CN109503294A - Carry the application of phosphorus cray shell charcoal - Google Patents
Carry the application of phosphorus cray shell charcoal Download PDFInfo
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- CN109503294A CN109503294A CN201910001854.4A CN201910001854A CN109503294A CN 109503294 A CN109503294 A CN 109503294A CN 201910001854 A CN201910001854 A CN 201910001854A CN 109503294 A CN109503294 A CN 109503294A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
- C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
- C05G3/80—Soil conditioners
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Soil Sciences (AREA)
- Pest Control & Pesticides (AREA)
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Abstract
The present invention prepares charcoal using food garbage cray shell as raw material, through Mg is modified, the phosphorus in Adsorption waste water, and further applies farmland for the cray shell charcoal after Phosphate Sorption as slow-release fertilizer, to promote germination and growth of seedling；The present invention dramatically increases the adsorption capacity of phosphorus through the modified shrimp shell charcoal of Mg, can generate MgHPO with phosphate4With Mg (H2PO4)2；Charcoal after phosphorus adsorption saturation can slow release again, and remarkably promote three-coloured amaranth and cucumber seedling growth in earth culture experiment；Preparation method of the present invention is simple and feasible, has not only realized the effective use to this food garbage of cray shell, but also can inexpensively and effectively remove Phosphorus From Wastewater, and is applied to soil as slow-release phosphate fertilizer, promotes plant growth, to achieve the purpose that recycling.
Description
Technical field
The present invention relates to charcoal reapplying using field, especially cray shell charcoal Phosphate Sorption.
Background technique
Charcoal (Biochar) is biomass raw material under conditions of anaerobism or anoxic, is pyrolyzed and produces through certain temperature
Raw phosphorus content is high, the solid bio-fuel with large specific surface area, also referred to as biomass carbon (Ahmedna et al.,
1997；Demirbas andArin,2010).Since charcoal has large specific surface area, from a wealth of sources, cheap, adsorption energy
The advantages that power is strong, be applied to various harmful pollutants in environment protection field removal waste water (Ahmad et al., 2014；Yao
et al.,2013；Inyang et al.,2016).Meanwhile carbon nitrogen balance, improvement of the charcoal since soil can be restored rapidly
The property of soil, be also applied to agriculture field (Li Jiao etc., 2018；Xu Min etc., 2018).It is generated in daily production and life
Crops such as stalk, husk, pericarp, sawdust and animal wastes and solid waste, all can serve as the raw material of charcoal,
And production method is relatively easy.
Phosphorus is the limiting nutrient substance of organism and plant growth, and the phosphorus for being discharged into water body excessively will lead to water eutrophication
Change (Ozacar, 2003；Smith,2003；Penn andWarren,2009).It is generally believed that dissolving phosphoric acid salt in water body~
0.02mg·L-1Lead to a large amount of algal grown in water body, and then water eutrophication (USEPA, 1995) with regard to potential.2007
Jiangsu Province's TAIHU LAKE crisis in the year shock whole nation, perpetrator is also that phosphorus content is excessively high in water, causes cyanobacteria largely to be broken out, water body
Eutrophication not only influences aquatic ecosystem, but also hinders economic development and the social life of the common people.For a long time, it is
Control water eutrophication, scientific research personnel have been devoted to the research and development of water body dephosphorized technique.Phosphorus can not as one kind
Regeneration and the indispensable resource in industrial and agricultural development, storage level is sharply reduced at present, and the phosphor resource in China has been unable to meet
The demand (Liu Yihua, 2005) of economic development.Therefore, water body dephosphorized technology turns to resource utilization from simple dephosphorization.
