Method and device for strengthening sludge granulation

Abstract

The invention provides a method and device for strengthening sludge granulation, and relates to the technical field of sewage treatment and sludge treatment.The method comprises the following steps that S1, a sludge-water mixture containing microcarrier enriched granular sludge is cultured in a bioreactor; s2, feeding part of the sludge-water mixture containing the microcarrier enriched granular sludge obtained in the step S1 into a hydrocyclone, and screening the granular sludge for the first time to obtain first underflow sludge and first overflow sludge; s3, feeding the first overflow sludge into the hydrocyclone again, and screening the granular sludge for the second time to obtain second underflow sludge and second overflow sludge; s4, discharging the first underflow sludge and the second underflow sludge into a bioreactor for culturing; and S5, feeding the sludge-water mixture obtained in the step S4 into a hydrocyclone, and repeating the first screening in the step S2, the second screening in the step S3 and the step S4 until reinforced sludge granulation is completed. The formed granular sludge is stable in property.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment and sludge treatment, and in particular to a method and device for strengthening sludge granulation. Background Art

[0002] In modern society, with the accelerated development of industrialization and urbanization, sewage treatment issues have become increasingly prominent. In the field of wastewater treatment, sludge morphology is an important factor affecting the treatment effect. As the main by-product of sewage treatment, the treatment efficiency of sludge also directly affects the efficiency of the entire sewage treatment system. On the one hand, sludge granulation can improve the efficiency of sewage treatment and make the effluent water quality better and more stable. On the other hand, it can improve the sludge sedimentation performance, facilitate dehydration and subsequent resource utilization, and reduce treatment costs.

[0003] Although the existing sludge granulation technology has improved the treatment efficiency of sewage and sludge to a certain extent, it still has certain drawbacks. For example, the physical method can promote particle formation through mechanical stirring or ultrasonic treatment, but the energy consumption is high and the requirements for equipment are relatively strict; the chemical method can quickly form large particles by adding flocculants, but long-term use may burden the environment and increase treatment costs; although the biological method is environmentally friendly, it has low efficiency and is difficult to meet the needs of large-scale sewage treatment. Therefore, it is particularly important to develop an efficient, energy-saving and environmentally friendly sludge granulation method.

[0004] Microcarrier technology has been widely used in bioreactors, cell culture and other fields. Its principle is to promote the attachment and growth of cells or microorganisms through a suitable surface. In recent years, microcarrier technology has begun to be introduced into the field of sewage treatment. By adding microcarriers, the stability and sedimentation performance of sludge particles can be enhanced.

[0005] As an efficient solid-liquid separation equipment, hydrocyclone has the advantages of simple structure, convenient operation and high separation efficiency, and has been widely used in the field of wastewater treatment. It uses the centrifugal force generated by high-speed rotation to achieve solid-liquid separation based on gravity and increase the sludge concentration.

[0006] In the prior art, the process of combining hydrocyclones with microcarriers to cultivate granular sludge is limited by many factors, such as the timing of the use of the hydrocyclone, feed pressure, bottom flow port diameter, diversion ratio, sludge particle size, etc. The technical combination of the two needs to comprehensively consider the influence of various factors. For example, in patent CN 114873727, the particle size of the basic carrier particles is distributed in 30μm-100μm, the particle size is small, the cultivation cycle is long, and it is easy to lose after screening by the hydrocyclone. The composite microcarrier particles need to be replenished regularly, which increases the workload and cost of the system operation. In addition, in this patent, the separation device is only used once after the completion of the biochemical treatment, and the sludge in the sedimentation tank is sent to the separation device again after the sludge age reaches a certain level to recover the sludge particles in the secondary sedimentation tank, which will lead to the loss of target sludge and microcarriers.

[0007] Therefore, how to combine hydrocyclones with microcarriers to achieve efficient sludge granulation is a technical challenge. Summary of the invention

[0008] The purpose of the present invention is to provide a method and device for enhancing sludge granulation. The present invention utilizes the surface characteristics of microcarriers and the centrifugal sedimentation effect of hydrocyclones to solve the problems of low efficiency, complex operation, poor screening and enrichment effect, poor environmental adaptability and poor effect in sewage treatment in the process of screening and enriching granular sludge in traditional methods, provide strong support for the industrialization and large-scale production of granular sludge, and help promote the widespread application and sustainable development of new sewage treatment technologies.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] The present invention provides a method for enhancing sludge granulation, comprising the following steps:

[0011] S1: Cultivating a sludge-water mixture containing microcarrier-enriched granular sludge in a bioreactor;

[0012] S2: feeding the sludge-water mixture containing the microcarrier-enriched granular sludge obtained in step S1 into a hydrocyclone to perform a first screening of the granular sludge to obtain a first underflow sludge and a first overflow sludge;

[0013] Wherein, the volume ratio of the first underflow sludge to the first overflow sludge is 1:4 to 1:3;

[0014] S3: feeding the first overflow sludge into the hydrocyclone again to screen the granular sludge for the second time to obtain second underflow sludge and second overflow sludge;

[0015] Wherein, the volume ratio of the sum of the second underflow sludge and the first underflow sludge to the second overflow sludge is 9:16 to 7:9;

[0016] S4: discharging the first underflow sludge and the second underflow sludge into the bioreactor and mixing them with the remaining mud-water mixture containing the microcarrier-enriched granular sludge in the bioreactor and continuing to culture;

[0017] S5: feeding part of the mud-water mixture obtained in step S4 into the hydrocyclone, repeating the first screening of step S2, the second screening of step S3 and step S4 until the enhanced sludge granulation is completed; each time step S4 is repeated, the mud-water mixture containing microcarrier-enriched granular sludge remaining in the bioreactor is replaced by the remaining mud-water mixture obtained in step S4 except for the mud-water mixture entering the hydrocyclone when step S4 was performed last time.

