Ammonia distillation wastewater purification treatment system

Abstract

The utility model relates to an ammonia distillation wastewater purification treatment system, and aims to solve the technical problems of low purification efficiency, high input cost and complex flow in the existing ammonia distillation wastewater purification treatment process. The ammonia distillation wastewater purification treatment system comprises a medicament feeding mechanism, a reaction tank provided with a stirrer, at least one stage of sedimentation tank, at least one stage of non-compression type fiber ball filter and a circulating water tank which are correspondingly communicated in sequence, and ammonia distillation wastewater to be treated is introduced into the reaction tank through a wastewater conveying pipeline; a corresponding ammonia nitrogen removing agent is put into the reaction tank by the agent putting mechanism according to a certain proportion for chemical reaction, and then is sequentially treated by the at least one stage of sedimentation tank and the at least one stage of non-compression type fiber ball filter and then is introduced into the circulating water tank. The reaction tank, the sedimentation tank and the non-compression type fiber ball filter are organically and integrally arranged, the purpose of wastewater purification is achieved through chemical reaction, sedimentation and fiber ball filtration, and the device has the advantages of being high in purification efficiency, simple in process operation and low in input cost.

Description

Technical Field

[0001] The present application relates to the field of coking wastewater treatment, and in particular to a system for purifying and treating ammonia evaporation wastewater. Background Art

[0002] Coking wastewater is industrial wastewater produced by the high-temperature distillation process of coal in the coking industry and the subsequent coal gas purification, chemical product recovery and other processes. It contains high concentrations of pollutants such as organic matter, phenols, ammonia nitrogen, cyanide, polycyclic aromatic hydrocarbons, etc. These pollutants are difficult to degrade, highly toxic and highly corrosive, making coking wastewater a toxic and harmful industrial wastewater that is difficult to treat.

[0003] Ammonia evaporation wastewater is a type of wastewater treatment process in coking, and it is mainly composed of ammonia nitrogen organic pollutants. It comes from the water added in the coal blending process and the bound water in the coal. At present, the treatment methods for ammonia evaporation wastewater mainly include two categories: physical and chemical methods and biological methods. Among them, the physical and chemical methods include air stripping method, MAP method, breakpoint chlorination method, membrane absorption method, ammonia evaporation method, etc. These methods remove ammonia nitrogen through physical or chemical reactions; biological methods include anaerobic ammonia oxidation technology, AO (anaerobic aerobic) or AAO (anaerobic-anoxic-aerobic) method, membrane bioreactor method, etc. These methods remove ammonia nitrogen through microbial metabolic activities. Although these methods are relatively mature in removing ammonia nitrogen, they usually have high energy consumption, the equipment is susceptible to corrosion, and the operation and maintenance costs are high. In addition, the difficult-to-degrade organic matter and highly toxic substances such as phenols and cyanides in ammonia evaporation wastewater have an inhibitory effect on microorganisms, resulting in low efficiency of biochemical treatment, and the treated effluent may still contain a certain amount of harmful substances, which is difficult to fully meet environmental protection emission standards.

[0004] The inventors are aware of a coking wastewater treatment process (CN 117023889 A), which achieves the purpose of treating and purifying coking wastewater through pretreatment, biochemical treatment, deep treatment and other processes. However, in the process of realizing the technical solution in the embodiment of the present application, the inventors of the present application found that the above technology has at least the following technical problems: after adding coke powder to the ammonia evaporated wastewater and stirring it, a static method is used to obtain the primary treated ammonia evaporated wastewater, the primary treated ammonia evaporated wastewater is fitted with activated sludge, and after primary precipitation, a denitrification reaction or a nitrification reaction is carried out, and after the end, a secondary precipitation is carried out by static method, resulting in low purification efficiency of the ammonia evaporated wastewater, a long time consumption, and it is difficult to meet the needs of timely treatment of a large amount of wastewater. In addition, the ammonia vapor wastewater is pretreated to form primary treated ammonia vapor wastewater, which is then fitted with activated sludge, followed by denitrification and nitrification reactions, and then secondary precipitation. The supernatant after the secondary precipitation enters the multi-media-ultrafiltration-reverse osmosis treatment and is reused after treatment. The concentrated brine enters the secondary reverse osmosis, and the secondary reverse osmosis product water enters the reuse water pool. The ultra-concentrated brine undergoes secondary deep treatment and enters the multiphase Fenton reactor. Ferric chloride, ferrous sulfate and hydrogen peroxide are added successively to react, and then flocculants are continued to be added for coagulation and precipitation. The supernatant after the secondary deep treatment is discharged, and activated carbon is added thereto, and it is discharged after meeting the standards, resulting in complicated treatment procedures, complicated operations, high purification treatment costs, and increased personnel maintenance.

