CN112452296A - Biological powder for treating phosphorus-containing wastewater and preparation method thereof - Google Patents
Biological powder for treating phosphorus-containing wastewater and preparation method thereof Download PDFInfo
- Publication number
- CN112452296A CN112452296A CN202011187761.4A CN202011187761A CN112452296A CN 112452296 A CN112452296 A CN 112452296A CN 202011187761 A CN202011187761 A CN 202011187761A CN 112452296 A CN112452296 A CN 112452296A
- Authority
- CN
- China
- Prior art keywords
- phosphorus
- drying
- containing wastewater
- eichhornia crassipes
- biological powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
- B01J20/041—Oxides or hydroxides
-
- 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
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
-
- 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
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- 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 biological powder for treating phosphorus-containing wastewater and a preparation method thereof relate to the treatment of phosphorus-containing wastewater. Cleaning and washing the collected water hyacinth, drying the water hyacinth in an oven after air drying, crushing the biomass dried to constant weight, and screening the crushed biomass by a screen to obtain granular water hyacinth for later use; taking the eichhornia crassipes and a magnesium chloride solution for reaction in a shaking table, taking out, putting the solution in a centrifuge for centrifugal separation, filtering out supernate, drying the supernate in an oven to constant weight, putting the supernate in a quartz boat, introducing nitrogen, heating to a specified temperature, keeping the temperature for a certain time, cooling, taking out, cleaning the burnt biochar with pure water to remove ash, washing until the pH value does not change, and drying and then sieving the biochar with a screen to obtain the biological powder for treating the phosphorus-containing wastewater. The physicochemical properties of the water hyacinth are changed, the specific surface area and the pore volume of the modified material are obviously increased, and the surface of the modified material is loaded with magnesium oxide and magnesium hydroxide, so that the adsorption performance of the material to phosphate is greatly enhanced.
Description
Technical Field
The invention relates to phosphorus-containing wastewater treatment, in particular to biological powder for treating phosphorus-containing wastewater and a preparation method thereof.
Background
As a non-renewable resource, phosphorus plays a crucial role in the circulation of ecosystems. Phosphorus is an important component forming DNA and RNA in a living body, is one of essential elements for plant growth and development, and can increase the yield of products and improve the quality of the products by applying phosphate fertilizer to agricultural and forestry crops. In recent years, however, the world has become increasingly resource-starved. The utilization rate of phosphorus is low, the abuse of phosphate fertilizers is aggravated, and reports show that the utilization rate of phosphate fertilizers of crops in China is only 5% -15%. As shown in the first pollution source census official gazette in China, the total phosphorus discharged in one year in China is about 4.23 multiplied by 105t, wherein the total phosphorus discharged by agricultural activities is 2.85 multiplied by 105t, and accounts for 67% of the national discharge amount. A large amount of untreated phosphorus enters surface water along with the scouring and leaching of agricultural runoff, and when the phosphorus flows together with the lake water body with slow inflow speed and is enriched, the phosphorus becomes one of the original murder inducing the eutrophication of the water body, directly causes the explosive growth of plankton and algae in the water environment, consumes the dissolved oxygen in a water ecological system in a short time, releases toxic substances, reduces the transparency of the water body, and seriously threatens the health of human beings and aquatic organisms. The water hyacinth also can explode intensively in the process, so that the water surface is blocked, the sunlight cannot be injected into the water body, the problem of insufficient dissolved oxygen is further aggravated, and the water quality deterioration degree is enlarged. The possibility of red tide outbreak can be effectively restricted by controlling the concentration of phosphorus in a water body, sewage is treated at the source, and the reduction or the reduction of the total amount of pollutants in the phosphorus-containing wastewater is an important means for treating phosphorus pollution.
The process of treating certain contaminants in water using a particulate material with developed pores as an adsorbent to purify the water is known as an adsorption process. The method comprises the steps of dipping in a proper solution, heating, washing and the like to carry out elution, and can realize the dual purposes of regenerating the adsorbent and recovering the phosphorus resource by utilizing the adsorption-desorption effect. The shortage of phosphorus resources has increasingly become a difficult problem to be solved, and an adsorption method capable of synchronously recycling the phosphate in the wastewater is a hotspot developed by a phosphorus removal process when the phosphate in the wastewater is removed. The agricultural and forestry wastes are used as base materials, and modified biochar is prepared by modifying the agricultural and forestry wastes for adsorption, so that the problem that seasonal wastes are difficult to dispose is solved, practical materials with environmental benefits are created, and the potential of the material is increasingly concerned by research and development personnel.
