CN118545805A - Process and system for treating ammonia-containing wastewater of power plant condensate polishing system - Google Patents
Process and system for treating ammonia-containing wastewater of power plant condensate polishing system Download PDFInfo
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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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
- C02F1/4674—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation with halogen or compound of halogens, e.g. chlorine, bromine
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/003—Downstream control, i.e. outlet monitoring, e.g. to check the treating agents, such as halogens or ozone, leaving the process
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/14—NH3-N
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Abstract
The invention provides an ammonia-containing wastewater treatment process and an ammonia-containing wastewater treatment system for a condensate polishing system of a power plant, which are characterized in that high-concentration NaCl and NH 4 Cl wastewater in an acid-base liquid inlet period and a replacement period during resin regeneration of the condensate polishing system are independently collected by automatic control and are collected in an ammonia-containing wastewater collection tank; a large amount of flushing wastewater in other regeneration stages is directly recycled in a factory; the wastewater containing the ammonia wastewater collection tank is filtered and then is conveyed to a wastewater electrolysis tank, effective chlorine is generated through electrochemical reaction, and the wastewater containing the effective chlorine is conveyed to a reaction tank and reacts with ammonia nitrogen to generate N 2, so that the ammonia nitrogen concentration is reduced; and (3) delivering the wastewater from the reaction tank to an ammonia-containing wastewater collection tank again, repeating internal circulation and reaction, continuously reducing ammonia nitrogen concentration until the wastewater meets a set value of emission requirements, and discharging the wastewater to the outside. Sodium hypochlorite is not added in the treatment process, byproducts such as sludge, ammonium salt and the like are not generated, the treatment water quantity is small, and the method has good economical efficiency and environmental friendliness and is suitable for nuclear power plants and conventional thermal power plants.
Description
Technical Field
The invention relates to the technical field of power plant wastewater treatment, in particular to an ammonia-containing wastewater treatment process and an ammonia-containing wastewater treatment system for a power plant condensate polishing system, which are applicable to nuclear power plants and conventional thermal power plants.
Background
The wastewater regenerated by the resin of the condensate polishing system of the power plant contains a large amount of ammonia nitrogen, including nitrogen in the form of free ammonia (NH 3) and ammonium ions (NH 4 +), which does not meet the environmental emission standard. At present, ammonia nitrogen treatment processes such as a biological method, a gaseous membrane method and sodium hypochlorite addition are mostly adopted, and although ammonia nitrogen in wastewater can be removed, the processes have some defects.
For example, biological ammonia removal processes are of a large variety, wherein the "anaerobic ammonia oxidation+a/O" process is most effective, but the process is more complex, the operation control difficulty is greater, sludge is generated, and particularly in a nuclear power plant, the wastewater regenerated by condensate polishing is likely to be polluted by radioactivity, and the final disposal of the sludge is difficult. For example, in the process of removing ammonia by a gaseous membrane method, an ammonia-containing wastewater and an absorption liquid are separated by a microporous hydrophobic membrane, and a vapor pressure difference of a volatile component (ammonia) on two sides of the membrane is used as a driving force to remove, recover and enrich ammonia in feed liquid or wastewater, a large amount of ammonium salt solution is generated in the process, and the problem of difficult treatment of a nuclear power plant also exists. For example, when outsourcing sodium hypochlorite is used for removing ammonia nitrogen, NH 3 -N is oxidized into N 2 by adopting a break point chlorination principle, and when outsourcing sodium hypochlorite (10% of available chlorine) is added for removing ammonia nitrogen, the dosing cost of ton water is more than 50 yuan when the ammonia content is high, the dosing cost is higher, and the economical efficiency is poor.
In summary, the existing biological method, gaseous membrane method, sodium hypochlorite adding and other ammonia nitrogen treatment processes do not carry out quality recovery on the condensate fine treatment regeneration wastewater, the amount of wastewater to be treated is large, the operation cost is high, the process is complex, a large amount of sludge and byproducts are generated to be treated, and particularly in a nuclear power plant, the sludge and byproducts are difficult to treat because the fine treatment regeneration wastewater is possibly polluted by radioactivity.
Disclosure of Invention
Based on the method, the invention provides an ammonia-containing wastewater treatment process and an ammonia-containing wastewater treatment system for a power plant condensate water fine treatment system, so that ammonia nitrogen in wastewater is effectively removed in the treatment process, sodium hypochlorite is not added, byproducts such as sludge and ammonium salt are not generated, and the economical efficiency and the environmental friendliness of wastewater treatment are improved.
