A high ammonia-nitrogen wastewater treatment device

Abstract

This utility model relates to a high-ammonia nitrogen wastewater treatment device, belonging to the field of wastewater purification technology. It includes: a wastewater tank, a mixing vessel, a heating vessel, a heating coil, a sedimentation tank, and an alkaline substance supply tank. The wastewater tank contains high-ammonia nitrogen wastewater and has a water pump fixed inside. The heating coil is located inside the heating vessel. The discharge port of the alkaline substance supply tank is connected to the filling port of the mixing vessel. The water pump, mixing vessel, heating coil, and sedimentation tank are connected in series. This utility model first introduces the high-ammonia nitrogen wastewater and alkaline substances into the mixing vessel, so that the nitrogen in the high-ammonia nitrogen wastewater mainly exists in the form of free ammonia. Then, the mixture in the mixing vessel is introduced into the heating coil for heating, causing most of the free ammonia in the high-ammonia nitrogen wastewater to quickly overflow, forming ammonia gas. Finally, the catalyst in the catalytic tube converts the ammonia gas into hydrogen and nitrogen gas, which can replenish hydrogen gas in the hydrogen supply pipe, reducing external hydrogen consumption and lowering the energy consumption for treating high-ammonia nitrogen wastewater.

Description

Technical Field

[0001] This utility model relates to the field of wastewater purification technology, and in particular to a high ammonia nitrogen wastewater treatment device. Background Technology

[0002] With the development of industries such as petroleum, chemical, food, and pharmaceutical, and the continuous improvement of people's living standards, the ammonia nitrogen content in urban sewage and landfill leachate has risen sharply. In recent years, with economic development, the indiscriminate discharge of more and more nitrogen-containing pollutants has caused great harm to the environment. Ammonia nitrogen refers to nitrogen in water existing in the form of free ammonia (NH3) and ammonium ions (NH4+), which exist in the following equilibrium: NH3 + H2O = NH4 + OH-. The equilibrium is affected by pH; as the pH increases, the free ammonia in the water increases, and the equilibrium shifts to the right, with a larger proportion of free ammonia. That is, when pH = 7, most of the ammonia nitrogen exists as NH4+, and when the pH rises to 11.5, 98% of the ammonia nitrogen in wastewater exists as free ammonia.

[0003] Currently, there are two main methods for treating high ammonia nitrogen wastewater in China: physicochemical methods and biological denitrification methods. Physicochemical methods are further divided into two types: ① Air stripping: Under alkaline conditions, ammonia nitrogen in the wastewater is converted into ammonia water, existing in the liquid phase. Separation is achieved by utilizing the difference in concentration between the ammonia in the gas phase and the ammonia water in the liquid phase. This method has a removal efficiency of only about 90%, which is poor and far from meeting emission standards. ② Chemical oxidation: This method uses strong oxidants to directly oxidize ammonia nitrogen into nitrogen gas for removal. Breakpoint chlorination (or other oxidants) utilizes the reaction of ammonia in water with chlorine (oxidant) to generate ammonia gas for denitrification. This method has the following main problems: First, new compounds are generated during the reaction, requiring a separate, costly, and complex process to remove them. Second, the amount of oxidant used is large, and the oxidant itself is unstable under the influence of pH, temperature, and concentration. Furthermore, there are difficulties in mixing with wastewater during industrial production, and the generated gas needs to be purged, resulting in unsatisfactory effects and making it difficult to meet emission standards in actual production applications. Secondly, traditional and newly developed biological denitrification processes include A / O, two-stage activated sludge process, strong oxidation-aerobic biological treatment, short-cut nitrification-denitrification, and ultrasonic stripping for ammonia nitrogen removal. Because wastewater contains large amounts of salts such as ammonium chloride and sodium chloride, making it difficult for microorganisms to survive, biological denitrification is not suitable for treating high-ammonia-nitrogen wastewater.

[0004] Therefore, how to design a high ammonia nitrogen wastewater treatment device that is simple in structure, low in cost, has good nitrogen removal effect, and low nitrogen removal energy consumption is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] This invention provides a high ammonia nitrogen wastewater treatment device, which solves the technical problems of existing high ammonia nitrogen wastewater treatment devices having complex structures, high costs, poor nitrogen removal effects, and high energy consumption.

