Wastewater treatment system

Abstract

The embodiment of the invention provides a wastewater treatment system. The wastewater treatment system comprises an ammonia nitrogen treatment box, first dosing equipment, a first pipeline, a radiation monitoring box, a second pipeline, second dosing equipment, a discharge pipeline and a third pipeline. The two ends of the first pipeline can communicate with the ammonia nitrogen treatment box, and when the two ends of the first pipeline communicate with the ammonia nitrogen treatment box, the first pipeline is formed by the first pipeline and the ammonia nitrogen treatment box. The two ends of the second pipeline can communicate with the radiation monitoring box, and when the two ends of the second pipeline communicate with the radiation monitoring box, the second pipeline and the radiation monitoring box form the second pipeline. The second conduit may be in communication with the first conduit. And the discharge pipeline is an output channel of the finally up-to-standard wastewater. One end of the third pipeline is connected with a middle monitoring point of the discharge pipeline, and the other end of the third pipeline is connected with a reflux inlet or a water inlet of the radiation monitoring box. According to the wastewater treatment system disclosed by the embodiment of the invention, the efficiency of treating potential radioactive wastewater with high ammonia nitrogen content is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear power plant wastewater treatment, and in particular to a wastewater treatment system. BACKGROUND

[0002] In the operation process of a nuclear power plant, the wastewater discharged by a secondary loop system is potential radioactive wastewater. According to relevant regulations and specifications, this part of wastewater needs to be collected first, and then discharged into a non-radioactive production wastewater system (WWS) for monitoring of radioactivity. Only when the radioactivity meets the requirements can it be discharged.

[0003] With the continuous improvement of environmental protection requirements, clear discharge requirements are also proposed for the ammonia nitrogen content of the above-mentioned potential radioactive wastewater. In the related art, high ammonia nitrogen wastewater is collected and treated first, and after the wastewater is treated in the system and qualified, it is then transported to the WWS for radioactivity monitoring and discharged. However, the above-mentioned potential radioactive wastewater with high ammonia nitrogen content has a low treatment efficiency. SUMMARY

[0004] The embodiments of the present application provide a wastewater treatment system which can not only realize the radioactivity monitoring and discharge function of the original WWS system, but also has ammonia nitrogen treatment and wastewater neutralization treatment functions, so that it can treat high ammonia nitrogen wastewater and wastewater with pH exceeding the standard discharged by the secondary loop system, and the ammonia nitrogen content and pH of the wastewater can meet the wastewater discharge requirements, thereby improving the treatment efficiency of potential radioactive wastewater.

[0005] The embodiments of the present application provide a wastewater treatment system, which comprises:

[0006] An ammonia nitrogen treatment tank configured to store to-be-discharged wastewater with ammonia nitrogen content exceeding a first discharge value;

[0007] A first dosing device in communication with the ammonia nitrogen treatment tank, and the first dosing device is configured to add a drug into the ammonia nitrogen treatment tank to reduce the ammonia nitrogen content in the to-be-discharged wastewater and adjust the acid-base value of the to-be-discharged wastewater;

[0008] A first pipeline, both ends of the first pipeline being in communication with the ammonia nitrogen treatment tank, and when both ends of the first pipeline are in communication with the ammonia nitrogen treatment tank, a first loop is formed between the first pipeline and the ammonia nitrogen treatment tank;

[0009] A radioactivity monitoring tank configured to store to-be-discharged wastewater with ammonia nitrogen content not exceeding the first discharge value;

[0010] A second pipeline, both ends of the second pipeline being configured to be in communication with the radiation monitoring tank, and when both ends of the second pipeline are in communication with the radiation monitoring tank, a second loop is formed with the radiation monitoring tank; the second pipeline is configured to be in communication with the first pipeline when the ammonia nitrogen content in the wastewater to be discharged in the radiation monitoring tank exceeds the first discharge value, or when the ammonia nitrogen content in the wastewater to be discharged in the ammonia nitrogen treatment tank is lower than the first discharge value;

[0011] A second dosing device, in communication with the second pipeline, and the second dosing device is configured to add a drug into the radiation monitoring tank to adjust the pH value of the wastewater to be discharged;

[0012] A discharge pipeline, configured to be in communication with the first pipeline and / or the second pipeline when the ammonia nitrogen content in the wastewater to be discharged does not exceed the first discharge value, and the content of radioactive elements does not exceed a second discharge value;

[0013] A third pipeline, both ends of the third pipeline being configured to be in communication with the discharge pipeline and the radiation monitoring tank respectively when the content of radioactive elements in the wastewater to be discharged in the discharge pipeline exceeds the second discharge value.

[0014] In a possible implementation, the discharge pipeline includes a first pipe section and a second pipe section, an inlet end of the first pipe section being configured to be in communication with the first pipeline, and an outlet end of the first pipe section being in communication with the second pipe section; an inlet end of the second pipe section being configured to be in communication with the second pipeline.

[0015] In a possible implementation, the wastewater treatment system further includes a first driving device, the first driving device being in communication with the first pipeline, and the first driving device being configured to drive the wastewater to be discharged to flow to the ammonia nitrogen treatment tank or the first pipe section.

[0016] In a possible implementation, the wastewater treatment system further includes a second driving device, the second driving device being in communication with the second pipeline, and the second driving device being configured to drive the wastewater to be discharged flowing through the second pipeline to flow to the radiation monitoring tank or the second pipe section.

[0017] In a possible implementation, the wastewater treatment system is in the second pipeline, and the second dosing device is located downstream of the second driving device.