When water hyacinth explodes in an area, the growth and expansion tendency of the water hyacinth is usually restrained by adopting a salvage method, a huge amount of manpower and material resources are usually consumed for remediation, but a large amount of water hyacinth which is accumulated in a short time cannot be disposed of is also a dilemma encountered in the water hyacinth explosion process, and although some areas have been managed and controlled to use the salvaged water hyacinth as feed or fertilizer, a large amount of unprocessed water hyacinth still has no place to go, so that the water hyacinth is seriously wasted. In recent years, the benefit of preparing biochar from wastes to adsorb pollutants is increasingly noticed by researchers, the eichhornia crassipes is transformed into the adsorbent, the problem of accumulated disposal of the eichhornia crassipes is solved, certain environmental benefit is achieved, the wastes are recycled, practical materials with economic benefit are created, the cost generated in the fishing process can be subsidized, the eichhornia crassipes is a win-win disposal measure, and the potential of using the eichhornia crassipes as a precursor material of the adsorbent is worth deeply digging.
The eichhornia crassipes biochar has the advantages of being good in quality, low in cost, wide in specific surface area, rich in pores, stable in structure and the like, and shows excellent application prospects in the fields of environmental management, soil fertility improvement and climate change alleviation. However, the surface of the fired carbon material usually carries a large amount of negative charges, and the carbon material is easy to generate electrostatic repulsion with negative anions, has small adsorption capacity to phosphate, and is expensive for an adsorption method due to frequent regeneration or replacement of an adsorption material, and the idea of modifying the biochar is developed. In the process of adsorbing the sewage rich in nitrogen and phosphorus by the magnesium modified material, the magnesium modified material can synchronously react with nitrogen and phosphorus to generate struvite crystals besides the electrostatic effect, ion exchange and other reactions of the conventional adsorbent, so that the adsorption capacity of phosphate is further improved. The magnesium-loaded biochar which is saturated in adsorption is rich in nitrogenous fertilizers and phosphate fertilizers, and the struvite is slowly dissolved in the micro-wet environment of soil, can effectively supply nutrients required by crop growth for a long time, and is a high-quality slow-release fertilizer.
Disclosure of Invention
The invention aims to provide biological powder for treating phosphorus-containing wastewater and a preparation method thereof.
The preparation method of the biological powder for treating the phosphorus-containing wastewater comprises the following steps:
1) cleaning and washing the collected water hyacinth to remove impurities and mud water, drying the water hyacinth in a drying oven after air drying in a dry and ventilated place, crushing the biomass dried to constant weight by using a crusher, and screening the crushed biomass by using a screen to obtain granular water hyacinth for later use;
2) taking the eichhornia crassipes to react with a certain amount of magnesium chloride solution in a shaking table for a certain time, taking out the eichhornia crassipes and putting the eichhornia crassipes in a centrifuge for centrifugal separation, filtering supernatant fluid, and drying the eichhornia crassipes in an oven to constant weight;
3) placing the eichhornia crassipes pretreated in the step 2) into a quartz boat, introducing nitrogen, heating to a specified temperature, keeping the temperature constant for a certain time, cooling, taking out, washing the burnt biochar with pure water to remove ash content until the pH value does not change, drying, and screening to obtain biochar in a certain particle size range, thus obtaining the biological powder for treating the phosphorus-containing wastewater.
In step 1), the washing is carried out at least three times; the drying temperature of the drying oven is controlled at 105 ℃, and the drying time is 2 h; the specification of the screen can be 40 meshes, and the granular eichhornia crassipes screened by 40 meshes is stored for later use.
In the step 2), the mass-to-volume ratio of the water hyacinth to the magnesium chloride solution can be 1 g: 9-11 mL, wherein the water hyacinth is calculated by mass, and the magnesium chloride solution is calculated by volume; the magnesium chloride solution can adopt 0.5mol/L magnesium chloride solution; the shaking table is set to react for 1.5-2 h at a shaking speed of 200 r/min; the setting procedure of the centrifugal machine is that the centrifugal machine is centrifuged at the rotating speed of 9000r/min for 25-30 min.
