Intelligent sewage treatment HPB-MBR system and control method

Abstract

The invention provides an intelligent sewage treatment HPB-MBR system and a control method. The sewage treatment device comprises a biochemical pool, a multi-stage rotational flow concentration mechanism and an MBR (Membrane Bioreactor) pool which are communicated in sequence, the biochemical tank comprises an anaerobic tank, an anoxic tank and an aerobic tank which are communicated in sequence. The multi-stage rotational flow concentration mechanism is communicated with the aerobic tank and comprises 2-3 stages of rotational flow concentration mechanisms which are connected in series. And the MBR tank is communicated with an overflow discharge hole of the first-stage cyclone concentrator. And the MBR tank is provided with a backflow pipeline and a drainage pipeline. And the return pipeline is communicated with the aerobic tank. The number of stages of the multi-stage rotational flow concentration mechanism is proper, so that sludge with relatively large specific gravity can be relatively thoroughly separated and flows back to the anoxic tank and / or the aerobic tank through the first reflux. Thus, the flow of the first reflux is relatively small, the concentration of sludge entering the MBR tank is low, the flow of the MBR tank for the second reflux is also small, the energy consumption is reduced, and the degree of influence of the second reflux on dissolved oxygen of the aerobic zone is reduced.

Description

Technical Field

[0001] The present invention relates to the field of sewage membrane treatment, and in particular to an intelligent sewage treatment HPB-MBR system and a control method. Background Art

[0002] The MBR process, full name Membrane Bio-Reactor process, combines membrane separation technology with traditional biological treatment technology (activated sludge method) and uses membrane components as a means of solid-liquid separation to achieve efficient removal of pollutants in sewage and recycling of clean water. The MBR process has the advantages of smaller footprint and better effluent quality, but it also faces some problems and challenges in practical applications. At present, the MBR process has problems such as membrane pollution and flux decline, high investment and operating costs. At present, in order to solve the above problems, the engineering adopts the method of increasing the return ratio of the MBR pool to reduce the sludge concentration of the MBR pool, thereby increasing the membrane flux and ensuring the distribution of the sludge concentration. Generally speaking, the return ratio of the MBR pool in the engineering to the front end of the aerobic pool is 4-6, the return ratio of the end of the aerobic pool to the front end of the anoxic pool is 2-4, and the return ratio of the end of the anoxic pool to the front end of the anaerobic pool is 1-2. Due to the presence of aeration devices in the MBR pool, the return liquid carries a large amount of dissolved oxygen, which can easily cause the dissolved oxygen in the aerobic zone to be too high, thereby destroying the dissolved oxygen environment in the anoxic and anaerobic zones, making it difficult to ensure the effluent quality and quantity.

[0003] At present, there are two main technical means to solve the problem. One is to reduce the sludge concentration entering the MBR pool from the biochemical pool by adding sedimentation tanks such as secondary sedimentation tanks, inclined plate sedimentation tanks, and magnetic coagulation sedimentation tanks. This type of process adds sedimentation tanks on the basis of the original MBR process, and the process covers an increased area, which is difficult to use in projects with scarce land resources. The second is to use mechanical concentration devices to concentrate the activated sludge, thereby reducing the sludge concentration entering the MBR pool. The activated sludge concentration process has high energy consumption, which increases the process energy consumption. The current solution ideas cannot solve the problems of energy consumption and land occupation at the same time, and do not solve the environmental damage to the dissolved oxygen in the biochemical pool caused by the return sludge. Summary of the invention

[0004] The main purpose of the present invention is to provide an intelligent sewage treatment HPB-MBR system and control method to solve the problem that the existing methods cannot solve the problems of energy consumption and land occupation at the same time, and do not solve the technical problem of environmental damage to dissolved oxygen in the biochemical pool caused by return sludge.

[0005] To achieve the above object, the present invention provides an intelligent sewage treatment HPB-MBR system, comprising a biochemical pool, a multi-stage cyclone concentration mechanism and an MBR pool connected in sequence;

[0006] The biochemical pool comprises an anaerobic pool, an anoxic pool and an aerobic pool which are connected in sequence. The biochemical pool has a flowing carrier and a HPB mixed liquid formed based on the carrier.

[0007] The multi-stage cyclone concentrating mechanism is connected to the aerobic tank, and the multi-stage cyclone concentrating mechanism includes 2 to 3 stages of cyclone concentrating mechanisms arranged in series. Each stage of the cyclone concentrating mechanism includes a cyclone concentrator, an inlet pump located on the water inlet side of the cyclone concentrator, and an outlet pump located on the bottom flow discharge side of the cyclone concentrator, and the bottom flow discharge side of the cyclone concentrator of any stage is connected to at least one of the anaerobic tank and the anoxic tank for the first reflux. Among them, the adjustment range of each stage of the inlet pump meets the requirements of the inlet flow rate, the inlet flow rate of the first stage cyclone concentrator is in the range of 0.5m / s to 1.5m / s, the inlet flow rate of the second stage cyclone concentrator is in the range of 1.5 to 3.0m / s, and the inlet flow rate of the third stage cyclone concentrator is in the range of 2.5 to 5m / s. The first stage cyclone concentrator, the second stage cyclone concentrator and the third stage cyclone concentrator are arranged in sequence from far to near according to the distance from the aerobic tank.

[0008] The MBR pool is connected to the overflow outlet of the first-stage cyclone concentrator. The MBR pool has a reflux pipeline and a drainage pipeline. The reflux pipeline is connected to the aerobic pool for a second reflux.

[0009] According to an embodiment of the present application, the multi-stage cyclone concentrating mechanism includes three stages of cyclone concentrating mechanisms arranged in series.