[0018] In a possible implementation, the third pipeline includes a first communication section and a second communication section;

[0019] An inlet end of the first communication section is in communication with the first pipe section, and an outlet end of the first communication section is in communication with the radiation monitoring tank;

[0020] The inlet end of the second communication section is in communication with the second pipe section, and the outlet end of the second communication section is in communication with the radiation monitoring tank.

[0021] In a possible implementation, the wastewater treatment system further comprises a drain detection member, which is in communication with the drain pipeline, and is configured to monitor whether the content of radioactive elements in the wastewater to be drained in the drain pipeline exceeds the second discharge value.

[0022] In a possible implementation, the wastewater treatment system further comprises a first communication pipeline, when the content of ammonia nitrogen in the wastewater to be drained in the radiation monitoring tank exceeds the first discharge value:

[0023] The inlet end of the first communication pipeline is in communication with the second pipeline, and the outlet end of the first communication pipeline is in communication with the ammonia nitrogen treatment tank.

[0024] In a possible implementation, the wastewater treatment system further comprises a water quality detection member, which is in communication with the first pipeline and the second pipeline, and is configured to monitor parameters of the wastewater to be drained in the first pipeline and the second pipeline, the parameters including the content of ammonia nitrogen and the pH value.

[0025] In a possible implementation, the wastewater treatment system further comprises a first liquid inlet pipe, a second liquid inlet pipe, a second communication pipeline, and a control valve, the first liquid inlet pipe is configured to be in communication with the ammonia nitrogen treatment tank, and is used to input the wastewater to be drained with the content of ammonia nitrogen exceeding the first discharge value into the ammonia nitrogen treatment tank;

[0026] The second liquid inlet pipe is configured to be in communication with the radiation monitoring tank, and is used to input the wastewater to be drained with the content of ammonia nitrogen not exceeding the first discharge value into the radiation monitoring tank;

[0027] The second communication pipeline communicates the first liquid inlet pipe and the second liquid inlet pipe; the control valve is arranged in the second communication pipeline, and is configured to change the flow direction of the wastewater to be drained in the second communication pipeline.

[0028] The wastewater treatment system provided by the embodiments of the present application integrates the ammonia-nitrogen treatment wastewater system and the radioactive wastewater treatment system in one system, processes the radioactive wastewater with excessive ammonia-nitrogen content through the first pipeline where the ammonia-nitrogen treatment tank is located, and monitors and stores the radioactive wastewater with excessive radioactivity through the second pipeline where the radiation monitoring tank is located; and the first pipeline and the second pipeline can be communicated, so that the wastewater with treated ammonia-nitrogen content up to the standard in the first pipeline can be transferred to the radiation monitoring tank for radioactivity monitoring, and the wastewater with excessive ammonia-nitrogen content in the second pipeline can be transferred to the ammonia-nitrogen treatment tank for ammonia-nitrogen treatment, so that the ammonia-nitrogen degradation and the radioactivity monitoring can be completed in the same system, the multiple transportation links are saved, the process is greatly simplified, and the treatment efficiency of the potential radioactive wastewater with excessive ammonia-nitrogen content is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0030] Figure 1 The pipeline structure schematic diagram of the wastewater treatment system provided by the embodiments of the present application.

[0031] Reference signs:

[0032] 10-ammonia-nitrogen treatment tank; 11-first dosing device; 12-first driving device; 13-first sampling device; 14-gas inlet stirring device;

[0033] 20-radiation monitoring tank; 21-second dosing device; 22-second driving device; 23-second sampling device; 24-pipeline mixer;

[0034] 30-water quality detection piece; 40-first liquid inlet pipe; 50-second liquid inlet pipe; 60-drainage detection piece;

[0035] 100-first pipeline; 200-second pipeline; 300-discharge pipeline; 310-first pipe section; 320-second pipe section; 400-third pipeline; 410-first communication section; 420-second communication section; 500-second communication pipeline; 510-control valve; 600-first communication pipeline.

[0036] The specific embodiments of the present application have been shown by the above drawings, and will be described in more detail hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0037] The exemplary embodiments will be described in detail herein with reference to the attached drawings. In the following description, like reference numerals refer to like elements, unless the context clearly dictates otherwise. The following description of exemplary embodiments is not representative of all possible embodiments consistent with the present application. Instead, it is merely intended to provide an example of apparatus and methods consistent with some aspects of the present application as detailed in the appended claims.

[0038] The terms "first", "second", "third", "fourth" and the like in the description and in the claims of the present application, and above attached drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the use of the terms so termed herein is used in a non-limiting sense and merely to distinguish one similar element from another as a convenience.

[0039] In the present application, the word "exemplary" or "for example" is used to mean an example, an illustration, or another non-limiting instance exemplified implementation. The use of these terms in this disclosure is not an indication of a preference or a favoring of exemplary or illustrative embodiments over other embodiments, nor is it intended to limit the scope of the present application in any way. Rather, these terms are simply used to provide examples, and are used as an illustration of the intended transition of the implementation, as opposed to a limitation.

[0040] The non-radioactive production wastewater system (WWS) is a special system in a nuclear power plant for treating non-radioactive production wastewater. Its core function is to collect, temporarily store, and monitor the radioactivity of various types of non-radioactive production wastewater generated during the operation of the nuclear power plant, such as treating potential radioactive wastewater discharged from the secondary loop system, so as to ensure that the wastewater is discharged in compliance with the discharge requirements after the radioactivity meets the discharge requirements, which is an important link for the wastewater treatment and environmental protection compliance of the nuclear power plant.

