CN110697996A - Treatment method for sewage discharged by circulating agriculture - Google Patents
Treatment method for sewage discharged by circulating agriculture Download PDFInfo
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- CN110697996A CN110697996A CN201911079360.4A CN201911079360A CN110697996A CN 110697996 A CN110697996 A CN 110697996A CN 201911079360 A CN201911079360 A CN 201911079360A CN 110697996 A CN110697996 A CN 110697996A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
- C05F7/00—Fertilisers from waste water, sewage sludge, sea slime, ooze or similar masses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
Abstract
The invention discloses a method for treating sewage discharged by circulating agriculture, in particular to the technical field of sewage treatment, which comprises the following specific treatment steps: s1, equipment installation: excavating a first pond, a second pond and a third pond which are adjacent to each other at three positions; s2, planting plants: planting brown algae, green algae, lotus flowers and duckweeds in the third pond; s3, first processing; s4, second processing; s5, processing for the third time; and S6, recycling the treated agricultural sewage. According to the invention, the agricultural wastes filtered from the sewage are collected and fermented, and then the fermented product is used as the fertilizer for brown algae, green algae, lotus flowers and duckweed, so that the agricultural wastes in the sewage are reused, the waste of resources is effectively prevented, and the agricultural planting cost is effectively reduced.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for treating sewage discharged by circular agriculture.
Background
The recycling agriculture is an agricultural production mode which realizes the production of less wastes and improves the resource utilization efficiency by applying a material recycling principle and a material multi-level utilization technology, is taken as an environment-friendly farming mode, has better social benefit, economic benefit and ecological benefit, can better promote the recycling of rural resources and the continuous development of modern agriculture only by continuously inputting technology, information and fund to enable the recycling agriculture to become a vigorous system engineering, and sewage generated in the recycling agriculture needs to be treated so as to be reused.
The sewage treatment is a process of purifying sewage to meet the water quality requirement of discharging the sewage into a certain water body or reusing the sewage, and a plurality of methods for treating the sewage are generally classified into a physical method, a chemical method, a biological method and the like.
Agricultural sewage contains a lot of impurity that is insoluble in aquatic, and the impurity includes agricultural wastes such as straw and rice husk, and these agricultural wastes can carry out reuse, and when handling agricultural sewage among the prior art, directly abandon agricultural wastes, cause the wasting of resources easily.
Disclosure of Invention
In order to overcome the defects in the prior art, the embodiment of the invention provides a method for treating sewage discharged by circulating agriculture, which is characterized in that agricultural wastes filtered from sewage are collected and fermented, and then the fermented product is used as fertilizers of brown algae, green algae, lotus flowers and duckweeds, so that the agricultural wastes in the sewage are reused, the waste of resources is effectively prevented, and the agricultural planting cost is effectively reduced.
In order to achieve the purpose, the invention provides the following technical scheme: a treatment method of sewage discharged by circular agriculture comprises the following specific treatment steps:
s1, equipment installation: excavating a first pond, a second pond and a third pond which are adjacent at three positions, wherein two layers of metal filter screens are fixed in the first pond, the aperture of the first layer of metal filter screen is larger, and the aperture of the second layer of metal filter screen is smaller;
s2, planting plants: planting brown algae, green algae, lotus flowers and duckweeds in the third pond;
s3, first processing:
s3.1, conveying the agricultural sewage into the first pond by using a pump, wherein impurities with larger volume in the sewage, such as leaves and plastic bags, stay on the first layer of metal filter screen, agricultural wastes, such as straws and rice husks, stay on the second layer of metal filter screen, and the filtered sewage falls into the bottom end in the first pond;
s3.2, throw into the rubbish recycle bin after collecting the great impurity of volume on the first layer metal filter screen, unpack apart the agricultural waste collection on the second floor metal filter screen behind the first layer metal filter screen and ferment, the fermentation step specifically is:
a. drying the collected agricultural wastes in the air to remove most of moisture, putting the agricultural wastes into a dryer for drying, and crushing the dried agricultural wastes by using a crusher;
b. stirring and mixing the straw leavening agent and a proper amount of water to prepare active fermentation liquor;
c. adding the crushed materials and water into a stirrer, and uniformly mixing to obtain mixed materials;
d. spraying the active fermentation liquor on the mixed material by using a sprayer, and stirring while spraying to uniformly mix the active fermentation liquor and the mixed material;
e. after spraying, putting the materials into a fermentation bin for fermentation;
s4, second processing: conveying the filtered sewage into a second pond by using a pump, adding an aqueous solution prepared by mixing an inorganic flocculant, an organic anionic flocculant and water into the second pond, wherein suspended particles in the sewage lose stability, colloidal particles are mutually agglomerated to increase the particles to form floccules and alumen ustum, and the floccules are separated from a water phase under the action of gravity to precipitate after growing to a certain volume, so that a large amount of suspended matters in the sewage are removed;
s5, third processing: the supernatant in the second pond is conveyed into a third pond by a pump, and the brown algae, the green algae, the lotus flowers and the duckweeds planted in the third pond have the effects of absorbing, precipitating and enriching heavy metals in the sewage, so that the heavy metals in the sewage are effectively removed;
s6, recycling the treated agricultural sewage: the agricultural sewage treated in the third pond can be extracted for irrigating the rice field.