In the step 3), the flow of the introduced nitrogen can be 200mL/min, the temperature control program can be set to a temperature rise speed of 10 ℃/min to 600-650 ℃, and the temperature is kept for 1.5-2 h; the specification of the screen can be 60 meshes of sieve and 80 meshes of sieve, and the biochar with the particle size of 0.180-0.125 mm is screened out.
The invention uses the eichhornia crassipes organism as a biochar substrate material, and prepares biological powder for treating phosphorus-containing wastewater through metal salt soaking modification and tubular furnace high-temperature oxygen-limited firing. The biological powder prepared by the invention has the advantages that the nano-scale granular agglomerates are uniformly distributed on the surface, the surface has a whisker-shaped structure with uniform scattering crystal forms, the fibrous whisker has high strength and good stability, the adsorption time reaches about 24 hours, the adsorption reaction reaches the balance, the balance adsorption capacity is 66.04mg/g, the adsorption performance on phosphate is superior to that of most adsorption materials, and the biological powder can be used for treating phosphorus-containing wastewater.
Compared with the prior art, the invention has the beneficial effects that: the raw material eichhornia crassipes is modified by metal salt, the physical and chemical properties of the material are changed, the specific surface area and the pore volume of the modified material are obviously increased, and the surface of the modified material is loaded with magnesium oxide and magnesium hydroxide, so that the adsorption property of the material to phosphate is greatly enhanced.
Drawings
FIG. 1 is a scanning electron micrograph of the biological powder prepared in example 1 of the present invention.
FIG. 2 is an X-ray diffraction pattern of the biological powder prepared in example 1 of the present invention.
FIG. 3 is a time concentration trend chart of the phosphorus-containing wastewater treated by the biological powder prepared in example 1 of the present invention.
Detailed Description
The following examples will further illustrate the present invention with reference to the accompanying drawings.
Example 1 preparation of magnesium modified eichhornia crassipes biochar:
respectively taking 6g of standby eichhornia crassipes with 60mL of 0.5mol/L magnesium chloride solution to react for 2h in a shaking table at the speed of 200 r/min; taking out, centrifuging for 30min in a centrifuge with a rotation speed of 9000r/min, filtering to remove supernatant, and oven drying at 80 deg.C to constant weight; putting the pretreated eichhornia crassipes into a quartz boat, introducing nitrogen at the gas flow rate of 200mL/min, heating to 600 ℃ at the speed of 10 ℃/min, and keeping the temperature for 2 hours; cooling and taking out, and then washing ash content of the calcined biochar by pure water until the pH value does not change; and (3) drying, sieving with a 60-mesh sieve and a 80-mesh sieve to obtain biochar with the particle size of 0.180-0.125 mm, filling into a weighing bottle, marking, and putting into a dryer for later use, thus obtaining the magnesium modified eichhornia crassipes biochar.
Using an X-ray powder diffractometer model Rigaku Ultima IV, by setting the experimental radiation source toCuKa (lambda is 0.1542nm), set voltage is 40kV, operating current is 30mA, test scanning range is 10-90 DEG, scanning speed is 10 DEG/min, and the prepared material is scanned, and the result is shown in figure 1. As can be seen from fig. 1, the modified material exhibited high-intensity diffraction peaks at 18.5 °, 38.0 °, 50.8 °, 58.7 °, 62.1 °, and the like, respectively, which peaks with mg (oh)2The standard card PDF #44-1482 is basically consistent, and proves that the modification pretreatment successfully loads magnesium on the biochar and forms Mg (OH) with better crystallization degree2. Meanwhile, the peaks of the spectrogram at 42.9 degrees and 62.3 degrees are consistent with the MgO standard card PDF #45-0946, which indicates that magnesium load forms magnesium hydroxide and magnesium oxide crystals at the same time.
