CN210764915U - Device for stripping and recycling extracellular polymer of excess sludge - Google Patents
Device for stripping and recycling extracellular polymer of excess sludge Download PDFInfo
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- CN210764915U CN210764915U CN201921407200.3U CN201921407200U CN210764915U CN 210764915 U CN210764915 U CN 210764915U CN 201921407200 U CN201921407200 U CN 201921407200U CN 210764915 U CN210764915 U CN 210764915U
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Abstract
The device for stripping and recycling the extracellular polymeric substances of the excess sludge comprises a sludge storage pool, an outlet of which is connected with an excess sludge pretreatment unit; the residual sludge pretreatment unit comprises a dosing premixing tank and a hydrocyclone, wherein the dosing premixing tank is used for adding a surfactant to sludge conveyed from the sludge storage tank and separating organic impurities; the hydrocyclone is used for stirring the sludge added with the surfactant in the dosing premixing tank at a high speed; the short-range anaerobic fermentation unit comprises a sludge anaerobic fermentation reactor; and the residual sludge dewatering unit comprises a sludge concentration tank and a dewatering and drying device. The utility model can efficiently realize the peeling of the extracellular polymer of the excess sludge while ensuring the activity of the microorganism in the excess sludge; realizes the conversion of carbon sources which are difficult to utilize in the excess sludge to high-value carbon sources which are easy to utilize.
Description
Technical Field
The utility model relates to a sewage sludge's biological treatment technical field especially relates to a device that is used for extra cellular polymer of excess sludge to peel off and resourceization.
Background
The average production amount of the surplus sludge in the whole country in nearly five years is about 4760 million tons/year (80% of water content) in the sewage treatment process, nearly 5300 million tons in nearly 2020 is estimated, the treatment and disposal cost usually accounts for 30-40% of the total operation cost of sewage treatment, and the national sludge treatment and disposal investment in 2020 is estimated to be 600 billion in 450 years. The residual sludge contains a large amount of organic matters, wherein TCOD is about 780-980mg/gTSS, TN is about 20-60mg/gTSS, and TP is about 2.5-5mg/gTSS, so that the residual sludge is a waste which has potential to be converted into useful resources. Extracellular polymers of the excess sludge are the third major component of microbial cells except cells and water, account for 50-90% of the total organic matters of the excess sludge, mainly comprise proteins, polysaccharides, humus and the like, are divided into TB-EPS, LB-EPS and soluble EPS from inside to outside in spatial structure, and the soluble and loosely combined EPS is easy to peel by a physicochemical method except that the TB-EPS is difficult to peel.
With the promulgation of the national discharge Standard of pollutants for municipal wastewater treatment plants in 2002, the highest discharge concentration of total nitrogen is improved, most domestic water plants cannot meet the requirements, the key reason is that the C/N of municipal wastewater in China is generally low, the requirement of denitrification cannot be met, and additional carbon sources generally need to be supplemented, but the CO of the wastewater treatment plant is increased2Discharge and increase residueAnd (5) residual sludge yield. The anaerobic fermentation can convert a complex carbon source in the sludge into a small-molecular short-chain fatty acid, the small-molecular short-chain fatty acid can be used as an efficient denitrification carbon source in a sewage plant, and the effective breaking of Extracellular Polymeric Substances (EPS) in the residual sludge is the key for improving the hydrolysis and subsequent biotransformation of the sludge. At present, the problems of huge sludge output, low resource utilization degree and difficult efficient pretreatment of excess sludge in a sewage treatment plant exist in sewage treatment.
SUMMERY OF THE UTILITY MODEL
In view of the above, the main object of the present invention is to provide a device for residual sludge extracellular polymeric substance detachment and resource utilization, which is intended to at least partially solve at least one of the above technical problems.
In order to achieve the above object, the present invention provides a device for peeling off and recycling extracellular polymers in excess sludge, which comprises a sludge storage tank, an excess sludge pretreatment unit, a short-distance anaerobic fermentation unit and an excess sludge dewatering unit, wherein:
the outlet of the sludge storage tank is connected with the residual sludge pretreatment unit and is used for storing the input sludge to be treated;
the residual sludge pretreatment unit comprises a dosing premixing tank and a hydrocyclone, wherein the dosing premixing tank is used for adding a surfactant to sludge conveyed from the sludge storage tank and separating organic impurities; the hydrocyclone is used for stirring the sludge added with the surfactant in the dosing premixing tank at a high speed;
the short-distance anaerobic fermentation unit comprises a sludge anaerobic fermentation reactor and is used for carrying out anaerobic fermentation treatment on the sludge subjected to high-speed separation treatment by the hydrocyclone;
and the residual sludge dewatering unit comprises a sludge concentration tank and a dewatering and drying device and is used for concentrating and drying the sludge after the short-range anaerobic fermentation unit performs fermentation treatment.
