CN216890496U - High COD, high ammonia nitrogen, high salt effluent disposal system that contains - Google Patents
High COD, high ammonia nitrogen, high salt effluent disposal system that contains Download PDFInfo
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- CN216890496U CN216890496U CN202220307300.4U CN202220307300U CN216890496U CN 216890496 U CN216890496 U CN 216890496U CN 202220307300 U CN202220307300 U CN 202220307300U CN 216890496 U CN216890496 U CN 216890496U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The utility model discloses a high-COD, high-ammonia nitrogen and high-salt-content wastewater treatment system, which comprises a raw water collecting tank, an integrated Fenton oxidation tower, a primary pH adjusting device, a filter pressing device, a three-phase catalytic oxidation tower, an evaporation device, a secondary pH adjusting device, an ammonia nitrogen stripping tower and an ammonia nitrogen absorption tower which are sequentially arranged; the devices are communicated through a water outlet pipe; and a water inlet pipe of the integrated Fenton oxidation tower is communicated with a raw water collecting tank for placing sewage. The waste water treatment system reduces the waste treatment cost, and the treatment cost is reduced to 1400 yuan/ton from 2400 yuan/ton; the process operation flow of the wastewater treatment system is optimized and simplified, ammonia water generated during ammonia nitrogen removal can be effectively utilized, the treated wastewater has low COD, ammonia nitrogen and salt content indexes, the subsequent wastewater treatment difficulty is reduced, and the wastewater treatment pressure is relieved.
Description
Technical Field
The utility model relates to the technical field of sewage treatment, in particular to a high-COD, high-ammonia nitrogen and high-salt-content wastewater treatment system.
Background
Along with the development of the organic chemical industry and the improvement of the refinement rate, the production amount of waste liquid with high Chemical Oxygen Demand (COD), high ammonia nitrogen and high salt content is continuously increased, the waste liquid generally contains very low heat value, if the waste liquid is treated by adopting an incineration mode, the treatment cost is higher, and the energy waste is more caused. The current domestic common treatment mode generally adopts Fenton reagent oxidation treatment to reduce COD of waste liquid, and the treatment process flow is shown in figure 1, and specifically comprises the following steps: 1) firstly, adding alkali liquor into the waste liquor, adjusting the pH value of the waste liquor to about 8.0-9.0, and if precipitation is generated, adding PAC (polyaluminium chloride) and PAM (polyacrylamide) for flocculation precipitation; 2) adjusting the pH value of the supernatant to 3.0, adding quantitative hydrogen peroxide and ferrous salt (Fenton oxidation), adjusting the pH value of the waste liquid to be neutral after mixing reaction for 2 hours, and then entering a sedimentation tank for mud-water separation.
The prior art has the following problems in the treatment process flow: 1) after Fenton oxidation is carried out on the high-COD, high-ammonia-nitrogen and high-salt-content wastewater, the removal rate of COD is about 40%, and the COD is still very high; 2) the treatment effect is unstable, and a large amount of medicament needs to be wasted; 3) the removal rate of ammonia nitrogen in the treated supernatant is very low, and the treated supernatant cannot meet the index of entering a sewage station, so that the ammonia nitrogen index of the sewage station is likely to exceed the standard; 4) the salt content of the treated supernatant is high, and the subsequent treatment can increase the salt content of the sewage station, so that the normal survival of sludge is not facilitated, and the paralysis of a biochemical system of the sewage station is likely to be caused; 5) the subsequent wastewater treatment process is complex, the treatment difficulty is increased, and the treatment cost is high.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects in the prior art and provide a high-COD, high-ammonia nitrogen and high-salt-content wastewater treatment system.
The purpose of the utility model is realized by the following technical scheme: a high COD, high ammonia nitrogen and high salt content wastewater treatment system comprises a raw water collecting tank, an integrated Fenton oxidation tower, a primary pH adjusting device, a filter pressing device, a three-phase catalytic oxidation tower, an evaporation device, a secondary pH adjusting device, an ammonia nitrogen stripping tower and an ammonia nitrogen absorption tower which are sequentially arranged; the devices are communicated through a water outlet pipe; and a water inlet pipe of the integrated Fenton oxidation tower is communicated with a raw water collecting tank for placing sewage.
