Diatomite integrity detection and recovery rate prediction method for fluidized bed and its application

Abstract

The present invention provides a method for detecting the integrity of diatomaceous earth and predicting the recovery rate in a fluidized bed and its application, including the steps of: uniformly sampling the diatomaceous earth to be tested, configuring the sample into a slurry, and after sieving the slurry, calculating the mass percentage a of the oversize material in the diatomaceous earth; obtaining the average specific surface area x of the diatomaceous earth to be tested; calculating the integrity A of the diatoms based on the following formula: In the formula: S is the reference specific surface area of the diatomaceous earth, with a value of 12 to 15 m<supgt;2< / supgt> / g. The present invention first proposes the predictable trend of the recovery rate of diatomaceous earth when diatomaceous earth is applied to fluidized bed sewage treatment, with remarkable effects and worthy of popularization.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a diatomaceous earth integrity detection and recovery rate prediction method for a fluidized bed and an application thereof. Background Art

[0002] Using diatomaceous earth as a carrier can cleanly remove ammonia nitrogen, total nitrogen, total phosphorus, COD, and heavy metals such as Co, Mn, and Hg in sewage. In addition, its high specific surface area can provide abundant attachment sites for nutrient sources and microorganisms. Diatomaceous earth carriers have broad application prospects in sewage treatment.

[0003] With reference to the invention with announcement number CN110577285B, a novel high-concentration powder carrier biological fluidized bed process for treating urban sewage is proposed, wherein the process comprises a HPB biochemical pool, a high-efficiency clarification pool, a filtration pool and a disinfection pool connected in sequence, wherein the HPB biochemical pool is divided into an anaerobic zone, an anoxic zone, an aerobic zone and a concentration and separation zone along the flow direction of sewage, and composite powder carriers are respectively added to the anaerobic zone, the anoxic zone and the aerobic zone, and stirred and mixed into a mixed liquid; a composite powder carrier cyclone separation and recovery system separates the composite powder carrier, and the separated composite powder carrier is re-added to the HPB biochemical pool for recycling.

[0004] HPB biochemical pool technology adds microbial carriers (including diatomaceous earth) to the biochemical pool to increase the concentration of the mixed liquid in the biochemical pool, while building a microbial system of suspended growth and attached growth "double mud" symbiosis. Among them, the "double mud" symbiosis mainly uses the carrier recovery system to achieve a long mud age for the microorganisms attached to the carrier through continuous circulation, which is conducive to strengthening the biological denitrification of the system; at the same time, according to the needs of phosphorus removal, the suspended growth of activated sludge (short mud age microorganisms) can be discharged to strengthen the biological phosphorus removal of the system and improve the efficiency of nitrogen and phosphorus removal.

[0005] In addition, the carrier recovery system also realizes the reuse of the carrier, saving operating costs.

[0006] However, in the application process of the carrier recovery system, after the diatomite is put into use, it is difficult to predict the recovery rate of different batches of diatomite, which brings challenges to the input quality of diatomite and the determination of the amount of additional input in the process. The commonly used technology also does not explore the recovery rate of diatomite as a carrier put into the biochemical pool and its influencing factors. Summary of the invention

[0007] In order to solve the technical problem that the recovery rate of diatomite after being put into a biochemical pool in the above-mentioned common technology is difficult to predict, the present invention provides a method for detecting the integrity of diatomite used in a fluidized bed, comprising the steps of:

[0008] Uniformly sample the diatomite to be tested and configure the sample into a slurry. After the slurry is sieved, the mass proportion a of the sieve-surface material in the diatomite is calculated;

[0009] Obtaining an average specific surface area x of the diatomaceous earth to be tested;

[0010] The integrity of diatoms A was calculated based on the following formula:

[0011]

[0012] Where: S is the reference specific surface area of ​​diatomite, ranging from 12 to 15 m 2 / g.

[0013] Further, the determination of the reference specific surface area S comprises the steps of:

[0014] Screening a reference diatomaceous earth of the same type as the diatomaceous earth to be tested, which has high integrity and a recovery rate greater than 95% in a cyclone separation recovery system for fluidized bed wastewater treatment;

[0015] The specific surface area of ​​the reference diatomaceous earth is measured as the reference specific surface area S.

[0016] Furthermore, the step of screening a reference diatomaceous earth of the same type as the diatomaceous earth to be tested, which has high integrity and a recovery rate greater than 95% in a cyclone separation recovery system for fluidized bed wastewater treatment, comprises:

[0017] Observe the same type of diatomaceous earth as the diatomaceous earth to be tested under a microscope at a magnification of 100 to 1000 times;

[0018] Diatomaceous earth with a ratio of the amount of intact diatomaceous earth to the amount of all diatomaceous earth within the observation field of view greater than 70% is selected as the reference diatomaceous earth, wherein the equivalent particle size of the intact diatomaceous earth is 10-50 μm.

