CN212403836U - Treatment system for activated carbon desulfurization and denitrification acid-making wastewater - Google Patents
Treatment system for activated carbon desulfurization and denitrification acid-making wastewater Download PDFInfo
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Abstract
The utility model provides a processing system of active carbon SOx/NOx control system acid waste water, this processing system includes: a sludge concentration device, a chemical precipitation hardness removal device, an electronic flocculation device, a clarification and precipitation device, a membrane treatment device and an evaporation device; when the treatment system works, firstly, acid-making wastewater is introduced into a sludge concentration device to be stirred and concentrated; then introducing the acid-making wastewater into a chemical precipitation hardness-removing device, adding alkali liquor and a hardness-removing agent, stirring, reacting and precipitating; then the acid-making wastewater is sequentially introduced into an electronic flocculation device and a clarification and precipitation device for precipitation; then introducing the acid-making wastewater into a membrane treatment device to further remove suspended matters; finally, adding alkali liquor into the acid-making wastewater and evaporating to obtain crystallized salt and ammonia-containing gas. The treatment system can effectively treat the wastewater generated in the acid production by desulfurization and denitrification of the activated carbon, and remove various harmful substances in the wastewater generated in the acid production step by step.
Description
Technical Field
The utility model relates to an industrial wastewater treatment technical field, it is specific, relate to a processing system of active carbon SOx/NOx control system acid waste water.
Background
The flue gas purification technology of activated carbon desulfurization and denitrification has become one of the flue gas purification technologies with the most extensive application of steel smelting and ultralow emission by virtue of the advantages of synchronous realization of desulfurization, denitrification, dust removal, heavy metal removal and dioxin removal, and is widely accepted in the environmental management industry.
The desulfurization and denitrification purification process of the active carbon utilizes the principle of active carbon adsorption to recover SO in flue gas2And is used for preparing sulfuric acid. In the utilization of SO2In the process of preparing industrial sulfuric acid, acidic waste water is generated. The source of the acid wastewater is a purification section of an acid making process, in the process of washing high-temperature decomposition gas by using 3-5% dilute sulfuric acid, impurities and harmful components in the flue gas enter the dilute sulfuric acid through gas-liquid two-phase contact, the part of dilute sulfuric acid is subjected to solid-liquid separation by an inclined plate clarifier, the bottom waste acid is the acid wastewater, the part of the acid wastewater is influenced by the impurity components in the flue gas, the water quality components are complex, the water quality index fluctuation is large, if the part of the acid wastewater is directly discharged, impact is caused on a downstream sewage treatment station, and secondary pollution is further caused. Therefore, appropriate approaches must be taken for comprehensive utilization or effective remedial measures.
Through water quality index tests and researches, the acidic wastewater mainly contains active carbon coke powder suspended matters, heavy metal ions, high fluoride ions, high chloride ions, high ammonia nitrogen, sulfate ions, COD and other complex factors, and the specific water quality references are as follows: 0-1 pH value, 1000-20000 mg/L ammonia nitrogen, 200-500 mg/L hardness, 300-2000 mg/L suspended matter, 500-3000 mg/L fluoride, 30-100 g/L chloride ion, 500-3000 mg/L COD, 100-200 g/L salt content. At present, the main treatment process of the acid-making wastewater has no identifiable mature technology at home and abroad and no case and experience of stable operation in engineering.
The acid-making wastewater meets the direct discharge standard in the discharge standard of pollutants for water in the iron and steel industry (GB 13456-2012), but the pollution factors of the wastewater are complex and have high concentration, so that the acid-making wastewater treatment system does not operate well at present and can hardly reach the standard. A large amount of complex factors such as fluoride ions, chloride ions, ammonia nitrogen, sulfate ions, COD and the like are enriched in the wastewater, and the wastewater has strong corrosivity, so that the wastewater is difficult to recycle. Therefore, how to treat and recycle the acid-making wastewater economically and effectively needs to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve above-mentioned technical problem and make, its purpose provides a processing system of active carbon SOx/NOx control system acid waste water, can handle and recycle effectively the active carbon SOx/NOx control system acid waste water, realizes the zero release of system acid waste water.
