CN216027034U - System for sludge, kitchen waste and reed carry out closed loop treatment - Google Patents
System for sludge, kitchen waste and reed carry out closed loop treatment Download PDFInfo
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- CN216027034U CN216027034U CN202121817193.1U CN202121817193U CN216027034U CN 216027034 U CN216027034 U CN 216027034U CN 202121817193 U CN202121817193 U CN 202121817193U CN 216027034 U CN216027034 U CN 216027034U
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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
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- 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
Abstract
The utility model discloses a system for carrying out closed-loop treatment on sludge, kitchen waste and reeds. The device comprises a pretreatment system and a digestion tank, wherein the pretreatment system is connected with the digestion tank; the pretreatment system comprises a municipal sludge pretreatment device, a kitchen waste pretreatment device and a reed pretreatment device; the digestion tank comprises a primary digestion tank and a secondary digestion tank; the municipal sludge pretreatment device, the kitchen waste pretreatment device and the reed pretreatment device are respectively connected with the primary digestion tank; the first-stage digestion tank is connected with the second-stage digestion tank; the heating treatment structure and the alkali liquor treatment structure are respectively connected with the municipal sludge pretreatment device; the kitchen waste pretreatment device comprises a separation structure, a crushing structure and an acidification tank; the separation structure, the crushing structure and the acidification tank are connected in sequence; the reed pretreatment device comprises a filter pressing structure and a crushing structure; the filter-pressing structure is connected with the crushing structure. The utility model has the advantages of realizing the comprehensive utilization of sludge resources, and carrying out harmless and reduction treatment on the sludge.
Description
Technical Field
The utility model relates to the technical field of water environment treatment, in particular to a system for performing closed-loop treatment on sludge, kitchen waste and reeds, which is suitable for treating municipal sludge, kitchen waste and reeds.
Background
With the development of economy, the yield of municipal organic wastes such as kitchen waste, municipal excess sludge and the like is increasing day by day. The traditional sludge treatment process has more modes, the investment and operation cost of sludge incineration is high, the pollution problems of dioxin and the like are difficult to completely solve, and the utilization of incineration residues is uncertain; the direct composting of the sludge needs more land, the time is long, and the heavy metal in the sludge is easy to pollute the soil and plants; the solar sludge drying occupies a large area; the sludge landfill operation is simple, but the water content is high, the viscosity is large, the rolling equipment is easy to slip, and the landfill difficulty is increased.
Therefore, it is necessary to develop a novel sludge treatment process for performing a harmless and reducing treatment of sludge and realizing a comprehensive utilization of sludge resources.
Disclosure of Invention
The utility model aims to provide a system for carrying out closed-loop treatment on sludge, kitchen waste and reeds, so that comprehensive utilization of sludge resources is realized, and effective harmless and quantitative reduction treatment is carried out on the sludge.
In order to achieve the purpose, the technical scheme of the utility model is as follows: a system for carrying out closed-loop treatment on sludge, kitchen waste and reeds is characterized in that: the device comprises a pretreatment system and a digestion tank, wherein the pretreatment system is connected with the digestion tank; the pretreatment system comprises a municipal sludge pretreatment device, a kitchen waste pretreatment device and a reed pretreatment device;
the digestion tank comprises a primary digestion tank and a secondary digestion tank;
the municipal sludge pretreatment device, the kitchen waste pretreatment device and the reed pretreatment device are respectively connected with the primary digestion tank; the first-stage digestion tank is connected with the second-stage digestion tank;
the heating treatment structure and the alkali liquor treatment structure are respectively connected with the municipal sludge pretreatment device;
the kitchen waste pretreatment device comprises a separation structure, a crushing structure and an acidification tank; the separation structure, the crushing structure and the acidification tank are connected in sequence;
the reed pretreatment device comprises a filter pressing structure and a crushing structure; the filter-pressing structure is connected with the crushing structure.
In the technical scheme, a digestion tank heating structure and a digestion tank stirring structure are arranged in the primary digestion tank; the upper part of the primary digestion tank is covered with a gas-collecting hood.
In the technical scheme, measuring devices are arranged in the primary digestion tank and the secondary digestion tank;
the measuring devices include, but are not limited to, PH measuring devices, temperature measuring devices, and time timers.
