An aeration-free biological filter tower sewage treatment device

Abstract

The present invention relates to a sewage treatment device of a non-aerated biological filter tower. The pH value adjustment mechanism enables the acidifying bacteria microbial packing tray to enter below the sewage liquid level, and the alkaline adjustment packing tray is located above the sewage liquid level to ensure that the pH of the sewage is below 4. When the gas output from the gas outlet is detected by the methane concentration tester to have methane output and the methane concentration is T1, it indicates that the sewage enters the methane production stage. The pH value adjustment mechanism enables the acidifying bacteria microbial packing tray to be located above the sewage liquid level, and the alkaline adjustment packing tray is located below the sewage liquid level to adjust the pH value of the sewage to 6.5 - 7.5, and the methane concentration tester detects the methane concentration T2. When T2 ≥ T1, the pH value adjustment mechanism remains unchanged. When T2 < T1, the alkaline adjustment packing tray affects the products in the acidification stage, and the pH value adjustment mechanism enables the acidifying bacteria microbial packing tray to enter below the sewage liquid level again, and the alkaline adjustment packing tray is located above the sewage liquid level to make the pH of the sewage below 4 again.

Description

Technical Field

[0001] The present invention relates to a sewage treatment device, and more particularly to a sewage treatment device of a biological filter tower without aeration. Background Art

[0002] Anaerobic biological treatment technology is a highly efficient sewage treatment method in which organic matter in sewage is decomposed, metabolized and digested by anaerobic bacteria under anaerobic conditions, resulting in a significant reduction in the content of organic matter in sewage and the production of biogas at the same time.

[0003] During anaerobic treatment, organic matter in wastewater is finally converted into methane, carbon dioxide, water, hydrogen sulfide and ammonia, etc. under the combined action of a large number of microorganisms. During this process, the metabolic processes of different microorganisms affect and restrict each other, forming a complex ecosystem.

[0004] The anaerobic degradation process of high molecular organic matter can be divided into four stages: hydrolysis stage, acidification stage, acetic acid production stage and methane production stage.

[0005] In the acidification stage, acidifying bacteria usually need to operate in an environment with a pH value below 4. However, the ideal pH value range for the methane production stage is 6.5 - 7.5 to increase methane production and reduce hydrogen consumption. Therefore, during anaerobic sewage treatment, it is necessary to ensure both the acidic conditions in the acidification stage and the neutral conditions in the methane production stage to ensure the production of methane and hydrogen. Summary of the Invention

[0006] The present invention designs a sewage treatment device of a biological filter tower without aeration, and the technical problem it solves is that the existing sewage treatment device cannot balance the acidic conditions in the acidification stage and the neutral conditions in the methane production stage, resulting in a reduction in methane production and an increase in hydrogen consumption, and leading to uncontrollability of the end products of anaerobic treatment.

[0007] In order to solve the above-mentioned existing technical problems, the present invention adopts the following solutions:

[0008] An aeration-free biological filter tower sewage treatment device, including a biological filter tower with a water inlet, a water outlet and a gas outlet. There is a pH value adjustment mechanism in the biological filter tower that can adjust the pH value of the sewage to adapt to the different pH value requirements of the acidification stage and the methanogenesis stage; the pH value adjustment mechanism makes the acidifying bacteria microbial packing tray enter below the sewage liquid level, and the alkaline adjustment packing tray is located above the sewage liquid level to ensure that the pH of the sewage is below 4; when the gas output from the gas outlet is detected by a methane concentration tester and there is methane output and the methane concentration is T1, it indicates that the sewage enters the methanogenesis stage; the pH value adjustment mechanism makes the acidifying bacteria microbial packing tray located above the sewage liquid level, and the alkaline adjustment packing tray is located below the sewage liquid level to adjust the pH value of the sewage to 6.5 - 7.5, and the methane concentration tester detects the methane concentration T2; when T2 ≥ T1, the pH value adjustment mechanism remains unchanged; when T2 < T1, the alkaline adjustment packing tray affects the products of the acidification stage, and the pH value adjustment mechanism makes the acidifying bacteria microbial packing tray enter below the sewage liquid level again, and the alkaline adjustment packing tray is located above the sewage liquid level to make the pH of the sewage below 4 again.

