CN211896256U - A membrane biological denitrification device for saline wastewater - Google Patents

Abstract

The utility model relates to a relevant equipment field of waste water treatment, concretely relates to contain membrane biological denitrification device of salt waste water, including the reaction box, be equipped with the reaction chamber in the reaction box, the reaction intracavity left and right sides is provided with first hollow fiber membrane subassembly and second hollow fiber membrane subassembly respectively, first hollow fiber membrane subassembly has hydrogen cylinder through intake-tube connection, second hollow fiber membrane subassembly passes through the play water piping connection vacuum pump, reaction box left side upper end is equipped with the water inlet, reaction chamber left side upper end is equipped with into water distribution orifice plate, the utility model provides a combine hydrogen autotrophy and heterotrophy denitrification to get rid of effectual and the little device of mud production volume to the total nitrogen that contains salt waste water.

Description

A membrane biological denitrification device for saline wastewater

technical field

The utility model relates to the field of related equipment for wastewater treatment, in particular to a membrane biological denitrification device for saline wastewater.

Background technique

With the continuous development and progress of my country's economy, the content of nitrogen elements in various water bodies such as agricultural, domestic, industrial wastewater and drinking water sources has continued to rise. Among them, nitrate nitrogen pollution is more common, and the harm caused is also more serious. The research treatment of nitrogen has attracted a lot of attention.

High-concentration nitrate nitrogen wastewater mainly comes from industrial production, such as pharmaceutical, steel, fertilizer production, meat processing, electronic components and other industries. The production wastewater from these enterprises has the characteristics of high nitrate nitrogen and low C/N ratio. Disposing of substandard discharges will cause serious pollution to nearby waters.

Nitrate ions in nitrate nitrogen can react with metal ions in nature to form nitrates, or become nitrates and nitrites through the action of nitrifying bacteria after wastewater enters the water body. Common types of nitrates are ammonium nitrate. , sodium nitrate, cerium nitrate, lead nitrate, calcium nitrate, etc. Nitrate nitrogen can follow the water cycle directly or indirectly into the human body, animals and plants. Over time, it will have a greater negative effect on human health, animal and plant growth, and even the entire ecological environment.

The increase of nitrogen content in the water body will lead to eutrophication of the water body, the algae in the water will overproduce and consume the dissolved oxygen in the water, resulting in the occurrence of red tide phenomenon, the increase of the turbidity of the water body and the unpleasant smell, resulting in the death of a large number of animals and plants in the water body. The decay of the bodies of algae and fish and shrimp will cause the water quality to continue to decline, forming a vicious circle. In the late 1990s, lakes with varying degrees of eutrophication in my country accounted for 77% of the total number of surveys.

Due to the serious harm of nitrate nitrogen, researchers have always attached great importance to the research in this field. The current denitrification technologies include physical and chemical methods and biological methods. At present, the biological method is the most widely used and most promising research at home and abroad, because the microorganisms used in the biological method are widely distributed, easy to cultivate and reproduce, and have strong adaptability to different processing environments. In comparison, the cost of biological method is also lower, no special structures are required, and it is not easy to cause secondary pollution.

For example, a device for MBR membrane biological denitrification disclosed in Chinese Patent Application No. CN201520003537.3, the device includes a container with an inlet, the container has a accommodating chamber, and the container is provided with a plurality of partitions, and The plurality of baffles divide the accommodating chamber into an anoxic tank, a nitrification tank, and an MBR membrane tank in turn. The three tanks are equipped with oxygen parameter test probes for environmental monitoring. The anoxic tank is connected to the container inlet. A mixed liquid reflux structure is arranged between the anoxic tank and the nitrification tank, and a suction structure is arranged in the MBR membrane tank. This utility model adopts the combined application of MBR membrane combined with biological method, very stably creates and utilizes the principle of biological denitrification to create stable biological denitrification conditions, and satisfies greater impact load, realizes the stable removal of ammonia nitrogen, and ensures the discharge of wastewater up to the standard .

However, the biological denitrification device in the prior art still has certain defects. For example, the device has a high demand for carbon source. When the carbon source is insufficient, problems such as poor denitrification effect and large sludge growth in the heterotrophic system may occur, resulting in The ideal denitrification effect cannot be achieved.

