution with the initial concentration of 100mg/L, respectively adding the phosphorus-absorbing biochar BCG in the step (2) and the pure straw biochar BCJ in the step (3) with the dosage of 0.5g, carrying out oscillation adsorption reaction in a water bath constant-temperature oscillator at 25 ℃, filtering after 24 hours to separate the biochar from the aqueous solution, and measuring the content of phosphate in the aqueous solution by using an ammonium molybdate-ascorbic acid colorimetric method, wherein the adsorption capacity of the phosphorus-absorbing biochar BCG is 45.15mg/g, and the adsorption capacity of the pure straw biochar BCJ is 17.5 mg/g.
The result shows that the phosphorus adsorption content of the phosphorus adsorption biochar added with the chicken bone for co-pyrolysis treatment is increased by 158 percent, and the phosphorus adsorption biochar is a high-efficiency phosphorus adsorption material.
Example 2:
(1) organic waste and meat and bone pretreatment: the fish bone is taken from kitchen waste of a certain seafood restaurant in Beijing, the organic solid waste sludge is taken from residual sludge of a certain sewage treatment plant in Beijing, the fish bone is naturally dried for 48 hours and then crushed to be less than 2mm by a crusher, and 5g of fish bone powder and 100g of sludge powder are fully mixed.
(2) Preparing the phosphorus-absorbing biochar: and (2) putting the mixed powder in the step (1) into a drying oven at 80 ℃ for 24h, then carrying out high-temperature pyrolysis in a nitrogen environment, keeping the pyrolysis final temperature at 1000 ℃ at a heating rate of 8 ℃/min for 2h, and cooling to room temperature under nitrogen to obtain the phosphorus-absorbing biochar BCG prepared by co-pyrolysis of sludge and fish bones.
(3) And (3) taking the excess sludge of a certain sewage treatment plant in Beijing in the step 1, and repeating the step 2 to obtain the pure sludge biochar BCW.
(4) Adsorbing phosphorus: and (2) taking 1000mL of biogas slurry with the initial phosphate concentration of 50mg/L, respectively adding 1g of phosphorus-absorbing biochar BCG obtained in the step (2) and 1g of pure sludge biochar BCW obtained in the step (3), carrying out oscillation adsorption reaction in a water bath constant-temperature oscillator at the temperature of 20 ℃, filtering after 24 hours to separate biochar from the aqueous solution, measuring the content of phosphate in the aqueous solution by using an ammonium molybdate-ascorbic acid colorimetric method, wherein the removal rate of the phosphate of the added phosphorus-absorbing biochar BCG is 92.1%, and the removal rate of the BCW added with the pure sludge biochar is 48.8%.
The result shows that the efficiency of the straw biochar for adsorbing the content of phosphorus is improved by adding the chicken bones for co-pyrolysis treatment, and the straw biochar is an efficient phosphorus adsorbing material.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A phosphorus absorption biochar prepared by co-pyrolysis of kitchen waste bones and organic solid waste is obtained by the following method:
step 1: respectively drying and crushing the organic solid wastes and the kitchen waste bones, and mixing the organic solid wastes and the kitchen waste bones into organic solid waste mixed powder according to the proportion that the mass of the organic solid wastes is greater than that of the kitchen waste bones;
step 2: and (3) pyrolyzing the organic solid mixed powder obtained in the step (1) in a nitrogen atmosphere to obtain phosphorus-absorbing biochar, and cooling to room temperature in the nitrogen atmosphere.
2. A method for preparing the phosphorus-adsorbing biochar of claim 1, comprising the steps of:
step 1: respectively drying and crushing the organic solid wastes and the kitchen waste bones, and mixing the organic solid wastes and the kitchen waste bones into organic solid waste mixed powder according to the proportion that the mass of the organic solid wastes is greater than that of the kitchen waste bones;
step 2: and (3) pyrolyzing the organic solid mixed powder obtained in the step (1) in a nitrogen atmosphere to obtain phosphorus-absorbing biochar, and cooling to room temperature in the nitrogen atmosphere.
3. The method of claim 2, wherein the mixing mass ratio of the organic solid wastes to the bones of the kitchen wastes in the step 1 is 10-100: 1.
4. The method of claim 3, wherein the mixing mass ratio of the organic solid waste to the kitchen waste bone in step 1 is 40: 1.
5. The method as claimed in claim 2, wherein the organic solid waste in step 1 is straw, sludge, livestock and poultry manure, anaerobic digestion biogas residue, and the kitchen waste bone is the bone of poultry and fish bone remaining in food.
6. The method as claimed in claim 2, wherein the drying temperature of the organic solid wastes and the bones of the kitchen wastes in the step 1 is 60-80 ℃ and the drying time is 24 hours.
7. The method as claimed in claim 2, wherein the step 2 comprises pyrolysis in a tube furnace at a temperature rise rate of 5-10 ℃/min and a pyrolysis temperature of 800-.
8. The use of the phosphorus adsorbing biochar of claim 1 in adsorbing phosphorus in solution in phosphorus-containing wastewater.
9. The use of claim 8, wherein the phosphorus-adsorbing biochar is used in the phosphorus-containing wastewater at a dosage of 0.1-2.0 g/L.
10. The application of claim 8, wherein the phosphorus-containing wastewater comprises biogas slurry, domestic sewage and electroplating sewage.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112647091A (en) * | 2020-12-09 | 2021-04-13 | 中国科学院广州能源研究所 | N/P/Ca in-situ doped biochar and application thereof in electrolysis of water for hydrogen evolution |
| CN112694146A (en) * | 2021-01-05 | 2021-04-23 | 上海万狮环保科技有限公司 | Efficient composite phosphorus removal agent, preparation method and application |
| CN113797891A (en) * | 2020-12-11 | 2021-12-17 | 北京大学深圳研究生院 | Biogas residue-based biochar material and preparation method and application thereof |
| CN114259985A (en) * | 2021-12-21 | 2022-04-01 | 中州水务控股有限公司 | Method for preparing biochar by using kitchen waste as biomass |
| CN115180786A (en) * | 2022-08-05 | 2022-10-14 | 南方海洋科学与工程广东省实验室(广州) | Method for fixing sludge heavy metals by natural calcium-based biochar |
| CN116984355A (en) * | 2023-07-27 | 2023-11-03 | 昆明理工大学 | Method for preparing biochar from solid waste, product and application |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112647091A (en) * | 2020-12-09 | 2021-04-13 | 中国科学院广州能源研究所 | N/P/Ca in-situ doped biochar and application thereof in electrolysis of water for hydrogen evolution |
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| CN113797891B (en) * | 2020-12-11 | 2024-01-02 | 北京大学深圳研究生院 | Biogas residue-based biochar material and preparation method and application thereof |
| CN112694146A (en) * | 2021-01-05 | 2021-04-23 | 上海万狮环保科技有限公司 | Efficient composite phosphorus removal agent, preparation method and application |
| CN114259985A (en) * | 2021-12-21 | 2022-04-01 | 中州水务控股有限公司 | Method for preparing biochar by using kitchen waste as biomass |
| CN115180786A (en) * | 2022-08-05 | 2022-10-14 | 南方海洋科学与工程广东省实验室(广州) | Method for fixing sludge heavy metals by natural calcium-based biochar |
| CN115180786B (en) * | 2022-08-05 | 2024-02-20 | 南方海洋科学与工程广东省实验室(广州) | Method for fixing sludge heavy metals by natural calcium-based biochar |
| CN116984355A (en) * | 2023-07-27 | 2023-11-03 | 昆明理工大学 | Method for preparing biochar from solid waste, product and application |
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Application publication date: 20200918 |