Water distribution and sludge discharge device for primary sedimentation tank

Abstract

The primary sedimentation tank water distribution and sludge discharge device comprises at least one primary sedimentation tank, the primary sedimentation tank is provided with a primary sedimentation tank water inlet pipe and a primary sedimentation tank water outlet pipe which are connected with the primary sedimentation tank, the primary sedimentation tank water inlet pipe is used for introducing sewage to be treated into the primary sedimentation tank, and the primary sedimentation tank water outlet pipe is used for discharging the treated sewage in the primary sedimentation tank; an outlet of the main water inlet pipe is used for discharging sewage to be treated; an inlet of the water distribution tank is communicated with an outlet of the main water inlet pipe, and an outlet of the water distribution tank is selectively communicated with one of the primary sedimentation tank water inlet pipe and the main water outlet pipe. According to the water distribution and sludge discharge device for the primary sedimentation tank, the sewage to be treated can be introduced into the primary sedimentation tank or the main water outlet pipe according to the COD concentration and the suspended matter concentration of the sewage to be treated, and primary sludge carbon source release and recovery can be realized.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a water distribution and mud discharge device for a primary sedimentation tank. Background Art

[0002] The primary sedimentation tank is an important structure in the pretreatment system of a sewage treatment plant. Its main function is to remove easily precipitated solid particles and suspended matter in sewage through gravity sedimentation, thereby reducing the suspended solids and organic pollutant loads in the subsequent biological treatment process. While removing particulate pollutants in sewage, the primary sedimentation tank also removes a large amount of attached organic carbon sources, resulting in insufficient carbon sources for phosphorus release in the anaerobic zone of the biochemical pool and denitrification and denitrification in the anoxic zone, resulting in a decrease in the efficiency of biological denitrification treatment. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a water distribution and mud discharge device for a primary sedimentation tank.

[0004] The water distribution and mud discharge device of the primary sedimentation tank according to the embodiment of the present invention comprises:

[0005] At least one primary sedimentation tank, the primary sedimentation tank being provided with a primary sedimentation tank water inlet pipe and a primary sedimentation tank water outlet pipe connected thereto, the primary sedimentation tank water inlet pipe being used to introduce the sewage to be treated into the primary sedimentation tank, and the primary sedimentation tank water outlet pipe being used to discharge the treated sewage in the primary sedimentation tank;

[0006] A main water inlet pipe, the outlet of which is used to discharge the sewage to be treated;

[0007] A water distribution tank, the inlet of which is connected to the outlet of the main water inlet pipe, and the outlet of which can be selectively connected to one of the primary sedimentation tank inlet pipe and the main water outlet pipe.

[0008] In some embodiments, the COD concentration of the sewage discharged from the main water inlet pipe is less than or equal to a first preset value, and the suspended particle concentration of the sewage discharged from the main water inlet pipe is less than or equal to a second preset value, and the outlet of the water distribution tank is connected to the main water outlet pipe;

[0009] The COD concentration of the sewage discharged from the main water inlet pipe is greater than the first preset value, and / or the suspended particle concentration of the sewage discharged from the main water inlet pipe is greater than the second preset value, and the outlet of the water distribution tank is connected to the water inlet pipe of the primary sedimentation tank.

[0010] In some embodiments, the primary sedimentation tank is provided with a primary sedimentation tank sludge discharge pipe connected thereto. When the outlet of the water distribution tank is connected to the water inlet pipe of the primary sedimentation tank, the primary sedimentation tank sludge discharge pipe can pass at least part of the sludge in the primary sedimentation tank into the water distribution tank.

[0011] In some embodiments, the primary sedimentation tank water distribution and sludge discharge device includes a regulating tank, the regulating tank includes an inlet tank and the distribution tank, the outlet of the main water inlet pipe, the inlet tank and the distribution tank are connected in sequence, an agitator is provided in the inlet tank, and the primary sedimentation tank sludge discharge pipe can pass the sludge in the primary sedimentation tank into the inlet tank.