[0005] The information disclosed in this background technology section is only used to deepen the understanding of the background technology of the present disclosure, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art known to those skilled in the art. Summary of the invention

[0006] In view of at least one of the above technical problems, the present disclosure provides an ammonia evaporation wastewater purification treatment system, aiming to solve the technical problems of low efficiency, complicated process and high investment cost in the existing ammonia evaporation wastewater purification treatment process.

[0007] According to one aspect of the present disclosure, a system for purifying and treating ammonia vapor wastewater is provided, comprising a reagent dosing mechanism, a reaction tank provided with a stirrer, at least one level of sedimentation tank, at least one level of non-compacted fiber ball mechanical filter, and a circulating water tank, which are connected in sequence; the reagent dosing mechanism comprises a reagent dilution tank and a pressure pump / metering pump connected in corresponding pipes; after the ammonia vapor wastewater to be treated is introduced into the reaction tank through a corresponding wastewater conveying pipeline, the reagent dosing mechanism proportionally adds a corresponding ammonia nitrogen remover into the reaction tank for chemical reaction, and then the wastewater is introduced into the circulating water tank after being treated in the at least one level of sedimentation tank and at least one level of non-compacted fiber ball filter in sequence.

[0008] In some embodiments of the present disclosure, the sedimentation tank is a radial flow sedimentation tank.

[0009] In some embodiments of the present disclosure, corresponding scrapers and sludge conveyors are installed in the sedimentation tank.

[0010] In some embodiments of the present disclosure, a first booster pump is installed in the wastewater conveying pipeline between the sedimentation tank and the non-compression fiber ball filter; and a second booster pump is installed between the non-sedimentation fiber ball filter and the circulating water tank.

[0011] In some embodiments of the present disclosure, an ammonia nitrogen remover is attached to the fiber balls filled in the non-compression fiber ball filter.

[0012] In some embodiments of the present disclosure, a corresponding flushing and drainage pipeline is provided between the non-compression fiber ball filter and the sedimentation tank to complete the flushing of the sedimentation tank.

[0013] In some embodiments of the present disclosure, a corresponding backwashing pipeline is provided between the circulating water pool and the non-compression fiber ball filter to achieve backwashing of the non-compression fiber ball filter.

[0014] In some embodiments of the present disclosure, a corresponding backup pipeline with a valve is provided between the water inlet and the water outlet of the non-compression fiber ball filter.

[0015] In some embodiments of the present disclosure, a sampling port is provided at the water outlet of the non-compression fiber ball filter.

[0016] One or more technical solutions provided in the embodiments of the present application have at least any of the following technical effects or advantages:

[0017] 1. The reaction tank, sedimentation tank and non-compression fiber ball filter are organically integrated and arranged. Through reagent reaction, sedimentation and fiber ball filtration, the process is simple and can effectively enhance the purification effect of ammonia evaporation wastewater, so that the purified ammonia evaporation wastewater can enter the circulating water tank for use as recycled water, and can be further pressurized by the newly added first booster pump and the second booster pump, which greatly improves the transportation efficiency of wastewater, shortens the wastewater purification treatment time, and solves the technical problems of complex and time-consuming ammonia evaporation wastewater treatment process in the prior art.

[0018] 2. Since a stirrer is installed in the reaction tank, the ammonia wastewater and the ammonia nitrogen remover can fully react through stirring, which helps to speed up the reaction rate and shorten the treatment time of the ammonia wastewater.

[0019] 3. Since the non-compression fiber ball filter is filled with fiber balls with ammonia nitrogen removers, the filtering and adsorption effects of the fiber balls further enhance the purification effect of ammonia wastewater. At the same time, the fiber balls can be reused, which helps to save investment costs.

[0020] 4. Since a pressure gauge is provided between the first booster pump and the non-compression fiber ball filter, the blockage of impurities in the non-compression fiber ball filter can be judged according to the changes in the pressure gauge value, so that backwashing can be carried out in time and the sedimentation tank can be flushed and drained, thereby improving the purification efficiency of ammonia wastewater and enhancing the wastewater purification effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic structural diagram of a single-stage purification treatment system for ammonia wastewater in one embodiment of the present application.

[0022] Figure 2 This is a schematic diagram of the structure of a multi-stage purification treatment system for ammonia wastewater in one embodiment of the present application.