In a preferred embodiment, the agricultural waste is dried for 12-24h in step S3.2 a.
In a preferred embodiment, the drying temperature of the dryer in step S3.2 a is 150 ℃ and 200 ℃, and the drying time is 10-20 min.
In a preferred embodiment, the ratio of the crushed material to the water in the step S3.2 c is 1:1.5, the water content of the mixed material is controlled to be 60-70%, and the judgment standard is as follows: the material is gripped by hand, and the finger can be put in water without dripping, and the material is scattered when the hand is loosened.
In a preferred embodiment, the fermentation temperature in step S3.2 e is 24-38 ℃ and the fermentation time is 20-30 days.
In a preferred embodiment, the product fermented in step S3.2 is used for fertilizing brown algae, green algae, lotus flowers and duckweed in the third pond.
In a preferred embodiment, in step S4, the inorganic flocculant is aluminum sulfate and the organic anionic flocculant is polyacrylamide.
The invention has the technical effects and advantages that:
1. according to the invention, agricultural sewage is firstly treated for the first time to remove water-insoluble impurities in the sewage, suspended particles in the sewage are destabilized by flocculation through the second treatment, floccules are gradually formed, a large amount of suspended matters in the sewage are removed through precipitation, and then heavy metals in the sewage are taken out through the third treatment by utilizing the strong absorption and enrichment effects of algae plants on the heavy metals;
2. according to the invention, the agricultural wastes filtered from the sewage are collected and fermented, and then the fermented product is used as the fertilizer for the brown algae, the green algae, the lotus flowers and the duckweed, so that the agricultural wastes in the sewage are reused, the waste of resources is effectively prevented, and the cost for planting the brown algae, the green algae, the lotus flowers and the duckweed is effectively reduced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides a method for treating sewage discharged by circular agriculture, which comprises the following specific treatment steps:
s1, equipment installation: excavating a first pond, a second pond and a third pond which are adjacent at three positions, wherein two layers of metal filter screens are fixed in the first pond, the aperture of the first layer of metal filter screen is larger, and the aperture of the second layer of metal filter screen is smaller;
s2, planting plants: planting brown algae, green algae, lotus flowers and duckweeds in the third pond;
s3, first processing:
s3.1, conveying the agricultural sewage into the first pond by using a pump, wherein impurities with larger volume in the sewage, such as leaves and plastic bags, stay on the first layer of metal filter screen, agricultural wastes, such as straws and rice husks, stay on the second layer of metal filter screen, and the filtered sewage falls into the bottom end in the first pond;
s3.2, throwing into the rubbish recycle bin after collecting the great impurity of volume on the first layer metal filter screen, unpack apart the agricultural waste collection on the second floor metal filter screen and ferment after the first layer metal filter screen, the product after the fermentation is used for fertilizing brown algae, green alga, lotus flower and duckweed in the third pond, the fermentation step specifically is:
a. airing the collected agricultural wastes for 12 hours, removing most of water, putting the agricultural wastes into a dryer for drying at the drying temperature of 150 ℃ for 10min, and crushing the dried agricultural wastes by using a crusher;
b. stirring and mixing the straw leavening agent and a proper amount of water to prepare active fermentation liquor;
c. adding the crushed materials and water into a stirrer, and uniformly mixing to obtain a mixed material, wherein the ratio of the crushed materials to the water is 1:1.5, the water content of the mixed material is controlled at 60%, and the judgment standard is as follows: tightly grasping a handle of material by hands, and ensuring that the fingers do not drip when being sewed with water, and the material is scattered when the hands are loosened;
d. spraying the active fermentation liquor on the mixed material by using a sprayer, and stirring while spraying to uniformly mix the active fermentation liquor and the mixed material;
e. after spraying, putting the materials into a fermentation bin for fermentation, wherein the fermentation temperature is 24 ℃, and the fermentation time is 20 days;
