CN108901749B - Cultivation soil prepared from municipal sludge and preparation method thereof - Google Patents
Cultivation soil prepared from municipal sludge and preparation method thereof Download PDFInfo
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- CN108901749B CN108901749B CN201810738754.5A CN201810738754A CN108901749B CN 108901749 B CN108901749 B CN 108901749B CN 201810738754 A CN201810738754 A CN 201810738754A CN 108901749 B CN108901749 B CN 108901749B
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- 230000003647 oxidation Effects 0.000 claims abstract description 64
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- 238000000034 method Methods 0.000 claims description 16
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- 238000010438 heat treatment Methods 0.000 claims description 14
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- 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
- A01G24/10—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
- A01G24/15—Calcined rock, e.g. perlite, vermiculite or clay aggregates
-
- 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
- A01G24/28—Growth substrates; Culture media; Apparatus or methods therefor based on or containing natural organic material containing peat, moss or sphagnum
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- 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
- A01G24/40—Growth substrates; Culture media; Apparatus or methods therefor characterised by their structure
- A01G24/42—Growth substrates; Culture media; Apparatus or methods therefor characterised by their structure of granular or aggregated structure
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- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Soil Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Fertilizers (AREA)
- Cultivation Of Plants (AREA)
Abstract
The invention relates to the field of environment-friendly treatment of municipal sludge, in particular to cultivation soil prepared from municipal sludge and a preparation method thereof, which comprises a mixture prepared by mixing sludge materials, granular materials and decomposed materials, the sludge material comprises solid powder extracted from municipal sludge after liquid phase oxidation treatment, the granular material comprises granular material with water absorption function, the preparation method of the culture soil is simpler, the traditional dehydration treatment step of the municipal sludge is reduced, and because the urban sludge is subjected to liquid phase oxidation treatment, the prepared cultivation soil has low heavy metal content, microorganisms and organic matters are thoroughly decomposed, bacteria and viruses are thoroughly killed, and the prepared cultivation soil has good air permeability and water retention by matching with granular materials and decomposed soil as raw materials, can avoid water and soil loss, is suitable for the growth of plants, and provides a good way for the economic and environment-friendly resource utilization of municipal sludge.
Description
Technical Field
The invention relates to the field of environment-friendly treatment of municipal sludge, in particular to cultivation soil prepared from municipal sludge and a preparation method thereof.
Background
With the increasing population and the increasing urbanization of global society, the output of urban domestic sewage is larger and larger, the sludge as a byproduct of urban sewage treatment is more and more, the sewage sludge is a thick substance between liquid and solid and is rich in various microorganisms, inorganic particles, humus and heavy metals, wherein the microorganisms mainly comprise protein, polysaccharide, nucleic acid and the like, can secrete a large amount of polysaccharide substances and are mixed in the sludge in a mucus state, so that the sludge generated by the domestic sewage treatment is not easy to separate the moisture in the sludge by physical modes of adding medicines, extruding and the like, the land utilization is a recognized resource approach with the shortest route and the largest sludge digestion amount, and the wet sludge generated by the urban domestic sewage treatment at present is mainly treated by treatment modes of composting, anaerobic fermentation, pyrohydrolysis, earthworm digestion and the like to reduce the content of organic matters, and (5) land utilization is carried out.
However, the above-mentioned treatment method of municipal sludge is not able to completely eliminate viruses and bacterial spores in the sludge due to the low temperature of the whole treatment method, and does not separate heavy metal substances in the sludge, so that the viruses, bacterial spores and heavy metal substances remaining in the sludge affect the growth of plants, and at the same time, organic substances remaining in the sludge are decomposed and oxidized by natural microorganisms, giving off unpleasant odor, and further affecting the resource utilization of the sludge, although the existing treatment methods such as incineration, high-temperature carbonization, etc. can rapidly remove the organic substances in the municipal sludge to achieve the harmlessness of the municipal sludge, but the energy consumption is high, the investment is large, and the components beneficial to the land utilization in the municipal sludge are consumed completely, which is not beneficial to the resource utilization of the municipal sludge, on the other hand, the solid particles contained in the sludge are generally 10-200 μm, when the fertilizer is used for plant cultivation, soil hardening is easily caused due to small granularity, normal growth of plants is not facilitated, and resource land utilization of municipal sludge is also not facilitated.
