CN114832774A - Method for recovering phosphorus from domestic sewage biological treatment system and directly recycling phosphorus - Google Patents
Method for recovering phosphorus from domestic sewage biological treatment system and directly recycling phosphorus Download PDFInfo
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- CN114832774A CN114832774A CN202210361944.6A CN202210361944A CN114832774A CN 114832774 A CN114832774 A CN 114832774A CN 202210361944 A CN202210361944 A CN 202210361944A CN 114832774 A CN114832774 A CN 114832774A
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 68
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 68
- 239000011574 phosphorus Substances 0.000 title claims abstract description 68
- 239000010865 sewage Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000004064 recycling Methods 0.000 title claims abstract description 10
- 239000003610 charcoal Substances 0.000 claims abstract description 24
- 239000010902 straw Substances 0.000 claims abstract description 24
- 239000002028 Biomass Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 19
- 239000002699 waste material Substances 0.000 claims abstract description 18
- 239000002689 soil Substances 0.000 claims abstract description 14
- 230000008635 plant growth Effects 0.000 claims abstract description 4
- 230000001737 promoting effect Effects 0.000 claims abstract description 3
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 12
- 238000003763 carbonization Methods 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 9
- 238000007598 dipping method Methods 0.000 claims description 8
- 239000011592 zinc chloride Substances 0.000 claims description 8
- 235000005074 zinc chloride Nutrition 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 4
- 239000002154 agricultural waste Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 235000017060 Arachis glabrata Nutrition 0.000 claims description 2
- 244000105624 Arachis hypogaea Species 0.000 claims description 2
- 235000010777 Arachis hypogaea Nutrition 0.000 claims description 2
- 235000018262 Arachis monticola Nutrition 0.000 claims description 2
- 241000233866 Fungi Species 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims description 2
- 235000007164 Oryza sativa Nutrition 0.000 claims description 2
- 238000010000 carbonizing Methods 0.000 claims description 2
- 235000013339 cereals Nutrition 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 235000020232 peanut Nutrition 0.000 claims description 2
- 235000009566 rice Nutrition 0.000 claims description 2
- 238000004062 sedimentation Methods 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 7
- 239000002994 raw material Substances 0.000 abstract description 3
- 230000035558 fertility Effects 0.000 abstract description 2
- 238000011268 retreatment Methods 0.000 abstract 1
- 240000008042 Zea mays Species 0.000 description 18
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 18
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 18
- 235000005822 corn Nutrition 0.000 description 18
- 239000000843 powder Substances 0.000 description 5
- 241000196324 Embryophyta Species 0.000 description 4
- 239000003575 carbonaceous material Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000012010 growth Effects 0.000 description 4
- 239000002367 phosphate rock Substances 0.000 description 4
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 4
- 244000221633 Brassica rapa subsp chinensis Species 0.000 description 3
- 241000219823 Medicago Species 0.000 description 3
- 235000017587 Medicago sativa ssp. sativa Nutrition 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- 235000010149 Brassica rapa subsp chinensis Nutrition 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000005470 impregnation Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000001994 activation Methods 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000012258 culturing Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000035764 nutrition Effects 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 239000003516 soil conditioner Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000004227 thermal cracking Methods 0.000 description 1
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
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
Abstract
The invention discloses a method for recovering phosphorus from a domestic sewage biological treatment system and directly recycling the phosphorus, and belongs to the technical field of domestic sewage recycling. The invention takes the agricultural and forestry waste as the raw material, the agricultural and forestry waste is cleaned, dried, crushed, screened, dipped and modified, and then carbonized at high temperature to form the biomass charcoal material with high phosphorus adsorption performance, and then the biomass charcoal material is added into the biological treatment system of urban domestic sewage to form the phosphorus-rich biomass charcoal material, and the material can be mixed with soil without any retreatment, thereby improving the soil fertility and promoting the plant growth. The method can recover phosphorus from domestic sewage, is directly applied to soil, can slow down the trend of increasing shortage of phosphorus resources, changes agricultural and forestry wastes into valuables, realizes sustainable resource utilization, has low cost and no pollution, avoids pollution caused by burning the agricultural and forestry wastes such as straws and the like, improves the utilization value of the agricultural and forestry wastes, and has wide application prospect.