In order to achieve the above object, the utility model provides a processing system of active carbon SOx/NOx control system acid waste water, processing system includes:
the sludge concentration device is used for carrying out concentration and precipitation on the acid-making wastewater;
the chemical precipitation hardness removal device is communicated with the sludge concentration device and is used for reducing the hardness of the acid making wastewater;
the electronic flocculation device is communicated with the chemical precipitation hardness removal device and is used for accelerating the precipitation of suspended matters in the acid-making wastewater;
the clarification and sedimentation device is communicated with the electronic flocculation device and is used for settling suspended matters in the acid-making wastewater;
the membrane treatment device is communicated with the clarification and precipitation device and is used for removing suspended matters in the acid-making wastewater;
and the evaporation device is communicated with the membrane treatment device and is used for carrying out evaporation crystallization on the acid making wastewater.
Preferably, the treatment system further comprises an atomization device arranged between the membrane treatment device and the evaporation device, and the atomization device is used for atomizing and spraying the acid-making wastewater into the evaporation device;
the evaporation device is a bypass flue, high-temperature flue gas generated in steel sintering or pelletizing or blast furnace or coking is introduced into one end of the bypass flue and used as a heat source to evaporate the acid making wastewater sprayed into the evaporation device, and a dust remover is connected to the other end of the bypass flue to obtain crystal salt generated by crystallization of the acid making wastewater.
Preferably, the exhaust end of the dust remover is connected with an activated carbon flue gas denitration system so as to introduce the ammonia-containing gas in the dust remover into the activated carbon flue gas denitration system.
Preferably, a sludge dewatering device is connected to the sewage outlet of the sludge concentration device and/or the sewage outlet of the chemical precipitation hardness removal device and/or the sewage outlet of the clarification and precipitation device.
Preferably, the sludge concentration device, the chemical precipitation hardness removal device, the electronic flocculation device and the clarification and sedimentation device are all closed devices.
Preferably, a transmission device is further arranged in the sludge concentration device and used for conveying sediment formed by the acid-making wastewater to the bottom of the sludge concentration device.
According to above-mentioned description and practice can know, active carbon SOx/NOx control system acid wastewater's processing system, at first utilize sludge concentration device, get rid of the concentrated sediment of active carbon powder in the waste water, the medicine volume when both having reduced the suspended solid in the follow-up processing waste water, alleviate the operation burden of follow-up waste water treatment equipment to the suspended solid index again. Then adding alkali liquor and a hardness removing agent into the chemical precipitation hardness removing device, and under the alkaline condition, not only can effectively remove the hardness of calcium and magnesium, but also can effectively remove heavy metal ions in the wastewater. Additionally, the utility model discloses an electron flocculation technique, this processing technology have and do not receive waste water quality of water change to influence, and need not add any water treatment medicament, have that the precipitate production is few, and advantages such as operation stability realize sparingly throwing the cost of adding the medicament and the purpose of manual maintenance expense.
On the other hand, the utility model discloses in the course of the treatment and after finishing, the ammonia that will generate and the ammonia gas that contains have introduced active carbon flue gas denitration system recycle. The overflow of volatile ammonia gas in the wastewater treatment process can be effectively reduced, and the ammonia nitrogen in the wastewater is recovered to the maximum extent.
Furthermore, the utility model discloses an atomizing device adds evaporation plant, not only the degree of depth has utilized flue gas waste heat, still possesses performances such as desorption sulfur trioxide and heavy metal mercury simultaneously to can reduce the entry gas temperature of desulfurization main system absorption tower, reduce the emergence that unusual high temperature phenomenon took place in desulfurization main system absorption tower, also have the flue gas and disappear white efficiency simultaneously.
Drawings
Fig. 1 is a schematic structural diagram of a treatment system for wastewater from desulfurization and denitrification with activated carbon for acid production according to an embodiment of the present invention.
