CN106146153B - Potassium and the method for manufacturing carbon-base slow release type composite fertilizer are extracted from urine waste water - Google Patents
Potassium and the method for manufacturing carbon-base slow release type composite fertilizer are extracted from urine waste water Download PDFInfo
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- 210000002700 urine Anatomy 0.000 title claims abstract description 67
- 239000003337 fertilizer Substances 0.000 title claims abstract description 48
- 239000002351 wastewater Substances 0.000 title claims abstract description 47
- 229910052700 potassium Inorganic materials 0.000 title claims abstract description 40
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 239000011591 potassium Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 239000002131 composite material Substances 0.000 title abstract 4
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 28
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 6
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical group [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 36
- 150000001875 compounds Chemical class 0.000 claims description 21
- 159000000003 magnesium salts Chemical class 0.000 claims description 21
- 239000011777 magnesium Substances 0.000 claims description 19
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 18
- 238000000197 pyrolysis Methods 0.000 claims description 18
- 229910052698 phosphorus Inorganic materials 0.000 claims description 13
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 12
- 239000011574 phosphorus Substances 0.000 claims description 12
- 238000002791 soaking Methods 0.000 claims description 12
- 239000002699 waste material Substances 0.000 claims description 12
- 239000012266 salt solution Substances 0.000 claims description 11
- 238000003756 stirring Methods 0.000 claims description 9
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000002244 precipitate Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 239000006228 supernatant Substances 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 2
- 230000001681 protective effect Effects 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 18
- 238000011084 recovery Methods 0.000 abstract description 13
- 239000002689 soil Substances 0.000 abstract description 13
- 239000010865 sewage Substances 0.000 abstract description 11
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 9
- 239000002686 phosphate fertilizer Substances 0.000 abstract description 7
- YWEUIGNSBFLMFL-UHFFFAOYSA-N diphosphonate Chemical compound O=P(=O)OP(=O)=O YWEUIGNSBFLMFL-UHFFFAOYSA-N 0.000 abstract description 6
- DLYUQMMRRRQYAE-UHFFFAOYSA-N phosphorus pentoxide Inorganic materials O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 abstract description 6
- -1 compound nitrogen phosphate Chemical class 0.000 abstract description 5
- RDXARWSSOJYNLI-UHFFFAOYSA-N [P].[K] Chemical compound [P].[K] RDXARWSSOJYNLI-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000618 nitrogen fertilizer Substances 0.000 abstract description 3
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 abstract 1
- KCIDZIIHRGYJAE-YGFYJFDDSA-L dipotassium;[(2r,3r,4s,5r,6r)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl] phosphate Chemical compound [K+].[K+].OC[C@H]1O[C@H](OP([O-])([O-])=O)[C@H](O)[C@@H](O)[C@H]1O KCIDZIIHRGYJAE-YGFYJFDDSA-L 0.000 abstract 1
- 229940072033 potash Drugs 0.000 abstract 1
- 235000015320 potassium carbonate Nutrition 0.000 abstract 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 abstract 1
- 230000035558 fertility Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 125000000524 functional group Chemical group 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 235000012245 magnesium oxide Nutrition 0.000 description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical class [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 3
- YQRTZUSEPDULET-UHFFFAOYSA-K magnesium;potassium;phosphate Chemical compound [Mg+2].[K+].[O-]P([O-])([O-])=O YQRTZUSEPDULET-UHFFFAOYSA-K 0.000 description 3
- 239000002366 mineral element Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 235000015097 nutrients Nutrition 0.000 description 3
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Pest Control & Pesticides (AREA)
- Soil Sciences (AREA)
- Fertilizers (AREA)
- Processing Of Solid Wastes (AREA)
- Treatment Of Sludge (AREA)
Abstract
Potassium is extracted in disclosing a kind of waste water from urine and the method for carbon-base slow release type composite fertilizer and thus obtained carbon-base slow release type composite fertilizer is manufactured.The present invention can significantly improve the rate of recovery of potassium in urine waste water, and during the urine sewage that the method for the present invention is used for after becoming thoroughly decomposed, the fertilizer for obtaining is carbon-base slow release compound nitrogen phosphate fertilizer, wherein the nitrogenous fertilizer content counted with nitrogen is 4%~6%, it is 20%~30% with the phosphate fertilizer content that phosphorus pentoxide is counted；When the method for the present invention is used for freshly voided urine or has removed the urine sewage of ammonia nitrogen, the fertilizer for obtaining is carbon-base slow release phosphorus potassium complex fertilizer, the potash fertilizer content wherein counted with aoxidizing dipotassium is 15%~20%, is 32%~50% with the phosphate fertilizer content that phosphorus pentoxide is counted.Additionally, the carbon-base slow release type composite fertilizer as obtained in the method for the present invention is rich in organic carbon, and fertilizer efficiency release is slow, can significantly improve lean soil.
