CN111439906A - Biogas residue circulating hydrothermal reduction system and technology - Google Patents
Biogas residue circulating hydrothermal reduction system and technology Download PDFInfo
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Abstract
The invention discloses a biogas residue circulating hydrothermal reduction system, which comprises a hydrothermal system, an anaerobic separation system and an organic dehydrator, wherein the hydrothermal system is connected with the anaerobic separation system through a pipeline; the hydrothermal system, the anaerobic separation system and the organic dehydrator are connected through a pump, and the discharge end of the organic dehydrator is communicated with the hydrothermal system; the process has high resource degree; the organic matter removal rate of the conventional hydrothermal-anaerobic digestion process is generally 55-65%; the process can improve the organic matter removal rate of the system to 70-80 percent, and correspondingly improve the biogas yield.
Description
Technical Field
The invention relates to the technical field of treatment of municipal biomass wastes such as sludge, food waste, livestock and poultry manure and the like, in particular to a biogas residue circulating hydrothermal reduction system and a biogas residue circulating hydrothermal reduction process.
Background
Hydrothermal Modification (Hydrothermal Modification), or Thermal Hydrolysis (Thermal Hydrolysis), refers to a process of heating biomass with high water content to a certain temperature and pressure in a sealed manner, and maintaining the temperature for a period of time to destroy the cell structure therein and promote Hydrolysis of macromolecular organic substances. Under such conditions, the biomass (polysaccharides, fats, proteins, and various cellular materials) is subject to accelerated denaturation and hydrolysis, as occurs in the process of cooking food in an autoclave. The cell structure of the biomass subjected to the hydrothermal modification treatment is destroyed, the high molecular organic matters are broken into smaller molecules, and the organic matters are more easily used as raw materials for metabolism by living cells, particularly more easily used by anaerobic bacteria. The remaining particulate matter becomes more easily dehydrated as intracellular water, interstitial water and capillary water are converted to free water due to the destruction of cellular structures.
The national department of environmental protection was released in 2010, 2 months, in h j-BAT-002, "best possible technical guidelines (trial) for pollution control in sludge treatment and disposal in urban wastewater treatment plants", which recommends hydrothermal technology as a new technology for sludge anaerobic digestion pretreatment, and describes the principle thereof; introduction and recommendation of hydrothermal technology have also been introduced and recommended by institutional and improvement committee in technical guidelines (trial) for sludge treatment and disposal in municipal wastewater treatment plant, which was jointly released in 2011 at 3 months. A hydrothermal-anaerobic technical route is adopted for municipal sludge with the volume of more than 6000t/d in Beijing cities, and hydrothermal pretreatment technical routes are adopted for Shenzhen, Guangzhou, Tianjin, Changsha, Shaoyang, Zibo, North sea, Hefei, Zhenjiang, Xiangyang, copper kernel, Zunyi, Huaian and other cities. Besides sludge, high-organic-content biomass wastes such as kitchen waste, fecal sludge and the like can also be subjected to resource recycling, reduction, quality improvement and efficiency improvement by adopting hydrothermal as a pretreatment technology.
In order to further exert the resource and reduction advantages of the hydrothermal technology, the patent provides a biogas residue circulating hydrothermal mode.
Disclosure of Invention
The invention aims to provide a biogas residue circulating hydrothermal reduction system and a biogas residue circulating hydrothermal reduction process aiming at the problems, so that the problems of low recycling and unobvious reduction of the hydrothermal process in the prior art are solved. The method specifically comprises the following steps: organic and inorganic separation is carried out on the biogas residues subjected to hydrothermal anaerobic digestion, the organic biomass part is concentrated and dehydrated and then enters the hydrothermal system again for pretreatment, the anaerobic digestion performance of the biogas residues is improved, the biodegradation performance of the biogas residues is improved, the biogas yield is increased, and the residue production of the system is reduced.
The technical scheme adopted by the invention is as follows:
a biogas residue circulating hydrothermal decrement system comprises a hydrothermal system, an anaerobic separation system and an organic dehydrator; the hydrothermal system, the anaerobic separation system and the organic dehydrator are connected through a pump, and the discharge end of the organic dehydrator is communicated with the hydrothermal system.