The utility model has the following advantages:
(1) the utility model realizes the comprehensive utilization of sludge resources, and effectively reduces, stabilizes and harmlessly treats the sludge;
(2) 30-50% of organic matters can be removed by the combined anaerobic fermentation, the biogas yield of the combined anaerobic fermentation is improved, and better economic benefit is generated; the defects that in the prior art, the sludge carbon source is less, the food waste carbon source is more, and the effect of performing anaerobic fermentation independently is not good are overcome;
(3) the reed has low water content, is rich in nitrogen and phosphorus and is also a carbon source, kitchen waste and sludge are added to participate in combined anaerobic fermentation, on one hand, the reed can be consumed to generate circulation, on the other hand, the reed can adjust the amount of the kitchen waste (the C/N of the kitchen waste is 15-20, the C/N of the reed is 12.25-40.81, and when the using amount of the kitchen waste is unstable, the reed is adopted to adjust the carbon-nitrogen ratio in the combined anaerobic fermentation and adjust the product of the combined anaerobic fermentation);
(4) the biogas residue generated by the sludge and the anaerobic combination can be used for composting and can be used as a waste material for reed growth, and economic benefits (such as reed activated carbon production, hydrogen energy production and the like) can be generated by planting the reeds with high density;
(5) the sludge in the utility model can be used as fuel or power generation by combining the sludge and the biogas generated by anaerobic fermentation, thereby improving the economic benefit of sludge treatment.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
In the figure, 1-pretreatment system, 1.1-municipal sludge pretreatment device, 1.2-kitchen waste pretreatment device, 1.21-separation structure, 1.22-crushing structure, 1.23-acidification tank, 1.3-reed pretreatment device, 1.31-filter pressing structure, 1.32-crushing structure, 2-digestion tank, 2.1-primary digestion tank, 2.2-secondary digestion tank, 3-heating treatment structure, 4-alkali liquor treatment structure, 5-digestion tank heating structure, 6-digestion tank stirring structure and 7-measuring device.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are not intended to limit the present invention, but are merely exemplary. While the advantages of the utility model will be clear and readily understood by the description.
Referring to FIG. 2: a system for carrying out closed-loop treatment on sludge, kitchen waste and reeds comprises a pretreatment system 1 and a digestion tank 2, wherein the pretreatment system 1 is connected with the digestion tank 2; the pretreatment system 1 comprises a municipal sludge pretreatment device 1.1, a kitchen waste pretreatment device 1.2 and a reed pretreatment device 1.3;
the digestion tank 2 comprises a primary digestion tank 2.1 and a secondary digestion tank 2.2; the digestion tank 2 is a combined anaerobic fermentation system of the utility model; conveying the pretreated municipal sludge, kitchen waste and reed slag to a digestion tank for combined anaerobic fermentation; the biogas generated after municipal sludge, kitchen waste and reed residue are jointly anaerobic can be used as fuel, the residual biogas residue is used as a growth fertilizer for plants (such as reeds) around a solid waste storage yard, and the harvested reeds can be subjected to filter pressing and crushing to form reed residue which is used as a raw material for treating the municipal sludge and the kitchen waste;
the municipal sludge pretreatment device 1.1, the kitchen waste pretreatment device 1.2 and the reed pretreatment device 1.3 are respectively connected with the primary digestion tank 2.1; the primary digestion tank 2.1 is connected with the secondary digestion tank 2.2;
the heating treatment structure 3 and the alkali liquor treatment structure 4 are respectively connected with the municipal sludge pretreatment device 1.1; municipal sludge pretreatment, namely, a heat treatment method and an alkali treatment method are combined and applied to destroy particle components in the sludge, so that organic matters required by anaerobic bacteria are released, the anaerobic digestion process is accelerated, and the gas production rate is increased;
the kitchen waste pretreatment device 1.2 comprises a separation structure 1.21, a crushing structure 1.22 and an acidification tank 1.23; the separation structure 1.21, the crushing structure 1.22 and the acidification tank 1.23 are connected in sequence; the kitchen waste pretreatment device 1.2 is used for pretreating kitchen waste, the kitchen waste is rich in a large amount of oil and poor in oil degradation, oil removal treatment is firstly carried out on the kitchen waste by adopting a separation technology of a biological membrane in a separation structure 1.21, then the kitchen waste is crushed and ground, and then the kitchen waste is conveyed to an acidification tank for acidification treatment, so that organic matters in the kitchen waste are released;
the reed pretreatment device 1.3 comprises a filter pressing structure 1.31 and a crushing structure 1.32; the filter pressing structure 1.31 is connected with the crushing structure 1.32, and the reed pretreatment device 1.3 pretreats the reeds, firstly carries out filter pressing and then crushes the reeds to form reed slag.