[0041] During the operation of the nuclear power plant, the secondary loop system is an important thermal cycle system connecting the steam generator and the steam turbine. Its main function is to transport high-temperature and high-pressure steam generated by the steam generator to the steam turbine to do work, drive the generator set to generate electricity, and then the steam is condensed into water and returned to the steam generator for recycling. The wastewater discharged from this system mainly includes system flushing water, leakage water, and drainage water. Although the secondary loop system does not directly contact nuclear fuel, its operating environment may be affected by occasional incidents such as small leaks of the steam generator heat transfer pipe, which may cause a small amount of radioactive substances to migrate to the secondary loop side. Therefore, the wastewater discharged from the secondary loop system is potential radioactive wastewater.

[0042] According to relevant regulations and specifications, the wastewater needs to be collected first, and then discharged into the non-radioactive production wastewater system. The radioactivity of the wastewater is monitored by the WWS, and only when the radioactivity meets the requirements can it be discharged. With the continuous improvement of environmental protection requirements, the ammonia nitrogen content of the above wastewater is also subject to clear discharge requirements. However, the existing WWS does not have the processing capacity for ammonia nitrogen exceeding the standard in wastewater, and cannot meet this new environmental protection standard.

[0043] In related technologies, some nuclear power plants set up a separate ammonia nitrogen wastewater treatment system to collect and treat high-ammonia-nitrogen wastewater in the plant. After the wastewater is treated in the ammonia nitrogen wastewater treatment system and meets the requirements, it is transported to the WWS for radioactivity monitoring before being discharged.

[0044] With the above scheme, it is necessary to first detect whether the ammonia nitrogen content in the wastewater meets the standard, and then decide whether to pass through the ammonia nitrogen wastewater treatment system. If the wastewater is detected to be high-ammonia-nitrogen wastewater, it needs to be collected and transported to the ammonia nitrogen wastewater treatment system first. After the wastewater is treated in the system and meets the requirements, it is transported to the WWS for treatment, and it is ensured that the wastewater meets the radioactivity index to meet the discharge requirements, and finally it is discharged in compliance.

[0045] Therefore, when using the above scheme to treat the ammonia-nitrogen-exceeding radioactive wastewater of the nuclear power plant, since the ammonia-nitrogen wastewater treatment system and the WWS are independent wastewater treatment systems, the process is relatively complex, and the wastewater needs to be transported between the two wastewater treatment systems, resulting in low efficiency of treating the wastewater. At the same time, the separately set ammonia-nitrogen wastewater treatment system occupies a lot of space in the plant, increases the complexity of the system, and needs to be invested in construction and maintenance.

[0046] In addition, the pH value of the non-radioactive production wastewater exceeds the standard, which is an occasional condition. The existing nuclear power plant usually sets up a separate wastewater neutralization tank near the WWS, or takes temporary measures such as temporary manual dosing and neutralization treatment, or transports the wastewater through a temporary pipeline to the condensate water treatment wastewater neutralization system for neutralization treatment. However, setting up a separate wastewater neutralization tank also has the problems of increasing construction cost and occupying space; and temporary measures have the problems of low processing efficiency and poor stability.

[0047] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific examples. The following specific examples can be combined with each other, and the same or similar concepts or processes may not be described again in some examples. The embodiments of the present application will be described below with reference to the accompanying drawings.

[0048] Please refer to Figure 1The wastewater treatment system provided by the embodiment comprises an ammonia-nitrogen treatment tank 10, a first dosing device 11, a first pipeline 100, a second pipeline 200, a third pipeline 400, a radiation monitoring tank 20, a second dosing device 21 and a discharge pipeline 300.

[0049] The ammonia-nitrogen treatment tank 10 can receive the wastewater to be discharged, which exceeds the first discharge value of ammonia-nitrogen content, and store it. The first discharge value is a value within the ammonia-nitrogen discharge standard.

[0050] The first dosing device 11 communicates with the ammonia-nitrogen treatment tank 10. During the storage of the wastewater to be discharged, the first dosing device 11 can add drugs to the ammonia-nitrogen treatment tank 10 to reduce the ammonia-nitrogen content in the wastewater to be discharged and adjust the pH value of the wastewater to be discharged. The first dosing device 11 can add corresponding drugs according to the actual ammonia-nitrogen concentration and pH value of the wastewater to be discharged. The added drugs can be ammonia-nitrogen oxidants, acid-base adjusting agents and the like.

[0051] The ammonia-nitrogen oxidants can convert the ammonia-nitrogen in the wastewater into harmless substances such as nitrogen gas through an oxidation reaction to reduce the ammonia-nitrogen content. The acid-base adjusting agent can be sodium hydroxide or sulfuric acid, which can adjust the pH value of the wastewater to the neutral range to solve the problem of excessive pH value of the wastewater.

[0052] The two ends of the first pipeline 100 can communicate with the ammonia-nitrogen treatment tank 10, and when the two ends of the first pipeline 100 communicate with the ammonia-nitrogen treatment tank 10, a first loop is formed with the ammonia-nitrogen treatment tank 10. The first pipeline 100 is a circulating pipeline, and the two ends thereof are connected to the water outlet and the water inlet of the ammonia-nitrogen treatment tank 10, respectively. It can be understood that the first pipeline 100 is provided with a circulating pump to drive the wastewater in the ammonia-nitrogen treatment tank 10 to flow in a circulating manner.

[0053] The radiation monitoring tank 20 is configured to store the wastewater to be discharged, which does not exceed the first discharge value of ammonia-nitrogen content. That is, the radiation monitoring tank 20 can be used to receive and store the wastewater, which does not exceed the first discharge value of ammonia-nitrogen content. The wastewater to be discharged is potential radioactive wastewater, which can be wastewater treated by the ammonia-nitrogen treatment tank 10 or wastewater whose ammonia-nitrogen content is detected to be within the standard.