Description
Technical Field
The invention belongs to the technical field of domestic sewage recycling and agricultural and forestry solid waste recycling, and particularly relates to a method for recovering phosphorus from a domestic sewage biological treatment system and a direct recycling method of a product obtained by recovering phosphorus.
Background
Phosphorus (P) is one of the non-metal mineral resources which are very important and difficult to regenerate on the earth, is a nutrient element which is necessary for the growth and reproduction of all organisms, and is also a limited and non-renewable resource. Although the reserves of the high-grade phosphorite in China are 33 hundred million tons at present and are the second place in the world, the reserves of the high-grade phosphorite resources in China are low, the annual exploitation amount is large, and the high-quality phosphorite in China is exhausted in less than 20 years due to the low efficiency of the phosphorite and the non-cyclic utilization of the agricultural industry. The phosphorus crisis is imminent, and has become one of the major crises that human society must face today.
The huge yield of domestic sewage containing soluble phosphorus, and the recovery of phosphorus from domestic sewage instead of removal along with the generation of phosphorus crisis, are becoming more and more the focus of attention. However, the existing domestic sewage biological treatment process still removes phosphorus, and phosphorus in the sewage is transferred from liquid to solid and is discarded, so that the phosphorus cannot be recovered and recycled. The method is one of effective ways for relieving the shortage of phosphorus resources by recovering phosphorus from domestic sewage and utilizing the phosphorus fertilizer by land so as to realize quick resource utilization.
China is a big country for agriculture and forestry and is also one of the countries with abundant agricultural and forestry wastes. Taking straws as an example, the theoretical resource amount of the straws of the crops in the whole country in 2015 is 10.4 hundred million tons, the collectable resource amount is about 9 hundred million tons, and the utilization amount is about 7.2 hundred million tons. However, the comprehensive utilization of straws has low industrialization degree, poor economic benefit and higher cost, so that the straws are mainly used for direct combustion or incineration waste in China at present. The thermal cracking of agricultural and forestry waste materials such as straws and the like under the oxygen-free or oxygen-limited condition to prepare the carbon material with characteristics of looseness, porosity, large specific surface area and specific adsorption performance becomes a research hotspot in the current environmental science field.
Disclosure of Invention
Aiming at the problems which need to be solved urgently, a method for recovering phosphorus from a domestic sewage biological treatment system and directly recycling the phosphorus is provided.
In order to realize the technical problem, the invention adopts the following technical scheme:
the invention aims to provide a method for recovering phosphorus from a domestic sewage biological treatment system, which comprises the following steps:
cleaning, drying and crushing the agricultural and forestry waste;
secondly, dipping the carbon substrate by using a zinc chloride solution, cleaning, drying, carbonizing, and naturally cooling to room temperature to obtain modified biochar;
and step three, dipping the modified biochar obtained in the step two into phosphorus-containing wastewater, or placing the modified biochar into a domestic sewage biological treatment system for a period of time to obtain phosphorus-rich biomass carbon.
Further limiting, in the step one, the agricultural and forestry waste is one or any combination of straw, rice hull, edible fungus matrix, leftover materials, firewood, bark, peanut shell, branch firewood, rolled bark and wood shavings.
Further limiting, the grain diameter of the agricultural and forestry waste particles obtained after crushing is 6-8 mm.
Further defined, the drying temperature in step one is 120 ℃.
Further limiting, in the second step, the concentration of the zinc chloride solution is 30 g/L-70 g/L, the dipping ratio is (0.8-1.2): 1, and the dipping time is 4 h-12 h.
Further limiting, in the second step, the carbonization temperature is 300-450 ℃, and the carbonization time is 60-105 min.
Further, the drying temperature in the second step is 120 ℃.
Further limiting, in the third step, in a secondary sedimentation tank of the domestic sewage biological treatment system or an anaerobic phosphorus release section of the domestic sewage biological treatment system, the total phosphorus concentration is less than 80mg/L, the adding amount of the modified biochar is 0.5-5 g/L, and the retention time is 30 min-3 h.
The resource method is to mix the phosphorus-rich biomass charcoal with soil to be used as a plant growth promoting agent; the plants are planted, the soil nutrition condition is improved, and the growth of the plants is promoted; the addition amount of the phosphorus-rich biomass charcoal is 1-5 wt.%.