Further, a digestion tank heating structure 5 and a digestion tank stirring structure 6 are arranged in the primary digestion tank 2.1; the digestion tank is divided into two stages (a first-stage digestion tank 2.1 and a second-stage digestion tank 2.2), heating and stirring measures are arranged in the first-stage digestion tank, a gas collecting hood covers the upper part of the first-stage digestion tank 2.1, and methane is collected; the secondary nitrification tank is not provided with heating and stirring measures, sludge is continuously digested by depending on the waste heat of the sludge from the primary digestion tank, the digestion temperature is 35-55 ℃, the gas production amount accounts for about 20 percent of the total gas production amount, and the sludge can be collected or not collected.
Furthermore, measuring devices 7 are arranged in the first-stage digestion tank 2.1 and the second-stage digestion tank 2.2;
the measuring device 7 includes, but is not limited to, a PH measuring device, a temperature measuring device, and a time timer.
Furthermore, facultative bacteria and anaerobic bacteria are arranged in the digestion tank.
As shown in FIG. 1, the treatment steps of the system for performing closed-loop treatment on sludge, kitchen waste and reeds provided by the utility model are as follows:
the method comprises the following steps: pre-treating;
municipal sludge pretreatment, namely, a heat treatment method and an alkali treatment method are combined and applied to destroy particle components in the sludge, so that organic matters required by anaerobic bacteria are released, the anaerobic digestion process is accelerated, and the gas production rate is increased;
the kitchen waste is pretreated, the kitchen waste is rich in a large amount of oil and poor in oil degradability, oil removal treatment is carried out on the kitchen waste by adopting a biomembrane separation technology, then the kitchen waste is crushed and ground, and then the kitchen waste is conveyed to an acidification tank;
reed pretreatment, namely performing filter pressing at first, and then crushing the reed to form reed slag;
step two: performing combined anaerobic fermentation;
the pretreated municipal sludge, kitchen waste and reed slag are conveyed to a digestion tank 2 for combined anaerobic fermentation, the digestion tank 2 is divided into two stages, heating and stirring measures are arranged in a primary digestion tank 2.1, and a gas collecting hood is covered on the upper part of the digestion tank to collect biogas; the secondary nitrification tank 2.2 is not provided with heating and stirring measures, sludge is continuously digested by depending on the waste heat of the sludge from the primary digestion tank, the digestion temperature is 35-55 ℃, the gas production amount accounts for about 20 percent of the total gas production amount, and the sludge can be collected or not collected, and the secondary digestion tank has a concentration function because of no stirring;
the biogas generated after the municipal sludge, the kitchen waste and the reed slag are subjected to combined anaerobic fermentation can be used as fuel, the residual biogas slag is used as a growth fertilizer for plants (such as reeds) around a solid waste storage yard, and the harvested reeds can be subjected to filter pressing and crushing to form reed slag which is used as a raw material for treating the municipal sludge and the kitchen waste.
In the second step, during combined anaerobic fermentation, the municipal sludge, the kitchen waste and the reed slag are in a weight ratio of 5:5: 1-5: 3:3, so that the C/N of the combined anaerobic digestion is 10-20, and the combined anaerobic fermentation effect is improved.
In the second step, during the combined anaerobic fermentation, the hydraulic retention time of the combined anaerobic reaction of the municipal sludge, the kitchen waste and the reed slag is 10-20 d, and the produced biogas amount is large.
In the second step, during the combined anaerobic fermentation, the temperature of the combined anaerobic reaction of the municipal sludge, the kitchen waste and the reed slag is 35-55 ℃, and the combined anaerobic fermentation is promoted.
The digestion tank contains facultative bacteria and anaerobic bacteria, and 30-50% of organic matters can be removed.
In the second step, when combined anaerobic fermentation is carried out, three-stage reactions occur in the digestion tank, namely a hydrolysis acidification stage, a hydrogen-producing and acetic-acid-producing stage and a methane-producing stage;
the facultative bacteria and anaerobic bacteria in the digestion tank comprise acidifying agent for producing hydrogen and acetic acid and methanogen.
The pH value of the hydrolysis acidification stage and the hydrogen-producing and acetic acid-producing stage of the digestion tank is controlled to be 5.0-6.5, so that the effect of the hydrolysis and acidification microbial inoculum of the utility model on producing hydrogen and acetic acid is improved;
the PH value of the methanogenesis stage is controlled to be 6.8-7.5, the activity of methanogens is improved, and the methanogenesis effect of the utility model is improved.