[0012] In some embodiments, the regulating tank further comprises a water outlet tank and a water distribution well back chamber;

[0013] The water distribution tank is connected to the rear chamber of the water distribution well through the first overflow hole, and the water inlet pipe of the primary sedimentation tank is connected to the rear chamber of the water distribution well;

[0014] The water distribution tank is connected to the water outlet tank through a second flow hole, and the water outlet tank is connected to the outlet of the primary sedimentation tank outlet pipe and the inlet of the main outlet pipe;

[0015] The regulating tank is provided with a first opening and closing device for opening and closing the first overflow hole, a second opening and closing device for opening and closing the second flow hole, and a third opening and closing device for opening and closing the outlet of the primary sedimentation tank outlet pipe.

[0016] In some embodiments, a sludge pump is provided at the outlet of the sludge discharge pipe of the primary sedimentation tank, the outlet of the sludge pump is connected to the sludge return pipe and the sludge discharge pipe, the outlet of the sludge return pipe is connected to the water inlet tank, the sludge return pipe is provided with a first sludge discharge valve, the outlet of the sludge discharge pipe leads to a sludge treatment device, and the sludge discharge pipe is provided with a second sludge discharge valve;

[0017] The regulating tank also includes a sludge pump pit, in which the sludge pump, at least a portion of the sludge return pipe and a portion of the sludge discharge pipe are located.

[0018] In some embodiments, the rotation speed of the stirrer is greater than or equal to 20 rad / min and less than or equal to 80 rad / min;

[0019] The water inlet tank is connected to the water distribution tank through a first flow hole;

[0020] The first flow hole is adjacent to the bottom of the water inlet tank and the water distribution tank;

[0021] The first overflow hole is adjacent to the top of the water distribution tank and the rear chamber of the water distribution well;

[0022] The second flow hole is adjacent to the bottom of the water distribution tank and the water outlet tank;

[0023] The regulating tank is provided with a fourth opening and closing device for opening and closing the inlet of the main water outlet pipe.

[0024] In some embodiments, there are two primary sedimentation tanks, and the two primary sedimentation tanks are located on both sides of the regulating tank in the first direction;

[0025] The regulating tank comprises two water distribution well rear chambers, the two water distribution well rear chambers are respectively connected to the primary sedimentation tank water inlet pipes on the two primary sedimentation tanks in a one-to-one correspondence, and the two water distribution well rear chambers are located on both sides of the water distribution tank in the first direction;

[0026] The regulating tank comprises two sludge pump pits, which are located on both sides of the water inlet tank in the first direction, and the outlets of the primary sedimentation tank sludge pipes on the two primary sedimentation tanks extend into the two sludge pump pits respectively;

[0027] The primary sedimentation tank outlet pipes on the two primary sedimentation tanks are respectively connected to the two sides of the outlet tank in the first direction;

[0028] The main water inlet pipe, the water inlet tank, the water distribution tank, the water outlet tank and the main water outlet pipe are arranged in sequence in the second direction, and any two of the first direction, the second direction and the up and down directions are perpendicular to each other.

[0029] In some embodiments, the mass ratio of the sludge introduced into the water inlet tank by the sludge return pipe to the sludge discharged from the outlet of the primary sedimentation tank sludge discharge pipe is greater than or equal to 10% and less than or equal to 30%;

[0030] The scraper in the primary sedimentation tank can scrape the sludge into the sludge hopper of the primary sedimentation tank, and the sludge in the sludge hopper of the primary sedimentation tank is discharged once every 2 to 6 days.

[0031] In some embodiments, the COD concentration of the sewage discharged from the main water inlet pipe is less than or equal to 200 mg / L, and the suspended particle concentration of the sewage discharged from the main water inlet pipe is less than or equal to 400 mg / L, and the outlet of the water distribution tank is connected to the main water outlet pipe;

[0032] The COD concentration of the sewage discharged from the main water inlet pipe is greater than 200 mg / L, and / or the suspended particle concentration of the sewage discharged from the main water inlet pipe is greater than 400 mg / L, and the outlet of the water distribution tank is connected to the water inlet pipe of the primary sedimentation tank.