Compared with the prior art, the invention has the following beneficial effects:
the invention prepares the exclusive material with high adsorption performance to the phosphorus in the domestic sewage, and has very high selective adsorption to the phosphorus in the sewage;
the method disclosed by the invention changes the fate that phosphorus in the traditional domestic sewage can only be removed, really realizes the recovery and reclamation of phosphorus in the sewage, and provides a new way for improving the shortage of phosphorus resources;
The method takes the agricultural and forestry wastes as raw materials, and the prepared biomass charcoal material with high phosphorus adsorption performance has no secondary pollution and is an environment-friendly material;
the method of the invention finds a new resource way for improving the added value and changing waste into valuable for the agricultural and forestry wastes with huge yield.
The invention takes the agricultural and forestry wastes as the base material, prepares the biochar with excellent performance and special adsorption performance to phosphorus through preliminary activation, modification and carbonization, has simple preparation method and no secondary pollution, is beneficial to realizing the reclamation of the agricultural and forestry wastes and reducing the pollution to the environment, and simultaneously utilizes the excellent phosphorus adsorption performance to adsorb and enrich phosphorus from a domestic sewage biological treatment system. Compared with other phosphorus recovery methods, the phosphorus-rich biomass charcoal material obtained by the method can be recycled without reprocessing, can be directly mixed with soil, can be used as a phosphate fertilizer or a soil conditioner to improve soil fertility and promote plant growth, and has remarkable social, environmental and economic benefits and a wide application prospect.
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description, and are not intended to limit the invention.
Drawings
FIG. 1 is a scanning electron microscope image of a phosphorus-rich biomass charcoal material;
FIG. 2 shows the effect of different amounts of phosphorus-rich biomass charcoal material on phosphorus absorption effect;
FIG. 3 shows the effect of different application rates on the growth of pakchoi and alfalfa.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Example 1: in the embodiment, the method for preparing the phosphorus-rich biomass charcoal material by using agricultural waste straws as a raw material comprises the following steps:
(1) pretreatment of agricultural waste corn straw
Washing corn straws with water, putting the washed corn straws into a drying oven, drying the corn straws at 120 ℃, crushing the corn straws, and sieving the crushed corn straws by 6-8 mm to obtain the corn straws;
(2) preparation of zinc chloride modified corn straw
(3) Weighing a proper amount of sieved corn straws in the step (1), adding 100ml of zinc chloride solution with the concentration of 50g/L, soaking at the ratio of 1.0:1, washing with deionized water after soaking for 8 hours, and drying in a drying oven at 120 ℃.
(3) Preparation of modified corn stalk biochar
And (3) putting the zinc chloride modified corn straw charcoal obtained in the step (2) into a crucible, putting the crucible into a muffle furnace for carbonization, naturally cooling to room temperature after the carbonization temperature is 400 ℃ and the carbonization time is 75min, and grinding to obtain the modified corn straw charcoal powder.
(4) Preparation of phosphorus-rich biomass charcoal material
And (4) taking 1g of the modified corn straw biochar obtained in the step (3), adding 500ml of phosphorus-containing wastewater with the phosphorus concentration of 60mg/L, stirring for 3 hours, and filtering to obtain the phosphorus-rich biomass carbon material.
In this embodiment, the removal rate of phosphorus in step (4) can reach more than 92.3%.
Example 2 this example differs from example 1 in that: the concentration of the zinc chloride solution is 40g/L, 50g/L, 60g/L or 70 g/L.
Example 3 this example differs from example 1 in that: the impregnation ratio was 0.9: 1. 0.8:1, 1.1: 1 or 1.2: 1.
Example 4 this example differs from example 1 in that: the impregnation time is 4.0h, 5.0h, 6.0h, 7.0h, 8.0h, 9.0h, 10.0h, 11.0h and 12.0 h.
Example 5 this example differs from example 1 in that: the carbonization temperature is 300 ℃, 350 ℃ or 450 ℃.
Example 6 this example differs from example 1 in that: the carbonization time is 60min, 90min or 105 min.