[0010] The third-stage cyclone concentrator can control whether to perform cyclone concentration;

[0011] The intelligent sewage treatment HPB-MBR system also includes an intelligent controller, the control end of which is respectively connected to each level of cyclone concentrating mechanism, and is used to adjust the split ratio of each level of cyclone concentrating mechanism through the corresponding inlet pump and the corresponding outlet pump to obtain the corresponding optimal concentration efficiency.

[0012] According to an embodiment of the present application, the sewage treatment device further comprises an override pipe, which is directly connected between the second-stage cyclone concentrator and the aerobic tank. The override pipe and the third-stage cyclone concentrator are respectively provided with an inlet valve for controlling whether the third-stage cyclone concentrator performs cyclone concentrating.

[0013] According to an embodiment of the present application, the sewage treatment device includes a flow meter for measuring the flow rate on the water inlet side of each stage of the cyclone concentrator.

[0014] and / or; the optimal split ratios corresponding to the cyclone concentrators at each stage are completely the same, partially the same, or completely different. The adjustment range of the outflow pump at each stage meets the requirements of the optimal split ratio of the corresponding cyclone concentrator.

[0015] The present application also discloses a control method for an intelligent sewage treatment HPB-MBR system, comprising:

[0016] The sewage to be treated is passed into a biochemical pool for treatment, wherein the biochemical pool comprises an anaerobic pool, an anoxic pool and an aerobic pool which are connected in sequence, and the biochemical pool has a flowing carrier and a HPB mixed liquid formed based on the carrier.

[0017] The effluent from the aerobic pool is passed through a multi-stage cyclone concentrating mechanism for treatment, and the bottom flow effluent from each stage of the cyclone concentrator is returned to at least one of the anaerobic pool and the anoxic pool for a first reflux. The multi-stage cyclone concentrating mechanism includes 2 to 3 stages of cyclone concentrating mechanisms arranged in series. Each stage of the cyclone concentrating mechanism includes a cyclone concentrator, an inlet pump located on the water inlet side of the cyclone concentrator, and an outlet pump located on the bottom flow outlet side of the cyclone concentrator. The adjustment range of each stage of the inlet pump meets the requirements of the inlet flow rate. The inlet flow rate of the first stage cyclone concentrator is in the range of 0.5m / s to 1.5m / s, the inlet flow rate of the second stage cyclone concentrator is in the range of 1.5 to 3.0m / s, and the inlet flow rate of the third stage cyclone concentrator is in the range of 2.5 to 5m / s. The first stage cyclone concentrator, the second stage cyclone concentrator and the third stage cyclone concentrator are arranged in sequence from far to near according to the distance from the aerobic pool.

[0018] The sludge from the overflow outlet of the first-stage cyclone concentrator is passed into the MBR pool for treatment. The MBR pool has a return pipe and a drainage pipe. The return pipe is connected to the aerobic pool for the second return.

[0019] According to an embodiment of the present application, the multi-stage cyclone concentrating mechanism includes three stages of cyclone concentrating mechanisms arranged in series. The third stage cyclone concentrator can control whether to perform cyclone concentrating, thereby adjusting the number of stages of cyclone concentrating.

[0020] According to the implementation of the present application, when 50%≤SV30 of sludge in the effluent of the aerobic tank<80%, two-stage concentration is performed, and when 80%≤SV30 of sludge in the effluent of the aerobic tank<95%, three-stage concentration is performed.

[0021] According to an embodiment of the present application, when the water temperature in the aerobic pool is lower than 18°C, tertiary concentration is performed, and when the water temperature in the aerobic pool is higher than 18°C, secondary concentration is performed.

[0022] According to an embodiment of the present application, the first reflow is connected to the anoxic tank and the anaerobic tank at the same time.

[0023] When the inlet TN load of the sewage to be treated is 0.8 to 1.0 times the design value, the proportion of the first reflux entering the anoxic tank is reduced.

[0024] When the inlet TN load of the sewage to be treated is 1.0 to 1.2 times the design value, the proportion of the first reflux entering the anoxic tank is increased.

[0025] According to an embodiment of the present application, the first reflow is connected to the anoxic tank and the anaerobic tank at the same time.

[0026] When the influent TP load of the sewage to be treated is 0.8 to 1.0 times the design value, the proportion of the first reflux entering the anoxic tank is increased.

[0027] When the influent TP load of the sewage to be treated is 1.0 to 1.2 times the design value, the proportion of the first reflux entering the anoxic tank is reduced.

[0028] In the above-mentioned intelligent sewage treatment HPB-MBR system, the activated sludge in the biochemical pool is formed on the carrier, and biologically coated heavy sludge particles will be formed, the sludge sedimentation performance is greatly improved, and the concentration efficiency is increased. The multi-stage cyclone thickening mechanism has an appropriate number of stages, and the sludge with a larger specific gravity can be separated more thoroughly at a lower power, and returned to the anoxic tank and / or the aerobic tank through the first return. In this way, the flow rate of the first return is relatively small, and the sludge concentration entering the MBR pool is low, and the flow rate of the second return in the MBR pool is also small. Therefore, the overall return of the sewage treatment device is relatively low, which reduces energy consumption, and the second return has a reduced impact on the dissolved oxygen in the aerobic zone. In addition, the volume of the cyclone thickening mechanism is also small, and the process occupies a small area. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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.

[0030] Figure 1 It is a structural schematic diagram of an intelligent sewage treatment HPB-MBR system according to one embodiment of the present application.

[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0033] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0035] 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.