s4, second processing: conveying the filtered sewage into a second pond by using a pump, adding an aqueous solution prepared by mixing an inorganic flocculant, an organic anionic flocculant and water into the second pond, wherein the inorganic flocculant is aluminum sulfate, and the organic anionic flocculant is polyacrylamide, so that the stability of suspended particles in the sewage is lost, colloidal particles are mutually condensed to enlarge the particles, a flocculating body and alum floc are formed, and the flocculating body grows to a certain volume and then is separated from a water phase under the action of gravity to precipitate, so that a large amount of suspended matters in the sewage are removed;
s5, third processing: the supernatant in the second pond is conveyed into a third pond by a pump, and the brown algae, the green algae, the lotus flowers and the duckweeds planted in the third pond have the effects of absorbing, precipitating and enriching heavy metals in the sewage, so that the heavy metals in the sewage are effectively removed;
s6, recycling the treated agricultural sewage: the agricultural sewage treated in the third pond can be extracted for irrigating the rice field.
Example 2:
the invention provides a method for treating sewage discharged by circular agriculture, which comprises the following specific treatment steps:
s1, equipment installation: excavating a first pond, a second pond and a third pond which are adjacent at three positions, wherein two layers of metal filter screens are fixed in the first pond, the aperture of the first layer of metal filter screen is larger, and the aperture of the second layer of metal filter screen is smaller;
s2, planting plants: planting brown algae, green algae, lotus flowers and duckweeds in the third pond;
s3, first processing:
s3.1, conveying the agricultural sewage into the first pond by using a pump, wherein impurities with larger volume in the sewage, such as leaves and plastic bags, stay on the first layer of metal filter screen, agricultural wastes, such as straws and rice husks, stay on the second layer of metal filter screen, and the filtered sewage falls into the bottom end in the first pond;
s3.2, throwing into the rubbish recycle bin after collecting the great impurity of volume on the first layer metal filter screen, unpack apart the agricultural waste collection on the second floor metal filter screen and ferment after the first layer metal filter screen, the product after the fermentation is used for fertilizing brown algae, green alga, lotus flower and duckweed in the third pond, the fermentation step specifically is:
a. airing the collected agricultural wastes for 18 hours, removing most of water, putting the agricultural wastes into a dryer for drying at 175 ℃ for 15min, and crushing the dried agricultural wastes by using a crusher;
b. stirring and mixing the straw leavening agent and a proper amount of water to prepare active fermentation liquor;
c. adding the crushed materials and water into a stirrer, and uniformly mixing to obtain a mixed material, wherein the proportion of the crushed materials to the water is 1:1.5, the water content of the mixed material is controlled at 65%, and the judgment standard is as follows: tightly grasping a handle of material by hands, and ensuring that the fingers do not drip when being sewed with water, and the material is scattered when the hands are loosened;
d. spraying the active fermentation liquor on the mixed material by using a sprayer, and stirring while spraying to uniformly mix the active fermentation liquor and the mixed material;
e. after spraying, putting the materials into a fermentation bin for fermentation, wherein the fermentation temperature is 32 ℃, and the fermentation time is 25 days;
s4, second processing: conveying the filtered sewage into a second pond by using a pump, adding an aqueous solution prepared by mixing an inorganic flocculant, an organic anionic flocculant and water into the second pond, wherein the inorganic flocculant is aluminum sulfate, and the organic anionic flocculant is polyacrylamide, so that the stability of suspended particles in the sewage is lost, colloidal particles are mutually condensed to enlarge the particles, a flocculating body and alum floc are formed, and the flocculating body grows to a certain volume and then is separated from a water phase under the action of gravity to precipitate, so that a large amount of suspended matters in the sewage are removed;
s5, third processing: the supernatant in the second pond is conveyed into a third pond by a pump, and the brown algae, the green algae, the lotus flowers and the duckweeds planted in the third pond have the effects of absorbing, precipitating and enriching heavy metals in the sewage, so that the heavy metals in the sewage are effectively removed;
s6, recycling the treated agricultural sewage: the agricultural sewage treated in the third pond can be extracted for irrigating the rice field.