Example 7 this example is the removal of phosphorus from sewage in the anaerobic section of a sewage treatment plant by the modified corn straw biomass charcoal prepared under the conditions of example 1, thereby obtaining a phosphorus-rich biomass charcoal material. The specific implementation steps are as follows:
respectively weighing 0.05g, 0.1g, 0.15g, 0.20g and 0.25g of modified corn straw charcoal powder, adding the modified corn straw charcoal powder into a conical flask, weighing 50ml of anaerobic section domestic sewage with the phosphorus content of 10-20 mg/L, pouring the anaerobic section domestic sewage into the conical flask, mixing the anaerobic section domestic sewage with the conical flask, plugging a conical flask plug, placing the conical flask plug into a water bath constant temperature oscillator, oscillating for 3.0h, filtering, and measuring the residual phosphorus content in filtrate. The results are shown in FIG. 2.
As shown in FIG. 2, the modified corn stalk charcoal powder is 0.25g, that is, when the addition amount of the charcoal material in each liter of sewage is 5g, the residual phosphorus content in the solution is the least, and the phosphorus removal rate is more than 90%. And naturally airing the phosphorus-absorbing carbon material obtained under the condition to obtain the phosphorus-rich biomass carbon material.
Example 8: in this example, a soil improvement test is performed by using the phosphorus-rich biomass charcoal material prepared by using 0.25g of the modified corn stalk charcoal powder in example 7, and the specific test steps are as follows:
taking a plurality of 250g of barren sandy soil, applying the 250g of barren sandy soil according to the application proportion of 0%, 1%, 3% and 5%, transplanting seedling alfalfa and pakchoi, putting 3 plants in each pot of each plant into a climatic incubator, culturing for 30 days, and harvesting. The results are shown in FIG. 3, and as shown in the figure, when the barren sandy soil treated by the special material of the embodiment is 1% in the mass ratio of the carbon soil, the barren sandy soil has obvious promotion effect on the growth of the alfalfa and the Chinese cabbage plants.
Claims (10)
1. A method for recovering phosphorus from a domestic sewage biological treatment system, the method comprising the steps of:
cleaning, drying and crushing the agricultural and forestry waste;
secondly, dipping the carbon substrate by using a zinc chloride solution, cleaning, drying, carbonizing, and naturally cooling to room temperature to obtain modified biochar;
and step three, dipping the modified biochar obtained in the step two into phosphorus-containing wastewater, or placing the modified biochar into a domestic sewage biological treatment system for a period of time to obtain phosphorus-rich biomass carbon.
2. The preparation method according to claim 1, wherein the agricultural waste in the first step is one or any combination of straw, rice hull, edible fungus substrate, leftover material, firewood, bark, peanut shell, branch wood, rolled bark and wood shavings.
3. The preparation method according to claim 2, wherein the grain size of the agricultural and forestry waste particles obtained after crushing is 6-8 mm.
4. The method according to claim 1, wherein the drying temperature in the first step is 120 ℃.
5. The preparation method according to claim 1, wherein the concentration of the zinc chloride solution in the second step is 30g/L to 70g/L, the dipping ratio is (0.8-1.2): 1, and the dipping time is 4h to 12 h.
6. The preparation method according to claim 1, wherein the carbonization temperature in the second step is 300-450 ℃ and the carbonization time is 60-105 min.
7. The method according to claim 1, wherein the drying temperature in the second step is 120 ℃.
8. The preparation method according to claim 1, wherein in the third step, the concentration of total phosphorus in the secondary sedimentation tank of the domestic sewage biological treatment system or the anaerobic phosphorus release section of the domestic sewage biological treatment system is less than 80mg/L, the adding amount of the modified biochar is 0.5 g/L-5 g/L, and the retention time is 30 min-3 h.
9. The method for recycling phosphorus-rich biomass charcoal obtained by any one of claims 1 to 7, characterized in that the phosphorus-rich biomass charcoal is mixed with soil to be used as a plant growth promoting agent.
10. The resource recycling method according to claim 9, wherein the phosphorus-rich biomass charcoal is added in an amount of 1 wt.% to 5 wt.%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210361944.6A CN114832774A (en) | 2022-04-07 | 2022-04-07 | Method for recovering phosphorus from domestic sewage biological treatment system and directly recycling phosphorus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210361944.6A CN114832774A (en) | 2022-04-07 | 2022-04-07 | Method for recovering phosphorus from domestic sewage biological treatment system and directly recycling phosphorus |
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