[0009] Preferably, the pH value adjustment mechanism includes a first vertical movement driving member and a second vertical movement driving member. The first rack of the first vertical movement driving member and the second rack of the second vertical movement driving member are engaged with gear A. The rotation of gear A makes the first vertical movement driving member and the second vertical movement driving member move in opposite directions; the first vertical movement driving member is connected to the acidifying bacteria microbial packing tray, and the second vertical movement driving member is connected to the alkaline adjustment packing tray.

[0010] Preferably, the first vertical movement driving member is also connected to a first microbial packing tray. The first microbial packing tray is located below the acidifying bacteria microbial packing tray and is always located below the sewage liquid level; the first microbial packing tray is used to gather hydrolytic enzyme microorganisms, acidifying bacteria and hydrogen-producing and acetate-producing bacteria.

[0011] Preferably, the second vertical movement driving member is also connected to a second microbial packing tray. The second microbial packing tray is located below the alkaline adjustment packing tray and is always located below the sewage liquid level; the second microbial packing tray is used to gather hydrolytic enzyme microorganisms, acidifying bacteria and hydrogen-producing and acetate-producing bacteria.

[0012] Preferably, above the first vertical movement driving member and the second vertical movement driving member, an upper limit member is used to ensure that both are always engaged with gear A; the upper limit member is provided with two limit holes, and the first vertical movement driving member and the second vertical movement driving member can move in one limit hole respectively.

[0013] Preferably, below the first vertical movement driving member and the second vertical movement driving member, a lower limit member is used to ensure that both are always engaged with gear A; the lower limit member is provided with two limit holes, and the first vertical movement driving member and the second vertical movement driving member can move in one limit hole respectively.

[0014] Preferably, gear A is connected to the transmission rotating shaft. One end of the transmission rotating shaft extends out of the biological filter tower and is connected to transmission gear C. Transmission gear C meshes with drive gear B. The rotor of the servo motor is connected to drive gear B; the rotation of the rotor causes gear A to rotate.

[0015] Preferably, one end of the transmission rotating shaft is installed in the through hole of the biological filter tower through the first bearing. The inner ring of the first bearing is connected to the transmission rotating shaft, and the outer ring of the first bearing is connected to the inner wall of the through hole of the biological filter tower; the other end of the transmission rotating shaft is connected to the inner wall of the biological filter tower through the second bearing. The inner ring of the second bearing is connected to the transmission rotating shaft, and the outer ring of the second bearing is connected to the inner wall of the biological filter tower.

[0016] Preferably, a heater is provided in the biological filter tower to adjust the temperature of the sewage and improve the hydrolysis rate.

[0017] Preferably, a pH value monitoring sensor and a temperature sensor are provided in the biological filter tower.

[0018] The sewage treatment device of the non-aerated biological filter tower has the following beneficial effects:

[0019] (1) By adjusting the acidity and alkalinity of the sewage through the pH value adjustment mechanism, the present invention ensures that sufficient products can be generated under appropriate acidic conditions during the acidification stage, providing sufficient reactants for the subsequent methane production stage. At the same time, the sewage is adjusted to neutral during the methane production stage, increasing the methane production amount and reducing the hydrogen consumption, thereby improving the effective utilization rate of the sewage.

[0020] (2) While adjusting the acidity and alkalinity of the sewage through the pH value adjustment mechanism, the present invention can also lower the first microbial packing disc and the second microbial packing disc to different positions of the sewage, improving the treatment efficiency and achieving multiple benefits with one action. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 : Structural schematic diagram of the sewage treatment device of the non-aerated biological filter tower of the present invention;

[0022] Figure 2 : Figure 1 First structural schematic diagram of the pH value adjustment mechanism in

[0023] Figure 3 : Figure 1 Second structural schematic diagram of the pH value adjustment mechanism in

[0024] Figure 4 : First working state schematic diagram of the sewage treatment device of the non-aerated biological filter tower of the present invention;

[0025] Figure 5 : Second working state schematic diagram of the sewage treatment device of the non-aerated biological filter tower of the present invention;

[0026] Figure 6 : Schematic diagram of the connection of the transmission components of the pH adjustment mechanism of the present invention.

