Membrane method integrated water purification system, use method and breathing ceramsite filter material

Abstract

According to the membrane process integrated water purification system and the using method thereof, a filter tank, a breathing ceramsite filter material tank and an MCR technology are combined, pollutants in a water body can be effectively removed, meanwhile, the membrane process integrated water purification system can adapt to a water source with high turbidity, and the purposes of improving the impact resistance, reducing filter membrane pollution and blockage, reducing investment and energy consumption, reducing the occupied area and improving the water purification efficiency are achieved. And the quality of produced water is improved. Besides, the breathing ceramsite filter material prepared by the invention has a porous structure, the density of the breathing ceramsite filter material is slightly higher than that of water after the breathing ceramsite filter material absorbs water, the breathing ceramsite filter material can float out of the water surface during backwash with low-pressure water, and the exchange of water and air in open pores is improved.

Description

Technical Field

[0001] This application belongs to the technical field of water treatment, and particularly relates to an integrated membrane water purification system and its usage method, as well as a breathing ceramsite filter material. Background Art

[0002] The turbidity of surface and underground water sources is low. The particle size of low-turbidity water is fine and evenly dispersed in water, making it difficult for flocs to accumulate and form precipitation. Moreover, the suspended solid concentration in low-turbidity water is low, the particle movement speed is small, and the particle collision probability is small, which is not conducive to the formation of flocs, and the formed flocs are also easily damaged by coagulation stirring. When treating low-turbidity source water with conventional water treatment processes, it is usually necessary to add a high dose of flocculant and / or add additional particulate nuclei.

[0003] In the prior art, although column ultrafiltration can effectively remove bacteria, viruses, pathogenic protozoa, and particulate pollutants in water and is applied in the case of stable low-turbidity water sources, when encountering high-turbidity water sources caused by reasons such as rain, it is very easy to cause fouling of the ultrafiltration membrane and a significant decrease in water flux.

[0004] If ceramsite is used for water purification, due to problems such as large specific gravity, low porosity, and low opening rate of existing ceramsite, on the one hand, it requires a large amount of air for air washing, and on the other hand, it is not conducive to air exchange inside the ceramsite pores. Summary of the Invention

[0005] The purpose of this application is to overcome the defects of the prior art, etc., and provide a water purification system and method that can adapt to high-turbidity water sources, achieve advantages such as improving shock resistance, reducing investment and energy consumption, and improving water production quality.

[0006] This application provides an integrated membrane water purification system, which includes a filtration system and a membrane system that are interconnected. The filtration system includes a filter tank and a breathing ceramsite filter material tank, and the membrane system includes an MCR membrane tank, a water production tank, and a dosing device; the filter tank includes a first filtration structure, a water inlet, an air inlet, and a first overflow port. The first filtration structure, the water inlet, and the air inlet are arranged at the lower part of the filter tank, and the first overflow port is arranged at the upper part of the filter tank. The first overflow port is communicated with the inlet of the breathing ceramsite filter material tank; the breathing ceramsite filter material tank includes a second filtration structure and a water collection port. The water collection port is arranged at the bottom of the second filtration structure, and the water collection port is communicated with the water inlet of the MCR membrane tank; the water production port of the MCR membrane tank is communicated with the water inlet of the water production tank, and the dosing device adds medicine to the water production tank.

[0007] Preferably, the integrated membrane water purification system includes at least two layers of structures, and the layer where the filtration system is located is arranged above the layer where the membrane system is located.

[0008] Preferably, the second filtering structure includes breathing ceramsite filter media, and the breathing ceramsite filter media satisfies at least one of the following characteristics:

[0009] The filling degree of the breathing ceramsite filter media in the second filtering structure is 35-60%;

[0010] The porosity of the breathing ceramsite filter media is 35-80%;

[0011] The particle size range of the breathing ceramsite filter media is 5-30 mm; the density after water absorption saturation is 1020-1100 Kg / m3.

[0012] Preferably, a support plate is provided at the bottom of the first filtering structure. The height of the support plate near the breathing ceramsite filter media pool is higher than the height away from the breathing ceramsite filter media pool, and the angle formed by the height difference is 3-15°.

[0013] Preferably, the first filtering structure is sequentially provided with a filter media layer, an intermediate layer and a support layer from top to bottom. The support layer is placed on the support plate, and the first filtering structure satisfies at least one of the following characteristics:

[0014] The filter media layer includes quartz sand;

[0015] The intermediate layer includes fine cobblestones;

[0016] The diameter of the fine cobblestones is 5-10 mm;

[0017] The support layer includes coarse cobblestones;

[0018] The diameter of the coarse cobblestones is 20-30 mm.

[0019] Preferably, the bottom of the second filtering structure is inclined and supported with both ends high and the middle low. The inclined support is used to support the breathing ceramsite filter media. The lowest part of the inclined support is communicated with the water collecting port, and the water collecting port is communicated with the water inlet of the MCR membrane pool.

[0020] Preferably, the water collecting port is communicated with the water inlet of the MCR membrane pool through a vertical pipe.

[0021] Preferably, a water distributor is provided at the entrance of the breathing ceramsite filter media pool. The water distributor is composed of at least one inverted cone groove, and there is a water outlet hole at the bottom of the inverted cone groove.

[0022] Preferably, the MCR membrane pool includes a suction system, a pulse aeration device and at least one group of membrane modules. The pulse aeration device is arranged below the membrane modules, and the suction system is used to suck the gas and / or water in the membrane modules (11).

[0023] Preferably, the MCR membrane tank satisfies at least one of the following characteristics:

[0024] The membrane module is detachably installed in the MCR membrane tank by plugging;

[0025] The membrane module includes hollow fiber membrane filaments. The two ends of the hollow fiber membrane filaments are respectively the upper end and the lower end for filtered water outlet. The upper end and the lower end of the filtered water outlet are connected to a water collection device, and the water outlet of the water collection device is the water production outlet of the MCR membrane tank.