The research adopts a Zeiss SUPRA 55 type field emission scanning electron microscope to carry out sample preparation and measurement in a mode of uniformly dispersing the material on the surface of the conductive adhesive. Fig. 2 shows an SEM image of magnesium-modified eichhornia crassipes biochar, and fig. 2(a) shows that many fine pores appear on the surface of an originally smooth material after being pretreated by magnesium chloride impregnation, and the size of the material is below 200nm as seen by a comparative scale, which greatly improves the specific surface area and the pore size. FIG. 2(b) shows that many plate-like aggregates having a length of about 1 μm appear in the biochar layer gap, and the aggregates are consistent with the SEM image of 1 to 2 μm-sized magnesium hydroxide precipitates observed in Wuyufei et al, and are presumed to be Mg (OH)2The precipitate is loaded on the surface of the biochar. (SEM analysis of particle size and microscopic status of Wuyufei, Changfeng, Yang Guying. magnesium hydroxide [ J]Journal of electron microscopy, 2001,04:312-
Fig. 2(c) shows that the biochar surface is uniformly distributed with nano-scale granular agglomerates, which is consistent with the SEM image obtained by observing magnesium modified materials such as leyan, and may be obtained by high-temperature pyrolysis to load magnesium oxide particles on the biochar surface. (Li Yuan, wastewater nitrogen and phosphorus recovery based on magnesium-loaded biomass carbon and research on removal performance of lead and copper in water [ D ]. Zhengzhou university, 2018 ]) FIG. 2(D) shows that a whisker-shaped structure with uniform scattered crystal forms obvious exists on the surface of the biochar, and the whisker-shaped structure possibly exists in one form of magnesium oxide or magnesium hydroxide, is consistent with SEM images observed by Liu vibration and Vega yoga, has high fibrous whisker strength and good stability, and is suitable for being used as a modification additive of materials. (Liuzhen. Sol-gel method preparation of magnesium oxide whiskers from magnesite [ J ]. applied chemical, 2013,9:88-90.) (ghuayu, Hanzhaolong, Xiaozhuolong, etc.. preparation characterization and modification of magnesium hydroxide whiskers [ J ]. inorganic salt industry, 2013,45(9):15-17+34.)
FIG. 3 is a graph showing the change of the adsorption amount of the modified biochar with the adsorption time. As can be seen from FIG. 3, the adsorption rate of magnesium-modified Eichhornia crassipes biochar on phosphate does not change linearly with the increase of the adsorption time. Within 0-8 h of initial adsorption, the adsorption speed of the biochar is high, and the adsorption capacity is rapidly increased to about 80% of the adsorption capacity. Then, in 8-24 h, the adsorption speed is slowed down, and the adsorption quantity is slowly increased along with the advance of time until the saturation is reached. When the adsorption time reaches about 24h, the adsorption reaction reaches the equilibrium, the adsorption quantity is basically not changed along with the increase of the adsorption time length, and the equilibrium adsorption quantity is 66.04 mg/g.
Example 2
Similar to example 1, except that 6g of the leaf portion of Eichhornia crassipes (L.) Craib was taken and reacted with 54mL of 0.5mol/L magnesium chloride solution in a shaker at a speed of 200r/min for 1.5 h.
Example 3
Similar to example 1, except that the shaking table was placed in a centrifuge at 9000r/min for 25min after the reaction.
Example 4
Similar to example 1, except that the pretreated Eichhornia crassipes (mart.) Gaertn was placed in a quartz boat, nitrogen gas was introduced at a gas flow rate of 200mL/min, and the temperature was raised to 650 ℃ at a rate of 10 ℃/min, and the temperature was maintained for 1.5 hours.
In order to more effectively treat the phosphorus-containing wastewater, the invention carries out metal salt modification on the eichhornia crassipes biochar, and the biochar prepared by burning is used for treating the phosphorus-containing wastewater. Test results show that the modified material has good adsorption effect on phosphate, is greatly improved compared with the modified material before modification, and has adsorption capacity superior to that of most adsorption materials.
Claims (10)
1. A preparation method of biological powder for treating phosphorus-containing wastewater is characterized by comprising the following steps:
1) cleaning and washing the collected water hyacinth, drying the water hyacinth in a drying and ventilating place, drying the water hyacinth in an oven, crushing the biomass dried to constant weight by using a crusher, screening the crushed biomass by using a screen, and taking the granular water hyacinth for storage and later use;
2) taking the eichhornia crassipes to react with a certain amount of magnesium chloride solution in a shaking table for a certain time, taking out the eichhornia crassipes and putting the eichhornia crassipes in a centrifuge for centrifugal separation, filtering supernatant fluid, and drying the eichhornia crassipes in an oven to constant weight;
3) placing the eichhornia crassipes pretreated in the step 2) into a quartz boat, introducing nitrogen, heating to a specified temperature, keeping the temperature constant for a certain time, cooling, taking out, washing the burnt biochar with pure water to remove ash content until the pH value does not change, drying, and screening to obtain biochar in a certain particle size range, thus obtaining the biological powder for treating the phosphorus-containing wastewater.
