CN115072869A - Method for cultivating plants and reducing earthworm in-situ sludge by utilizing internal and external reflux enriched floating mud - Google Patents
Method for cultivating plants and reducing earthworm in-situ sludge by utilizing internal and external reflux enriched floating mud Download PDFInfo
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- CN115072869A CN115072869A CN202210666008.6A CN202210666008A CN115072869A CN 115072869 A CN115072869 A CN 115072869A CN 202210666008 A CN202210666008 A CN 202210666008A CN 115072869 A CN115072869 A CN 115072869A
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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
- C02F3/327—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae characterised by animals and plants
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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
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/305—Nitrification and denitrification treatment characterised by the denitrification
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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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- 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
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
Abstract
The invention belongs to the technical field of sewage treatment, discloses a method for in-situ enrichment and reduction of sludge in sewage treatment, and particularly relates to a method for in-situ sludge reduction of plants and earthworms by utilizing internal and external reflux enriched floating sludge. The method comprises the following steps: in the method, an internal and external return pipe in the A2O and AO processes is arranged above the water surface, and the in-situ enrichment of sludge on the surface layers of an anoxic tank and an anaerobic tank is realized by continuously impacting the water surface; the plants and the earthworms are cultured on the enriched sludge, rich root systems are formed, a good environment is provided for the growth and the propagation of the earthworms, the sludge on the surface layer of the anoxic pond provides rich food for the earthworms, and the sludge reduction effect is realized. The wormcast produced after the earthworms eat the sludge is nutrient substances which are easy to decompose and utilize bacteria and fungi, so the wormcast falling into the anoxic pond can play a role of a carbon source, and the denitrification effect of sewage treatment is enhanced. The method is labor-saving, energy-saving, safe, reliable, ecological, environment-friendly, free of secondary pollution, easy to maintain, small in modification of sewage treatment structures, and suitable for large-scale popularization.
Description
Technical Field
The invention belongs to the technical field of sewage sludge treatment, and particularly relates to a method for cultivating plants and reducing earthworm in-situ sludge by utilizing internal and external reflux enriched floating sludge.
Background
Excess sludge is excess activated sludge produced in the sewage treatment process. The excess sludge is usually treated by burning, landfill and other methods, which not only increases the operation cost of sewage treatment and consumes energy, but also can cause potential environmental pollution problems. The earthworm is utilized to treat the sludge, so that the discharge amount of the excess sludge of the system can be effectively reduced, and the earthworm sludge treatment system has the advantages of ecological environmental protection, low consumption, no secondary pollution and the like, and becomes a development trend of sludge treatment in the future.
The prior art CN201821871532.2 discloses a landscape type sludge ecological treatment device, which comprises a treatment container, wherein the top end of the treatment container is opened, the container is sequentially divided into a soil layer, a filter material layer and a water collecting layer from the top end to the bottom end, landscape plants are planted on the soil layer, and a filler with the function of a biological filter is filled in the filter material layer; earthworms are inoculated in both the soil layer and the filter material layer; the side wall of the container at the water collecting layer is provided with a water outlet hole.
Prior art CN201620117405.8 discloses an artificial earthworm wetland sewage treatment system, which comprises a wetland system and a ditch below the wetland system, and is characterized in that: the wetland system sets gradually plant, earthworm soil horizon, gravel layer, slag layer from top to bottom, the irrigation canals and ditches are located the wetland system below, and the sewage after the processing flows into the irrigation canals and ditches from the wetland system below.
The prior art belongs to the field of artificial wetland sewage treatment processes or excess sludge treatment by utilizing a biological filter, is different from the A2O or AO process of the invention in system structure and application scene, and is different from the invention in plant selection because the prior art needs supports such as filter materials and the like.
Disclosure of Invention
In order to solve one or more problems in the prior art, the invention provides an in-situ sludge reduction method, aiming at realizing sludge reduction by utilizing the predation effect of earthworms on sludge.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for enriching floating mud and culturing plants and reducing earthworm in-situ sludge by utilizing internal and external reflux, which comprises the following steps:
(1) sludge enrichment:
the method arranges the inner and outer return pipes in the A2O or AO process above the water surface, and realizes the in-situ enrichment of sludge on the surface layers of the anoxic tank and the anaerobic tank by continuously impacting the water surface;
as a preferred technical scheme of the invention, the internal and external return pipes are arranged 15-30cm above the water surface of the anoxic pond;
as a preferred technical scheme of the invention, the reflux ratio of the internal reflux is 150-300%;
as a preferred technical scheme of the invention, the reflux ratio of the external reflux is 50-100%;
as a preferred technical scheme of the invention, the thickness of the sludge enriched on the surface layers of the anoxic tank and the anaerobic tank is 10-30 cm.