[0026] Preferably, a detection instrument is installed in the water production tank for monitoring the water quality of the water outlet of the water production tank.

[0027] This application also provides a usage method of the above-mentioned membrane integrated water purification system, including the following steps:

[0028] S1: Filter tank filtration: Air is purged from the air inlet and introduced into the filter tank. Water flows into the bottom of the filter tank from the water inlet. The water is filtered by the first filtration structure of the filter tank and overflows upward from the bottom to form overflow water. The overflow water enters the breathing ceramsite filter tank from the first overflow port;

[0029] S2: Breathing ceramsite filter tank filtration: After the overflow water enters the breathing ceramsite filter tank, it is filtered by the second filtration structure and then flows out from the water collection port at the bottom. The water flows into the MCR membrane tank;

[0030] S3: After the water is filtered by the MCR membrane tank, a permeate is generated. The permeate is transported from the water production outlet of the MCR membrane tank to the water production tank;

[0031] S4: The permeate is treated with sodium hypochlorite solution in the dosing device in the water production tank to generate product water, and the product water is discharged from the water outlet of the water production tank.

[0032] Preferably, the usage method satisfies at least one of the following characteristics:

[0033] The flow rate of the air is 300 - 650 m 3 / h;

[0034] The water inflow of the filter tank is 62 - 72 T / h;

[0035] The water inflow of the MCR membrane tank is 62 - 70 T / h;

[0036] The water inflow of the water production tank is 62 - 65 T / h;

[0037] The dosing amount of the sodium hypochlorite solution is 10 - 15 Kg / h;

[0038] The sodium hypochlorite content in the sodium hypochlorite solution is 0.7%;

[0039] Preferably, the quality of the produced water meets at least one of the following characteristics:

[0040] The turbidity is ≤ 0.1 NTU;

[0041] The COD is ≤ 1 mg / L;

[0042] The total number of colonies is ≤ 5 MPN / ml.

[0043] The present application also provides a preparation method of a breathing ceramsite filter material, and the preparation method includes the following steps:

[0044] S1: Providing raw materials and mixing them to form a slurry, where the raw materials include stone powder, quicklime powder, gypsum powder, foaming agent, ceramic reinforcing agent, cement, and water;

[0045] S2: Foaming and shaping the slurry at a preset temperature to form a breathing ceramsite;

[0046] S3: Crushing the breathing ceramsite to form granular filter material and performing screening to obtain the breathing ceramsite filter material.

[0047] Preferably, the component ratio of the slurry is: 25 - 45 parts of stone powder, 15 - 35 parts of quicklime powder, 5 - 15 parts of gypsum powder, 0.5 - 15 parts of foaming agent, 0.3 - 1 part of ceramic reinforcing agent, 6 - 12 parts of cement, and 2 - 5 parts of water.

[0048] Preferably, the preset temperature is 135 - 145 °C.

[0049] Preferably, the breathing ceramsite filter material meets at least one of the following characteristics,

[0050] The porosity of the breathing ceramsite filter material is 35 - 80%;

[0051] The aperture ratio of the breathing ceramsite filter material is 60 - 90%;

[0052] The particle size range of the breathing ceramsite filter material is 5 - 30 mm; the density after being saturated with water is 1020 - 1100 Kg / m 3 .

[0053] Compared with the prior art, the present application has the following obvious advantages:

[0054] 1. The present application combines a filter tank, a breathing ceramsite filter material tank, and MCR technology, which can effectively remove pollutants in water, and can also adapt to water sources with high turbidity, achieving advantages such as improving the impact resistance, reducing the fouling of the filter membrane, reducing investment and energy consumption, reducing the floor area, and improving the quality of the produced water;

[0055] 2. The membrane integrated water purification system adopts an upper and lower layer structure, reducing the floor area. By utilizing the water flow with a high elevation difference, it saves energy, reduces water flow fluctuations, and improves the effect of removing SS.

[0056] 3. The filter tank adopts bottom side - inlet, which is diagonal to the first overflow port, increasing the water flow distance and stability, and improving the efficiency of removing SS. The first filtration structure of the filter tank is provided with a filter media layer, an intermediate layer, and a support layer. Due to the weight difference between the first filtration structures, a relatively uniform air cushion layer is formed, and combined with the air - water washing method, it ensures uniform water and air distribution. Each layer does not mix and allows the combination of multiple layers of filter media. The washing is easy to achieve the best effect. The multi - layer filter media has a strong dirt - holding capacity, stable effluent water quality, a long washing cycle, and low energy consumption.

[0057] 4. The overflow water enters the breathing ceramsite filter tank through a water distributor, increasing the contact between water and air, improving the dissolved oxygen in water to increase the absorption of oxygen by breathing ceramsite, enhancing the biochemical effect, and thus greatly improving the removal rate of organic pollutants.

[0058] 5. The MCR process in the MCR membrane tank has the advantages of simple structure, easy operation, easy expansion, adding components, and lower energy consumption compared with traditional processes. The MCR membrane can remove almost all bacteria and SS in water, ensuring the quality of the produced water. In addition, a pulse aeration device is adopted, with large - pore pulse aeration for gas collection, large scouring and swinging, high decontamination efficiency, and energy savings.

[0059] 6. The breathing ceramsite filter media prepared in this application has a porous structure. Its density after being saturated with water is slightly higher than that of water, and it will float on the water surface during low - pressure water backwashing, improving the exchange of water and air in the open pores. Brief Description of the Drawings

[0060] Figure 1 is the front view of a membrane integrated water purification system of this application;

[0061] Figure 2 is the rear view of a membrane integrated water purification system of this application;

[0062] Figure 3 is the schematic structural diagram of the MCR membrane tank including 2 groups of membrane modules of this application;

[0063] Figure 4 is the schematic structural diagram of the MCR membrane tank including 1 group of membrane modules of this application;

[0064] Figure 5 is the plan view of the layer where the filtration system of this application is located;

[0065] Figure 6 is the plan view of the layer where the membrane system of this application is located.