The device also comprises a secondary sedimentation tank, wherein the secondary sedimentation tank is used for concentrating and refluxing the activated sludge, and the outlet of the secondary sedimentation tank is connected with the sludge storage tank and the dosing premixing tank in the residual sludge pretreatment unit.
The top of the dosing premixing tank is provided with a dosing port and a stirring device;
wherein, the bottom of the sludge storage tank is connected with a residual sludge dewatering unit.
The sludge in the dosing premixing tank is conveyed into a hydrocyclone through a high-speed centrifugal pump, and the high-speed centrifugal pump and the hydrocyclone are combined to realize a high-speed hydrocyclone process;
the top and the bottom of the hydrocyclone are respectively connected with the dosing premixing tank and are additionally provided with control valves to form backflow, so that the required hydrocyclone circulation time is ensured.
The top of the sludge anaerobic fermentation reactor is provided with a stirring device, and a temperature control suite, a pH sensor and/or a DO sensor are/is additionally arranged in the main body of the sludge anaerobic fermentation reactor.
Based on the technical scheme, the device for stripping and recycling the residual sludge extracellular polymeric substances has at least one of the following beneficial effects compared with the prior art:
(1) the microbial activity in the excess sludge is ensured, and simultaneously the peeling of the extracellular polymeric substances of the excess sludge is efficiently realized;
(2) the yield of the excess sludge is effectively reduced;
(3) the conversion from the carbon source which is difficult to utilize in the excess sludge to the high-value carbon source which is easy to utilize is realized;
(4) the acid production by fermenting the excess sludge at a medium and low temperature can be realized;
(5) when the carbon source of raw water is insufficient and the carbon source requirement in the denitrification process is difficult to meet, the fermentation product can be used as a back-supply carbon source to promote the removal of total nitrogen.
Drawings
FIG. 1 is a schematic structural diagram of the device for efficiently stripping and recycling extracellular polymeric substances in excess sludge according to the present invention;
FIG. 2 is a flow chart of the method for efficient stripping and recycling of extracellular polymers in excess sludge according to the present invention;
FIG. 3 is a representation of extracellular polymer structural composition changes before and after excess sludge pretreatment;
FIG. 4 is a representation of the change in rheological properties of sludge before and after excess sludge pretreatment;
FIG. 5 is a representation of anaerobic fermentation acidogenic accumulation;
FIG. 6 is a graph showing the change in the concentration of excess sludge treated by the system.
In the above drawings, the reference numerals have the following meanings:
1. two heavy ponds 2, store up mud pond
3. Dosing premixing pool 4 and high-speed hydrocyclone
5. Sludge anaerobic fermentation reactor 6 and excess sludge dewatering unit
1.1, a secondary sedimentation tank dredge pump 1.2 and a dredge valve
2.1, 2.2, adding medicine premixing pool mud-feeding pump
3.1, medicine adding port 3.2, high-speed centrifugal pump
4.1, rotational flow sediment reflux valve 4.2 and mud outlet valve of hydrocyclone
4.4 swirl sludge reflux valve
5.1, DO/pH detector 5.2, anaerobic fermentation reactor mud valve
5.3, a heating and heat-preserving control suite 5.4 and a dredge pump
6.1 sludge inlet pump of sludge concentration tank
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings.
The utility model provides a method for effectively peeling off excess sludge Extracellular Polymeric Substance (EPS), which shortens the time of complex carbon source biotransformation in the excess sludge and improves the conversion rate of high-valued products prepared from the excess sludge.
Specifically, the device for stripping and recycling the extracellular polymeric substances in the excess sludge comprises a sludge storage tank, an excess sludge pretreatment unit, a short-range anaerobic fermentation unit and an excess sludge dehydration unit, wherein:
the outlet of the sludge storage tank is connected with the residual sludge pretreatment unit and is used for storing the input sludge to be treated;
the residual sludge pretreatment unit comprises a dosing premixing tank and a hydrocyclone, wherein the dosing premixing tank is used for adding a surfactant to sludge conveyed from the sludge storage tank and separating organic impurities; the hydrocyclone is used for stirring the sludge added with the surfactant in the dosing premixing tank at a high speed;
the short-distance anaerobic fermentation unit comprises a sludge anaerobic fermentation reactor and is used for carrying out anaerobic fermentation treatment on the sludge subjected to high-speed separation treatment by the hydrocyclone;
and the residual sludge dewatering unit comprises a sludge concentration tank and a dewatering and drying device and is used for concentrating and drying the sludge after the short-range anaerobic fermentation unit performs fermentation treatment.