Example 3:
the invention provides a method for treating sewage discharged by circular agriculture, which comprises the following specific treatment steps:
s1, equipment installation: excavating a first pond, a second pond and a third pond which are adjacent at three positions, wherein two layers of metal filter screens are fixed in the first pond, the aperture of the first layer of metal filter screen is larger, and the aperture of the second layer of metal filter screen is smaller;
s2, planting plants: planting brown algae, green algae, lotus flowers and duckweeds in the third pond;
s3, first processing:
s3.1, conveying the agricultural sewage into the first pond by using a pump, wherein impurities with larger volume in the sewage, such as leaves and plastic bags, stay on the first layer of metal filter screen, agricultural wastes, such as straws and rice husks, stay on the second layer of metal filter screen, and the filtered sewage falls into the bottom end in the first pond;
s3.2, throwing into the rubbish recycle bin after collecting the great impurity of volume on the first layer metal filter screen, unpack apart the agricultural waste collection on the second floor metal filter screen and ferment after the first layer metal filter screen, the product after the fermentation is used for fertilizing brown algae, green alga, lotus flower and duckweed in the third pond, the fermentation step specifically is:
a. airing the collected agricultural wastes for 24 hours, removing most of water, putting the agricultural wastes into a dryer for drying at the drying temperature of 200 ℃ for 20min, and crushing the dried agricultural wastes by using a crusher;
b. stirring and mixing the straw leavening agent and a proper amount of water to prepare active fermentation liquor;
c. adding the crushed materials and water into a stirrer, and uniformly mixing to obtain a mixed material, wherein the ratio of the crushed materials to the water is 1:1.5, the water content of the mixed material is controlled at 70%, and the judgment standard is as follows: tightly grasping a handle of material by hands, and ensuring that the fingers do not drip when being sewed with water, and the material is scattered when the hands are loosened;
d. spraying the active fermentation liquor on the mixed material by using a sprayer, and stirring while spraying to uniformly mix the active fermentation liquor and the mixed material;
e. after spraying, putting the materials into a fermentation bin for fermentation, wherein the fermentation temperature is 38 ℃, and the fermentation time is 30 days;
s4, second processing: conveying the filtered sewage into a second pond by using a pump, adding an aqueous solution prepared by mixing an inorganic flocculant, an organic anionic flocculant and water into the second pond, wherein the inorganic flocculant is aluminum sulfate, and the organic anionic flocculant is polyacrylamide, so that the stability of suspended particles in the sewage is lost, colloidal particles are mutually condensed to enlarge the particles, a flocculating body and alum floc are formed, and the flocculating body grows to a certain volume and then is separated from a water phase under the action of gravity to precipitate, so that a large amount of suspended matters in the sewage are removed;
s5, third processing: the supernatant in the second pond is conveyed into a third pond by a pump, and the brown algae, the green algae, the lotus flowers and the duckweeds planted in the third pond have the effects of absorbing, precipitating and enriching heavy metals in the sewage, so that the heavy metals in the sewage are effectively removed;
s6, recycling the treated agricultural sewage: the agricultural sewage treated in the third pond can be extracted for irrigating the rice field.