Preferably, the integrated Fenton oxidation tower comprises a water inlet device, an electric heating device, a dosing device and a sludge tank; wherein, the water inlet device comprises a water inlet pipeline positioned at the top of the oxidation tower and a water distribution device communicated with the water inlet pipeline; the water distribution device comprises a main pipe and a plurality of branch pipes communicated with the main pipe, and the branch pipes are provided with water spray holes; the electric heating device is positioned below the water distribution device; the dosing devices comprise a hydrogen peroxide dosing device, a ferrous sulfate dosing device, a sulfuric acid dosing device, a PAC dosing device, a PAM dosing device and a defoaming agent dosing device, are positioned outside the integrated Fenton oxidation tower and are connected with the integrated Fenton oxidation tower through dosing pipelines; the sludge box is communicated with the integrated Fenton oxidation tower body through a pipeline.
Preferably, the first-stage pH adjusting device comprises a first-stage pH adjusting water tank communicated with the integrated fenton oxidation tower and a caustic soda liquid dosing device for adding caustic soda liquid into the first-stage pH adjusting water tank through a dosing pipeline.
Preferably, the filter pressing device is a plate-and-frame filter press.
Preferably, the three-phase catalytic oxidation tower is communicated with the filter pressing device and the hydrogen peroxide dosing device.
Preferably, the evaporation device comprises an evaporation water inlet tank and an evaporation system which are communicated with the three-phase catalytic oxidation tower.
Preferably, the secondary pH adjusting device comprises a secondary pH adjusting water tank communicated with the evaporation device and a caustic soda liquid dosing device for adding caustic soda liquid into the secondary pH adjusting water tank.
Compared with the prior art, the utility model has the following beneficial effects:
1. the waste water treatment system reduces the waste treatment cost from 2400 yuan/ton to 1400 yuan/ton, thereby greatly saving the cost.
2. The wastewater treatment system provided by the utility model is used for treating wastewater with high COD, high ammonia nitrogen and high salt content, the technological operation process is optimized and simplified, and ammonia water generated in ammonia nitrogen removal can be effectively utilized.
3. The wastewater treated by the wastewater treatment system disclosed by the utility model has low indexes of COD, ammonia nitrogen and salt, the subsequent wastewater treatment difficulty is reduced, and the wastewater treatment pressure is relieved.
Drawings
FIG. 1 is a flow chart of a treatment process commonly used in China at present.
FIG. 2 is a schematic diagram of the high COD, high ammonia nitrogen and high salt content wastewater treatment system of the present invention; the system comprises a raw water collecting tank 1, an integrated Fenton oxidation tower 2, a ferrous sulfate dosing device 3, a PAC dosing device 4, a PAM dosing device 5, a sulfuric acid dosing device 6, a defoaming agent dosing device 7, a hydrogen peroxide dosing device 8, a liquid caustic soda dosing device 9, a sludge tank 10, an electric heating device 11, a primary pH adjusting water tank 12, a plate and frame filter press 13, a three-phase catalytic oxidation tower 14, an evaporation water inlet tank 15, an evaporation system 16, a liquid caustic soda dosing device 17, a secondary pH adjusting water tank 18, an ammonia nitrogen stripping tower 19 and an ammonia nitrogen absorption tower 20.