[0036] After extensive research, the applicant found that the activated sludge process has low treatment efficiency. By combining it with a membrane module, the sludge concentration can be controlled at a higher level (10-15g / L), thereby achieving an increase in biomass and enhancing the efficiency of pollutant removal. However, high-concentration activated sludge enters the membrane pool, resulting in increased membrane pollution and decreased flux, and poor impact resistance. In order to solve the above problems, the engineering often adopts methods such as increasing the reflow ratio of the membrane pool and increasing the aeration volume of the membrane pool to maintain the stability of the water produced by the membrane pool. The above methods not only greatly increase the energy consumption of the process operation, but also carry a large amount of dissolved oxygen in the reflux liquid, which will cause the environment of the anoxic zone and the anaerobic zone to be destroyed, making it difficult to ensure the effluent water quality.

[0037] Based on this, the present invention provides an intelligent sewage treatment HPB-MBR system, see Figure 1 , including a biochemical pool, a multi-stage cyclone concentration mechanism 4 and an MBR pool 5.

[0038] The biochemical pool, the multi-stage cyclone concentrating mechanism 4 and the MBR pool 5 are connected in sequence, such as through pipelines. There are no specific requirements for pipeline parameters at different positions, such as diameter and material, which can be selected according to design requirements.

[0039] The biochemical pool comprises an anaerobic pool 1, an anoxic pool 2 and an aerobic pool 3 which are connected in sequence. The biochemical pool has a flowing carrier and a HPB mixed liquid formed based on the carrier.

[0040] The biochemical pool uses the HPB process, namely the High Concentration Powder Carrier Bio-fluidized Bed technology. Specifically, powder carriers are added to the biochemical pool to increase the concentration of the mixed liquid in the biochemical pool, and at the same time, a microbial system of suspended growth and attached growth "double mud" symbiosis is constructed, and solid-liquid separation is carried out through the secondary sedimentation tank; and the powder carriers in the discharged residual sludge are recovered and recycled, achieving double mud ages, overcoming the contradiction in the iterative cycle of denitrification and phosphorus removal bacteria, and simultaneously strengthening the effect of biological denitrification and phosphorus removal.

[0041] The multi-stage cyclone concentrating mechanism 4 is connected to the aerobic tank 3 (exemplarily, a delivery pump 8 is provided on the pipeline between the two), and the multi-stage cyclone concentrating mechanism 4 includes 2 to 3 stages of cyclone concentrating mechanisms arranged in series. Each stage of the cyclone concentrating mechanism includes a cyclone concentrator, an inflow pump located on the water inlet side of the cyclone concentrator, and an outflow pump located on the underflow discharge side of the cyclone concentrator, and the underflow discharge side of the cyclone concentrator at any stage is connected to at least one of the anaerobic tank 1 and the anoxic tank 2 for the first reflux. Among them, the adjustment range of each stage of the inlet pump meets the requirements of the inlet flow rate. The inlet flow rate of the first-stage cyclone concentrator is in the range of 0.5m / s to 1.5m / s, the inlet flow rate of the second-stage cyclone concentrator is in the range of 1.5 to 3.0m / s, and the inlet flow rate of the third-stage cyclone concentrator is in the range of 2.5 to 5m / s. The first-stage cyclone concentrator, the second-stage cyclone concentrator and the third-stage cyclone concentrator are arranged in sequence from far to near according to the distance from the aerobic tank 3.

[0042] The multi-stage cyclone concentrating mechanism 4 is connected to the biochemical pool and the MBR pool 5 through pipelines, and the structures inside the multi-stage cyclone concentrating mechanism 4 are also connected through pipelines. For example, each cyclone concentrating mechanism is also connected to the adjacent cyclone concentrating mechanism through pipelines.

[0043] Each cyclone concentrating mechanism includes a cyclone concentrator, an inlet pump and an outlet pump. For example, the first cyclone concentrating mechanism includes a corresponding first inlet pump 9 and a first outlet pump 11. The second cyclone concentrating mechanism includes a corresponding second inlet pump 17 and a second outlet pump 18. The third cyclone concentrating mechanism includes a corresponding third inlet pump 8 and a third outlet pump 10.

[0044] The cyclone has an underflow port, an overflow port and an inlet. The inlet is usually designed as a tangential entry pipe, which is used to introduce the fluid to be separated into the cyclone at a certain pressure and speed. This tangential entry method can produce a strong rotational motion, which helps to achieve fluid separation. The overflow port is usually located at the top of the cyclone, and the overflow port is used to export the light mixed liquid after screening (also called the first mixed liquid). The underflow port is located at the bottom of the cyclone. The underflow port is used to export the heavy mixed liquid after screening (also called the second mixed liquid).

[0045] The underflow port, overflow port and inlet port of the cyclone are all connected to other structures through pipelines. In any two adjacent cyclone concentrating mechanisms connected in series, the inlet port of the cyclone concentrator of the latter stage is connected to the overflow port of the cyclone concentrator of the previous stage. Therefore, the inlet pump of each stage of the cyclone concentrating mechanism is arranged on the pipeline connected to the inlet port. Correspondingly, the outlet pump of each stage of the cyclone concentrating mechanism is arranged on the pipeline connected to the underflow port.

[0046] The inlet pump can adjust the inlet flow rate of the corresponding cyclone concentrator. For example, the adjustment range of the inlet flow rate of the first-stage cyclone concentrator is 0.5m / s~1.5m / s, the adjustment range of the inlet flow rate of the second-stage cyclone concentrator is 1.5~3.0m / s, and the adjustment range of the inlet flow rate of the third-stage cyclone concentrator is 2.5~5m / s. Since the corresponding pipeline diameter of the cyclone concentrator is fixed, the inlet pump can actually directly adjust the inlet flow rate of the cyclone concentrator.

[0047] The split ratio of a cyclone concentrator is an important parameter that affects its separation efficiency and performance. The split ratio refers to the volume ratio of the overflow at the overflow port and the underflow at the underflow port. Similarly, the outflow pump can adjust the underflow flow rate by adjusting the underflow flow rate, thereby adjusting the split ratio of the cyclone concentrator. The purpose of the outflow pump is to make the corresponding cyclone concentrator operate at a split ratio corresponding to a higher separation efficiency and performance.