Example 4:
the sewage treatment methods of the above examples 1 to 3 were respectively applied to 90 agricultural sewage having the same volume, each 30 of which was treated as one group, and the treatment methods of the three examples were respectively applied in three groups, and after treatment, the following data were obtained:
| amount of agricultural wastewater having the same volume | Processing efficiency improvement averaging | Average degree of reduction of heavy metal content | Average degree of reduction of agricultural planting cost | |
| Example 1 | 30 | 36％ | 50％ | 10％ |
| Example 2 | 30 | 60％ | 78％ | 25％ |
| Example 3 | 30 | 40％ | 62％ | 28％ |
As can be seen from the above table, the treatment method in example 2 is moderate, the fermentation conditions of the agricultural waste are appropriate, the fermentation efficiency is high, the overall treatment efficiency is high, and the fermentation product is used as a fertilizer for brown algae, green algae, lotus flowers and duckweed, which not only helps the brown algae, green algae, lotus flowers and duckweed to grow, but also effectively improves the enrichment effect of the heavy metals in the sewage, thereby effectively improving the sewage treatment effect and effectively reducing the agricultural planting cost.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (7)
1. A method for treating sewage discharged by circulating agriculture is characterized in that: the specific treatment steps are as follows:
s1, equipment installation: excavating a first pond, a second pond and a third pond which are adjacent at three positions, wherein two layers of metal filter screens are fixed in the first pond, the aperture of the first layer of metal filter screen is larger, and the aperture of the second layer of metal filter screen is smaller;
s2, planting plants: planting brown algae, green algae, lotus flowers and duckweeds in the third pond;
s3, first processing:
s3.1, conveying the agricultural sewage into the first pond by using a pump, wherein impurities with larger volume in the sewage, such as leaves and plastic bags, stay on the first layer of metal filter screen, agricultural wastes, such as straws and rice husks, stay on the second layer of metal filter screen, and the filtered sewage falls into the bottom end in the first pond;
s3.2, throw into the rubbish recycle bin after collecting the great impurity of volume on the first layer metal filter screen, unpack apart the agricultural waste collection on the second floor metal filter screen behind the first layer metal filter screen and ferment, the fermentation step specifically is:
drying the collected agricultural wastes in the air to remove most of moisture, putting the agricultural wastes into a dryer for drying, and crushing the dried agricultural wastes by using a crusher;
stirring and mixing the straw leavening agent and a proper amount of water to prepare active fermentation liquor;
adding the crushed materials and water into a stirrer, and uniformly mixing to obtain mixed materials;
spraying the active fermentation liquor on the mixed material by using a sprayer, and stirring while spraying to uniformly mix the active fermentation liquor and the mixed material;
after spraying, putting the materials into a fermentation bin for fermentation;
s4, second processing: conveying the filtered sewage into a second pond by using a pump, adding an aqueous solution prepared by mixing an inorganic flocculant, an organic anionic flocculant and water into the second pond, wherein suspended particles in the sewage lose stability, colloidal particles are mutually agglomerated to increase the particles to form floccules and alumen ustum, and the floccules are separated from a water phase under the action of gravity to precipitate after growing to a certain volume, so that a large amount of suspended matters in the sewage are removed;
s5, third processing: the supernatant in the second pond is conveyed into a third pond by a pump, and the brown algae, the green algae, the lotus flowers and the duckweeds planted in the third pond have the effects of absorbing, precipitating and enriching heavy metals in the sewage, so that the heavy metals in the sewage are effectively removed;
s6, recycling the treated agricultural sewage: the agricultural sewage treated in the third pond can be extracted for irrigating the rice field.
2. The method of claim 1 for treating sewage discharged from recycling agriculture, wherein the method comprises the following steps: and (c) airing the agricultural wastes for 12-24h in the step (a) of the step (S3.2).
3. The method of claim 1 for treating sewage discharged from recycling agriculture, wherein the method comprises the following steps: in step S3.2, the drying temperature of the dryer is 150-.
4. The method of claim 1 for treating sewage discharged from recycling agriculture, wherein the method comprises the following steps: in the step (c) of the step (S3.2), the ratio of the crushed material to the water is 1:1.5, the water content of the mixed material is controlled to be 60-70%, and the judgment standard is as follows: the material is gripped by hand, and the finger can be put in water without dripping, and the material is scattered when the hand is loosened.
5. The method of claim 1 for treating sewage discharged from recycling agriculture, wherein the method comprises the following steps: the fermentation temperature in step S3.2 is 24-38 deg.C, and the fermentation time is 20-30 days.
6. The method of claim 1 for treating sewage discharged from recycling agriculture, wherein the method comprises the following steps: the product fermented in step S3.2 is used for fertilizing brown algae, green algae, lotus flowers and duckweed in the third pond.
7. The method of claim 1 for treating sewage discharged from recycling agriculture, wherein the method comprises the following steps: in step S4, aluminum sulfate is used as the inorganic flocculant, and polyacrylamide is used as the organic anionic flocculant.
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