[0018] Further, based on the above technical solution, the calculation formula for the sum of the volumes of the first underflow sludge and the second underflow sludge and the volume of the second overflow sludge includes:

[0019] V 底 =V 进 ×k1×(1+k2) Formula (1)

[0020] V 溢 =V 进 ×k2 2 Formula (2)

[0021] V 进 =V 底 +V 溢 Formula (3)

[0022] Among them, k1 = 1 / 5 ~ 1 / 4, k2 = 3 / 4 ~ 4 / 5;

[0023] V 进 is the volume of the mud-water mixture containing microcarrier-enriched granular sludge entering the hydrocyclone;

[0024] V 底 It is the sum of the volumes of the first underflow sludge and the second underflow sludge flowing out of the underflow outlet of the hydrocyclone;

[0025] V 溢 It is the volume of the second overflow sludge flowing out from the overflow port of the hydrocyclone.

[0026] Further, based on the above technical solution, the method for preparing the mud-water mixture containing microcarrier-enriched granular sludge comprises the following steps:

[0027] (1) pretreating the microcarrier;

[0028] (2) adding the pretreated microcarriers to domestic sewage containing flocculent activated sludge, mixing them evenly, and obtaining mixed domestic sewage;

[0029] (3) placing the mixed domestic sewage in step (2) in a bioreactor for culturing to obtain a sludge-water mixture containing microcarrier-enriched granular sludge.

[0030] Further, based on the above technical solution, in step (1), the pretreatment includes cleaning and disinfection;

[0031] And / or, in step (2), the dosage of the microcarrier is 1 g to 3 g per liter of domestic sewage containing flocculent activated sludge;

[0032] And / or, the microcarrier comprises one or more of activated carbon, struvite, ceramsite, and zeolite;

[0033] And / or, the particle size of the microcarrier is 200 to 400 μm;

[0034] And / or, in step (2), the concentration of the flocculent activated sludge in the domestic sewage containing flocculent activated sludge is 4000-5000 mg / L;

[0035] And / or, in step (2), the amount of domestic sewage containing flocculent activated sludge added is 40-60% of the volume of the bioreactor.

[0036] Further, based on the above technical solution, in step (3), the culture mode is anaerobic-aerobic-anoxic culture;

[0037] The anaerobic, aerobic and anoxic conditions are used as one culture cycle, and two culture cycles are continuously carried out in the bioreactor every day. Before the start of each culture cycle except the first culture cycle, domestic sewage with a flocculent activated sludge concentration of 4000-5000 mg / L is added to the bioreactor; the amount of domestic sewage added is 40-60% of the volume of the bioreactor; after each culture cycle, the bioreactor is left to stand for 20-30 minutes, and the supernatant is discharged;

[0038] In each cultivation cycle,

[0039] When the COD concentration of domestic sewage in the bioreactor is 60-80 mg / L, the anaerobic stage ends;

[0040] When the dissolved oxygen concentration of domestic sewage in the bioreactor is ≥1.0 mg / L, the aerobic stage ends;

[0041] After the domestic sewage in the bioreactor is stirred anoxically for 240 to 270 minutes, the stirrer is turned off and the anoxic stage ends;

[0042] And / or, in step (3), the culturing time is 9-12 days, preferably 10 days, and the temperature is 24-28°C.

[0043] Further, based on the above technical solution, the first screening and the second screening steps are the same, both comprising:

[0044] Feeding the mud-water mixture containing microcarrier-enriched granular sludge or the first overflow sludge into the hydrocyclone for spiral motion;

[0045] The sludge with larger particle size falls to the cone section under the action of inertial centrifugal force, and is discharged into the underflow sludge box through the underflow outlet to become the first underflow sludge or the second underflow sludge;

[0046] The flocculent sludge with smaller particle size is discharged from the overflow outlet into the overflow sludge box through the rising inner layer vortex flow, and becomes the first overflow sludge or the second overflow sludge;

[0047] The second overflow sludge is used as excess sludge.

[0048] Further, on the basis of the above technical solution, the inlet pressure of the hydrocyclone is 0.10-0.15 MPa, the bottom flow port diameter is 12-14 mm, and the split ratio is 20%-25%;

[0049] and / or, in step S2, the part of the sludge-water mixture containing microcarrier-enriched granular sludge obtained in step S1 fed into the hydrocyclone accounts for 40-60% of the volume of the total sludge-water mixture in the bioreactor;

[0050] and / or, in step S5, the part of the mud-water mixture obtained in step S4 fed into the hydrocyclone accounts for 40-60% of the volume of the total mud-water mixture in the bioreactor;

[0051] And / or, in step S5, the first screening of step S2, the second screening of step S3 and step S4 are repeated at least once every day.

[0052] Further, on the basis of the above technical solution, the culture mode in step S4 is anaerobic-aerobic-anoxic culture, with anaerobic, aerobic and anoxic as one culture cycle, the culture time in step S4 is 1 day, and two culture cycles are completed within 1 day;

[0053] Before each culture cycle, domestic sewage with a flocculent activated sludge concentration of 4000-5000 mg / L is added to the bioreactor; the amount of domestic sewage added is 40-60% of the volume of the bioreactor; after each culture cycle, the bioreactor is left to stand for 20-30 minutes, and then the supernatant is discharged;

[0054] In each cultivation cycle,

[0055] When the COD concentration of domestic sewage in the bioreactor is 60-80 mg / L, the anaerobic stage ends;

[0056] When the dissolved oxygen concentration of domestic sewage in the bioreactor is ≥1.0 mg / L, the aerobic stage ends;

[0057] After the domestic sewage in the bioreactor is stirred anoxically for 240 to 270 minutes, the stirrer is turned off and the anoxic stage ends.

[0058] The present invention also provides a device for enhancing sludge granulation used in the method for enhancing sludge granulation as described above, wherein the device is a hydrocyclone, comprising a feed inlet, an overflow outlet, an underflow outlet, a cyclone chamber, a cone section, an underflow sludge tank and an overflow sludge tank;

[0059] The feed port is connected to the cyclone chamber;

[0060] The top of the cyclone chamber is connected to an overflow outlet, and an overflow sludge box is provided below the overflow outlet;

[0061] The cyclone chamber is connected to a cone section below, and an underflow sludge box is arranged below the underflow outlet of the cone section.

[0062] Furthermore, based on the above technical solution, it also includes a peristaltic pump for discharging the overflow sludge in the overflow sludge box into the feed port.