Description
Technical Field
The invention relates to the technical field of urine wastewater recycling treatment, in particular to a method for extracting potassium from urine wastewater and preparing a carbon-based slow-release compound fertilizer.
Background
The background of the related art of the present invention will be described below, but the description does not necessarily constitute the prior art of the present invention.
In agriculture of China, excessive use of chemical fertilizers easily causes reduction of soil fertility and soil hardening. The porous structure of the biochar can retain water and fertilizer, prevent the nutrient elements in the fertilizer from being quickly lost, and improve the utilization rate of the fertilizer. Urine contains high concentration of nutrient elements, and per cubic meter of urine contains about 8 kg of nitrogen, 0.8 kg of phosphorus and 2.2 kg of potassium. Urine wastewater is separately collected and subjected to resource treatment, so that the slow release fertilizer applicable to improvement of barren soil is prepared, the soil fertility is improved while the pressure of nitrogen and phosphorus treatment in sewage is reduced, and the sustainable development of the fields of environmental protection and agriculture is realized.
Disclosure of Invention
The invention provides a method for extracting potassium from urine wastewater and manufacturing a carbon-based slow-release compound fertilizer and the carbon-based slow-release compound fertilizer prepared by the method, aiming at the problems of rich nutrient elements in urine, reduced soil fertility and the like.
According to one aspect of the invention, the method for extracting potassium from urine wastewater and manufacturing the carbon-based slow-release compound fertilizer comprises the following steps:
(1) cleaning and crushing forest waste, and then soaking in a magnesium salt solution for not less than 1 h; the magnesium salt is a soluble magnesium salt;
(2) the soaked forest waste is put in an oxygen-isolated environment for pyrolysis to obtain modified biochar; the pyrolysis temperature is 400-700 ℃, and the pyrolysis time is 0.5-4 h;
(3) and (3) adding the modified biochar into urine wastewater, oscillating or stirring, removing supernatant, collecting precipitate, and airing or drying to obtain the carbon-based slow-release compound fertilizer.
The magnesium salt in the invention can be magnesium chloride, and the concentration of the magnesium chloride in the magnesium salt solution is 100 g/L-500 g/L.
Preferably, the adding amount of the modified biochar in the step (3) satisfies the following relationship:
wherein S is the adding amount of the modified biochar and the unit is kg/m3；CKThe potassium concentration in the urine wastewater is mg/L; v is the volume of urine wastewater in m3(ii) a Gamma is the ratio of the concentration of potassium to the concentration of phosphorus in the urine wastewater, and is not a dimensional unit; cMgThe concentration of magnesium chloride in the magnesium salt solution is g/L, and α is the magnesium content constant in the modified biochar, and the unit is L/mol.
Further preferably, when CMgWhen the content is 100 g/L-300 g/L, α is 0.08, and 6 is CMgWhen the concentration is 300g/L to 500g/L, α is 0.244/CMg。
The urine wastewater in the invention can be fresh urine, or urine sewage from which ammonia nitrogen is removed, or decomposed urine sewage.