[0019] Furthermore, the diatom structure in the diatomite to be tested is sieve algae.

[0020] Furthermore, the step of uniformly sampling the diatomite to be tested and configuring the sample into a slurry also includes: the solid-liquid ratio of the slurry is 1:10-1:20.

[0021] Furthermore, the slurry is screened through a mesh size of 200 meshes.

[0022] Furthermore, the value of S is 15m 2 / g.

[0023] The present invention provides a method for predicting the recovery rate of diatomite used in a fluidized bed, comprising the steps of:

[0024] The diatomaceous earth to be tested is prepared into a slurry, and after the slurry passes through a 200-mesh sieve, the mass proportion a of the sieve-surface material in the diatomaceous earth is calculated;

[0025] Obtaining an average specific surface area x of the diatomaceous earth;

[0026] The integrity of diatoms A was calculated based on the following formula:

[0027]

[0028] Where: S is the reference specific surface area of ​​diatomite, ranging from 12 to 15 m 2 / g;

[0029] The predicted recovery rate is determined based on the diatom integrity A:

[0030] When the diatom integrity A is [1.05, 1.10), the predicted recovery rate is [96%, 97%);

[0031] When the diatom integrity A is [1, 1.05), the predicted recovery rate is [95%, 96%);

[0032] When the diatom integrity A is [0.95, 1), the predicted recovery rate is [94%, 95%);

[0033] When the diatom integrity A is [0.90, 0.95), the predicted recovery rate is [92%, 94%);

[0034] When the diatom integrity A is [0.85, 0.90), the predicted recovery rate is [88%, 92%);

[0035] When the diatom integrity A is [0.80, 0.85), the predicted recovery rate is [83%, 88%);

[0036] When the diatom integrity A is [0.75, 0.80), the predicted recovery rate is [77%, 83%);

[0037] When the diatom integrity A is [0.70, 0.75), the predicted recovery rate is [71%, 77%);

[0038] When the diatom integrity A is [0.65, 0.70), the predicted recovery rate is [64%, 71%);

[0039] When the diatom integrity A is [0.60, 0.65), the predicted recovery rate is [57%, 64%);

[0040] When the diatom integrity A is [0.55, 0.60), the predicted recovery rate is [50%, 57%);

[0041] When the diatom integrity A is [0.50, 0.55), the predicted recovery rate is [42%, 50%).

[0042] The present invention provides an application of the method for detecting the integrity of diatomite for a fluidized bed as described in any one of the above or the method for predicting the recovery rate of diatomite for a fluidized bed as described in the above in sewage treatment, comprising the steps of:

[0043] Based on the integrity detection method of diatomite for a fluidized bed as described in any one of the above items, a first diatomite with an integrity A greater than 1 is screened out;

[0044] The sewage enters the biochemical pool, which is divided into an anaerobic zone, an anoxic zone, an aerobic zone and a concentration and separation zone in sequence along the flow direction of the sewage, and the first diatomaceous earth is added to the anaerobic zone, the anoxic zone and the aerobic zone respectively, and stirred and mixed to form a mixed liquid;

[0045] The mixed liquid flowing into the concentration and separation zone is concentrated and separated to obtain a concentrated liquid, and the concentrated liquid is returned to the anaerobic zone; after the supernatant in the concentration and separation zone is discharged, it passes through a high-efficiency clarification tank, a filtration tank and a disinfection tank in sequence to achieve water purification, and the separated residual sludge is transported to a cyclone separation recovery system, and the cyclone separation recovery system cyclones out sludge particles, and the sludge particles include a second diatomaceous earth and activated sludge attached to the surface of the second diatomaceous earth;

[0046] The sludge particles are collected, and the recovery rate of the first diatomaceous earth is predicted according to the diatomaceous earth recovery rate prediction method for a fluidized bed as described above, and the addition amount of the third diatomaceous earth is calculated. The sludge particles are mixed with the third diatomaceous earth and then put into the anaerobic zone, the anoxic zone, and the aerobic zone to continue to participate in sewage treatment.

[0047] Furthermore, the added amount of the third diatomaceous earth is (1-the predicted recovery rate) times the total mass of the first diatomaceous earth.

[0048] Compared with the prior art, the present invention has at least the following advantages:

[0049] Based on the technical problem that the recovery rate of diatomite is difficult to predict after diatomite is put into the biochemical pool and sorted by the cyclone separation system, the applicant has found that the technical problem is mainly related to the integrity of diatoms in diatomite. To this end, the present invention provides a method for detecting the integrity of diatoms in diatomite. Based on this detection method, the integrity of diatomite relative to intact diatoms can be detected. The higher the integrity of diatomite, that is, the larger the A value, the higher the recovery rate of diatomite. The present invention proposes for the first time the predictable trend of diatomite recovery rate when diatomite is used in fluidized bed sewage treatment.