[0063] The invention provides a method and device for enhancing sludge granulation, and the beneficial effects are as follows:

[0064] 1. The present invention utilizes the surface characteristics of microcarriers to improve the efficiency of sludge granulation, enhance the stability and sedimentation performance of sludge particles, and then combines the centrifugal sedimentation effect of the hydrocyclone to effectively screen the sludge, thereby achieving efficient, low-cost and environmentally friendly sludge granulation, thereby improving the overall efficiency of sewage treatment. The present invention brings breakthrough technological progress to the field of sewage treatment and provides a new solution for achieving efficient and environmentally friendly sewage treatment.

[0065] 2. The present invention provides a method and device for enhancing sludge granulation, which combines the centrifugal sedimentation effect of the hydrocyclone and the stable culture environment of the microcarrier, accelerates the screening and culture process of granular sludge. Compared with traditional methods, this method helps to quickly realize sludge granulation, greatly shortens the culture cycle, and the formed granular sludge is stable in nature and not easy to disintegrate.

[0066] 3. The technical solution of the present invention has a simple structure, is easy to operate, has high flexibility, does not require complicated equipment and operating steps, is easy to automate, and improves the feasibility of actual operation.

[0067] 4. The present invention provides a method and device for enhancing sludge granulation. The formed granular sludge has stable properties and is not easy to disintegrate. It can effectively remove pollutants in water bodies, thereby improving the efficiency and quality of sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0069] Figure 1 The principle diagram of the floc activated sludge provided by the present invention attached to the microcarrier to form microparticles;

[0070] Figure 2 The hydrocyclone screening and strengthening granular sludge device and principle diagram provided by the present invention;

[0071] Figure 3 This is a comparison of the sludge particle sizes before and after acclimation in Example 1 provided by the present invention;

[0072] Figure 4 A comparison chart of the relative abundance of anaerobic ammonia-oxidizing bacteria in activated sludge before and after acclimation in Example 1 provided by the present invention;

[0073] Marking Description:

[0074] 1. Microcarrier enriched granular sludge; 11. Flocculent activated sludge; 12. Microcarrier; 2. Hydrocyclone; 21. Feed inlet; 22. Overflow outlet; 23. Underflow outlet; 24. Cyclone chamber; 25. Cone section; 26. Underflow sludge box; 27. Overflow sludge box; 28. Peristaltic pump. DETAILED DESCRIPTION

[0075] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention. The process parameters of the following embodiments that do not specify specific conditions are usually based on conventional conditions.

[0076] The endpoints and any values ​​of the ranges disclosed in the present invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of each range, the endpoint values ​​of each range and the individual point values, and the individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be regarded as specifically disclosed in the present invention.

[0077] According to a first aspect of the present invention, there is provided a method for enhancing sludge granulation, comprising the following steps:

[0078] S1: Cultivating a sludge-water mixture containing microcarrier-enriched granular sludge in a bioreactor;

[0079] S2: feeding the sludge-water mixture containing the microcarrier-enriched granular sludge obtained in step S1 into a hydrocyclone to perform a first screening of the granular sludge to obtain a first underflow sludge and a first overflow sludge;

[0080] Wherein, the volume ratio of the first underflow sludge to the first overflow sludge is 1:4 to 1:3 (such as 1:3.8, 1:3.6, 1:3.4, 1:3.2, etc.);

[0081] Specifically, the volume ratio of the first underflow sludge and the first overflow sludge is determined according to the split ratio, which is the volume ratio of the underflow to the feed within a certain period of time. The volume ratio of the first underflow sludge and the first overflow sludge is 1:4 to 1:3, that is, the split ratio is 20% to 25%. At this time, the enrichment efficiency of the underflow granular sludge is the highest, and the target granular sludge can be obtained to the maximum extent. If it exceeds this range, assuming that the volume ratio of the first underflow sludge and the first overflow sludge is 1:5, that is, the split ratio is 17%, at this time, the target granular sludge is easy to flow out of the overflow, resulting in a decrease in the enrichment efficiency of the underflow target granular sludge.

[0082] S3: feeding the first overflow sludge into the hydrocyclone again to screen the granular sludge for the second time to obtain second underflow sludge and second overflow sludge;

[0083] Wherein, the volume ratio of the sum of the second underflow sludge and the first underflow sludge to the second overflow sludge is 9:16 to 7:9 (such as 9:14, 8:14, 8:12, 7:10, etc.);

[0084] Specifically, the volume ratio of the second underflow sludge to the second overflow sludge is consistent with the volume ratio of the first underflow sludge to the first overflow sludge, both of which are 1:4 to 1:3. After calculation, the volume ratio of the sum of the second underflow sludge and the first underflow sludge to the second overflow sludge is 9:16 to 7:9. At this time, the enrichment efficiency of the underflow granular sludge is the highest, and the target granular sludge can be obtained to the maximum extent. If it exceeds this range, such as 10:8, more activated sludge will remain in the underflow, resulting in a decrease in the separation efficiency of the microcarrier-enriched granular sludge in the underflow, and even causing the hydrocyclone to be blocked, making the machine unable to continue to operate.

[0085] S4: discharging the first underflow sludge and the second underflow sludge into the bioreactor and mixing them with the remaining mud-water mixture containing the microcarrier-enriched granular sludge in the bioreactor, and then continuing to culture to obtain the target sludge;

[0086] S5: feeding part of the mud-water mixture obtained in step S4 into the hydrocyclone, repeating the first screening of step S2, the second screening of step S3 and step S4 until the enhanced sludge granulation is completed; each time step S4 is repeated, the mud-water mixture containing microcarrier-enriched granular sludge remaining in the bioreactor is replaced by the remaining mud-water mixture obtained in step S4 except for the mud-water mixture entering the hydrocyclone when step S4 was performed last time.

[0087] Specifically, the operating conditions of the first screening in step S2 and the second screening in step S3 are exactly the same. In addition, more underflow sludge can be obtained by screening twice, which accelerates the cultivation of granular sludge and reduces the loss of microcarriers as much as possible.

[0088] Completing the enhanced sludge granulation in step S5 refers to obtaining granular sludge with a particle size range of 150 μm-1 mm. Sludge particles of different particle sizes can be selected for sewage treatment according to actual needs.

