CN113287485A - Organic-inorganic compound nutrient soil and preparation method thereof - Google Patents
Organic-inorganic compound nutrient soil and preparation method thereof Download PDFInfo
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- CN113287485A CN113287485A CN202110616312.5A CN202110616312A CN113287485A CN 113287485 A CN113287485 A CN 113287485A CN 202110616312 A CN202110616312 A CN 202110616312A CN 113287485 A CN113287485 A CN 113287485A
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- 235000015097 nutrients Nutrition 0.000 title claims abstract description 118
- 239000002689 soil Substances 0.000 title claims abstract description 115
- 229910010272 inorganic material Inorganic materials 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000010802 sludge Substances 0.000 claims abstract description 39
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000004202 carbamide Substances 0.000 claims abstract description 18
- 229910052939 potassium sulfate Inorganic materials 0.000 claims abstract description 15
- 239000004927 clay Substances 0.000 claims abstract description 14
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims abstract description 14
- 235000011151 potassium sulphates Nutrition 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 44
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 22
- 229910052757 nitrogen Inorganic materials 0.000 claims description 22
- 229910052698 phosphorus Inorganic materials 0.000 claims description 22
- 239000011574 phosphorus Substances 0.000 claims description 22
- 239000000203 mixture Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 16
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 14
- 238000001816 cooling Methods 0.000 claims description 14
- 239000011591 potassium Substances 0.000 claims description 14
- 229910052700 potassium Inorganic materials 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000008187 granular material Substances 0.000 claims description 8
- 238000012216 screening Methods 0.000 claims description 8
- 238000004806 packaging method and process Methods 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 4
- 125000001477 organic nitrogen group Chemical group 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 2
- 239000002881 soil fertilizer Substances 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract 1
- 239000000047 product Substances 0.000 description 29
- 239000003337 fertilizer Substances 0.000 description 22
- 235000013877 carbamide Nutrition 0.000 description 14
- 239000005416 organic matter Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000002131 composite material Substances 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 238000012545 processing Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000011651 chromium Substances 0.000 description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 4
- 229910052785 arsenic Inorganic materials 0.000 description 4
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 229910052793 cadmium Inorganic materials 0.000 description 4
- 229910052804 chromium Inorganic materials 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 4
- 229910052753 mercury Inorganic materials 0.000 description 4
- 238000012797 qualification Methods 0.000 description 4
- 239000002994 raw material Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 229910001385 heavy metal Inorganic materials 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 239000000618 nitrogen fertilizer Substances 0.000 description 3
- 239000003895 organic fertilizer Substances 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- ATRRKUHOCOJYRX-UHFFFAOYSA-N Ammonium bicarbonate Chemical compound [NH4+].OC([O-])=O ATRRKUHOCOJYRX-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000001099 ammonium carbonate Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 150000002894 organic compounds Chemical class 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- QJZYHAIUNVAGQP-UHFFFAOYSA-N 3-nitrobicyclo[2.2.1]hept-5-ene-2,3-dicarboxylic acid Chemical compound C1C2C=CC1C(C(=O)O)C2(C(O)=O)[N+]([O-])=O QJZYHAIUNVAGQP-UHFFFAOYSA-N 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 description 1
- 241000244203 Caenorhabditis elegans Species 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 1
- NPYPAHLBTDXSSS-UHFFFAOYSA-N Potassium ion Chemical compound [K+] NPYPAHLBTDXSSS-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 108010046334 Urease Proteins 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- PZZYQPZGQPZBDN-UHFFFAOYSA-N aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 description 1
- 235000012501 ammonium carbonate Nutrition 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000037208 balanced nutrition Effects 0.000 description 1
- 235000019046 balanced nutrition Nutrition 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 125000005521 carbonamide group Chemical group 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 235000013601 eggs Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004720 fertilization Effects 0.000 description 1
- 239000004021 humic acid Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000016709 nutrition Nutrition 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229940072033 potash Drugs 0.000 description 1
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 1
- 235000015320 potassium carbonate Nutrition 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/30—Growth substrates; Culture media; Apparatus or methods therefor based on or containing synthetic organic compounds
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/10—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material
- A01G24/12—Growth substrates; Culture media; Apparatus or methods therefor based on or containing inorganic material containing soil minerals
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G24/00—Growth substrates; Culture media; Apparatus or methods therefor
- A01G24/20—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material
-
- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C9/00—Fertilisers containing urea or urea compounds
-
- 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
- C05G3/40—Mixtures of one or more fertilisers with additives not having a specially fertilising activity for affecting fertiliser dosage or release rate; for affecting solubility
-
- 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
Abstract
The invention belongs to the technical field of resource utilization of urban domestic sludge and soil fertilizers, and discloses organic-inorganic compound nutrient soil and a preparation method thereof. The organic-inorganic compound nutrient soil comprises 4 wt% -10 wt% of urea, 5 wt% -10 wt% of potassium sulfate, 15 wt% -20 wt% of clay and 65 wt% -75 wt% of organic nutrient soil by total weight of the organic-inorganic compound nutrient soil. The method for preparing the organic-inorganic compound nutrient soil product by using the urban domestic sludge as the main material expands the diversified application of the urban sludge product, improves the high added value of the urban sludge product and realizes the recycling of the urban sludge product.