[0050] Based on the discovery of the foreseeable trend in the present invention, during the process operation, the recovery rate can be predicted and the additional dosage can be controlled according to the difference in the integrity of the diatomite. For example, after the first batch of diatomite is put into use, the additional dosage is adjusted according to the recovery rate; if the integrity of the diatomite in the second batch is slightly higher than that of the first batch, then the additional dosage of the second batch can be appropriately reduced according to the additional dosage of the first batch. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0052] Figure 1 This is a light microscope image of sample No. 1 in Example 1 of the present invention magnified 160 times; Figure 2 This is a light microscope image of sample No. 1 in Example 1 of the present invention magnified 640 times.

[0053] Figure 3 This is a light microscope image of sample No. 2 in Example 1 of the present invention magnified 160 times; Figure 4 This is a light microscope image of sample No. 2 in Example 1 of the present invention magnified 640 times.

[0054] Figure 5 This is an electron microscope image of sample No. 3 in Example 1 of the present invention magnified 500 times; Figure 6 This is an electron microscope image of sample No. 3 in Example 1 of the present invention magnified to 1000 times.

[0055] Figure 7 This is an electron microscope image of sample No. 4 in Example 1 of the present invention magnified 200 times. Figure 8 This is an electron microscope image of sample No. 4 in Example 1 of the present invention magnified 500 times; Fig. 9 This is an electron microscope image of sample No. 4 in Example 1 of the present invention magnified to 1000 times.

[0056] Fig.10 This is an electron microscope image of sample No. 5 in Example 1 of the present invention magnified 500 times. Fig.11 This is an electron microscope image of sample No. 5 in Example 1 of the present invention magnified 1000 times. Fig.12 This is an electron microscope image of sample No. 5 in Example 1 of the present invention magnified 2000 times.

[0057] Fig.13 This is an electron microscope image of sample No. 6 in Example 1 of the present invention magnified 200 times. Fig.14 This is an electron microscope image of sample No. 6 in Example 1 of the present invention magnified 500 times, Fig.15 This is an electron microscope image of sample No. 6 in Example 1 of the present invention magnified to 1000 times.

[0058] Fig.16 This is an electron microscope image of sample No. 7 in Example 1 of the present invention magnified 200 times. Fig.17 This is an electron microscope image of sample No. 7 in Example 1 of the present invention magnified 500 times. Fig.18 This is an electron microscope image of sample No. 7 in Example 1 of the present invention magnified 1000 times.

[0059] Fig.19 This is a light microscope image of the medium-sized sample of Example 8 of the present invention magnified 160 times. Fig. 20 This is a light microscope image of sample No. 8 in Example 1 of the present invention magnified 640 times; Fig.21 This is an electron microscope image of sample No. 8 in Example 1 of the present invention magnified 200 times. Fig. 22 This is an electron microscope image of sample No. 8 in Example 1 of the present invention magnified 500 times.

[0060] Fig.23 This is a light microscope image of sample No. 8 in Example 1 of the present invention magnified 160 times. Fig.24 This is a light microscope image of sample No. 9 in Example 1 of the present invention magnified 640 times; Fig.25 This is an electron microscope image of sample No. 9 in Example 1 of the present invention magnified 200 times; Fig.26 This is an electron microscope image of sample No. 9 in Example 1 of the present invention magnified 500 times. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0062] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0063] When numerical ranges are given in the embodiments, it should be understood that, unless otherwise specified in the present invention, both endpoints of each numerical range and any value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention are familiar to those skilled in the art and the description of the present invention, and any methods, equipment and materials of the prior art similar or equivalent to the methods, equipment and materials described in the embodiments of the present invention can also be used to implement the present invention.

[0064] Based on the above, when diatomaceous earth is used as a carrier in HPB biochemical pool technology, in order to build a dual sludge age system, the diatomaceous earth after single-pass treatment is usually separated and recovered by a cyclone separation system, and the sludge particles with density and particle size that meet the requirements are screened out and continued to be put into the biochemical pool, and used together with the newly added short sludge age diatomaceous earth for sewage treatment.

[0065] However, in this process, the recovery rate of diatomite is difficult to predict, which also means that the amount of diatomite to be added is difficult to estimate. In order to ensure the quality and efficiency of sewage treatment, the recovery rate can only be calculated continuously, and the amount of additional addition can be adjusted according to the size of the recovery rate. Based on this, the applicant tried to explore the factors affecting the recovery rate of diatomite, and predicted the amount of additional addition based on the trend of the influence of the factors affecting diatomite on the recovery rate.

