Electrocoagulation-membrane bioreactor

Abstract

The application discloses an electric flocculation-membrane bioreactor, which comprises flat-plate membranes, a tank body, an aeration disc and a water inlet pipe. The flat-plate membranes are installed in the inner cavity of the tank body; the flat-plate membranes are provided in two groups; each group of the flat-plate membranes comprises a cathode part and an anode part; the cathode part and the anode part are symmetrically arranged along the center line of the tank body; and the two groups of the flat-plate membranes are arranged in a rectangular shape with the center of the tank body as the center. The aeration disc is installed at the bottom of the tank body; the effective area of the aeration disc is equal to the area surrounded by the flat-plate membranes; the wastewater needing to be treated is sent into the tank body through the water inlet pipe; then the gas is sprayed out from the aeration disc through the aeration pipe and moves upwards along the first flow channel, drives the wastewater in the first flow channel to move upwards and then moves downwards from the direction of the second flow channel; and the structure of the flat-plate membranes is arranged, so that the efficiency of treating the wastewater is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to sewage treatment technical field, specifically to a kind of electrocoagulation-membrane bioreactor. BACKGROUND

[0002] Membrane bioreactor is regarded as the mainstream technology of future sewage treatment due to small footprint, good effluent quality and other advantages, but the bottleneck problems such as poor nitrogen and phosphorus removal performance and membrane fouling limit its popularization and application to some extent;Electrocoagulation-membrane bioreactor (EC-MBR) is a new wastewater treatment technology combining electrochemistry, biological treatment and conductive membrane separation technology, which can not only strengthen the denitrification and phosphorus removal performance of the reactor, but also effectively alleviate membrane pollution, and is expected to become a new generation of efficient membrane bioreactor.

[0003] In the prior art, the traditional MBR process cannot provide nitrification and denitrification processes simultaneously;And the traditional MBR relies only on the enrichment of phosphorus-accumulating bacteria, and then realizes phosphorus removal by sludge discharge, and the phosphorus removal efficiency is limited;And the main components of extracellular polymeric substances (EPS) and soluble microbial products (SMP) secreted by microorganisms are polysaccharides and proteins, which are viscous and have strong adsorption capacity, can be adsorbed on the membrane surface to block the membrane pores, causing membrane pollution, thereby reducing the membrane flux and increasing the cleaning frequency. SUMMARY

[0004] The purpose of the present application is to solve the problems in the above background art, and to provide an electrocoagulation-membrane bioreactor.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] An electrocoagulation-membrane bioreactor, comprising:

[0007] Flat plate membrane, flat plate membrane is installed in the inner cavity of tank body;

[0008] The flat plate membrane is provided with two groups, each group of flat plate membrane includes cathode part and anode part, the cathode part and the anode part are respectively arranged symmetrically along the center line of the tank body, and the two groups of flat plate membranes are arranged in rectangular shape with the center of the tank body;

[0009] Aeration disc, aeration disc is installed in the bottom of tank body, and the effective area of aeration disc is equal to the area surrounded by flat plate membrane.

[0010] As a further scheme of the present application: the tank body is filled with filler.

[0011] As a further scheme of the present application: the first flow channel is formed between the two groups of flat plate membranes, the second flow channel is formed between the flat plate membrane and the inner wall of the tank body, and the first flow channel and the second flow channel form a circulating flow channel.

[0012] As a further scheme of the present application, the sewage is circulated along the first flow groove to the second flow groove.

[0013] As a further scheme of the present application, the flat membrane base and the flat membrane are connected in a plug-in manner.

[0014] As a further scheme of the present application, the flat membrane base and the inner wall of the tank body are connected in a clamping groove manner.

[0015] As a further scheme of the present application, the upper portion of the cylindrical portion is provided with a perforated baffle, and the perforated baffle and the baffle clamping groove are installed on the inner wall of the tank body.

[0016] As a further scheme of the present application, one side of the bottom of the tank body is provided with a water inlet pipe.

[0017] As a further scheme of the present application, the other side of the bottom of the tank body is provided with an aeration pipe connected with an aeration disc.