Preferably, the anaerobic separation system comprises an anaerobic system and an organic-inorganic separation system, the hydrothermal system is sequentially connected with the organic-inorganic separation system and the anaerobic system, and the anaerobic system is connected with the organic dehydrator.
Preferably, the anaerobic separation system comprises an anaerobic system and an organic-inorganic separation system, the hydrothermal system is sequentially connected with the anaerobic system and the organic-inorganic separation system, and the organic-inorganic separation system is connected with the organic dehydrator.
Preferably, the system further comprises an inorganic dewatering machine and a biogas treatment system.
Preferably, the organic-inorganic separation system is a high-efficiency cyclone separator or a centrifuge with a low separation factor.
The invention provides a biogas residue circulating hydrothermal reduction process, which comprises the following specific steps:
the method comprises the following steps: temporarily storing the biomass raw material and the recovered organic filter residue in a raw material storage bin;
step two: pumping the mixed raw materials to a hydrothermal system for hydrothermal reaction, and introducing the mixed raw materials to an organic-inorganic separation system for separation;
step three: and pumping the separated organic biomass to an anaerobic system for anaerobic reaction, then conveying the organic biomass to an organic dehydrator for dehydration, and conveying the organic biogas residues to the first step for circular treatment.
The invention provides another biogas residue circulating hydrothermal reduction process, which comprises the following specific steps:
the method comprises the following steps: temporarily storing the biomass raw material and the recovered organic filter residue in a raw material storage bin;
step two: pumping the mixed raw material to a hydrothermal system for hydrothermal reaction, and introducing the mixed raw material to an anaerobic system for anaerobic reaction;
step three: and pumping the organic biomass subjected to the anaerobic reaction to an inorganic-inorganic separation system for separation, then conveying the organic biomass to an organic dehydrator for dehydration, and conveying the organic biogas residues to the first step for circular treatment.
Preferably, the process further comprises,
step four: the inorganic biomass is pumped to an inorganic dehydrator for solid-liquid separation, and the separated organic filtrate enters a filtrate buffer tank for temporary storage;
step five: part of the dehydration filtrate flows back and is used for diluting and flushing an organic-inorganic separation system; and discharging the rest part of the dehydration filtrate to a sewage treatment plant for treatment.
Preferably, the biogas generated after the anaerobic reaction enters a biogas cabinet for temporary storage and buffering, then is introduced into a desulfurizing tower to remove hydrogen sulfide, and then enters a biogas boiler for combustion to generate raw material steam required by a hydrothermal system. In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
(1) the process has high resource degree; the organic matter removal rate of the conventional hydrothermal-anaerobic digestion process is generally 55-65%; the process can improve the organic matter removal rate of the system to 70-80 percent, and correspondingly improve the biogas yield.
(2) The process has high reduction degree; as shown in (1), the total solid content is greatly reduced, the organic and inorganic biomass is effectively separated, the dehydration performance is obviously improved, and the reduction rate of the process can reach 80 to 90 percent
(3) The investment and the occupied area are saved, the existing hydrothermal and anaerobic digestion treatment system is utilized, no additional treatment facility is added, the efficient utilization is realized, and the cost is reduced.
(4) After the organic matters and the inorganic matters in the biomass are effectively separated, the resource utilization value can be improved; the inorganic biomass has excellent dehydration performance, can obtain mud cakes with high solid content, and is convenient for subsequent building materials to be utilized or used as landfill covering soil.
(5) Combining anaerobic digestion process. Because the inorganic components in the biomass are separated, the problems of reduction of effective tank capacity of the digestion tank, pipeline blockage and the like caused by deposition and agglomeration of sand in the biomass in the digestion tank can be prevented.
(6) After the organic matter and the inorganic matter of the biomass are separated, the selection of the final mud cake treatment process is more targeted, the corresponding investment is more saved, and the operation is more reliable.
Drawings
FIG. 1 is a schematic view of an overall processing system according to embodiment 1 of the present invention;
FIG. 2 is a schematic view of an integrated treatment system of a "hydrothermal-separation-anaerobic" process in an embodiment of the present invention;
FIG. 3 is a schematic view of the overall treatment system of the "hydrothermal-anaerobic-separation" process in an embodiment of the present invention;
fig. 4 is a schematic view of a prior art flow processing system in embodiment 1 of the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract) may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature.
