CN212740884U - High-efficiency denitrification device for polluted seawater - Google Patents

Abstract

The utility model provides a high-efficient denitrification facility of polluted seawater, the device comprises the level four denitrogenation sub-device that concatenates together in proper order, is linked together through the raceway between the device between the level four denitrogenation sub-device, all fills in the level four denitrogenation sub-device has microorganism immobilized carrier material, respectively is provided with a set of aeration head in level one denitrogenation sub-device and the level four denitrogenation sub-device, the aeration head passes through the aeration pipe and is connected with the outer fan of device. The utility model adopts the microbial immobilized carrier material coupled OA2O four-stage biochemical process to treat polluted seawater in different locations. The N degrading bacteria which are enriched and screened are immobilized on the modified polyurethane microbial carrier, so that the microbial activity is increased, the microbial loss is effectively reduced, the N and other nutrients in polluted seawater can be efficiently degraded, and the problems of low microbial growth rate, poor activity and easy loss in water in the traditional microbial technology are solved.

Description

High-efficiency denitrification device for polluted seawater

Technical Field

The utility model belongs to the technical field of water renovation prosthetic devices.

Background

In 2015, ten water items are shown in the action plan for water pollution control, which marks that the water environment is valued to an unprecedented height, and all departments in each region develop special work for water body remediation and restoration according to local conditions.

The continuous entry of offshore pollutants into the sea leads to the gradual deterioration of the water environment quality in offshore areas, and inorganic nitrogen is one of the main pollutants for polluting seawater. The conventional polluted water body treatment adopts the conventional microorganism remediation technology, namely the polluted water body is treated by adopting the independent or combined SBR, MBR, AO and A2O processes, however, the defects of large amount of excess sludge, large occupied area, long retention time, low treatment efficiency, poor treatment effect, large energy consumption of oxygen enrichment during aeration, low efficiency and the like exist by adopting the conventional microorganism ex-situ remediation mode.

The traditional microbial remediation process device has a good effect of removing soluble organic matters and nitrogen and phosphorus in the polluted water body. However, the traditional microorganism repairing process device still has some problems in the application of the polluted seawater treatment engineering with higher salt content:

1. the microorganism has low growth rate, poor activity, long retention time, low treatment efficiency, poor effect, high investment cost, large occupied area, easy generation of residual activated sludge and the like;

2. the denitrification rate of the traditional microbial treatment process is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the problems of the traditional microbial remediation process device and provide a high-efficiency denitrification device for polluted seawater. In order to solve the problems, the utility model adopts the microbial immobilization technology coupled with the OA2O level four biochemical process, which can improve the removal rate of inorganic nitrogen in the polluted seawater to more than 90%.

The technical scheme of the utility model

The utility model provides a high-efficient denitrification device of polluted seawater, the device comprises the level four denitrogenation sub-device that connects together in proper order in series, is one-level denitrogenation sub-device, second grade denitrogenation sub-device, tertiary denitrogenation sub-device and level four denitrogenation sub-device respectively, is linked together through the raceway between the device between the level four denitrogenation sub-device, and the upper end of raceway between the device communicates with the upper portion of preceding level denitrogenation sub-device, and the lower extreme extends to the lower part of back level denitrogenation sub-. All pack in the level four denitrogenation daughter device and have microorganism immobilization carrier material, respectively be provided with a set of aeration head in level one denitrogenation daughter device and the level four denitrogenation daughter device, the aeration head passes through the aeration pipe and is connected with the outer fan of device, and the bottom of level one denitrogenation daughter device is equipped with the water inlet, and the upper portion of level four denitrogenation daughter device is equipped with the delivery port.

The bottom of the third-stage denitrifier device is connected with a dosing barrel through a dosing pipe. The top of each denitrification sub-device is provided with a device cover.

The utility model has the advantages and beneficial effect:

the utility model discloses an immobilization microorganism technique is through fixing the microorganism that will have high-efficient denitrogenation on special microorganism carrier, make it still can keep very high microbial density and biological activity in the complex environment to can proliferate fast under suitable condition, have that the treatment effeciency is high, the reaction rate is fast, do not produce surplus sludge, a great deal of advantages such as operation reliable and stable, its treatment effeciency is 5-6 times of traditional microbial remediation technology, and also possess advantages in the aspect of pollutants such as degradation N.

The modified polyurethane microbial adsorption material is adopted to immobilize the enriched and screened denitrifying bacteria on the surface of the carrier, so that the carrier material effectively increases the activity of microbes, enhances the sewage treatment effect, reduces the hydraulic retention time, effectively reduces the volume of equipment and does not generate residual sludge.

The OA2O process is adopted for denitrification, ammonia nitrogen in the polluted seawater is converted into nitrate nitrogen in the first-stage aerobic zone, and the nitrate nitrogen is converted into nitrogen in the second-stage anaerobic zone and the third-stage anaerobic zone, so that the aim of denitrification more than 90% is fulfilled.

Drawings

FIG. 1 is a schematic view of a high-efficiency denitrification apparatus for polluted seawater.