In the figure: 1. sludge concentration device, 2, chemical precipitation removes hardness device, 3, electron flocculation device, 4, clarification sediment device, 5, membrane processing apparatus, 6, atomizing device, 7, evaporation plant, 8, dust remover, 9, activated carbon flue gas denitration system, 10, ammonia station, 11, sludge dewatering device, 12, system sour system.
Detailed Description
In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details. The utility model provides a processing system of sour waste water of active carbon SOx/NOx control system can purify system sour waste water to active burnt flue gas and handle and recycle effectively, realizes the zero release of system sour waste water.
Fig. 1 is a schematic structural diagram of a treatment system for wastewater from desulfurization and denitrification with activated carbon for acid production according to an embodiment of the present invention.
Referring to fig. 1, in this embodiment, a treatment system for activated coke flue gas purification acid-making wastewater is provided, which is used for treating the activated coke flue gas purification acid-making wastewater. The processing system comprises: the sludge concentration device 1, the chemical precipitation hardness removal device 2, the electronic flocculation device 3, the clarification and precipitation device 4, the membrane treatment device 5, the atomization device 6, the evaporation plant 7 and the dust remover 8 which are connected in sequence.
The import of sludge concentration device 1, sludge concentration device 1's export and chemical precipitation remove 2 access connections of hardness device, the chemical precipitation removes the export of hardness device 2 and the access connection of electron flocculation device 3, the export of electron flocculation device 3 deposits 4 access connections with the clarification, the export and the 5 access connection of membrane processing device 4 are deposited in the clarification, the export and the 6 access connection of atomizing device of membrane processing device 5, the export and the evaporation plant 7 of atomizing device 6 are connected, the export of evaporation plant 7 and the access connection of dust remover 8.
In addition, since the sludge thickening apparatus 1, the chemical precipitation hardness removing apparatus 2, and the clarification and sedimentation apparatus 4 generate sludge when they are used, the sludge dewatering apparatus 1 is connected to the drain ports of the three apparatuses to collect the sludge. In addition, the top of the sludge concentration device 1 is also connected with an acid making system 12, so that the acid gas generated in the sludge concentration device 1 is introduced into the acid making system 12 for making sulfuric acid. In addition, when the chemical precipitation hardness removal device 2 and the clarification and precipitation device 4 are used, the waste water in the chemical precipitation hardness removal device and the clarification and precipitation device can dissipate ammonia gas in an alkaline environment, so the tops of the chemical precipitation hardness removal device and the clarification and precipitation device are also connected with an ammonia station 10 through a pipeline, and the ammonia gas in the ammonia station 10 can be introduced into an activated carbon flue gas denitration system 9 for recycling after being diluted. Further, an ammonia-containing gas is also discharged from the dust separator 8, and the ammonia-containing gas discharged from the dust separator 8 is preferably introduced into the activated carbon flue gas denitration system 9 through a pipe.
Wherein, the transmission device in the sludge concentration device 1 is preferably a mechanical low-speed scraper device with a guide cylinder. The sludge concentration device 1 is preferably in a closed square or round lower cone structure form so as to prevent acid gas escaping from the acid-making wastewater from leaking. The chemical precipitation hardness-removing device 2 is preferably a closed square structure, and the electronic flocculation device 3 is preferably a closed device, so as to prevent ammonia gas escaping from the acid-making wastewater in the two devices from leaking. The membrane treatment device 5 may be a tubular or submerged ultrafiltration membrane device. The atomizing device 6 is preferably a two-fluid nozzle atomizing device. The clarification and sedimentation device 4 can be one or a combination of a plurality of closed inclined plate clarification devices, closed inclined tube clarification devices and closed high-efficiency centrifugal sedimentation clarification devices.