Description
Technical Field
The invention belongs to the technical field of resource utilization of urban domestic sludge and soil fertilizers, and particularly relates to organic-inorganic compound nutrient soil and a preparation method thereof.
Background
Urban domestic sludge is a byproduct of water treatment processes in urban sewage treatment plants, and generally has relatively stable and excellent quality due to the fact that the urban domestic sludge is mainly from urban living sources. The urban domestic sludge is rich in a large amount of organic matters, nitrogen, phosphorus, amino acids, trace elements and other nutrient substances, has the natural attributes of a carbon warehouse and a nutrient warehouse, belongs to a novel substance with the efficacy of organic fertilizers, and has huge potential application in the land utilization direction after harmless and stable treatment.
From the aspect of functionality, the organic matter improving effect of the pure town sludge product on the land utilization effect is more obvious, the release of nitrogen and phosphorus nutrients needs to be slowly carried out through the soil mineralization, and the nutrient supply efficiency is obviously lower than that of a chemical fertilizer. Meanwhile, the nutrient structure proportion of nitrogen, phosphorus and potassium in the pure town sludge product is also a key factor for limiting land utilization, the proportion of total phosphorus in the pure town sludge product is usually the highest, the total nitrogen is only about 0.3-0.5 times of the total phosphorus, and the potassium is very low. The organic-inorganic compound fertilizer (GB/T18877-. The composition of the urban domestic sludge is similar to the characteristics of limited organic materials in organic-inorganic compound fertilizers (GB/T18877-2020), the replaceability is strong, and meanwhile, the scheme and the application case for processing organic-inorganic compound products by using the urban domestic sludge as raw materials are lacked in the existing patent case.
Therefore, a preparation method for producing organic-inorganic compound nutrient soil by using urban domestic sludge and organic-inorganic compound nutrient soil comprising urban domestic sludge are urgently needed to be provided.
Disclosure of Invention
The invention aims to provide an organic-inorganic compound nutrient soil and a preparation method thereof aiming at the defects of the prior art. According to the invention, by utilizing an organic fertilizer processing technology and a scientific formula, the nutritional structure of a pure town sludge product (the organic nutrient soil) is improved, so that main quality indexes including nutrient indexes, heavy metal indexes and hygiene indexes can meet the relevant requirements of an organic-inorganic compound fertilizer (GB/T18877 plus 2020) type I product, the organic-inorganic compound nutrient soil product taking the town domestic sludge as a main material is prepared, the diversified application of the town sludge product is expanded, the high added value of the town sludge product is improved, and the resource utilization of the town sludge product is realized.
In order to achieve the above object, the present invention provides, in one aspect, an organic-inorganic composite nutrient soil, including, by weight, 4% to 10% of urea, 5% to 10% of potassium sulfate, 15% to 20% of clay, and 65% to 75% of organic nutrient soil, based on the total weight of the organic-inorganic composite nutrient soil.
The invention also provides a preparation method of the organic-inorganic compound nutrient soil, which comprises the following steps:
s1: crushing the organic nutrient soil into powder, and uniformly stirring and mixing the powder with the urea, the potassium sulfate and the clay to obtain a mixture;
s2: and preparing the mixture into granules or strips, and sequentially drying, cooling, screening and packaging to obtain the organic-inorganic compound nutrient soil.
The technical scheme of the invention has the following beneficial effects:
1. the main part of raw materials of the product is organic nutrient soil prepared by processing urban domestic sludge, and the resource attributes of the urban domestic sludge are fully utilized, so that the beneficial resource effects of the urban domestic sludge are exerted.