In summary, there is an urgent need for a technical solution to solve the technical problems that when sludge generated by the existing municipal sewage treatment is used in land, viruses, bacterial spores, heavy metals and organic matters remained in the sludge affect the growth of plants, and the solid particle size of the municipal sludge is relatively small, which is not favorable for the resource land utilization of the municipal sludge.
Disclosure of Invention
The invention aims to: aiming at the technical problems that when sludge generated by the existing municipal domestic sewage treatment is used in land, viruses, bacterial sporophytes, heavy metals and organic matters remained in the sludge influence the growth of plants, and the solid granularity of the municipal sludge is relatively fine, which is not beneficial to the resource land utilization of the municipal sludge, the cultivating soil prepared by utilizing the municipal sludge and the preparation method thereof are provided.
In order to achieve the purpose, the invention adopts the technical scheme that:
the cultivating soil prepared from the municipal sludge comprises a mixture prepared by mixing sludge materials, granular materials and decomposed materials, wherein the sludge materials comprise solid powder extracted from the municipal sludge after liquid-phase oxidation treatment, and the granular materials comprise granular materials with a water absorption function.
The cultivating soil prepared by utilizing the municipal sludge provides an economic and environment-friendly treatment and utilization approach for the resource treatment of the municipal sludge, meanwhile, the cultivating soil is prepared by adopting the sludge material, the granular material and the decomposed soil, the pores in the prepared cultivating soil are increased through the granular characteristics of the granular material, so that the cultivating soil has better air permeability, the growth of plants is promoted, and through the water absorption function of the granular materials, the water retention of the cultivation soil is better, the water loss of the cultivation soil is avoided, the growth of plants is further promoted, meanwhile, the contents of nitrogen, phosphorus and humus in the prepared cultivated soil are further increased through the humus soil, so that the prepared cultivated soil is suitable for the growth of plants, and because the content of the fiber in the humus soil is more, the dispersion of fine particles of sludge and particles is avoided, the loss of the cultivated soil along with the erosion of rainwater is avoided, and the water and soil loss is avoided.
More preferably, as the municipal sludge is subjected to liquid-phase oxidation treatment, most of heavy metals in the sludge stay in the oxidation liquid for oxidation treatment and are removed through solid-liquid separation, the content of the heavy metals in the prepared sludge is less, the reduction of the content of the heavy metals in the prepared cultivation soil is facilitated, the cultivation soil is suitable for the growth of plants, and the influence of the cultivation soil on the environment is also reduced.
More preferably, as the sludge material is subjected to strong oxidative liquid-phase oxidation treatment, viruses and bacterial spores in the municipal sludge are thoroughly decomposed into the oxidation liquid for the oxidation treatment, the sterilization effect is better, and the prepared cultivation soil is further suitable for the growth of plants and is beneficial to the harmless land utilization of the municipal sludge.
More preferably, as the sludge material is prepared from the municipal sludge through oxidation reaction, microorganisms and organic matters in the municipal sludge are thoroughly decomposed, the situation that the culture soil is rotted and deteriorated due to the influence of the microorganisms in the use process of the sludge material is avoided, the seedling burning and root rotting of the plants are caused, and the prepared culture soil is further suitable for the growth of the plants.
Preferably, the granular material comprises granular materials prepared from ceramsite and/or ore, and the decomposed soil comprises peat soil and/or leaf-rotting soil and/or decomposed straw soil. According to the actual conditions, one or more of ceramsite or ore can be adopted to prepare the granular material, the source is wide, the preparation is convenient, the water retention effect is good, the pores and the water content in the cultivation soil are increased, and meanwhile, according to the actual conditions, one or more of peat soil, leaf rotting soil or rotted straw soil can be adopted to prepare the rotted soil, so that a good way is provided for the environment-friendly economic utilization of agricultural straws, and the plant fibers in the prepared cultivation soil and elements beneficial to plant growth can be increased.
Preferably, the liquid-phase oxidation treatment comprises wet oxidation and/or fenton oxidation and/or ozone oxidation and/or hydrogen peroxide oxidation. According to the practical situation, one or more liquid-phase oxidation treatment modes are adopted to treat the municipal sludge, the municipal sludge can be directly put into the oxidation liquid for liquid-phase oxidation treatment without complex dehydration treatment, and the steps in resource utilization of the municipal sludge are reduced.
