Wastewater treatment system suitable for denitration catalyst activation

Abstract

The utility model relates to a wastewater treatment system suitable for denitration catalyst activation, which comprises a plurality of lifting pumps, a plurality of liquid medicine storage tanks, a first treatment unit and a second treatment unit, a first collecting tank, a first neutralizing tank, a first coagulating tank, a first flocculating tank, a first settling tank, a first regulating tank and a first electrolytic tank are sequentially arranged at the process section of the first treatment unit; a second collection tank, a second neutralization tank, a second coagulation tank, a second flocculation tank, a second sedimentation tank, a second electrolytic tank and a clean water tank are sequentially arranged at the process section of the second treatment unit; a water treatment agent at each liquid medicine storage tank is respectively added into the first neutralization tank, the first coagulation tank, the second neutralization tank and the second coagulation tank through guide pipes. The wastewater treatment system suitable for denitration catalyst activation has the beneficial effects of high pollutant index removal rate and obvious water treatment agent effect.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to a wastewater treatment system suitable for activating a denitration catalyst. Background Art

[0002] The flue gas produced by the combustion of coal-fired boilers contains a large amount of nitrogen oxides (NOx). If the flue gas is discharged directly into the atmosphere without any treatment, it will cause serious pollution to the atmosphere. In order to reduce the emission of nitrogen oxides in the flue gas, catalytic methods are generally used to treat the flue gas to remove the harm of nitrogen oxides to the environment.

[0003] SCR denitration catalyst is one of the main catalysts used in the industry. With the long-term use of SCR denitration catalyst, the catalyst will be physically and chemically deactivated. Therefore, it is often accompanied by activation of SCR denitration catalyst. However, during the activation process, a large amount of wastewater will be generated. If it is discharged directly at will, it will inevitably cause great harm to the environment. The wastewater generated during the activation process has complex components, and the indicators and characteristics of wastewater pollutants generated at each stage are quite different. In the existing technology, the treatment method of traditional coagulation and precipitation will reduce the effect of water treatment agents and the treatment effect is not good. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a wastewater treatment system suitable for denitration catalyst activation, which has high pollutant index removal rate and obvious water treatment agent effect.

[0005] The technical solution of the utility model is:

[0006] A wastewater treatment system suitable for denitration catalyst activation, comprising a plurality of lifting pumps and a plurality of liquid medicine storage tanks, and also comprising a first treatment unit and a second treatment unit, wherein a first collection tank, a first neutralization tank, a first coagulation tank, a first flocculation tank, a first sedimentation tank, a first regulating tank and a first electrolytic tank are sequentially arranged at the process section of the first treatment unit, and a lifting pump is arranged between each tank body;

[0007] The process section of the second treatment unit is provided with a second collecting tank, a second neutralization tank, a second coagulation tank, a second flocculation tank, a second sedimentation tank, a second electrolytic tank and a clear water tank in sequence, and each tank is provided with a lifting pump;

[0008] The effluent from the first electrolytic cell at the first treatment unit flows into the second collecting cell at the second treatment unit;

[0009] The water treatment agents at each of the drug liquid storage tanks are respectively added into the first neutralization tank, the first coagulation tank, the second neutralization tank, and the second coagulation tank through a catheter.

[0010] Preferably, the water treatment agent in each of the liquid medicine storage tanks is mixed with the water body by adding through pipelines.

[0011] Preferably, stirring teeth are provided at both the first neutralization tank and the second neutralization tank.

[0012] Preferably, grids are provided at the first flocculation tank and the second flocculation tank, and staggered pores are provided at the grids along the water flow direction.

[0013] Preferably, the bottoms of the first sedimentation tank and the second sedimentation tank are arranged in the form of inclined plates, and the bottom surface on the outlet side is higher than the bottom surface on the inlet side.

[0014] Preferably, the bottoms of the first sedimentation tank and the second sedimentation tank are arranged in a conical shape, and mud discharge ports are arranged at the bottoms of the first sedimentation tank and the second sedimentation tank.

[0015] Preferably, the tops of the first sedimentation tank and the second sedimentation tank are both provided with conduits, the conduits are used to gather the incoming water from the front-end process section, the outlets of the conduits are provided with conical surfaces, and a plurality of guide grooves are evenly distributed along the apex of the conical surfaces.

[0016] Preferably, the first electrolytic cell and the second electrolytic cell operate in the form of iron-carbon micro-electrolysis.