2. The organic nutrient soil in the organic-inorganic compound nutrient soil is used as a pure town sludge product, has universality in application range, mainly takes soil fertilization as an effect, has an obvious effect of improving the soil and has long fertilizer efficiency period. The organic-inorganic compound nutrient soil produced by the invention has similar efficacy of organic-inorganic compound fertilizer (GB/T18877-.
3. The organic nutrient soil in the organic-inorganic compound nutrient soil is used as a pure town sludge product, and generally has the characteristics of high phosphorus, low nitrogen and less potassium. The nitrogen, phosphorus and potassium in the organic-inorganic compound nutrient soil produced by the invention meet the requirement that the single nutrient specified in organic-inorganic compound fertilizer (GB/T18877-.
4. The organic-inorganic compound nutrient soil produced by the invention is rich in natural organic matters produced by human life, is not organic matter content achieved by artificially adding mineral humic acid, is more beneficial to the decomposition of microorganisms and the release of nutrients after soil application, and has good effects of fertilizing and improving soil after long-term application.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention provides organic-inorganic compound nutrient soil, which comprises 4 wt% -10 wt% of urea, 5 wt% -10 wt% of potassium sulfate, 15 wt% -20 wt% of clay and 65 wt% -75 wt% of organic nutrient soil by total weight of the organic-inorganic compound nutrient soil.
According to the invention, preferably, the organic-inorganic compound nutrient soil comprises 7 wt% -10 wt% of urea, 5 wt% -10 wt% of potassium sulfate, 15 wt% -20 wt% of clay and 68 wt% -70 wt% of organic nutrient soil, based on the total weight of the organic-inorganic compound nutrient soil.
In the present invention, urea, also called carbonamide (carbamide), is an organic compound consisting of carbon, nitrogen, oxygen and hydrogen, which is a white crystal with a chemical formula of CH4N2O, nitrogen content about 46.67%, density 1.335g/cm3Melting point 132.7 deg.C, and is soluble in water and alcohol, and insoluble in ether and chloroform. Is alkalescent. Urea is a high-concentration nitrogen fertilizer, belongs to a neutral quick-acting fertilizer, and can also be used for producing various compound fertilizers. As a neutral fertilizer, urea is suitable for various soils and plants. It is easy to preserve, convenient to use, and has little destructive effect on soil, and is a chemical nitrogen fertilizer with larger use amount at present. Urea is an organic nitrogen fertilizer, and can be absorbed and utilized by crops after being hydrolyzed into ammonium carbonate or ammonium bicarbonate under the action of urease in soil.
In the present invention, potassium sulfate: a salt of sulfate ion and potassium ion of the formula K2SO4Usually colorless or white crystals, granules or powders, odorless, chemically inert, stable in air, and having a density of 2.66g/cm3The melting point is 1069 ℃, the aqueous solution is neutral, and the fertilizer is a common potash fertilizer in agriculture, and the potassium content is about 50 percent.
In the invention, the clay: is a plastic aluminium silicate with very small particles (<2 μm). Is an important mineral raw material. Clays are generally formed from silicate minerals after weathering on the earth's surface. The clay mineral has plasticity after being wetted by water, can deform under a small pressure and can keep the original shape for a long time, and has a large specific surface area and electronegativity on particles, so that the clay mineral has good physical adsorption and surface chemical activity and has the capacity of exchanging with other cations.
According to the invention, preferably, the device for preparing the organic nutrient soil is a system for preparing the organic nutrient soil from urban domestic sludge;
the organic nutrient soil generally comprises 35-40% of organic matters, 2-3.5% of total nitrogen, 6-8% of total phosphorus and 0.3-0.7% of total potassium by total weight of the organic nutrient soil;
based on the total weight of the total nitrogen, the total nitrogen comprises 90-95% of organic nitrogen;
the total phosphorus comprises 50-55% of organic phosphorus based on the total weight of the total phosphorus.
