CN111620500A - Ammonia stripping process and device for high-concentration ammonia nitrogen wastewater - Google Patents
Ammonia stripping process and device for high-concentration ammonia nitrogen wastewater Download PDFInfo
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- CN111620500A CN111620500A CN202010422352.1A CN202010422352A CN111620500A CN 111620500 A CN111620500 A CN 111620500A CN 202010422352 A CN202010422352 A CN 202010422352A CN 111620500 A CN111620500 A CN 111620500A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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Abstract
An ammonia stripping process for high-concentration ammonia nitrogen wastewater comprises a pH adjusting tank, a sedimentation tank, a heating tank, a deamination fan, a cyclone separator, a pH adjusting tank and an ammonia absorption tower. Through adjusting pH and temperature to intaking, create the best ammonia and blow off the condition, the sedimentation tank sets up the mud backward flow, has practiced thrift the quantity of alkali, and it atomizes under the effect of high-speed rotatory impeller in deamination fan to intake water, and the air is fully violently collided the mixture, and free ammonia in aquatic changes into gaseous phase entering air from the liquid phase and separates with water in cyclone, and the device gas-water mixture is effectual, and deamination is efficient, and the energy consumption is low. Ammonia gas generated in the wastewater treatment process is absorbed by clear water in an ammonia absorption tower to generate dilute ammonia water, so that the dilute ammonia water is recycled, resources are saved, and secondary pollution is avoided.
Description
Technical Field
The invention relates to the technical field of high-concentration ammonia nitrogen wastewater treatment, in particular to an ammonia stripping process for high-concentration ammonia nitrogen wastewater and an ammonia stripping device for high-concentration ammonia nitrogen wastewater.
Background
At present, the ammonia nitrogen removal of high-concentration ammonia nitrogen wastewater is a difficult problem in current wastewater treatment, currently, ammonia stripping mainly adopts an ammonia stripping tower, wastewater with pH adjusted enters from a water distributor at the upper part of the ammonia stripping tower, air enters from the lower part of the ammonia stripping tower under the action of a fan, the wastewater and the air reversely flow in the ammonia stripping tower, a packing layer at the middle part of the ammonia stripping tower is contacted for mass transfer, ammonia enters from a liquid phase into a gas phase and is blown out from the top of the ammonia stripping tower along with the air, and the wastewater with ammonia removed is discharged from the bottom of the ammonia stripping tower. The filler in the ammonia stripping tower is easy to scale and block, needs to be cleaned frequently, and has small gas-liquid mass transfer area, low ammonia stripping efficiency, large air volume of a blower and high energy consumption.
Disclosure of Invention
The invention aims to provide an ammonia stripping process and device for high-concentration ammonia nitrogen wastewater, aiming at the problems of easy scaling and blockage of fillers, low ammonia stripping efficiency and high energy consumption in the traditional ammonia stripping technology, so that the ammonia stripping efficiency is greatly improved, the energy consumption is saved, and the operation cost is reduced.
Technical scheme
The ammonia nitrogen in the wastewater is mainly ammonia ion (NH)4 +) And free ammonia (NH)3) Two forms exist, which are mutually transformed to keep an equilibrium state, and the reaction equation is as follows:
NH4++OH-＝NH3+H2O
the reaction is endothermic, and the two factors of pH and temperature are the main factors influencing the equilibrium relationship. When pH is 10, the ammonia nitrogen in the water is mainly NH3The ammonia nitrogen can be blown off by a blowing-off method. The higher reaction temperature is favorable for increasing the diffusion capacity of free ammonia in water, and can reduce the solubility of ammonia in water and improve the transfer capacity of ammonia to air. Under the conditions that the pH value of the wastewater is 11 and the temperature is 30 ℃, the ammonia nitrogen removal efficiency can reach more than 98 percent.
The invention provides an ammonia stripping process for high-concentration ammonia nitrogen wastewater, which is characterized by comprising the following steps of:
firstly, high-concentration ammonia nitrogen wastewater enters a pH adjusting tank, and alkali is added into the pH adjusting tank to adjust the pH value of the wastewater.