[0023] In the above figures: 1. Chemical dilution tank; 2. Chemical dosing pump; 3. Reaction tank; 31. Agitator; 4. Overflow port; 5. Sedimentation tank; 51. Sludge scraper; 52. Sludge conveyor; 6. First pressure pump; 7. Non-compression fiber ball filter; 8. Second pressure pump; 9. Flushing and drainage pipeline; 10. Spare pipeline; 11. Backwash pipeline. DETAILED DESCRIPTION

[0024] The terms "first", "second", etc. mentioned in this application are used to distinguish the objects described and do not have any order or technical meaning. The terms "connection" and "connection" mentioned in this application include direct and indirect connections (connections) unless otherwise specified.

[0025] It should be noted that the diagrams provided in this application are only used to illustrate the basic concept of this application in a schematic manner, so the diagrams only show the components related to this application rather than being drawn according to the number, shape and size of the components in actual implementation. The type, quantity and proportion of each component in actual implementation can be changed at will, and the layout of the components may also be more complicated. The structure, proportion, size, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the restrictive conditions that can be implemented in this application, so they have no technical substantive significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed in this application without affecting the effect and purpose that can be achieved by this application.

[0026] In order to better understand the technical solution of the present application, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Example 1

[0028] This example discloses a system for purifying and treating ammonia wastewater. Figure 1 , Figure 2 The ammonia vapor wastewater purification treatment system includes a reagent dilution tank 1, a reagent dosing pump 2, a reaction tank 3 with a stirrer 31, a sedimentation tank 5, a first booster pump 6, at least one non-compression fiber ball filter 7, and a second booster pump 8 which are connected in sequence.

[0029] After the ammonia vapor wastewater to be treated is introduced into the reaction tank 3 through the corresponding wastewater delivery pipeline, the reagent delivery mechanism, i.e., the reagent dilution tank 1 and the reagent dosing pump 2, delivers the corresponding ammonia nitrogen remover into the reaction tank 3 in proportion for chemical reaction (neutralization, complexation, chemical precipitation, etc.). In this example, in order to achieve the purification treatment of the ammonia vapor wastewater, it is necessary to add a certain amount of ammonia nitrogen remover to the wastewater to purify the water quality of the ammonia vapor wastewater through certain chemical reactions. The ammonia nitrogen remover can adopt commercially available acid neutralization or complexation preparations, for example, the commercially available LZ-1 purification liquid (Henan Yaerwo Fertilizer Co., Ltd.) or other similar purifiers. The ammonia nitrogen remover is delivered into the reaction tank 3 via the reagent delivery mechanism. For details, see Figure 1 , Figure 2 The reagent delivery mechanism includes a reagent dilution tank 1 and a reagent dosing pump 2 that are connected to the corresponding pipes. The reagent dilution tank 1 is a dilution container for the original reagent. The outlet of the reagent dilution tank 1 is connected to the inlet of the reagent dosing pump 2 through a pipeline. By adjusting the operating parameters of the reagent dosing pump 2, the quantitative and uniform pumping of the reagent is achieved. The outlet of the reagent dosing pump 2 is connected to the reaction tank 3 through a one-way valve and a ball valve, which can effectively prevent the ammonia wastewater from flowing back into the reagent delivery mechanism when the liquid level in the reaction tank 3 is too high, and the one-way delivery of the reagent is achieved. After being diluted by the reagent dilution tank 1, the ammonia nitrogen remover is delivered to the reaction tank 3 through a delivery pipeline under the action of the reagent dosing pump 2, and reacts with the ammonia wastewater in a certain proportion.

[0030] The ammonia wastewater and the ammonia nitrogen remover undergo a neutralization reaction in the reaction tank 3 to achieve preliminary purification of the ammonia wastewater. In order to accelerate the reaction rate and improve the purification efficiency, in this embodiment, see Figure 1 , Figure 2 A stirrer 31 is provided in the reaction tank 3 to accelerate the flow of water in the reaction tank through stirring, thereby accelerating the reaction rate of the evaporated ammonia wastewater and the ammonia nitrogen remover and improving the purification rate of the evaporated ammonia wastewater.

[0031] After the ammonia wastewater fully reacts with the purification agent, a certain amount of precipitation will be produced, so it is necessary to separate the precipitation from the clarified liquid and treat them separately. Figure 1 , Figure 2, a sedimentation tank 5 is set downstream of the reaction tank 3, and a radial flow sedimentation tank is used in this example. The ammonia wastewater that has reacted with the ammonia nitrogen remover is introduced into the sedimentation tank 5 through the overflow port 4 between the reaction tank 3 and the sedimentation tank 5 for sedimentation. In order to avoid excessive sludge precipitation in the sedimentation tank 5 and affect the purification effect, a scraper 51 and a sludge conveyor 52 are provided in the sedimentation tank 5. The scraper 51 can collect sediment, promote water flow, and improve the sedimentation effect. The sludge conveyor 52 can discharge the sediment from the sedimentation tank 5 in time to prevent sediment accumulation. The two cooperate to ensure the stable and reliable operation of the sedimentation tank 5. In addition, in this embodiment, the reaction tank 3 and the sedimentation tank 5 are respectively provided with liquid level gauges to prevent water overflow caused by excessive water inflow.