In order to achieve the above purpose, in a first aspect, the invention provides an ammonia-containing wastewater treatment process of a condensate polishing system of a power plant, wherein acid-base liquid inlet period and displacement period drainage during resin regeneration of the condensate polishing system are collected independently through on-line instrument monitoring and automatic valve switching, the two period drainage contains high-concentration NaCl and NH 4 Cl, the high-concentration NaCl and NH 4 Cl are collected in an ammonia-containing wastewater collection tank, and a large amount of wastewater in the regeneration backwashing and flushing stages of other resins has very low NaCl and NH 4 Cl content, so that the wastewater can be directly recycled in the plant; the collected wastewater is conveyed to a filter, and the large-particle suspended matters are removed by filtration; delivering the filtered wastewater to a wastewater electrolysis tank, and generating effective chlorine dissolved in the wastewater through electrochemical reaction; the wastewater containing available chlorine is conveyed to a reaction tank and reacts with ammonia nitrogen, so that the ammonia nitrogen concentration is gradually reduced; and discharging the wastewater after the ammonia nitrogen concentration is reduced to a set value to the outside.
Further, an internal circulation flow and reaction are established between the reaction tank and an ammonia-containing wastewater collection tank: delivering the wastewater in the ammonia-containing wastewater collection tank to a wastewater electrolytic tank, generating available chlorine through electrochemical reaction, and delivering the available chlorine into the ammonia-containing wastewater collection tank to react with ammonia nitrogen; delivering the wastewater with the reduced effective chlorine concentration to an ammonia-containing wastewater collection tank again, performing electrochemical reaction through a wastewater water electrolysis tank to generate effective chlorine, and delivering the effective chlorine into a reaction tank again to react with ammonia nitrogen; repeating the internal circulation and the reaction, gradually reducing the ammonia nitrogen concentration until the ammonia nitrogen concentration of the wastewater is reduced to a set value, and discharging the wastewater to the outside. Based on the technical scheme, through establishing internal circulation and reaction, the wastewater is conveyed to a wastewater electrolysis tank for electrochemical reaction for a plurality of times to generate effective chlorine, and is conveyed to a reaction tank for reaction with ammonia nitrogen, so that the concentration of the ammonia nitrogen is effectively reduced.
Further, naCl in the wastewater is subjected to electrochemical reaction in an electrolytic tank to generate Cl 2 and NaClO which are used as available chlorine to react with ammonia nitrogen in the wastewater to generate N 2. The available chlorine is a chlorine-containing substance with oxidation performance and capable of participating in oxidation reaction, and is generated by NaCl in wastewater through electrochemical reaction, and comprises Cl 2 and NaClO.
Furthermore, the wastewater is aerated in the reaction tank, so that the mixing uniformity of the effective chlorine and the wastewater in the reaction tank is improved, and the gas overflow generated by the reaction can be accelerated.
In order to achieve the above object, in a second aspect, the present invention provides an ammonia-containing wastewater treatment system of a condensate polishing system of a power plant, comprising an ammonia-containing wastewater collection tank, a filter, a wastewater treatment tank, a reaction tank, a wastewater circulation pump and a wastewater treatment controller; the ammonia-containing wastewater collection tank is connected with a power plant condensate polishing system through an input valve; the inlet of the filter is connected with an ammonia-containing wastewater collecting tank through a booster pump, and the outlet of the filter is connected with one end of a wastewater treatment tank; an inlet of the reaction tank is connected with the other end of the waste water electrolytic bath, an outlet of the reaction tank is connected with the outside through a discharge valve, and an aeration device connected with an aeration fan is arranged in the reaction tank; the wastewater circulating pump is connected between the ammonia-containing wastewater collecting tank and the reaction tank.
Further, the filter is an automatic flushing filter, the suction end of the booster pump is connected with the ammonia-containing wastewater collecting tank, the discharge end of the booster pump is connected with the inlet of the automatic flushing filter, and in the internal circulation process, the automatic flushing filter has multiple filtering actions on the circulating wastewater and keeps circulation through automatic flushing.