[0048] For example, in a cyclone concentrator, when the split ratio of the cyclone concentrator is 1:1, the separation efficiency and performance of the cyclone concentrator are the highest. If the cyclone concentrator does not have an outflow pump, when the inflow pump only wants to adjust the flow rate from 0.4m / s to 0.8m / s. In fact, the split ratio of the corresponding cyclone concentrator will change. Therefore, the outflow pump needs to be linked with the inflow pump to adjust the flow rate of the bottom flow to double, so as to ensure that the split ratio remains unchanged and is still 1:1.

[0049] The underflow port of each stage of the cyclone concentrator is connected to at least one of the anaerobic tank 1 and the anoxic tank 2 through a pipeline for the first reflux. The first reflux R can be understood as the reflux operation of the material flowing out of the underflow port of all cyclone concentrators. Figure 1, the reflux ratio of the first reflux R is 4 to 8. Among them, when there are two-stage cyclone concentration mechanisms for cyclone concentration, that is, two-stage concentration reflux is performed, and the first reflux R is 2.5. When there are three-stage cyclone concentration mechanisms for cyclone concentration, that is, three-stage concentration reflux is performed, and the first reflux R is 5.5.

[0050] In the specific cyclone concentrator, since the carrier added by the HPB process will form biologically coated heavy sludge particles after maturity, the sludge settling performance is greatly improved and the concentration efficiency is increased. Therefore, the concentration of the material flowing out of the bottom flow port is higher, and its volume is correspondingly smaller, so the reflux volume of the first reflux is smaller. After multi-stage cyclone concentration in series, the sludge concentration entering the MBR pool 5 is also greatly reduced.

[0051] The MBR pool 5 is connected to the overflow outlet of the first-stage cyclone concentrator. The MBR pool 5 has a reflux pipeline and a drainage pipeline. The reflux pipeline (exemplarily, the reflux pipeline has a second reflux pump 12) is connected to the aerobic pool 3 for a second reflux.

[0052] Since the sludge concentration entering the MBR pool 5 is relatively low, the MBR pool 5 only needs to be at a relatively low return flow rate to reach the ideal concentration required for the operation of the MBR pool 5, that is, the designed sludge concentration value of the MBR pool 5. Figure 1 , it can be seen that the reflux rate of the second reflux r is small. Whether the two-stage cyclone concentrating mechanism or the three-stage cyclone concentrating mechanism performs cyclone concentration, the reflux ratio of the second reflux r is less than or equal to 1.

[0053] The sum of the first reflux R and the second reflux r is the overall reflux volume. The overall reflux volume is greatly reduced. Under the same standard, the overall reflux ratio of the process is less than that of the simple MBR process.

[0054] The following is a flowchart to explain the working principle of the intelligent sewage treatment HPB-MBR system. Figure 1 In some embodiments, the intelligent sewage treatment HPB-MBR system includes: an anaerobic tank 1, an anoxic tank 2, an aerobic tank 3, a carrier dosing device 7, a multi-stage cyclone concentration mechanism 4, an MBR tank 5, and a carrier recovery device 6.

[0055] The sewage after sand removal enters the biochemical system through the water distribution channel, and enters the anaerobic tank 1, aerobic tank 3, and anoxic tank 2 in order. The mud-water mixture after full reaction enters the multi-stage cyclone concentration mechanism 4. After the mud-water mixture is concentrated step by step by the multi-stage cyclone concentration mechanism 4, the low-concentration mixture finally enters the MBR tank 5, and the high-concentration return liquid flows back to the front end of the anaerobic tank 1 and the anoxic tank 2. The mixed liquid in the MBR tank 5 is effluent after membrane filtration, and part of the filtered sludge flows back to the front end of the aerobic tank 3, and the other part enters the carrier recovery device 6 for carrier recovery. After the sludge passes through the carrier recovery device 6, the sludge rich in a large amount of carriers at the lower outlet flows back to the front end of the anoxic tank 2 through the first reflux pump 13, and the upper outlet sludge is discharged for sludge disposal.

[0056] The carrier dosing device 7 adds the hydrophilic carrier to the aerobic tank 3, and the maturation time of the carrier is about 2 weeks. The maturity sign of the carrier is the formation of heavy sludge particles with biological coating on the surface. At this time, the heavy sludge particles enter the multi-stage cyclone concentration mechanism 4, and the concentration efficiency is greatly improved. The number of concentration levels can be calculated by the following iterative method. It is calculated that when the number of concentration levels is greater than 3, the reflux ratio R is greater than 10, and the economic benefit is low. The number of concentration levels can be selected as two or three. The surface of the carrier is coated with a biofilm, and no scratches will be generated when the sludge enters the MBR tank 5. After multi-stage concentration, the sludge concentration entering the MBR tank 5 is reduced, and the membrane flux is increased.