Preferably, the liquid-phase oxidation treatment comprises a combination of an oxidation treatment and a thermal hydrolysis and/or alkaline hydrolysis and/or ultrasonic treatment, wherein the oxidation treatment comprises a wet oxidation and/or a fenton oxidation and/or an ozone oxidation and/or a hydrogen peroxide oxidation. According to the actual situation, one or more of thermal hydrolysis, alkaline hydrolysis and ultrasonic treatment are adopted to jointly act with wet oxidation and/or Fenton oxidation and/or ozone oxidation and/or hydrogen peroxide oxidation of liquid-phase oxidation treatment, so that the sterilization effect of the sludge is improved, the dispersion of heavy metals in the sludge into liquid of the liquid-phase oxidation treatment is accelerated, the harmless degree of the prepared sludge material is higher, and the whole time for preparing the sludge material is also reduced.
Preferably, the mixture comprises the following raw materials in parts by weight: 40-90 parts of sludge material, 10-30 parts of granular material and 10-20 parts of humus soil. The weight parts of the raw material components can be adjusted according to actual conditions, so that the cultivation soil with different water permeability and different nutrient elements can be prepared, and the application range of the cultivation soil is wider.
Preferably, the mixture comprises the following raw materials in parts by weight: 80-90 parts of sludge material, 20-30 parts of granular material and 15-20 parts of humus soil. The mixture adopts more sludge materials, so that the consumption of the culture soil to the municipal sludge is larger, and a better way is provided for the harmless resource utilization of the municipal sludge.
Preferably, the mixture comprises the following raw materials in parts by weight: 85 parts of sludge material, 25 parts of granular material and 15 parts of decomposed soil. The cultivation soil prepared by the proportion has good water permeability, is not easy to lose water and soil, is rich in substances suitable for plant growth, such as nitrogen, phosphorus, humus and the like, and has good use effect.
A preparation method of cultivation soil prepared by using municipal sludge comprises the following steps: step 1: preparing sludge material: sequentially carrying out liquid-phase oxidation treatment, solid-liquid separation treatment and solid-phase drying treatment on municipal sludge to obtain the sludge material, wherein the water content of the sludge material is 10-60%; step 2: preparing a granular material: sequentially crushing and screening ceramsite and/or ore to obtain the granular material; and step 3: preparing the humus soil: sequentially crushing, stirring, decomposing and fermenting fallen leaves and/or straws and/or peat to obtain the decomposed soil; and 4, step 4: mixing and stirring: and mixing the sludge material, the granular material and the decomposed soil according to a proportion, and uniformly stirring to obtain the mixture.
The preparation method of the cultivating soil prepared by utilizing the municipal sludge is simple, the cultivating soil can be directly put into the oxidizing liquid for liquid-phase oxidation treatment for oxidation treatment without complex dehydration treatment on the municipal sludge, the steps and time in the municipal sludge treatment process are reduced, the recycling of the municipal sludge is more convenient, the consumption of manpower and material resources for the municipal sludge treatment is reduced, and an economic and environment-friendly utilization way is provided for the recycling of the municipal sludge.
Preferably, the decomposing fermentation in the step 3 is to adjust the water content of the crushed and stirred fallen leaves and/or straws and/or peat to 50-70%, and ferment for 3-6 months under anaerobic condition or ferment for 1-3 months under aerobic condition. According to different decomposed fermentation raw materials, anaerobic fermentation or aerobic fermentation is adopted, so that the effective components in the fallen leaves, the straws or the peat are fully decomposed into nutrient elements which can be absorbed by plants, and the growth of the plants is promoted.
Preferably, step 5 is further provided after step 4: adjusting the water content: and adding water into the mixture, and uniformly stirring to obtain the cultivation soil suitable for plant growth. According to the actual conditions, water is added into the mixture prepared by the method to prepare the water-containing cultivation soil, so that the moisture content of the cultivation soil is higher, the cultivation soil is matched with the granular materials with the water absorption and retention functions, the prepared cultivation soil is more suitable for the growth of plants, and meanwhile, according to the actual conditions, water is added when the cultivation soil is used to adjust the moisture content, so that the cultivation soil with the lower moisture content is not easy to deteriorate in the storage process, and the cultivation soil is convenient to use and store.