2. The method of claim 1, wherein in step 1), the cleaning is performed at least three times to remove impurities and sludge water.
3. The method for preparing biological powder for treating phosphorus-containing wastewater as claimed in claim 1, wherein in step 1), the drying temperature is controlled at 105 ℃ and the drying time is 2 h.
4. The method of claim 1, wherein in step 1), the size of the screen is 40 meshes, and the granulated eichhornia crassipes screened by 40 meshes is stored for later use.
5. The method of claim 1, wherein in step 2), the mass-to-volume ratio of eichhornia crassipes to magnesium chloride solution is 1 g: 9-11 mL, wherein eichhornia crassipes is calculated by mass and magnesium chloride solution is calculated by volume; the magnesium chloride solution is 0.5mol/L magnesium chloride solution.
6. The method according to claim 1, wherein in the step 2), the shaking table is set to have a shaking speed of 200r/min for 1.5-2 h.
7. The method for preparing biological powder for treating phosphorus-containing wastewater according to claim 1, wherein in the step 2), the centrifuge is set to rotate at 9000r/min for 25-30 min.
8. The method according to claim 1, wherein in step 3), the nitrogen gas is introduced at a flow rate of 200mL/min, the temperature control program is set to a temperature rise rate of 10 ℃/min to 600-650 ℃, and the temperature is maintained for 1.5-2 h.
9. The method for preparing biological powder for treating phosphorus-containing wastewater according to claim 1, wherein in the step 2), the size of the screen is 60-80 meshes, and biochar with the particle size of 0.180-0.125 mm is screened out.
10. The biological powder prepared by the method for preparing the biological powder for treating the phosphorus-containing wastewater as claimed in claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011187761.4A CN112452296A (en) | 2020-10-30 | 2020-10-30 | Biological powder for treating phosphorus-containing wastewater and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011187761.4A CN112452296A (en) | 2020-10-30 | 2020-10-30 | Biological powder for treating phosphorus-containing wastewater and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112452296A true CN112452296A (en) | 2021-03-09 |
Family
ID=74835608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011187761.4A Pending CN112452296A (en) | 2020-10-30 | 2020-10-30 | Biological powder for treating phosphorus-containing wastewater and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112452296A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2005109256A (en) * | 2005-03-31 | 2006-09-10 | лин Сергей Владимирович Л (RU) | METHOD FOR HYDROBOTANICAL CLEANING OF POLLUTED WATER MEDIA UNDER CLIMATE CONDITIONS OF MIDDLE LATITUDES |
| CN104628137A (en) * | 2014-12-29 | 2015-05-20 | 南京大学 | Method for treating phosphatic sewage by coupling modified biomass charcoal and artificial wetland |
| CN105879834A (en) * | 2014-10-21 | 2016-08-24 | 王欣 | Preparation method of adsorbent for removing phosphorus and heavy metal anions in water as well as application method |
| CN108786738A (en) * | 2018-07-03 | 2018-11-13 | 西北农林科技大学 | A kind of magnesium salts modification biological charcoal and its application |
| CN109092247A (en) * | 2018-09-09 | 2018-12-28 | 桂林理工大学 | The preparation method of modified mulberry bar biomass carbon adsorbent |
| CN109158080A (en) * | 2018-09-15 | 2019-01-08 | 天津大学 | A kind of magnesium for recycling nitrogen P elements in urine changes the preparation method of charcoal |
| CN109621895A (en) * | 2018-12-21 | 2019-04-16 | 安徽汇泽通环境技术有限公司 | A method of Water phosphorus is removed using modified water plant charcoal |
| CN110270310A (en) * | 2019-07-25 | 2019-09-24 | 安徽农业大学 | A kind of synchronous high-efficiency recycles the preparation method and applications of the rich magnesium charcoal of nitrogen and phosphorus nutrient in farm's waste liquid |
-
2020
- 2020-10-30 CN CN202011187761.4A patent/CN112452296A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2005109256A (en) * | 2005-03-31 | 2006-09-10 | лин Сергей Владимирович Л (RU) | METHOD FOR HYDROBOTANICAL CLEANING OF POLLUTED WATER MEDIA UNDER CLIMATE CONDITIONS OF MIDDLE LATITUDES |