[0033] Beneficial effects of the present invention: The primary sedimentation tank water distribution and sludge discharge device according to the embodiment of the present invention can pass the sewage to be treated into the primary sedimentation tank or into the main outlet pipe according to the COD concentration and suspended matter concentration of the sewage to be treated. When the sewage to be treated is passed into the primary sedimentation tank, the fermented sludge in the primary sedimentation tank and the influent are fully mixed, so that the soluble organic matter and volatile fatty acids in the sludge are washed into the water, thereby realizing the release and recovery of the carbon source of the primary sedimentation sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 Schematic diagram of a water distribution and sludge discharge device for a primary sedimentation tank according to an embodiment of the present invention.

[0035] Figure 2 yes Figure 1 A partial enlarged view of .

[0036] Figure 3 yes Figure 1 Cross-sectional view of AA.

[0037] Figure 4 yes Figure 1 Cross-sectional view of BB.

[0038] Figure 5 yes Figure 1 Cross-sectional view of CC.

[0039] Figure numerals: 1, water inlet tank, 2, sludge pump pit, 3, water distribution tank, 4, rear chamber of water distribution well, 5, water outlet tank, 6, primary sedimentation tank, 11, main water inlet pipe, 12, agitator, 13, first flow hole, 21, sludge pump, 22, primary sedimentation tank sludge discharge pipe, 23, sludge return pipe, 24, first sludge discharge valve, 25, sludge discharge pipe, 26, second sludge discharge valve, 31, first overflow hole, 32, first opening and closing device, 33, second flow hole, 34, second opening and closing device, 41, primary sedimentation tank inlet pipe, 51, primary sedimentation tank outlet pipe, 52, third opening and closing device, 53, main water outlet pipe, 54, fourth opening and closing device, 61, primary sedimentation tank sludge hopper, 62, sludge scraper. DETAILED DESCRIPTION

[0040] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0041] The following describes the water distribution and mud discharge device for the primary sedimentation tank according to an embodiment of the present invention with reference to the accompanying drawings. Figures 1 to 5 As shown, the primary sedimentation tank water distribution and mud discharge device according to an embodiment of the present invention includes at least one primary sedimentation tank 6, a main water inlet pipe 11 and a water distribution tank 3.

[0042] The primary sedimentation tank 6 is provided with a primary sedimentation tank inlet pipe 41 and a primary sedimentation tank outlet pipe 51 connected thereto. The primary sedimentation tank inlet pipe 41 is used to introduce the sewage to be treated into the primary sedimentation tank 6, and the primary sedimentation tank outlet pipe 51 is used to discharge the treated sewage in the primary sedimentation tank 6. Specifically, after the sewage to be treated is introduced into the primary sedimentation tank 6 for sedimentation, the supernatant is discharged through the primary sedimentation tank outlet pipe 51, and then introduced into the main outlet pipe 53 for discharge. The outlet of the main outlet pipe 53 is connected to the subsequent sewage treatment equipment, that is, the sewage treated by the primary sedimentation tank 6 can be introduced into the subsequent sewage treatment equipment through the main outlet pipe 53 for communication.

[0043] The outlet of the main water inlet pipe 11 is used to discharge the sewage to be treated. The inlet of the water distribution tank 3 is connected to the outlet of the main water inlet pipe 11, and the outlet of the water distribution tank 3 can be selectively connected to one of the primary sedimentation tank inlet pipe 41 and the main water outlet pipe 53. That is to say, the sewage to be treated discharged from the main water inlet pipe 11 first passes into the water distribution tank 3, and then the sewage is distributed by the water distribution tank 3 to enter the primary sedimentation tank inlet pipe 41 or the main water outlet pipe 53. The sewage passed into the primary sedimentation tank inlet pipe 41 will enter the primary sedimentation tank 6 for sedimentation, and the sewage passed into the main water outlet pipe 53 can be directly passed into the subsequent sewage treatment equipment for treatment.