Procambius clarkii (latin name Procambarus clarkii, English name RedSwamp Crayfish) is also referred to as red
Crayfish and freshwater crayfish, are commonly called as cray, are the important aquaculture kinds in China.2007 to 2016, China cray
Cultured output increases to 85.23 ten thousand tons by 26.55 ten thousand tons, and it is the world's largest cray that national cultured area, which is more than 9,000,000 mu,
Producing country (Xiao is put, 2017).In March, 2018 is estimated, the feeding shrimp area in the whole nation may break through 1,0,000,000 mu, and cultured output will reach
To more than 1,000,000 tons (Qin Yong etc., 2018).Lakes in Jiangsu Province is numerous, geographical location and cray source area Same Latitude, very suitable
The growth of suitable cray is the earliest introducing of domestic cray.Cray has become the development of Jiangsu Province's culture fishery most
For rapid, most characteristic, most potential kind (Shen Yi, 2010)；Cray cultivation development is swift and violent, consumption market type discharge
Greatly, industrial chain constantly extends, at present cray industry become one of Jiangsu Province's aquatic products leading industry (Chen Huangen etc.,
2017).Only 25 tons of cray (Chen Huangen etc., 2017) is daily sold in Nanjing.But annual catering trade generates a large amount of cray shells, more
Number is all used as domestic rubbish disposal, not only waste of resource, but also influences environment.Therefore, biology is prepared by raw material of cray shell
Charcoal studies its absorption property to phosphorus, and charcoal reaches money as slow-release fertilizer application farmland after discussion phosphorus adsorption saturation in turn
Source reuse has broad application prospects and good economic benefit.Patent 105771899A discloses a kind of using crust
The method that class animal waste prepares dephosphorization and removing heavy metals charcoal, but after the document is to charcoal Phosphate Sorption or heavy metal
Recycling do not study further, in addition, the document is before preparing charcoal, shell class animal waste need to be cleaned and be dried
It is dry, the step for will also consume a large amount of human resources and the energy.
Summary of the invention
Aiming at the problem that above-mentioned food garbage cray shell resource wastes and carries phosphorus charcoal subsequent processing, the present invention is first
It first provides a kind of load phosphorus cray shell charcoal and is preparing the application in slow-release phosphate fertilizer, i.e., it will be to the cray shell after Phosphate Sorption
Charcoal applies farmland, as slow-release phosphate fertilizer to promote agronomic crop seed germination and growth of seedling.The application farmland refers to,
Phosphorus cray shell charcoal will be carried after soil mixes, then plant crops, the sowing amount for carrying phosphorus cray shell charcoal
For the 2%-5% of soil and load phosphorus cray shell charcoal gross mass.
Further, heretofore described crops are cucumber or three-coloured amaranth.
Load phosphorus cray shell charcoal of the present invention is prepared via a method which: after cray shell is crushed, leaching
Not in 2.0mo1L-1MgCl2In solution, 30 ± 2 DEG C are stirred 4 hours；Filter residue, 80 DEG C of drying are cleaned with deionized water after suction filtration；
Then with 10 DEG C of min-1Heating rate be heated to 300 DEG C, keep the temperature 30min, then with 10 DEG C of min-1Heating rate is warming up to 600
DEG C, 2h is kept the temperature, is cooled to room temperature, cray charcoal is obtained；Then it is phosphorous molten cray charcoal to be immersed in various concentration
In liquid, until its Phosphate Sorption is extremely saturated.
Further, in the present invention, the solution containing phosphate is KH2PO4Solution, the preferred 5.69-1138.9mg L of concentration-1。
The present invention is not once purged directly with the modified Phosphate Sorption of Mg using food garbage cray shell as raw material, and for the first time
Phosphorus cray shell charcoal will be carried to use as slow-release phosphate fertilizer, to promote germination and growth of seedling, realize cray shell system
The recycling of standby charcoal, reaches the full resource reuse of food garbage.
Detailed description of the invention
Fig. 1 is LX1, LX2 and LX3 scanning electron microscope (SEM) photograph and its surface Mg distribution diagram of element.
Fig. 2 is the adsorption isotherm of LX1 charcoal Phosphate Sorption.
Fig. 3 is the adsorption isotherm of LX2 charcoal Phosphate Sorption.
Fig. 4 is the adsorption isotherm of LX3 charcoal Phosphate Sorption.
Fig. 5 is the phosphorus ligands effect that column simulator is 5.0mg/L to concentration in waste water.
Fig. 6 is that the phosphorus of load phosphorus charcoal P-LX2 continuously discharges.
Fig. 7 is that the phosphorus of load phosphorus charcoal P-LX3 continuously discharges.
Fig. 8 is the three-coloured amaranth germination situation photo after water planting 7 days.
Fig. 9 is the Seed Germination in Cucumber situation photo after water planting 7 days.
Figure 10 is three-coloured amaranth water planting control group and suction the 13rd day growth of seedling situation photo of P-LX3 group.
Figure 11 is the 13rd day seedling stem length degree contrast schematic diagram (n=73,89) of three-coloured amaranth water planting control group and P-LX3 group；
In figure, * indicates significant difference (p < 0.05), and * * indicates that difference is extremely significant (p < 0.01).