FIG. 3 is a schematic view of a process for wastewater treatment using the wastewater treatment system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A high COD, high ammonia nitrogen and high salt content wastewater treatment system is structurally shown in figure 1 and comprises a raw water collecting tank 1, an integrated Fenton oxidation tower 2, a primary pH adjusting device, a plate-and-frame filter press 13, a three-phase catalytic oxidation tower 14, an evaporation device, a secondary pH adjusting device, an ammonia nitrogen stripping tower 19 and an ammonia nitrogen absorption tower 20; the devices are communicated through a water outlet pipe. The water inlet pipe of the integrated Fenton oxidation tower 2 is communicated with a raw water collecting tank 1 for placing sewage. The integrated Fenton oxidation tower 2 comprises a water inlet device, an electric heating device 11, a dosing device and a sludge box 10; the water inlet device comprises a water inlet pipeline positioned at the top of the oxidation tower and a water distribution device communicated with the water inlet pipeline; the water distribution device comprises a main pipe and a plurality of branch pipes communicated with the main pipe, and the branch pipes are provided with water spray holes; the electric heating device 11 is positioned below the water distribution device; the dosing devices comprise a ferrous sulfate dosing device 3, a PAC dosing device 4, a PAM dosing device 5, a sulfuric acid dosing device 6, a defoaming agent dosing device 7 and a hydrogen peroxide dosing device 8; the sludge box 10 is communicated with the integrated Fenton oxidation tower body through a pipeline; the primary pH adjusting device comprises a primary pH adjusting water tank 12 communicated with the integrated Fenton oxidation tower 1 and a liquid caustic soda dosing device 9 used for adding liquid caustic soda into the primary pH adjusting water tank 12; the three-phase catalytic oxidation tower 14 is communicated with a hydrogen peroxide dosing device 8; the evaporation device comprises an evaporation water inlet tank 15 and an evaporation system 16 which are communicated with the three-phase catalytic oxidation tower 14; the secondary pH adjusting device comprises a secondary pH adjusting water tank 18 communicated with the evaporation device and a liquid caustic soda dosing device 17 used for adding liquid caustic soda into the secondary pH adjusting water tank 18; the ammonia nitrogen stripping tower 19 is respectively communicated with a secondary pH adjusting water tank 18 and an ammonia nitrogen absorption tower 20.
The wastewater treatment system in the embodiment is adopted to treat wastewater with high COD, high ammonia nitrogen and high salt content, and the method comprises the following steps: introducing wastewater into a raw water collecting tank 1 in a wastewater treatment system to uniformly collect wastewater, then introducing the wastewater into an integrated Fenton oxidation tower 2, adding a sulfuric acid solution (with the concentration of 30%) into a sulfuric acid dosing device 6 to adjust the pH value of the wastewater to 3, adding ferrous sulfate dosing device 3 and a hydrogen peroxide dosing device 8 into ferrous sulfate heptahydrate (with the purity of 90%) with the weight of 1% of the wastewater, adding a hydrogen peroxide solution (with the concentration of 30%) with the weight of 2% of the wastewater, performing Fenton oxidation at 50 ℃ for 4 hours, adding PAC (with the purity of 30%) with the weight of 8% of the wastewater and PAM (with the purity of 95%) with the weight of 0.1% of the wastewater into the wastewater subjected to Fenton oxidation in the integrated Fenton oxidation tower 2 by using a PAC dosing device 4 and a PAM dosing device 5, performing defoaming by using a dosing defoaming agent device 7 and defoaming agents, the amount is adjusted according to the foam generation condition. The wastewater enters a primary pH adjusting water tank 12, liquid caustic soda (with the concentration of 30%) is added into the primary pH adjusting water tank 12 through a liquid caustic soda dosing device 9, the pH value is adjusted to 6, then the pH value is subjected to plate-and-frame filter pressing through a plate-and-frame filter press 13, filtrate enters a three-phase catalytic oxidation tower 14, and hydrogen peroxide (with the concentration of 30%) with the weight of the filtrate is added through a hydrogen peroxide dosing device 8 for catalytic oxidation for 4 hours. The waste liquid enters an evaporation water inlet tank 15 to balance the water quantity, then enters an evaporation system 16 to be evaporated and desalted, the distillate enters a secondary pH adjusting water tank 18 in a secondary pH adjusting device, a liquid caustic soda dosing device 17 adds liquid caustic soda into the secondary pH adjusting water tank 18 to adjust the pH value to 10, then enters an ammonia nitrogen stripping tower 19 to be stripped at 50 ℃ for 4 hours, the ammonia gas separated by stripping passes through an ammonia gas absorption tower 20, and the ammonia water is recovered by rinsing with clear water. The effluent of the ammonia nitrogen stripping tower 19 is treated wastewater. The wastewater treatment system is adopted to perform wastewater treatment for 3 times.