In the invention, the system for preparing the organic nutrient soil from the urban domestic sludge refers to a system for preparing the organic nutrient soil from the urban domestic sludge disclosed in patent application No. 202022056357.5. The harmless and stabilized organic nutrient soil product prepared from the urban domestic sludge produced by the system has the characteristics of high organic matter content and rich nitrogen and phosphorus, and comprises 35-40% of organic matter, 2-3.5% of total nitrogen, 6-8% of total phosphorus and 0.3-0.7% of total potassium, and other quality indexes meet requirements of advanced anaerobic digestion of sludge to prepare organic nutrient soil (Q/BDG 45045-2017). The organic-inorganic compound nutrient soil is used as a main raw material, an agricultural organic fertilizer processing technology is utilized, an inorganic fertilizer is added, an organic-inorganic compound nutrient soil product with balanced nutrition and remarkable effect is prepared, the resource utilization of a sludge product is facilitated, the diversified application of the product is also facilitated, and the multi-win situation of environmental benefit, social benefit and economic benefit can be realized.
According to the invention, preferably, the organic-inorganic compound nutrient soil is granular or strip-shaped, the granularity is 2-5mm, and the water content is less than or equal to 30%.
The invention also provides a preparation method of the organic-inorganic compound nutrient soil, which comprises the following steps:
s1: crushing the organic nutrient soil into powder, and uniformly stirring and mixing the powder with the urea, the potassium sulfate and the clay to obtain a mixture;
s2: and preparing the mixture into granules or strips, and sequentially drying, cooling, screening and packaging to obtain the organic-inorganic compound nutrient soil.
According to the invention, preferably, the organic nutrient soil is crushed into powder by a crusher, and the particle size of the crushed organic nutrient soil is less than 3 mm.
According to the invention, preferably, the mixture is made into granules or strips by a granulator by using the traditional organic fertilizer processing technology, and the granularity of the granules is 2-5 mm. The granulator is not limited, and common granulation equipment for processing organic fertilizers, such as a flat-die extrusion granulator, a pair-roller extrusion granulator, a disc granulator, a stirring-tooth granulator and the like, which are well known to persons skilled in the art, can realize the granulation.
According to the invention, preferably, the drying treatment is that the organic-inorganic compound nutrient soil with the granularity of 2-5mm is subjected to moisture reduction by using drying equipment and is dried until the moisture content is less than or equal to 30%. In the invention, different drying energy sources and different drying forms can be adopted, and the target water content can be achieved. Preferably, the apparatus for performing the drying process includes a drying drum, and the conditions of the drying process include: the air inlet temperature is 200 ℃ and 250 ℃, the air outlet temperature is 80-50 ℃, and the drying time is 20-30 min.
In the invention, the moisture of the granular or strip mixture is reduced through drying treatment, so that the granular or strip mixture has certain stability.
According to the present invention, preferably, the apparatus for performing the cooling treatment includes a cooling cylinder, and the cooling treatment includes cooling the mixture to room temperature.
According to the invention, the apparatus for carrying out the screening process preferably comprises a screening net of 2-5 mm. And (3) conveying the oversize products to a packaging machine for packaging through a 2-5mm screening net by a conveyor, and conveying the undersize products to mixing equipment by the conveyor.
The method also comprises the step of sending the organic-inorganic compound nutrient soil to a local detection unit with fertilizer quality inspection qualification, wherein the quality of the organic-inorganic compound nutrient soil product refers to nutrient, organic matter, heavy metal indexes and hygiene indexes of an organic-inorganic compound fertilizer (GB/T18877-.
The present invention is specifically illustrated by the following examples.
Example 1
The embodiment provides organic-inorganic compound nutrient soil, which comprises 7 wt% of urea, 5 wt% of potassium sulfate, 20 wt% of clay and 68 wt% of organic nutrient soil, based on the total weight of the organic-inorganic compound nutrient soil.
The organic nutrient soil is from a sludge treatment center belonging to the limited responsibility company of Beijing urban drainage group, and the device for preparing the organic nutrient soil is a system for preparing the organic nutrient soil from urban domestic sludge disclosed in the patent application No. 202022056357.5.
The preparation method of the organic-inorganic compound nutrient soil comprises the following steps:
s1: crushing the organic nutrient soil into powder with the granularity of less than 3mm by a crusher, and uniformly stirring and mixing the powder with the urea, the potassium sulfate and the clay to obtain a mixture;
s2: making the mixture into granules with the particle size of 4-5mm by a flat die extrusion granulator;
s3: drying the granular mixture by using electric hot air through a drying cylinder, wherein the air inlet temperature is 200 ℃ and 250 ℃, the air outlet temperature is 80-50 ℃, and the time is 20-30 min;
s4: and cooling the dried granular mixture to room temperature through a cooling cylinder.