In the figure, 1 a denitrification device, 1-1 a primary denitrification device, 1-2 a secondary denitrification device, 1-3 a tertiary denitrification device and 1-4 a fourth denitrification device; 2 a dosing pipe, 3 a water outlet, 4 a dosing barrel, 5 a fan, 6 an aeration pipe, 7-1 an aeration head a, 7-2 an aeration head b, 8-1 an inter-device water pipe a, 8-2 an inter-device water pipe b, 8-3 an inter-device water pipe c, 9 a water inlet and 10 a microorganism immobilization carrier material.

Detailed Description

Example 1:

as shown in figure 1, the device comprises four-stage denitrogenation sub-devices which are sequentially connected in series, namely a first-stage denitrogenation sub-device 1-1, a second-stage denitrogenation sub-device 1-2, a third-stage denitrogenation sub-device 1-3 and a fourth-stage denitrogenation sub-device 1-4, wherein the four-stage denitrogenation sub-devices are communicated with each other through inter-device water pipes (8-1 inter-device water pipe a, 8-2 inter-device water pipe b and 8-3 inter-device water pipe c), the upper ends of the inter-device water pipes are communicated with the upper part of the previous-stage denitrogenation sub-device, and the lower ends of the inter-device water pipes extend to the lower part. The four-stage denitrification device is filled with microorganism immobilized carrier materials 10, a group of aeration heads, namely 7-1 aeration head a and 7-2 aeration head b, are respectively arranged in the first-stage denitrification device and the four-stage denitrification device, the aeration heads are connected with a fan 5 outside the device through an aeration pipe 6, a water inlet 9 is arranged at the bottom of the first-stage denitrification device, and a water outlet 3 is arranged at the upper part of the four-stage denitrification device. The bottom of the third-stage denitrifier device is connected with a dosing barrel 4 through a dosing pipe 2. The top of each denitrification sub-device is provided with a device cover.

Reference dimension of device

1. The length, width and height of the first, second, third and fourth grade sub-devices are respectively 2.2 m.

2. The water pipe between the devices is made of 316L stainless steel pipes, the inner diameter of the water pipe is 5.0cm, the height of the top of the water pipe between the first-level device and the second-level device from the ground is 2.1m, the height of the bottom of the water pipe between the second-level device and the third-level device from the ground is 25cm, the height of the top of the water pipe between the third-level device and the third-level device from the ground is 2.0m, the height of the bottom of the water pipe between the third-level device and the fourth-level device.

3. The height of the water inlet from the ground is 25cm, the height of the water outlet from the ground is 1.8m, the water inlet and the water outlet are connected by adopting PVC loose joints, the inner diameter of the water inlet is 5.0cm, and the inner diameter of the water outlet is 5.0 cm.

4. The aeration pipe adopts 316L stainless steel pipe, and the internal diameter is 2.0cm, and the aeration head adopts EPDM rubber material, and diameter 15cm attaches in first order of device and fourth level bottom, uses the pvc union coupling between the aeration head, and the inside diameter of pipe is 2.0 cm.

5. The medicine feeding pipe is a PVC pipe with the inner diameter of 2.0 cm.

6. Device cover, size 80 cm.

Functional action of the parts of the denitrification installation

(1) A fan: compressing air into an aeration pipe;

(2) an aeration pipe: delivering air to the first and fourth stage sub-assemblies;

(3) an aeration head: the air compressed by stages generates micro-nano-scale fine bubbles; the aeration bubble has small diameter, large gas-liquid interface area, uniform bubble diffusion, no eyelet blockage and strong corrosion resistance. The diameter of the aeration head is 15cm, the middle of the aeration head is convex, and the height of the convex is 2 cm.

(4) Water conveying pipes between the devices: the water body on the top of the upper-stage sub-device enters the bottom of the lower-stage sub-device through the water conveying pipe between the devices;

(5) a medicine adding barrel: a carbon source supplying and storing device, and pumping the carbon source into the dosing pipe;

(6) a medicine feeding pipe: conveying the carbon source in the dosing barrel to the bottom of the third-stage device (connected from the top layer to the bottom through a pipeline);

(7) a device cover: a service access for individual equipment;

(8) microorganism-immobilized carrier material (modified polyurethane): the carrier for fixing the microorganisms avoids the loss of the microorganisms and increases the activity of the microorganisms; the surface of the material has a large amount of carboxyl and ketocarbonyl, so that microorganisms can be effectively fixed, the loss of the microorganisms is avoided, and the activity of the microorganisms is increased. The length is 3cm, and the width and the height are respectively 2 cm. The immobilized carrier material is filled in the whole device of the first, second, third and fourth grade sub-devices, and the actual occupied volume is about 30m³；

(9) Water inlet: a polluted seawater inlet;

(10) water outlet: and (4) a seawater outlet after denitrification.