[0066] Reference Signs:

[0067] 1 - First filtration structure, 2 - Second filtration structure, 3 - Air inlet, 4 - Water inlet, 5 - First overflow port, 6 - Water distributor, 7 - Water collection port, 8 - Vertical pipe, 9 - Water inlet, 10 - Discharge port, 11 - Second overflow port, 12 - Water outlet, 13 - Third overflow port, 14 - Discharge port, 15 - Membrane module, 16 - Pulsed aeration device. Detailed implementation mode

[0068] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0069] As used herein, the term "one embodiment" or "embodiment" refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present application. The content of the present application can be more easily understood by referring to the following detailed description of the preferred implementation methods of the present application and the included embodiments. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present application belongs. In case of conflict, the definition in this specification shall prevail.

[0070] For the purposes of the following detailed description, it should be understood that the present application may adopt various alternative variations and step sequences, unless otherwise expressly specified. In addition, except in any operating instance, or otherwise indicated, all numbers representing the amounts of ingredients used in the specification and claims should be understood to be modified in all instances by the term "about". Accordingly, unless otherwise indicated, the numerical parameters set forth in the following specification and attached claims are approximations that vary depending upon the desired properties sought to be obtained by the present application. At the very least, and not as an attempt to limit the application of the doctrine of equivalents to the scope of the claims, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.

[0071] Although the numerical ranges and parameters setting forth the broad scope of the present application are approximations, the numerical values set forth in the specific examples are reported as precisely as possible. However, any numerical value inherently contains certain errors necessarily resulting from the standard deviation found in their respective testing measurements.

[0072] When a numerical range is disclosed in this document, the above range is considered continuous and includes the minimum and maximum values of the range, as well as every value between such minimum and maximum values. Further, when the range refers to integers, every integer between the minimum and maximum values of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the ranges can be combined. In other words, unless otherwise specified, all ranges disclosed in this document should be understood to include any and all sub-ranges subsumed therein. For example, a specified range from "1 to 10" should be considered to include any and all sub-ranges between the minimum value 1 and the maximum value 10. Exemplary sub-ranges of the range 1 to 10 include, but are not limited to, 1 to 6.1, 3.5 to 7.8, 5.5 to 10, etc.

[0073] Before further elaborating on the embodiments of the present application, the nouns and terms involved in the embodiments of the present application are described. The nouns and terms involved in the embodiments of the present application are applicable to the following explanations.

[0074] MCR: Membrane Chemical Reactor or Membrane Coagulation Reactor.

[0075] The present application provides a membrane integrated water purification system. As shown in Figure 1-2 , it includes a filtration system and a membrane system that are interconnected. The filtration system includes a filter tank and a biological ceramsite filter media tank. The membrane system includes an MCR membrane tank, a product water tank, and a dosing device. Among them, the water outlet of the MCR membrane tank is connected to the water inlet of the product water tank, and the dosing device doses the product water tank; the present application combines a filter tank, a biological ceramsite filter media tank, and MCR technology, which can effectively remove pollutants in water, and can also adapt to water sources with high turbidity, achieving advantages such as improving the shock resistance ability, reducing the fouling of the filtration membrane, reducing investment and energy consumption, and improving the quality of the produced water. In addition, MCR can replace the traditional sand filtration + carbon filtration process, with better effluent, capable of filtering out bacteria, viruses, colloids, and small molecular weight particles, can be used at normal temperature, has reliable filtration performance, high precision, and can achieve the purpose of separation, concentration, and purification classification without dosing.

[0076] The filter tank includes a first filtration structure 1, a water inlet 4, an air inlet 3, and a first overflow port 5. The first filtration structure 1, the water inlet 4, and the air inlet 3 are arranged at the lower part of the filter tank, and the first overflow port 5 is arranged at the upper part of the filter tank. The first overflow port 5 is connected to the inlet of the biological ceramsite filter media tank; on the one hand, the water inlet 4 and the first overflow port 5 are arranged diagonally, increasing the water flow distance and stability, and improving the efficiency of removing SS; on the other hand, the water inlet 4 and the air inlet 3 at the lower part of the filter tank can form a way of air-water washing, increasing the contact and exchange time between water and air in the filtration structure 1.

[0077] Further, the filter tank is also provided with a discharge port 14 for discharging the water in the filter tank.

[0078] The breathing ceramsite filter tank includes a second filtration structure 2 and a water collection port 7. The water collection port 7 is arranged at the bottom of the second filtration structure 2 and is communicated with the water inlet 9 of the MCR membrane tank. Water flows through the second filtration structure 2, and suspended matters with smaller particle sizes can be intercepted, providing better influent water quality for the membrane tank.

[0079] In some embodiments, the water collection port 7 is communicated with the backwashing water inlet. When the integrated membrane water purification system stops being used, the water discharged from the water production tank is pumped into the backwashing water inlet from the water pump, and water enters the water collection port 7 to clean the second filtration structure 2.

[0080] In some embodiments, an integrated membrane water purification system of the present application includes at least two layers of structures. The layer where the filtration system is located is arranged above the layer where the membrane system is located, which can further reduce the floor area of the system. Moreover, the water flow with a high head difference can be utilized to save energy, reduce water flow fluctuations, and improve the SS removal effect.

[0081] Furthermore, a support plate is provided at the bottom of the first filtration structure 1. The height of the support plate near the breathing ceramsite filter tank is higher than the height away from the breathing ceramsite filter tank. The formed height difference makes the support plate form a slope of 3 - 15° at the bottom of the first filtration structure, reducing the resistance when water enters the filter tank and increasing the contact area between the water in the filter tank and the first filtration structure 1.

[0082] Specifically, the slope of the support plate can be 3, 6, 7, 8, 9, 10, 12, 13, 15°.