And secondly, the effluent of the pH adjusting tank enters a sedimentation tank for mud-water separation to obtain supernatant and precipitated sludge.
And thirdly, heating and raising the temperature of the supernatant in the sedimentation tank in a heating tank, refluxing a sludge part in the sedimentation tank to the pH regulating tank, and discharging the rest part.
And fourthly, enabling the water discharged from the heating tank to enter a deamination fan, simultaneously enabling the water to enter air of the deamination fan, violently stirring and mixing the water and the air in the deamination fan to form an air-water mixture, then enabling the mixture to enter a cyclone separator to be separated into gas and water, and enabling the waste gas generated by the heating tank to enter an ammonia absorption tower.
Fifthly, enabling the effluent of the cyclone separator to enter a pH adjusting tank, adding acid into the pH adjusting tank to adjust the pH value, and enabling the waste gas of the cyclone separator to enter an ammonia absorption tower.
Further, the pH value of the effluent is finally controlled to be 10-12 by the pH regulation of the pH regulation pool in the first step, the effluent temperature is finally controlled to be 25-40 ℃ by heating the heating tank in the third step, and the heating medium of the heating tank adopts heat conduction oil; and the air-water ratio of the inlet air and the inlet water of the deamination fan in the fourth step is controlled to be 1000-2500: 1, the wind pressure is 1000-5000 Pa; and the pH value of the effluent is adjusted back to the tank in the fifth step to be controlled between 6 and 9, and the ammonia absorption liquid of the ammonia absorption tower adopts clear water.
A device that is used for above-mentioned high concentration ammonia nitrogen waste water's ammonia to blow off technology, its characterized in that: it includes heating jar, deamination fan, cyclone and ammonia absorption tower, and the heating jar is equipped with the elevator pump with the pipe connection with deamination fan with pipe connection, heating jar exhaust end and cyclone exhaust end with ammonia absorption tower with pipe connection, be equipped with the draught fan on the connecting tube.
Further, the heating tank comprises an inner tank body and an outer tank body, heating medium heat conduction oil is filled between the inner tank body and the outer tank body, and an electric heating pipe is arranged between the inner tank body and the outer tank body. The inner tank body is internally provided with a stirrer, and the outer tank body is externally provided with a heat-insulating layer.
Furthermore, a clear water distributor is arranged at the upper end inside the ammonia absorption tower, filler is arranged below the clear water distributor, a demister is arranged above the clear water distributor, and the clear water inlet end of the ammonia absorption tower is connected with a clear water pump through a pipeline.
Advantageous effects
Through adjusting pH and temperature to intaking, create the best ammonia and blow off the condition, the sedimentation tank sets up the mud backward flow, has practiced thrift the quantity of alkali, and it atomizes under the effect of high-speed rotatory impeller in deamination fan to intake water, and the air is fully violently collided the mixture, and free ammonia in aquatic changes into gaseous phase entering air from the liquid phase and separates with water in cyclone, and the device gas-water mixture is effectual, and deamination is efficient, and the energy consumption is low. Ammonia gas generated in the wastewater treatment process is absorbed by clear water in an ammonia absorption tower to generate dilute ammonia water, so that the dilute ammonia water is recycled, resources are saved, and secondary pollution is avoided.
Drawings
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a schematic diagram of the structure of the device of the present invention.
Detailed Description
The invention is further explained below with reference to the figures and examples.