The device also comprises a secondary sedimentation tank, wherein the secondary sedimentation tank is used for concentrating and refluxing the activated sludge, and the outlet of the secondary sedimentation tank is connected with the sludge storage tank and the dosing premixing tank in the residual sludge pretreatment unit.
The top of the dosing premixing tank is provided with a dosing port and a stirring device;
preferably, the bottom of the sludge storage tank is connected with a residual sludge dewatering unit.
The sludge in the dosing premixing tank is conveyed into a hydrocyclone through a high-speed centrifugal pump, and the high-speed centrifugal pump and the hydrocyclone are combined to realize a high-speed hydrocyclone process;
preferably, the top and the bottom of the hydrocyclone are respectively connected with a dosing premixing tank and are additionally provided with a control valve to form backflow, so as to ensure the required hydrocyclone cycle time.
The top of the sludge anaerobic fermentation reactor is provided with a stirring device, and a temperature control suite, a pH sensor and/or a DO sensor are/is additionally arranged in the main body of the sludge anaerobic fermentation reactor.
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and examples.
As shown in figure 1, the utility model provides a device that is used for extracellular polymer of excess sludge high efficiency to peel off and resourceization, the device includes that secondary sedimentation tank 1, storage mud pond 2, adds medicine and mixes pond 3, high-speed centrifugal pump 3.2, hydrocyclone 4, mud anaerobic fermentation reactor 5, excess sludge dewatering unit 6 in advance. The device comprises a sludge storage tank 2, a residual sludge dewatering unit 6, a residual sludge pretreatment unit and a short-range anaerobic fermentation unit, wherein the residual sludge pretreatment unit is arranged between the sludge storage tank 2 and the residual sludge dewatering unit 6, the sludge pretreatment unit consists of a dosing premixing tank 3, a high-speed centrifugal pump 3.2 and a hydrocyclone 4, the sludge storage tank 2 is respectively connected with the dosing premixing tank 3 and the residual sludge dewatering unit 6, and the dosing premixing tank 3 is sequentially connected with the high-speed hydrocyclone 4, the residual sludge anaerobic fermentation reactor 5 and the residual sludge dewatering unit 6 through the high-speed centrifugal pump 3.2. The top of the dosing premixing tank 3 is provided with a dosing port 3.1 and a stirring device, the dosing premixing tank 3 is connected with the sludge storage tank 2 through a sludge inlet pump 2.2, is connected with the secondary sedimentation tank through a sludge inlet valve 1.2 and a water inlet pipe, and is connected with the hydrocyclone 4 through a high-speed centrifugal pump 3.2. The high-speed hydrocyclone process is realized by combining a high-speed centrifugal pump 3.2 and a hydrocyclone 4, the top and the bottom of the hydrocyclone 4 are respectively connected with a dosing premixing tank 3 and additionally provided with control valves 4.1 and 4.4 to form backflow so as to ensure the required hydrocyclone cycle time, and the hydrocyclone 4 is respectively connected with the dosing premixing tank 3 and the sludge anaerobic fermentation reactor 5 through the high-speed centrifugal pump 3.2 and a sludge discharge pipe valve 4.2. The top of the sludge anaerobic fermentation reactor 5 is provided with a stirring device, the reactor main body is additionally provided with the temperature control suite 5.3, the reactor is additionally provided with a pH sensor 5.1 and a DO sensor 5.1, and the bottom is connected with a residual sludge dewatering unit 6 through a sludge discharge valve 5.2 and a sludge inlet pump 5.4 of a concentration tank.