[0057] See also Figure 1 , the specific calculation process is as follows:

[0058] Where: Q: design value of inlet and outlet water, C is the design sludge concentration value of MBR pool, g / L;

[0059] Q1: Flow rate from aerobic pool to concentrator pool, value is 6~9Q, m 3 / d;

[0060] Q2: The flow rate of the concentration unit into the MBR pool is 4 to 8Q, m 3 / d;

[0061] q i : i is the number of concentration stages, and the flow rate of the last stage is q1, and q1 = (1 + r) · Q;

[0062] r: MBR pool return ratio r≤1;

[0063] R: reflux ratio of concentration unit;

[0064] C: sludge concentration of MBR pool, design value, g / L;

[0065] C1: anaerobic tank sludge concentration, g / L;

[0066] C2: sludge concentration in anoxic tank, g / L;

[0067] C3: aerobic tank sludge concentration, g / L;

[0068] C0: turbidity in influent water, g / L;

[0069] C 3i :i is the concentration stage, and the last stage sludge concentration is C 31 ,and

[0070] The frequency conversion of the lower pump of the multi-stage cyclone concentrating mechanism 4 realizes a stable reflux ratio, thereby ensuring the concentrating effect of each stage of the multi-stage cyclone concentrating mechanism 4. The specific method is as follows:

[0071] When the water inlet volume changes, the inlet flow rate of each level of concentrate can be obtained through the flow meter, and the inlet tangential velocity of each level of concentrate can be calculated. The calculation method is to divide the inlet flow rate by the cross-sectional area of ​​the water inlet pipe. The inlet tangential velocity range of each level of concentrate is:

[0072] The flow rate of the first-stage concentrate inlet is in the range of 0.5m / s to 1.5m / s, the flow rate of the second-stage concentrate inlet is 1.5 to 3.0m / s, and the flow rate of the third-stage concentrate inlet is 2.5 to 5m / s. The flow value of the lower outlet of each stage of concentrate can be calculated by the inlet flow rate and split ratio of each stage of concentrate. The calculation method is: Where kn is the concentration ratio of this stage. The lower inlet variable frequency pump adjusts the lower inlet flow rate through frequency conversion.

[0073] The calculation method of the multi-stage cyclone thickening mechanism adopts the iteration method. The specific calculation method is: when the number of thickening stages is one, the flow ratio of the lower port to the upper port is set to k1, and the sludge concentration of the lower port to the sludge concentration of the upper port is z1. According to the flow conservation law, the inlet flow of the first-stage thickener = outlet flow + reflux flow, and the outlet flow is q1, then the lower port flow is k1·q1, and the inlet flow is (1+k1)·q1; according to the material conservation law, the inlet material = outlet material + reflux material, and the outlet material is q1·C 31 , the lower material is k1·z1·q1·C 31 , then the imported material is C1+k1·z1)·q1·C 31 The material and flow distribution from level 2 to level n can be calculated in sequence.

[0074] The above-mentioned intelligent sewage treatment HPB-MBR system mainly includes the following two improvements:

[0075] 1. Construction of heavy sludge system

[0076] HPB technology is used to build a heavy sludge system, and the sludge density is reduced from 1.04 to 1.07 g / cm2 of traditional activated sludge. 3 Increased to 1.14~1.19g / cm 3, the treatment efficiency is improved, and the concentration performance is improved by 2 to 4 times compared with the activated sludge method.

[0077] 2. Construction of multi-stage concentration system

[0078] Multi-stage concentrating cyclones are used to maintain the sludge concentration in the biochemical section (10-15g / L), improve the treatment efficiency of the biochemical system, and reduce the sludge concentration entering the membrane pool (3.0-7.5g / L), thereby effectively controlling the reflow ratio and aeration air volume, stabilizing the water production, and giving full play to the MBR process's role in efficiently treating water.

[0079] In the above-mentioned intelligent sewage treatment HPB-MBR system, the activated sludge in the biochemical pool is formed on the carrier, and biologically coated heavy sludge particles will be formed, the sludge sedimentation performance is greatly improved, and the concentration efficiency is increased. The multi-stage cyclone concentrating mechanism 4 has an appropriate number of stages, and the sludge with a larger specific gravity can be separated more thoroughly at a lower power, and returned to the anoxic tank 2 and / or the aerobic tank 3 through the first return. In this way, the flow rate of the first return is relatively small, and the sludge concentration entering the MBR pool 5 is low, and the flow rate of the second return of the MBR pool 5 is also small. Therefore, the overall return of the sewage treatment device is relatively low, which reduces energy consumption, and the second return has a reduced impact on the dissolved oxygen in the aerobic zone. In addition, the volume of the cyclone concentrating mechanism is also small, and the process occupies a small area.

[0080] In some embodiments, the multi-stage cyclone concentrating mechanism 4 includes three stages of cyclone concentrating mechanisms arranged in series.

[0081] The third-stage cyclone concentrator can control whether to perform cyclone concentration. According to the above analysis, the number of concentration levels can be selected as two or three. Therefore, when three-stage concentration is required, the third-stage cyclone concentrator can be adjusted to perform cyclone concentration, thereby performing three-stage concentration. When two-stage concentration is required, the third-stage cyclone concentrator can be adjusted not to perform cyclone concentration, thereby performing two-stage concentration. Compared with two-stage concentration, three-stage concentration has a larger reflux ratio and higher energy consumption. This design can be adjusted as needed so that the sewage treatment device operates at an appropriate number of concentration levels.

[0082] In some embodiments, the intelligent sewage treatment HPB-MBR system also includes an intelligent controller, the control end of which is respectively connected to each level of cyclone concentrating mechanism, and is used to adjust the diversion ratio of each level of cyclone concentrating mechanism through the corresponding inlet pump and the corresponding outlet pump to obtain the corresponding optimal concentration efficiency.

[0083] For example, the control end of the intelligent controller is respectively connected to the inlet pump and the outlet pump corresponding to each level of the cyclone concentration mechanism to control the flow rate of the inlet pump and the outlet pump, thereby controlling the split ratio.

[0084] In some embodiments, the sewage treatment device further comprises a bypass pipe, which is directly connected between the second-stage cyclone concentrator and the aerobic tank 3. The bypass pipe and the third-stage cyclone concentrator are respectively provided with an inlet valve for controlling whether the third-stage cyclone concentrator performs cyclone concentrating. This method has a simple structural design and is easy to adjust.