[0017] Preferably, it also includes a sludge recovery unit, which is used to dispose of the sludge in the first sedimentation tank and the second sedimentation tank.

[0018] Compared with the prior art, the wastewater treatment system suitable for denitrification catalyst activation of the utility model is provided with two treatment units. In specific use, according to the different characteristics of heavy metal ion index, ammonia nitrogen index, potassium dichromate index and suspended solid index of wastewater pollutants in the denitrification catalyst activation stage, the sewage in each stage is treated in steps to avoid the pollutant components affecting the performance of the water treatment agent. Therefore, it has the beneficial effects of high pollutant index removal rate and obvious water treatment agent effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The utility model is a flow chart of an embodiment of a wastewater treatment system suitable for denitration catalyst activation.

[0020] Figure 2 It is a schematic diagram of an embodiment of the first neutralization tank and the second neutralization tank of the wastewater treatment system suitable for denitration catalyst activation of the utility model.

[0021] Figure 3 It is a schematic diagram of an embodiment of the first flocculation tank and the second flocculation tank of the wastewater treatment system suitable for denitration catalyst activation of the utility model.

[0022] Figure 4 It is a schematic diagram of an optional embodiment of the first sedimentation tank and the second sedimentation tank of the wastewater treatment system suitable for denitration catalyst activation of the utility model.

[0023] Figure 5 It is a schematic diagram of another optional embodiment of the first sedimentation tank and the second sedimentation tank of the wastewater treatment system suitable for denitration catalyst activation of the utility model.

[0024] Description of the numbers in the figure:

[0025] 101-grid; 102-pores; 103-stirring teeth; 104-inclined plate; 105-conical surface; 106-guide groove; 107-stopper. DETAILED DESCRIPTION

[0026] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Embodiment 1:

[0028] The wastewater treatment system provided by the utility model is suitable for the comprehensive wastewater generated during the activation process of the denitrification catalyst. It can be understood that during the activation process, the pollutant index characteristics of the wastewater generated in the acid washing, alkali washing and water washing stages are relatively high heavy metal ion index, ammonia nitrogen index, potassium dichromate index, and suspended solids index. The pollutant index characteristics of the wastewater in the activation stage are that the metal ion index, ammonia nitrogen index, potassium dichromate index, and suspended solids index are significantly lower than those in the acid washing, alkali washing, and water washing stages. However, the wastewater output in the activation stage is significantly higher than that in the acid washing, alkali washing, and water washing stages.

[0029] like Figure 1 In the illustrated embodiment, each liquid storage tank is used to store water treatment agents such as coagulant polyaluminium chloride, neutralizer hydrochloric acid, neutralizer sodium hydroxide, polyacrylamide, ammonia nitrogen remover, etc. Each lifting pump is used to transfer wastewater at each process section or add water treatment agents into a designated tank body.

[0030] The wastewater treatment system is provided with two treatment units, specifically, including a first treatment unit and a second treatment unit. The first treatment unit is used to treat wastewater generated in the acid washing, alkali washing and water washing stages. The first collection tank provided at the first treatment unit is used to collect wastewater generated in this stage. According to the Ph value and the amount of water inflow of the wastewater generated in this stage, hydrochloric acid or sodium hydroxide is added to the first neutralization tank to make the water in the first neutralization tank alkaline, creating conditions for flocculation and allowing heavy metal ions to precipitate. The first coagulation tank is used to quickly mix the water treatment agents polyaluminum chloride and polyacrylamide with the neutralized wastewater. After the water treatment agents and wastewater are mixed, they are transported to the first flocculation tank via a lifting pump. The first flocculation tank creates conditions for the water treatment agents to realize the bridging and netting mechanism. At the same time, in the first flocculation tank, the water treatment agents are combined with suspended matter. After the wastewater passes through the first flocculation tank, it is transferred to the first sedimentation tank by a lifting pump. The suspended matter and heavy metal ions combined with hydroxide enriched by the water treatment agent in the first sedimentation tank complete gravity sedimentation in the first sedimentation tank, and the content of suspended matter and heavy metal ions in the supernatant are greatly improved. The supernatant in the first sedimentation tank is sent to the first regulating tank by a lifting pump. After the first regulating tank is full, it is transferred to the first electrolytic tank by a lifting pump. After being treated in the first electrolytic tank, the potassium dichromate index is greatly reduced. The water treated in the first electrolytic tank is transferred to the second collection tank of the second treatment unit and treated again by the second treatment unit.