[0027] Explanation of the reference numerals in the drawings:

[0028] 1 - Biological filter tower; 11 - Water inlet; 12 - Water outlet; 13 - Air outlet; 21 - First vertical movement driving member; 211 - First rack; 22 - Second vertical movement driving member; 221 - Second rack; 23 - Gear A; 24 - Upper limit member; 241 - Limit hole; 25 - Transmission rotating shaft; 26 - Lower limit member; 31 - First microbial packing disc; 32 - Second microbial packing disc; 33 - Acidifying bacteria microbial packing disc; 34 - Alkaline adjustment packing disc; 4 - Sewage liquid level; 5 - Servo motor; 51 - Driving gear B; 52 - Transmission gear C; 53 - First bearing; 54 - Second bearing. Detailed implementation manners

[0029] The following combines Figures 1 to 6 , and makes further explanations for the present invention:

[0030] As Figures 1 - 3 shown, the pH adjustment mechanism includes a first vertical movement driving member 21 and a second vertical movement driving member 22. The first rack 211 of the first vertical movement driving member 21 and the second rack 221 of the second vertical movement driving member 22 are engaged with the gear A 23. The rotation of the gear A 23 causes the first vertical movement driving member 21 and the second vertical movement driving member 22 to move in opposite directions; the first vertical movement driving member 21 is connected to the acidifying bacteria microbial packing disc 33, and the second vertical movement driving member 22 is connected to the alkaline adjustment packing disc 34.

[0031] The first vertical movement driving member 21 is also connected to the first microbial packing disc 31. The first microbial packing disc 31 is located below the acidifying bacteria microbial packing disc 33 and is always below the sewage liquid level 4; the first microbial packing disc 31 is used to gather hydrolytic enzyme microorganisms, acidifying bacteria, and hydrogen-producing and acetic acid-producing bacteria. The second vertical movement driving member 22 is also connected to the second microbial packing disc 32. The second microbial packing disc 32 is located below the alkaline adjustment packing disc 34 and is always below the sewage liquid level 4; the second microbial packing disc 32 is used to gather hydrolytic enzyme microorganisms, acidifying bacteria, and hydrogen-producing and acetic acid-producing bacteria.

[0032] Due to their huge relative molecular weights, macromolecular organic substances cannot penetrate the cell membrane and thus cannot be directly utilized by bacteria. They are decomposed into small molecules by extracellular enzymes of bacteria during the hydrolysis stage. For example: cellulose is hydrolyzed by cellulase into cellobiose and glucose, starch is decomposed by amylase into maltose and glucose, and protein is hydrolyzed by protease into short peptides and amino acids, etc. The hydrolysis enzyme microorganisms aggregated on the first microbial packing disk 31 and the second microbial packing disk 32 can assist the sewage to complete the hydrolysis stage. The first microbial packing disk 31 and the second microbial packing disk 32 can move in the vertical direction, so as to move into sewage at different depths, and thus can accelerate the hydrolysis of macromolecular organic substances in the sewage.

[0033] The acidogenic bacteria aggregated on the first microbial packing disk 31 and the second microbial packing disk 32 are the same as those aggregated on the acidogenic bacteria microbial packing disk 33. The main products after acidification are volatile fatty acids, alcohols, lactic acid, carbon dioxide, hydrogen, ammonia, hydrogen sulfide, etc.

[0034] The hydrogen-producing and acetate-producing bacteria aggregated on the first microbial packing disk 31 and the second microbial packing disk 32 further convert the products after acidification into acetic acid, hydrogen, carbonic acid and new cell substances.

[0035] Above the first vertical movement driving member 21 and the second vertical movement driving member 22, the upper limit member 24 ensures that both of them are always engaged with the gear A23; the upper limit member 24 is provided with two limit holes 241, and the first vertical movement driving member 21 and the second vertical movement driving member 22 can move in one limit hole 241 respectively. Below the first vertical movement driving member 21 and the second vertical movement driving member 22, the lower limit member 26 ensures that both of them are always engaged with the gear A23; the lower limit member 26 is provided with two limit holes, and the first vertical movement driving member 21 and the second vertical movement driving member 22 can move in one limit hole respectively.

[0036] As Figures 4 - 5 shown, the working mode of the sewage treatment device of the non-aeration biological filter tower of the present invention is as follows: The biological filter tower 1 is provided with a water inlet 11, a water outlet 12 and an air outlet 13, and a pH value adjusting mechanism is arranged in the biological filter tower 1 to adjust the pH value of the sewage to meet the different pH value requirements of the acidification stage and the methanogenesis stage.