[0083] In some embodiments, the first filtration structure 1 is placed on the support plate and is provided with a filter media layer, an intermediate layer, and a support layer from top to bottom. The filter media layer includes quartz sand; the intermediate layer includes fine cobblestones with a diameter of 5 - 10 mm; the support layer includes coarse cobblestones with a diameter of 20 - 30 mm. Due to the weight difference, a relatively uniform air cushion layer is formed among the layers, thus ensuring more uniform water and gas distribution. In addition, the combination of multiple layers of filter media has a longer flushing cycle and is easier to achieve the best flushing effect on the one hand; on the other hand, the multiple layers of filter media have a strong dirt-holding capacity, stable effluent water quality, and lower energy consumption.

[0084] In some embodiments, the bottom of the second filtration structure 2 is inclined and supported with both ends high and the middle low. The two ends of the inclined support are respectively arranged on the side walls on both sides of the breathing ceramsite filter tank. The lowest part of the inclined support is communicated with the water collection port 7, and the water collection port 7 is communicated with the water inlet 9 of the MCR membrane tank. The inclined support has a stronger load-bearing capacity and can also play a role in converging water flow. Specifically, the inclination range of the two ends of the inclined support to the lowest part is 3 - 15°. Specifically, the slopes of the two ends of the inclined support can be 3, 6, 7, 8, 9, 10, 12, 13, 15°.

[0085] In some embodiments, the support plate and / or the inclined support are provided with air holes for enhancing the contact and exchange of water and air in the filter tank by realizing the contact between water flow and air flow.

[0086] The second filtration structure 2 further includes a breathing ceramsite filter medium placed on the inclined support. The breathing ceramsite filter medium has better permeability, better hardness, rough surface, many micropores, high porosity, large specific surface area, low energy consumption for water washing, and small head loss, etc., and is used to intercept most of the suspended matters with smaller particle sizes. Specifically, the filling degree of the breathing ceramsite filter medium in the second filtration structure is 35-60%, the porosity of the breathing ceramsite filter medium is 35-80%, the particle size range of the breathing ceramsite filter medium is 5-30 mm, and the density of the breathing ceramsite filter medium after being saturated with water is 1020-1100 Kg / m 3 . The density of the breathing ceramsite after being saturated with water is slightly higher than that of water, and it will float to the water surface during low-pressure water backwashing, improving the exchange efficiency of water and air in the breathing ceramsite filter medium.

[0087] Furthermore, at the bottom of the second filtration structure 2, that is, above the inclined support, cobblestones can also be used as the support layer, which is more convenient for the second filtration structure 2 to discharge water.

[0088] Furthermore, one end of a water distributor 6 is provided at the entrance of the breathing ceramsite filter medium tank and is communicated with the first overflow port 5. The overflow water flows from the first overflow port 5 into the water distributor 6. The overflow water enters the breathing ceramsite filter medium tank through the water distributor 6, increasing the contact between water and air, improving the dissolved oxygen of water to increase the absorption of oxygen by the breathing ceramsite, improving the biochemical effect, and thus greatly improving the removal rate of organic pollutants. The water distributor 6 is composed of at least one inverted cone groove, and there is a water outlet hole at the bottom of the inverted cone groove. Specifically, 2-5 inverted cone grooves can be arranged in the water distributor 6.

[0089] In some embodiments, the water collecting port 7 is communicated with the water inlet 9 of the MCR membrane tank through a vertical pipe 8. The MCR membrane tank includes a suction system, a pulsed aeration device 16, and at least one group of membrane modules 15. The pulsed aeration device 16 is provided at the bottom of the membrane module 15 for flushing the surface of the membrane filaments of the membrane module to clean the membrane by causing the membrane filaments to swing and the pollution particles to peel off. A water production port is provided above the membrane module 15, and the water production port is communicated with the water production tank. The membrane module 15 is plugged with the pulsed aeration device 16 by a quick plug-in installation method, which can be easily disassembled, maintained, and replaced. The suction system is connected to the membrane module 15 for sucking the gas and / or water in the membrane module 15.

[0090] Specifically, the membrane module 15 includes hollow fiber membrane filaments and a water collection device. The hollow fiber membrane filaments can produce high-quality filtered water. The membrane module contains thousands of PVDF hollow fiber membrane filaments. The two ends of the membrane filaments are sealed with epoxy resin and polyurethane. The sealing structures at the upper and lower ends form the upper and lower ends for the membrane filaments to filter and discharge water. The upper and lower ends are respectively connected to the water collection device, or any one of the upper and lower ends is connected to the water collection device, enabling the inner cavity of the hollow structure of the membrane filaments to communicate with one end of the water collection device. The other end of the water collection device is also provided with a water production port, which is communicated with the water production pool.

[0091] In some embodiments, as Figure 3-4 shown, one set or two or more sets of membrane modules 15 can be arranged in the MCR membrane tank.

[0092] Furthermore, the MCR membrane tank is also provided with a suction system. The suction system enables the air-water mixture to flow upward in the membrane tank, generating cross-flow on the membrane surface. The cross-flow continuously flushes the membrane surface, preventing the deposition of solid particles on the membrane surface. The filtered permeate is collected from the inside of the hollow fiber membrane by a suction pump and conveyed to the water collection pipe, and then transported to the water production pool. The water impurities are all intercepted in the membrane tank, and the concentrated turbid liquid is continuously or periodically discharged from the discharge port 10 of the membrane tank. The entire treatment process can be controlled by a PLC and operated automatically.

[0093] Furthermore, the MCR membrane tank is also provided with a second overflow port 11.

[0094] In some embodiments, after the permeate enters the water production pool, it is sterilized by the sodium hypochlorite solution in the chemical dosing device to generate the produced water, which is discharged from the water outlet 12 at the lower part of the water production pool.

[0095] Equipment such as the chemical dosing device of the water production pool and the aeration fan of the pulse aeration device 16 can be arranged in the equipment room on the floor where the membrane system is located.