[0054] After the wastewater to be discharged in the radiation monitoring tank 20 is mixed and stirred, the radioactive index of the wastewater is monitored. If the wastewater is qualified, it can be discharged; if the radioactivity of the wastewater to be discharged is unqualified, it is stored in the radiation monitoring tank and then transported to a radioactive treatment device for treatment. The radioactivity of the wastewater mainly refers to the tritium content in the wastewater.

[0055] The second pipeline 200 is communicated with the radiation monitoring tank 20 at both ends, and when the two ends of the second pipeline 200 are communicated with the radiation monitoring tank 20, a second loop is formed with the radiation monitoring tank 20; the second pipeline 200 is configured to be communicated with the first pipeline 100 when the ammonia-nitrogen content in the wastewater to be discharged in the radiation monitoring tank 20 exceeds the first discharge value, and to be communicated with the first pipeline 100 when the ammonia-nitrogen content in the wastewater to be discharged in the ammonia-nitrogen treatment tank 10 is lower than the first discharge value.

[0056] The two ends of the second pipeline 200 are connected with the water outlet and the water inlet of the radiation monitoring tank 20 respectively, forming a closed second pipeline 200. When the wastewater in the radiation monitoring tank 20 exceeds the first discharge value due to the ammonia-nitrogen content, the second pipeline 200 can be switched to be communicated with the first pipeline 100 through the valve, so as to transport the wastewater with excessive ammonia-nitrogen to the ammonia-nitrogen treatment tank 10 for reprocessing, avoiding the wastewater with excessive ammonia-nitrogen content from being discharged without processing. When the ammonia-nitrogen content in the wastewater to be discharged in the ammonia-nitrogen treatment tank 10 is lower than the first discharge value, the second pipeline 200 is switched to be communicated with the first pipeline 100 through the valve, so as to make the wastewater with standard ammonia-nitrogen flow into the radiation monitoring tank 20 for processing, avoiding the wastewater with excessive radioactive element content from being discharged without processing.

[0057] The second dosing device 21 is communicated with the second pipeline 200, and the second dosing device 21 is configured to add a drug into the radiation monitoring tank 20, so as to adjust the pH value of the wastewater to be discharged. The second dosing device 21 is communicated with the second pipeline 200, and is composed of a pH regulator storage tank and a quantitative dosing device, which functions to supplement and adjust the pH value when the pH value in the radiation monitoring tank 20 exceeds the standard.

[0058] The discharge pipeline 300 is configured to be communicated with at least one of the first pipeline 100 and the second pipeline 200 when the ammonia-nitrogen content in the wastewater to be discharged does not exceed the first discharge value, and the radioactive element content does not exceed the second discharge value.

[0059] The discharge pipeline 300 is an output channel of the finally qualified wastewater, and the inlet end thereof can be connected with the outlet of the ammonia-nitrogen treatment tank 10 and the outlet of the radiation monitoring tank 20 through the valve respectively, i.e. connected with the water outlet of the ammonia-nitrogen treatment tank 10 and the water outlet of the radiation monitoring tank 20. When the wastewater meets the condition that the ammonia-nitrogen content does not exceed the first discharge value and the radioactive element content does not exceed the second discharge value, the valve of the discharge pipeline 300 is automatically opened.

[0060] The third pipeline 400 is a reflux pipeline, one end of which is connected with a middle monitoring point of the discharge pipeline 300, and the other end of which is connected with a reflux port or a water inlet of the radiation monitoring tank 20. When the radioactive element content in the wastewater to be discharged in the discharge pipeline 300 exceeds the second discharge value, the two ends of the third pipeline 400 are configured to be communicated with the discharge pipeline 300 and the radiation monitoring tank 20 respectively.

[0061] Specifically, the wastewater treatment system of the embodiment works as follows:

[0062] If the ammonia-nitrogen content of the wastewater discharged by the secondary loop system of the nuclear power plant is determined to exceed the first discharge value, the wastewater is directly delivered to the ammonia-nitrogen treatment tank 10; if the ammonia-nitrogen content is not determined to exceed the first discharge value, the wastewater is directly delivered to the radiation monitoring tank 20. Specifically, the following two processes can be performed.

[0063] When the ammonia-nitrogen content of the potential radioactive wastewater is determined to exceed the first discharge value, the radioactive wastewater is introduced into the ammonia-nitrogen treatment tank 10, and the ammonia-nitrogen oxidant and the acid-base regulator are added by the first dosing device 11, so that the wastewater is fully reacted in the ammonia-nitrogen treatment tank 10. After the treatment of the ammonia-nitrogen treatment tank 10, the wastewater with standard ammonia-nitrogen is introduced into the radiation monitoring tank 20, and the radiation detector monitors the content of radioactive elements in real time. If the ammonia-nitrogen content, pH value and radioactivity of the wastewater all meet the standards, the wastewater can be directly discharged through the discharge pipeline 300.

[0064] When the ammonia-nitrogen content of the potential radioactive wastewater discharged by the secondary loop system of the nuclear power plant is not determined to exceed the first discharge value, the wastewater is introduced into the radiation monitoring tank 20, and if the ammonia-nitrogen content of the radioactive wastewater is determined to exceed the first discharge value, the second pipeline 200 is connected with the first pipeline 100, and then the radioactive wastewater is transferred to the ammonia-nitrogen treatment tank 10 to treat the ammonia-nitrogen in the radioactive wastewater. After the treatment of the ammonia-nitrogen treatment tank 10, the wastewater with standard ammonia-nitrogen is introduced into the radiation monitoring tank 20 to monitor the radioactive substances, and then when the ammonia-nitrogen content, pH value and radioactivity of the wastewater all meet the standards, the wastewater is directly discharged through the discharge pipeline 300.