Example 1
As shown in fig. 1, a biogas residue circulating hydrothermal decrement system comprises a raw material storage bin, a slurrying reactor, a hydrothermal reactor, a flash evaporation reactor, a cooler, an anaerobic sludge inlet buffer tank, an anaerobic reactor, an anaerobic sludge outlet treatment system, a biogas treatment system and a filtrate buffer tank; the material warehouse, the slurrying reactor, the hydrothermal reactor, the flash evaporation reactor, the cooler, the anaerobic sludge inlet buffer tank and the anaerobic reactor sequentially pass through the pipeline connection, the steam outlet end of the flash evaporation reactor is connected with the slurrying reactor, the hydrothermal reactor is connected with the methane treatment system, the anaerobic sludge outlet treatment system is connected with the anaerobic reactor, and the organic filter residue outlet end of the anaerobic sludge outlet system is connected with the raw material warehouse.
The sludge outside the plant or the dewatered sludge in the sewage treatment plant is transported by a truck and temporarily stored in a raw material storage bin for the production and operation of a subsequent system.
The slurrying reactor is connected with a hydrothermal reactor through a hydrothermal feed pump, the hydrothermal reactor is connected with a flash evaporation reactor through a pipeline, the steam outlet end of the flash evaporation reactor is connected with the slurrying reactor, and the flash evaporation reactor is connected with a hydrothermal sludge buffer tank through a pipeline; and the steam outlet end of the methane treatment system is connected with the hydrothermal reaction.
By the structure, the raw sludge stored in the raw material storage bin is introduced into the slurry reactor, and the raw material is preheated to 95-100 ℃ by flash steam from the flash reactor; then pumping the sludge into a hydrothermal reactor through a hydrothermal feed pump, and heating the sludge in the hydrothermal reactor to 160-185 ℃ by steam generated by a methane treatment system; then the sludge automatically flows into a flash evaporation reactor through pressure difference, flash evaporation steam is obtained while the temperature and the pressure of the sludge flash evaporation reactor are reduced, the flash evaporation steam is recycled into a slurrying reactor, and the temperature of flash evaporation sludge is 95-105 ℃; the flash evaporation sludge is cooled to 35-55 ℃ through a sludge cooler, enters an anaerobic feeding buffer tank, and is pumped into an anaerobic reactor for fermentation and biogas production.
The reflux of the flash steam of the flash reactor is used in the system, so that the raw sludge is heated in advance, the subsequent reaction is accelerated, the heat in the flash steam is recovered, the energy is saved, and the efficiency is optimized.
The biogas treatment system comprises a biogas cabinet, a torch, a biogas desulfurization tower and a biogas boiler, the anaerobic reactor is connected with the biogas cabinet, the biogas cabinet is respectively connected with the torch and the biogas desulfurization tower, the biogas desulfurization tower is connected with the biogas boiler, and desulfurized biogas is combusted in the biogas boiler to generate raw material steam required by the hydrothermal system;
based on the structure, the biogas generated by the anaerobic reactor enters a biogas cabinet for temporary storage and buffering, then is introduced into a desulfurizing tower through a booster fan to remove hydrogen sulfide, and then enters a biogas boiler for combustion to generate raw material steam required by a hydrothermal system; the torch is used for burning methane when the boiler is stopped.
The anaerobic sludge-discharging treatment system comprises an anaerobic sludge-discharging buffer tank, an organic-inorganic separation device, an inorganic sludge buffer tank, an organic dehydrator and an inorganic dehydrator; the discharge end of the anaerobic reactor is connected with an anaerobic sludge discharge buffer tank, the anaerobic sludge discharge buffer tank is connected with an organic-inorganic separation device, one end of the organic-inorganic separation device is connected with an organic sludge buffer tank, and the other end of the organic-inorganic separation device is connected with a sludge buffer tank; one end of the organic sludge buffer tank is connected with the organic dehydrator, and the other end of the organic sludge buffer tank is connected with the filtrate buffer tank; the organic dehydrator is connected with the raw material storage bin; the inorganic sludge buffer tank is connected with an inorganic dehydrator, and the inorganic dehydrator is connected with the filtrate buffer tank; and the filtrate buffer tank is connected with the organic-inorganic separation device.