[0018] As a further scheme of the present application, one side of the top surface of the tank body is provided with a water outlet pipe.

[0019] The present application has the following beneficial effects:

[0020] The EC-MBR of the present application has the following advantages:

[0021] 1. Improving denitrification performance: The complete biological denitrification process of sewage includes nitrification and denitrification, wherein the nitrification reaction occurs under aerobic conditions, and the denitrification reaction occurs under anaerobic conditions. The traditional MBR process can only provide one of the aerobic conditions or the anaerobic conditions. However, in the EC-MBR, the bottom aeration device provides an aerobic environment, and the inner layer of the fluidized filler in the reactor provides an anaerobic condition, so that nitrification and denitrification can occur at the same time.

[0022] 2. Improving phosphorus removal efficiency: The traditional MBR relies on the enrichment of phosphorus accumulating organisms, and then realizes sewage phosphorus removal through sludge discharge. In the EC-MBR, in addition to the biological phosphorus removal effect of the phosphorus accumulating organisms, the sacrificial release of Fe 3+ / Fe 2+ / Al 3+ ions by the anode material can also realize electrocoagulation phosphorus removal.

[0023] 3. Improving membrane scale inhibition performance: Membrane fouling is inevitable in the MBR process, and in the EC-MBR, membrane fouling can be well delayed. Under the electric field conditions in the EC-MBR, the secretion of EPS and SMP by microorganisms can be well inhibited, thereby delaying membrane fouling, improving membrane scale inhibition performance, and reducing membrane cleaning frequency. BRIEF DESCRIPTION OF DRAWINGS

[0024] The present application will be further described below with reference to the accompanying drawings.

[0025] Figure 1 is a structural schematic diagram of the present application;

[0026] Figure 2 is a structural schematic diagram of the flat membrane installation of the present application.

[0027] In the figure: 1, tank body; 2, flat membrane; 3, flat membrane base; 4, aeration disc; 5, perforated baffle. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0029] Embodiment 1

[0030] Please refer to Figures 1-2 The present application is an electrocoagulation-membrane bioreactor, which comprises a tank body;

[0031] The tank body 1 is arranged on a base, the tank body 1 is composed of a cylindrical part and a conical part, the cylindrical part is installed on the conical part, and the tank body 1 is filled with fillers, the fillers include polyurethane fillers, the size of the fillers is 1cm*1cm*1cm, and the filling volume ratio is 30%; wherein the tank body 1 and the base are both made of organic glass material;

[0032] The flat membrane 2 is installed in the inner cavity of the tank body 1;

[0033] Specifically, the flat membrane 2 is provided with two groups, each group of flat membrane 2 includes a cathode part and an anode part, the cathode part is a conductive flat membrane, and the material is modified carbonization; the anode material is a stainless steel plate, the electric field strength is 0.2V / cm, and the cathode part and the anode part are respectively arranged symmetrically along the center line of the tank body 1, and the two groups of flat membrane 2 are respectively arranged in a rectangular arrangement mode along the center line of the tank body 1; the electrocoagulation-membrane bioreactor of the present application sets two groups of flat membrane 2 in a rectangular arrangement mode, compared with the existing single group of membrane reactor, which effectively increases the sewage treatment capacity;

[0034] The first flow channel is formed between the two groups of flat membrane 2, the second flow channel is formed between the flat membrane 2 and the inner wall of the tank body 1, and the first flow channel and the second flow channel form a circulating flow channel; during treatment, the sewage flows into the second flow channel along the first flow channel for circulating treatment;

[0035] Wherein, the flat membrane 2 is installed on the inner wall of the tank body 1 through the flat membrane base 3, and the flat membrane base 3 is arranged at the connection between the cylindrical part and the conical part.

[0036] Preferably, the flat membrane base 3 is connected to the flat membrane 2 in a plug-in manner, and the flat membrane base 3 is connected to the inner wall of the tank body 1 in a clamping groove manner; the structure of the flat membrane base 3 is arranged so that it is convenient for quick installation and disassembly between the flat membrane 2 and the tank body 1; when not in use, the flat membrane base 3 can be disassembled from the tank body 1;

[0037] In addition, the conical part is provided with an aeration disc 4, and the aeration disc 4 is matched with the first flow groove, that is, the effective area of the aeration disc 4 is equal to the area of the first flow groove; the aeration disc 4 can have a hemispherical structure or a rectangular structure, etc.