[0006] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a high ammonia nitrogen wastewater treatment device, comprising: a wastewater tank, a mixing vessel, a heating vessel, a heating coil, a sedimentation tank, and an alkaline substance supply tank.

[0007] The wastewater tank contains high-ammonia-nitrogen wastewater and has a water pump fixed inside. The mixing vessel is located on one side of the wastewater tank, and its inlet is connected to the pump outlet of the water pump. The heating vessel is located on one side of the mixing vessel, and a burner is fixed at its bottom. It has a smoke outlet at its top, and a hydrogen supply pipe and an air supply pipe connected to the burner are inserted into its lower side wall. The heating coil is fixed inside the heating vessel, and one end of it extends out of the heating vessel and is connected to the mixing outlet of the mixing vessel. The sedimentation tank is located on one side of the heating vessel, and its top vent is connected to the hydrogen supply pipe through a gas pipe and an exhaust fan. Its upper side wall inlet is connected to the other end of the heating coil that extends out of the heating vessel through a catalytic pipe. Its lower side wall outlet is connected to the external drainage system. The discharge port of the alkaline supply tank is connected to the feeding port of the mixing vessel.

[0008] The beneficial effects of this utility model are as follows: A novel high-ammonia nitrogen wastewater treatment device is designed. First, high-ammonia nitrogen wastewater and alkaline substances are introduced into a mixing vessel, so that the nitrogen in the wastewater mainly exists in the form of free ammonia (NH3). Then, the mixture in the mixing vessel is introduced into a heating coil for heating, causing most of the free ammonia in the wastewater to quickly overflow and form ammonia gas. Finally, the catalyst in the catalytic tube converts the ammonia gas into hydrogen and nitrogen gas. Since the vent on the lower side wall of the sedimentation tank is connected to the hydrogen supply pipe through a gas pipe and an exhaust fan, hydrogen can be replenished to the hydrogen supply pipe, reducing the external hydrogen consumption, lowering the energy consumption for high-ammonia nitrogen wastewater treatment, and improving the nitrogen removal efficiency and effect of high-ammonia nitrogen wastewater treatment.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, it also includes a stirring motor and a spiral shaft. The stirring motor is fixed at the top of the mixing vessel and its output shaft extends rotatably into the mixing vessel. The spiral shaft is located inside the mixing vessel and its top is connected to the output shaft of the stirring motor.

[0011] The further beneficial effect of adopting the above is that using a stirring motor to drive the spiral shaft to rotate can improve the mixing effect and mixing efficiency of alkaline substances and high ammonia nitrogen wastewater.

[0012] Furthermore, it also includes a switch door, and the bottom of the sedimentation tank is provided with a sediment outlet; the switch door can be switched on and off at the sediment outlet.

[0013] The further beneficial effect of adopting the above method is that the purified high ammonia nitrogen wastewater is first discharged through the water outlet on the lower side wall of the sedimentation tank, and then the door is opened to recover the alkaline substances after sedimentation.

[0014] Furthermore, the heating coil is spirally arranged along the height direction of the heating vessel.

[0015] The further beneficial effect of adopting the above is that by using heating coils arranged spirally along the height of the heating vessel to heat high ammonia nitrogen wastewater containing alkaline substances, the heat of the flue gas inside the heating vessel can be fully utilized.

[0016] Furthermore, it also includes a pH detector, which is fixed outside the mixing vessel and has its probe extending into the mixing vessel.

[0017] The further beneficial effect of adopting the above method is that by inserting the probe of the pH detector into the mixing vessel, the pH value of the mixture inside the mixing vessel can be detected in real time. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of a high ammonia nitrogen wastewater treatment device according to the present invention;

[0019] Figure 2 This is a schematic diagram of the internal structure of a high ammonia nitrogen wastewater treatment device according to the present invention.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. Wastewater tank; 2. Mixing vessel; 3. Heating vessel; 4. Heating coil; 5. Sedimentation tank; 6. Alkaline substance supply tank; 7. Water pump; 8. Hydrogen supply pipe; 9. Air supply pipe; 10. Stirring motor; 11. Spiral shaft; 12. Opening and closing door. Detailed Implementation

[0022] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0023] like Figure 1 and Figure 2 As shown, a high-ammonia nitrogen wastewater treatment device includes: a wastewater tank 1, a mixing vessel 2, a heating vessel 3, a heating coil 4, a sedimentation tank 5, and an alkaline substance supply tank 6.