[0066] Since the particle size of intact diatoms is usually between 10 and 50 microns, the applicant uses the volume percentage of diatomaceous earth in this particle size range to assess the integrity of diatoms, and after setting the parameters, the following formula is fitted:

[0067] B=(1-a)zy

[0068] Where: B is the absolute integrity of the diatom, ranging from 0 to 1;

[0069] a is the mass percentage of the sieve material in the diatomite after the slurry passes through a 200-mesh sieve;

[0070] z is the volume percentage of particles with a diameter of 10 to 50 μm in diatomite;

[0071] y is the silicon dioxide content in diatomaceous earth.

[0072] However, after experiments, the applicant found that the recovery rate of diatomite in the fluidized bed has no direct relationship with the solid particle size distribution in the diatomite, and has no predictive significance for the recovery of diatomite in the fluidized bed.

[0073] Further exploration, the present invention provides a method for detecting the integrity of diatomaceous earth used in a fluidized bed.

[0074] The diatom integrity refers to the overall integrity of the diatomite relative to the complete diatoms with a specific surface area of ​​S.

[0075] Includes steps:

[0076] S1. uniformly sample the diatomite to be tested and prepare the sample into a slurry. After the slurry passes through a 200-mesh sieve, calculate the mass proportion a of the sieve-surface material in the diatomite.

[0077] The forms of diatomaceous earth mainly include sieve algae, straight chain algae, disc algae, etc.

[0078] In some embodiments, the diatoms in the diatomaceous earth to be tested are sieve diatoms. Among them, due to the large equivalent particle size and good integrity of sieve diatoms, sieve diatoms are easier to recover than other forms and are often used in fluidized bed wastewater treatment.

[0079] Diatomaceous earth, as the biological remains of algae, has silicon dioxide as its main component. It has a large specific surface area, high porosity, and good hydrophilicity. It can be used as a microbial carrier for the attachment and growth of microorganisms in sewage treatment.

[0080] Therefore, Sievella has more important application value in sewage treatment.

[0081] The determination of the microstructure in the present invention includes the following steps: taking 1g of the diatomite sample to be tested and preparing it into a slurry with a solid content of 1.0%, taking a drop of the slurry on a glass slide with a rubber-tipped dropper while stirring, and then covering it with a cover glass and observing it under an optical microscope. First, magnify it to 160 times, observe the overall situation of the sample, take 3 photos of a representative area, and then magnify it to 640 times and take photos. The optical microscope uses 10 (object) × 16 (mesh) and 40 (object) × 16 (mesh).

[0082] When preparing samples for electron microscopy, take a small amount of sample onto the conductive glue, spread it evenly, first magnify it to 200 times, observe the overall situation of the sample, take photos of representative areas, and then magnify it to 500 times and take 3 photos. When the carrier sample to be tested is observed under an optical microscope and an electron microscope, it is mainly a complete diatom shell with geometric figures and pore structures, and there may be a small amount of diatom shell fragments. The magnification of the electric microscope is 200 times and 500 times.

[0083] In some embodiments, the diatomaceous earth is configured as a slurry further comprising: the solid-liquid ratio of the slurry is 1:10-1:20.

[0084] In some embodiments, the mesh number of the slurry screening can also be 200 meshes. The slurry screening process can screen out impurity particles with larger particle sizes, including various weeds, mineral debris, sand and gravel, etc.

[0085] For example, 50-100 g of the diatomaceous earth to be tested can be sampled and prepared into a slurry with a solid content of 5%-10%. After being stirred evenly, it is sieved with a 200-mesh standard sieve, and rinsed with water while sieving until the liquid under the sieve is clear. The material on the sieve is collected, dried, and weighed to calculate the mass percentage of the material on the sieve.

[0086] As another example, a laser particle size analyzer can also be used to determine the proportion of particles with a diameter of 10-50 μm in the sample: 10 g of the diatomaceous earth to be tested is sampled and prepared into a slurry with a solid content of 5%. After stirring evenly, about 5 ml is taken and measured using a laser particle size analyzer.

[0087] In some embodiments, in order to achieve uniform sampling, the quartering method or the nine-square grid method may be used; based on the uniformity of sampling, the integrity A measured for the sample is the integrity A of the diatomaceous earth to be tested.

[0088] S2. Obtaining the average specific surface area x of the diatomaceous earth;

[0089] S3. Calculate the integrity A of diatoms based on the following formula:

[0090]

[0091] Where: S is the reference specific surface area of ​​diatomite, ranging from 12 to 15 m 2 / g (actually measured value of specific surface area of ​​diatomaceous earth with actual recovery rate greater than 95%).