[0065] If the radioactivity of the wastewater to be discharged exceeds the standard, the first pipeline 100 is connected with the second pipeline 200, and the wastewater is backflowed to the radiation monitoring tank 20, so that the radioactive elements contained in the wastewater can be treated subsequently to ensure that the radioactivity index meets the standards.

[0066] If the radioactivity of the wastewater to be discharged is determined to exceed the standard in the discharge pipeline 300, the third pipeline 400 can backflow the wastewater to the radiation monitoring tank 20 to store the wastewater, so that the radioactive elements contained in the wastewater can be treated subsequently by other processes to ensure that the radioactivity index meets the standards.

[0067] Therefore, the wastewater treatment system provided by the embodiment integrates the ammonia-nitrogen treatment wastewater system and the radioactive wastewater treatment system in one system, treats the potential radioactive wastewater with excessive ammonia-nitrogen through the first pipeline 100 where the ammonia-nitrogen treatment tank 10 is located, and monitors and stores the potential radioactive wastewater through the second pipeline 200 where the radiation monitoring tank 20 is located; and the first pipeline 100 and the second pipeline 200 can be communicated, so that the wastewater with excessive radioactivity in the first pipeline 100 can be stored in the radiation monitoring tank 20 in time, and the wastewater with excessive ammonia-nitrogen in the second pipeline 200 can be transferred to the ammonia-nitrogen treatment tank 10, so that the ammonia-nitrogen degradation, the radioactive wastewater monitoring, and the storage of the wastewater with excessive radioactivity can be completed in the same system, the multiple transportation links are saved, the process is greatly simplified, and the ammonia-nitrogen treatment efficiency of the potential radioactive wastewater is effectively improved.

[0068] In addition, in the related art, the pH value exceeding the standard relies on temporary manual dosing or temporary pipeline transportation, and there are problems of low efficiency and poor stability. The embodiment synchronously adjusts the pH value in the ammonia-nitrogen treatment tank 10 through the first dosing device 11 and adjusts the pH value in the radiation monitoring tank 20 through the second dosing device 21, so as to ensure the stable and reliable pH value adjustment.

[0069] It should be noted that the pipeline and the loop in the above and the following can be controlled by setting a pipeline control valve on the pipeline, so as to control the on-off state of the pipeline and the loop. The pipeline and the loop can also be provided with a water pump to provide power for wastewater transportation and transfer. The specific types of the pipeline control valve and the water pump are determined according to actual use requirements, and no specific limitation is made.

[0070] In some optional embodiments, the discharge pipeline 300 includes a first pipe section 310 and a second pipe section 320, the inlet end of the first pipe section 310 is configured to be communicated with the first pipeline 100, the outlet end of the first pipe section 310 is communicated with the second pipe section 320, and the inlet end of the second pipe section 320 is configured to be communicated with the second pipeline 200.

[0071] When the wastewater treated by the ammonia-nitrogen treatment tank 10 in the first pipeline 100 is qualified and the radioactivity is up to the standard and needs to be discharged, the valve at the inlet end of the first pipe section 310 is opened, the wastewater flows into the second pipe section 320 through the first pipe section 310, and is finally discharged; when the wastewater treated by the radiation monitoring tank 20 in the second pipeline 200 is qualified and the ammonia-nitrogen content is up to the standard and needs to be discharged, the valve connected between the second pipe section 320 and the second pipeline 200 is opened, and the wastewater directly enters the second pipe section 320 for discharge; if there are qualified wastewaters in both the first pipeline 100 and the second pipeline 200, the valve opening degree can be adjusted through the flow sensor to realize synchronous discharge.

[0072] The first pipe section 310 can control the wastewater discharge of the ammonia-nitrogen treatment tank 10, and the second pipe section 320 can control the wastewater discharge of the radiation monitoring tank 20. Thus, the physical paths of the wastewater discharged from the first pipe 100 and the second pipe 200 are separated to avoid the mixing of the wastewater from different treatment stages before discharge, so that the radioactive indicators can be detected again before the wastewater is discharged, and the stability of the indicators of the wastewater before entering the discharge terminal can be ensured.

[0073] The discharge pipe 300 can include the first pipe section 310, the second pipe section 320, and a main pipe, the first pipe section 310 and the second pipe section 320 are in communication with the main pipe, and the first pipe section 310 and the second pipe section 320 can be branch pipe sections of the main pipe. In this way, the discharge pipe 300 can control the opening and closing of the two pipe sections and the main pipe.

[0074] In some optional embodiments, the wastewater treatment system further includes a first driving device 12, the first driving device 12 is in communication with the first pipe 100, and the first driving device 12 is configured to drive the wastewater to be discharged flowing through the first pipe 100 to the ammonia-nitrogen treatment tank 10 or the first pipe section 310.

[0075] The first driving device 12 can provide directional flow power for the wastewater to be discharged in the first pipe 100. When the wastewater in the first pipe 100 is monitored and found that the ammonia-nitrogen content exceeds the first discharge value, under the action of the first driving device 12, the wastewater of the first pipe 100 can flow back to the ammonia-nitrogen treatment tank 10 again.

[0076] Alternatively, when the wastewater in the first pipe 100 is monitored and found that the ammonia-nitrogen content exceeds the first discharge value, under the action of the first driving device 12, the wastewater is transported to the discharge pipe through the first pipe section 310.

[0077] The first driving device 12 can provide directional flow power for the wastewater to be discharged in the first pipe 100. When the wastewater in the first pipe 100 is monitored and found that the ammonia-nitrogen content exceeds the first discharge value, under the action of the first driving device 12, the wastewater of the first pipe 100 can flow back to the ammonia-nitrogen treatment tank 10 again.