The inner and outer return pipes are referred to as an inner return pipe and an outer return pipe.
As a preferred technical scheme of the invention, the area ratio of the anaerobic tank, the anoxic tank and the aerobic tank is generally 4: 6.
(2) Plant and earthworm cultivation:
plants, including but not limited to myriophyllum vulgare, alternanthera philoxeroides and the like are planted on the enriched sludge, the plants form rich root systems, and a good environment is provided for growth and propagation of earthworms.
In an A2O or AO system, due to the low dissolved oxygen environment of the anoxic tank and the anaerobic tank, many plants are difficult to grow normally and can generate root rot, and the aquatic plants such as the myriophyllum and the alternanthera philoxeroides can grow in the anoxic tank and the anaerobic tank better.
The role played by the plants in the present system includes:
(1.1) the plants can avoid the scouring action of rainwater on the surface sludge of the anoxic tank and the anaerobic tank, and are favorable for the protection of enriched floating mud;
(1.2) the earthworms are not like illumination, and dense plants can play a role in shading light;
(1.3) the root system of the plant provides a good growing environment for the earthworms, and the residual branches and fallen leaves provide a small amount of food for the earthworms;
(1.4) the plants provide a certain vertical space, which is beneficial for the earthworms to adjust the living space according to the humidity and the oxygen content of the sludge.
As a preferred technical scheme of the invention, the biomass is 5-15kg/m when the surface is covered by the plants 2 Earthworms are introduced.
As a preferred technical proposal of the invention, the initial adding amount of the earthworms is 0.3 to 1kg/m 2 The earthworms are preferably artificially domesticated earthworms such as Taiping No. 2 and Huaxing No. 1, and the earthworms can be bred in the system without being supplemented. The earthworms realize sludge reduction by predating sludge on the surface layers of the anoxic pond and the anaerobic pond.
Specifically, the better floating mud enrichment effect can be achieved after the internal and external reflux is carried out for 3 days according to the mode, at the moment, the plants can be planted, earthworms are added after the plants basically cover the surfaces of the anoxic tank and the anaerobic tank, and the initial adding density of the earthworms is about 0.5kg/m 2 The density of the earthworms can reach 0.5-1kg/m after the system is stable for 30-45 days 2 The daily sludge consumption of the earthworms is about 0.5-0.75kg/kg, and the sludge reduction rate of the system can reach about 10 percent.
The optimum growth temperature of the earthworms is 15-25 ℃, and the earthworms can survive even at the temperature higher than the optimum growth temperature in the actual operation process.
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects or advantages:
the method for enriching floating mud and culturing plants and reducing earthworm in-situ sludge by utilizing internal and external backflow realizes the enrichment of sludge on the surface layers of an anoxic pond and an anaerobic pond by utilizing the internal and external backflow pipelines of A2O and AO processes in sewage treatment, and then plants and culturing earthworms are planted above the surface layers of the anoxic pond and the anaerobic pond, thereby realizing the in-situ reduction of the sludge. In addition, the wormcast produced after the earthworms eat the sludge is nutrient substances which are easy to decompose and utilize bacteria and fungi, so that the wormcast falling into the anoxic pond can play a role of a carbon source, and the denitrification effect of sewage treatment is enhanced. The method is labor-saving, energy-saving, safe, reliable, ecological, environment-friendly, free of secondary pollution, easy to maintain, small in modification of sewage treatment structures, and suitable for large-scale popularization.
Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.
Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.
It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, steps or components, but does not preclude the presence or addition of one or more other features, steps or components.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for enriching floating mud by internal and external reflux for plant cultivation and earthworm in-situ sludge reduction according to an embodiment of the present invention.
FIG. 2 is a schematic view of an apparatus for enriching float sludge and cultivating plants and reducing sludge of earthworms in situ according to an embodiment of the present invention, wherein 1, an inner reflux pipe or an outer reflux pipe; 2. floating mud; 3. the water surface of the anoxic pond or the anaerobic pond; 4. a plant; 5. earthworms; 6. an anoxic tank or an anaerobic tank.