[0092] In some embodiments, the determination of the reference specific surface area S comprises the steps of:

[0093] S31. Screening a reference diatomaceous earth of the same type as the diatomaceous earth to be tested, which has a high integrity and a recovery rate greater than 95% in a cyclone separation recovery system for fluidized bed wastewater treatment.

[0094] In some embodiments, the step of screening a reference diatomaceous earth of the same type as the diatomaceous earth to be tested, which has high integrity and a recovery rate greater than 95% in a cyclone separation recovery system for fluidized bed wastewater treatment, comprises:

[0095] S311. Observe the diatomaceous earth of the same type as the diatomaceous earth to be tested under a microscope at a magnification of 100 to 1000 times;

[0096] S312. Screen out diatomaceous earth with a ratio of the amount of intact diatomaceous earth to the amount of all diatomaceous earth within the observation field of view greater than 70% as the reference diatomaceous earth.

[0097] The sewage enters the biochemical pool, which is divided into an anaerobic zone, an anoxic zone, an aerobic zone and a concentration and separation zone in sequence along the flow direction of the sewage, and reference diatomaceous earth is added to the anaerobic zone, the anoxic zone and the aerobic zone respectively, and stirred to mix into a mixed liquid;

[0098] The mixed liquid flowing into the concentration and separation zone is concentrated and separated to obtain a concentrated liquid, and the concentrated liquid is returned to the anaerobic zone; after the supernatant in the concentration and separation zone is discharged, it passes through a high-efficiency clarification tank, a filtration tank and a disinfection tank in sequence to achieve water purification, and the separated residual sludge is transported to a cyclone separation and recovery system, and the cyclone separation and recovery system cyclones out sludge particles, and the sludge particles include a fourth diatomaceous earth and activated sludge attached to the surface of the fourth diatomaceous earth; the fourth diatomaceous earth accounts for 95% of the input mass of the reference diatomaceous earth.

[0099] The quality determination of the fourth diatomaceous earth includes the steps of: by measuring the content of diatoms (amorphous silicon dioxide) in the sludge particles, the mass ratio of the diatoms in the fourth diatomaceous earth to the mass ratio of the diatoms in the reference diatomaceous earth is 95%.

[0100] S32. Determine the specific surface area of ​​the reference diatomaceous earth as the reference specific surface area S.

[0101] The method for determining the specific surface area of ​​reference diatomaceous earth may include the following steps:

[0102] Sample preparation: Grind the reference diatomaceous earth sample to a certain particle size and dry it.

[0103] Sample loading: Load the ground reference diatomaceous earth sample into the sample tube of the surface area analyzer, ensuring that the sample is evenly distributed.

[0104] Nitrogen adsorption: nitrogen is introduced to allow the surface of the reference diatomaceous earth sample to adsorb nitrogen.

[0105] Degassing: The nitrogen on the surface of the reference diatomaceous earth sample was removed by vacuum degassing.

[0106] Determination of nitrogen adsorption: Nitrogen was introduced again to measure the amount of nitrogen adsorbed on the surface of the reference diatomaceous earth sample.

[0107] Calculation of specific surface area: Calculate the specific surface area of ​​the reference diatomaceous earth based on the amount of nitrogen adsorption and the mass of the reference diatomaceous earth sample.

[0108] In some embodiments, S is 15 m 2 / g.

[0109] The present invention provides a method for predicting the recovery rate of diatomite used in a fluidized bed, comprising the steps of:

[0110] Uniformly sample the diatomite to be tested and prepare the sample into a slurry. After the slurry passes through a 200-mesh sieve, calculate the mass proportion a of the sieve-surface material in the diatomite.

[0111] Obtaining an average specific surface area x of the diatomaceous earth;

[0112] The integrity of diatoms A was calculated based on the following formula:

[0113]

[0114] Where: S is the reference specific surface area of ​​diatomite, ranging from 12 to 15 m 2 / g;

[0115] The predicted recovery rate is determined based on the diatom integrity A:

[0116] When the diatom integrity A is [1.05, 1.10), the predicted recovery rate is [96%, 97%);

[0117] When the diatom integrity A is [1, 1.05), the predicted recovery rate is [95%, 96%);

[0118] When the diatom integrity A is [0.95, 1), the predicted recovery rate is [94%, 95%);

[0119] When the diatom integrity A is [0.90, 0.95), the predicted recovery rate is [92%, 94%);

[0120] When the diatom integrity A is [0.85, 0.90), the predicted recovery rate is [88%, 92%);

[0121] When the diatom integrity A is [0.80, 0.85), the predicted recovery rate is [83%, 88%);

[0122] When the diatom integrity A is [0.75, 0.80), the predicted recovery rate is [77%, 83%);

[0123] When the diatom integrity A is [0.70, 0.75), the predicted recovery rate is [71%, 77%);

[0124] When the diatom integrity A is [0.65, 0.70), the predicted recovery rate is [64%, 71%);

[0125] When the diatom integrity A is [0.60, 0.65), the predicted recovery rate is [57%, 64%);

[0126] When the diatom integrity A is [0.55, 0.60), the predicted recovery rate is [50%, 57%);

[0127] When the diatom integrity A is [0.50, 0.55), the predicted recovery rate is [42%, 50%).