[0031] The second treatment unit is used to treat the wastewater generated in the activation stage. The second collection tank set at the second treatment unit is used to collect the wastewater generated in this stage and treated by the first treatment unit. Hydrochloric acid or sodium hydroxide is added to the second neutralization tank according to the pH value and water volume of the wastewater generated in this stage to make the water in the second neutralization tank alkaline, creating conditions for flocculation. The second coagulation tank is used to quickly mix the water treatment agents polyaluminum chloride, polyacrylamide, ammonia nitrogen remover and the neutralized wastewater. After the water treatment agents and wastewater are mixed, they are transferred to the second flocculation tank through the lifting pump. The second flocculation tank creates conditions for the water treatment agents to realize the bridging and netting mechanism. At the same time, in the second flocculation tank, the water treatment agents are combined with suspended matter, and the ammonia nitrogen remover is combined with ammonia nitrogen. After the wastewater passes through the second flocculation tank, it is transferred to the second sedimentation tank by a lifting pump. The suspended matter enriched by the water treatment agent in the second sedimentation tank and the product of the reaction of the ammonia nitrogen remover complete gravity sedimentation in the second sedimentation tank. The suspended matter and ammonia nitrogen content in the supernatant are greatly improved. The supernatant in the second sedimentation tank is sent to the second electrolytic tank by a lifting pump. After treatment in the second electrolytic tank, the potassium dichromate index is greatly reduced. The water treated in the second electrolytic tank is sent to the clear water tank. After being tested to meet the sewage discharge standards, it is discharged to the environment.

[0032] Among them, the first collection tank and the second collection tank have the same structure, the first neutralization tank and the second neutralization tank have the same structure, the first coagulation tank and the second coagulation tank have the same structure, the first flocculation tank and the second flocculation tank have the same structure, the first sedimentation tank and the second sedimentation tank have the same structure, the first electrolytic cell and the second electrolytic cell have the same structure, and each tank body can be in the form of a ground structure or in the form of stainless steel welding.

[0033] The first electrolytic cell and the second electrolytic cell can adopt the working form of iron-carbon micro-electrolysis, which has the advantages of mature technology and low processing cost.

[0034] Embodiment 2:

[0035] Based on Example 1, the water treatment reagents of the first treatment unit and the second treatment unit in the coagulation stage can be mixed with the water body by adding through pipelines. This mixing method has the advantages of uniform and rapid mixing.

[0036] Embodiment 3:

[0037] On the basis of Example 1 or 2, Figure 2 In the illustrated embodiment, in order to ensure the mixing effect of the hydrochloric acid or sodium hydroxide and the water added to the first neutralization tank and the second neutralization tank when adjusting the pH value, stirring teeth 103 are provided at the first neutralization tank and the second neutralization tank.

[0038] Embodiment 4:

[0039] On the basis of any one of embodiments 1-3, Figure 3 In the illustrated embodiment, in order to ensure the combination of suspended matter and water treatment chemicals and improve the treatment effect of water treatment chemicals, the first flocculation tank and the second flocculation tank are provided with a grid 101, and along the water flow direction, the grid 101 is provided with staggered pores 102. In the bridging and netting stage of the water treatment chemicals, the flow velocity of the water body is decelerated under the action of the grid 101, and when the water body flows into the grid 101, it flows out from the pores 102 at the grid 101. The staggered arrangement of the pores 102 changes the direction of the water flow, which is conducive to the formation of alum flowers.

[0040] Embodiment 5:

[0041] On the basis of any one of embodiments 1-4, Figure 4 In the illustrated implementation, an optional form of a first sedimentation tank and a second sedimentation tank is provided. To ensure the effect of gravity sedimentation, when the first sedimentation tank and the second sedimentation tank are shorter, the bottom of the first sedimentation tank and the second sedimentation tank are arranged in the form of an inclined plate 104, and the bottom surface of the outlet side is higher than the bottom surface of the inlet side.

[0042] Embodiment 6:

[0043] On the basis of Examples 1-4, Figure 5 In the embodiment shown, another optional form of the first sedimentation tank and the second sedimentation tank is provided, wherein the bottoms of the first sedimentation tank and the second sedimentation tank are arranged in a conical shape, and the bottoms of the first sedimentation tank and the second sedimentation tank are both provided with a mud discharge port. After sedimentation, the suspended matter is enriched at the bottom of the tank body and discharged from the mud discharge port.