Figure 12 is cucumber water planting control group and suction the 13rd day growth of seedling situation photo of P-LX3 group.
Figure 13 is length vs' schematic diagram (n=17) of the 13rd day seedling stem of cucumber water planting control group and P-LX3 group；
In figure, * indicates significant difference (p < 0.05), and * * indicates that difference is extremely significant (p < 0.01).
Figure 14 is the 13rd day Seedling Biomass contrast schematic diagram (n=17) of cucumber water planting control group and P-LX3 group；
In figure, * indicates significant difference (p < 0.05), and * * indicates that difference is extremely significant (p < 0.01).
Figure 15 is that the 13rd day growth of seedling of three-coloured amaranth earth culture control group and P-LX3 group compares photo.
Figure 16 is the 13rd day seedling stem length degree contrast schematic diagram (n=12) of three-coloured amaranth earth culture control group and P-LX3 group；
In figure, * indicates significant difference (p < 0.05), and * * indicates that difference is extremely significant (p < 0.01).
Figure 17 is that the 13rd day growth of seedling of cucumber earth culture control group and P-LX3 group compares photo.
Figure 18 is the 13rd day seedling stem length degree comparison diagram (n=7-8) of cucumber earth culture control group and P-LX3 group；
In figure, * indicates significant difference (p < 0.05), and * * indicates that difference is extremely significant (p < 0.01).
Figure 19 is the 13rd day Seedling Biomass comparison diagram (n=7-8) of cucumber earth culture control group and P-LX3 group；
In figure, * indicates significant difference (p < 0.05), and * * indicates that difference is extremely significant (p < 0.01).
Specific embodiment
Cray shell in following embodiment is collected in Nanjing cray food garbage.
Embodiment 1 prepares cray shell charcoal
Prepare cray shell charcoal, the specific steps are as follows:
(1) by the shrimp shell of collection, a part cleaning (cleaning method: after dish washing liquid has cleaned greasy dirt, tap water wash clean),
Another part does not clean, and is then respectively dried, and smashes it through 2mm sieve.
(2) by suitable MgCl2·6H2O, which is added in ultrapure water, configures 2.0mo1L-1MgCl2Solution 500mL, respectively
The shrimp shell powder 50g of cleaning treatment and non-cleaning treatment obtained in (1) is added, is stirred in magnetic stirring apparatus constant temperature (30 ± 2 DEG C)
It mixes 4 hours；Then obtain two kinds of biomass suspensions are filtered by vacuum, 80 DEG C are dried 24 hours, and two kinds of load magnesium ions are obtained
Shrimp shell powder.
(3) it weighs the shrimp shell powder of the above two load magnesium ion of constant weight and is not loaded with the shrimp shell meal of magnesium ion
End has been put into nitrogen protection tube furnace (OTF-1200X) pyrolysis and has fired, with 10 DEG C of min-1The heating rate of left and right rises to
300 DEG C, 30min is stopped, with 10 DEG C of min-1The heating rate of left and right rises to 600 DEG C, stops 2h, then cools to room temperature；It takes
Powder out obtains the cray shell charcoal that pyrolysis temperature is 600 DEG C of preparations.Being respectively designated as LX1, (shrimp shell cleaning is unsupported
Magnesium), LX2 (shrimp shell clean back loading magnesium), LX3 (shrimp shell does not clean load magnesium) (table 1), then weigh, calculate yield.
3 kinds of charcoals prepared by table 1
The yield of LX1, LX2 and LX3 charcoal prepared by the present embodiment is 50.4%, 37.9% and 37.4% respectively.
(4) by the charcoal of preparation with inductive coupling plasma emission spectrograph (ICP-OES, Optima 5300,
PerkinElmer, the U.S.) the above-mentioned mineral element composition for preparing material is analyzed, scanning electron microscope coupling energy dispersion X is penetrated
Line fluorescence spectrum (SEM-EDX, JEOL JSM-6490, Japan) analysis charcoal surface topography and surface-element distributive observation, knot
Fruit is as shown in Figure 1.
It is observed by Fig. 1 picture as it can be seen that three kinds of charcoals are loose porous；In terms of the Mg Elemental redistribution on its surface, LX2 and
The Mg constituent content of LX3 is apparently higher than LX1, illustrates that magnesium is loaded successfully in LX2 and LX3 charcoal.