[0089] As an optional embodiment of the present invention, the calculation formula for the volume ratio of the sum of the volumes of the first underflow sludge and the second underflow sludge and the second overflow sludge includes:

[0090] V 底 =V 进 ×k1×(1+k2) Formula (1)

[0091] V 溢 =V 进 ×k2 2 Formula (2)

[0092] V 进 =V 底 +V 溢 Formula (3)

[0093] Among them, k1=1 / 5~1 / 4, k2=3 / 4~4 / 5 are determined according to the split ratio of underflow sludge and overflow sludge;

[0094] V 进 is the volume of the mud-water mixture containing microcarrier-enriched granular sludge entering the hydrocyclone;

[0095] V 底 It is the sum of the volumes of the first underflow sludge and the second underflow sludge flowing out of the underflow outlet of the hydrocyclone;

[0096] Voverflow is the volume of the second overflow sludge flowing out of the overflow port of the hydrocyclone.

[0097] As an optional embodiment of the present invention, Figure 1As shown, the method for preparing the mud-water mixture containing microcarrier-enriched granular sludge comprises the following steps:

[0098] (1) pre-treating the microcarrier 12;

[0099] (2) adding the pretreated microcarrier 12 to the domestic sewage containing flocculent activated sludge 11, mixing them evenly, and obtaining mixed domestic sewage;

[0100] (3) The mixed domestic sewage in step (2) is placed in a bioreactor for cultivation to obtain a sludge-water mixture containing microcarrier-enriched granular sludge 1.

[0101] Specifically, a part of the mud-water mixture containing the microcarrier-enriched granular sludge 1 is fed into a hydrocyclone for treatment, and the remaining part of the sludge is left idle until all the underflow sludge obtained in the hydrocyclone is discharged into the bioreactor again. The idle sludge and all the underflow sludge are mixed evenly and then cultured. After the culture is completed, it is discharged into the hydrocyclone again to repeat the cycle.

[0102] As an optional embodiment of the present invention, in step (1), the pretreatment includes cleaning and disinfection;

[0103] And / or, in step (2), the dosage of the microcarrier is 1 g to 3 g (e.g., 1.5 g, 2 g, 2.5 g, etc.) per liter of domestic sewage containing flocculent activated sludge;

[0104] Specifically, the dosage of microcarriers has a significant effect on the formation of microcarrier-enriched granular sludge. The appropriate amount of microcarriers can promote sludge granulation and improve the sedimentation performance and biodegradation efficiency of sludge. Too little dosage cannot provide sufficient attachment surface, resulting in a slow sludge granulation process. Excessive dosage may lead to excessive accumulation of extracellular polymers in the sludge, change the surface characteristics of microbial cells, and affect the hydrophobicity and sedimentation performance of the sludge. In addition, the addition of too many microcarriers may also increase the material cost of the system and the difficulty of subsequent treatment. Therefore, determining the appropriate amount of microcarriers is crucial to promoting sludge granulation and improving sewage treatment efficiency.

[0105] The microcarrier includes one or more of activated carbon, struvite, ceramsite, and zeolite;

[0106] The particle size of the microcarrier is 200-400 μm (eg, 250 μm, 300 μm, 350 μm, etc.).

[0107] Specifically, microcarriers with a particle size of 200 to 400 μm and activated sludge are inoculated into a bioreactor (such as a sequencing batch bioreactor and a continuous flow bioreactor). The microcarriers provide a suitable physical surface for the enrichment of flocculent sludge, allowing the flocculent sludge to adhere and aggregate. The appropriate pore size of the microcarriers can also maintain a certain biomass, and enhance the adhesion and stability between flocculent sludge by secreting extracellular polymers (EPS).

[0108] The present invention limits the particle size of the microcarrier to 200-400 μm because the microcarrier with a particle size of 200-400 μm has a moderate surface area to volume ratio, which not only ensures sufficient surface area for the attachment and growth of activated sludge, but also ensures the effective enrichment of sludge particles; if the particle size of the microcarrier is too small, although it can theoretically provide a larger specific surface area, in fact, due to the excessive dispersion of the surface area, the amount of sludge attached per unit area is reduced, resulting in an actual decrease in the effective specific surface area, thereby affecting the enrichment effect of the activated sludge.

[0109] Furthermore, when microcarriers with a particle size of 200 to 400 μm are sorted through a hydrocyclone, they can smoothly rotate with the fluid and separate along a predetermined path without causing blockage at the bottom flow outlet due to excessive volume. The working principle of the hydrocyclone relies on the fluid dynamics effect. Microcarriers with a particle size that is too large may not be discharged smoothly in a high-speed rotating fluid, thereby interfering with the normal sorting process and even causing damage to the equipment.

[0110] As an optional embodiment of the present invention, in step (2), the concentration of flocculent activated sludge in the domestic sewage containing flocculent activated sludge is 4000-5000 mg / L (such as 4200 mg / L, 4400 mg / L, 4600 mg / L, 4800 mg / L, etc.).

[0111] As an optional embodiment of the present invention, in step (2), the amount of domestic sewage containing flocculent activated sludge added is 40-60% (such as 45%, 50%, 55%, etc.) of the volume of the bioreactor.

[0112] As an optional embodiment of the present invention, in step (3), the culture mode is anaerobic-aerobic-anoxic culture (AOA);

[0113] The anaerobic, aerobic and anoxic conditions are used as one culture cycle, and two culture cycles are continuously carried out in the bioreactor every day. Before the start of each culture cycle except the first culture cycle, domestic sewage with a floc activated sludge concentration of 4000-5000 mg / L (such as 4200 mg / L, 4400 mg / L, 4600 mg / L, 4800 mg / L, etc.) is added to the bioreactor; the amount of domestic sewage added is 40-60% (such as 45%, 50%, 55%, etc.) of the volume of the bioreactor; after each culture cycle, the bioreactor is left to stand for 20-30 minutes, and then the supernatant is discharged;

[0114] In each cultivation cycle,

[0115] When the COD concentration of domestic sewage in the bioreactor is 60-80 mg / L (such as 65 mg / L, 70 mg / L, 75 mg / L, etc.), the anaerobic stage ends;

[0116] When the dissolved oxygen concentration of domestic sewage in the bioreactor is ≥1.0 mg / L (such as 1.5 mg / L, 1.7 mg / L, 1.8 mg / L, 1.9 mg / L, etc.), the aerobic stage ends;

[0117] After the domestic sewage in the bioreactor is stirred anoxically for 240 to 270 minutes (e.g., 245 minutes, 250 minutes, 255 minutes, 260 minutes, 265 minutes, etc.), the stirrer is turned off and the anoxic stage ends;

[0118] And / or, in step (3), the culturing time is 9-12 days, preferably 10 days, and the temperature is 24-28°C.