[0096] Furthermore, a third overflow port 13 is also provided at the upper part of the water production pool to ensure that the liquid level in the water production pool is maintained within a suitable range.

[0097] The above-mentioned membrane integrated water purification system of the present application integrates and optimizes technologies such as an overflow filter tank, filtration and impurity removal by a breathing ceramsite filter material tank, air-water combined flushing, and membrane water treatment, greatly improving the water output capacity of the integrated water purification equipment, extending the water output cycle, enhancing the shock resistance, solving the problem of filter head blockage, reducing investment and energy consumption, decreasing the floor area, and improving the water quality of the produced water.

[0098] The present application also provides a method for using the above-mentioned membrane integrated water purification system, including the following steps:

[0099] S1: Filter bed filtration: Air is purged from the air inlet 3 into the filter bed. At the same time, water flows into the bottom of the filter bed from the water inlet 4. The water is filtered by the first filtration structure 1 of the filter bed and overflows upward from the bottom to form overflow water. The overflow water enters the breathing ceramsite filter material pool from the first overflow port 5;

[0100] S2: Breathing ceramsite filter material pool filtration: After the overflow water enters the breathing ceramsite filter material pool, it is filtered by the second filtration structure 2 and then flows out from the water collecting port 7 at the bottom of the breathing ceramsite filter material pool. The water then enters the MCR membrane pool;

[0101] S3: After the water passes through the filtration of the MCR membrane pool, permeate is generated. The permeate is transported from the water production port of the MCR membrane pool to the water production pool;

[0102] S4: The permeate is sterilized by the sodium hypochlorite solution in the dosing device in the water production pool to generate product water, and the product water is discharged from the water outlet 12 of the water production pool.

[0103] Specifically, the quality of the product water is turbidity ≤ 0.1 NTU, COD ≤ 1 mg / L, total number of colonies ≤ 5 MPN / ml, and Escherichia coli not detected. In some embodiments, the water production pool is equipped with a detection instrument for monitoring the water quality of the water discharged from the water production pool.

[0104] In some embodiments, the air flow rate in the filter bed is 300 - 650 m 3 / h, and the water inflow rate of the filter bed is 62 - 72 T / h; specifically, it can be 62, 65, 68, 70, 72 T / h

[0105] The water inflow rate of the MCR membrane pool is 62 - 70 T / h, specifically, it can be 62, 65, 68, 70 T / h;

[0106] The water inflow rate of the water production pool is 62 - 65 T / h, the dosing amount of the sodium hypochlorite solution is 10 - 15 Kg / h, and the weight percentage content of sodium hypochlorite in the sodium hypochlorite solution in the dosing device is 0.3 - 10%; specifically, the weight percentage content of sodium hypochlorite can be 0.3, 0.5, 0.7, 1, 3, 5, 8, 9, 10%

[0107] This application also provides a preparation method of the breathing ceramsite filter material. The prepared breathing ceramsite filter material is used for filtering water in the above-mentioned breathing ceramsite filter material pool. The preparation method includes the following steps:

[0108] S1: Provide raw materials and mix them to form a slurry. The raw materials include stone powder, quicklime powder, gypsum powder, foaming agent, ceramic reinforcing agent, cement and water;

[0109] S2: Foam and shape the slurry at a preset temperature to form breathing ceramsite; specifically, the preset temperature is 135 - 145 °C;

[0110] S3: Crush the breathing ceramic material to form granular filter media, and perform screening to obtain the breathing ceramsite filter media.

[0111] In some embodiments, the component ratio of the slurry is as follows: 25 - 45 parts of stone powder, 15 - 35 parts of quicklime powder, 5 - 15 parts of gypsum powder, 0.5 - 15 parts of foaming agent, 0.3 - 1 part of ceramic strengthening agent, 6 - 12 parts of cement, and 2 - 5 parts of water.

[0112] In some embodiments, the porosity of the breathing ceramsite filter media prepared in this application is 35 - 80%, the open porosity is 60 - 90%, and the particle size range of the breathing ceramsite filter media is 5 - 30 mm.

[0113] The following lists the preferred embodiments of this application for further describing the preparation method of the breathing ceramsite filter media of this application.

[0114] Preparation Example 1

[0115] S1: Provide 45 parts of stone powder, 25 parts of quicklime powder, 12 parts of gypsum powder, 5 parts of foaming agent AC1300, 0.5 part of ceramic strengthening agent FG - 253, 9 parts of cement, and 3.5 parts of water, and mix them to form a slurry.

[0116] S2: Foam the slurry at 140 °C for 6 minutes for shaping to form the breathing ceramic material;

[0117] S3: Crush the breathing ceramic material to form granular filter media, perform screening, and the obtained breathing ceramsite filter media has a porosity of 52%, an open porosity of 62%, and a particle size range of 10 - 12 mm. The density after water absorption saturation is 1030 Kg / m 3 .

[0118] Preparation Example 2

[0119] S1: Provide 40 parts of stone powder, 27 parts of quicklime powder, 15 parts of gypsum powder, 3 parts of foaming agent AC1300, 0.7 part of ceramic strengthening agent FG - 253, 10 parts of cement, and 4.2 parts of water, and mix them to form a slurry.

[0120] S2: Foam the slurry at 135 °C for 25 minutes for shaping to form the breathing ceramic material;

[0121] S3: Crush the breathing ceramic material to form granular filter media, perform screening, and the obtained breathing ceramsite filter media has a porosity of 69%, an open porosity of 70%, and a particle size range of 11 - 16 mm. The density after water absorption saturation is 1080 Kg / m 3

[0122] Preparation Example 3

[0123] S1: Provide 29 parts of stone powder, 35 parts of quicklime powder, 6 parts of gypsum powder, 15 parts of foaming agent AC1300, 1 part of ceramic reinforcing agent FG-253, 9 parts of cement and 5 parts of water, and mix them to form a slurry.