The content of mineral element Al, Ca, Mg, K, Na of LX1, LX2 and LX3 are shown in Table 2.
The content of table 2LX charcoal mineral element
Table 2 is consistent with scanning electron microscope (SEM) photograph and its surface Mg distribution diagram of element result, and compared with LX1, the Mg of LX2 and LX3 contain
Amount increases to 5.47%, 4.75% from 0.11% respectively, again demonstrates by MgCl2Pretreatment, Mg have successfully invaded biology
In charcoal.
The performance study of 2 cray shell charcoal of embodiment removal Phosphorus From Wastewater
In the present embodiment, the detection method of phosphorus is referring to " water and effluent monitoring analysis method " (2002), using anti-point of molybdenum antimony
Light photometry measures phosphorus content in solution.
1, isothermal adsorption batch experiment
The phosphorous aqueous solution of LX1, LX2 and LX3 charcoal of 0.1g and 30mL various concentration (is used into KH respectively2PO4Solution
Phosphorus-containing wastewater is simulated, the phosphorus concentration of LX1 is set are as follows: 5.69,56.9,113.9,170.8,227.8,341.7mg L-1, LX2 and
The phosphorus concentration of LX3 are as follows: 56.9,113.9,170.8,284.7,341.7,455.6,683.4 and 1138.9mg L-1) 50mL is added
In polyethylene centrifuge tube, for 24 hours (30 DEG C, 125r/min), 0.45 μm of membrane filtration analyzes phosphorus (P) content in filtrate to constant temperature oscillation.
Charcoal is calculated to the adsorbance of P.In triplicate, experimental data is indicated with average value ± standard deviation for every group of experiment.
Adsorbance: refer to adsorbance of the charcoal to phosphorus of unit mass.S(mg g-1) refer to the adsorbance after adsorption equilibrium, it counts
It is as follows to calculate formula:
Wherein, C0、Ce(mg L-1) concentration when being respectively the initial concentration of phosphorus solution, reaching balance；V (L) is phosphorus solution
Volume；M (g) is the quality of charcoal.
The adsorption isotherm difference that LX1, LX2 and LX3 charcoal adsorb P is as in Figure 2-4.Each biology under this experiment condition
Adsorption capacity of the charcoal to P in water are as follows: LX1 < LX2 < LX3.LX1 is about 74mg g to the maximum adsorption ability of P-1, and LX2 and
LX3 is to the maximum adsorption ability of P about 138mg g respectively-1With 176mg g-1.Significantly increased by the modified lobster shell charcoal of Mg
The adsorption capacity to P is added, the possible reason is LX2 and LX3 charcoal releases Mg, MgHPO can have been generated with phosphate4And Mg
(H2PO4)2, to increase to the removal capacity of P in aqueous solution (Yao et al., 2013).LX3 is greater than the adsorption capacity of P
LX2, may be more loose porous due to the surface ratio LX2 of LX3, also further illustrates that the cleaning of shrimp shell does not influence charcoal to P
Absorption.Therefore, the shrimp shell of collection can not clean, and directly prepare charcoal, not only save the cost, but also not impact effect.
The above case study on implementation shows to prepare charcoal with food garbage lobster shell, good to the absorption property of P in waste water, and
Economic cost is low, and potential adsorbent effective as cheap has reached the effect of recycling recycling for removing P in waste water
Fruit.
2, column processing unit simulated experiment
By indoor column experiments, a certain amount of quartz sand: being first packed into the column bottom of the following figure by simulated wastewater processing unit technique,
Then by 1.0 grams of loading columns of preferred LX3 charcoal, a certain amount of quartz sand is finally refilled in charcoal top.With 1.0ml
min-1Flow velocity by phosphorous aqueous solution (P concentration 5.0mg L-1) inject in charcoal post, continuous collect of automatic collection is discharged water sample, point
Phosphorus content in aqueous solution is precipitated.
In the present embodiment, 1.0g LX3 biology charcoal post, P concentration 5.0mg L in water are housed-1, column flow velocity be 1.0ml
min-1When, it is 560ml in effluent volume, 99% can achieve to the removal rate of P；When efflux is 1080ml, P is gone
Except rate can achieve 90% (Fig. 5).Illustrate that lobster shell prepares charcoal, it is good to the absorption property of P in waste water, and economic cost
It is low, can attempt as cheap and effective adsorbent for removing P in waste water.