Preferably, the step 1 comprises the following steps: step 1.1: preparing sludge mixed liquor: adding water into the sludge and stirring to prepare a flowable sludge mixed solution; step 1.2: heating treatment: heating the sludge mixed solution prepared in the step 1.1 at the heating temperature of 30-250 ℃, when a liquid oxidant is adopted, the heating temperature is 30-100 ℃, and when a gaseous oxidant is adopted, the heating temperature is 100-250 ℃; step 1.3: liquid-phase oxidation treatment: adding a liquid oxidant and/or introducing a gaseous oxidant into the sludge mixed liquor heated in the step 1.2, and carrying out heat preservation and pressure maintenance for carrying out an oxidation reaction, wherein the oxidation reaction time is 30min-150min, and the pressure maintenance pressure is 1MPa-2 MPa; step 1.4: solid-liquid separation treatment: extracting the solid part in the sludge mixed liquor treated in the step 1.3 by adopting centrifugal separation and/or membrane separation and/or filtration separation; step 1.5: solid phase drying treatment: and (3) drying the solid part extracted in the step (1.4), and adjusting the water content to 10% -60% to obtain the sludge material.
In conclusion, due to the adoption of the technical scheme, the cultivation soil prepared from the municipal sludge has the beneficial effects that:
1. provides an economic and environment-friendly treatment and utilization approach for the resource treatment of the municipal sludge;
2. the cultivating soil is prepared from the sludge material, the granular material and the decomposed soil, the pores in the prepared cultivating soil are increased through the granular characteristics of the granular material, so that the cultivating soil has better air permeability, the growth of plants is promoted, the water retention of the cultivating soil is better through the water absorption function of the granular material, the water loss of the cultivating soil is avoided, the growth of the plants is further promoted, meanwhile, the content of nitrogen, phosphorus and humus in the prepared cultivating soil is further increased through the decomposed soil, so that the prepared cultivating soil is suitable for the growth of the plants, and the fiber content in the decomposed soil is more, so that the dispersion of fine granules of the sludge material and the granular material is favorably avoided, the loss of the cultivating soil along with the erosion of rainwater is avoided, and the water and soil loss is avoided;
3. because the urban sludge is subjected to liquid-phase oxidation treatment, most heavy metals in the sludge stay in the oxidation liquid for oxidation treatment and are removed through solid-liquid separation, so that the content of the heavy metals in the prepared sludge is low, the content of the heavy metals in the prepared cultivation soil is reduced, the cultivation soil is suitable for the growth of plants, and the factors influencing the environment in the cultivation soil are also reduced;
4. as the sludge is subjected to strong-oxidizing liquid-phase oxidation treatment, viruses and bacterial spores in the municipal sludge are thoroughly decomposed into the oxidizing liquid for oxidation treatment, the sterilization effect is good, the prepared cultivated soil is further suitable for the growth of plants, and the harmless land utilization of the municipal sludge is facilitated;
5. because the sludge material is prepared from the municipal sludge through oxidation reaction, microorganisms and organic matters in the municipal sludge are thoroughly decomposed, the situation that the culture soil is rotted and deteriorated due to the influence of the microorganisms in the use process of the sludge material is avoided, the seedlings of the plants are burned, the roots of the plants are rotted, and the prepared culture soil is further suitable for the growth of the plants;
the preparation method of the cultivation soil prepared by utilizing the municipal sludge has the beneficial effects that:
the preparation method is simple, complex dehydration treatment and medicament addition are not needed to be carried out on the municipal sludge, and the municipal sludge can be directly put into the oxidizing liquid for liquid-phase oxidation treatment for oxidation treatment, so that the steps and time in the municipal sludge treatment process are reduced, the recycling of the municipal sludge is more convenient, and the consumption of manpower and material resources in the municipal sludge treatment is reduced.
Drawings
FIG. 1 is a schematic view showing a preparation process of a cultivation soil prepared by using municipal sludge according to the present invention;
FIG. 2 is a schematic view of the process for preparing the sludge material of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The cultivating soil prepared from the municipal sludge comprises a mixture prepared by mixing sludge materials, granular materials and decomposed materials, wherein the mixture comprises the following raw materials in parts by weight: the sludge comprises, by weight, 40-90 parts of sludge material, 10-30 parts of granular material and 10-20 parts of humus soil, wherein the sludge material comprises solid powder extracted from municipal sludge after liquid-phase oxidation treatment, and the water content of the sludge material is 10% -60%.