Further, the reaction tank is provided with an online ammonia nitrogen monitor, the wastewater treatment controller is connected with the online ammonia nitrogen monitor and the wastewater circulating pump, and is configured to control the circulating pump to be opened for internal circulation treatment of wastewater when the ammonia nitrogen concentration is detected to be higher than a set range, and to generate available chlorine through electrochemical reaction of the electrolytic tank in a circulation process, so that the internal circulation is automatically performed according to the ammonia nitrogen concentration condition.
Further, the reaction tank is provided with an online ammonia nitrogen monitor, and the wastewater treatment controller is connected with the online ammonia nitrogen monitor and the discharge valve and is configured to control the discharge valve to be opened to discharge the treated wastewater to the outside when detecting that the ammonia nitrogen concentration is lower than a set value so as to realize automatic discharge to the outside according to the ammonia nitrogen concentration condition.
Further, the ammonia-containing wastewater collection tanks comprise two ammonia-containing wastewater collection tanks, each ammonia-containing wastewater collection tank is connected with a power plant condensate polishing system through an independent input valve, the wastewater treatment tank and each ammonia-containing wastewater collection tank are selectively connected, one ammonia-containing wastewater collection tank and the reaction tank are closed and internally circulated to treat ammonia-containing wastewater in the same period, and the other ammonia-containing wastewater collection tank receives the condensate polishing system ammonia-containing wastewater to meet the requirements of continuous collection of the ammonia-containing wastewater and continuous treatment of the ammonia-containing wastewater.
The ammonia-containing wastewater treatment process and the ammonia-containing wastewater treatment system for the power plant condensate polishing system provided by the invention have the technical advantages that:
According to the first aspect, the quality recovery of the wastewater from the resin regeneration is innovatively carried out, and the high-concentration NaCl and NH 4 Cl wastewater in the acid-base liquid inlet period and the replacement period during the resin regeneration are independently collected, so that the Cl - concentration is effectively kept, the wastewater has the condition of generating effective chlorine by electrolysis, the ammonia nitrogen removal of the electrolysis wastewater is realized, the addition of sodium hypochlorite is not needed, and the drug addition cost is saved;
In the second aspect, the volume of wastewater to be treated by removing ammonia nitrogen is greatly reduced, and the wastewater in other periods is singly collected and recycled in a factory;
In the third aspect, byproducts such as sludge, ammonium salt and the like are not generated in the treatment process, so that the treatment difficulty of the sludge and the byproducts is solved, and the method is particularly suitable for the treatment of removing ammonia nitrogen from the condensate water regeneration wastewater of the nuclear power plant and is also suitable for conventional thermal power plants.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention. The invention may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
FIG. 1 is a schematic diagram of an ammonia-containing wastewater treatment system for a condensate polishing system of a power plant according to one embodiment of the present invention.
Fig. 2 is a flow chart of an ammonia-containing wastewater treatment process of the condensate polishing system of a power plant according to an embodiment of the invention.
FIG. 3 is a block flow diagram of an ammonia-containing wastewater treatment process for a condensate polishing system of a power plant according to an embodiment of the present invention.
The attached drawings are used for identifying and describing:
1-an ammonia-containing wastewater collection tank, 2-a booster pump, 3-a filter, 4-a wastewater water electrolysis tank, 5-a reaction tank, 6-an aeration fan, 7-an aeration device, 8-a wastewater circulating pump and 9-an online ammonia nitrogen monitor.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative, and is in no way intended to limit the invention, its application, or uses. The present invention may be embodied in many different forms and is not limited to the embodiments herein. In the present invention, when it is described that a specific device is located between a first device and a second device, an intervening device may or may not be present between the specific device and the first device or the second device.
As shown in fig. 1 and fig. 2, the process for treating the wastewater containing ammonia in the condensate polishing system of the power plant provided by the invention comprises the following steps:
S100, through on-line instrument monitoring and automatic valve switching, separately collecting acid-base liquid inlet period and displacement period drainage when the condensate polishing system is used for resin regeneration, and collecting high-concentration NaCl and NH 4 Cl wastewater discharged in the two periods in an ammonia-containing wastewater collecting tank 1; the rest backwashing period and a large amount of low-concentration NaCl and NH 4 Cl wastewater discharged in the flushing period are directly recycled in the factory;
S200, conveying the collected wastewater to a filter 3, and filtering to remove large-particle suspended matters;
s300, delivering the filtered wastewater to a wastewater electrolysis tank 4, and generating available chlorine dissolved in the wastewater through electrochemical reaction; wherein, in the waste water electrolysis tank 4, naCl in the waste water is subjected to electrochemical reaction to generate Cl 2 and NaClO as effective chlorine. The electrochemical reaction includes:
Ionization reaction: naCl-Na ++Cl-
Electrochemical reaction: anode 2Cl- & gtCl 2+2e-
Cathode 2H ++2e-→H2
Chemical reaction in solution: na + +OH- & gtNaOH
2NaOH+Cl2→NaClO+NaCl+H2O
Wherein Cl 2 exists in the wastewater in an unstable form and is easily converted into NaClO through chemical reaction.