[0085] In some embodiments, the sewage treatment device includes a flow meter for measuring the flow rate of the water inlet side of each stage of the cyclone concentrator. This design facilitates the detection of the water inlet flow rate of each stage of the cyclone concentrator, thereby facilitating regulation according to needs.

[0086] In some embodiments, the optimal split ratios corresponding to the cyclone concentrators at each stage are completely the same, partially the same, or completely different. The adjustment range of the outflow pump at each stage meets the requirements of the optimal split ratio of the corresponding cyclone concentrator.

[0087] The optimal split ratio corresponding to each level of cyclone concentrators is the split ratio corresponding to the optimal separation efficiency and performance of the cyclone concentrators. The specifications of the cyclone concentrators at each level can be completely the same, partially the same, or completely different.

[0088] The present application also discloses a control method for an intelligent sewage treatment HPB-MBR system, comprising:

[0089] The sewage to be treated is passed into a biochemical pool for treatment, wherein the biochemical pool comprises an anaerobic pool 1, an anoxic pool 2 and an aerobic pool 3 which are connected in sequence, and the biochemical pool has a flowing carrier and a HPB mixed liquid formed based on the carrier.

[0090] The effluent from the aerobic pool 3 is passed through a multi-stage cyclone concentrating mechanism 4 for treatment, and the bottom flow effluent from each stage of the cyclone concentrator is returned to at least one of the anaerobic pool 1 and the anoxic pool 2 for a first reflux. The multi-stage cyclone concentrating mechanism 4 includes 2 to 3 stages of cyclone concentrating mechanisms arranged in series. Each stage of the cyclone concentrating mechanism includes a cyclone concentrator, an inflow pump located on the water inlet side of the cyclone concentrator, and an outflow pump located on the bottom flow effluent side of the cyclone concentrator. The adjustment range of each stage of the inflow pump meets the requirements of the inflow flow rate. The inflow flow rate of the first stage cyclone concentrator is in the range of 0.5m / s to 1.5m / s, the inflow flow rate of the second stage cyclone concentrator is in the range of 1.5 to 3.0m / s, and the inflow flow rate of the third stage cyclone concentrator is in the range of 2.5 to 5m / s. The first stage cyclone concentrator, the second stage cyclone concentrator and the third stage cyclone concentrator are arranged in sequence from far to near according to the distance from the aerobic pool 3.

[0091] The sludge from the overflow outlet of the first-stage cyclone concentrator is passed into the MBR pool 5 for treatment. The MBR pool 5 has a return pipe and a drainage pipe. The return pipe is connected to the aerobic pool 3 for the second return.

[0092] The control method of the intelligent sewage treatment HPB-MBR system has the beneficial effects corresponding to the above-mentioned intelligent sewage treatment HPB-MBR system, and its specific beneficial effects are not repeated. The control method of the intelligent sewage treatment HPB-MBR system can be operated by the intelligent sewage treatment HPB-MBR system, and can also be operated by other sewage treatment devices.

[0093] In some embodiments, the multi-stage cyclone concentrating mechanism 4 includes three stages of cyclone concentrating mechanisms arranged in series. The third stage cyclone concentrator can control whether to perform cyclone concentrating, thereby adjusting the stage number of cyclone concentrating.

[0094] In some embodiments, when 50%≤SV30 of sludge in the effluent of the aerobic tank 3<80%, two-stage concentration is performed, and when 80%≤SV30 of sludge in the effluent of the aerobic tank 3<95%, three-stage concentration is performed.

[0095] For example, when 80%≤SV30<95%, the overriding pipe electric valve (16) is controlled to be closed, and the concentration unit is operated at the third level. The SV30 value is obtained through online detection by the SV-N intelligent observation system.

[0096] As another example, when 80%≤SV30<95%, the control is to open the overrunning pipe electric valve (16), and the concentration unit is operated in the second stage. The SV30 value is obtained through online detection by the SV-N intelligent observation system.

[0097] In some embodiments, when the water temperature in the aerobic pool 3 is lower than 18°C, the tertiary concentration is performed, and when the water temperature in the aerobic pool 3 is higher than 18°C, the secondary concentration is performed.

[0098] Water temperature will affect the viscosity and sedimentation performance of sludge. Generally speaking, when the water temperature is low, the sludge viscosity becomes higher, the sedimentation performance becomes worse, and the concentration efficiency decreases, so it is necessary to choose three-stage concentration. Similarly, when the water temperature rises, the sludge viscosity becomes lower and the sedimentation performance becomes better, so two-stage concentration should be selected. For example, the water temperature data is obtained by an online temperature probe.

[0099] Exemplarily, when the water temperature is less than 18 degrees Celsius, the control is to close the override pipe electric valve (16), and the concentration unit is operated in the third stage.

[0100] As another example, when the water temperature is greater than 18 degrees Celsius, the control is to open the bypass pipe electric valve (16), and at this time the concentration unit operates in the second stage.

[0101] In some embodiments, the first reflow is connected to the anoxic tank 2 and the anaerobic tank 1 at the same time. When the influent TN load of the sewage to be treated is 0.8 to 1.0 times the design value, the proportion of the first reflow entering the anoxic tank 2 is reduced. When the influent TN load of the sewage to be treated is 1.0 to 1.2 times the design value, the proportion of the first reflow entering the anoxic tank 2 is increased.

[0102] In this case, only the change of the inlet TN load is considered, and the change of the inlet TP load is not considered. Figure 1 The first return flow enters the anoxic tank 2 and the anaerobic tank 1 through a pipeline, and the pipeline has at least one valve, by adjusting the proportion of the first return flow in the anoxic tank 2 and the anaerobic tank 1. For example, there is a valve (a first valve 15 connected to the anoxic tank 2 and a second valve 14 connected to the anaerobic tank 1) to adjust the proportion of the first return flow entering the anoxic tank 2.