Moreover, this defect is also a common problem that plagues the research field of denitrification devices. There is no good solution in the prior art, so it is urgent to develop a membrane biological denitrification device that can overcome the above defects.

Utility model content

Aiming at the deficiencies of the prior art, the utility model provides a membrane biological denitrification device for salty wastewater with low demand for carbon sources and less sludge production, which makes up for the traditional heterotrophic reaction caused by insufficient carbon sources. The nitrification reaction is incomplete, the concentration of nitrate nitrogen in the effluent is high, and the total nitrogen is not up to the standard, which well achieves the purpose of removing the total nitrogen in the wastewater.

The utility model is realized through the following technical solutions:

A membrane biological denitrification device for saline wastewater, comprising a reaction box, a reaction chamber is arranged in the reaction box, and a first hollow fiber membrane module and a second hollow fiber membrane module are respectively arranged on the left and right sides of the reaction chamber , the first hollow fiber membrane assembly is connected to a hydrogen bottle through an air inlet pipe, the second hollow fiber membrane assembly is connected to a vacuum pump through a water outlet pipe, the upper left end of the reaction box is provided with a water inlet, and the upper left end of the reaction chamber is Equipped with water inlet distribution orifice plate.

Preferably, a water inlet distribution cavity is arranged on the inner side of the water inlet distribution orifice plate, a plurality of groups of evenly distributed water distribution holes are arranged at the bottom end of the water inlet distribution orifice plate, and the water inlet port is communicated with the water inlet distribution cavity, so The water inlet distribution cavity is communicated with the water distribution hole.

Preferably, the first hollow fiber membrane module includes a first installation frame and several groups of uniformly distributed first fiber membrane filaments, and the upper and lower ends of the first fiber membrane filaments are fixedly connected to the upper and lower sides of the inner side of the first installation frame, respectively. , the upper end of the first installation frame is provided with an air inlet cavity that communicates with the first fiber membrane filaments, and the front part of the top end of the first installation frame is provided with a first installation hole, and the air inlet pipe is fixedly connected to the first installation hole Above, the air intake pipe is communicated with the air intake cavity.

Preferably, the first fiber membrane filaments are air-permeable and water-impermeable.

Preferably, the second hollow fiber membrane module includes a second installation frame and several groups of uniformly distributed second limit membrane filaments, and the upper and lower ends of the second fiber membrane filaments are fixedly connected to the inner side of the second installation frame. The upper end of the second installation frame is provided with a water inlet cavity that communicates with the second fiber membrane, and the front part of the top end of the second installation frame is provided with a second installation hole, and the water outlet pipe is fixedly connected to the second installation On the hole, the water outlet pipe is communicated with the water inlet cavity.

Preferably, the second fiber membrane filaments have water permeability.

Preferably, the vacuum pump is electrically connected with a power source.

Preferably, the bottom end of the reaction chamber is inoculated with a salt-tolerant activated sludge and a salt-tolerant and denitrifying compound bacterial agent.

Preferably, microorganisms are suspended in the reaction chamber, and part of the microorganisms are attached to the first and second fibrous membrane filaments.

The beneficial effects of the utility model are as follows: the hydrogen bottle injects hydrogen into the first hollow fiber membrane assembly through the air inlet pipe, the hydrogen enters the waste water through the first fiber membrane wire, and reduces nitrate nitrogen and nitrite nitrogen in the waste water to nitrogen gas, Hydrogen autotrophic denitrification can well remove total nitrogen in wastewater and control the production of sludge; salt-tolerant activated sludge and salt-tolerant denitrification compound bacteria are inoculated at the bottom of the reaction chamber and combined with the suspension inside the reaction chamber Microorganisms can well perform heterotrophic denitrification and denitrification treatment of wastewater. The introduction of hydrogen removes oxidative gases in the device, which is conducive to creating an oxygen-deficient environment for heterotrophic denitrification. At the same time, the influent distribution orifice plate can evenly distribute wastewater, avoiding short flow and dead zone in the device. Two hollow fiber membrane modules filter the emergence of flow concentration.

Description of drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are just some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the structural representation of the present utility model;

Figure 2 is an isometric side view of the present invention;

3 is a cross-sectional view of the utility model at the water inlet distribution orifice plate.