[0128] The present invention also provides an application of the method for detecting the integrity of diatomite for a fluidized bed as described in any one of the above or the method for predicting the recovery rate of diatomite for a fluidized bed as described in the above in sewage treatment, comprising the steps of:

[0129] Based on the integrity detection method of diatomite for a fluidized bed as described in any one of the above items, a first diatomite with an integrity A greater than 1 is screened out;

[0130] The sewage enters the biochemical pool, which is divided into an anaerobic zone, an anoxic zone, an aerobic zone and a concentration and separation zone in sequence along the flow direction of the sewage, and the first diatomaceous earth is added to the anaerobic zone, the anoxic zone and the aerobic zone respectively, and stirred and mixed to form a mixed liquid;

[0131] The mixed liquid flowing into the concentration and separation zone is concentrated and separated to obtain a concentrated liquid, and the concentrated liquid is returned to the anaerobic zone; after the supernatant in the concentration and separation zone is discharged, it passes through a high-efficiency clarification tank, a filtration tank and a disinfection tank in sequence to achieve water purification, and the separated residual sludge is transported to a cyclone separation recovery system, and the cyclone separation recovery system cyclones out sludge particles, and the sludge particles include a second diatomaceous earth and activated sludge attached to the surface of the second diatomaceous earth;

[0132] The sludge particles are collected, the recovery rate of the first diatomaceous earth is predicted according to the diatomaceous earth recovery rate prediction method for the fluidized bed, and the addition amount of the third diatomaceous earth is calculated, and the sludge particles are mixed with the third diatomaceous earth and put into the anaerobic zone, the anoxic zone, and the aerobic zone to continue to participate in the sewage treatment.

[0133] In some embodiments, the amount of the third diatomaceous earth added is (1-the predicted recovery rate) times the total mass of the first diatomaceous earth.

[0134] In some embodiments, the first diatomaceous earth may be compounded with an alternative carbon source and then put into the biochemical pool;

[0135] In some embodiments, the third diatomaceous earth may be compounded with the alternative carbon source before being put into the biochemical pool.

[0136] In order to facilitate those skilled in the art to further understand the present invention, examples are given below:

[0137] Example 1

[0138] S1. Jilin Tianbao takes the first-grade soil air filter bag product, evenly samples it and names it as sample No. 1, and configures sample No. 1 into slurry. After the slurry passes through a 200-mesh sieve, calculate the mass proportion of the sieve-surface material in sample No. 1 a;

[0139] S2. Obtaining the average specific surface area x of the diatomaceous earth to be tested;

[0140] S3. The integrity A of sample No. 1 is calculated based on the following formula:

[0141]

[0142] Where: S is the reference specific surface area of ​​diatomite, which is 15m 2 / g.

[0143] S4. The absolute integrity B of sample No. 1 is measured according to the following formula:

[0144]

[0145] Where: B is the absolute integrity of the diatom, ranging from 0 to 1;

[0146] a is the mass ratio of the sieve material in the diatomite after the slurry passes through a 200-mesh sieve, %, ≤2;

[0147] x is the volume percentage of particles with a diameter of 10 to 50 μm in diatomite, %, ≥ 60;

[0148] y is the silicon dioxide content in diatomaceous earth, %, ≥75.

[0149] Among them, the light microscope image of sample No. 1 magnified 160 times is as follows Figure 1 As shown, the light microscope image magnified 640 times is as follows Figure 2 shown.

[0150] Take the Jilin Tianbao first-grade soil air separation filter bag and cyclone product, evenly sample and name it sample No. 2, and repeat the above steps S1 to S4 to measure the integrity A and absolute integrity B of sample No. 2.

[0151] Among them, the light microscope image of sample No. 2 magnified 160 times is as follows Figure 3 As shown, the light microscope image magnified 640 times is as follows Figure 4 shown.

[0152] Take the Jilin Demate third-grade soil wind-selected product, evenly sample it and name it Sample No. 3, and repeat the above steps S1 to S4 to measure the integrity A and absolute integrity B of Sample No. 3.

[0153] Among them, the electron microscope image of sample No. 3 magnified 500 times is as follows Figure 5 As shown, the electron microscope image magnified 1000 times is as follows Figure 6 shown.