The evaporation device 7 is a bypass flue, one end of the bypass flue is connected to a high-temperature flue gas pipeline in the steel sintering or pelletizing or blast furnace or coking process, and the connection point is positioned at the front end of the dust removal system, so that the high-temperature flue gas in the steel sintering or pelletizing or blast furnace or coking process is introduced into the bypass flue to be used as a heat source for evaporating the acid-making wastewater sprayed into the evaporation device 7. In order to improve the evaporation efficiency, the high-temperature flue gas in the bypass flue needs to be controlled to be above 130 ℃. The outlet of the evaporation device 7 is connected with the dust remover 8, the atomized acid-making wastewater can be gasified in the evaporation device 7, so that the salt in the acid-making wastewater is crystallized, and the crystallized salt can be filtered and retained by the dust remover 8 along with the flue gas entering the dust remover 8. In addition, ammonia gas is contained in the flue gas discharged from the evaporation device 7, so that after being filtered by the dust remover 8, the part of the gas can be introduced into the activated carbon flue gas denitration system 9.
The atomization device and the evaporation device adopted in the embodiment can realize automatic stable operation, the whole device is completely independent and separated from the main desulfurization system, online maintenance is easy, and potential safety hazards are avoided.
In addition, this embodiment utilizes atomizing device and the evaporation plant that bypass flue constitutes to evaporate the crystallization to waste water, not only deeply has utilized flue gas waste heat, still possesses performances such as desorption sulfur trioxide and heavy metal mercury simultaneously to can reduce the entry smoke temperature of desulfurization main system absorption tower, reduce the emergence that desulfurization main system absorption tower takes place unusual high temperature phenomenon, also have the flue gas and disappear white efficiency simultaneously.
In this embodiment, a method for treating wastewater from the acid production by desulfurization and denitrification with activated carbon is also provided, and the structure and function of each device in the treatment system can be further explained by using the treatment system for wastewater from the acid production by desulfurization and denitrification with activated carbon. The treatment method comprises the following specific steps:
step S1: and (3) introducing the acid-making wastewater into a sludge concentration device 1, and stirring and concentrating to obtain first sludge, acidic high-salt wastewater and acidic gas.
Preferably, the sludge thickening device is also internally provided with a transmission device, such as a mechanical slow-speed scraper device with a guide cylinder. Firstly, introducing the acid making wastewater into a closed sludge concentration device to enable suspended matters in the acid making wastewater to be gathered and concentrated to form precipitates, and then conveying the precipitates to the bottom of the sludge concentration device through the transmission device to form first sludge, wherein the middle upper part of the sludge concentration device is the acidic high-salt wastewater. The first sludge is mainly activated carbon powder with large mass and particles and metal precipitates, and the first sludge needs to be cleaned regularly.
In addition, acid gas is easily emitted from the acid-making wastewater in the stirring process of the sludge concentration device, and the acid gas is mainly SO2. The acid gas is preferably introduced into acid making system 12 for the production of sulfuric acid.
Step S2: and introducing the acidic high-salinity wastewater into a chemical precipitation hardness removal device 2, sequentially adding alkali liquor and a hardness removal agent, and stirring and reacting for precipitation to obtain second sludge, slightly alkaline high-salinity wastewater and ammonia gas.
Firstly, adding alkali liquor into the acidic high-salt wastewater through a tubular mixer to fully mix the acidic high-salt wastewater and the alkaline liquor, wherein the tubular mixer is preferably a turbine type or a folded plate type pipeline mixer. Wherein the alkali liquor can be sodium hydroxide solution, the concentration of the sodium hydroxide solution is within the range of 25-35%, the preferable concentration is 30-32%, the pH value of the wastewater is adjusted to 9.5-10.5, and the preferable pH value is adjusted to 9.8-10. Wherein the hardness-removing agent can be sodium carbonate solution, and the concentration of the solution is within the range of 10-30%, preferably 15-20%.