[0103] In some embodiments, the first reflow is connected to the anoxic tank 2 and the anaerobic tank 1 at the same time. When the influent TP load of the sewage to be treated is 0.8 to 1.0 times the design value, the proportion of the first reflow entering the anoxic tank 2 is increased. When the influent TP load of the sewage to be treated is 1.0 to 1.2 times the design value, the proportion of the first reflow entering the anoxic tank 2 is reduced.

[0104] In this case, only the change of the inlet TP load is considered, and the change of the inlet TN load is not considered. Figure 1 The first return flow enters the anoxic tank 2 and the anaerobic tank 1 through a pipeline, and the pipeline has at least one valve, by adjusting the proportion of the first return flow in the anoxic tank 2 and the anaerobic tank 1. For example, there is a valve (a first valve 15 connected to the anoxic tank 2 and a second valve 14 connected to the anaerobic tank 1) to adjust the proportion of the first return flow entering the anoxic tank 2.

[0105] In some embodiments, if the influent TN load and the influent TP load become higher at the same time, the influent volume can be reduced, thereby reducing the TN load and the TP load in the biochemical pond.

[0106] Some intelligent control methods of HPB-MBR systems for sewage treatment can realize intelligent control methods.

[0107] Adjust the concentration and grading according to the water temperature and SV30.

[0108] When the water temperature is less than 18°C ​​or 50%≤SV30 of the sludge in the effluent of aerobic tank 3 is less than 80%, three-stage concentration reflux is adopted.

[0109] When the water temperature is greater than 18°C ​​or 80%≤the SV30 of the sludge in the effluent of the aerobic tank 3 is less than 95%, two-stage concentration reflux is adopted.

[0110] The SV30 is acquired by an SV automatic detection platform.

[0111] The underflow and overflow are both equipped with sludge concentration meters, and the operating frequency of the underflow pump is controlled according to the underflow / overflow values ​​to achieve the regulation of the split ratio. For example, by automatically sampling and detecting the SV30 value of the inflow and outflow, or the change in water temperature, the detection value is input into the result obtained by the intelligent controller calculation and analysis, and the control instruction is output to the corresponding mechanism for adjustment.

[0112] In general, the control method of the intelligent sewage treatment HPB-MBR system has the following advantages:

[0113] Advantage 1: The heavy sludge system is constructed by adding hydrophilic carriers, which reduces the harm of the carriers to the membrane and improves the concentration efficiency.

[0114] Advantage 2: Different from the method of increasing the return ratio of MBR pool 5 to return a large amount of high dissolved oxygen sludge to aerobic pool 3 or anoxic pool 2, the return ratio of MBR pool 5 in this patent r≤1 will not damage the dissolved oxygen environment in anaerobic pool 1 and anoxic pool 2.

[0115] Advantage 3: Compared with the sedimentation tank + MBR process, this process occupies a smaller area and has higher concentration efficiency.

[0116] Advantage 4: A calculation method for the material and flow rate of the concentration device is constructed to facilitate the evaluation and verification of the concentration efficiency and obtain the optimal combined operating conditions.

[0117] Advantage 5: The addition of carriers constructs a "mud film symbiosis" system, which can retain more long-generation microorganisms and improve the efficiency of nitrogen and phosphorus removal.

[0118] Advantage 6: The ratio of the concentrated liquid to the anaerobic and anoxic zones can be flexibly adjusted according to the influent pollutants to enhance the pollutant removal effect.

[0119] Example

[0120] In this case, the sludge concentration in the aerobic pool is 10.0 g / L. After being concentrated by the three-stage concentration unit, the sludge concentration entering the membrane pool is 3.5 g / L. The flow rate is 100 m 3 / d.

[0121] Among them, the inlet sludge concentration of the first-stage concentration is 7.0g / L, the lower sludge concentration is 12.0g / L, and the upper sludge concentration is 3.5g / L. The inlet flow rate of the first-stage concentration unit is 0.8m / s, and the water flow rate is 170m 3 / d, the lower return flow is 70m 3 / d.

[0122] The inlet sludge concentration of the secondary concentration unit is 8.4g / L, the lower inlet sludge concentration is 10.5g / L, and the upper inlet sludge concentration is 7.0g / L. The inlet flow rate of the secondary concentration unit is 1.8m / s, and the water flow rate is 288m 3 / d, the lower return flow is 119m 3 / d.

[0123] The inlet sludge concentration of the third-stage concentration unit is 10.0g / L, the lower sludge concentration is 12.6g / L, and the upper sludge concentration is 8.4g / L. The inlet flow rate of the second-stage concentration unit is 2.9m / s, and the water flow rate is 491m 3 / d, the lower return flow is 202m 3 / d.

[0124] The total recovery volume of the concentration unit is 391m 3 / d, the reflux ratio R of the concentration unit is 3.91, at this time r is 0.9, and the process reflux ratio is 4.81.

[0125] 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. An intelligent sewage treatment HPB-MBR system, characterized in that: It includes a biochemical pool, a multi-stage cyclone concentration mechanism and an MBR pool which are connected in sequence; The biochemical pool comprises an anaerobic pool, an anoxic pool and an aerobic pool which are connected in sequence, and the biochemical pool has a flowing carrier and a HPB mixed liquid formed based on the carrier; The multi-stage cyclone concentrating mechanism is connected to the aerobic tank, and the multi-stage cyclone concentrating mechanism includes 2 to 3 stages of cyclone concentrating mechanisms arranged in series; each stage of the cyclone concentrating mechanism includes a cyclone concentrator, an inlet pump located at the water inlet side of the cyclone concentrator, and an outlet pump located at the bottom flow discharge side of the cyclone concentrator, and the bottom flow discharge side of the cyclone concentrator of any stage is connected to at least one of the anaerobic tank and the anoxic tank for first reflux; wherein the adjustment range of each stage of the inlet pump meets the requirements of the inlet flow rate, the inlet flow rate of the first stage cyclone concentrator is in the range of 0.5m / s to 1.5m / s, the inlet flow rate of the second stage cyclone concentrator is in the range of 1.5 to 3.0m / s, and the inlet flow rate of the third stage cyclone concentrator is in the range of 2.5 to 5m / s, and the first stage cyclone concentrator, the second stage cyclone concentrator and the third stage cyclone concentrator are arranged in sequence from far to near according to the distance from the aerobic tank; The MBR pool is connected with the overflow outlet of the first-stage cyclone concentrator; the MBR pool has a reflux pipeline and a drainage pipeline; the reflux pipeline is connected with the aerobic pool for the second reflux.