[0044] Specifically, the quality of the influent water of the sewage treatment plant will fluctuate (for example, due to seasonal changes, etc.), and the COD concentration in the influent is the chemical oxygen demand concentration of the sewage. The COD concentration of the sewage can approximately represent the concentration of organic matter in the water. If the organic matter concentration of the sewage discharged from the main water inlet pipe 11 is low, it means that there are few organic carbon sources in the sewage. After the sewage with low COD (chemical oxygen demand) enters the primary sedimentation tank 6, it cannot provide enough organic carbon sources for the sewage in the primary sedimentation tank 6. When the suspended solids concentration of the sewage to be treated (influent) discharged from the outlet of the main water inlet pipe 11 is low or the COD (chemical oxygen demand) is low, the sewage will cause the loss of the organic carbon source of the influent after passing through the primary sedimentation tank 6, and increase the energy consumption for treatment. Therefore, the suspended solids concentration of the sewage to be treated discharged from the outlet of the main water inlet pipe 11 is low or the COD (chemical oxygen demand) is low, and the outlet of the water distribution tank 3 is connected to the main outlet pipe 53. When the sewage needs to be precipitated and / or an organic carbon source needs to be provided for the sewage in the primary sedimentation tank 6 , the outlet of the water distribution tank 3 is connected to the water inlet pipe 41 of the primary sedimentation tank.

[0045] In some embodiments, the COD concentration of the sewage discharged from the main water inlet pipe 11 is less than or equal to the first preset value, and the suspended particle concentration of the sewage discharged from the main water inlet pipe 11 is less than or equal to the second preset value, and the outlet of the water distribution tank 3 is connected to the main water outlet pipe 53. Specifically, the COD concentration of the sewage discharged from the main water inlet pipe 11 is less than or equal to the first preset value, that is, the sewage to be treated cannot provide sufficient organic carbon source for the sewage in the primary sedimentation tank 6, and the suspended particle concentration of the sewage discharged from the main water inlet pipe 11 is less than or equal to the second preset value, that is, the suspended particle concentration of the sewage to be treated is low and no sedimentation is required, and the outlet of the water distribution tank 3 is connected to the main water outlet pipe 53, so that the sewage to be treated can be directly passed into the subsequent sewage treatment device.

[0046] The COD concentration of the sewage discharged from the main water inlet pipe 11 is greater than the first preset value, and / or the suspended particle concentration of the sewage discharged from the main water inlet pipe 11 is greater than the second preset value, and the outlet of the water distribution tank 3 is connected to the primary sedimentation tank inlet pipe 41. The COD concentration of the sewage discharged from the main water inlet pipe 11 is greater than the first preset value, and / or the suspended particle concentration of the sewage discharged from the main water inlet pipe 11 is greater than the second preset value, and the outlet of the water distribution tank 3 is connected with the water inlet pipe 41 of the primary sedimentation tank, including: a. The COD concentration of the sewage discharged from the main water inlet pipe 11 is greater than the first preset value, that is, the sewage to be treated can provide an organic carbon source for the sewage in the primary sedimentation tank 6, and the outlet of the water distribution tank 3 is connected with the water inlet pipe 41 of the primary sedimentation tank, so that the sewage to be treated enters the primary sedimentation tank 6 for sedimentation and provides an organic carbon source for the sewage in the primary sedimentation tank 6; b. The suspended particle concentration of the sewage discharged from the main water inlet pipe 11 is greater than the second preset value, and the outlet of the water distribution tank 3 is connected with the water inlet pipe 41 of the primary sedimentation tank, so that the sewage to be treated enters the primary sedimentation tank 6 for sedimentation; c. The COD concentration of the sewage discharged from the main water inlet pipe 11 is greater than the first preset value, and the suspended particle concentration of the sewage discharged from the main water inlet pipe 11 is greater than the second preset value, and the outlet of the water distribution tank 3 is connected with the water inlet pipe 41 of the primary sedimentation tank.