[0038] A perforated baffle 5 is arranged above the cylindrical part, and the perforated baffle 5 is installed on the inner wall of the tank body 1 through the baffle clamping groove;

[0039] In addition, a water inlet pipe is arranged on one side of the bottom of the tank body 1, an aeration pipe is arranged on the other side of the bottom of the tank body 1, the aeration pipe is connected with the aeration disc 4, and a water outlet pipe is arranged on one side of the top surface of the tank body 1.

[0040] Example 2

[0041] Based on the above-mentioned example 1, the working method of the electric flocculation-membrane bioreactor comprises the following steps:

[0042] The sewage to be treated is sent into the tank body 1 through the water inlet pipe, then the gas is sprayed out from the aeration disc 4 through the aeration pipe, and moves upwards along the first flow groove, which drives the sewage in the first flow groove to move upwards and then downwards from the direction of the second flow groove, the sewage and the filler flow upwards through the aeration shearing action and the blocking action of the anode and cathode materials, change the flow direction after being blocked by the perforated baffle 5 at the upper end, and enter the second flow groove, and then flow back to the bottom through the blocking action of the anode and cathode materials and the inner wall of the reactor, so as to realize the maximum contact between the sewage and the filler and improve the treatment performance of the reactor.

[0043] Comparative example

[0044] Comparative example 1 adopts a single set of flat membrane, and the other structures of the electric flocculation-membrane bioreactor are the same as those of example 1;

[0045] Comparative example 2 does not use filler, and the other structures of the electric flocculation-membrane bioreactor are the same as those of example 1;

[0046] Comparative example 3 does not use an external electric field (the electric field strength is 0 V / cm), and the other structures of the electric flocculation-membrane bioreactor are the same as those of example 1.

[0047] The sewage treatment performance tests of examples 1-2 and comparative examples 1-3 are carried out:

[0048] Table 1 total nitrogen, total phosphorus removal rate and membrane cleaning cycle of examples 1-2 and comparative examples 1-3

[0049] Effect Example Total nitrogen removal rate (%) Total phosphorus removal rate (%) Membrane cleaning cycle (hours) Example 1 85 76 62 Example 2 91 82 65 Comparative Example 1 63 51 25 Comparative Example 2 49 68 29 Comparative Example 3 43 34 22

[0050] From table 1, the total nitrogen, total phosphorus removal rate and membrane scale inhibition performance of the application is obviously better than that of the comparative examples.

[0051] The working principle of the application: the application is an integrated sewage treatment equipment coupling electrocoagulation technology and conductive membrane bioreactor, using single chamber configuration, and the electrochemical anode and conductive membrane (cathode) are both installed in an embedded way;

[0052] The cathode is a new type of separation membrane with good conductivity, and the conductivity is obtained by covering conductive polymers (such as polypyrrole, polyaniline, etc.) on the membrane surface. The conductive polymer is easy to synthesize, has strong conductivity, and has good heat resistance and corrosion resistance, so it can be covered on the membrane surface by surface coating or chemical polymerization, thereby improving the conductivity of the membrane surface;

[0053] Aluminum and iron are often used as electrochemical sacrificial anodes due to their good electrocoagulation effect, low economic cost and other advantages. Fe 2+ / Fe 3+ or Al 3+ generated by electrolysis further form the corresponding hydroxides in the system to participate in the biochemical reactions in the system, which can significantly improve the denitrification and phosphorus removal performance of the reactor system and the membrane scale inhibition ability;

[0054] Electrophoretic scale inhibition and electrocoagulation scale inhibition complement each other, which can significantly improve the membrane pollution control ability; under the condition of 0.2V / cm electric field, the membrane surface filter cake layer is reduced by 38% compared with ordinary MBR, the membrane flux is increased by two times, the membrane cleaning cycle is prolonged by three times, and the membrane pollution is greatly relieved; the electrocoagulation phosphorus removal technology coupled with the biological phosphorus removal process can ensure that the total phosphorus in the effluent meets the discharge standard; the anode ammonia oxidation, cathode denitrification and simultaneous nitrification and denitrification together can effectively improve the denitrification performance of the reactor.