Based on the structure, the anaerobic sludge outlet buffer tank pumps sludge into an organic-inorganic separation device, the organic-inorganic separation device separates sludge, dilution and flushing water required by the organic-inorganic separation device come from a filtrate buffer tank, and the separated inorganic sludge enters the inorganic sludge buffer tank; the separated organic sludge enters an organic sludge buffer tank;
inorganic sludge is pumped to an inorganic dehydrator for solid-liquid separation, and the obtained inorganic sludge cake is transported outside for building material utilization or used as landfill soil covering; the separated inorganic filtrate enters a filtrate buffer tank for temporary storage;
pumping the sludge to an organic dehydrator for solid-liquid separation, pumping the obtained organic sludge cake (biogas residue) to a raw material storage bin, and performing hydrothermal-anaerobic digestion treatment again; the separated organic filtrate enters a filtrate buffer tank for temporary storage;
part of dehydrated filtrate in the filtrate buffer tank flows back and is used for diluting and washing the organic-inorganic separation device; and discharging the rest part of the dehydration filtrate to a sewage treatment plant for treatment.
The organic-inorganic separation device in the system is in the form of a high-efficiency cyclone separator or a centrifuge with low separation factor.
The organic matter removal rate of the conventional hydrothermal-anaerobic digestion process is generally 55-65%; the process can improve the organic matter removal rate of the system to 70-80 percent, and correspondingly improve the biogas yield; the system of the invention utilizes the existing hydrothermal and anaerobic digestion treatment system, does not additionally increase treatment facilities, and saves investment and land occupation; the system and the method of the invention greatly reduce the total solid content, effectively separate the organic and inorganic sludge, obviously improve the dehydration performance and lead the reduction rate of the process to reach 80 to 90 percent.
Through creative improvement of the inventor, an organic-inorganic separation device is arranged behind an anaerobic reactor, then the separated organic sludge is independently concentrated and dehydrated, and then the concentrated organic sludge cake flows back to a system for hydrothermal-anaerobic treatment again.
In the prior art, if an organic-inorganic separation device is not adopted, the same process purpose is realized, and the support is implemented according to the following process flow, as shown in fig. 2, the process flow of the system needs to be provided with a secondary hydrothermal, anaerobic and dehydration system, the water content of the finally dehydrated biogas residue is still high, the reduction degree is not high, the corresponding investment, occupied area and operation cost are greatly increased, and the result is half the effort.
Example 2
This example is similar to example 1, except that the positions of the anaerobic reactor and the organic-inorganic separation device are changed, the organic-inorganic separation is performed first, then the anaerobic reaction is performed,
the characteristics of the "hydrothermal-anaerobic-separation" ① process of example 1 and the "hydrothermal-separation-anaerobic" ② process of example 2 are:
the process ① firstly carries out anaerobic digestion on the hydrothermal sludge, can remove most organic matters in the sludge, reduces the solid load of a subsequent organic-inorganic separation system, has low total solid content of the subsequent separation system, needs less dilution and washing water, and has smaller equipment specification, low operation consumption and higher organic-inorganic separation purity of the separation system;
the process ② firstly carries out organic-inorganic separation on the hydrothermal sludge, and can prevent the problems of reduction of effective tank capacity of a digestion tank, pipeline blockage and the like caused by deposition and agglomeration of inorganic sand in the sludge in the digestion tank.