2. The intelligent sewage treatment HPB-MBR system according to claim 1 is characterized in that: The multi-stage cyclone concentrating mechanism comprises three stages of cyclone concentrating mechanisms arranged in series; The third-stage cyclone concentrator can control whether to perform cyclone concentration; The intelligent sewage treatment HPB-MBR system also includes an intelligent controller, the control end of which is respectively connected to each level of cyclone concentrating mechanism, and is used to adjust the split ratio of each level of cyclone concentrating mechanism through the corresponding inlet pump and the corresponding outlet pump to obtain the corresponding optimal concentration efficiency.

3. The intelligent sewage treatment HPB-MBR system according to claim 1 is characterized in that: The sewage treatment device also includes an override pipe, which is directly connected between the second-stage cyclone concentrator and the aerobic tank; the override pipe and the third-stage cyclone concentrator are respectively provided with an inlet valve for controlling whether the third-stage cyclone concentrator performs cyclone concentration.

4. The intelligent sewage treatment HPB-MBR system according to any one of claims 1 to 3, characterized in that: The sewage treatment device comprises a flow meter for measuring the flow rate on the water inlet side of each stage of the cyclone concentrator; and / or; The optimal split ratios corresponding to the cyclone concentrators at each stage are completely the same, partially the same, or completely different; the adjustment range of the outflow pump at each stage meets the requirements of the optimal split ratio of the corresponding cyclone concentrator.

5. A control method for an intelligent sewage treatment HPB-MBR system, characterized in that: include: Passing the sewage to be treated into a biochemical pool for treatment, wherein the biochemical pool comprises an anaerobic pool, an anoxic pool and an aerobic pool connected in sequence, and the biochemical pool has a flowing carrier and a HPB mixed liquid formed based on the carrier; The effluent from the aerobic tank is passed through a multi-stage cyclone concentrating mechanism for treatment, and the bottom flow effluent from each stage of the cyclone concentrator is returned to at least one of the anaerobic tank and the anoxic tank for a first reflux; wherein the multi-stage cyclone concentrating mechanism comprises 2 to 3 stages of cyclone concentrating mechanisms arranged in series; each stage of the cyclone concentrating mechanism comprises a cyclone concentrator, an inflow pump located at the water inlet side of the cyclone concentrator, and an outflow pump located at the bottom flow effluent side of the cyclone concentrator; wherein the adjustment range of each stage of the inflow pump meets the requirements of the inflow flow rate, the inflow flow rate of the first stage cyclone concentrator is in the range of 0.5 m / s to 1.5 m / s, the inflow flow rate of the second stage cyclone concentrator is in the range of 1.5 to 3.0 m / s, and the inflow flow rate of the third stage cyclone concentrator is in the range of 2.5 to 5 m / s, and the first stage cyclone concentrator, the second stage cyclone concentrator and the third stage cyclone concentrator are arranged in sequence from far to near according to the distance from the aerobic tank; The sludge from the overflow outlet of the first-stage cyclone concentrator is introduced into the MBR pool for treatment; the MBR pool has a return pipe and a drainage pipe; the return pipe is connected to the aerobic pool for the second return.

6. The control method of the intelligent sewage treatment HPB-MBR system according to claim 5 is characterized in that: The multi-stage cyclone concentrating mechanism comprises three stages of cyclone concentrating mechanisms arranged in series; the third stage cyclone concentrator can control whether to perform cyclone concentrating, thereby adjusting the number of stages of cyclone concentrating.

7. The control method of the intelligent sewage treatment HPB-MBR system according to claim 6 is characterized in that: When 50%≤SV30 of sludge in the effluent of the aerobic tank<80%, two-stage concentration is performed; when 80%≤SV30 of sludge in the effluent of the aerobic tank<95%, three-stage concentration is performed.

8. The control method of the intelligent sewage treatment HPB-MBR system according to claim 6 is characterized in that: When the water temperature in the aerobic pool is lower than 18°C, the third stage of concentration is performed, and when the water temperature in the aerobic pool is higher than 18°C, the second stage of concentration is performed.

9. The control method of the intelligent sewage treatment HPB-MBR system according to claim 6 is characterized in that: The first reflux simultaneously connects the anoxic tank and the anaerobic tank; When the influent TN load of the sewage to be treated is 0.8 to 1.0 times the design value, reducing the proportion of the first reflux entering the anoxic tank; When the inlet TN load of the sewage to be treated is 1.0 to 1.2 times the design value, the proportion of the first reflux entering the anoxic tank is increased.

10. The control method of the intelligent sewage treatment HPB-MBR system according to claim 6, characterized in that: The first reflux simultaneously connects the anoxic tank and the anaerobic tank; When the influent TP load of the sewage to be treated is 0.8 to 1.0 times the design value, increasing the proportion of the first reflux entering the anoxic tank; When the influent TP load of the sewage to be treated is 1.0 to 1.2 times the design value, the proportion of the first reflux entering the anoxic tank is reduced.

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