The hardness in the wastewater is primarily non-carbonate hardness, i.e., permanent hardness, such as calcium and magnesium ions. Hardness removal in this stepThe principle is that carbonate ions are introduced into the wastewater and then combined with calcium ions to generate calcium carbonate precipitates, and the chemical reaction formula is as follows: ca2++CO3 2-→CaCO3And ↓andcarbonate radical ions and magnesium ions are gathered to generate magnesium carbonate precipitate, and the chemical reaction formula is as follows: mg (magnesium)2++CO3 2-→MgCO3↓. The second sludge in this step is mainly calcium-magnesium sludge, and also part of activated carbon and heavy metal particles. This second sludge also requires periodic cleaning.
Considering the characteristic that ammonia nitrogen ions contained in the wastewater are volatile under alkaline conditions, the step is also carried out under closed conditions, and simultaneously, free ammonia volatilized from the step is preferably introduced into an ammonia station and can be used in an activated carbon flue gas denitration system.
And step S3, sequentially introducing the slightly alkaline high-salt wastewater into an electronic flocculation device 3 and a clarification and sedimentation device 4 to obtain third sludge, slightly alkaline high-salt clear water and ammonia gas.
Firstly, the slightly alkaline high-salt wastewater is introduced into an electronic flocculation device 3, so that fine charged particles, colloids, macromolecular proteins, virus particles and the like in the wastewater perform directional motion and collision under the action of an electric field in the electronic flocculation device, double electric layers are compressed and destabilized and flocculated, and the formed flocs can adsorb fine colloids and other substances to form large-particle matters for accelerated precipitation. Then the wastewater is led into a clarification and sedimentation device 4 for sedimentation, wherein the activated carbon powder with large mass, partial metal sediment and calcium-magnesium sediment sink to the bottom of the clarification and sedimentation device to form third sludge. This second sludge also requires periodic cleaning.
Considering the characteristic that ammonia nitrogen ions contained in the wastewater are volatile under alkaline conditions, the step is also carried out under closed conditions. Therefore, the electronic flocculation device is selected as a closed device, and the clarification and sedimentation device is preferably one or a combination of more of a closed inclined plate clarification device, a closed inclined tube clarification device and a closed high-efficiency centrifugal sedimentation clarification device. Meanwhile, the ammonia gas volatilized in the step is preferably introduced into an ammonia station and can be used for an activated carbon flue gas denitration system.
And step S4, introducing the slightly alkaline high-salt clear water into a membrane treatment device, and further removing suspended matters to obtain slightly alkaline high-salt clear water. The membrane treatment device has the characteristics of high mechanical strength, strong acid and alkali resistance and the like, the effluent quality is stable, and suspended matters in the wastewater can be effectively removed. The membrane treatment apparatus herein is preferably a tubular or submerged ultrafiltration membrane apparatus.
After the above steps, the content of suspended substances in the slightly alkaline high-salt clear water is less than 5mg/L, preferably less than 3 mg/L. The hardness content is less than 50mg/L, preferably less than 20 mg/L. The suspended matter content can be adjusted by the time of electronic flocculation and the time of clarification and precipitation, for example, the content of suspended matter is higher, so that the time of electronic flocculation and clarification and precipitation can be increased. The hardness content can be adjusted by the addition amount of the hardness-removing agent, for example, if the hardness content is higher, the addition amount of the hardness-removing agent is increased.
And step S5, adding alkali liquor into the slightly alkaline high-salt clear water, and then evaporating to obtain crystalline salt and ammonia-containing gas. The evaporation can be carried out directly by means of an evaporative crystallization device. The obtained ammonia-containing gas can be introduced into an activated carbon flue gas denitration system for recycling.
In addition, the evaporation operation in the step can also be realized by using high-temperature flue gas generated by steel sintering or pelletizing or blast furnace or coking, and the specific steps are as follows:
and S51, introducing high-temperature flue gas generated in steel sintering or pelletizing or blast furnace or coking into a bypass flue as an evaporation device, and evaporating the acid-making wastewater by using the high-temperature flue gas in the bypass flue, wherein the temperature of the flue gas in the bypass flue is preferably higher than or equal to 130 ℃.
And step S52, adding alkali liquor into the slightly alkaline high-salt clear water, atomizing, spraying into the bypass flue, and evaporating by using high-temperature flue gas in the bypass flue.