[0047] In some embodiments, the COD concentration of the sewage discharged from the main water inlet pipe 11 is less than or equal to 200 mg / L, and the suspended particle concentration of the sewage discharged from the main water inlet pipe 11 is less than or equal to 400 mg / L, and the outlet of the water distribution tank 3 is connected to the main water outlet pipe 53. In other words, the COD concentration of the sewage discharged from the main water inlet pipe 11 is less than or equal to 200 mg / L, and the suspended particle concentration is less than or equal to 400 mg / L, and the sewage to be treated does not need to enter the primary sedimentation tank 6.

[0048] The COD concentration of the sewage discharged from the main water inlet pipe 11 is greater than 200 mg / L, and / or the suspended particle concentration of the sewage discharged from the main water inlet pipe 11 is greater than 400 mg / L, and the outlet of the water distribution tank 3 is connected to the primary sedimentation tank inlet pipe 41. If the COD concentration of the sewage discharged from the main water inlet pipe 11 is less than or equal to 200 mg / L, the sewage to be treated enters the primary sedimentation tank 6; if the suspended particle concentration of the sewage discharged from the main water inlet pipe 11 is greater than 400 mg / L, the sewage to be treated enters the primary sedimentation tank 6.

[0049] like Figure 1 , Figure 2 and Figure 3 As shown, in some embodiments, the primary sedimentation tank 6 is provided with a primary sedimentation tank sludge discharge pipe 22 connected thereto, and when the outlet of the water distribution tank 3 is connected to the primary sedimentation tank water inlet pipe 41, the primary sedimentation tank sludge discharge pipe 22 can pass at least part of the sludge in the primary sedimentation tank 6 into the water distribution tank 3. Thus, part of the sludge discharged from the primary sedimentation tank 6 can be passed into the sewage to be treated, and then the sewage to be treated is passed into the primary sedimentation tank 6, so that the organic carbon source in the primary sedimentation tank 6 (supernatant) can be increased while the sewage to be treated is precipitated.

[0050] like Figures 1 to 5 As shown, in some embodiments, the primary sedimentation tank water distribution and sludge discharge device includes a regulating tank, the regulating tank includes an inlet tank 1 and a distribution tank 3, the outlet of the main water inlet pipe 11, the inlet tank 1 and the distribution tank 3 are connected in sequence, the inlet tank 1 is provided with an agitator 12, and the primary sedimentation tank sludge discharge pipe 22 can pass the sludge in the primary sedimentation tank 6 into the inlet tank 1. Therefore, when sewage is passed into the primary sedimentation tank 6 and sludge needs to be added to the primary sedimentation tank 6, the sludge in the primary sedimentation tank 6 can be passed into the inlet tank 1 through the primary sedimentation tank sludge discharge pipe 22, and the agitator 12 in the inlet tank 1 rotates, so that the sludge can be fully mixed with the sewage in the inlet tank 1, so that it can enter the primary sedimentation tank 6 with the sewage. For example, the inlet tank 1 is connected with the distribution tank 3 through the first flow hole 13, and the first flow hole 13 is adjacent to the bottom of the inlet tank 1 and the distribution tank 3.

[0051] In some embodiments, the rotation speed of the agitator 12 is greater than or equal to 20 rad / min and less than or equal to 80 rad / min. Specifically, the greater the rotation speed of the agitator 12, the more uniform the sludge and sewage in the water inlet tank 1 can be mixed. For example, the rotation speed of the agitator 12 can be 30 rad / min, 40 rad / min, 50 rad / min, 60 rad / min or 70 rad / min.