S400, conveying the wastewater containing available chlorine to a reaction tank 5 and reacting with ammonia nitrogen, so that the ammonia nitrogen concentration is gradually reduced; in the reaction tank 5, the generated Cl 2 and NaClO react with ammonia nitrogen in the wastewater to generate N 2, and the ammonia nitrogen concentration is reduced.
Preferably, in the reaction process, the wastewater is aerated in the reaction tank 5, so that the mixing uniformity of the effective chlorine in the reaction tank 5 and the wastewater is improved, and the reaction removal of ammonia nitrogen in the reaction tank 5 is accelerated;
S500, discharging the wastewater after the ammonia nitrogen concentration is reduced to a set value to the outside, reaching the emission standard specified by the industry, and realizing environmental protection.
Compared with all the existing technologies, the ammonia-containing wastewater treatment technology of the power plant condensate polishing system provided by the embodiment is characterized in that the high-concentration NaCl and NH 4 Cl wastewater in the acid-base liquid inlet period and the replacement period during resin regeneration is collected independently, the Cl - concentration is effectively kept, the wastewater itself has the condition of generating effective chlorine through electrolysis, the wastewater in the rest period is recycled, the wastewater volume for ammonia nitrogen removal treatment is reduced, ammonia nitrogen removal is realized by the electrolysis wastewater itself, sodium hypochlorite is not needed, the drug addition cost is saved, byproducts such as sludge and ammonium salt are not generated in the treatment process, the technology is suitable for ammonia nitrogen removal treatment of condensate regeneration wastewater of a nuclear power plant, and the technology is also suitable for conventional thermal power plants, and has better economical efficiency and environmental friendliness.
As shown in fig. 1 and 3, in a preferred embodiment, an internal circulation flow and reaction is established between the reaction tank 5 and the ammonia-containing wastewater collection tank 1:
S410, delivering the wastewater in the ammonia-containing wastewater collection tank 1 to a wastewater treatment tank 4, generating available chlorine through electrochemical reaction, and delivering the available chlorine to a reaction tank 5 to react with ammonia nitrogen;
S420, delivering the wastewater with the reduced effective chlorine concentration to an ammonia-containing wastewater collection tank 1 again, performing electrochemical reaction through a wastewater electrolysis tank 4 to generate effective chlorine, and delivering the effective chlorine into a reaction tank 5 again to react with ammonia nitrogen;
S430, repeating the internal circulation and the reaction, gradually reducing the ammonia nitrogen concentration until the ammonia nitrogen concentration of the wastewater is reduced to a set value, and discharging the wastewater to the outside.
As shown in fig. 1, in order to implement the above process, an embodiment of an ammonia-containing wastewater treatment system of a condensate polishing system of a power plant provided by the present invention includes an ammonia-containing wastewater collection tank 1, a filter 3, a wastewater treatment tank 4, a reaction tank 5, a wastewater circulation pump 8, and a wastewater treatment controller. The ammonia-containing wastewater collection tank 1 is connected with a power plant condensate polishing system through an input valve; the inlet of the filter 3 is connected with the ammonia-containing wastewater collection tank 1 through the booster pump 2, and the outlet is connected with one end of the wastewater treatment tank 4; an inlet of the reaction tank 5 is connected with the other end of the waste water electrolytic bath 4, an outlet of the reaction tank is connected with the outside through a discharge valve, and an aeration device 7 connected with an aeration fan 6 is arranged in the reaction tank 5; the wastewater circulating pump 8 is connected between the ammonia-containing wastewater collecting tank 1 and the reaction tank 5.