The fixed schemes provided by the embodiment 1 and the embodiment 2 can realize the organic matter removal rate of 70-80 percent, the biogas yield is correspondingly improved,
example 3
The invention also provides a biogas residue circulating hydrothermal reduction process, which comprises the following specific steps:
the method comprises the following steps: temporarily storing the sludge outside the plant or dewatered sludge in a sewage treatment plant in a raw material storage bin for subsequent production and operation of a system;
step two: pumping the raw sludge to a slurrying reactor, and preheating the raw sludge to 95-100 ℃ by flash steam from the flash reactor; then the mixture is pumped into a hydrothermal reactor through a hydrothermal feed pump and is heated to 160-185 ℃ by steam generated by a biogas boiler; then automatically flowing into a flash evaporation reactor through pressure difference, obtaining flash evaporation steam while reducing temperature and pressure, and recycling the flash evaporation steam into a slurrying reactor, wherein the temperature of flash evaporation sludge is 95-105 ℃;
step three: the flash evaporation sludge is cooled to 35-55 ℃ through a sludge cooler, enters an anaerobic feeding buffer tank and is pumped into an anaerobic reactor to be fermented and generate methane;
step four: the biogas enters a biogas cabinet for temporary storage and buffering, then is introduced into a desulfurizing tower through a booster fan to remove hydrogen sulfide, and then enters a biogas boiler for internal combustion to generate raw material steam required by a hydrothermal system; a biogas emergency torch is arranged in the anaerobic system and used for burning biogas when the boiler stops production;
step five: the discharged material and the bottom mud of the anaerobic reactor automatically flow into an anaerobic mud-discharging buffer tank; anaerobic sludge discharge pumps send organic-inorganic separation devices, required dilution and flushing water comes from a filtrate buffer tank, and separated inorganic sludge enters an inorganic sludge buffer tank; the separated organic sludge enters an organic sludge buffer tank; inorganic sludge is pumped to an inorganic dehydrator for solid-liquid separation, and the obtained inorganic sludge cake is transported outside for building material utilization or used as landfill soil covering; the separated inorganic filtrate enters a filtrate buffer tank for temporary storage;
pumping the sludge to an organic dehydrator for solid-liquid separation, pumping the obtained organic sludge cake (biogas residue) to a raw material storage bin, and performing hydrothermal-anaerobic digestion treatment again; the separated organic filtrate enters a filtrate buffer tank for temporary storage;
step six: part of the dehydration filtrate flows back and is used for diluting and washing the organic-inorganic separation device; and discharging the rest part of the dehydration filtrate to a sewage treatment plant for treatment.
Example 4
The invention also provides a biogas residue circulating hydrothermal reduction process, which comprises the following specific steps:
the method comprises the following steps: temporarily storing the sludge outside the plant or dewatered sludge in a sewage treatment plant in a raw material storage bin for subsequent production and operation of a system;
step two: pumping the raw sludge to a slurrying reactor, and preheating the raw sludge to 95-100 ℃ by flash steam from the flash reactor; then the mixture is pumped into a hydrothermal reactor through a hydrothermal feed pump and is heated to 160-185 ℃ by steam generated by a biogas boiler; then automatically flowing into a flash evaporation reactor through pressure difference, obtaining flash evaporation steam while reducing temperature and pressure, and recycling the flash evaporation steam into a slurrying reactor, wherein the temperature of flash evaporation sludge is 95-105 ℃;
step three: the flash evaporation sludge is cooled to 35-55 ℃ through a sludge cooler, enters an anaerobic feeding buffer tank, and is pumped to an organic-inorganic separation device for separation; the required dilution and washing water comes from the filtrate buffer tank, the separated inorganic sludge enters the inorganic sludge buffer tank, the inorganic sludge is pumped to an inorganic dehydrator for solid-liquid separation, and the obtained inorganic sludge cake is transported outside for building material utilization or used as landfill soil; the separated inorganic filtrate enters a filtrate buffer tank for temporary storage; the separated organic sludge enters an anaerobic reactor to generate biogas.
Step four: the biogas enters a biogas cabinet for temporary storage and buffering, then is introduced into a desulfurizing tower through a booster fan to remove hydrogen sulfide, and then enters a biogas boiler for internal combustion to generate raw material steam required by a hydrothermal system; a biogas emergency torch is arranged in the anaerobic system and used for burning biogas when the boiler stops production;
step five: the organic sludge after the anaerobic reaction is pumped to an organic dehydrator for solid-liquid separation, the obtained organic sludge cake (biogas residue) is pumped to a raw material storage bin for hydrothermal-anaerobic digestion treatment again; the separated organic filtrate enters a filtrate buffer tank for temporary storage;
step six: part of the dehydration filtrate flows back and is used for diluting and washing the organic-inorganic separation device; and discharging the rest part of the dehydration filtrate to a sewage treatment plant for treatment.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A biogas residue circulating hydrothermal decrement system is characterized by comprising a hydrothermal system, an anaerobic separation system and an organic dehydrator; the hydrothermal system, the anaerobic separation system and the organic dehydrator are connected through a pump, and the discharge end of the organic dehydrator is communicated with the hydrothermal system.