The second aspect of the invention provides a carbon-based slow-release compound fertilizer prepared by the method of the first aspect of the invention.
When the method is used for the decomposed urine sewage, the obtained fertilizer is a carbon-based slow-release nitrogen-phosphorus compound fertilizer, wherein the content of a nitrogen fertilizer in terms of nitrogen is 4% -6%, and the content of a phosphate fertilizer in terms of phosphorus pentoxide is 20% -30%; when the method is used for fresh urine or urine sewage from which ammonia nitrogen is removed, the obtained fertilizer is a carbon-based slow-release phosphorus-potassium compound fertilizer, wherein the content of a potassium fertilizer in terms of dipotassium oxide is 15% -20%, and the content of a phosphate fertilizer in terms of phosphorus pentoxide is 32% -50%. In addition, the carbon-based slow-release compound fertilizer prepared by the method is rich in organic carbon, slow in fertilizer efficiency release and capable of remarkably improving barren soil.
Detailed Description
Exemplary embodiments of the present invention are described in detail below. The description of the exemplary embodiments is for purposes of illustration only and is not intended to limit the invention, its application, or uses.
The invention provides a method for extracting potassium from urine wastewater and manufacturing a carbon-based slow-release compound fertilizer in a first aspect, which comprises the following steps:
(1) cleaning and crushing forest waste, and then soaking in a magnesium salt solution;
(2) the soaked forest waste is put in an oxygen-isolated environment for pyrolysis to obtain modified biochar;
(3) and (3) adding the modified biochar into urine wastewater, oscillating or stirring, removing supernatant, collecting precipitate, and airing or drying to obtain the carbon-based slow-release compound fertilizer.
The forest waste can be pyrolyzed at high temperature under the anoxic condition to form biochar, the biochar has larger specific surface area and a microporous structure, surface functional groups are rich, and can adsorb heavy metals and organic pollutants, so that the biological effectiveness and the environmental risk of the pollutants are reduced, and in addition, the biochar has the effects of promoting plant growth, slowly decomposing and the like. In order to improve the adsorption capacity and adsorption capacity of the biochar as much as possible, the method adopts a magnesium salt solution to soak the forest waste before high-temperature pyrolysis. The magnesium chloride soaking can change the functional groups on the surface of the biochar, and a large amount of magnesium oxides are formed on the surface of the modified biochar, on one hand, the magnesium oxides can extract and fix potassium by forming a potassium magnesium phosphate precipitate, and on the other hand, the magnesium oxides can chemically react with phosphate radical and ammonium radical ions, so that phosphorus and nitrogen elements are extracted and fixed. The soaking time is not less than 1h, if the soaking time is too short, the magnesium salt can not fully react with the biochar, and if the soaking time is too long, the period for manufacturing the carbon-based slow-release compound fertilizer is increased, the cost is indirectly increased, and the practicability of the method is reduced.
The pyrolysis temperature is 400-700 ℃, and the pyrolysis time is 0.5-4 h. The higher pyrolysis temperature can continuously enrich C, P and mineral elements in the modified biochar, and increase the specific surface area and water holding capacity of the modified biochar. However, the higher the pyrolysis temperature is, the lower the density of the functional groups on the surface of the modified biochar is, which is not favorable for fully extracting and fixing potassium in the urine wastewater.
The magnesium salt in the present invention is a soluble magnesium salt, and for example, magnesium sulfate or magnesium chloride can be used. Preferably, magnesium salt is prepared by using magnesium chloride, and the concentration of the magnesium chloride in the magnesium salt solution is 100 g/L-500 g/L. In a certain concentration range, the higher the concentration of magnesium chloride in the magnesium salt solution is, the better the modification effect of magnesium on the biochar is, and the higher the adsorption capacity of the obtained modified biochar is; if the concentration of the magnesium chloride is too low, the modification effect of the magnesium on the biochar is not obvious; if the concentration of the magnesium chloride is too high, the modification effect cannot be obviously improved continuously, and if the magnesium is excessive, the cost for preparing the carbon-based slow-release compound fertilizer is increased.