As shown in fig. 2, the present invention also provides an operation process of the method for implementing efficient stripping and recycling of extracellular polymer in excess sludge:
(1) injecting the residual sludge in the secondary sedimentation tank into a sludge storage tank for temporary storage for 1-3 d, starting a sludge inlet valve and a sludge inlet pump, injecting the sludge in the sludge storage tank and the sludge at the inlet of the secondary sedimentation tank into a dosing premixing tank in proportion, and uniformly mixing by stirring; in the step, the residual sludge in the dosing tank is formed by mixing the temporary sludge in the sludge storage tank and the sludge at the inlet of the secondary sedimentation tank according to the proportion of 1: 1. Sludge in a sludge storage tank of a certain urban sewage treatment plant in the north is mixed by sludge from an inlet of a secondary sedimentation tank to prepare 15-18g/L of residual sludge, the residual sludge is added into a dosing premixing tank, a stirring device is started, dissolved oxygen control is performed, and the dissolved oxygen is adjusted to be between 0.05-1.0mg/L and the pH value is between 6.5-8.0.
(2) Adding the surfactant according to the sludge concentration of the residual sludge mixed in the dosing tank in proportion, and fully and uniformly stirring; in the step, the surfactant with the concentration of 0.005-0.1 g/g TSS is added according to the sludge concentration of the residual sludge mixed in the dosing pool in proportion. The rhamnolipid with the concentration of 23-25% is used as a surface active agent, the adding amount is 0.34-6.8 g/L, a stirring device is started to adjust the rotating speed, and the mixed sludge and the rhamnolipid are fully and uniformly stirred on the premise of producing bubbles as little as possible.
(3) Opening the high-speed centrifugal pump, the rotational flow sludge reflux valve and the rotational flow sediment reflux valve to enable the residual sludge treated by the biosurfactant to enter the hydrocyclone at a high speed and rotate continuously for a plurality of cycles; in the step, the excess sludge treated by the biosurfactant enters a hydrocyclone at a high speed and continuously swirls for a plurality of cycles for 0.5-20 min, and the main principle is that the excess sludge extracellular polymers subjected to solubilization treatment by the biosurfactant are quickly stripped from excess sludge cells and sludge flocs by utilizing the physical action of the high-speed hydrocyclone, so that the excess sludge extracellular polymers are converted into soluble organic matters which are more easily utilized by fermentation acid-producing bacteria.
(4) Opening a mud outlet valve of a water flow swirler, then closing a rotational flow sludge reflux valve and a rotational flow sediment reflux valve, injecting the pretreated excess sludge into the excess sludge anaerobic fermentation reactor, and monitoring and controlling the operating conditions and parameters of a fermentation system through a temperature control kit and pH and DO sensors; in the step (4), injecting the pretreated excess sludge into the excess sludge anaerobic fermentation reactor, fermenting for 2-10 days, and monitoring and controlling parameters such as temperature of a fermentation system through a temperature control kit and pH and DO sensors, wherein the temperature is controlled to be 25-40 ℃, the pH is 6.5-8.0, and the DO is 0.05-1.0;
(5) and opening a sludge discharge valve and a sludge discharge pump of the anaerobic fermentation reactor, discharging the fermented sludge in the anaerobic fermentation reactor while leaving the seed sludge, and preparing for sequencing batch anaerobic fermentation of the sludge.
The fermentation time is adjusted by measuring the yield of short-chain fatty acid in the anaerobic fermentation process of the sludge. The best fermentation time is controlled to be 3d by taking the excess sludge of a sewage treatment plant in a certain city in the north as an example.
The specific implementation case is as follows:
the residual sludge for the experiment is municipal sewage treatment residual sludge of a certain sewage treatment plant in the north (TCOD is 780-doped 980mg/gTSS, TN is 20-60mg/gTSS, TP is 2.5-5mg/gTSS), the effective volume of the used dosing premixing tank is 60L, the power of the high-speed centrifugal pump is 50HZ, the rotating speed is 3000r/min, the effective volume of the anaerobic fermentation reactor is 30L, the residual sludge is fermented in a sequencing batch mode, 10-15% of anaerobic activated sludge is inoculated, and the SRT in the fermentation system is 3-5 d. The specific operation process and operation effect are as follows:
(1) injecting the residual sludge in the secondary sedimentation tank into a sludge storage tank for temporary storage for 1-3 days, starting a sludge inlet valve and a sludge inlet pump, uniformly stirring and mixing the sludge in the sludge storage tank and the sludge at the inlet of the secondary sedimentation tank according to the ratio of 1: 1 to prepare a residual sludge head of about 17000mg/L, adding the residual sludge head into a dosing premixing tank, starting a stirring device and dissolved oxygen control, and adjusting the dissolved oxygen to about 0.3mg/L and the pH value to about 6.8.