The determination of the PH value range can ensure that the hydrolysis acidification, hydrogen production and acetic acid production and methane production stages of the utility model react more thoroughly, generate more biogas amount and ensure that the combined anaerobic digestion reaction is more thorough.
Under the present situation, reeds grow all over the country, and the yield is high; the reed has moderate C/N ratio and low water content, and is suitable for being used as a material for anaerobic fermentation; the growth cycle of the reeds is short, the yield is high, the application value is high, the biogas residues are used for planting the reeds and can provide the yield for the growth of the reeds, one part of the grown reeds can be used for resource utilization (fiberboards and biological activated carbon) according to the requirements, and the other part of the grown reeds enters the circulation of combined anaerobic fermentation; the organic matter content of reed cellulose, hemicellulose and the like is high, so that the biomass energy-utilizing biomass energy-utilizing. Therefore, the utility model adopts the reed and the sludge kitchen waste to carry out combined anaerobic treatment, can remove 30 to 50 percent of organic matters, and generates better economic benefit after the combined anaerobic treatment.
The sludge, the kitchen waste and the reeds are subjected to combined anaerobic digestion, the carbon-nitrogen ratio in the combined anaerobic fermentation is adjusted through the reeds, so that the product of the combined anaerobic fermentation is adjusted, the digestion reaction is more thorough, the methane yield is improved, the yield of biogas residues is reduced, the generated biogas residues are used as compost of the reeds to promote the growth of the reeds, the reeds are applied to the combined anaerobic digestion in the utility model, and the circulation is carried out, so that the sludge, the kitchen waste and the reeds are subjected to closed-loop treatment, the sludge and the kitchen waste resources are comprehensively utilized, and the sludge and the kitchen waste are effectively subjected to quantitative reduction, stabilization and harmless treatment.
Other parts not described belong to the prior art.
Claims (3)
1. A system for carrying out closed-loop treatment on sludge, kitchen waste and reeds is characterized in that: comprises a pretreatment system (1) and a digestion tank (2), wherein the pretreatment system (1) is connected with the digestion tank (2); the pretreatment system (1) comprises a municipal sludge pretreatment device (1.1), a kitchen waste pretreatment device (1.2) and a reed pretreatment device (1.3);
the digestion tank (2) comprises a primary digestion tank (2.1) and a secondary digestion tank (2.2);
the municipal sludge pretreatment device (1.1), the kitchen waste pretreatment device (1.2) and the reed pretreatment device (1.3) are respectively connected with the primary digestion tank (2.1); the primary digestion tank (2.1) is connected with the secondary digestion tank (2.2);
the heating treatment structure (3) and the alkali liquor treatment structure (4) are respectively connected with the municipal sludge pretreatment device (1.1);
the kitchen waste pretreatment device (1.2) comprises a separation structure (1.21), a crushing structure (1.22) and an acidification tank (1.23); the separation structure (1.21), the crushing structure (1.22) and the acidification tank (1.23) are connected in sequence;
the reed pretreatment device (1.3) comprises a filter pressing structure (1.31) and a crushing structure (1.32); the filter pressing structure (1.31) is connected with the crushing structure (1.32).
2. The system for closed-loop treatment of sludge, kitchen waste and reeds according to claim 1, characterized in that: a digestion tank heating structure (5) and a digestion tank stirring structure (6) are arranged in the primary digestion tank (2.1); the upper part of the primary digestion tank (2.1) is covered with a gas-collecting hood.
3. The system for closed-loop treatment of sludge, kitchen waste and reeds according to claim 2, characterized in that: measuring devices (7) are arranged in the first-stage digestion tank (2.1) and the second-stage digestion tank (2.2);
the measuring devices (7) include, but are not limited to, PH measuring devices, temperature measuring devices and time timers.
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| CN202121817193.1U CN216027034U (en) | 2021-08-05 | 2021-08-05 | System for sludge, kitchen waste and reed carry out closed loop treatment |
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| CN202121817193.1U CN216027034U (en) | 2021-08-05 | 2021-08-05 | System for sludge, kitchen waste and reed carry out closed loop treatment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114873898A (en) * | 2022-05-12 | 2022-08-09 | 淮阴工学院 | Kitchen waste and municipal sludge co-processing system and processing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114873898A (en) * | 2022-05-12 | 2022-08-09 | 淮阴工学院 | Kitchen waste and municipal sludge co-processing system and processing method |
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