The pyrolysis reaction should be under the condition of oxygen-isolated environment, and in the present invention, the oxygen-isolated environment can be formed by adopting a closed container or introducing a protective gas.
In some embodiments of the present invention, the amount of the modified biochar added in step (3) satisfies the following relationship:
wherein S is the adding amount of the modified biochar and the unit is kg/m3；CKThe potassium concentration in the urine wastewater is mg/L; v is the volume of urine wastewater in m3(ii) a Gamma is the ratio of the concentration of potassium to the concentration of phosphorus in the urine wastewater, and is not a dimensional unit; cMgThe concentration of magnesium chloride in the magnesium salt solution is g/L, and α is the magnesium content constant in the modified biochar, and the unit is L/mol.
Preferably, when CMgWhen the content is 100 g/L-300 g/L, α is 0.086, and when C isMgWhen the concentration is 300g/L to 500g/L, α is 0.244/CMg。
In order to ensure that the modified biochar is in full contact reaction with minerals in the urine wastewater, the stirring speed in the step (3) can be 100-200 rpm, and the stirring time is 24 h.
In the invention, the urine wastewater can be fresh urine, or urine sewage from which ammonia nitrogen is removed, or decomposed urine sewage. When the method is used for the decomposed urine sewage, the obtained fertilizer is a carbon-based slow-release nitrogen-phosphorus compound fertilizer, wherein the content of a nitrogen fertilizer in terms of nitrogen is 4% -6%, and the content of a phosphate fertilizer in terms of phosphorus pentoxide is 20% -30%. When the method is used for fresh urine or urine sewage from which ammonia nitrogen is removed, the obtained fertilizer is a carbon-based slow-release phosphorus-potassium compound fertilizer, wherein the content of a potassium fertilizer in terms of dipotassium oxide is 15% -20%, and the content of a phosphate fertilizer in terms of phosphorus pentoxide is 32% -50%.
The modified biochar contains a certain amount of ash, on one hand, partial mineral elements in the ash can be combined with functional groups on the surface of the modified biochar, the number of the functional groups on the surface of the modified biochar, which can be combined with potassium, nitrogen and phosphorus in urine wastewater, is reduced, and the recovery rate of potassium, nitrogen and phosphorus in the urine wastewater is further reduced. On the other hand, mineral elements such as Na, K, Mg, Ca and the like exist in ash in the form of oxides or carbonates, are alkaline after being dissolved in water, and can change the pH value of urine wastewater after being added into the urine wastewater, thereby changing the chemical reaction process for manufacturing the carbon-based slow-release compound fertilizer, and influencing the mineral types of the carbon-based slow-release compound fertilizer and the recovery rate of potassium, nitrogen and phosphorus in the urine. Based on this, the step (2) may further include: cleaning the modified biochar and removing ash in the modified biochar.
The modified biochar contains rich C elements, and can realize the balance of carbon elements in soil. In agriculture, the fertilizer is overused, so that the soil fertility is easily reduced, the soil is hardened, the porous structure of the modified biochar can retain water and fertilizer, improve poor soil, enhance the storage capacity of the soil and improve the soil fertility. In addition, the surface of the modified biochar has adsorption and complexation effects on phosphorus and potassium, so that the phosphorus and the potassium are not pure water soluble, and the slow release of the phosphorus and the potassium is realized; the surface of the modified biochar can also adsorb potassium magnesium phosphate precipitate through charge characteristics, so that the potassium magnesium phosphate serving as fertility is slowly released.
The second aspect of the invention provides a carbon-based slow-release compound fertilizer prepared by the method of the first aspect of the invention.