The cultivation soil prepared by the municipal sludge is subjected to harmless treatment through liquid-phase oxidation treatment, most heavy metals in the sludge are stopped in oxidation liquid for oxidation treatment and are removed through solid-liquid separation, the content of the heavy metals in the prepared cultivation soil is reduced, meanwhile, microorganisms and bacterial spores in the municipal sludge are thoroughly decomposed, harmful bacteria are thoroughly eliminated, and the harmless sludge material is prepared, is suitable for growth of garden plants and agricultural crops and is wide in application range.
Preferably, in the embodiment, one or more of light ceramsite, vermiculite and perlite is/are preferably adopted as the particle material after being crushed, the particle size range of the particle material is 0.2mm-1mm, the ceramsite is light in weight, good in water absorption and larger in size than fine particles in the sludge material, so that pores in the prepared cultivation soil can be better increased, the cultivation soil is good in air permeability and water retention and suitable for plant growth, the vermiculite and the perlite are used as ore materials and are not easily influenced by the external environment, and the particle material has a certain antibacterial effect, so that the soil performance is more stable, the particle material can be prepared by simultaneously mixing the ceramsite, the vermiculite and the perlite according to actual conditions, the prepared cultivation soil is suitable for growth of different plants, and the application range is wider.
Preferably, in this embodiment, one or more of peat, fallen leaves and plant straws are preferably used, and the rotten soil is prepared by rotten fermentation, wherein the rotten fermentation is to adjust the water content of the fallen leaves and/or straws and/or peat after crushing and stirring to 50% -70%, and ferment for 3-6 months under anaerobic conditions or ferment for 1-3 months under aerobic conditions. The decayed and fermented fallen leaves, straws or peat are rich in elements beneficial to plant growth, and the content of nitrogen, phosphorus and humus in the prepared cultivation soil is increased, so that the prepared cultivation soil is suitable for plant growth, and meanwhile, the decayed soil also correspondingly increases the fiber content in the prepared cultivation soil, thereby being beneficial to gathering fine particles of sludge and particles together, avoiding the cultivation soil from losing along with erosion of rainwater, avoiding water and soil loss, and making the cultivation soil which is rich in nutrition, good in water and soil flow resistance, good in effect of water retention and suitable for different plant growth.
Preferably, the liquid-phase oxidation treatment includes one or more of wet oxidation, fenton oxidation, ozone oxidation, and hydrogen peroxide oxidation. According to the actual conditions, one or more liquid-phase oxidation treatment modes are adopted to treat the municipal sludge, so that harmless sludge materials with stable performance are prepared, and meanwhile, the oxidation reaction can be directly carried out without dewatering the raw sludge of the municipal sludge due to the liquid-phase oxidation treatment of the municipal sludge, so that the steps in the resource utilization of the municipal sludge are reduced.
Example 2
The cultivation soil prepared by using the municipal sludge in the embodiment has the same raw material formula as that of the embodiment 1, and is different from the following components in that: in the embodiment, the sludge material is subjected to one or more of wet oxidation, fenton oxidation, ozone oxidation and hydrogen peroxide oxidation in combination with one or more of thermal hydrolysis, alkaline hydrolysis and ultrasonic treatment.
According to the cultivation soil prepared by using the municipal sludge, the municipal sludge is preferably treated by combining wet oxidation and ultrasonic treatment, the ultrasonic treatment is performed on the municipal sludge in the wet oxidation process, the heavy metals in the sludge are dispersed into the oxidation liquid of the liquid phase oxidation treatment, the heavy metals are easily removed through solid-liquid separation, the preparation of sludge materials is accelerated, and the harmless degree of the prepared sludge materials is higher.
Example 3
The cultivation soil prepared by using the municipal sludge in the embodiment has the same raw material formula as that of the embodiment 1, and is different from the following components in that: the mixture comprises the following raw materials in parts by weight: 80-90 parts of sludge material, 20-30 parts of granular material and 15-20 parts of decomposed soil, more preferably 85 parts of sludge material, 25 parts of granular material and 15 parts of decomposed soil.
The cultivation soil prepared by using the municipal sludge can adjust the weight parts of raw material components according to actual conditions, so that cultivation soil with different water permeability rates and different nutrient elements is prepared, the cultivation soil is wider in application range, the prepared cultivation soil is rich in substances suitable for plant growth, such as nitrogen, phosphorus, humus and the like, water and soil loss is not easy to occur, and the using effect is better.