[0032] The purified wastewater obtained after sedimentation in sedimentation tank 5 still contains a small amount of impurities and has not yet reached the discharge standard. However, considering that it takes a long time to set up a secondary sedimentation for impurity precipitation, it is not conducive to improving the purification efficiency of ammonia wastewater. Therefore, see Figure 1 , Figure 2 In this embodiment, a non-compression fiber ball filter 7 is provided (the non-compression fiber ball filter 7 is purchased from Zhengzhou Rongmao Water Purification Material Co., Ltd., is a steel circular tank, adopts pressure filtration, and uses fiber balls as filter materials) to filter impurities. The non-compression fiber ball filter 7 is filled with fiber balls attached with an ammonia nitrogen remover (such as optional LZ-1 type purification liquid or other commercially available products). A small amount of impurities contained in the ammonia evaporation wastewater can be removed through the adsorption effect of the fiber balls, thereby achieving efficient purification treatment of the ammonia evaporation wastewater.

[0033] In this embodiment, no less than one non-compression fiber ball filter 7 is provided. In some other embodiments, other numbers, at least one non-compression fiber ball filter 7, are provided. In this embodiment, two non-compression fiber ball filters 7 are arranged in series in two stages to achieve multiple filtration of impurities in ammonia evaporation wastewater, thereby improving the impurity filtration effect and the purification effect of ammonia evaporation wastewater. In addition, in order to improve the purification efficiency of ammonia evaporation wastewater, a first booster pump 6 is provided between the sedimentation tank 5 and the non-compression fiber ball filter 7. In this embodiment, the working parameters of the first booster pump 6 are set to 200-300 rpm. Through the pressurization of the first booster pump, the water pressure entering the non-compression fiber ball filter 7 is increased, thereby accelerating the time for wastewater to pass through the non-compression fiber ball filter 7, thereby accelerating the water filtration efficiency and achieving the filtration of impurities in the water.

[0034] The ammonia wastewater enters the water inlet at the top of the non-compacted fiber ball filter 7 tank under the action of the first booster pump 6, and flows out from the water outlet at the bottom of the non-compacted fiber ball filter 7 tank through the gaps of the fiber balls filled in the non-compacted fiber ball filter 7 under the dual action of water pressure and gravity, thereby filtering out impurities. However, as the working time of the non-compacted fiber ball filter 7 increases, the impurities filtered out of the wastewater will accumulate in the non-compacted fiber ball filter 7, resulting in a decrease in the wastewater flow rate and a decrease in the water inlet pressure. In order to identify the impurity accumulation problem of the non-compacted fiber ball filter 7, in this embodiment, a pressure gauge is provided between the downstream of the first booster pump 6 and the non-compacted fiber ball filter 7 to detect the water inlet pressure of the non-compacted fiber ball filter 7 at any time, and the impurity blockage in the non-compacted fiber ball filter 7 is judged by the pressure value. When the water inlet pressure of the non-compacted fiber ball filter 7 is less than ≤0.15MPa, the impurities are cleaned in time to restore the good filtering effect of the non-compacted fiber ball filter 7.

[0035] In order to clean the non-compression fiber ball filter 7 when the water inlet pressure is too low, in this embodiment, a backwashing pipeline 11 and a flushing and drainage pipeline 9 are provided. Figure 1 , Figure 2 , a second booster pump 8 and a circulating water pool are arranged downstream of the water outlet of the non-compression fiber ball filter 7, and a corresponding backwashing pipeline 11 is arranged between the circulating water pool and the non-compression fiber ball filter 7. When the water inlet pressure of the non-compression fiber ball filter 7 is ≤0.15MPa, the second booster pump 8 is turned on to perform secondary pressurization on the ammonia evaporation wastewater, and the pressurized ammonia evaporation wastewater is transported from the water outlet of the non-compression fiber ball filter 7 to the water inlet of the non-compression fiber ball filter 7 via the backwashing pipeline 11, so as to achieve reverse cleaning of the fiber balls, and the sewage after backwashing is led to the sedimentation tank 5 via the flushing and drainage pipeline 9 of the water inlet of the non-compression fiber ball filter 7. At the same time, a one-way valve is arranged at the outlet of the first booster pump 6 to prevent the sewage with impurities from flowing back to the first booster pump 6 after backwashing.

