Biochemical water inlet deamination pretreatment device

Abstract

The utility model relates to a biochemical water inlet ammonia removal pretreatment device, including storage tank, blow -off tower, ammonia absorption tower, fan and circulating pump, the storage tank is used to accommodate the secondary condensate water of wastewater evaporation concentration generation, the upper portion of blow -off tower has first water inlet and first gas outlet, and the bottom of blow -off tower is provided with first air inlet and first drain outlet, the storage tank is connected with first water inlet through pipeline to pump the secondary condensate water into blow -off tower, the fan is connected with first air inlet to blow air into blow -off tower, and the ammonia gas in secondary condensate water is blown off by air, and the secondary condensate water without ammonia gas is discharged from first drain outlet, and the air containing ammonia gas is discharged from first gas outlet, the water inlet pipe is placed in the upper portion of the water distribution tray, and the pipe body of air inlet pipe is provided with a plurality of gas outlets. The utility model controls the flow velocity of wastewater, makes wastewater form vertical water film after entering the water distribution tray and overflowing downwards, and blows air into the inner side of water film, so that better blow -off effect is formed and power consumption is smaller.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection equipment, and in particular to a biochemical influent ammonia removal pretreatment device. Background Technology

[0002] Ammonia nitrogen is a toxic substance. When water containing ammonia nitrogen is discharged into nature, a portion of it will be converted into nitrite. Nitrite can cause oxygen deficiency in organisms and may react with proteins under low pH conditions to form nitrosamines, a carcinogen. Therefore, industrial wastewater must be treated to meet standards before discharge. Wastewater entering a biological treatment system must meet the system's influent standards, with an NH3-N content of less than or equal to 450 mg / L. The secondary condensate from sodium trichloropyridinol wastewater, after concentration and evaporation, has an NH3-N content of approximately 1400 mg / L, far exceeding the influent standards. High ammonia nitrogen wastewater entering the biological system will impact its processing capacity, causing a decrease in its treatment capacity. Failure to meet discharge standards will affect normal production. This invention effectively removes ammonia nitrogen from the secondary condensate, reducing it to within the influent standards. Simultaneously, the stripped ammonia nitrogen is recovered and processed into ammonium sulfate, which can be sold as an industrial byproduct, achieving a continuous, economical, and environmentally friendly ammonia nitrogen treatment process. Compared to other similar inventions, this method has significant advantages. For example, CN202011593831.6, "A method and system for treating high ammonia nitrogen deodorizing wastewater," uses aeration in an aeration tank after adjusting the pH value of the wastewater to remove ammonia nitrogen, and then uses zeolite to absorb the ammonia gas to remove the ammonia nitrogen from the wastewater, achieving a relatively good deodorization and ammonia removal effect. However, there is still the problem of how to further treat the saturated zeolite portion after absorbing ammonia gas. Another example is CN202020396267.8, "A high-efficiency ammonia nitrogen removal device," which uses a method of increasing the temperature of the wastewater and then using a negative pressure stripping tower, a gas-liquid separation tower, and a tail gas absorption tower to remove ammonia nitrogen from the wastewater and recover the ammonia nitrogen to produce ammonia water. This method has achieved a good ammonia removal effect, but there are still problems such as the waste gas not being able to form a closed internal circulation, and the ammonia water produced not being able to form an internal circulation when the wastewater volume is large.

[0003] Meanwhile, existing technologies enhance the stripping effect by increasing the contact area between the stripping gas and the wastewater, thereby increasing the stripping intensity. However, since the flow directions of the stripping gas and the wastewater are opposite, the wastewater containing less ammonia nitrogen is encountered when the stripping gas contains less ammonia, and the wastewater containing more ammonia nitrogen is encountered when the stripping gas contains more ammonia. Simply increasing the contact area between the stripping gas and the wastewater cannot completely enhance the stripping effect, but it obviously leads to an increase in energy consumption. Summary of the Invention