[0119] Specifically, it operates in the anaerobic, aerobic, and anoxic (AOA) mode. Under the action of endogenous denitrifying bacteria, the COD in the domestic sewage is converted into an internal carbon source in the anaerobic section. When the COD concentration is 60-80 mg / L, the internal carbon source storage is considered complete. After the internal carbon source storage is completed, the air pump is turned on to put the floc activated sludge in an aerobic environment. The dissolved oxygen DO concentration in the bioreactor is flexibly adjusted by the gas flow meter to maintain the dissolved oxygen DO concentration at 0.5-1.0 mg / L. The dissolved oxygen DO concentration in the bioreactor is monitored in real time by the pH / DO online meter, and part of the ammonium nitrogen NH4 + -N is oxidized to nitrite nitrogen NO2 by the action of ammonia oxidizing bacteria AOB - -N, when the pH / DO online meter shows that the dissolved oxygen DO concentration reaches or exceeds 1.0 mg / L, turn off the air pump to avoid nitrite nitrogen NO2 - -N is oxidized to nitrate nitrogen NO3 - -N, then the system enters anoxic environment, activated sludge is in NH4+ -N and NO2 - In the state of coexistence of -N, nutritional conditions are provided for the enrichment of anaerobic ammonia-oxidizing bacteria. After 240 to 270 minutes of anoxic stirring, the stirrer is turned off and the reaction stops.

[0120] As an optional embodiment of the present invention, the first screening and the second screening steps are the same, both comprising:

[0121] Feeding the mud-water mixture containing microcarrier-enriched granular sludge or the first overflow sludge into the hydrocyclone for spiral motion;

[0122] The sludge with larger particle size falls to the cone section under the action of inertial centrifugal force, and is discharged into the underflow sludge box through the underflow outlet to become the first underflow sludge or the second underflow sludge;

[0123] The floc sludge with smaller particle size is discharged into the overflow sludge box from the overflow outlet through the rising inner vortex flow, and becomes the first overflow sludge or the second overflow sludge.

[0124] As an optional implementation manner of the present invention, the second overflow sludge is used as excess sludge.

[0125] As an optional embodiment of the present invention, the inlet pressure of the hydrocyclone is 0.10-0.15 MPa, the bottom flow port diameter is 12-14 mm, and the split ratio is 20%-25% (such as 21%, 22%, 23%, 24%, etc.).

[0126] As an optional embodiment of the present invention, in step S2, the mud-water mixture containing microcarrier-enriched granular sludge obtained in the partial step S1 accounts for 40-60% (e.g., 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, etc.) of the volume of the total mud-water mixture in the bioreactor.

[0127] Specifically, if the volume proportion of the mud-water mixture containing microcarrier-enriched granular sludge fed into the hydrocyclone is less than 40%, the loss of microcarriers in the mud-water mixture will be relatively serious; on the contrary, if it is greater than 60%, the total amount of mud-water mixture involved in the screening will increase, resulting in a decrease in the proportion of sludge loaded with microcarriers, affecting the sludge enrichment effect.

[0128] As an optional embodiment of the present invention, in step S5, the portion of the mud-water mixture obtained in step S4 fed into the hydrocyclone accounts for 40-60% (e.g., 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, etc.) of the volume of the total mud-water mixture in the bioreactor.

[0129] As an optional implementation of the present invention, in step S5, the first screening of step S2, the second screening of step S3 and step S4 are repeated at least once every day.

[0130] As an optional embodiment of the present invention, the culture mode in step S4 is anaerobic-aerobic-anoxic culture, with anaerobic, aerobic and anoxic as one culture cycle, the culture time in step S4 is 1 day, and two culture cycles are completed within 1 day;

[0131] Before each culture cycle, domestic sewage with a flocculent activated sludge concentration of 4000-5000 mg / L (such as 4200 mg / L, 4400 mg / L, 4600 mg / L, 4800 mg / L, etc.) is added to the bioreactor; the amount of domestic sewage added is 40-60% (such as 45%, 50%, 55%, etc.) of the volume of the bioreactor; after each culture cycle, the bioreactor is left to stand for 20-30 minutes, and then the supernatant is discharged;

[0132] In each cultivation cycle,

[0133] When the COD concentration of domestic sewage in the bioreactor is 60-80 mg / L (such as 65 mg / L, 70 mg / L, 75 mg / L, etc.), the anaerobic stage ends;

[0134] When the dissolved oxygen concentration of domestic sewage in the bioreactor is ≥1.0 mg / L (such as 1.5 mg / L, 1.7 mg / L, 1.8 mg / L, 1.9 mg / L, etc.), the aerobic stage ends;

[0135] After the domestic sewage in the bioreactor is anaerobically stirred for 240 to 270 minutes (e.g., 245 minutes, 250 minutes, 255 minutes, 260 minutes, 265 minutes, etc.), the agitator is turned off and the anoxic stage ends.

[0136] In the domestic sewage with a flocculent activated sludge concentration of 4000-5000 mg / L used in the present invention, NH4 + -N concentration is 50~100mg / L, NO2 - -N and NO3 - -N concentrations were all below 1 mg / L, and COD concentrations were between 160 and 250 mg / L.

[0137] According to a second aspect of the present invention, Figure 2 As shown, a device for enhancing sludge granulation is provided, the device is a hydrocyclone 2, including a feed inlet 21, an overflow outlet 22, an underflow outlet 23, a cyclone chamber 24, a cone section 25, an underflow sludge box 26 and an overflow sludge box 27;

[0138] The feed port 21 is connected to the cyclone chamber 24;

[0139] The top of the cyclone chamber 24 is connected to the overflow outlet 22, and an overflow sludge box 27 is provided below the overflow outlet 22;

[0140] The cyclone chamber 24 is connected to a cone section 25 below, and an underflow sludge box 26 is provided below the underflow outlet 23 of the cone section 25 .