In the figure: 1-reaction box, 101-reaction chamber, 102-water inlet, 2-water distribution orifice plate, 201-water distribution cavity, 202-water distribution hole, 3-first hollow fiber membrane module, 4-inlet Gas pipe, 5-Hydrogen cylinder, 6-Second hollow fiber membrane module, 7-Water outlet pipe, 8-Vacuum pump.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. The embodiments described above are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Please refer to FIGS. 1 to 3 , a membrane biological denitrification device for salty wastewater includes a reaction box 1 . The reaction box 1 is provided with a reaction chamber 101 , and the left and right sides of the reaction chamber 101 are respectively provided with first hollow fiber membrane modules. 3 and the second hollow fiber membrane assembly 6, the first hollow fiber membrane assembly 3 is connected with the hydrogen cylinder 5 through the air inlet pipe 4, the second hollow fiber membrane assembly 6 is connected with the vacuum pump 8 through the water outlet pipe 7, and the upper left end of the reaction box 1 is provided with The water inlet 102 and the upper left end of the reaction chamber 101 are provided with a water inlet distribution orifice 2 .

Specifically, a water inlet distribution cavity 201 is provided on the inner side of the water inlet distribution orifice plate 2, and several groups of evenly distributed water distribution holes 202 are arranged at the bottom end of the water inlet distribution orifice plate 2. The distribution cavity 201 is communicated with the water distribution hole 202. The first hollow fiber membrane module 3 includes a first installation frame and several groups of uniformly distributed first fiber membrane filaments. The upper and lower ends of the first fiber membrane filaments are respectively fixedly connected to the first installation frame. On the upper and lower sides of the inner side, the upper end of the first installation frame is provided with an air inlet cavity that communicates with the first fiber membrane, and the front part of the top end of the first installation frame is provided with a first installation hole, and the air inlet pipe 4 is fixedly connected to the first installation On the hole, the air inlet pipe 4 is communicated with the air inlet cavity, the first fiber membrane wire is breathable and watertight, and the second hollow fiber membrane module 6 includes a second installation frame and several groups of uniformly distributed second limit membrane wires. The upper and lower ends of the two fiber membrane wires are respectively fixedly connected to the upper and lower sides of the inner side of the second installation frame. The upper end of the second installation frame is provided with a water inlet cavity that communicates with the second fiber membrane wire, and the front of the top of the second installation frame is provided with a water inlet cavity. The second installation hole, the water outlet pipe 7 is fixedly connected to the second installation hole, the water outlet pipe 7 is communicated with the water inlet chamber, the second fiber membrane has water permeability, the vacuum pump 8 is electrically connected with a power supply, and the bottom end of the reaction chamber 101 The salt-tolerant activated sludge and the salt-tolerant denitrification compound bacterial agent are inoculated, microorganisms are suspended in the reaction chamber 101, and some microorganisms are attached to the first fiber membrane filament and the second fiber membrane filament.

In the present invention, when the device needs to be used, the waste water is injected into the water inlet distribution orifice plate 2 through the water inlet 102, and the water outlet position of the sewage can be well distributed through several groups of evenly distributed water distribution holes 202, avoiding the need for When the filtration concentration of the first hollow fiber membrane module 3 and the second hollow fiber membrane module 6 occurs, hydrogen is transported into the first hollow fiber membrane module 3 through the hydrogen cylinder 5 and the air inlet pipe 4. Since the first hollow fiber membrane module 3. It includes a first installation frame and several groups of uniformly distributed first fiber membrane filaments. The upper and lower ends of the first fiber membrane filament are fixedly connected to the upper and lower sides of the inner side of the first installation frame. The upper end of the first installation frame is provided with the first fiber membrane. The air inlet cavity is connected with the membrane filaments, and the front part of the top of the first installation frame is provided with a first installation hole, the air inlet pipe 4 is fixedly connected to the first installation hole, the air inlet pipe 4 is communicated with the air inlet cavity, and the first fiber The membrane is breathable and impermeable. Hydrogen enters the wastewater through the first fiber membrane and reacts with nitrate nitrogen and nitrite nitrogen in the wastewater to be reduced to nitrogen. Hydrogen autotrophic denitrification can well remove the waste water. Total nitrogen and control the production of sludge, connect the second hollow fiber membrane module 6 with the water outlet pipe 7 through the vacuum pump 8, because the second hollow fiber membrane module 6 includes a second installation frame and several groups of uniformly distributed second limit membrane filaments The upper and lower ends of the second fiber membrane wire are fixedly connected to the upper and lower sides of the inner side of the second installation frame, the upper end of the second installation frame is provided with a water inlet cavity that communicates with the second fiber membrane wire, and the front part of the top end of the second installation frame is provided There is a second installation hole, the water outlet pipe 7 is fixedly connected to the second installation hole, the water outlet pipe 7 is communicated with the water inlet cavity, the second fiber membrane wire has water permeability, and the vacuum pump 8 is electrically connected with a power supply, through the vacuum pump 8 The treated water can be drawn out, and the whole device is simple in structure and strong in practicability.