[0004] The purpose of this utility model is to provide a biochemical influent ammonia removal pretreatment device with low energy consumption, good stripping effect, and the ability to realize internal circulation of stripping gas, which is specifically achieved by the following technical solution: A biochemical influent ammonia removal pretreatment device includes a storage tank, a stripping tower, an ammonia absorption tower, a blower, and a circulating pump. The storage tank is used to contain secondary condensate generated from wastewater evaporation and concentration. The stripping tower has a first water inlet and a first air outlet at its upper part, and a first air inlet and a first drain outlet at its bottom. The storage tank is connected to the first water inlet via a pipeline to pump the secondary condensate into the stripping tower. The blower is connected to the first air inlet to blow air into the stripping tower. Ammonia in the secondary condensate is stripped by the air. The ammonia-free secondary condensate is discharged from the first drain outlet, and the ammonia-containing air is discharged from the first air outlet. The ammonia absorption tower has a storage tank at its bottom to contain dilute sulfuric acid and a filling tank at its upper part. The ammonia absorption tower is equipped with a filter media and a spray head located above the filter media. The circulating pump connects the storage tank and the spray head. The first air outlet is connected to the lower part of the ammonia absorption tower via a pipeline. Ammonia-containing air enters the ammonia absorption tower and is sprayed to remove ammonia. The blower is connected to the upper part of the ammonia absorption tower and blows the ammonia-removed air into the stripping tower. The stripping tower contains an air inlet pipe, a water inlet pipe, and several water distribution plates. The air inlet pipe is vertically inserted into the stripping tower from the center of the bottom. The water distribution plates are open containers at the top and are spaced longitudinally on the air inlet pipe. The diameter of the water distribution plates gradually increases from top to bottom. The water inlet pipe is located above the water distribution plates. The air inlet pipe has several air outlets.

[0005] The aforementioned biochemical influent ammonia removal pretreatment device is further designed such that, in two adjacent water distribution plates, the lower water distribution plate is provided with several protrusions that are opposite to the edge of the upper water distribution plate.

[0006] The aforementioned biochemical influent ammonia removal pretreatment device is further designed such that a pipeline mixer and a heat exchanger are connected in series between the storage tank and the stripping tower; the pipeline mixer is connected to a dosing pump for adding alkali solution to the secondary condensate entering the stripping tower; and the heat exchanger is used to raise the temperature of the secondary condensate to 55-60℃.

[0007] The beneficial effects of this utility model are as follows: By controlling the flow rate of wastewater, the wastewater overflows downwards after entering the water distribution plate, forming a vertical water film. Air is blown into the inside of the water film, resulting in a better blowing effect with low power consumption. By increasing the length of the air inlet pipe, the spacing between the water distribution plates is increased, which can significantly increase the contact effect between air and water film with low wind resistance. Furthermore, the high drop allows the water film to splash and generate water mist when it falls into the next water distribution plate, further increasing the contact between air and wastewater and the blowing effect. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0009] Figure 2 This is a schematic diagram of the internal structure of the stripping tower of this utility model.

[0010] Figure 3 This is the runtime data table for the implementation example. Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments: like Figure 1 The illustrated biochemical influent ammonia removal pretreatment device includes a storage tank 3, a stripping tower 1, an ammonia absorption tower 2, a blower 9, and a circulating pump 10. The storage tank 3 is used to contain secondary condensate generated from wastewater evaporation and concentration. The stripping tower 1 has a first inlet and a first outlet at its upper part, and a first air inlet and a first drain outlet at its bottom. The storage tank is connected to the first inlet via a pipeline to pump the secondary condensate into the stripping tower. The blower is connected to the first air inlet to blow air into the stripping tower, where ammonia in the secondary condensate is stripped by the air. The ammonia-free secondary condensate is discharged from the first drain outlet, and the ammonia-containing air is discharged from the first outlet. The bottom 3 of the ammonia absorption tower has a storage tank for dilute sulfuric acid, and the upper part has a filling tank. The ammonia absorption tower is equipped with a filter media and a spray head located above the filter media. The circulating pump is connected to the storage tank and the spray head. The first air outlet is connected to the lower part of the ammonia absorption tower through a pipeline. Ammonia-containing air enters the ammonia absorption tower and is sprayed to remove ammonia. The blower is connected to the upper part of the ammonia absorption tower and blows the air that has been de-ammonia removed into the stripping tower. The stripping tower 1 is equipped with an air inlet pipe 11, a water inlet pipe 12, and several water distribution plates 13. The air inlet pipe is vertically inserted into the stripping tower from the center of the bottom. The water distribution plates 13 are open containers at the top and are arranged longitudinally at intervals on the air inlet pipe. The diameter of the water distribution plates 13 gradually increases from top to bottom. The water inlet pipe is located above the water distribution plates. The air inlet pipe is provided with several air outlets 14.