Example 4
As shown in fig. 1-2, a method for preparing cultivation soil prepared by using municipal sludge includes the steps of: step 1: preparing sludge material: sequentially carrying out liquid-phase oxidation treatment, solid-liquid separation treatment and solid-phase drying treatment on the municipal sludge to obtain sludge material; step 2: preparing a granular material: sequentially crushing and screening ceramsite and/or ore to obtain the granular material; and step 3: preparing the humus soil: sequentially crushing, stirring, decomposing and fermenting fallen leaves and/or straws and/or peat to obtain the decomposed soil; and 4, step 4: mixing and stirring: mixing the sludge material, the granular material and the decomposed soil according to a proportion, and uniformly stirring to obtain a mixture, wherein the step 5: adjusting the water content: and adding water into the mixture, and uniformly stirring to obtain the cultivation soil suitable for plant growth.
The preparation method of the cultivating soil prepared by using the municipal sludge is simple, the cultivating soil can be directly put into the oxidizing liquid for liquid-phase oxidation treatment for oxidation treatment without complex dehydration treatment on the municipal sludge, the steps and time in the process of treating the municipal sludge are reduced, the recycling of the municipal sludge is more convenient, the consumption of manpower and material resources for treating the municipal sludge is reduced, an economic and environment-friendly utilization way is provided for the recycling of the municipal sludge, fallen leaves, straws, peat and slag, meanwhile, fertilizers or antibacterial agents for promoting plant growth can be added into the cultivating soil according to different plants and are prepared into different water contents, so that the cultivating soil with different water retention effects and different effects is prepared, and the application range is wider.
Preferably, the step 1 comprises the following steps: step 1.1: preparing sludge mixed liquor: adding water into the sludge and stirring to prepare a flowable sludge mixed solution; step 1.2: heating treatment: heating the sludge mixed solution prepared in the step 1.1 at the heating temperature of 30-250 ℃, when a liquid oxidant is adopted, the heating temperature is 30-100 ℃, and when a gaseous oxidant is adopted, the heating temperature is 100-250 ℃; step 1.3: liquid-phase oxidation treatment: adding a liquid oxidant and/or introducing a gaseous oxidant into the sludge mixed liquor heated in the step 1.2, and carrying out heat preservation and pressure maintenance for carrying out an oxidation reaction, wherein the oxidation reaction time is 30min-150min, and the pressure maintenance pressure is 1MPa-2 MPa; step 1.4: solid-liquid separation treatment: extracting the solid part in the sludge mixed liquor treated in the step 1.3 by adopting centrifugal separation and/or membrane separation and/or filtration separation; step 1.5: solid phase drying treatment: and (3) drying the solid part extracted in the step (1.4), and adjusting the water content to 10% -60% to obtain the sludge material. According to actual conditions, the solid part of the municipal sludge after being treated in the steps 1.1-1.4 is used as a raw material for preparing the culture soil for storage, when long-time storage is needed, the moisture in the sludge material is reduced through the step 1.5, so that the sludge material is stable in performance in the long-time storage process, when the solid part extracted in the step 1.4 is not needed to be stored and needs to be directly put into the preparation process for preparing the culture soil, the operation steps of the step 1.5 are reduced, and the harmless resource utilization of the municipal sludge is more convenient.
The above embodiments are only for illustrating the invention and not for limiting the technical solutions described in the invention, and although the present invention has been described in detail by referring to the above embodiments, the present invention is not limited to the above embodiments, and therefore, any modifications or equivalent substitutions may be made to the present invention, and all technical solutions and modifications without departing from the spirit and scope of the invention should be covered by the claims of the present invention.