The release experiment of 3 phosphorus of embodiment
It is 1138.9mg L that 30mL phosphorus concentration is added in LX2 the and LX3 charcoal obtained respectively to 0.1g embodiment 1-1Water
Solution, for 24 hours, 8000 turns of centrifugation 10min, incline 30 DEG C of constant temperature oscillations supernatant, retains filter residue, i.e., obtains absorption P saturation respectively
LX3 (P-LX3) after LX2 (P-LX2) and absorption P afterwards is saturated.
0.1gP-LX2 and P-LX3 charcoal is mixed with 30mL deionized water respectively, 30 DEG C of constant temperature oscillation 48h, 8000 turns
It is centrifuged 10min, takes supernatant, analyzes phosphorus content in filtrate；Then remove supernatant, again add 30mL fresh deionized water in
P is discharged in charcoal again.Experiment continues 4 times altogether, and in triplicate, experimental data is with average value ± standard deviation table for every group of experiment
Show.
By 4 wheel slow release experiments, the burst size of the 4 wheel P of P-LX2 is respectively 34.48,35.08,25.67 and
19.22mg g-1The burst size of (Fig. 6), the 4 wheel P of P-LX3 are respectively 32.70,35.10,24.76 and 23.32mg g-1(Fig. 7).
The experimental results showed that quite a few P of LX2 and LX3 charcoal absorption can discharge again, illustrate useless containing P for processed
LX2 and LX3 charcoal after water, it is possible to be used as sustained release P fertilizer.
The recycling of charcoal after 4 phosphorus adsorption saturation of embodiment
1, three-coloured amaranth and cucumber seedling growth solution culture:
Seed is sprouted and the bioassay of early stage growth of seedling is a kind of simple and common ecological toxicology test, can be with
For assessing influence (Austin, 1966) of the charcoal to plant growth.A certain number of three-coloured amaranth seeds and cucumber are layered on leaching
Have on the blotting paper of deionized water, have 0.1g embodiment 3 obtain absorption P saturation after LX3 charcoal (P-LX3) and not
In culture dish containing charcoal (control group), seed sprouting (6, each culture dish of cucumber seeds, each training of three-coloured amaranth seed are carried out
Support 25-30, ware).It is properly added water daily, observes the sprouting of seed, and measures early stage growth of seedling.Every group setting 3 flat
Row.Experimental data is indicated with average value ± standard deviation.Single factor test t method of inspection carries out otherness to data group and significantly analyzes.
The control group of charcoal and the charcoal group of addition absorption P is not added, percentage of seedgermination is very high, three-coloured amaranth germination
Rate is 97.3% and 98.9% (Fig. 8) respectively, and Seed Germination in Cucumber rate is 94.4% (Fig. 9).
It is compared as seen from Figure 10 with control group, the charcoal group three-coloured amaranth seedling root of addition absorption P is more flourishing, and miaoye is more fertile
Greatly, growth of seedling is faster.Every group of seedling is for statistical analysis to collecting after germination 13 days, adds the charcoal group of Phosphate Sorption
The length of three-coloured amaranth stem is than control group leader 70.8% (Figure 10 and 11).It is consistent with three-coloured amaranth experimental result, the charcoal group of addition absorption P
Cucumber seedling is grown faster (Figure 12).After Seeds Germination Tests start 13 days, the length for adsorbing the charcoal group cucumber seedling stem of P is compared
According to group leader 27.8% (Figure 13), biomass than control group weight 22.2% (Figure 14).
The above case study on implementation shows to can be used as fertilizer for the lobster shell charcoal after processed waste water containing P and apply
With promotion plant seedling growth.
2, three-coloured amaranth and the experiment of cucumber seedling growth earth culture
The farmland topsoil of academy of agricultural sciences, Jiangsu Province six directions experiment centre is weighed, is air-dried, 2mm sieve is crossed, admixes different quality reality
The charcoal of the P-LX3 of the acquisition of example 3 is applied, making the content of charcoal is respectively the 2% and 5% of soil and charcoal gross mass.So
Weigh that (P-LX3 charcoal quality accounts for soil and P-LX3 charcoal without any charcoal, charcoal containing 2%P-LX3 respectively afterwards
The 2% of gross mass), 5%P-LX3 charcoal (P-LX3 charcoal quality account for soil and P-LX3 charcoal gross mass 5%)
Each 40g of soil is put into small flower (specific design is shown in Table 3):
3 earth culture experimental design of table
The three-coloured amaranth seed (5) of identical quantity and cucumber seeds (3) are put into progress seed sprouting in soil, it is daily appropriate
Watering, and growth of seedling is observed, seedling is collected after 13 days, is cleaned root, is measured the length of stem, and cucumber seedling biomass of weighing
(three-coloured amaranth seedling is too small, only measures the length of stem).Every group setting 3 parallel.Experimental data indicates with average value ± standard deviation,
Single factor test t method of inspection carries out otherness to data group and significantly analyzes.Testing result is as shown in Figure 15-Figure 19.