[0055] The above describes one embodiment of the application in detail, but the content described is only the preferred embodiment of the application, and cannot be considered as limiting the scope of the application. Any equivalent changes and improvements made within the scope of the application should still belong to the patent coverage of the application.

Claims

1. An electrocoagulation-membrane bioreactor characterized in that, The utility model relates to a flat plate membrane (2) is installed in the inner chamber of the jar body (1), and the flat plate membrane (2) is provided with two groups, and each group of flat plate membrane (2) includes cathode part and anode part, and the cathode part and anode part are respectively arranged along the center line symmetry of the jar body (1), and two groups of flat plate membrane (2) are arranged respectively with the center rectangle of jar body (1) arrangement, The utility model relates to a flat plate membrane (2) is installed in the inner chamber of the jar body (1), and the flat plate membrane (2) is provided with two groups, and each group of flat plate membrane (2) includes cathode part and anode part, and the cathode part and anode part are respectively arranged along the center line symmetry of the jar body (1), and two groups of flat plate membrane (2) are arranged respectively with the center rectangle of jar body (1) arrangement, The utility model relates to a flat plate membrane (2) is installed in the inner chamber of the jar body (1), and the flat plate membrane (2) is provided with two groups, and each group of flat plate membrane (2) includes cathode part and anode part, and the cathode part and anode part are respectively arranged along the center line symmetry of the jar body (1), and two groups of flat plate membrane (2) are arranged respectively with the center rectangle of jar body (1) arrangement, The utility model relates to a flat plate membrane (2) is installed in the inner chamber of the jar body (1), and the flat plate membrane (2) is provided with two groups, and each group of flat plate membrane (2) includes cathode part and anode part, and the cathode part and anode part are respectively arranged along the center line symmetry of the jar body (1), and two groups of flat plate membrane (2) are arranged respectively with the center rectangle of jar body (1) arrangement, The utility model relates to a flat plate membrane (2) is installed in the inner chamber of the jar body (1), and the flat plate membrane (2) is provided with two groups, and each group of flat plate membrane (2) includes cathode part and anode part, and the cathode part and anode part are respectively arranged along the center line symmetry of the jar body (1), and two groups of flat plate membrane (2) are arranged respectively with the center rectangle of jar body (1) arrangement, The utility model relates to a flat plate membrane (2) is installed in the inner chamber of the jar body (1), and the flat plate membrane (2) is provided with two groups, and each group of flat plate membrane (2) includes cathode part and anode part, and the cathode part and anode part are respectively arranged along the center line symmetry of the jar body (1), and two groups of flat plate membrane (2) are arranged respectively with the center rectangle of jar body (1) arrangement, The utility model relates to a flat plate membrane (2) is installed in the inner chamber of the jar body (1), and the flat plate membrane (2) is provided with two groups, and each group of flat plate membrane (2) includes cathode part and anode part, and the cathode part and anode part are respectively arranged along the center line symmetry of the jar body (1), and two groups of flat plate membrane (2) are arranged respectively with the center rectangle of jar body (1) arrangement, 2. An electrocoagulation-membrane bioreactor according to claim 1, characterized in that, The utility model relates to a flat plate membrane (2) is installed in the inner chamber of the jar body (1), and the flat plate 3. An electrocoagulation-membrane bioreactor according to claim 2, characterized in that, ​ 4. An electrocoagulation-membrane bioreactor according to claim 3, characterized in that, ​ 5. An electrocoagulation-membrane bioreactor according to claim 4, characterized in that, ​ 6. An electrocoagulation-membrane bioreactor according to claim 5, characterized in that, ​ 7. An electrocoagulation-membrane bioreactor according to claim 6, characterized in that, ​

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