[0036] In order to further improve the purification efficiency of ammonia wastewater, in this embodiment, a backup pipeline 10 is provided. When the filtering effect of the main filtering line is not good, the non-compression fiber ball filter 7 of the main filtering line needs to be backwashed, but the non-compression fiber ball filter 7 will stop working during backwashing, thereby prolonging the purification treatment time of ammonia wastewater. In order to improve the purification efficiency of ammonia wastewater and shorten the treatment time, a backup pipeline 10 is provided. For details, see Figure 1 , Figure 2 A corresponding spare pipeline 10 with a valve is provided between the water inlet and the water outlet of the non-compression fiber ball filter 7. In this embodiment, when the main filter line is backwashed, it can be switched to the spare pipeline 10 to achieve filtering and regeneration of the ammonia wastewater without stopping the machine.

[0037] In addition, in the actual production process, the number of booster pumps is not limited to the number in the schematic diagram of this specification. As needed, the booster pumps can be used in the actual operation as "one on and one on standby" or "one on and two on standby".

[0038] Example 2

[0039] A coking plant in Puyang has used two sets of ammonia wastewater purification treatment systems described in Example 1 in the first and second phases of the wastewater treatment process, and the purification treatment effect is good after trial operation. Table 1 presents the comparison data of the water quality after treatment by the ammonia wastewater purification treatment system and the water quality before purification. The test water samples were respectively drained in the ammonia wastewater main pipe on March 26, 2024, and the sampling method was draining and discharging sampling. It can be seen from the table that the values ​​of COD, NH3-N, pH value, conductivity, turbidity, and chloride ion indicators in the water treated by the ammonia wastewater purification treatment system have all decreased significantly. The ammonia wastewater treated by the ammonia wastewater purification treatment system can directly enter the circulating water pool, which improves the purification efficiency of ammonia wastewater, shortens the purification treatment time, and saves treatment costs.

[0040] Table 1 Treatment effect of ammonia wastewater purification system

[0041] .

[0042] Although some preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present application.

[0043] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the inventive concept. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A system for purifying and treating ammonia evaporation wastewater, characterized in that: It includes a reagent dispensing mechanism, a reaction tank with a stirrer, at least one level sedimentation tank, at least one level non-compacted fiber ball filter, and a circulating water tank which are connected in sequence; the reagent dispensing mechanism includes a reagent dilution tank and a pressure pump / metering pump which are connected in sequence; after the ammonia vapor wastewater to be treated is introduced into the reaction tank through the corresponding wastewater conveying pipeline, the reagent dispensing mechanism distributes the corresponding ammonia nitrogen remover into the reaction tank in proportion for chemical reaction, and then the wastewater is treated in at least one level sedimentation tank and at least one level non-compacted fiber ball filter in sequence before being introduced into the circulating water tank; a corresponding flushing and drainage pipeline is provided between the non-compacted fiber ball filter and the sedimentation tank to complete the flushing of the sedimentation tank.

2. The ammonia evaporation wastewater purification treatment system according to claim 1, characterized in that: The sedimentation tank is a radial flow sedimentation tank.

3. The ammonia evaporation wastewater purification treatment system according to claim 1, characterized in that: Corresponding scrapers and sludge conveyors are installed in the sedimentation tank.

4. The ammonia evaporation wastewater purification treatment system according to claim 1, characterized in that: A first pressure pump is installed in the delivery pipeline between the sedimentation tank and the non-compression fiber ball filter; and a second pressure pump is installed in the delivery pipeline between the non-compression fiber ball filter and the circulating water tank.

5. The ammonia evaporation wastewater purification treatment system according to claim 1, characterized in that: Ammonia nitrogen remover is attached to the fiber balls filled in the non-compression fiber ball filter.

6. The ammonia evaporation wastewater purification treatment system according to claim 1, characterized in that: A corresponding backwash pipeline is provided between the circulating water pool and the non-compression fiber ball filter to realize backwashing of the non-compression fiber ball filter.

7. The ammonia evaporation wastewater purification treatment system according to claim 1, characterized in that: A corresponding standby pipeline with a valve is provided between the water inlet and the water outlet of the non-compression fiber ball filter.

8. The ammonia evaporation wastewater purification treatment system according to claim 1, characterized in that: A sampling port is provided at the water outlet of the non-compression fiber ball filter.

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