[0078] The first driving device 12 can provide directional flow power for the wastewater to be discharged in the first pipe 100. When the wastewater in the first pipe 100 is monitored and found that the ammonia-nitrogen content exceeds the first discharge value, under the action of the first driving device 12, the wastewater of the first pipe 100 can flow back to the ammonia-nitrogen treatment tank 10 again.

[0079] In some optional embodiments, the wastewater treatment system further includes a second driving device 22, the second driving device 22 is in communication with the second pipe 200, and the second driving device 22 is configured to drive the wastewater to be discharged flowing through the second pipe 200 to the radiation monitoring tank 20 or the second pipe section 320.

[0080] The second driving device 22 can provide directional conveying power for the to-be-discharged wastewater flowing out of the second pipeline 200, so that the to-be-discharged wastewater of the second pipeline 200 flows back to the radiation monitoring box 20 or is conveyed to the discharge pipeline 300 through the second pipe section 320. Among them, the second driving device 22 can adopt the same component parts as the first driving device 12 to realize the above functions.

[0081] In some optional embodiments, the second dosing device 21 is located downstream of the second driving device 22 in the second pipeline 200.

[0082] Among them, the second dosing device 21 located downstream of the second driving device 22 means that the second dosing device 21 is equivalent to the second driving device 22 and is located on one side of the to-be-discharged wastewater flowing direction in the second pipeline 200.

[0083] In the above structure, the stable water flow power provided by the second driving device 22 is conducive to improving the mixing efficiency of the medicament and the wastewater. When the second driving device 22 drives the wastewater to flow to the radiation monitoring box 20, the water flow forms a stable flow rate under the pressure of the pump body, and at this time, the medicament added by the second dosing device 21 can be uniformly dispersed with the water flow, avoiding local aggregation of the medicament due to turbulent water flow.

[0084] In some optional embodiments, the third pipeline 400 includes a first communication section 410 and a second communication section 420.

[0085] The first communication section 410 can communicate the first pipe section 310 with the radiation monitoring box 20, the inlet end of the first communication section 410 communicates with the first pipe section 310, and the outlet end of the first communication section 410 communicates with the radiation monitoring box 20.

[0086] After the ammonia-nitrogen treatment box 10 processes the to-be-discharged wastewater with excessive ammonia-nitrogen, if the ammonia-nitrogen content in the to-be-discharged wastewater does not exceed the first discharge value, the to-be-discharged wastewater can be conveyed to the radiation monitoring box 20 through the first pipe section 310, so as to facilitate subsequent monitoring of the radioactivity of the to-be-discharged wastewater.

[0087] The second communication section 420 can communicate the discharge pipeline 300 with the radiation monitoring box 20, that is, the inlet end of the second communication section 420 communicates with the second pipe section 320, and the outlet end of the second communication section 420 communicates with the radiation monitoring box 20.

[0088] When the radioactivity detection of the to-be-discharged wastewater discharged by the second pipeline 200 does not meet the standard, the to-be-discharged wastewater can flow back to the radiation monitoring box 20 through the second communication section 420, so as to avoid direct discharge of the potential radioactive wastewater with excessive radioactivity, and facilitate subsequent processing of the to-be-discharged wastewater in the radiation monitoring box 20 by other devices to make its radioactivity meet the standard.

[0089] In some embodiments, the ammonia-nitrogen treatment tank 10 further comprises a first sampling device 13 and an air inlet stirring device 14.

[0090] The ammonia-nitrogen treatment tank 10 is provided with a sampling port, and the first sampling device 13 is in communication with the sampling port, so that the first sampling device 13 can sample the to-be-discharged wastewater in the ammonia-nitrogen treatment tank 10 to detect the pH value and the tritium content of the to-be-discharged wastewater.

[0091] The ammonia-nitrogen treatment tank 10 is provided with an air inlet, and the output end of the air inlet stirring device 14 is connected to the air inlet. The air inlet stirring device 14 can introduce stirring air into the ammonia-nitrogen treatment tank 10 to stir the to-be-discharged wastewater in the ammonia-nitrogen treatment tank 10. The air inlet stirring device 14 can include a Roots blower, which can be used to deliver stirring air into the ammonia-nitrogen treatment tank 10.

[0092] In some embodiments, the radiation monitoring tank 20 further comprises a second sampling device 23 and a pipeline mixer 24. The radiation monitoring tank 20 is provided with a sampling port, and the second sampling device 23 is in communication with the sampling port, so that the second sampling device 23 can sample the to-be-discharged wastewater in the radiation monitoring tank 20 to detect the pH value and the tritium content of the to-be-discharged wastewater.

[0093] The pipeline mixer 24 can be arranged at the outlet end of the second dosing device 21 and on the second pipeline 200. When the second dosing device 21 discharges the medicament into the second pipeline 200, the pipeline mixer 24 can fully mix the medicament with the to-be-discharged wastewater in the second pipeline 200.

[0094] In some optional embodiments, the wastewater treatment system further comprises a drainage detection member 60, which is in communication with the discharge pipeline 300 and is configured to monitor whether the content of radioactive elements in the to-be-discharged wastewater in the discharge pipeline 300 exceeds a second discharge value.

[0095] The drainage detection member 60 is used to detect the content of radioactive elements in the to-be-discharged wastewater in the discharge pipeline 300. For example, the drainage detection member 60 can include a radioactive detector and a water sample collection unit. The radioactive detector can identify γ rays, β rays, etc. in the wastewater, covering the energy range of common radioactive nuclides such as tritium, cesium, and strontium in nuclear power plants. The water sample collection unit can include a sampling pump and a flow cell. The sampling pump can introduce the to-be-discharged wastewater in the discharge pipeline 300 into the flow cell, so that the radioactive detector can continuously contact the water sample.