Claims (2)
1. A method for preparing cultivation soil by using municipal sludge is characterized in that: the method comprises the following steps:
step 1: preparing sludge material: the sludge material comprises solid powder extracted from municipal sludge after liquid-phase oxidation treatment, the liquid-phase oxidation treatment comprises wet oxidation and/or Fenton oxidation and/or ozone oxidation and/or hydrogen peroxide oxidation, the municipal sludge is subjected to liquid-phase oxidation treatment, solid-liquid separation treatment and solid-phase drying treatment in sequence to obtain the sludge material, and the water content of the sludge material is 10-60%;
step 2: preparing a granular material: the granular material comprises granular materials with a water absorption function, the granular materials comprise granular materials prepared from ceramsite and ore, the granular materials are prepared by sequentially crushing and screening the ceramsite and the ore, and the particle size range of the granular materials is 0.2mm-1 mm;
and step 3: preparing the humus soil: the rotten soil comprises peat soil, leaf rotting soil and rotten straw soil, fallen leaves, straws and peat are sequentially crushed, stirred and fermented to obtain the rotten soil, and the rotten soil is prepared by adjusting the water content of the crushed and stirred fallen leaves, straws and peat to 50% -70% and fermenting for 3-6 months under an anaerobic condition or fermenting for 1-3 months under an aerobic condition;
and 4, step 4: mixing and stirring: mixing the sludge material, the granular material and the decomposed soil according to the proportion of 80-90 parts of the sludge material, 20-30 parts of the granular material and 15-20 parts of the decomposed soil, and uniformly stirring to obtain a mixture;
and 5: adjusting the water content: adding water into the mixture, and uniformly stirring to obtain the cultivation soil suitable for plant growth.
2. The method for preparing cultivation soil as claimed in claim 1, wherein: the step 1 comprises the following steps:
step 1.1: preparing sludge mixed liquor: adding water into the sludge and stirring to prepare a flowable sludge mixed solution;
step 1.2: heating treatment: heating the sludge mixed solution prepared in the step 1.1, wherein when a liquid oxidant is adopted, the heating temperature is 30-100 ℃, and when a gaseous oxidant is adopted, the heating temperature is 100-250 ℃;
step 1.3: liquid-phase oxidation treatment: adding a liquid oxidant and/or introducing a gaseous oxidant into the sludge mixed liquor heated in the step 1.2, and carrying out heat preservation and pressure maintenance for carrying out an oxidation reaction, wherein the oxidation reaction time is 30min-150min, and the pressure maintenance pressure is 1MPa-2 MPa;
step 1.4: solid-liquid separation treatment: extracting the solid part in the sludge mixed liquor treated in the step 1.3 by adopting centrifugal separation and/or membrane separation and/or filtration separation;
step 1.5: solid phase drying treatment: and (3) drying the solid part extracted in the step (1.4), and adjusting the water content to 10% -60% to obtain the sludge material.
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| CN102217469A (en) * | 2010-04-19 | 2011-10-19 | 陆振冈 | Organic cultivation medium and application method thereof |
| CN106495945A (en) * | 2016-11-01 | 2017-03-15 | 湖南恒凯环保科技投资有限公司 | A kind of method that utilization municipal sludge quickly prepares soil conditioner |
| CN106865938A (en) * | 2017-03-31 | 2017-06-20 | 彭丽 | A kind of processing method of sludge CWO |
| CN107056352A (en) * | 2017-06-07 | 2017-08-18 | 合肥申沃园艺有限公司 | The planting soil and its application method of a kind of utilization domestic waste production |
| CN107216209A (en) * | 2017-07-17 | 2017-09-29 | 河源市固体废物集中处置中心有限公司 | A kind of method that domestic sludge prepares Nutrition Soil |
| CN108094122A (en) * | 2017-12-29 | 2018-06-01 | 四川建筑职业技术学院 | A kind of formula of cultivated soil and the preparation method of the cultivated soil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102217469A (en) * | 2010-04-19 | 2011-10-19 | 陆振冈 | Organic cultivation medium and application method thereof |
| CN106495945A (en) * | 2016-11-01 | 2017-03-15 | 湖南恒凯环保科技投资有限公司 | A kind of method that utilization municipal sludge quickly prepares soil conditioner |
| CN106865938A (en) * | 2017-03-31 | 2017-06-20 | 彭丽 | A kind of processing method of sludge CWO |
| CN107056352A (en) * | 2017-06-07 | 2017-08-18 | 合肥申沃园艺有限公司 | The planting soil and its application method of a kind of utilization domestic waste production |
| CN107216209A (en) * | 2017-07-17 | 2017-09-29 | 河源市固体废物集中处置中心有限公司 | A kind of method that domestic sludge prepares Nutrition Soil |
| CN108094122A (en) * | 2017-12-29 | 2018-06-01 | 四川建筑职业技术学院 | A kind of formula of cultivated soil and the preparation method of the cultivated soil |
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