[0012] To reduce wastewater treatment volume, the wastewater is first evaporated and condensed. Ammonia and some water in the wastewater evaporate to form secondary condensate, which enters the stripping tower and falls into the top water distribution pan 13. When the water distribution pan is full, it overflows from the edge, forming a water film. This ensures a water film forms below each water distribution pan. Air enters the inner side of the water film through the air outlet 14 of the air inlet pipe and is pressurized before being blown outwards, thus stripping the ammonia from the water film. In particular, increasing the vertical height of the stripping tower and the air inlet pipe increases the distance between adjacent water distribution pans, causing the water film to splash as it falls from one pan to another, further enhancing the stripping effect. The ammonia-containing waste gas discharged from the stripping tower enters the ammonia absorption tower, where it is sprayed with dilute sulfuric acid to obtain a certain concentration of ammonium sulfate. The waste gas, now free of ammonia from the spray, is then blown back into the stripping tower by a fan, achieving closed-loop air utilization.

[0013] When the ammonium sulfate concentration in the ammonia absorption tower reaches a certain level, the spray heads in the ammonia absorption tower are turned off, and the ammonium sulfate solution is pumped into the ammonium sulfate storage tank 5.

[0014] In two adjacent water distribution plates, the lower water distribution plate is provided with several protrusions 15 that are opposite to the edge of the upper water distribution plate. These protrusions are higher than the liquid surface of the water distribution plate, which is conducive to collision with the water film to form water mist, thus improving the stripping effect.

[0015] If the pH value of the secondary condensate is low, ammonia nitrogen is difficult to strip, so alkali water needs to be added to adjust the pH value to above 11.5. Therefore, a pipeline mixer 6 is connected in series between the storage tank and the stripping tower. The pipeline mixer 6 is connected to a dosing pump 8 and an alkali storage tank 4 connected to the dosing pump 8, which is used to add alkali water to the secondary condensate entering the stripping tower. At the same time, if the temperature of the secondary condensate is low, it is not easy to achieve the stripping effect, so a heat exchanger 7 is also connected in series. The heat exchanger is used to raise the temperature of the secondary condensate to 55-60℃.

[0016] Example of the running data table is as follows Figure 3 As shown.

Claims

1. A pretreatment device for ammonia removal from biochemical influent, characterized in that, The system includes a storage tank, a stripping tower, an ammonia absorption tower, a blower, and a circulating pump. The storage tank is used to contain secondary condensate produced by wastewater evaporation and concentration. The stripping tower has a first water inlet and a first air outlet at its upper part, and a first air inlet and a first drain outlet at its bottom. The storage tank is connected to the first water inlet via a pipeline to pump the secondary condensate into the stripping tower. The blower is connected to the first air inlet to blow air into the stripping tower, where ammonia in the secondary condensate is stripped by the air. The ammonia-free secondary condensate is discharged from the first drain outlet, and the ammonia-containing air is discharged from the first air outlet. The ammonia absorption tower has a storage tank at its bottom to contain dilute sulfuric acid, and packing material and a container above the packing material at its upper part. The system includes a spray head, a circulating pump connected to the storage tank, and a first air outlet connected to the lower part of the ammonia absorption tower via a pipeline. Ammonia-containing air enters the ammonia absorption tower and is sprayed to remove ammonia. A blower connected to the upper part of the ammonia absorption tower blows the ammonia-removed air into the stripping tower. The stripping tower is characterized by having an air inlet pipe, a water inlet pipe, and several water distribution plates. The air inlet pipe is vertically inserted into the stripping tower from the center of its bottom. The water distribution plates are open containers at the top and are spaced longitudinally on the air inlet pipe, with their diameter gradually increasing from top to bottom. The water inlet pipe is positioned above the water distribution plates. The air inlet pipe has several air outlets.

2. The ammonia removal pretreatment device for biochemical influent according to claim 1, characterized in that, In two adjacent water distribution plates, the lower water distribution plate has several protrusions that are opposite to the edge of the upper water distribution plate.

3. The ammonia removal pretreatment device for biochemical influent according to claim 1, characterized in that, A pipeline mixer and a heat exchanger are connected in series between the storage tank and the stripping tower; the pipeline mixer is connected to a dosing pump for adding alkali solution to the secondary condensate entering the stripping tower; the heat exchanger is used to raise the temperature of the secondary condensate to 55-60℃.

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