Wherein, alkali liquor is added into the alkalescent high-salt clear water through a tubular mixer to fully mix the alkalescent high-salt clear water and the alkalescent high-salt clear water, and the tubular mixer is preferably a turbine type or folded plate type pipeline mixer to prevent free ammonia from escaping, reduce energy consumption and ammonia escape and realize ammonia synthesis physical and chemical recovery. The lye here can be a sodium hydroxide solution whose concentration should be in the range from 25% to 35%, preferably from 30% to 32%. After the alkali liquor is added, the pH value of the wastewater is adjusted to 10-11, preferably to 10.5-11.
The atomizing operation can adopt a two-fluid nozzle atomizing device, the power of the two-fluid nozzle atomizing device is improved by compressed air, the pressure is generally controlled to be 0.4-0.6 MPa, the waste water and the compressed air in the nozzle body are mixed and clamped into air flow, the waste water is changed into a liquid film and is broken in the mixing process, the liquid film is broken into fine fog drops by high-speed compressed air flow, the atomization is gradually stabilized along with the improvement of the compressed air pressure and the increase of gas-liquid relative speed, and the fog drops are continuously sprayed for several meters after leaving the nozzle to form a fog shape with the height direction. After the atomized water drops are sprayed into the bypass flue, the atomized water drops and the high-temperature flue gas in the bypass flue rapidly conduct heat transfer, mass transfer and evaporation within the designed time, and very fine water drops and gas are formed to separate water, salt and other impurities.
And step S53, introducing the flue gas mixed with the crystallized salt in the bypass flue into a dust remover 8 for dust removal to obtain the crystallized salt and ammonia-containing gas.
The dust remover can be an electric dust remover or a bag-type dust remover, gas after the waste water is evaporated carries crystallized salt into the dust remover, the crystallized salt is intercepted by the dust remover, and the residual gas contains ammonia gas which is preferably introduced into an activated carbon flue gas denitration system 9 for recycling.
In addition, since the first sludge in the step S1, the second sludge in the step S2 and the third sludge in the step S3 all need to be cleaned periodically, the first sludge, the second sludge and the third sludge are preferably introduced into the sludge dewatering device 11 to be dewatered to obtain dry sludge, and the sludge can be used for an activated carbon desulfurization and denitrification process of flue gas.
The utility model discloses an active carbon SOx/NOx control system acid wastewater treatment method utilizes the high temperature flue gas among the steel smelting process to carry out the evaporative crystallization to waste water, has realized with useless to control useless, does not have newly-increased pollutant, has advantages such as economic nature and suitability.
The above treatment method is further explained by using the activated carbon desulfurization and denitrification acid making wastewater with known initial water quality.
The initial water quality of the activated carbon desulfurization and denitrification acid making wastewater is shown in table 1.
Table 1:
the specific treatment method comprises the following steps:
1) and introducing the acid-making wastewater into a sludge concentration device with a transmission device, and stirring and concentrating to obtain first sludge, acidic high-salt wastewater and acidic gas. Inputting the first sludge into a sludge dewatering device for dewatering treatment to obtain dry sludge, and using the dry sludge for a flue gas desulfurization and denitrification process by using activated carbon; the acid gas is introduced into an acid making system for making sulfuric acid.
2) And (2) introducing the acidic high-salt wastewater into a chemical precipitation hardness removal device, firstly adding a 30% sodium hydroxide solution to adjust the pH value of the wastewater to 10, then adding a 10% sodium carbonate solution and stirring to convert calcium and magnesium ions in the wastewater into calcium carbonate and magnesium carbonate precipitates, and finally obtaining second sludge, slightly alkaline high-salt wastewater and a small amount of ammonia gas. Wherein ammonia gas is introduced into the ammonia station and is used for an active carbon flue gas denitration system; and the second sludge is input into a sludge dewatering device for dewatering treatment to obtain dry sludge for the activated carbon desulfurization and denitrification process of the flue gas.