[0154] A uniform sample of the Jilin Demate grade 3 soil wind-selected product is named sample No. 4, and the above steps S1 to S4 are repeated to measure the integrity A and absolute integrity B of sample No. 3.

[0155] Among them, the electron microscope image of sample No. 4 magnified 200 times is as follows Figure 7 As shown, the electron microscope image magnified 500 times is as follows Figure 8 As shown, the electron microscope image magnified 1000 times is as follows Fig. 9 shown.

[0156] A uniform sample of the Jilin Demate grade 3 soil wind-selected product is named sample No. 5, and the above steps S1 to S4 are repeated to measure the integrity A and absolute integrity B of sample No. 3.

[0157] Among them, the electron microscope image of sample No. 5 magnified 500 times is as follows Fig.10 As shown, the light microscope image magnified 1000 times is as follows Fig.11 As shown, the light microscope image magnified 2000 times is as follows Fig.12 shown.

[0158] A uniform sample of the Jilin Demate grade 3 soil wind-selected product is named sample No. 6, and the above steps S1 to S4 are repeated to measure the integrity A and absolute integrity B of sample No. 3.

[0159] Among them, the electron microscope image of sample No. 6 magnified 200 times is as follows Fig.13 As shown, the electron microscope image magnified 500 times is as follows Fig.14 As shown, the electron microscope image magnified 1000 times is as follows Fig.15 shown.

[0160] A uniform sample of Jilin Demate's third-grade soil wind-selected product is named Sample No. 7, and the above steps S1 to S4 are repeated to measure the integrity A and absolute integrity B of Sample No. 3.

[0161] Among them, the electron microscope image of sample No. 7 magnified 200 times is as follows Fig.16 As shown, the electron microscope image magnified 500 times is as follows Fig.17 As shown, the electron microscope image magnified 1000 times is as follows Fig.18 shown.

[0162] After washing the filter bags and cyclone products of Jilin Tianbao, uniform samples were taken and named as sample No. 8. The above steps S1 to S4 were repeated to measure the integrity A and absolute integrity B of sample No. 3.

[0163] Among them, the light microscope image of sample No. 8 magnified 160 times is as follows Fig.19 As shown, the light microscope image magnified 640 times is as follows Fig. 20 As shown;

[0164] The electron microscope image of sample No. 8 magnified 200 times is as follows Fig.21 As shown, the electron microscope image magnified 500 times is as follows Fig. 22 shown.

[0165] A uniform sample of the Jilin Tianbao first-grade soil wind-selected cyclone product is named Sample No. 9, and the above steps S1 to S4 are repeated to measure the integrity A and absolute integrity B of Sample No. 3.

[0166] Among them, the light microscope image of sample No. 9 magnified 160 times is as follows Fig.23 As shown, the light microscope image magnified 640 times is as follows Fig.24 As shown;

[0167] The electron microscope image of sample No. 9 magnified 200 times is as follows Fig.25 As shown, the electron microscope image magnified 500 times is as follows Fig.26 shown.

[0168] The various indicators and analysis results of the above samples No. 1 to No. 9 are shown in the following table:

[0169] Table 1: Basic index data table of samples 1 to 9

[0170]

[0171] The relative integrity test results, absolute integrity test results and recovery rate analysis results of samples 1 to 9 are shown in the following table:

[0172] Table 2: Relative integrity and absolute integrity analysis of sample 1 and sample 9

[0173]

[0174] Example 2

[0175] The wastewater treatment recovery rate analysis of samples 1 to 9 is shown in the following table:

[0176] Table 3: Analysis of recovery rates of fluidized bed wastewater treatment for samples 1 to 9

[0177]

[0178] The above technical solutions of the present invention are only preferred embodiments of the present invention, and the patent scope of the present invention is not limited thereto. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A method for detecting the integrity of diatomite in a fluidized bed, characterized in that: Includes steps: Uniformly sample the diatomite to be tested and configure the sample into a slurry. After the slurry is sieved, the mass proportion a of the sieve-surface material in the diatomite is calculated; Obtaining an average specific surface area x of the diatomaceous earth to be tested; The integrity of diatoms A was calculated based on the following formula: Where: S is the reference specific surface area of ​​diatomite, ranging from 12 to 15 m 2 / g, the determination of the reference specific surface area S comprises the steps of: Screening a reference diatomaceous earth of the same type as the diatomaceous earth to be tested, which has high integrity and a recovery rate greater than 95% in a cyclone separation recovery system for fluidized bed wastewater treatment; The specific surface area of ​​the reference diatomaceous earth is measured as the reference specific surface area S.