In the specific implementation process, the wastewater treatment controller can be an industrial personal computer, a PLC (programmable logic controller) or a DCS (distributed control system) controller, and is in control connection with the booster pump 2, the wastewater circulating pump 8, the input valve, the discharge valve, the filter 3, the wastewater water tank 4, the aeration fan 6 and the like to control the automatic operation of the whole wastewater ammonia nitrogen removal process.
The flow direction of the discharged wastewater of the condensate polishing system in different periods is controlled through on-line instrument monitoring and automatic valve switching. The method comprises the following steps: an automatic valve is arranged between the condensate polishing system and the wastewater collection tank 1, the output end of the condensate polishing system is provided with an on-line instrument, the on-line instrument is in signal connection with the automatic valve, the concentration of NaCl and NH 4 Cl of wastewater discharged by the condensate polishing system is monitored through the on-line instrument, and when the concentration of NaCl and NH 4 Cl is monitored to be higher than a set value, the automatic valve controls the wastewater to be discharged to the ammonia-containing wastewater collection tank 1; when the concentration of NaCl and NH 4 Cl is monitored to be lower than the set value, the automatic valve controls the wastewater to be discharged into the factory for recycling.
Wherein, the waste water electrolyzer 4 is connected between the ammonia-containing waste water collecting tank 1 and the reaction tank 5 and is used for the electrochemical reaction of the waste water after impurity filtering, and NaCl generates Cl 2 and NaClO as effective chlorine through the electrochemical reaction. In the specific implementation process, the time control of the electrochemical reaction in the waste water electrolysis tank 4 can be performed according to the process requirement by arranging switch valves at the two ends of the waste water electrolysis tank 4, so as to realize economic operation.
Compared with the existing biological method, gaseous membrane method, sodium hypochlorite and other ammonia nitrogen treatment processes, the ammonia-containing wastewater treatment system of the power plant condensate polishing system provided by the embodiment realizes independent collection, filtration, electrochemical reaction and ammonia nitrogen removal of the wastewater with high ammonia nitrogen concentration, the whole process is automatically completed, sodium hypochlorite is not added, byproducts such as sludge and ammonium salt are not produced, better environmental protection and economy are achieved, and the ammonia-containing wastewater treatment system is particularly suitable for the treatment of ammonia nitrogen removal of condensate polishing system regenerated wastewater of a nuclear power plant and is also suitable for a conventional thermal power plant.
In a specific implementation, preferably, the filter 3 is an automatic flushing filter, the suction end of the wastewater circulating pump 8 is connected with the reaction tank 5, the discharge end of the wastewater circulating pump is connected with the ammonia-containing wastewater collecting tank 1, and the filter is prevented from being blocked by large-particle suspended matters contained in the wastewater through automatic flushing operation of the automatic flushing filter, so that the filtering fluxion is maintained.
As shown in fig. 1, in a preferred embodiment, the reaction tank 5 is provided with an online ammonia nitrogen monitor 9, and the wastewater treatment controller is connected with the online ammonia nitrogen monitor 9 and a wastewater circulation pump 8, and is configured to control the circulation pump to be turned on to perform internal circulation treatment of wastewater when detecting that the ammonia nitrogen concentration is higher than a set range, and to generate available chlorine through electrochemical reaction of the electrolytic cell during circulation. The online ammonia nitrogen monitor 9 is connected with a wastewater treatment controller in a signal manner, so that the ammonia nitrogen concentration of the wastewater is monitored in real time, the operation of the wastewater circulating pump 8 is controlled, the multiple circulation of the wastewater with the ammonia nitrogen concentration which does not meet the discharge standard is realized, the effective chlorine is generated in the electrolytic tank, the wastewater is put into the electrolytic tank to remove the ammonia nitrogen, the ammonia nitrogen concentration is gradually reduced, and the automatic ammonia nitrogen treatment operation is realized.
Meanwhile, based on the ammonia nitrogen removal process in the reaction tank, the ammonia nitrogen concentration in the reaction tank is inspected on line until the ammonia nitrogen concentration in the reaction tank reaches the standard, the characteristic of high concentration of Cl - in the reaction tank can be effectively utilized, continuous reaction is realized, the whole process is realized without adding NaClO, and the ammonia nitrogen removal cost is reduced.