The present invention will be further described with reference to the following examples. These examples are merely illustrative of preferred embodiments of the present invention and the scope of the present invention should not be construed as being limited to these examples.
Example 1
According to the process parameters of the table 1, the following steps are adopted to extract potassium from urine wastewater and prepare the carbon-based slow-release compound fertilizer:
(1) cleaning and crushing forest waste, and then soaking the forest waste in a magnesium chloride solution;
(2) the soaked forest waste is put in an oxygen-isolated environment for pyrolysis to obtain modified biochar; the pyrolysis time is 2 h;
(3) and (3) adding the modified biochar into 5L urine wastewater, stirring at 200rpm for 24h, removing supernatant after stirring, collecting precipitate, and drying to obtain the carbon-based slow-release compound fertilizer.
Measurement of Potassium concentration C in urine wastewaterKAnd the potassium concentration C 'in the urine wastewater after the preparation of the carbon-based slow-release compound fertilizer'KEach set of experiments was measured 3 times and the recovery rate R of potassium in urine wastewater was calculated according to the following formula:
R＝(CK-C′K)/CK×100％
examples 2 to 12
Examples 2 to 12 were carried out in a similar manner to example 1 except for the contents shown in table 1, and the recovery rate R of potassium in urine wastewater was calculated.
TABLE 1 Process parameters and recovery of potassium from urine wastewater
| Examples | Concentration of magnesium chloride/(g/L) | Soaking time/(h) | Pyrolysis temperature/(. degree.C.) | Recovery of Potassium/(%) |
| 1 | 50 | 3 | 400 | 75 |
| 2 | 100 | 3 | 400 | 80 |
| 3 | 300 | 3 | 400 | 85 |
| 4 | 500 | 3 | 400 | 88 |
| 5 | 700 | 3 | 400 | 90 |
| 6 | 300 | 0.5 | 400 | 70 |
| 7 | 300 | 1 | 400 | 81 |
| 8 | 300 | 5 | 400 | 85 |
| 9 | 300 | 3 | 300 | 78 |
| 10 | 300 | 3 | 550 | 87 |
| 11 | 300 | 3 | 700 | 89 |
| 12 | 300 | 3 | 800 | 88 |
As can be seen from Table 1, the concentration of magnesium chloride is not preferably too small. The recovery rate of potassium in the urine wastewater is increased along with the prolonging of the soaking time of the forest waste in the magnesium chloride solution, but after the soaking time is more than 3 hours, the increase range of the recovery rate of potassium in the urine wastewater is not obvious, and the soaking time can be kept between 1 hour and 3 hours from the aspect of economic benefit. The pyrolysis temperature also has an influence on the recovery rate of potassium in the urine wastewater, the higher temperature is favorable for improving the recovery rate of potassium in the urine wastewater, but after the temperature is higher than 550 ℃, the increase of the recovery rate of potassium in the urine wastewater is not obvious, and after the pyrolysis temperature is higher than 700 ℃, the recovery rate of potassium in the urine wastewater is reduced to some extent.
While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the specific embodiments described and illustrated in detail herein, and that various changes may be made therein by those skilled in the art without departing from the scope of the invention as defined by the appended claims.