The design principle of the utility model

1. Analysis of microorganism-immobilized Carrier Material

The microorganism immobilized carrier material is prepared by immobilizing specially selected N nutrient degrading bacteria on a special microorganism carrier, namely modified polyurethane. In a complex environment, the microorganism immobilization technology is beneficial to the microorganisms to keep high biological activity; the rapid proliferation of the microorganism is facilitated under the appropriate conditions; is beneficial to improving the density of microorganisms (especially special-function microorganisms); beneficial to the microorganisms to resist the influence of adverse environment; is favorable for solid-liquid separation after reaction. The microorganism immobilization technology has the advantages of high treatment efficiency, high reaction speed, less microorganism loss, stable and reliable operation, no generation of residual sludge and the like.

In this example, modified polyurethane was used as the microorganism-immobilized carrier material. The polyurethane surface has more carboxyl and ketone carbonyl, so that the microorganism is easier to adsorb on the polyurethane material, the loss of the microbial inoculum can be avoided, and the microorganism can keep stronger biological activity.

2. Denitrification line

The conventional water treatment process such as A2O process has low denitrification efficiency, and the maximum denitrification efficiency is only about 80 percent.

The utility model discloses the device adopts OA2O technology denitrogenation, and the biochemical device of level four is first order good oxygen, the tertiary facultative anaerobism of second, the fourth level is good oxygen promptly, and the microorganism can be effectively adsorbed to the carboxyl and the ketone carbonyl of microorganism immobilization carrier material (modified polyurethane) surface positive charge, prevents that the microorganism from running off in the faster water of velocity of flow. The microorganisms convert ammonia nitrogen in the polluted seawater into nitrate nitrogen in the aerobic zone of the first-stage denitrifier device, and the nitrate nitrogen is converted into nitrogen in the second-stage denitrifier device and the third-stage denitrifier device (facultative anaerobic zone and anaerobic zone), so that the aim of denitrogenating more than 90% is fulfilled. The fourth sub-unit (aerobic zone) breaks down the excess carbon source.

Workflow process

1. Opening the fan and transmitting gas to the ventilating pipeline;

2. the aeration head generates bubbles, thereby effectively increasing the oxygen content near the microorganism immobilized carrier material in the first-level and fourth-level denitrogenation sub-device reactors;

3. opening the dosing barrel, and conveying the carbon source in the dosing barrel to the bottom of the third-stage device through a dosing pipeline;

4. the polluted water body enters from the bottom of the first-stage sub-device, enters from the top of the first-stage sub-device into the bottom of the second stage along the water conveying pipeline between the devices, sequentially enters into the third-stage denitrification sub-device and the fourth-stage sub-device in such a way, and is discharged from the water outlet at the top of the fourth-stage sub-device.

5. Ammonia nitrogen in the polluted seawater is converted into nitrate nitrogen in the first-stage aerobic zone, the nitrate nitrogen is converted into nitrogen in the second-stage anaerobic zone and the third-stage anaerobic zone, and redundant carbon sources are eliminated in the fourth-stage aerobic zone.

Application prospect

Because the utility model discloses rational in infrastructure, when utilizing current microorganism immobilization carrier material and new denitrogenation technology, made a lot of improvements, the stability of microbial inoculum is high in this product, active good, and the degradation pollutant performance is high, and equipment area is little, and day throughput is strong, does not produce surplus sludge, has solved the problem that traditional microbial remediation water body met in the treatment of contaminated seawater comprehensively. Therefore, the device of the utility model has very wide prospect in the treatment of polluted seawater, and is suitable for treating large-scale water.

Claims (6)

1. The utility model provides a pollute high-efficient denitrification device of sea water, its characterized in that, the device comprises the level four denitrogenation sub-device that concatenates together in proper order, is one-level denitrogenation sub-device, second grade denitrogenation sub-device, tertiary denitrogenation sub-device and level four denitrogenation sub-device respectively, is linked together through the raceway between the device between the level four denitrogenation sub-device, all fills in the level four denitrogenation sub-device and has the immobilized carrier material of microorganism, respectively is provided with a set of aeration head in one-level denitrogenation sub-device and the level four denitrogenation sub-device, the aeration head passes through the aeration pipe and is connected with the outer fan of device, and the bottom of one.

2. The efficient denitrification device for polluted seawater as claimed in claim 1, wherein the bottom of the tertiary denitrification sub-device is connected with a dosing barrel through a dosing pipe.

3. The device for efficiently denitrifying polluted seawater as defined in claim 1 or 2, wherein said aeration head has a diameter of 15cm, a central protrusion with a height of 2cm, and aeration holes are distributed on the aeration head.

4. The apparatus for highly efficient denitrification of contaminated seawater according to claim 1 or 2, wherein said microorganism-immobilized carrier material has a length of 3cm, a width and a height of 2cm, respectively.

5. The device for efficiently denitrifying polluted seawater as defined in claim 1 or 2, wherein the upper end of the inter-device water pipe is communicated with the upper part of the previous-stage denitrification sub-device, and the lower end thereof extends to the lower part of the next-stage denitrification sub-device.

6. The apparatus for highly efficient denitrification of contaminated seawater according to claim 1 or 2, wherein a cover is provided on each of the top of the primary, secondary, tertiary and quaternary denitrification sub-apparatuses.

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