[0044] In this embodiment, when the first sedimentation tank and the second sedimentation tank receive water from the front-end process section, in order to prevent the sediments settled at the bottom from being disturbed, a conduit is provided at the top of each of the first sedimentation tank and the second sedimentation tank. The conduit is used to gather the water from the front-end process section. A conical surface 105 is provided at the outlet of the conduit, and a plurality of guide grooves 106 are evenly distributed along the apex of the conical surface 105. Among them, a block 107 is provided at the inner wall of the first sedimentation tank and the second sedimentation tank, and the conical surface 105 is suspended inside the tank body through the block 107. Specifically, when in use, the water from the front-end process section is collected through the conduit, and the water flow generated by the conduit flows to the top of the conical surface 105, and is guided by a plurality of guide grooves 106 provided on the upper part of the conical surface 105, flows to the edge of the conical surface 105, and falls into the tank body through the edge, thereby preventing the suspended matter enriched at the bottom from being stirred.

[0045] Embodiment 7:

[0046] On the basis of any one of embodiments 1-6, a sludge recovery unit is added in this embodiment, and the sludge generated in the first sedimentation tank and the second sedimentation tank is recovered by the sludge recovery unit and then transported out to a third-party disposal unit for disposal.

[0047] The embodiments described above are only preferred specific implementation methods of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present utility model according to the technical solution and utility model concept of the present utility model, which should be covered by the protection scope of the present utility model.

Claims

1. A wastewater treatment system suitable for denitration catalyst activation, comprising a plurality of lift pumps and a plurality of liquid storage tanks, characterized in that: It also includes a first treatment unit and a second treatment unit, wherein the process section of the first treatment unit is sequentially provided with a first collection tank, a first neutralization tank, a first coagulation tank, a first flocculation tank, a first sedimentation tank, a first regulating tank and a first electrolytic tank, and a lifting pump is provided between each tank body; The process section of the second treatment unit is provided with a second collecting tank, a second neutralization tank, a second coagulation tank, a second flocculation tank, a second sedimentation tank, a second electrolytic tank and a clear water tank in sequence, and each tank is provided with a lifting pump; The effluent from the first electrolytic cell at the first treatment unit flows into the second collecting cell at the second treatment unit; The water treatment agent at each of the liquid medicine storage tanks is respectively added into the first neutralization tank, the first coagulation tank, the second neutralization tank, and the second coagulation tank through a catheter.

2. The wastewater treatment system suitable for denitration catalyst activation according to claim 1, characterized in that: The water treatment agents at each of the liquid medicine storage tanks are mixed with the water body by adding through pipelines.

3. The wastewater treatment system suitable for denitration catalyst activation according to claim 1, characterized in that: The first neutralization tank and the second neutralization tank are both provided with stirring teeth (103).

4. The wastewater treatment system suitable for denitration catalyst activation according to claim 1, characterized in that: The first flocculation tank and the second flocculation tank are provided with grids (101), and the grids (101) along the water flow direction are provided with interlaced pores (102).

5. The wastewater treatment system suitable for denitration catalyst activation according to claim 1, characterized in that: The bottoms of the first sedimentation tank and the second sedimentation tank are arranged in the form of inclined plates (104), and the bottom surface of the water outlet side is higher than the bottom surface of the water inlet side.

6. The wastewater treatment system suitable for denitration catalyst activation according to claim 1, characterized in that: The bottoms of the first sedimentation tank and the second sedimentation tank are arranged in a conical shape, and mud discharge ports are arranged at the bottoms of the first sedimentation tank and the second sedimentation tank.

7. The wastewater treatment system suitable for denitration catalyst activation according to claim 6, characterized in that: The tops of the first sedimentation tank and the second sedimentation tank are both provided with conduits, the conduits being used to gather water from the front-end process section, the outlets of the conduits being provided with conical surfaces (105), and a plurality of guide grooves (106) being evenly distributed along the apex of the conical surfaces (105).

8. The wastewater treatment system suitable for denitration catalyst activation according to claim 1, characterized in that: The working mode of the first electrolytic cell and the second electrolytic cell is iron-carbon micro-electrolysis.

9. The wastewater treatment system suitable for denitration catalyst activation according to claim 1, characterized in that: It also includes a sludge recovery unit, which is used to dispose of sludge in the first sedimentation tank and the second sedimentation tank.

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