(2) According to the sludge concentration of the residual sludge mixed in the dosing pool in proportion, rhamnolipid with the concentration of 0.34-6.8 g/L is added. And (3) starting a stirring device to adjust the rotating speed, and fully and uniformly stirring the mixed sludge and the rhamnolipid on the premise of generating bubbles as little as possible.
(3) And opening the high-speed centrifugal pump, the rotational flow sludge reflux valve and the rotational flow sediment reflux valve to enable the residual sludge treated by the biosurfactant to enter the hydraulic cyclone at a high speed and rotate continuously for 0.5-20 min.
(4) Opening a mud outlet valve of a water flow swirler, then closing a rotational flow sludge reflux valve and a rotational flow sediment reflux valve, injecting pretreated residual sludge into the residual sludge anaerobic fermentation reactor for fermentation for 3d, and monitoring and controlling the operating conditions and parameters of a fermentation system through a temperature control kit and pH and DO sensors to be as follows: controlling the temperature to be about 35 ℃, the pH to be about 6.8 and the DO to be about 0.3 mg/L;
(5) opening a sludge discharge valve and a sludge discharge pump of the anaerobic fermentation reactor, discharging the fermented sludge in the anaerobic fermentation reactor while leaving seed sludge, entering a sludge dewatering unit through a sludge discharge pipe, recovering fermentation liquor through concentration and filter pressing to extract short-chain fatty acid, or directly refluxing the pressure filtrate to a sewage treatment denitrification link to be used as a back-supplementing carbon source for sewage denitrification.
The utility model is used for treating the excess sludge of the urban sewage treatment plant, the pretreated sludge is subjected to anaerobic fermentation, the accumulation concentration of short-chain fatty acid is 2500mg/L, and the conversion rate is 240 mg/gVSS; then the fermented sludge passes through a dehydration unit of a sewage treatment plant, the TSS of the residual sludge is reduced by about 17 percent, and the recovery rate of short-chain fatty acid is about 3100 mg/L.
The technical principle of the utility model is as follows:
the extracellular polymer of the excess sludge is the third major component of the microorganism except cells and water, accounts for about 70% of the total organic matters of the excess sludge, and mainly comprises protein, polysaccharide, humus and the like. The space structure is divided into a tightly combined extracellular polymer (TB-EPS), a loosely combined extracellular polymer (LB-EPS) and a Soluble extracellular polymer (solid EPS) from inside to outside, and the Soluble and loosely combined EPS is easy to be peeled off through a physicochemical method except that the TB-EPS is difficult to be peeled off. Biosurfactant and high-speed hydraulic cyclone can effectively realize the explaination and the dissolution of extracellular polymeric substance the utility model discloses can not cause a large amount of fracture nature injuries to active microbial cell in the condition setting range, guarantee biological activity when peeling off EPS, be favorable to the biomass of follow-up fermentation process to keep. As shown in table 1 and fig. 3, fig. 3 is a transmission electron microscope image of the excess sludge before and after the treatment with biosurfactant and the high-speed hydrocyclone, which can significantly show that the extracellular polymeric substances of the excess sludge can be effectively stripped in the pretreatment process (indicated by arrows in the figure). Wherein a and c are original excess sludge; b and d are residual sludge after pretreatment. Under the solubilization of the biosurfactant and the physical separation of the hydrocyclone, more loose EPS is stripped to become soluble EPS and converted to soluble organic matter (DOM). The rheological property of the residual sludge after the pretreatment is obviously improved, and the viscosity and the viscoelasticity parameters of the sludge show an obvious descending trend, as shown in figure 4. Fig. 4 is a graph showing the change of rheological properties of the excess sludge before and after pretreatment, which significantly shows that the pretreatment method of coupling the biosurfactant and the high-speed hydrocyclone improves the rheological properties of the excess sludge: the viscosity and viscoelasticity are reduced. Wherein, (a, b) is a viscosity change curve, and (c, d) is a viscoelasticity change curve; the (a, c) is original excess sludge, and the (b, d) is pretreated excess sludge. The method is not only beneficial to further stripping of sludge extracellular polymers, but also beneficial to the mass transfer process in the anaerobic fermentation process.