S5: and (3) enabling the granular mixture subjected to cooling treatment to pass through a 3mm screen, conveying oversize products to a packaging machine through a belt conveyor for packaging to obtain organic and inorganic compound nutrient soil products, and conveying undersize products to mixing equipment through the conveyor.
S6: randomly sampling and detecting the organic-inorganic compound nutrient soil product, and sending the product to a local detection unit with fertilizer quality inspection qualification, wherein the test quality is shown in table 1. The type I nutrient, heavy metal and hygienics index limit values of the organic-inorganic compound fertilizer (GB/T18877-2020) are shown in Table 2.
Table 1 test results of organic-inorganic composite nutrient soil prepared in example 1
| Index (I) | Mean value |
| Water content% | 16.4 |
| pH | 7.66 |
| Organic matter% | 22.2 |
| Total nitrogen% | 6.15 |
| Total phosphorus% | 4.65 |
| All potassium% | 4.41 |
| All-cadmium mg/kg | 0.562 |
| All chromium mg/kg | 46.9 |
| Total lead mg/kg | 13.3 |
| Total mercury mg/kg | 4.78 |
| Total arsenic mg/kg | 3.25 |
| Total copper mg/kg | 113 |
| All zinc mg/kg | 370.5 |
| All-nickel mg/kg | 40.8 |
| Death rate of ascarid eggs% | Not detected out |
| Faecal coliform value | ＞0.111 |
TABLE 2 organic-inorganic Compound Fertilizer (GB/T18877-2020) type I partial index limits
| Index (I) | Mean value |
| Organic matter content/%) | ≥20 |
| Total nutrient (N + P)2O5+K2O) content/% | ≥15 |
| PH value (pH value) | 5.5-8.5 |
| Cadmium and its compound content (in Cd)/(mg/kg) | ≤10 |
| Chromium and its compound content (in terms of Cr)/(mg/kg) | ≤500 |
| Lead and its compound content (in terms of Pb)/(mg/kg) | ≤150 |
| Mercury and its compound content (in Hg)/(mg/kg) | ≤5 |
| Arsenic and its compound content (As)/(mg/kg) | ≤50 |
| Mortality/percent of roundworm eggs | ≥95 |
| Faecal coliform count/(per gram) | ≤100 |
Example 2
This example provides an organic-inorganic composite nutrient soil [ high nitrogen type, nitrogen (N): phosphorus (P)2O5): potassium (K)2O)＝2:1:1]The organic-inorganic compound nutrient soil comprises, by weight, 10% of urea, 5% of potassium sulfate, 15% of clay and 70% of organic nutrient soil.
The organic nutrient soil is from a sludge treatment center belonging to the limited responsibility company of Beijing urban drainage group, and the device for preparing the organic nutrient soil is a system for preparing the organic nutrient soil from urban domestic sludge disclosed in the patent application No. 202022056357.5.
The preparation method of the organic-inorganic compound nutrient soil is the same as that of the example 1.
Randomly sampling and detecting the organic-inorganic compound nutrient soil product, and sending the product to a local detection unit with fertilizer quality inspection qualification, wherein the test quality is shown in table 3.
Table 3 test results of organic-inorganic composite nutrient soil prepared in example 2
| Index (I) | Mean value |
| Water content% | 18.6 |
| pH | 7.81 |
| Organic matter% | 20.8 |
| Total nitrogen% | 8.67 |
| Total phosphorus% | 4.37 |
| All potassium% | 4.21 |
| All-cadmium mg/kg | 0.65 |
| All chromium mg/kg | 40.21 |
| Total lead mg/kg | 12.45 |
| Total mercury mg/kg | 4.29 |
| Total arsenic mg/kg | 3.18 |
| Total copper mg/kg | 105.9 |
| All zinc mg/kg | 340.9 |
| All-nickel mg/kg | 23.54 |
| Death rate of ascarid eggs% | Not detected out |
| Faecal coliform value | ＞0.111 |
Example 3
This example provides an organic-inorganic composite nutrient soil [ high potassium type, nitrogen (N):phosphorus (P)2O5): potassium (K)2O)＝1:1:2]The organic-inorganic compound nutrient soil comprises 4 wt% of urea, 10 wt% of potassium sulfate, 15 wt% of clay and 70 wt% of organic nutrient soil by total weight of the organic-inorganic compound nutrient soil.