[0096] In some optional embodiments, the wastewater treatment system further comprises a first communication pipeline 600. When the content of ammonia-nitrogen in the to-be-discharged wastewater in the radiation monitoring tank 20 exceeds a first discharge value, the inlet end of the first communication pipeline 600 is in communication with the second pipeline 200, and the outlet end of the first communication pipeline 600 is in communication with the ammonia-nitrogen treatment tank 10.

[0097] The first communication pipeline 600 communicates the second pipeline 200 with the ammonia-nitrogen treatment tank 10. When the ammonia-nitrogen monitoring device in the radiation monitoring tank 20 detects that the ammonia-nitrogen content of the wastewater exceeds the first discharge value, the control valve 510 on the first communication pipeline 600 is opened, and the first communication pipeline 600 can be provided by the water pump to transport the wastewater exceeding the standard in the radiation monitoring tank 20 from the second pipeline 200 to the first communication pipeline 600, and then to the ammonia-nitrogen treatment tank 10 through the first communication pipeline 600.

[0098] The first communication pipeline 600 in the embodiment forms part of the reflux channel, which helps to solve the problem of secondary treatment of wastewater exceeding the ammonia-nitrogen standard in the radiation monitoring tank 20, further improves the closed-loop treatment capability of the system, and improves the stability and economy of the nuclear power plant wastewater treatment.

[0099] In some optional embodiments, the wastewater treatment system further comprises a water quality detection member 30, which communicates with the first pipeline 100 and the second pipeline 200, and is configured to monitor the parameters of the wastewater to be discharged in the first pipeline 100 and the second pipeline 200, including the ammonia-nitrogen content and the pH value.

[0100] The water quality detection member 30 can be arranged on a pipeline, and the two ends of the pipeline communicate with the first pipeline 100 and the second pipeline 200 respectively, so as to realize real-time double-path monitoring of the ammonia-nitrogen content and the pH value of the wastewater to be discharged in the first pipeline 100 and the second pipeline 200, and provide a basis for the dosing control and loop switching of the system.

[0101] For example, the water quality detection member 30 comprises an ammonia-nitrogen detector and a pH sensor, the ammonia-nitrogen detector can adopt the Nash colorimetric method or the salicylic acid spectrophotometric method to realize real-time monitoring of the ammonia-nitrogen concentration in the wastewater.

[0102] In some optional embodiments, the wastewater treatment system further comprises a first liquid inlet pipe 40, a second liquid inlet pipe 50, a second communication pipeline 500, and a control valve 510.

[0103] The first liquid inlet pipe 40 is configured to communicate with the ammonia-nitrogen treatment tank 10, and is used to input the wastewater to be discharged with ammonia-nitrogen content exceeding the first discharge value into the ammonia-nitrogen treatment tank 10.

[0104] The first liquid inlet pipe 40 is specially used to transport the wastewater to be discharged with ammonia-nitrogen content exceeding the first discharge value, and is a special channel for high-ammonia-nitrogen wastewater to enter the treatment system. One end of the first liquid inlet pipe 40 is connected with the wastewater discharge port of the nuclear power plant secondary loop system, and the other end communicates with the liquid inlet of the ammonia-nitrogen treatment tank 10. A flow meter can be arranged on the pipeline to monitor the wastewater flow entering the ammonia-nitrogen treatment tank 10, and the pipe diameter is designed according to the maximum discharge amount of high-ammonia-nitrogen wastewater to ensure the continuous feeding requirement.

[0105] The second liquid inlet pipe 50 is configured to be in communication with the radiation monitoring tank 20, and is used to input the wastewater to be discharged with ammonia-nitrogen content not exceeding the first discharge value into the radiation monitoring tank 20.

[0106] The second liquid inlet pipe 50 can be used to directly deliver the wastewater to be discharged with ammonia-nitrogen content not exceeding the first discharge value to the radiation monitoring tank 20. One end of the second liquid inlet pipe 50 is connected to other low-ammonia-nitrogen wastewater discharge sources of the nuclear power plant, and the other end is in communication with the liquid inlet of the radiation monitoring tank 20. A filter can be provided on the second liquid inlet pipe 50 to remove suspended particulate matters in the wastewater, so as to avoid clogging the monitoring device in the radiation monitoring tank 20.

[0107] The second communication pipeline 500 is in communication with the first liquid inlet pipe 40 and the second liquid inlet pipe 50, and the control valve 510 is arranged in the second communication pipeline 500 and is configured to change the flow direction of the wastewater to be discharged in the second communication pipeline 500.

[0108] The second communication pipeline 500 can be connected with the first liquid inlet pipe 40 and the second liquid inlet pipe 50 through three-way joints at both ends, respectively. The control valve 510 can be an electric three-way ball valve integrated in the middle section of the second communication pipeline 500, and has a closed position, a forward conduction position and a reverse conduction position, which can be remotely controlled by a system central controller.

[0109] When the control valve 510 is in the closed position, the second communication pipeline 500 can be cut off; when the control valve 510 is in the forward conduction position, the wastewater can be allowed to flow from the first liquid inlet pipe 40 to the second liquid inlet pipe 50; and when the control valve 510 is in the reverse conduction position, the wastewater can be allowed to flow from the second liquid inlet pipe 50 to the first liquid inlet pipe 40.