[0024] Wastewater tank 1 contains high-ammonia nitrogen wastewater and a water pump 7 is fixed inside it; mixing vessel 2 is located on one side of wastewater tank 1 and its inlet is connected to the pump outlet of water pump 7; heating vessel 3 is located on one side of mixing vessel 2 and a burner is fixed at its bottom, with a smoke outlet at its top, and a hydrogen supply pipe 8 and an air supply pipe 9 connected to the burner are inserted into its lower side wall; heating coil 4 is fixed inside heating vessel 3 and one end of it extends out of heating vessel 3 and is connected to the mixing outlet of mixing vessel 2; sedimentation tank 5 is located on one side of heating vessel 3 and its top air outlet is connected to hydrogen supply pipe 8 through a gas pipe and a blower, its upper side wall water inlet is connected to the other end of heating coil 4 through a catalytic pipe, and its lower side wall water outlet is connected to the external drainage system; the discharge port of alkaline supply tank 6 is connected to the feeding port of mixing vessel 2.

[0025] like Figure 2 As shown, in some specific embodiments, it may also include a stirring motor 10 and a spiral shaft 11. The stirring motor 10 is fixed at the top of the mixing vessel 2 and its output shaft rotates into the mixing vessel 2; the spiral shaft 11 is located inside the mixing vessel 2 and its top is connected to the output shaft of the stirring motor 10.

[0026] like Figure 1 and Figure 2 As shown, in some specific embodiments, a switch door 12 may also be included, and the bottom end of the sedimentation tank 5 is provided with a sediment outlet; the switch door 12 can be switched on and off at the sediment outlet.

[0027] In some specific embodiments, the heating coil 4 is spirally arranged along the height direction of the heating vessel 3.

[0028] In some specific embodiments, a pH detector is also included, which is fixed outside the mixing vessel 2 and its probe extends into the mixing vessel 2.

[0029] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A high-ammonia nitrogen wastewater treatment device, characterized in that, include: Wastewater tank (1), mixing vessel (2), heating vessel (3), heating coil (4), sedimentation tank (5), and alkaline supply tank (6), The wastewater tank (1) contains high ammonia nitrogen wastewater and a water pump (7) is fixed inside it; the mixing vessel (2) is located on one side of the wastewater tank (1) and its inlet is connected to the pump outlet of the water pump (7); the heating vessel (3) is located on one side of the mixing vessel (2) and a burner is fixed at its bottom, with a smoke outlet at its top, and a hydrogen supply pipe (8) and an air supply pipe (9) connected to the burner are inserted into its lower side wall; the heating coil (4) is fixed inside the heating vessel (3) and its One end of the heating vessel (3) extends out and is connected to the mixing outlet of the mixing vessel (2); the sedimentation tank (5) is located on one side of the heating vessel (3) and its top gas outlet is connected to the hydrogen supply pipe (8) through a gas pipe and a blower; the water inlet of its upper side wall is connected to the heating coil (4) through a catalytic pipe and extends out of the other end of the heating vessel (3); the water outlet of its lower side wall is connected to the external drainage system; the discharge port of the alkaline substance supply tank (6) is connected to the feeding port of the mixing vessel (2).

2. The high ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, It also includes a stirring motor (10) and a spiral shaft (11). The stirring motor (10) is fixed at the top of the mixing vessel (2) and its output shaft rotates into the mixing vessel (2). The spiral shaft (11) is located inside the mixing vessel (2) and its top is connected to the output shaft of the stirring motor (10) for transmission.

3. The high ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, It also includes a switch door (12), and the bottom of the sedimentation tank (5) is provided with a sediment outlet; the switch door (12) can be switched on and off at the sediment outlet.

4. The high ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, The heating coil (4) is spirally arranged along the height direction of the heating vessel (3).

5. The high ammonia nitrogen wastewater treatment device according to claim 1, characterized in that, It also includes a pH detector, which is fixed outside the mixing vessel (2) and its probe extends into the mixing vessel (2).

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