Coagulation coupling ceramic membrane water treatment device

Abstract

The utility model discloses a coagulation coupling ceramic membrane water treatment device which comprises a stirring tank, an inlet of the stirring tank is connected with a water inlet pipe, and a coagulant adding device and a coagulant aid adding device are sequentially installed on the water inlet pipe in the water inlet direction; an inlet of the ceramic membrane filtering device is connected with an outlet of the stirring tank through a pipeline. According to the device, an inorganic coagulant and an organic coagulant aid are sequentially added into water through the coagulant adding device and the coagulant aid adding device and then are mixed and stirred in the stirring tank, so that floc grows and enters the ceramic membrane device, and a fluffy filter cake layer is formed on the surface of a ceramic membrane, so that the water quality can be filtered to improve the quality of produced water; and ceramic membrane holes can be prevented from being blocked, so that the operation flux is improved, and the CEB maintenance cleaning period is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, and more specifically to a coagulation-coupled ceramic membrane water treatment device. Background Art

[0002] In recent years, ceramic membranes have been increasingly valued in the field of water treatment. The advantages of ceramic membranes are high mechanical strength, long life, resistance to oil, acid and alkali, and high temperature, but the disadvantage is high cost, which is more than 10 times that of organic membranes. If the investment cost of ceramic membranes cannot be greatly reduced, it will be difficult for ceramic membranes to be widely promoted and used. There are two ways to reduce the investment in ceramic membrane equipment. One is to reduce the production cost of ceramic membranes, and the other is to increase the water flux of ceramic membranes. The main method to reduce the production cost of ceramic membranes is to reduce the cost of raw materials and the sintering temperature to reduce fuel costs, but the risks brought by this method will shorten the life of the ceramic membrane and reduce the acid and alkali resistance, affecting product quality. Simply increasing the water flux of ceramic membranes will make the ceramic membrane pores easy to clog, and the ceramic membrane equipment will be cleaned frequently.

[0003] Therefore, how to provide a coagulation-coupled ceramic membrane water treatment device that can significantly increase the water production flux per unit area of ​​the ceramic membrane and extend the cleaning cycle of the ceramic membrane is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0004] In view of this, the utility model provides a coagulation-coupled ceramic membrane water treatment device which can greatly improve the water production flux per unit area of ​​the ceramic membrane and extend the cleaning cycle of the ceramic membrane.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A coagulation-coupled ceramic membrane water treatment device, comprising:

[0007] A stirring tank, wherein the inlet of the stirring tank is connected to a water inlet pipe, and a coagulant adding device and a coagulant aid adding device are sequentially installed on the water inlet pipe along the water inlet direction;

[0008] A ceramic membrane filtration device, wherein the inlet of the ceramic membrane filtration device is connected to the outlet of the stirring tank through a pipeline.

[0009] It can be seen from the above technical scheme that compared with the prior art, the utility model discloses a coagulation-coupled ceramic membrane water treatment device, which adds inorganic coagulants and organic coagulants to water in sequence through a coagulant adding device and a coagulant aid adding device, and then mixes and stirs them in a stirring tank to make the flocs grow and enter the ceramic membrane device to form a fluffy filter cake layer on the surface of the ceramic membrane, which can not only filter the water quality to improve the water quality, but also prevent the ceramic membrane pores from being blocked, thereby improving the operating flux and extending the CEB maintenance cleaning cycle.

[0010] Furthermore, the mixing tank is made of one of carbon steel, stainless steel, duplex steel, titanium alloy metal materials and metal anti-corrosion materials, or one of fiberglass, PVC and polypropylene non-metallic materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the utility model 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 in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0012] Figure 1 This is a structural schematic diagram of a coagulation-coupled ceramic membrane water treatment device provided by the utility model. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] like Figure 1 As shown, the embodiment of the utility model discloses a coagulation-coupled ceramic membrane water treatment device, comprising:

[0015] A stirring tank 1, the inlet of the stirring tank 1 is connected to a water inlet pipe 2, and a coagulant adding device 3 and a coagulant aid adding device 4 are sequentially installed on the water inlet pipe 2 along the water inlet direction;

[0016] A ceramic membrane filtration device 5 , the inlet of which is connected to the outlet of the stirring tank 1 through a pipeline 6 .

[0017] The device combines coagulants, coagulant aids, stirring tanks and ceramic membranes to flocculate colloids, microorganisms and other pollutants in the water through the flocculation of coagulants and further sweeping and capturing of coagulants. The pollutants grow in the stirring tank to form large floccules, which flow to the surface of the ceramic membrane to form a fluffy filter cake layer, preventing small particles from entering the filter membrane pores of the ceramic membrane and clogging the ceramic membrane. While protecting the ceramic membrane pores from being blocked, the water can also be further filtered through the filter cake layer, thereby improving the water quality of the ceramic membrane's produced water, increasing the operating flux of the ceramic membrane, and extending the cleaning cycle of the ceramic membrane.

[0018] Furthermore, the coagulant of the coagulant adding device is an inorganic coagulant, including aluminum coagulants such as polyaluminium chloride and aluminium sulfate, or iron coagulants such as ferric sulfate, ferrous sulfate, ferric chloride, polyferric sulfate, polyferric chloride, and inorganic coagulants of aluminium-iron combination, and the addition amount is 0.5-20ppm. In this way, after the inorganic coagulant is added to the water, the pollutants such as colloids and microorganisms in the water will be neutralized and unstable due to charge neutralization, so that small particles will agglomerate into large particles.