Example 1
As shown in the attached figure 1, the ammonia stripping process of the high-concentration ammonia nitrogen wastewater is characterized by comprising the following steps: (1) and (4) allowing the high ammonia nitrogen wastewater to enter a pH adjusting tank, and adding alkali into the pH adjusting tank to adjust the pH value of the wastewater. (2) And (4) enabling the effluent of the pH adjusting tank to enter a sedimentation tank for mud-water separation to obtain supernatant and precipitated sludge. (3) And (4) heating and raising the temperature of supernatant in the sedimentation tank in a heating tank, refluxing a sludge part in the sedimentation tank to the pH regulating tank, and discharging the rest part. (4) The water from the heating tank enters a deamination fan, and air in the deamination fan is vigorously stirred and mixed in the deamination fan to form an air-water mixture, and then the mixture enters a cyclone separator to be separated into air and water. The exhaust gas generated by the heating tank enters the ammonia absorption tower. (5) And (4) enabling the effluent of the cyclone separator to enter a pH value adjusting tank, and adding acid into the pH value adjusting tank to adjust the pH value. The cyclone waste gas enters an ammonia absorption tower.
The pH value of the effluent is finally controlled to be 10-12 by the pH regulation of the pH regulation pool, the effluent temperature is finally controlled to be 25-40 ℃ by the heating tank for heating, and the heating medium of the heating tank adopts heat conduction oil; the air-water ratio of the inlet air and the inlet water of the deamination fan is controlled to be 1000-2500: 1, the wind pressure is 1000-5000 Pa; and controlling the pH value of the effluent to be 6-9 by using a pH adjusting tank, and adopting clear water as ammonia absorption liquid of the ammonia absorption tower.
Example 2
The utility model provides an ammonia of high concentration ammonia nitrogen waste water blows and takes off device, it includes heating jar 1, deamination fan 2, cyclone 3 and ammonia absorption tower 4, heating jar 1 with deamination fan 2 with the pipe connection, be equipped with elevator pump 19 on the connecting tube, deamination fan 2 with cyclone 3 with the pipe connection, heating jar 1 exhaust end and 3 exhaust ends of cyclone and ammonia absorption tower 4 with the pipe connection, be equipped with draught fan 41 on the connecting tube.
The heating tank 1 comprises an inner tank body 12 and an outer tank body 13, heating medium heat conduction oil 15 is filled between the inner tank body 12 and the outer tank body 13, an electric heating pipe 16 is arranged, a stirrer 17 is arranged on the inner tank body 12, and a heat insulation layer 18 is arranged outside the outer tank body 14.
The upper end in the ammonia absorption tower 4 is provided with a clear water distributor 42, the lower part of the clear water distributor 42 is provided with a filler 43, the upper part is provided with a demister 45, and the clear water inlet end of the ammonia absorption tower 4 is connected with a clear water pump 44 through a pipeline.
Through adjusting pH and temperature to intaking, create the best ammonia and blow off the condition, the sedimentation tank sets up the mud backward flow, has practiced thrift the quantity of alkali, and it atomizes under the effect of high-speed rotatory impeller in deamination fan to intake water, and the air is fully violently collided the mixture, and free ammonia in aquatic changes into gaseous phase entering air from the liquid phase and separates with water in cyclone, and the device gas-water mixture is effectual, and deamination is efficient, and the energy consumption is low. Ammonia gas generated in the wastewater treatment process is absorbed by clear water in an ammonia absorption tower to generate dilute ammonia water, so that the dilute ammonia water is recycled, resources are saved, and secondary pollution is avoided.
Claims (5)
1. An ammonia stripping process for high-concentration ammonia nitrogen wastewater is characterized by comprising the following steps:
(1) the high-concentration ammonia nitrogen wastewater enters a pH adjusting tank, and alkali is added into the pH adjusting tank to adjust the pH value of the wastewater;
(2) the effluent of the pH adjusting tank enters a sedimentation tank for mud-water separation to obtain supernatant and precipitated sludge;
(3) heating the supernatant in the sedimentation tank in a heating tank, returning part of sludge in the sedimentation tank to the pH regulating tank, and discharging the rest part of sludge;
(4) the water from the heating tank enters a deamination fan, and simultaneously air and water entering the deamination fan are vigorously stirred and mixed in the deamination fan to form an air-water mixture, then the mixture enters a cyclone separator to be separated into air and water, and the waste gas generated by the heating tank enters an ammonia absorption tower;
(5) and (3) enabling the effluent of the cyclone separator to enter a pH adjusting tank, adding acid into the pH adjusting tank to adjust the pH value, and enabling the waste gas generated by the cyclone separator to enter an ammonia absorption tower.