[0141] Specifically, the cultured microcarrier-enriched granular sludge enters the hydrocyclone 2 through the feed port 21 for the first screening, and the mud-water mixture performs spiral motion in the cyclone chamber 24 of the hydrocyclone 2, wherein the sludge with larger particle size is reduced to the cone section 25 by the inertial centrifugal force, and finally discharged into the underflow sludge box 26 through the underflow outlet 23 to become the first underflow sludge, and the flocculent sludge with smaller particle size is discharged into the overflow sludge box 27 from the overflow outlet 22 through the rising inner cyclone to become the first overflow sludge; in order to further strengthen the sludge, the first overflow sludge of the overflow sludge box 27 enters the cyclone chamber 24 of the hydrocyclone 2 again through the feed port 21 for the second screening, and the second screening steps and principles are the same as the first screening, the underflow sludge of the underflow sludge box 26 is discharged into the bioreactor for further culture, and the second overflow sludge of the overflow sludge box 27 is the residual sludge.

[0142] As an optional embodiment of the present invention, a peristaltic pump 28 is further included to discharge the overflow sludge in the overflow sludge box 27 into the feed port 21 .

[0143] The present invention will be further described in detail below with reference to specific embodiments and comparative examples.

[0144] The activated sludge in the embodiment of the present invention is taken from a reclaimed water plant in Beijing, and the domestic sewage in the reclaimed water plant is used as the nutrient matrix source. The concentrations of various pollutants in the domestic sewage of the reclaimed water plant are: NH4 + -N concentration is 50~70mg / L, NO2 - -N and NO3 - -N concentrations were all below 1 mg / L, and COD concentrations were between 160 and 250 mg / L.

[0145] Example 1

[0146] (1) Cleaning and disinfecting activated carbon with an average particle size of 300 μm;

[0147] (2) 1 g / L to 3 g / L of activated carbon was added to domestic sewage (volume 5 L) with a flocculent activated sludge concentration of 4000 to 5000 mg / L, and the activated carbon was inoculated into a bioreactor (volume 10 L) together with the flocculent activated sludge. Anaerobic, aerobic and anoxic conditions were used as one culture cycle. Two culture cycles were carried out in the bioreactor every day for a total of 10 days.

[0148] Before each culture cycle except the first one, domestic sewage with a flocculent activated sludge concentration of 4000-5000 mg / L was added to the bioreactor; the amount of domestic sewage added was 50% of the volume of the bioreactor; after each culture cycle, the bioreactor was left to stand for 20 minutes, and then the supernatant was discharged;

[0149] During each cultivation cycle:

[0150] Anaerobic stage: When the COD concentration in domestic sewage is 60-80 mg / L, it means that the internal carbon source storage is completed, that is, the anaerobic stage is over, and the air pump is turned on;

[0151] Aerobic section: The DO concentration in the bioreactor is flexibly adjusted through the gas flow meter to maintain the DO concentration in the range of 0.5-1.0 mg / L. The DO concentration in the bioreactor is monitored in real time through the pH / DO online meter. When the DO concentration reaches or exceeds 1.0 mg / L, the gas pump is turned off;

[0152] Anoxic stage: After 240-270 min of anoxic stirring, the agitator is turned off to obtain a mud-water mixture containing activated carbon-enriched granular sludge for the next screening step;

[0153] (3) After the 10-day culture is completed and the supernatant is discharged, 50% of the mud-water mixture containing activated carbon-enriched granular sludge in the bioreactor is immediately discharged and enters the hydrocyclone through the feed port for the first screening; the remaining 50% of the uniform mud-water mixture is left in the bioreactor as idle sludge;

[0154] The inlet pressure of the hydrocyclone is 0.10-0.15 MPa, the bottom flow port diameter is 12-14 mm, and the split ratio is 20%-25%;

[0155] The mud-water mixture makes spiral motion in the cyclone chamber of the hydrocyclone. The sludge with larger particle size falls to the cone section under the action of inertial centrifugal force, and finally is discharged into the underflow sludge box through the underflow outlet to become the first underflow sludge. The flocculent sludge with smaller particle size is discharged into the overflow sludge box from the overflow outlet through the rising inner cyclone to become the first overflow sludge.

[0156] Wherein, the volume ratio of the first underflow sludge to the first overflow sludge is 1:4 to 1:3;

[0157] In order to further strengthen the sludge, the first overflow sludge from the overflow sludge tank is fed into the hydrocyclone chamber through the feed port for a second screening. The second screening steps and principles are the same as the first screening. The underflow sludge obtained from the two screenings in the underflow sludge tank is discharged into the bioreactor for further cultivation, and the second overflow sludge from the overflow sludge tank is the remaining sludge.

[0158] The volume ratio of the sum of the first underflow sludge and the second underflow sludge to the second overflow sludge is 9:16 to 7:9;

[0159] The inlet pressure of the hydrocyclone is 0.10-0.15 MPa, the bottom flow port diameter is 12-14 mm, and the split ratio is 20%-25%;

[0160] (4) The underflow sludge obtained by two screenings of the hydrocyclone is returned to the bioreactor and mixed with the remaining 50% of the mud-water mixture in the bioreactor, and then domestic sewage with a flocculent activated sludge concentration of 4000-5000 mg / L is added, and the amount of domestic sewage added is 50% of the volume of the remaining 50% of the mud-water mixture. After completing one culture cycle in the bioreactor, the supernatant is discharged after standing for 20 minutes;

[0161] Then add domestic sewage with a flocculent activated sludge concentration of 4000-5000 mg / L, and the amount of domestic sewage added is 50% of the volume of the bioreactor. After completing one culture cycle in the bioreactor, let it stand for 20 minutes and then discharge the supernatant;

[0162] (5) Repeat the first screening and second screening of step (3) and step (4) on the mud-water mixture obtained in step (4) once a day for 10 days.

[0163] In this embodiment, it takes a total of 20 days from obtaining domestic sewage from the reclaimed water plant to obtaining the final target sludge, and the target sludge obtained on the 20th day is used for performance testing.