In a preferred embodiment, as shown in fig. 1, the reaction tank 5 is provided with an online ammonia nitrogen monitor 9, and the wastewater treatment controller is connected to the online ammonia nitrogen monitor 9 and the discharge valve and configured to control the discharge valve to be opened to discharge the treated wastewater to the outside when detecting that the ammonia nitrogen concentration is lower than a set value. Through the embodiment, when the concentration of ammonia nitrogen is reduced to meet the ammonia nitrogen concentration requirement after the ammonia nitrogen is subjected to the effective chlorine reaction generated by the electrolysis reaction, the discharge valve is controlled to discharge the wastewater, so that the discharge safety is realized.
Considering the continuous discharge of high concentration NaCl and NH 4 Cl wastewater from the power plant condensate polishing system during the acid-base liquid inlet period and the displacement period during the resin regeneration, in a preferred embodiment, the ammonia-containing wastewater collection tanks 1 comprise two, each of the ammonia-containing wastewater collection tanks 1 is connected with the power plant condensate polishing system through a separate input valve, and during the same period, one of the ammonia-containing wastewater collection tanks 1 and the reaction tank 5 are closed and circulated internally to treat the ammonia-containing wastewater, and the other ammonia-containing wastewater collection tank 1 receives the ammonia-containing wastewater from the condensate polishing system. Based on the above structure, the wastewater discharge process requirement during the resin regeneration of the condensate polishing system of the power plant can be met, and simultaneously the continuous process of the ammonia-containing wastewater treatment is met, so that the treatment efficiency is improved.
The waste water and water electrolytic tank 4 is selectively connected with each ammonia-containing wastewater collecting tank 1, and specifically, a plurality of parallel pipelines are arranged between the waste water electrolytic tank and each ammonia-containing wastewater collecting tank 1, each pipeline is provided with a separate switch valve, and the communication switching between each ammonia-containing wastewater collecting tank and the waste water electrolytic tank is controlled through the switch valve.
In other embodiments, a waste water electrolysis tank 4 can be arranged between each waste water collecting tank 1 and each reaction tank 5, so that independent work of each electrolysis tank 4 can be realized, and a plurality of reaction tanks 5 which are independently controlled can also be arranged, so that the treatment capacity of the large-discharge ammonia nitrogen-containing waste water is improved.
While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be understood by those skilled in the art that the foregoing embodiments may be modified and equivalents substituted for elements thereof without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (9)
1. An ammonia-containing wastewater treatment process of a condensate polishing system of a power plant is characterized by comprising the following steps of:
Through on-line instrument monitoring and automatic valve switching, the acid-base liquid inlet period and the displacement period are independently collected for drainage during resin regeneration of a condensate polishing system, and the high-concentration NaCl and NH 4 Cl wastewater discharged during the two periods is collected in an ammonia-containing wastewater collection tank (1); the rest backwashing period and a large amount of low-concentration NaCl and NH 4 Cl wastewater discharged in the flushing period are directly recycled in the factory;
the wastewater in the ammonia-containing wastewater collection tank (1) is conveyed to a filter (3) for filtering and removing large-particle suspended matters;
Delivering the filtered wastewater to a wastewater electrolysis tank (4) to generate effective chlorine dissolved in the wastewater through electrochemical reaction;
the wastewater containing available chlorine is conveyed to a reaction tank (5) and reacts with ammonia nitrogen, so that the ammonia nitrogen concentration is gradually reduced;
And discharging the wastewater after the ammonia nitrogen concentration is reduced to a set value to the outside.
2. The process for treating ammonia-containing wastewater of a condensate polishing system of a power plant according to claim 1, wherein: an internal circulation flow and a reaction are established between the reaction tank (5) and the ammonia-containing wastewater collection tank (1):
The wastewater in the ammonia-containing wastewater collection tank (1) is conveyed to a wastewater electrolysis tank (4), and effective chlorine is generated through electrochemical reaction and conveyed to a reaction tank (5) to react with ammonia nitrogen;
The wastewater with the reduced effective chlorine concentration is conveyed to an ammonia-containing wastewater collection tank (1) again, the wastewater undergoes electrochemical reaction through a wastewater electrolysis tank (4) to generate effective chlorine, and the effective chlorine is conveyed to a reaction tank (5) again to react with ammonia nitrogen;
repeating the internal circulation and the reaction, gradually reducing the ammonia nitrogen concentration until the ammonia nitrogen concentration of the wastewater is reduced to a set value, and discharging the wastewater to the outside.