2. The ammonia stripping process of the high-concentration ammonia-nitrogen wastewater as claimed in claim 1, characterized in that:
the pH value of the effluent is finally controlled to be 10-12 by the pH regulation of the pH regulation pool in the step 1, the effluent temperature is finally controlled to be 25-40 ℃ by heating the heating tank in the step 3, and the heating medium of the heating tank adopts heat conducting oil; the air-water ratio of the inlet air and the inlet water of the deamination fan in the step 4 is controlled to be 1000-2500: 1, and the air pressure is 1000-5000 Pa; and 5, adjusting the pH value of the effluent to be 6-9 by the pH adjusting tank, and adopting clear water as ammonia absorption liquid of the ammonia absorption tower.
3. The utility model provides an ammonia of high concentration ammonia nitrogen waste water blows takes off device which characterized in that: it includes heating jar 1, deamination fan 2, cyclone 3 and ammonia absorption tower 4, heating jar 1 with deamination fan 2 is equipped with elevator pump 19 with the pipe connection on the connecting tube, deamination fan 2 with cyclone 3 is with the pipe connection, heating jar 1 exhaust end with 3 exhaust ends of cyclone and ammonia absorption tower 4 with the pipe connection, be equipped with draught fan 41 on the connecting tube.
4. The heating tank 1 according to claim 3 comprises an inner tank 12 and an outer tank 13, wherein the heating medium heat conducting oil 15 is filled between the inner tank 12 and the outer tank 13 and an electric heating pipe 16 is arranged, a stirrer 17 is arranged in the inner tank 12, and an insulating layer 18 is arranged outside the outer tank 14.
5. The ammonia absorption tower 4 according to claim 3, wherein a clean water distributor 42 is provided at the upper end of the interior of the tower 4, a packing 43 is provided below the clean water distributor 42, a demister 45 is provided above the clean water distributor 42, and the clean water inlet end of the tower 4 is connected to a clean water pump 44 through a pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010422352.1A CN111620500A (en) | 2020-05-12 | 2020-05-12 | Ammonia stripping process and device for high-concentration ammonia nitrogen wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010422352.1A CN111620500A (en) | 2020-05-12 | 2020-05-12 | Ammonia stripping process and device for high-concentration ammonia nitrogen wastewater |
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| CN111620500A true CN111620500A (en) | 2020-09-04 |
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| CN202010422352.1A Pending CN111620500A (en) | 2020-05-12 | 2020-05-12 | Ammonia stripping process and device for high-concentration ammonia nitrogen wastewater |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112573607A (en) * | 2020-12-11 | 2021-03-30 | 华东理工大学 | Device and method for recycling ammonia nitrogen in urine through hydraulic cyclone |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103043809A (en) * | 2012-12-14 | 2013-04-17 | 南京中创水务集团股份有限公司 | Cyclone stripping integration ammonia removal reaction tower |
| CN104986899A (en) * | 2015-07-27 | 2015-10-21 | 广州华浩能源环保集团有限公司 | High-concentration ammonia-nitrogen wastewater ammonia stripping and resourceful treatment system and treatment method |
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2020
- 2020-05-12 CN CN202010422352.1A patent/CN111620500A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103043809A (en) * | 2012-12-14 | 2013-04-17 | 南京中创水务集团股份有限公司 | Cyclone stripping integration ammonia removal reaction tower |
| CN104986899A (en) * | 2015-07-27 | 2015-10-21 | 广州华浩能源环保集团有限公司 | High-concentration ammonia-nitrogen wastewater ammonia stripping and resourceful treatment system and treatment method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112573607A (en) * | 2020-12-11 | 2021-03-30 | 华东理工大学 | Device and method for recycling ammonia nitrogen in urine through hydraulic cyclone |
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