Fig. 3 is a photograph of an actual application of the method for enriching floating mud by internal and external reflux to culture plants and reduce earthworm in-situ sludge according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The plants and earthworm species of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Example 1
As shown in fig. 1 and 2, an embodiment of the present invention provides a method for enriching floating mud and reducing sludge in situ of earthworms by using internal and external reflux, the method comprising:
step S1: sludge enrichment:
and arranging the inner and outer return pipes in the A2O and AO processes above the water surface to realize the in-situ enrichment of sludge on the surface layers of the anoxic tank and the anaerobic tank, wherein the area ratio of the anaerobic tank to the anoxic tank to the aerobic tank is 4: 6.
In the specific implementation process, the internal and external reflux pipes in the A2O and AO processes are arranged at a position 30cm above the water surface, the reflux ratio of the internal reflux is 300%, the reflux ratio of the external reflux is 100%, and the in-situ enrichment of sludge on the surface layer of the anoxic tank is realized by continuously impacting the water surface. The sludge with the thickness of 10-30cm can be enriched on the surface layer of the anoxic pond after the inner return pipe is reconstructed for 3 days by using the method.
After completion of step S1, step S2 is executed: plant and earthworm cultivation:
step S2-1: growing plants on the enriched sludge
Planting the watermifoil on the sludge enriched in the anoxic pond and the anaerobic pond, wherein the initial adding amount is 3kg/m 2 And spraying with water for more than 2 times every day within 7 days after planting, and allowing the watermifoil to grow vertically and allow the root system to enter into floating mud and water surface for natural growth and propagation.
After completion of step S2-1, step S2-2 is performed: earthworm is introduced to degrade sludge;
the biomass of the watermifoil reaches 10kg/m 2 At the moment, the foxtail algae basically cover the surfaces of the anoxic tank and the anaerobic tank and form relatively stable root groups in the sludge, and the artificially domesticated earthworms such as Taiping No. 2, Huaxing No. 1 and the like are introduced, and the initial adding density of the earthworms is about 0.5kg/m 2 The density of the earthworms can reach 0.5-1kg/m after the system is stable for 30-45 days 2 The sludge consumption of the earthworms is about 0.5-0.75kg/kg per day, and a better sludge reduction effect can be realized.
After completion of step S2-2, step S2-3 is performed: the wormcast falls into the anoxic pond water body to assist denitrification for denitrification.
Example 2
As shown in fig. 1 and 2, an embodiment of the present invention provides a method for enriching floating mud and reducing sludge in situ of earthworms by using internal and external reflux, the method comprising:
step S1: sludge enrichment:
and arranging the inner and outer return pipes in the A2O and AO processes above the water surface to realize the in-situ enrichment of sludge on the surface layers of the anoxic tank and the anaerobic tank, wherein the area ratio of the anaerobic tank to the anoxic tank to the aerobic tank is 4: 6.
In the specific implementation process, the internal reflux pipes in the A2O and AO processes are arranged at the position 30cm above the water surface of the anoxic pond, the reflux ratio of the internal reflux is 300%, the reflux ratio of the external reflux is 100%, and the in-situ enrichment of sludge on the surface layer of the anoxic pond is realized by continuously impacting the water surface. The sludge with the thickness of 10-30cm can be enriched on the surface layer of the anoxic pond after the inner return pipe is reconstructed by the method for 3 days.
After completion of step S1, step S2 is executed: plant and earthworm cultivation:
step S2-1: growing plants on the enriched sludge
Planting water peanuts on the sludge enriched in the anoxic pond and the anaerobic pond, wherein the initial adding amount is 1kg/m 2 And the water is sprayed for more than 2 times every day within 7 days after the planting, the water peanuts can naturally grow and propagate when the water peanuts grow vertically and the root systems enter the floating mud and the water surface, and the water peanuts have the characteristic of internode rooting, so the water peanuts grow and propagate quickly.
After completion of step S2-1, step S2-2 is performed: earthworm is introduced to degrade sludge;
the biomass of the peanuts in the water reaches 6kg/m 2 When the water peanuts basically cover the surfaces of the anoxic pond and the anaerobic pond and form relatively stable root groups in the sludge, the artificially domesticated earthworms such as Taiping No. 2 and Huaxing No. 1 are introduced, and the initial adding density of the earthworms is about 0.5kg/m 2 The density of the earthworms can reach 0.5-1kg/m after 30-45 days when the earthworms grow and reproduce in the system (as shown in figure 3) 2 The sludge consumption of the earthworms is about 0.5-0.75kg/kg per day, and a better sludge reduction effect can be realized.