[0037] The pH value adjusting mechanism makes the acidogenic bacteria microbial packing disk 33 enter below the sewage liquid level 4, and the alkaline adjusting packing disk 34 is located above the sewage liquid level 4 to ensure that the pH of the sewage is below 4, as Figure 4 shown. The acidogenic bacteria in the acidogenic bacteria microbial packing disk 33 acidify the small molecule hydrolysis products in the sewage, generating volatile fatty acids, alcohols, lactic acid, carbon dioxide, hydrogen, ammonia, hydrogen sulfide, etc., and at the same time reducing the pH value of the sewage to below 4.

[0038] When the amount of acidification products reaches a certain level, if the sewage maintains a pH value below 4, although methane will be produced, the methane production is limited and a large amount of hydrogen will be consumed. That is, when the gas output from the gas outlet 13 is detected by the methane concentration tester to have methane output and the methane concentration is T1, it indicates that the sewage has entered the methane production stage.

[0039] At this time, the pH value adjustment mechanism positions the acidification bacteria microbial packing disk 33 above the sewage liquid level 4, and the alkaline adjustment packing disk 34 below the sewage liquid level 4 to adjust the pH value of the sewage to 6.5 - 7.5. The methane concentration tester detects the methane concentration T2; when T2 ≥ T1, the pH value adjustment mechanism remains stationary; it shows that when the pH of the sewage is between 6.5 - 7.5, the methane produced by the acidification products increases and the hydrogen consumed also decreases.

[0040] When T2 < T1, the alkaline adjustment packing disk 34 affects the products of the acidification stage, that is, the sewage is close to neutral for a long time, and the acidification reaction therein cannot continue or the acidification products become less, and it is necessary to increase the acidification bacteria in the sewage to lower the pH value of the sewage.

[0041] Therefore, the pH value adjustment mechanism makes the acidification bacteria microbial packing disk 33 enter below the sewage liquid level 4 again, and the alkaline adjustment packing disk 34 above the sewage liquid level 4 to make the pH of the sewage below 4 again, as Figure 5 shown. The above two procedures are dynamically adjusted and continue until the sewage treatment is completed.

[0042] As Figure 6 shown, the gear A23 is connected to the transmission rotating shaft 25. One end of the transmission rotating shaft 25 extends out of the biological filter tower 1 and is connected to the transmission gear C52. The transmission gear C52 meshes with the driving gear B51. The rotor of the servo motor 5 is connected to the driving gear B51; the rotation of the rotor makes the gear A23 rotate.

[0043] One end of the transmission rotating shaft 25 is installed in the through hole of the biological filter tower 1 through the first bearing 53. The inner ring of the first bearing 53 is connected to the transmission rotating shaft 25, and the outer ring of the first bearing 53 is connected to the inner wall of the through hole of the biological filter tower 1; the other end of the transmission rotating shaft 25 is connected to the inner wall of the biological filter tower 1 through the second bearing 54. The inner ring of the second bearing 54 is connected to the transmission rotating shaft 25, and the outer ring of the second bearing 54 is connected to the inner wall of the biological filter tower 1.

[0044] The biological filter tower 1 is provided with a heater that can adjust the sewage temperature to improve the hydrolysis speed. The biological filter tower 1 is provided with a pH value monitoring sensor and a temperature sensor.