[0124] S2: Foam the slurry at 145 °C for 7 minutes for shaping to form breathing ceramic material.

[0125] S3: Crush the breathing ceramic material to form granular filter media, and perform screening. The obtained breathing ceramsite filter media has a porosity of 78% and an opening ratio of 85%. The particle size range of the breathing ceramsite filter media is 15 - 20 mm. The density after being saturated with water is 1100 Kg / m 3 .

[0126] The breathing ceramsite filter media prepared in this application has a porous structure. Its density after being saturated with water is slightly higher than that of water, and it will float to the water surface during low-pressure water backwashing, improving the exchange of water and air in the open pores. The porous structure is spherical or spherical-connected formed by the foaming agent, and is distributed in the ceramsite in a foaming manner, making the breathing ceramsite similar to semi-rigid foam sponge and improving the breathing effect of the breathing ceramsite.

[0127] The following lists the preferred embodiments of this application for further describing the usage method of a membrane integrated water purification system.

[0128] Example 1

[0129] S1: Filtration in the filter tank: Air is purged into the filter tank from the air inlet 3 at a flow rate of 450 m 3 / h, and water flows into the bottom of the filter tank from the water inlet 4 at a flow rate of 62 T / h. The water flow is filtered by the first filtration structure 1 of the filter tank. The first filtration structure 1 is successively provided with a quartz sand filter media layer, a fine cobblestone intermediate layer with a diameter of 5 - 7 mm, and a coarse cobblestone support layer with a diameter of 20 - 25 mm from top to bottom. There is a support plate with an angle of 10 degrees at the bottom surface of the coarse cobblestone support layer. The water flow filters upward from the bottom water inlet 4 to form overflow water, and the overflow water enters the breathing ceramsite filter media tank from the first overflow port 5.

[0130] S2: Filtration in the breathing ceramsite filter media tank: The overflow water enters the water distributor of the breathing ceramsite filter media tank. The water distributor is provided with 3 groups of inverted cone grooves, and there are several water outlet holes at the bottom of each inverted cone groove. The overflow water flows out from the water outlet holes and is filtered by the second filtration structure 2, and then flows out from the water collecting port 7 at the bottom of the second filtration structure 2. The water flow enters the MCR membrane tank. The inclination angles from the lowest point to both ends of the inclined support of the second filtration structure 2 are 6 degrees respectively. Cobblestones are placed on the inclined support as a support layer, and breathing ceramsite filter media is laid above the cobblestones. The breathing ceramsite filter media has a pore diameter of 0.5 - 2 mm to facilitate the exchange of water and air in the pores. The opening ratio of the breathing ceramsite is 60 - 70%, and the filling degree is 50%. The corresponding bulk density is 400 - 500 Kg / m3 and the density after being saturated with water is 1020 - 1030 Kg / m 3 , the density after being saturated with water is slightly higher than that of water, and it can be backwashed with low-pressure water, with low energy consumption. Moreover, the ceramsite will float on the water surface during backwashing, improving the exchange of water and air in the open pores.

[0131] S3: After the water flow passes through the breathing ceramsite filter bed and is filtered, it enters the MCR membrane tank at a water inflow rate of 65 T / h. A suction system is designed in the MCR membrane tank to suck the gas in the membrane module, so that the gas-liquid mixture in the membrane module flows upward in the membrane tank, generating cross-flow on the membrane surface. The cross-flow continuously flushes the membrane surface. The permeate generated by the water flow passing through the membrane is collected inside the hollow fiber membrane and flows to the water collection device through the suction system, and is transported to the water production tank through the water production port at the end of the water collection device. When the MCR membrane tank operates, the pulse aeration device 16 is used for long-term aeration.

[0132] S4: The permeate is sterilized by adding sodium hypochlorite solution in the dosing device at a rate of 10 Kg / h in the water production tank to generate the produced water. The content of sodium hypochlorite in the sodium hypochlorite solution is 9%. The produced water flows out from the water outlet 12 of the water production tank. The quality of the produced water is turbidity of 0.1 NTU, COD of 1 mg / L, no detected Escherichia coli, and total coliforms of 5 MPN / ml.

[0133] Example 2

[0134] S1: Filter bed filtration: Air is blown into the filter bed through the air inlet 3 at a flow rate of 650 m 3 / h, and the water flow flows into the bottom of the filter bed from the water inlet 4 at a flow rate of 70 T / h. The water flow passes through the first filtration structure 1 of the filter bed. The first filtration structure 1 is successively provided with a quartz sand filter layer, a middle layer of fine cobblestones with a diameter of 8 - 10 mm, and a supporting layer of coarse cobblestones with a diameter of 25 - 30 mm from top to bottom. There is a support plate with an angle of 7 degrees at the bottom surface of the coarse cobblestone supporting layer. The water flow is filtered upward from the bottom water inlet 4 to form overflow water, and the overflow water enters the breathing ceramsite filter bed from the first overflow port 5;

[0135] S2: Breathing ceramsite filter bed filtration: The overflow water enters the water distributor of the breathing ceramsite filter bed. The water distributor is provided with 3 groups of inverted cone grooves, and there are several water outlet holes at the bottom of each inverted cone groove. The overflow water flows out from the water outlet holes and is filtered by the second filtration structure 2, and then flows out from the water collection port 7 at the bottom of the second filtration structure 2, and the water flow enters the MCR membrane tank; The inclination angle from the lowest point to both ends of the inclined support of the second filtration structure 2 is 11 degrees. Cobblestones are placed on the inclined support as a supporting layer, and breathing ceramsite filter materials are laid above the cobblestones. The breathing ceramsite filter materials have a pore diameter of 0.5 - 2 mm, which is convenient for the exchange of water and air in the pores; The porosity of the breathing ceramsite is 70 - 75%, the filling degree is 60%, and the corresponding bulk density is 500 - 600 Kg / m 3, the density after being saturated with water is 1030 - 1050 Kg / m 3 , slightly higher than water, it can be backwashed with low-pressure water, with low energy consumption, and the ceramsite will float to the surface during backwashing, improving the exchange of water and air in the open pores.