| CN105879834A (en) * | 2014-10-21 | 2016-08-24 | 王欣 | Preparation method of adsorbent for removing phosphorus and heavy metal anions in water as well as application method |
| CN104628137A (en) * | 2014-12-29 | 2015-05-20 | 南京大学 | Method for treating phosphatic sewage by coupling modified biomass charcoal and artificial wetland |
| CN108786738A (en) * | 2018-07-03 | 2018-11-13 | 西北农林科技大学 | A kind of magnesium salts modification biological charcoal and its application |
| CN109092247A (en) * | 2018-09-09 | 2018-12-28 | 桂林理工大学 | The preparation method of modified mulberry bar biomass carbon adsorbent |
| CN109158080A (en) * | 2018-09-15 | 2019-01-08 | 天津大学 | A kind of magnesium for recycling nitrogen P elements in urine changes the preparation method of charcoal |
| CN109621895A (en) * | 2018-12-21 | 2019-04-16 | 安徽汇泽通环境技术有限公司 | A method of Water phosphorus is removed using modified water plant charcoal |
| CN110270310A (en) * | 2019-07-25 | 2019-09-24 | 安徽农业大学 | A kind of synchronous high-efficiency recycles the preparation method and applications of the rich magnesium charcoal of nitrogen and phosphorus nutrient in farm's waste liquid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110270310B (en) | Preparation method and application of magnesium-rich biochar for synchronously and efficiently recovering nitrogen and phosphorus nutrients in waste liquid of farm | |
| CN109603749B (en) | Preparation method and application of modified straw stalk biochar | |
| CN110652963A (en) | Lanthanum carbonate modified co-pyrolysis sludge biochar and preparation method and application thereof | |
| CN108144581B (en) | Alkali modified pig manure biochar and preparation method and application thereof | |
| CN110756166A (en) | Corncob-loaded magnesium-modified adsorption material and preparation method and application thereof | |
| CN108927109B (en) | Method for modifying biochar by using phosphogypsum and application of biochar | |
| CN111732147B (en) | Method for treating phosphate in water body by using Bi-MOF-polymer compound | |
| CN111807453A (en) | Modified biochar for adsorbing phosphorus in water body and preparation method and application thereof | |
| CN110142032B (en) | Chitosan biochar composite material and preparation method and application thereof | |
| CN110899317A (en) | Cadmium-polluted farmland soil remediation method based on magnetic biochar | |
| CN112619600A (en) | Method for preparing modified biochar by utilizing plant wastes and application | |
| CN109173999A (en) | A kind of preparation method and applications of biology carbon microspheres | |
| CN109569525A (en) | A kind of preparation of amido modified magnetic rice husk charcoal and method using uranium in its adsorbed water body | |
| CN111302340A (en) | Preparation method of biogas residue biochar | |
| CN108187623A (en) | A kind of preparation method for effectively removing the green composite Nano magnetic material of heavy metal in environment | |
| CN106311148B (en) | A kind of charcoal composite material and preparation method | |
| CN113171750B (en) | Method for preparing biochar from bottom mud and garden garbage and application of biochar | |
| CN113044837B (en) | Magnetic phosphoric acid activated bamboo charcoal composite material and preparation process thereof | |
| CN112774625B (en) | Zirconia doped magnetic high-surface-activity carbon composite material, preparation method and application | |
| CN112452296A (en) | Biological powder for treating phosphorus-containing wastewater and preparation method thereof | |
| CN115672276A (en) | Method for enhancing copper ion adsorption of biochar by utilizing magnesium chloride modification | |
| CN108529620A (en) | Orange peel sludge composite based activated carbon and the preparation method and application thereof | |
| CN114618433A (en) | Magnesium modified cow dung biochar and preparation method and application thereof | |
| CN109382073B (en) | Preparation method and application of alkali fusion fly ash modified pig manure biochar | |
| CN112808236A (en) | Ecological treatment and resource utilization method for lake polluted bottom sludge and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210309 |