The residual sludge enters an anaerobic fermentation reactor for acid-producing fermentation after being stripped by extracellular polymers, and mainly adopts the process of converting complex macromolecular organic matters into micromolecular organic matters by utilizing anaerobic fermentation acid-producing bacteria in a metabolic mode, so that the conversion effect of microorganisms is effectively improved by effective stripping and dissolving of the extracellular polymers. The environment is favorable for the reproduction of the fermentation acid-producing bacteria to inhibit the growth of methanogenic bacteria by controlling the conditions of pH, DO, temperature and the like, the acid-producing accumulation can be promoted, and the results of acid-producing fermentation by the utility model are shown in figure 5. FIG. 5 shows that a large amount of short-chain fatty acids are accumulated in the treatment process of pretreatment, anaerobic fermentation and the like of excess sludge, and the maximum acid production accumulation of anaerobic fermentation after the extracellular polymeric substances are stripped can reach more than 3 times of that of the original excess sludge. Wherein, O: raw excess sludge, P: pretreating excess sludge, F: anaerobic fermentation of the sludge. After the pretreatment and the anaerobic fermentation, the organic matters of the excess sludge are more fully utilized and converted into micromolecular organic matters such as short chain fatty acids which are more easily utilized by microorganisms, so the utility model discloses can effectively realize the reduction of the sludge, the result is as shown in figure 6. FIG. 6 shows that residual sludge extracellular polymeric substance stripping can effectively realize sludge reduction. Wherein B3S1, BSS2, B3S3 and B3S4 are marked for the excess sludge pretreatment method.
TABLE 1 structural composition change of extracellular polymeric substances after pretreatment of excess sludge for extracellular polymeric substance exfoliation and anaerobic fermentation
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. The device for stripping and recycling the extracellular polymers in the excess sludge is characterized by comprising a sludge storage tank, an excess sludge pretreatment unit, a short-range anaerobic fermentation unit and an excess sludge dehydration unit, wherein:
the outlet of the sludge storage tank is connected with the residual sludge pretreatment unit and is used for storing the input sludge to be treated;
the residual sludge pretreatment unit comprises a dosing premixing tank and a hydrocyclone, wherein the dosing premixing tank is used for adding a surfactant to sludge conveyed from the sludge storage tank and separating organic impurities; the hydrocyclone is used for stirring the sludge added with the surfactant in the dosing premixing tank at a high speed;
the short-distance anaerobic fermentation unit comprises a sludge anaerobic fermentation reactor and is used for carrying out anaerobic fermentation treatment on the sludge subjected to high-speed separation treatment by the hydrocyclone;
and the residual sludge dewatering unit comprises a sludge concentration tank and a dewatering and drying device and is used for concentrating and drying the sludge after the short-range anaerobic fermentation unit performs fermentation treatment.
2. The apparatus according to claim 1, further comprising a secondary sedimentation tank for concentrating and refluxing the activated sludge, wherein an outlet of the secondary sedimentation tank is connected with the sludge storage tank and the dosing premixing tank in the residual sludge pretreatment unit.
3. The device of claim 1, wherein a dosing port and a stirring device are arranged at the top of the dosing premixing tank.
4. The apparatus according to claim 1, wherein the bottom of the sludge storage tank is connected to a residual sludge dewatering unit.
5. The device of claim 1, wherein the sludge in the dosing premix tank is delivered to a hydrocyclone by a high-speed centrifugal pump, and the high-speed centrifugal pump and the hydrocyclone are combined to realize a high-speed hydrocyclone process.
6. The apparatus of claim 1, wherein the top and bottom of the hydrocyclone are connected to a dosing premix tank and a control valve is added to form a backflow for ensuring a desired hydrocyclone cycle time.
7. The device of claim 1, wherein a stirring device is arranged at the top of the anaerobic sludge fermentation reactor, and a temperature control kit, a pH sensor and/or a DO sensor are/is additionally arranged in the main body of the anaerobic sludge fermentation reactor.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110436729A (en) * | 2019-08-27 | 2019-11-12 | 中国科学院生态环境研究中心 | Device and method for excess sludge extracellular polymeric removing and recycling |
| CN111847692A (en) * | 2020-08-01 | 2020-10-30 | 北京建筑大学 | Pollution-free integration method and device for recycling extracellular polymers with high additional values |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110436729A (en) * | 2019-08-27 | 2019-11-12 | 中国科学院生态环境研究中心 | Device and method for excess sludge extracellular polymeric removing and recycling |
| CN110436729B (en) * | 2019-08-27 | 2024-09-27 | 中国科学院生态环境研究中心 | Device and method for stripping and recycling extracellular polymers of excess sludge |
| CN111847692A (en) * | 2020-08-01 | 2020-10-30 | 北京建筑大学 | Pollution-free integration method and device for recycling extracellular polymers with high additional values |
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