[0164] The results of continuous tests show that after stable operation, the particle size of activated sludge in the system increases, sludge granulation is achieved, and the relative abundance of anaerobic ammonium oxidizing bacteria increases, realizing the screening and enrichment of anaerobic ammonium oxidizing bacteria.

[0165] Comparative Example 1

[0166] The main difference between this comparative example and Example 1 is that each time the mud-water mixture is fed into the hydrocyclone for screening, only one screening is performed, and the first underflow sludge obtained from the first screening is discharged into the bioreactor for cultivation, and the remaining steps and operations are the same as in Example 1.

[0167] Comparative Example 2

[0168] The main difference between this comparative example and Example 1 is that no microcarriers are added to the domestic sewage in step (2), and the remaining steps and operations are the same as those in Example 1.

[0169] Comparative Example 3

[0170] The main difference between this comparative example and Example 1 is that the volume ratio of the first underflow sludge to the first overflow sludge is 1:5 each time the first screening is performed, and the remaining steps and operations are the same as those in Example 1.

[0171] Comparative Example 4

[0172] The main difference between this comparative example and Example 1 is that the volume ratio of the sum of the second underflow sludge and the first underflow sludge to the second overflow sludge is 10:8 each time the hydrocyclone screening is performed, and the remaining steps and operations are the same as those in Example 1.

[0173] Comparative Example 5

[0174] The main difference between this comparative example and Example 1 is that the activated carbon particle size selected in step (1) is 100 μm, and the remaining steps and operations are the same as Example 1.

[0175] Performance Testing

[0176] The median particle size of sludge was measured by laser particle size analyzer. The relative abundance of anaerobic ammonia oxidizing bacteria was analyzed by high-throughput sequencing of bacterial 16S rRNA gene using Illumina MiSeq PE300. The V3-V4 region of 16S rRNA gene was amplified using forward primer 338F (5′-ACTCCTACGGGAGGCAGCA-3′) and reverse primer 806R (5′-GGACTACHVGGGTWTCTAAT-3′).

[0177] Performance data

[0178] Table 1 Sludge particle size and relative abundance of anaerobic ammonia-oxidizing bacteria before and after acclimation in Example 1

[0179]

[0180] Among them, the sludge before domestication refers to the sludge in domestic sewage obtained from the reclaimed water plant; the sludge after domestication refers to the target sludge obtained on the 20th day from the start of sludge extraction from the sewage plant; the particle size of the domesticated sludge of the present invention is in the range of 150 μm-1 mm, and the last statistical number in Table 1 of the present invention is the median particle size of the domesticated sludge.

[0181] like Figure 3-4 As shown in Table 1, the median particle size of the sludge after domestication and the relative abundance of anaerobic ammonia-oxidizing bacteria in Example 1 are significantly increased, and the median particle size of the sludge after domestication can reach 309 μm, with high stability. The increase in the median particle size of the sludge and the relative abundance of anaerobic ammonia-oxidizing bacteria indicates that the sludge granulation and the enrichment of anaerobic ammonia-oxidizing bacteria are achieved under the synergistic effect of the microcarrier and the hydrocyclone, thereby improving the treatment efficiency of sewage.

[0182] As shown in Table 1, compared with Example 1, Comparative Example 1 only performed one screening, and the first overflow sludge obtained from the first screening was discharged into the bioreactor for cultivation, resulting in the loss of microcarriers, which further affected the median particle size of the activated sludge after domestication.

[0183] As shown in Table 1, compared with Example 1, in Comparative Example 2, no microcarriers were added to the activated sludge, and the cultured activated sludge was directly fed into the feed port of the hydrocyclone, resulting in decreased stability and sedimentation performance of the sludge, which in turn affected the median particle size of the activated sludge after domestication.

[0184] As shown in Table 1, compared with Example 1, in Comparative Example 3, the volume ratio of the first underflow sludge to the first overflow sludge is 1:5. At this time, the target granular sludge is easily lost from the first overflow sludge, resulting in a decrease in the enrichment efficiency of the target granular sludge in the first underflow sludge, thereby affecting the median particle size of the activated sludge after domestication.

[0185] As shown in Table 1, compared with Example 1, in Comparative Example 4, the volume ratio of the sum of the second underflow sludge and the first underflow sludge to the second overflow sludge is 10:8, which makes the activated sludge content in the second underflow sludge too high, resulting in a decrease in the separation efficiency of the microcarrier-enriched granular sludge in the second underflow sludge, thereby affecting the median particle size of the activated sludge after acclimation, which is not conducive to the sorting of the target sludge.

[0186] As shown in Table 1, compared with Example 1, the activated carbon particle size selected in step (1) of Comparative Example 5 is 100 μm. Since the particle size of the microcarrier is too small, the amount of sludge adhesion per unit area is reduced, resulting in a decrease in the effective specific surface area of ​​a single particle, which in turn affects the median particle size of the activated sludge after domestication.

[0187] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for enhancing sludge granulation, characterized in that: The steps include: S1: Cultivating a sludge-water mixture containing microcarrier-enriched granular sludge in a bioreactor; S2: feeding the sludge-water mixture containing the microcarrier-enriched granular sludge obtained in step S1 into a hydrocyclone to perform a first screening of the granular sludge to obtain a first underflow sludge and a first overflow sludge; Wherein, the volume ratio of the first underflow sludge to the first overflow sludge is 1:4 to 1:3; S3: feeding the first overflow sludge into the hydrocyclone again to screen the granular sludge for the second time to obtain second underflow sludge and second overflow sludge; Wherein, the volume ratio of the sum of the second underflow sludge and the first underflow sludge to the second overflow sludge is 9:16 to 7:9; S4: discharging the first underflow sludge and the second underflow sludge into the bioreactor and mixing them with the remaining mud-water mixture containing the microcarrier-enriched granular sludge in the bioreactor and continuing to culture; S5: feeding part of the mud-water mixture obtained in step S4 into the hydrocyclone, repeating the first screening of step S2, the second screening of step S3 and step S4 until the enhanced sludge granulation is completed; each time step S4 is repeated, the mud-water mixture containing microcarrier-enriched granular sludge remaining in the bioreactor is replaced by the remaining mud-water mixture obtained in step S4 except for the mud-water mixture entering the hydrocyclone when step S4 was performed last time.