[0136] S3: After the water flow passes through the breathing ceramsite filter pool, it enters the MCR membrane pool at a water inflow rate of 70 T / hour. A suction system is designed in the MCR membrane pool to suck the gas in the membrane module, so that the gas-liquid mixture in the membrane module flows upward in the membrane pool, generating a cross-flow on the membrane surface. The cross-flow continuously flushes the membrane surface. The permeate generated by the water flow passing through the membrane is collected inside the hollow fiber membrane by the suction system and flows to the water collection device, and is transported to the product water pool through the water production port at the end of the water collection device. When the MCR membrane pool operates, the pulse aeration device 16 is used for long-term aeration.

[0137] S4: The permeate is sterilized by adding sodium hypochlorite solution in the dosing device at a rate of 10 Kg / hour in the product water pool to generate product water. The content of sodium hypochlorite in the sodium hypochlorite solution is 10%. The product water flows out from the water outlet 12 of the product water pool. The quality of the product water is turbidity of 0.08 NTU, COD of 0.9 mg / L, no Escherichia coli detected, and total coliforms of 5 MPN / ml.

[0138] Example 3

[0139] S1: Filter pool filtration: Air is blown into the filter pool from the air inlet 3 at a flow rate of 450 m 3 / hour, and the water flow flows into the bottom of the filter pool from the water inlet 4 at a flow rate of 62 T / hour. The water flow passes through the first filtration structure 1 of the filter pool. The first filtration structure 1 is successively provided with a quartz sand filter layer, a fine cobblestone intermediate layer with a diameter of 5 - 7 mm, and a coarse cobblestone support layer with a diameter of 20 - 25 mm from top to bottom. There is a support plate with an angle of 10 degrees at the bottom surface of the coarse cobblestone support layer. The water flow filters upward from the bottom water inlet 4 to form overflow water, and the overflow water enters the breathing ceramsite filter pool from the first overflow port 5;

[0140] S2: Breathing ceramsite filter pool filtration: The overflow water enters the water distributor of the breathing ceramsite filter pool. The water distributor is provided with 3 groups of inverted cone grooves, and there are several water outlet holes at the bottom of each inverted cone groove. The overflow water flows out from the water outlet holes and is filtered by the second filtration structure 2, and then flows out from the water collection port 7 at the bottom of the second filtration structure 2, and the water flow enters the MCR membrane pool; The inclination angle from the lowest point to both ends of the inclined support of the second filtration structure 2 is 15 degrees. Cobblestones are placed on the inclined support as a support layer, and breathing ceramsite filter materials are laid above the cobblestones. The breathing ceramsite filter materials have a pore diameter of 0.5 - 2 mm to facilitate the exchange of water and air in the pores; The porosity of the breathing ceramsite is 60 - 90%, the filling degree is 50%, and the corresponding bulk density is 300 - 800 Kg / m 3, the density after being saturated with water is 1020 - 1030 Kg / m 3 , the density after being saturated with water is slightly higher than that of water, and it can be backwashed with low-pressure water, with low energy consumption. Moreover, the ceramsite will float to the water surface during backwashing, improving the exchange of water and air in the open pores.

[0141] S3: After the water flow passes through the breathing ceramsite filter bed, it enters the MCR membrane tank at a water inflow rate of 65 T / h. A suction system is designed in the MCR membrane tank to suck the gas in the membrane module, so that the gas-liquid mixture in the membrane module flows upward in the membrane tank, generating a cross-flow on the membrane surface. The cross-flow continuously flushes the membrane surface. The permeate generated by the water flow passing through the membrane permeates through the suction system and converges inside the hollow fiber membrane to the water collection device, and is transported to the product water tank through the product water outlet at the end of the water collection device. When the MCR membrane tank operates, the pulse aeration device 16 is used for long-term aeration.

[0142] S4: The permeate is sterilized by adding sodium hypochlorite solution in the dosing device at 10 Kg / h in the product water tank to generate product water. The sodium hypochlorite content in the sodium hypochlorite solution is 9.5%. The product water flows out from the outlet 12 of the product water tank. The quality of the product water is that the turbidity is 0.1 NTU, the COD is 1 mg / L, the number of Escherichia coli is not detected, and the total number of colonies is 5 MPN / ml.

[0143] The above is only the specific implementation manner of this application, but the design concept of this application is not limited thereto. Any non-substantive modification made to this application using this concept shall belong to the act of infringing the protection scope of this application.

Claims

1. An integrated membrane water purification system, characterized in that, It includes a mutually connected filtration system and membrane system. The filtration system includes a filter tank and a biological ceramsite filter media tank, and the membrane system includes an MCR membrane tank, a water production tank, and a chemical dosing device. The filter tank includes a first filtration structure (1), a water inlet (4), an air inlet (3), and a first overflow port (5). The first filtration structure (1), the water inlet (4), and the air inlet (3) are arranged at the lower part of the filter tank, and the first overflow port (5) is arranged at the upper part of the filter tank. The first overflow port (5) is communicated with the inlet of the biological ceramsite filter media tank. The biological ceramsite filter media tank includes a second filtration structure (2) and a water collection port (7). The water collection port (7) is arranged at the bottom of the second filtration structure (2), and the water collection port (7) is communicated with the water inlet (9) of the MCR membrane tank. The water production port of the MCR membrane tank is communicated with the water inlet of the water production tank, and the chemical dosing device doses the water production tank.

2. The integrated membrane water purification system according to claim 1, characterized in that The membrane integrated water purification system includes at least two layers of structures, and the layer where the filtration system is located is arranged above the layer where the membrane system is located.