As seen from Figure 15, the control group of charcoal and the charcoal group of addition absorption P is not added, three-coloured amaranth germination percentage is all
80.0%.Consistent with solution culture result, Seeds Germination Tests start 13 days, add the charcoal group three-coloured amaranth root system of P-LX3 more
For prosperity, Ye Miao is greener, looser (Figure 15).Compared with the control group, the length of 2% and 5%P-LX3 charcoal group three-coloured amaranth stem is added
Degree is than control group leader 18.4% and 34.1% (Figure 16), and the blade third piece leaf of part Experiment group has begun growth (figure
15)。
As seen from Figure 17, the charcoal group of the 2% and 5% absorption P of control group and addition of charcoal, cucumber germination percentage is not added
It is 88.9%, 77.8% and 88.9%.Consistent with three-coloured amaranth result, Seed Germination in Cucumber experiment starts 13 days, the life of addition absorption P
Object charcoal group cucumber growth is more vigorous (Figure 17).Compared with the control group, the length ratio of 2% and 5% charcoal group Cucumis sativus stem is added
It compares group leader 30.8% and 19.8% (Figure 18), biomass fresh weight is than control group weight 42.0% and 50.2% (Figure 19).
Above-mentioned case study on implementation result further proves, in the charcoal addition soil after processed waste water containing P, although not having
There is the germination for promoting three-coloured amaranth and cucumber seeds, but plant seedling growth can be promoted.
In specific implementation, the charcoal after the absorption P saturation of other methods acquisition also can be used is tested, and such as will
Cray charcoal is immersed in the P solution of various concentration, until it adsorbs P to being saturated, is re-used as during P fertilizer is manured into soil.
The above case study on implementation shows that cray shell is that raw material production charcoal is simple and feasible, and the charcoal of preparation can be effective
P in water removal is removed, and is significantly increased through adsorption capacity of the magnesium-modified charcoal to P in waste water.To the charcoal after P adsorption saturation
It can slow release P again.Water planting and earth culture germination and seedling are it is demonstrated experimentally that add the life after processed waste water containing P
Object charcoal can promote three-coloured amaranth and cucumber seedling growth to develop.Therefore, cray shell prepares charcoal, and economical and convenient can be used as
Cheap and effective adsorbent is for removing P in waste water；And the charcoal after processed waste water containing P can be used as sustained release P
Fertilizer is applied to soil, promotes plant growth and development.
Claims (5)
1. carrying phosphorus cray shell charcoal is preparing the application in slow-release phosphate fertilizer.
2. application as described in claim 1, which is characterized in that the application refers to, will carry phosphorus cray shell charcoal in soil
Crops are planted after earth mixing again, the sowing amount for carrying phosphorus cray shell charcoal is soil and load phosphorus cray shell charcoal
The 2%-5% of gross mass.
3. application according to claim 2, which is characterized in that the crops are cucumber or three-coloured amaranth.
4. application a method according to any one of claims 1-3, which is characterized in that the load phosphorus cray shell charcoal is by as follows
Method preparation:
1) after crushing cray shell, it is immersed in 2.0mo1L-1MgCl2In solution, 30 ± 2 DEG C are stirred 4 hours, are then filtered
Clean filter residue, 80 DEG C of drying afterwards and with deionized water；Again with 10 DEG C of min-1Heating rate be heated to 300 DEG C, keep the temperature 30min；
With 10 DEG C of min-1Heating rate is warming up to 600 DEG C, keeps the temperature 2h, is cooled to room temperature, and obtains cray charcoal；
2) cray charcoal is immersed in solution containing phosphate, until Phosphate Sorption obtains the load phosphorus cray shell to being saturated
Charcoal.
5. application as claimed in claim 4, which is characterized in that the solution containing phosphate refers to KH2PO4Solution.
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Application publication date: 20190322 |