The organic nutrient soil is from a sludge treatment center belonging to the limited responsibility company of Beijing urban drainage group, and the device for preparing the organic nutrient soil is a system for preparing the organic nutrient soil from urban domestic sludge disclosed in the patent application No. 202022056357.5.
The preparation method of the organic-inorganic compound nutrient soil is the same as that of the example 1.
Randomly sampling and detecting the organic-inorganic compound nutrient soil product, and sending the product to a local detection unit with fertilizer quality inspection qualification, wherein the test quality is shown in table 4.
Table 4 test results of organic-inorganic composite nutrient soil prepared in example 3
| Index (I) | Mean value |
| Water content% | 19.2 |
| pH | 7.69 |
| Organic matter% | 21.1 |
| Total nitrogen% | 4.47 |
| Total phosphorus% | 4.44 |
| All potassium% | 8.27 |
| All-cadmium mg/kg | 0.66 |
| All chromium mg/kg | 40.84 |
| Total lead mg/kg | 12.65 |
| Total mercury mg/kg | 4.35 |
| Total arsenic mg/kg | 3.23 |
| Total copper mg/kg | 107.6 |
| All zinc mg/kg | 346.23 |
| All-nickel mg/kg | 23.9 |
| Death rate of ascarid eggs% | Not detected out |
| Faecal coliform value | ＞0.111 |
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. The organic-inorganic compound nutrient soil is characterized by comprising 4-10 wt% of urea, 5-10 wt% of potassium sulfate, 15-20 wt% of clay and 65-75 wt% of organic nutrient soil by weight of the total weight of the organic-inorganic compound nutrient soil.
2. The organic-inorganic compound nutrient soil as claimed in claim 1, wherein the organic-inorganic compound nutrient soil comprises 7 wt% -10 wt% of urea, 5 wt% -10 wt% of potassium sulfate, 15 wt% -20 wt% of clay and 68 wt% -70 wt% of organic nutrient soil, based on the total weight of the organic-inorganic compound nutrient soil.
3. The organic-inorganic compound nutrient soil as claimed in claim 2, wherein,
the device for preparing the organic nutrient soil is a system for preparing the organic nutrient soil from urban domestic sludge;
based on the total weight of the organic nutrient soil, the organic nutrient soil comprises 35-40% of organic matters, 2-3.5% of total nitrogen, 6-8% of total phosphorus and 0.3-0.7% of total potassium;
based on the total weight of the total nitrogen, the total nitrogen comprises 90-95% of organic nitrogen;
the total phosphorus comprises 50-55% of organic phosphorus based on the total weight of the total phosphorus.
4. The organic-inorganic compound nutrient soil as claimed in any one of claims 1 to 3, wherein the organic-inorganic compound nutrient soil is in the form of granules or strips, the granularity is 2-5mm, and the water content is less than or equal to 30%.
5. The method for preparing the organic-inorganic compound nutrient soil according to any one of claims 1 to 4, characterized by comprising the following steps:
s1: crushing the organic nutrient soil into powder, and uniformly stirring and mixing the powder with the urea, the potassium sulfate and the clay to obtain a mixture;
s2: and preparing the mixture into granules or strips, and sequentially drying, cooling, screening and packaging to obtain the organic-inorganic compound nutrient soil.
6. The method for preparing organic-inorganic compound nutrient soil as claimed in claim 5, wherein the organic nutrient soil is crushed into powder by a crusher, and the particle size of the crushed organic nutrient soil is less than 3 mm.
7. The method for preparing organic-inorganic compound nutrient soil as claimed in claim 5, wherein the mixture is pelletized or stripped by a pelletizer, and the grain size is 2-5 mm.
8. The preparation method of the organic-inorganic compound nutrient soil as claimed in claim 5, wherein the drying treatment is to reduce the water content of the organic-inorganic compound nutrient soil with the particle size of 2-5mm by using drying equipment until the water content is less than or equal to 30%.
9. The method for preparing organic-inorganic compound nutrient soil according to claim 5, wherein the equipment for performing the cooling treatment comprises a cooling cylinder, and the cooling treatment comprises cooling the mixture to room temperature.
10. The method for preparing organic-inorganic compound nutrient soil as claimed in claim 5, wherein the equipment for carrying out the screening treatment comprises a 2-5mm screening net.
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