3. The integrated membrane water purification system according to claim 1, characterized in that, The second filtration structure (2) includes biological ceramsite filter media, and the biological ceramsite filter media satisfies at least one of the following characteristics: The filling degree of the biological ceramsite filter media in the second filtration structure (2) is 35 - 60%; The porosity of the biological ceramsite filter media is 35 - 80%; The particle size range of the biological ceramsite filter media is 5 - 30 mm; The density of the biological ceramsite filter media after being saturated with water is 1020 - 1100 Kg / m3.

4. The integrated membrane water purification system according to claim 1, characterized in that A support plate is provided at the bottom of the first filtration structure (1). The height of the support plate near the biological ceramsite filter media tank is higher than the height away from the biological ceramsite filter media tank, and the angle formed by the height difference is 3 - 15°.

5. The integrated membrane water purification system according to claim 4, characterized in that, The first filtration structure (1) is successively provided with a filter media layer, an intermediate layer, and a support layer from top to bottom. The support layer is placed on the support plate. The first filtration structure (1) satisfies at least one of the following characteristics: The filter media layer includes quartz sand; The intermediate layer includes fine cobblestones; The diameter of the fine cobblestones is 5 - 10 mm; The support layer includes coarse cobblestones; The diameter of the coarse cobblestones is 20 - 30 mm.

6. The integrated membrane water purification system according to claim 1, wherein The bottom of the second filtration structure (2) is inclined and supported with both ends high and the middle low. The inclined support is used to support the biological ceramsite filter media. The lowest part of the inclined support is communicated with the water collection port (7), and the water collection port (7) is communicated with the water inlet (9) of the MCR membrane tank.

7. The integrated membrane water purification system according to claim 6, wherein The water collection port (7) is communicated with the water inlet (9) of the MCR membrane tank through a vertical pipe (8).

8. The integrated membrane water purification system according to claim 1, wherein A water distributor (6) is provided at the inlet of the biological ceramsite filter media tank. The water distributor (6) is composed of at least one inverted cone groove, and there are water outlet holes at the bottom of the inverted cone groove.

9. The integrated membrane water purification system according to any one of claims 1 to 9, characterized in that The MCR membrane tank includes a suction system, a pulsed aeration device (16), and at least one group of membrane modules (15). The pulsed aeration device (16) is arranged below the membrane modules (15), and the suction system is used to suck the gas and / or water in the membrane modules (15).

10. The integrated membrane water purification system according to claim 9, characterized in that, The MCR membrane tank satisfies at least one of the following characteristics: The membrane module (15) is detachably plugged and installed in the MCR membrane tank; The membrane module (15) includes hollow fiber membrane filaments. The two ends of the hollow fiber membrane filaments are respectively the upper end and the lower end for filtered water outlet. At least one end of the upper end and the lower end for filtered water outlet is connected to a water collecting device, and a water production port is provided on the water collecting device.

11. A method for using an integrated membrane water purification system, characterized in that, Using a membrane integrated water purification system according to any one of claims 1 to 10, comprising the following steps: S1: Filtering in the filter tank: Air is purged into the filter tank from the air inlet (3), water flows into the bottom of the filter tank from the water inlet (4), the water is filtered by the first filtering structure (1) of the filter tank, overflows from the bottom upwards to form overflow water, and the overflow water enters the breathing ceramsite filter tank from the first overflow port (5); S2: Filtering in the breathing ceramsite filter tank: After the overflow water enters the breathing ceramsite filter tank, it is filtered by the second filtering structure (2), then flows out from the water collecting port (7), and the water flows into the MCR membrane tank; S3: After the water is filtered by the MCR membrane tank, a permeate is generated, and the permeate is transported from the water production port of the MCR membrane tank to the water production tank; S4: The permeate is treated with sodium hypochlorite solution in the dosing device in the water production tank to generate produced water, and the produced water is discharged from the water outlet (12) of the water production tank.

12. The method of using an integrated membrane water purification system according to claim 11, characterized in that, The usage method satisfies at least one of the following characteristics: The flow rate of the air is 300 - 650 m3 / hour; The water inflow of the filter tank is 62 - 72 T / hour; The water inflow of the MCR membrane tank is 62 - 70 T / hour; The water inflow of the water production tank is 62 - 65 T / hour; The dosing amount of the sodium hypochlorite solution is 10 - 15 Kg / hour; The sodium hypochlorite content in the sodium hypochlorite solution is 0.3 - 10%.

13. The method for using an integrated membrane water purification system according to claim 11, characterized in that, The quality of the produced water satisfies at least one of the following characteristics: Turbidity ≤ 0.1 NTU; COD ≤ 1 mg / L; Total number of colonies ≤ 5 MPN / ml.

14. A preparation method of a breathing ceramsite filter material, characterized in that, The preparation method includes the following steps: S1: Providing raw materials and mixing them to form a slurry. The raw materials include stone powder, quicklime powder, gypsum powder, foaming agent, ceramic reinforcing agent, cement and water; S2: Foaming and shaping the slurry at a preset temperature to form breathing ceramsite; S3: Crushing the breathing ceramsite to form granular filter media, and screening to obtain the breathing ceramsite filter media.

15. A preparation method of a breathing ceramsite filter material according to claim 14, characterized in that, The component ratio of the slurry is: 25 - 45 parts of stone powder, 15 - 35 parts of quicklime powder, 5 - 15 parts of gypsum powder, 0.5 - 15 parts of foaming agent, 0.3 - 1 part of ceramic reinforcing agent, 6 - 12 parts of cement and 2 - 5 parts of water.

16. A method for preparing a breathing ceramsite filter material according to claim 14, characterized in that, The breathing ceramsite filter media satisfies at least one of the following characteristics: The porosity of the breathing ceramsite filter media is 35 - 80%; The aperture ratio of the breathing ceramsite filter media is 60 - 90%; The particle size range of the breathing ceramsite filter media is 5 - 30 mm; The density after being saturated with water absorption is 1020 - 1100 Kg / m3.

Images