3. The process for treating wastewater containing ammonia by a condensate polishing system of a power plant according to claim 1 or 2, wherein: naCl in the wastewater is subjected to electrochemical reaction in a wastewater water electrolysis tank (4) to generate Cl 2 and NaClO as effective chlorine, and the effective chlorine reacts with ammonia nitrogen in the wastewater to generate N 2.
4. The process for treating ammonia-containing wastewater of a condensate polishing system of a power plant according to claim 1, wherein: and (3) aerating the wastewater in the reaction tank (5) to improve the mixing uniformity of the effective chlorine and the wastewater in the reaction tank (5).
5. An ammonia-containing wastewater treatment system of a condensate polishing system of a power plant, for an ammonia-containing wastewater treatment process of a condensate polishing system of a power plant according to any one of claims 1 to 4, characterized in that:
Comprises an ammonia-containing wastewater collection tank (1), a filter (3), a wastewater treatment tank (4), a reaction tank (5), a wastewater circulating pump (8) and a wastewater treatment controller;
The ammonia-containing wastewater collection tank (1) is connected with a power plant condensate polishing system through an input valve;
An inlet of the filter (3) is connected with the ammonia-containing wastewater collection tank (1) through the booster pump (2), and an outlet of the filter is connected with one end of the wastewater treatment tank (4);
An inlet of the reaction tank (5) is connected with the other end of the waste water electrolysis bath (4), an outlet of the reaction tank is connected with the outside through a discharge valve, and an aeration device (7) connected with an aeration fan (6) is arranged in the reaction tank (5);
The wastewater circulating pump (8) is connected between the ammonia-containing wastewater collecting tank (1) and the reaction tank (5).
6. The system for treating wastewater containing ammonia in a fine treatment system for condensate in a power plant according to claim 5, wherein: the filter (3) is an automatic flushing filter (3), the suction end of the wastewater circulating pump (8) is connected with the reaction tank (5), and the discharge end is connected with the ammonia-containing wastewater collecting tank (1).
7. The plant condensate polishing system ammonia-containing wastewater treatment system of claim 5 or 6, wherein: the reaction tank (5) is provided with an online ammonia nitrogen monitor (9), and the wastewater treatment controller is connected with the online ammonia nitrogen monitor (9) and a wastewater circulating pump (8) and is configured to control the circulating pump to be opened for internal circulation treatment of wastewater when detecting that the ammonia nitrogen concentration is higher than a set range, and to generate available chlorine through electrochemical reaction of the electrolytic tank in a circulation process.
8. The plant condensate polishing system ammonia-containing wastewater treatment system of claim 5 or 6, wherein: the reaction tank (5) is provided with an online ammonia nitrogen monitor (9), and the wastewater treatment controller is connected with the online ammonia nitrogen monitor (9) and the discharge valve and is configured to control the discharge valve to be opened to discharge the treated wastewater to the outside when detecting that the ammonia nitrogen concentration is lower than a set value.
9. The system for treating wastewater containing ammonia in a fine treatment system for condensate in a power plant according to claim 5, wherein: the ammonia-containing wastewater collection tanks (1) comprise two ammonia-containing wastewater collection tanks (1) which are respectively connected with a power plant condensate fine treatment system through independent input valves, the wastewater treatment tanks (4) are selectively connected with the ammonia-containing wastewater collection tanks (1), one ammonia-containing wastewater collection tank (1) and the reaction tank (5) are closed and internally circulated to treat ammonia-containing wastewater in the same period, and the other ammonia-containing wastewater collection tank (1) receives the condensate fine treatment system ammonia-containing wastewater.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN205662392U (en) * | 2016-05-30 | 2016-10-26 | 中国电力工程顾问集团华北电力设计院有限公司 | Recycling system is handled to meticulous matter of dividing of thermal power plant's waste water |
| CN211664878U (en) * | 2018-12-18 | 2020-10-13 | 罗钦钟 | Ammonia nitrogen wastewater treatment device |
| CN214990851U (en) * | 2021-01-12 | 2021-12-03 | 山东中侨启迪环保装备有限公司 | Treatment device for removing ammonia nitrogen in wastewater through electrolysis |
| CN112939294A (en) * | 2021-02-04 | 2021-06-11 | 成都硕特环保科技有限公司 | Electrolytic oxidation method and system for synchronous denitrification and decarbonization |
| CN220056588U (en) * | 2023-06-09 | 2023-11-21 | 皓禹(厦门)环保有限公司 | Purification cyclic utilization system of eel breeding wastewater |
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