2. A method for enhancing sludge granulation according to claim 1, characterized in that: The calculation formula for the sum of the volumes of the first underflow sludge and the second underflow sludge and the volume of the second overflow sludge is include: V 底 =V 进 ×k1×(1+k2) Formula (1) V 溢 =V 进 ×k2 2 Formula (2) V 进 = V 底 + V 溢 Equation (3) Among them, k1 = 1 / 5 ~ 1 / 4, k2 = 3 / 4 ~ 4 / 5; V 进 is the volume of the mud-water mixture containing microcarrier-enriched granular sludge entering the hydrocyclone; V 底 It is the sum of the volumes of the first underflow sludge and the second underflow sludge flowing out of the underflow outlet of the hydrocyclone; V 溢 It is the volume of the second overflow sludge flowing out from the overflow port of the hydrocyclone.

3. The method for enhancing sludge granulation according to claim 1, characterized in that: The method for preparing the sludge-water mixture containing microcarrier-enriched granular sludge comprises the following steps: (1) pretreating the microcarrier; (2) adding the pretreated microcarriers to domestic sewage containing flocculent activated sludge, mixing them evenly, and obtaining mixed domestic sewage; (3) placing the mixed domestic sewage in step (2) in a bioreactor for culturing to obtain a sludge-water mixture containing microcarrier-enriched granular sludge.

4. A method for enhancing sludge granulation according to claim 3, characterized in that: In step (1), the pretreatment includes cleaning and disinfection; And / or, in step (2), the dosage of the microcarrier is 1 g to 3 g per liter of domestic sewage containing flocculent activated sludge; And / or, the microcarrier comprises one or more of activated carbon, struvite, ceramsite, and zeolite; And / or, the particle size of the microcarrier is 200 to 400 μm; And / or, in step (2), the concentration of the flocculent activated sludge in the domestic sewage containing flocculent activated sludge is 4000-5000 mg / L; And / or, in step (2), the amount of domestic sewage containing flocculent activated sludge added is 40-60% of the volume of the bioreactor.

5. The method for enhancing sludge granulation according to claim 3, characterized in that: In step (3), the culture mode is anaerobic-aerobic-anoxic culture; The anaerobic, aerobic and anoxic conditions are used as one culture cycle, and two culture cycles are continuously carried out in the bioreactor every day. Before the start of each culture cycle except the first culture cycle, domestic sewage with a flocculent activated sludge concentration of 4000-5000 mg / L is added to the bioreactor; the amount of domestic sewage added is 40-60% of the volume of the bioreactor; after each culture cycle, the bioreactor is left to stand for 20-30 minutes, and then the supernatant is discharged; In each cultivation cycle, When the COD concentration of domestic sewage in the bioreactor is 60-80 mg / L, the anaerobic stage ends; When the dissolved oxygen concentration of domestic sewage in the bioreactor is ≥1.0 mg / L, the aerobic stage ends; After the domestic sewage in the bioreactor is stirred anoxically for 240 to 270 minutes, the stirrer is turned off and the anoxic stage ends; And / or, in step (3), the culturing time is 9-12 days, preferably 10 days, and the temperature is 24-28°C.

6. The method for enhancing sludge granulation according to claim 1, characterized in that: The first screening and the second screening steps are the same, both including: Feeding the mud-water mixture containing microcarrier-enriched granular sludge or the first overflow sludge into the hydrocyclone for spiral motion; The sludge with larger particle size falls to the cone section under the action of inertial centrifugal force, and is discharged into the underflow sludge box through the underflow outlet to become the first underflow sludge or the second underflow sludge; The flocculent sludge with smaller particle size is discharged from the overflow outlet into the overflow sludge box through the rising inner layer vortex flow, and becomes the first overflow sludge or the second overflow sludge; The second overflow sludge is used as excess sludge.

7. The method for enhancing sludge granulation according to claim 1, characterized in that: The inlet pressure of the hydrocyclone is 0.10-0.15 MPa, the bottom flow port diameter is 12-14 mm, and the split ratio is 20%-25%; and / or, in step S2, the part of the sludge-water mixture containing microcarrier-enriched granular sludge obtained in step S1 fed into the hydrocyclone accounts for 40-60% of the volume of the total sludge-water mixture in the bioreactor; and / or, in step S5, the part of the mud-water mixture obtained in step S4 fed into the hydrocyclone accounts for 40-60% of the volume of the total mud-water mixture in the bioreactor; And / or, in step S5, the first screening of step S2, the second screening of step S3 and step S4 are repeated at least once every day.

8. The method for enhancing sludge granulation according to claim 1, characterized in that: The culture mode in step S4 is anaerobic-aerobic-anoxic culture, with anaerobic, aerobic and anoxic as one culture cycle. The culture time in step S4 is 1 day, and two culture cycles are completed within 1 day. Before each culture cycle, domestic sewage with a flocculent activated sludge concentration of 4000-5000 mg / L is added to the bioreactor; the amount of domestic sewage added is 40-60% of the volume of the bioreactor; after each culture cycle, the bioreactor is left to stand for 20-30 minutes, and then the supernatant is discharged; In each cultivation cycle, When the COD concentration of domestic sewage in the bioreactor is 60-80 mg / L, the anaerobic stage ends; When the dissolved oxygen concentration of domestic sewage in the bioreactor is ≥1.0 mg / L, the aerobic stage ends; After the domestic sewage in the bioreactor is anoxically stirred for 240 to 270 minutes, the agitator is turned off and the anoxic stage ends.

9. A device for enhancing sludge granulation used in the method for enhancing sludge granulation as claimed in any one of claims 1 to 8, characterized in that: The device is a hydrocyclone, comprising a feed inlet, an overflow outlet, an underflow outlet, a cyclone chamber, a cone section, an underflow sludge tank and an overflow sludge tank; The feed port is connected to the cyclone chamber; The top of the cyclone chamber is connected to an overflow outlet, and an overflow sludge box is provided below the overflow outlet; The cyclone chamber is connected to a cone section below, and an underflow sludge box is arranged below the underflow outlet of the cone section.

10. The device for enhancing sludge granulation according to claim 9, characterized in that: It also includes a peristaltic pump, which is used to discharge the overflow sludge in the overflow sludge box into the feed inlet.

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