3) And (3) sequentially introducing the slightly alkaline high-salinity wastewater into an electronic flocculation device and a clarification and precipitation device for flocculation and precipitation. Finally obtaining third sludge, slightly alkaline high-salinity clear water and a small amount of ammonia gas, wherein the ammonia gas is introduced into an ammonia station and is used for an activated carbon flue gas denitration system; and the second sludge is input into a sludge dewatering device for dewatering treatment to obtain dry sludge for the activated carbon desulfurization and denitrification process of the flue gas.
4) And (4) introducing the slightly alkaline high-salt clear water obtained in the step (3) into a membrane treatment device to further remove suspended matters in the water.
5) And (3) adding 30% sodium hydroxide solution into the slightly alkaline high-salt clear water obtained in the step (4) through a pipeline mixer to adjust the pH value to 10, atomizing and spraying the slightly alkaline high-salt clear water into a bypass flue through an atomizing device, evaporating the slightly alkaline high-salt clear water by using the high-temperature flue gas in the bypass flue, performing dust removal treatment through a dust remover to obtain crystal salt and ammonia-containing gas, and finally introducing the ammonia-containing gas into an activated carbon flue gas denitration system.
The embodiments of the present invention have been described in detail, and the principles and embodiments of the present invention have been explained herein using specific embodiments, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, and in summary, the content of the present specification should not be understood as the limitation of the present invention.
Claims (6)
1. The utility model provides a processing system of active carbon SOx/NOx control system acid waste water which characterized in that, processing system includes:
the sludge concentration device is used for carrying out concentration and precipitation on the acid-making wastewater;
the chemical precipitation hardness removal device is communicated with the sludge concentration device and is used for reducing the hardness of the acid making wastewater;
the electronic flocculation device is communicated with the chemical precipitation hardness removal device and is used for accelerating the precipitation of suspended matters in the acid-making wastewater;
the clarification and sedimentation device is communicated with the electronic flocculation device and is used for settling suspended matters in the acid-making wastewater;
the membrane treatment device is communicated with the clarification and precipitation device and is used for removing suspended matters in the acid-making wastewater;
and the evaporation device is communicated with the membrane treatment device and is used for carrying out evaporation crystallization on the acid making wastewater.
2. The system for treating wastewater from the desulfurization and denitrification of activated carbon as claimed in claim 1, further comprising an atomization device disposed between the membrane treatment device and the evaporation device, for atomizing and spraying the wastewater from the acid production into the evaporation device;
the evaporation device is a bypass flue, high-temperature flue gas generated in steel sintering or pelletizing or blast furnace or coking is introduced into one end of the bypass flue and used as a heat source to evaporate the acid making wastewater sprayed into the evaporation device, and a dust remover is connected to the other end of the bypass flue to obtain crystal salt generated by crystallization of the acid making wastewater.
3. The system for treating wastewater from the desulfurization and denitrification of acid production by activated carbon according to claim 2, wherein the exhaust end of the dust separator is connected to an activated carbon flue gas denitration system for introducing the ammonia-containing gas in the dust separator into the activated carbon flue gas denitration system.
4. The system for treating wastewater from the desulfurization and denitrification of activated carbon as claimed in any one of claims 1 to 3, wherein a sludge dewatering device is connected to a sewage outlet of the sludge concentration device and/or a sewage outlet of the chemical precipitation hardness removal device and/or a sewage outlet of the clarification and precipitation device.
5. The system for treating wastewater from the desulfurization and denitrification of active carbon according to any one of claims 1 to 3, wherein the sludge concentration device, the chemical precipitation hardness removal device, the electronic flocculation device and the clarification and sedimentation device are all closed devices.
6. The system for treating wastewater generated in the desulfurization and denitrification of activated carbon as claimed in any one of claims 1 to 3, wherein a transmission device is further arranged in the sludge concentration device, and is used for conveying the precipitate formed by the wastewater generated in the acid production to the bottom of the sludge concentration device.
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