Claims (6)
1. A method for extracting potassium from urine wastewater and manufacturing a carbon-based slow-release compound fertilizer is characterized by comprising the following steps:
(1) cleaning and crushing forest waste, and then soaking in a magnesium salt solution for not less than 1 h; the magnesium salt is a soluble magnesium salt;
(2) the soaked forest waste is put in an oxygen-isolated environment for pyrolysis to obtain modified biochar; the pyrolysis temperature is 400-700 ℃, and the pyrolysis time is 0.5-4 h;
(3) adding the modified biochar into urine wastewater, oscillating or stirring, removing supernatant, collecting precipitate, and airing or drying to obtain the carbon-based slow-release compound fertilizer; wherein,
the magnesium salt is magnesium chloride, and the concentration of the magnesium chloride in the magnesium salt solution is 100 g/L-500 g/L;
the adding amount of the modified biochar in the step (3) meets the following relation:
wherein S is the adding amount of the modified biochar and the unit is kg/m3；CKThe potassium concentration in the urine wastewater is mg/L; v is the volume of urine wastewater in m3(ii) a Gamma is the ratio of the concentration of potassium to the concentration of phosphorus in the urine wastewater, and is not a dimensional unit; cMgThe concentration of magnesium chloride in the magnesium salt solution is g/L, α is the magnesium content constant in the modified biochar, the unit is L/mol, when C isMgWhen the content is 100 g/L-300 g/L, α is 0.086, and when C isMgWhen the concentration is 300g/L to 500g/L, α is 0.244/CMg。
2. The method of claim 1, wherein step (2) further comprises: and cleaning the modified biochar, and removing ash in the modified biochar.
3. The method of claim 1, wherein the oxygen-free ambient condition is created by using a closed container or introducing a protective gas.
4. The method according to claim 1, wherein the stirring speed in the step (3) is 100rpm to 200rpm and the stirring time is 24 hours.
5. The method according to claim 1, wherein the urine wastewater is fresh urine, or urine wastewater from which ammonia nitrogen has been removed, or decomposed urine wastewater.
6. The carbon-based slow-release compound fertilizer prepared by the method according to any one of claims 1 to 5.
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| CN107602211A (en) * | 2017-08-30 | 2018-01-19 | 常州市海若纺织品有限公司 | A kind of method that compound fertilizer is prepared based on rice wine production waste water |
| CN109160568A (en) * | 2018-09-15 | 2019-01-08 | 天津大学 | A kind of processing method for realizing urine waste water reclaiming |
| CN109160569A (en) * | 2018-09-15 | 2019-01-08 | 天津大学 | A kind of processing method for realizing urine waste water reclaiming |
| CN109160572A (en) * | 2018-09-15 | 2019-01-08 | 天津大学 | The combination processing method that nitrogen P elements recycle in urine waste water based on charcoal |
| 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 |
| CN109609970B (en) * | 2018-12-21 | 2021-02-26 | 北京林业大学 | System and method for promoting recovery of potassium in urine wastewater through magnesium anode electro-corrosion |
| CN110256174A (en) * | 2019-07-25 | 2019-09-20 | 安徽农业大学 | A kind of preparation method and application for the biological charcoal slow-release fertilizer being passivated heavy metal-polluted soil |
| CN110754665A (en) * | 2019-10-30 | 2020-02-07 | 南宁学院 | Method for extracting potassium element from beef tripe |
Citations (3)
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| CN102775236A (en) * | 2012-08-17 | 2012-11-14 | 中国科学院广州能源研究所 | Agricultural and forestry waste carbon-based slow release filter and preparation method thereof |
| CN104258812A (en) * | 2014-10-24 | 2015-01-07 | 江苏省农业科学院 | Metal element improved biochar-based nitrate radical adsorbent and preparation method thereof |
| CN104973919A (en) * | 2014-04-11 | 2015-10-14 | 清华大学 | Method of recycling nitrogen and phosphorus in urine to prepare slow-release fertilizer |
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| CN102775236A (en) * | 2012-08-17 | 2012-11-14 | 中国科学院广州能源研究所 | Agricultural and forestry waste carbon-based slow release filter and preparation method thereof |
| CN104973919A (en) * | 2014-04-11 | 2015-10-14 | 清华大学 | Method of recycling nitrogen and phosphorus in urine to prepare slow-release fertilizer |
| CN104258812A (en) * | 2014-10-24 | 2015-01-07 | 江苏省农业科学院 | Metal element improved biochar-based nitrate radical adsorbent and preparation method thereof |
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