2. The diatomite integrity detection method according to claim 1, characterized in that: The step of screening a reference diatomaceous earth of the same type as the diatomaceous earth to be tested, which has a high integrity and a recovery rate greater than 95% in a cyclone separation recovery system for fluidized bed sewage treatment, comprises: Observe the diatomaceous earth of the same type as the diatomaceous earth to be tested under a microscope at a magnification of 100 to 1000 times; Diatomaceous earth with a ratio of the amount of intact diatomaceous earth to the amount of all diatomaceous earth within the observation field of view greater than 70% is selected as the reference diatomaceous earth, wherein the equivalent particle size of the intact diatomaceous earth is 10-50 μm.

3. The diatomite integrity detection method according to claim 1, characterized in that: The diatom structure in the diatomite to be tested is sieve diatom.

4. The diatomite integrity detection method according to claim 1, characterized in that: The step of uniformly sampling the diatomite to be tested and configuring the sample into a slurry also includes: the solid-liquid ratio of the slurry is 1:10-1:

20.

5. The diatomite integrity detection method according to claim 1, characterized in that: The mesh number of the slurry screening is 200 meshes.

6. The diatomite integrity detection method according to claim 1, characterized in that: The S value is 15m 2 / g.

7. A method for predicting diatomite recovery rate in a fluidized bed, characterized in that: Includes steps: The diatomite to be tested is prepared into a slurry, and after the slurry is sieved, the mass proportion a of the sieve-surface material in the diatomite is calculated; Obtaining an average specific surface area x of the diatomaceous earth; The integrity of diatoms A was calculated based on the following formula: Where: S is the reference specific surface area of ​​diatomite, ranging from 12 to 15 m 2 / g, the determination of the reference specific surface area S comprises the steps of: Screening a reference diatomaceous earth of the same type as the diatomaceous earth to be tested, which has high integrity and a recovery rate greater than 95% in a cyclone separation recovery system for fluidized bed wastewater treatment; Determine the specific surface area of ​​the reference diatomaceous earth as the reference specific surface area S; The predicted recovery rate is determined based on the diatom integrity A: When the diatom integrity A is [1.05, 1.10), the predicted recovery rate is [96%, 97%); When the diatom integrity A is [1, 1.05), the predicted recovery rate is [95%, 96%); When the diatom integrity A is [0.95, 1), the predicted recovery rate is [94%, 95%); When the diatom integrity A is [0.90, 0.95), the predicted recovery rate is [92%, 94%); When the diatom integrity A is [0.85, 0.90), the predicted recovery rate is [88%, 92%); When the diatom integrity A is [0.80, 0.85), the predicted recovery rate is [83%, 88%); When the diatom integrity A is [0.75, 0.80), the predicted recovery rate is [77%, 83%); When the diatom integrity A is [0.70, 0.75), the predicted recovery rate is [71%, 77%); When the diatom integrity A is [0.65, 0.70), the predicted recovery rate is [64%, 71%); When the diatom integrity A is [0.60, 0.65), the predicted recovery rate is [57%, 64%); When the diatom integrity A is [0.55, 0.60), the predicted recovery rate is [50%, 57%); When the diatom integrity A is [0.50, 0.55), the predicted recovery rate is [42%, 50%).

8. An application of the diatomite recovery rate prediction method for a fluidized bed as claimed in claim 7 in sewage treatment, characterized in that: Includes steps: Based on the diatomite integrity detection method for a fluidized bed according to any one of claims 1 to 6, a first diatomite with an integrity A greater than 1 is screened out; The sewage enters the biochemical pool, which is divided into an anaerobic zone, an anoxic zone, an aerobic zone and a concentration and separation zone in sequence along the flow direction of the sewage, and the first diatomaceous earth is added to the anaerobic zone, the anoxic zone and the aerobic zone respectively, and stirred and mixed to form a mixed liquid; The mixed liquid flowing into the concentration and separation zone is concentrated and separated to obtain a concentrated liquid, and the concentrated liquid is returned to the anaerobic zone; after the supernatant in the concentration and separation zone is discharged, it passes through a high-efficiency clarification tank, a filtration tank and a disinfection tank in sequence to achieve water purification, and the separated residual sludge is transported to a cyclone separation recovery system; the cyclone separation recovery system cyclones out sludge particles, and the sludge particles include a second diatomaceous earth and activated sludge attached to the surface of the second diatomaceous earth; The sludge particles are collected, and the recovery rate of the first diatomaceous earth is predicted according to the method for predicting the recovery rate of diatomaceous earth for a fluidized bed according to claim 7, and the amount of the third diatomaceous earth added is calculated, and the sludge particles are mixed with the third diatomaceous earth and then put into the anaerobic zone, the anoxic zone, and the aerobic zone to continue to participate in the sewage treatment.

9. The use according to claim 8, characterized in that: The added amount of the third diatomaceous earth is (1-the predicted recovery rate) times the total mass of the first diatomaceous earth.

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