After completion of step S2-2, step S2-3 is performed: the wormcast falls into the anoxic pond water body to assist denitrification for denitrification.
The method for cultivating plants and earthworm in-situ sludge reduction by utilizing internal and external reflux enriched floating sludge provided by the embodiment of the invention is labor-saving, energy-saving, safe and reliable, ecological and environment-friendly, has no secondary pollution problem, is easy to maintain, has small change on sewage treatment structures, and is suitable for large-scale popularization.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The method for enriching the floating mud to culture the plants and reduce the in-situ sludge of the earthworms by utilizing the internal and external reflux is characterized by comprising the following steps:
(1) sludge enrichment:
the method arranges an internal and external return pipe of A2O or AO process in sewage treatment above the water surface, and realizes the in-situ enrichment of sludge on the surface layers of an anoxic tank and an anaerobic tank by continuously impacting the water surface by the internal and external return pipe;
(2) plant and earthworm cultivation:
plants are planted on the enriched floating mud to form rich root systems, so that a good environment is provided for the growth and the propagation of the earthworms, and the sludge on the surface layers of the anoxic tank and the anaerobic tank provides rich food for the earthworms, so that the sludge reduction effect is realized.
2. The method as claimed in claim 1, wherein the internal and external reflux pipes are located 15-30cm above the water surface during the sludge enrichment process.
3. The method for cultivating plants and earthworms by using internal and external reflux enriched floating sludge for in situ sludge reduction as claimed in claim 1, wherein the reflux ratio of the internal reflux is 150-300% during the floating sludge enrichment process.
4. The method for cultivating plants and earthworms by using internal and external reflux enriched floating sludge reduction according to claim 1, wherein the reflux ratio of the external reflux is 50-100% during the floating sludge enrichment process.
5. The method for enriching and cultivating plants and earthworms with sludge in situ reduction by using internal and external reflux as claimed in claim 1, wherein the area ratio of the anaerobic tank + anoxic tank to the aerobic tank in the A2O or AO process is generally 4: 6.
6. The method for in-situ sludge reduction of plants and earthworms by using internal and external reflux enriched floating sludge as claimed in claim 1, wherein the surface layers of the anoxic pond and the anaerobic pond after sludge enrichment are enriched with sludge with the thickness of 10-30 cm.
7. The method for enriching and cultivating plants and earthworms with internal and external reflux sludge for in situ sludge reduction according to claim 1, wherein during the cultivation of plants and earthworms, the plant species include but are not limited to watermifoil, alternanthera philoxeroides, etc.
8. The method for enriching floating mud and reducing sludge in situ for plant cultivation and earthworm according to claim 6, wherein the plant biomass is 5-15kg/m 2 。
9. The method for enriching and cultivating plants and earthworms with floating mud by internal and external reflux according to claim 1, wherein the initial feeding amount of earthworms is 0.3-1kg/m during the cultivation of plants and earthworms 2 。
10. The method for enriching and cultivating plants and decreasing sludge of earthworms in situ by using internal and external reflux according to claim 1 or 8, wherein the varieties of earthworms include but are not limited to Taiping No. 2, Huaxing No. 1, etc. during the cultivation of plants and earthworms.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101544447A (en) * | 2009-04-30 | 2009-09-30 | 郑鉴忠 | Technique for purifying organic sewage through bio-precipitation and purification method |
| KR20130000366A (en) * | 2012-11-21 | 2013-01-02 | 주식회사 하이드 | Artificial soil by vermicomposting method of treat sewage sludge using compound microorganism |
| CN108147624A (en) * | 2018-01-25 | 2018-06-12 | 南昌工程学院 | A kind of processing method of country sewage |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101544447A (en) * | 2009-04-30 | 2009-09-30 | 郑鉴忠 | Technique for purifying organic sewage through bio-precipitation and purification method |
| KR20130000366A (en) * | 2012-11-21 | 2013-01-02 | 주식회사 하이드 | Artificial soil by vermicomposting method of treat sewage sludge using compound microorganism |
| CN108147624A (en) * | 2018-01-25 | 2018-06-12 | 南昌工程学院 | A kind of processing method of country sewage |
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