[0110] The embodiment realizes flexible switching of the wastewater delivery path through the first liquid inlet pipe 40, the second liquid inlet pipe 50 and the second communication pipeline 500, and through the control valve 510, effectively solves the problems of path fixation, low fault tolerance and complicated transfer of the traditional system, and further improves the adaptability and economy of the wastewater treatment system. Finally, it should be noted that other embodiments of the present application will be easily conceived by those skilled in the art after considering the specification and practicing the application disclosed herein. The present application is intended to cover any variations, uses or adaptive changes of the present application, which follow the general principles of the present application and include common knowledge or conventional technical means in the art not disclosed by the present application, and is not limited to the precise structure described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is only limited by the appended claims.

Claims

1. A wastewater treatment system, characterized by, The application relates to a waste water treatment device, which comprises: an ammonia-nitrogen treatment tank (10) configured to store waste water to be discharged, the ammonia-nitrogen content of which exceeds a first discharge value; a first dosing device (11) in communication with the ammonia-nitrogen treatment tank (10), the first dosing device (11) being configured to add a medicament into the ammonia-nitrogen treatment tank (10) to reduce the ammonia-nitrogen content of the waste water to be discharged and adjust the pH value of the waste water to be discharged; a first pipeline (100), both ends of the first pipeline (100) being in communication with the ammonia-nitrogen treatment tank (10), and when both ends of the first pipeline (100) are in communication with the ammonia-nitrogen treatment tank (10), a first loop is formed between the first pipeline (100) and the ammonia-nitrogen treatment tank (10); a radiation monitoring tank (20) configured to store waste water to be discharged, the ammonia-nitrogen content of which does not exceed the first discharge value; a second pipeline (200), both ends of the second pipeline (200) being in communication with the radiation monitoring tank (20), and when both ends of the second pipeline (200) are in communication with the radiation monitoring tank (20), a second loop is formed between the second pipeline (200) and the radiation monitoring tank (20); the second pipeline (200) is configured to be in communication with the first pipeline (100) when the ammonia-nitrogen content of the waste water to be discharged in the radiation monitoring tank (20) exceeds the first discharge value or when the ammonia-nitrogen content of the waste water to be discharged in the ammonia-nitrogen treatment tank (10) is lower than the first discharge value; a second dosing device (21) in communication with the second pipeline (200), the second dosing device (21) being configured to add a medicament into the radiation monitoring tank (20) to adjust the pH value of the waste water to be discharged; a discharge pipeline (300) configured to be in communication with the first pipeline (100) and / or the second pipeline (200) when the ammonia-nitrogen content of the waste water to be discharged does not exceed the first discharge value and the content of radioactive elements does not exceed a second discharge value; a third pipeline (400), both ends of the third pipeline (400) being configured to be in communication with the discharge pipeline (300) and the radiation monitoring tank (20) respectively when the content of radioactive elements of the waste water to be discharged in the discharge pipeline (300) exceeds the second discharge value.

2. The wastewater treatment system of claim 1, wherein, The discharge pipeline (300) comprises a first pipe section (310) and a second pipe section (320), the inlet end of the first pipe section (310) being configured to be in communication with the first pipeline (100), and the outlet end of the first pipe section (310) being in communication with the second pipe section (320); the inlet end of the second pipe section (320) being configured to be in communication with the second pipeline (200).

3. The wastewater treatment system of claim 2, wherein, The application further comprises a first driving device (12) in communication with the first pipeline (100), the first driving device (12) being configured to drive the waste water to flow to the ammonia-nitrogen treatment tank (10) or the first pipe section (310).

4. The wastewater treatment system of claim 2, wherein, The second driving device (22) is in communication with the second pipeline (200), and is configured to drive the flow of the waste water in the second pipeline (200) to the radiation monitoring box (20) or the second pipe section (320).

5. The wastewater treatment system of claim 4, wherein, The second dosing device (21) is located downstream of the second driving device (22) in the second pipeline (200).

6. The wastewater treatment system of claim 2, wherein, The third pipeline (400) comprises a first communication section (410) and a second communication section (420); The inlet end of the first communication section (410) is in communication with the first pipe section (310), and the outlet end of the first communication section (410) is in communication with the radiation monitoring box (20); The inlet end of the second communication section (420) is in communication with the second pipe section (320), and the outlet end of the second communication section (420) is in communication with the radiation monitoring box (20).

7. The wastewater treatment system of any one of claims 1-6, wherein, The drainage detection member (60) is in communication with the discharge pipeline (300), and is configured to monitor whether the content of the radioactive element in the waste water in the discharge pipeline (300) exceeds the second discharge value.

8. The wastewater treatment system of any one of claims 1-6, wherein, When the content of ammonia nitrogen in the waste water in the radiation monitoring box (20) exceeds the first discharge value, the first communication pipeline (600) is provided. The inlet end of the first communication pipeline (600) is in communication with the second pipeline (200), and the outlet end of the first communication pipeline (600) is in communication with the ammonia nitrogen treatment box (10).

9. The wastewater treatment system of any one of claims 1-6, wherein, The water quality detection member (30) is in communication with the first pipeline (100) and the second pipeline (200), and is configured to monitor the parameters of the waste water in the first pipeline (100) and the second pipeline (200), which include the content of ammonia nitrogen and the pH value.

10. The wastewater treatment system of any one of claims 1-6, wherein, The first liquid inlet pipe (40) is configured to be in communication with the ammonia nitrogen treatment box (10), and is used to input the waste water with the content of ammonia nitrogen exceeding the first discharge value into the ammonia nitrogen treatment box (10); The second liquid inlet pipe (50) is configured to be in communication with the radiation monitoring box (20), and is used to input the waste water with the content of ammonia nitrogen not exceeding the first discharge value into the radiation monitoring box (20); The second communication pipeline (500) communicates the first liquid inlet pipe (40) and the second liquid inlet pipe (50), and the control valve (510) is arranged in the second communication pipeline (500) and is configured to change the flow direction of the waste water in the second communication pipeline (500).

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