The results of the detection of the pollutants in the wastewater before and after the treatment are shown in Table 1. The result shows that after treatment, the COD, ammonia nitrogen and salt content of pollutants in the wastewater are obviously reduced, the subsequent sewage treatment difficulty is reduced, and the sewage treatment pressure is relieved.
The use of the wastewater treatment agents is shown in Table 2. The floor area of the wastewater disposal system adopted in the embodiment is 100m2The total electric power is 15kw, the consumption of tap water is about 3t/d, and the device is used for dispensing and filling and washing the ammonia nitrogen absorption tower. The operation time per day was 20 hours, the design water amount was 0.5 ton/hour, and the water amount per day was 10 ton/day. The results show that the method reduces the treatment cost of the wastewater, and the treatment cost is reduced to 1400 yuan/ton from 2400 yuan/ton.
TABLE 1 results of contaminant detection before and after treatment
TABLE 2 drug use cases
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the utility model.
Claims (7)
1. A high COD, high ammonia nitrogen and high salt content wastewater treatment system is characterized by comprising a raw water collecting tank, an integrated Fenton oxidation tower, a primary pH adjusting device, a filter pressing device, a three-phase catalytic oxidation tower, an evaporation device, a secondary pH adjusting device, an ammonia nitrogen stripping tower and an ammonia nitrogen absorption tower which are sequentially arranged; the devices are communicated through a water outlet pipe; and a water inlet pipe of the integrated Fenton oxidation tower is communicated with a raw water collecting tank for placing sewage.
2. The high-COD, high-ammonia-nitrogen and high-salt-content wastewater treatment system according to claim 1, wherein the integrated Fenton oxidation tower comprises a water inlet device, an electric heating device, a chemical adding device and a sludge tank; wherein the dosing device comprises a hydrogen peroxide dosing device, a ferrous sulfate dosing device, a sulfuric acid dosing device, a PAC dosing device, a PAM dosing device and a defoaming agent dosing device, which are all positioned outside the integrated Fenton oxidation tower and are connected with the integrated Fenton oxidation tower through dosing pipelines; the sludge box is communicated with the integrated Fenton oxidation tower body through a pipeline.
3. The high COD, high ammonia nitrogen and high salt content wastewater treatment system according to claim 1, wherein the primary pH adjusting device comprises a primary pH adjusting water tank communicated with the integrated Fenton oxidation tower and a liquid caustic soda dosing device for adding liquid caustic soda into the primary pH adjusting water tank through a dosing pipeline.
4. The high COD, high ammonia nitrogen and high salt content wastewater treatment system according to claim 1, wherein the filter pressing device is a plate-and-frame filter press.
5. The high COD, high ammonia nitrogen and high salt content wastewater treatment system according to claim 1, wherein the three-phase catalytic oxidation tower is communicated with the filter pressing device and the hydrogen peroxide feeding device.
6. The high COD, high ammonia nitrogen and high salt content wastewater treatment system according to claim 1, wherein the evaporation device comprises an evaporation water inlet tank and an evaporation system which are communicated with the three-phase catalytic oxidation tower.
7. The high COD, high ammonia nitrogen and high salt content wastewater treatment system according to claim 1, wherein the secondary pH adjusting device comprises a secondary pH adjusting water tank communicated with the evaporation device and a liquid alkali dosing device for adding liquid alkali into the secondary pH adjusting water tank.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220307300.4U CN216890496U (en) | 2022-02-15 | 2022-02-15 | High COD, high ammonia nitrogen, high salt effluent disposal system that contains |
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| CN202220307300.4U CN216890496U (en) | 2022-02-15 | 2022-02-15 | High COD, high ammonia nitrogen, high salt effluent disposal system that contains |
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