2. The biogas residue circulating hydrothermal reduction system according to claim 1, wherein: the anaerobic separation system comprises an anaerobic system and an organic-inorganic separation system, the hydrothermal system is sequentially connected with the organic-inorganic separation system and the anaerobic system, and the anaerobic system is connected with the organic dehydrator.
3. The biogas residue circulating hydrothermal reduction system according to claim 1, wherein: the anaerobic separation system comprises an anaerobic system and an organic-inorganic separation system, the hydrothermal system is sequentially connected with the anaerobic system and the organic-inorganic separation system, and the organic-inorganic separation system is connected with the organic dehydrator.
4. The biogas residue circulating hydrothermal reduction system according to claim 3 or 4, wherein: the system also comprises an inorganic dehydrator and a methane treatment system.
5. The biogas residue circulating hydrothermal reduction system according to claim 1, wherein: the organic-inorganic separation system is a high-efficiency cyclone separator or a centrifuge with low separation factor.
6. A biogas residue circulating hydrothermal reduction process is characterized in that: the method comprises the following specific steps:
the method comprises the following steps: temporarily storing the biomass raw material and the recovered organic filter residue in a raw material storage bin;
step two: pumping the mixed raw materials to a hydrothermal system for hydrothermal reaction, and introducing the mixed raw materials to an organic-inorganic separation system for separation;
step three: and pumping the separated organic biomass to an anaerobic system for anaerobic reaction, then conveying the organic biomass to an organic dehydrator for dehydration, and conveying the organic biogas residues to the first step for circular treatment.
7. A biogas residue circulating hydrothermal reduction process is characterized in that: the method comprises the following specific steps:
the method comprises the following steps: temporarily storing the biomass raw material and the recovered organic filter residue in a raw material storage bin;
step two: pumping the mixed raw material to a hydrothermal system for hydrothermal reaction, and introducing the mixed raw material to an anaerobic system for anaerobic reaction;
step three: and pumping the organic biomass subjected to the anaerobic reaction to an inorganic-inorganic separation system for separation, then conveying the organic biomass to an organic dehydrator for dehydration, and conveying the organic biogas residues to the first step for circular treatment.
8. The biogas residue circulating hydrothermal reduction process according to claim 6 or 7, characterized in that: the process also comprises the step of carrying out,
step four: the inorganic biomass is pumped to an inorganic dehydrator for solid-liquid separation, and the separated organic filtrate enters a filtrate buffer tank for temporary storage;
step five: part of the dehydration filtrate flows back and is used for diluting and flushing an organic-inorganic separation system; and discharging the rest part of the dehydration filtrate to a sewage treatment plant for treatment.
9. The biogas residue circulating hydrothermal reduction process according to claim 6 or 7, characterized in that: and (3) allowing biogas generated after the anaerobic reaction to enter a biogas cabinet for temporary storage and buffering, introducing the biogas into a desulfurizing tower to remove hydrogen sulfide, and then allowing the biogas to enter a biogas boiler for combustion to generate raw material steam required by a hydrothermal system.
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| CN105602844A (en) * | 2016-03-28 | 2016-05-25 | 上海万帝环境技术有限公司 | Kitchen waste medium-high-temperature combined anaerobic digestion equipment and anaerobic digestion method |
| CN206624871U (en) * | 2017-04-05 | 2017-11-10 | 青岛中科华通能源工程有限公司 | Sand setting for anaerobic fermentation removes system |
| CN208844075U (en) * | 2018-07-17 | 2019-05-10 | 北京首创环境科技有限公司 | A kind of anaerobic fermentation system with desanding function |
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Application publication date: 20200724 |