The above embodiments are only used to illustrate the technical solutions of the present utility model, but not to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be used for the foregoing implementations. The technical solutions described in the examples are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims (9)

1. The utility model provides a membrane biological denitrification device who contains salt waste water which characterized in that: the reaction device comprises a reaction box (1), wherein a reaction cavity (101) is arranged in the reaction box (1), a first hollow fiber membrane component (3) and a second hollow fiber membrane component (6) are respectively arranged on the left side and the right side in the reaction cavity (101), the first hollow fiber membrane component (3) is connected with a hydrogen cylinder (5) through an air inlet pipe (4), the second hollow fiber membrane component (6) is connected with a vacuum pump (8) through an water outlet pipe (7), a water inlet (102) is formed in the upper end of the left side of the reaction box (1), and a water inlet distribution pore plate (2) is arranged at the upper end of the left side of the reaction cavity (101.

2. The apparatus of claim 1, wherein: the water inlet distribution pore plate is characterized in that a water inlet distribution cavity (201) is formed in the inner side of the water inlet distribution pore plate (2), a plurality of groups of water distribution holes (202) which are uniformly distributed are formed in the bottom end of the water inlet distribution pore plate (2), the water inlet is communicated with the water inlet distribution cavity (201), and the water inlet distribution cavity (201) is communicated with the water distribution holes (202).

3. The apparatus of claim 1, wherein: the first hollow fiber membrane component (3) comprises a first mounting frame and a plurality of groups of first fiber membrane filaments which are uniformly distributed, the upper end and the lower end of each first fiber membrane filament are fixedly connected to the upper side and the lower side of the inner side of the first mounting frame respectively, an air inlet cavity communicated with the first fiber membrane filaments is formed in the upper end of the first mounting frame, a first mounting hole is formed in the front portion of the top end of the first mounting frame, an air inlet pipe (4) is fixedly connected to the first mounting hole, and the air inlet pipe (4) is communicated with the air inlet cavity.

4. The apparatus of claim 3, wherein: the first fiber membrane filaments have air-permeability and water-impermeability.

5. The apparatus of claim 1, wherein: the second hollow fiber membrane component (6) comprises a second mounting frame and a plurality of groups of uniformly distributed second fiber membrane filaments, the upper end and the lower end of each second fiber membrane filament are fixedly connected to the upper side and the lower side of the inner side of the second mounting frame respectively, a water inlet cavity communicated with the second fiber membrane filaments is formed in the upper end of the second mounting frame, a second mounting hole is formed in the front portion of the top end of the second mounting frame, a water outlet pipe (7) is fixedly connected to the second mounting hole, and the water outlet pipe (7) is communicated with the water inlet cavity.

6. The apparatus of claim 5, wherein: the second fiber membrane filaments have water permeability.

7. The apparatus of claim 1, wherein: the vacuum pump (8) is electrically connected with a power supply.

8. The apparatus of claim 1, wherein: the bottom end of the reaction cavity (101) is inoculated with salt-tolerant activated sludge and salt-tolerant denitrification composite microbial inoculum.

9. The apparatus of claim 1, wherein: microorganisms are suspended in the reaction cavity (101), and part of the microorganisms are attached to the first fiber membrane filaments and the second fiber membrane filaments.

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