[0045] The present invention has been described exemplarily in conjunction with the accompanying drawings. Obviously, the implementation of the present invention is not limited by the above-mentioned manner. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A sewage treatment device of a biological filter tower without aeration, comprising a biological filter tower (1) provided with a water inlet (11), a water outlet (12) and an air outlet (13), characterized in that: Inside the biological filter tower (1), there is a pH value adjustment mechanism that can adjust the pH value of the sewage to meet the different pH value requirements of the acidification stage and the methanogenesis stage; the pH value adjustment mechanism immerses the acidifying bacteria microbial packing tray (33) below the sewage liquid level (4), and the alkaline adjustment packing tray (34) is located above the sewage liquid level (4) to ensure that the pH of the sewage is below 4; When the gas output from the gas outlet (13) is detected by the methane concentration tester to have methane output and the methane concentration is T1, it indicates that the sewage has entered the methanogenesis stage; the pH value adjustment mechanism positions the acidifying bacteria microbial packing tray (33) above the sewage liquid level (4), and the alkaline adjustment packing tray (34) below the sewage liquid level (4) to adjust the pH value of the sewage to 6.5 - 7.5, and the methane concentration tester detects the methane concentration T2; when T2 ≥ T1, the pH value adjustment mechanism remains stationary; when T2 < T1, the alkaline adjustment packing tray (34) affects the products of the acidification stage, and the pH value adjustment mechanism immerses the acidifying bacteria microbial packing tray (33) below the sewage liquid level (4) again, and the alkaline adjustment packing tray (34) is located above the sewage liquid level (4) to make the pH of the sewage below 4 again; The pH value adjustment mechanism includes a first vertical movement driving member (21) and a second vertical movement driving member (22). The first rack (211) of the first vertical movement driving member (21) and the second rack (221) of the second vertical movement driving member (22) are engaged with gear A (23). The rotation of gear A (23) causes the first vertical movement driving member (21) and the second vertical movement driving member (22) to move in opposite directions; the first vertical movement driving member (21) is connected to the acidifying bacteria microbial packing tray (33), and the second vertical movement driving member (22) is connected to the alkaline adjustment packing tray (34); The first vertical movement driving member (21) is also connected to the first microbial packing tray (31). The first microbial packing tray (31) is located below the acidifying bacteria microbial packing tray (33) and is always below the sewage liquid level (4); the first microbial packing tray (31) is used to gather hydrolytic enzyme microorganisms, acidifying bacteria, and hydrogen-producing and acetate-producing bacteria; The second vertical movement driving member (22) is also connected to the second microbial packing tray (32). The second microbial packing tray (32) is located below the alkaline adjustment packing tray (34) and is always below the sewage liquid level (4); the second microbial packing tray (32) is used to gather hydrolytic enzyme microorganisms, acidifying bacteria, and hydrogen-producing and acetate-producing bacteria.

2. The sewage treatment device of the biological aerated filter without aeration according to claim 1, characterized in that: Above the first vertical movement driving member (21) and the second vertical movement driving member (22), an upper limit member (24) ensures that they are always engaged with gear A (23); the upper limit member (24) is provided with two limit holes (241), and the first vertical movement driving member (21) and the second vertical movement driving member (22) can move in one limit hole (241) respectively.

3. The sewage treatment device of the biological aeration-free filter tower according to claim 2, characterized in that: Below the first vertical movement drive member (21) and the second vertical movement drive member (22), the lower limit member (26) ensures that both are always engaged with the gear A (23); the lower limit member (26) is provided with two limit holes, and the first vertical movement drive member (21) and the second vertical movement drive member (22) can move in one limit hole respectively.

4. The sewage treatment device of the non-aerated biological filter tower according to claim 3, characterized in that: The gear A (23) is connected to the transmission rotating shaft (25). One end of the transmission rotating shaft (25) extends out of the biological filter tower (1) and is connected to the transmission gear C (52). The transmission gear C (52) is engaged with the driving gear B (51). The rotor of the servo motor (5) is connected to the driving gear B (51); The rotation of the rotor causes the gear A (23) to rotate.

5. The sewage treatment device of the non-aerated biological filter tower according to claim 4, characterized in that: One end of the transmission rotating shaft (25) is installed in the through hole of the biological filter tower (1) through the first bearing (53). The inner ring of the first bearing (53) is connected to the transmission rotating shaft (25), and the outer ring of the first bearing (53) is connected to the inner wall of the through hole of the biological filter tower (1); the other end of the transmission rotating shaft (25) is connected to the inner wall of the biological filter tower (1) through the second bearing (54). The inner ring of the second bearing (54) is connected to the transmission rotating shaft (25), and the outer ring of the second bearing (54) is connected to the inner wall of the biological filter tower (1).

6. The sewage treatment device of the biological aerated filter without aeration according to claim 5, characterized in that: A heater is provided in the biological filter tower (1) to adjust the temperature of the sewage and improve the hydrolysis rate.

7. The sewage treatment device of the non-aerated biological filter tower according to claim 6, characterized in that: A pH value monitoring sensor and a temperature sensor are provided in the biological filter tower (1).

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