[0019] Furthermore, the coagulant of the coagulant adding device is an organic polymer flocculant, including PAM, ST, PDMDAAC, DAM-ECH and other polymer flocculants, and the added amount is 0.01-5ppm. In this way, the alum flowers formed in the water are further grown and fluffy through the netting and sweeping action of the organic polymer flocculant.

[0020] Furthermore, the material of the stirring tank 1 is one of carbon steel, stainless steel, duplex steel, titanium alloy metal material and metal anti-corrosion material, or one of glass fiber reinforced plastic, PVC, polypropylene non-metallic material, the number is one or more in parallel or in series, the operating pressure is 0.05-0.5MPa, and the residence time is 10-200 seconds. In this way, through the mixing and stirring action of the stirring tank, the flocs in the water can react more fully and thoroughly, providing time and collision opportunities for the growth of the flocs.

[0021] Furthermore, the ceramic membrane of the ceramic membrane filtration device can be a ceramic microfiltration, ceramic ultrafiltration or ceramic nanofiltration membrane, and the material can be alumina, zirconium oxide, titanium oxide, silicon carbide, cordierite, etc., or two or more composite materials of the above materials, and the form can be tubular, flat, plate, hollow fiber, disc, disc, etc.

[0022] Furthermore, a booster pump may be provided on the pipeline 2 to increase the operating pressure of the system. Of course, the booster pump may be installed before the dosing point of the coagulant adding device 3 or after the dosing point of the coagulant adding device 3 .

[0023] Embodiment 1:

[0024] 1) Incoming water flows into the stirring tank 1 from the water inlet pipe 2, and inorganic flocculants and organic flocculants are added in the pipeline in front of the stirring tank 1 through the coagulant adding device 3 and the coagulant adding device 4 in turn. After being mixed through the water inlet pipe, they enter the stirring tank 1. After being stirred and mixed in the stirring tank 1, the flocs further grow, and then enter the ceramic membrane filter device 5 through the pipeline 6. The ceramic membrane filter device 5 adopts dead-end filtration during operation. In this embodiment, the raw water is selected from the treated Yellow River water, and the parameters are: turbidity 0.5NTU, PH8.2, and the membrane element of the ceramic membrane filter device 5 is an existing product, model CM-122, pore size 30nm, area 28㎡, and material is zirconium aluminum composite material.

[0025] 2) The incoming water supply adopts constant flow control. After 2 hours of operation, the operating flux is stable at 265LMH, the transmembrane pressure difference is 0.05MPa, and the SDI value of the produced water is 1.53. After 33 days of operation, the transmembrane pressure difference increases to 0.15MPa. After maintenance cleaning (CEB), the transmembrane pressure difference recovers to 0.05MPa.

[0026] Comparative Example 1:

[0027] The same as Example 1, except that: the coagulant adding device 4 was closed, and no coagulant was added. After running for 4 hours, the operating flux was stabilized at 163LMH, the transmembrane pressure was 0.05MPa, and the SDI value was 2.65. After running for 6 days, the transmembrane pressure increased to 0.15MPa. After maintenance cleaning (CEB), the transmembrane pressure recovered to 0.05MPa.

[0028] It can be seen from the comparison between Example 1 and Comparative Example 1 that after the coagulant is added through the coagulant adding device 4, the SDI value is reduced from 2.65 to 1.53, the operating flux is increased from 163LMH to 265LMH, and the maintenance cleaning cycle (CEB) is extended from 6 days to 33 days, and the cleaning cycle is extended by more than 5 times.

[0029] Comparative Example 2:

[0030] The same as Example 1, except that the stirring tank 1 is removed, and inorganic flocculants and organic coagulants are added through the coagulant adding device 3 and the coagulant aid adding device 4. After mixing through the water inlet pipe 2, they directly enter the ceramic membrane filtration device 5. After running for 3 hours, the operating flux is stabilized at 168LMH, the transmembrane pressure difference is 0.05MPa, and the SDI value is 2.3. After running for 3 days, the transmembrane pressure difference increases to 0.15MPa. After maintenance cleaning (CEB), the transmembrane pressure difference is restored to 0.5MPa.

[0031] From the comparison between Example 1 and Comparative Example 2, it can be seen that after stirring and mixing in the stirring tank 1, the SDI value is reduced from 2.3 to 1.53, the operating flux is increased from 168LMH to 265LMH, and the maintenance cleaning cycle (CEB) is extended from 3 days to 33 days, and the maintenance cleaning cycle is extended by more than 10 times.

[0032] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0033] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A coagulation-coupled ceramic membrane water treatment device, characterized in that: include: A stirring tank (1), wherein the inlet of the stirring tank (1) is connected to a water inlet pipe (2), and a coagulant adding device (3) and a coagulant aid adding device (4) are sequentially installed on the water inlet pipe (2) along the water inlet direction; A ceramic membrane filtration device (5), wherein the inlet of the ceramic membrane filtration device (5) is connected to the outlet of the stirring tank (1) via a pipeline (6).

2. A coagulation-coupled ceramic membrane water treatment device according to claim 1, characterized in that: The material of the stirring tank (1) is one of carbon steel, stainless steel, duplex steel, titanium alloy metal materials and metal anti-corrosion materials, or one of glass fiber reinforced plastics, PVC and polypropylene non-metal materials.

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