[0052] For example, the primary sludge is returned to the inlet well 1, and the dissolved organic matter in the sludge is washed into the water by the mechanical agitator 12. The sludge retention time in the primary sedimentation tank is 2 days, the rotation speed of the mechanical agitator 12 in the inlet well is 20rad / min, and when the primary sludge return ratio is 10%, the volatile fatty acids (VFA) in the effluent of the primary sedimentation tank 6 increases by 12%. The rotation speed of the mechanical agitator 12 is 40rad / min, and the volatile fatty acids (VFA) in the effluent of the primary sedimentation tank 6 increases by 15%. The rotation speed of the mechanical agitator 12 is 60rad / min, and the volatile fatty acids (VFA) in the effluent of the primary sedimentation tank 6 increases by 18%. The rotation speed of the mechanical agitator 12 is 80rad / min, and the volatile fatty acids (VFA) in the effluent of the primary sedimentation tank 6 increases by 20%. When the primary sludge return ratio is 20%, the volatile fatty acids (VFA) in the effluent of the primary sedimentation tank 6 increases by 16%. When the primary sludge return ratio was 30%, the volatile fatty acids (VFA) in the effluent of primary sedimentation tank 6 increased by 17%.

[0053] like Figures 1 to 5 As shown, in some embodiments, the regulating tank also includes a water outlet tank 5 and a water distribution well rear chamber 4.

[0054] The water distribution tank 3 is connected to the rear chamber 4 of the water distribution well through the first overflow hole 31, and the primary sedimentation tank water inlet pipe 41 is connected to the rear chamber 4 of the water distribution well. Thus, the sewage in the water distribution tank 3 can overflow into the rear chamber 4 of the water distribution well through the first overflow hole 31, and then enter the primary sedimentation tank 6 through the primary sedimentation tank water inlet pipe 41. For example, the first overflow hole 31 is adjacent to the top of the water distribution tank 3 and the rear chamber 4 of the water distribution well.

[0055] The water distribution tank 3 is connected to the outlet tank 5 through the second flow hole 33, and the outlet tank 5 is connected to the outlet of the primary sedimentation tank outlet pipe 51 and the inlet of the main outlet pipe 53. As a result, the sewage in the water distribution tank 2 can enter the outlet tank 5 through the second flow hole 33, and the supernatant in the primary sedimentation tank 6 can enter the outlet tank 5 through the primary sedimentation tank outlet pipe 51. The sewage entering the outlet tank 5 can be discharged from the main outlet pipe 53 and then passed into the subsequent sewage treatment equipment. For example, the second flow hole 33 is adjacent to the bottom of the water distribution tank 3 and the outlet tank.

[0056] The regulating tank is provided with a first opening and closing device 32 for opening and closing the first overflow hole 31, a second opening and closing device 34 for opening and closing the second flow hole 33, a third opening and closing device 52 for opening and closing the outlet of the primary sedimentation tank outlet pipe 51, and a fourth opening and closing device 54 for opening and closing the inlet of the main outlet pipe 53. For example, the first opening and closing device 32, the second opening and closing device 34, the third opening and closing device 52 and the fourth opening and closing device 54 are gates equipped with a hand-operated dual-purpose opening and closing machine and can realize remote control.

[0057] Specifically, when the COD concentration and suspended particle concentration of the sewage discharged from the main water inlet pipe 11 are low, and the sewage to be treated does not need to enter the primary sedimentation tank 6, the first opening and closing device 32 closes the first overflow hole 31, the third opening and closing device 52 closes the outlet of the primary sedimentation tank outlet pipe 51, the second opening and closing device 34 opens the second flow hole 33, and the fourth opening and closing device 54 opens the inlet of the main water outlet pipe 53. So that the influent flows through the first flow hole 13 and the second flow hole 33 and is discharged to the subsequent treatment section through the main water outlet pipe 53. Under this working condition, the influent exceeds the primary sedimentation tank 6, and the primary sedimentation tank 6 is in a shutdown state; the agitator 12 in the influent tank 1, the sludge pump 21 in the sludge pump pit 2, and the first sludge valve 23 are all in a closed state. The influent exceeds the primary sedimentation tank, ensuring the COD concentration of the biochemical treatment section and reducing the treatment cost.

[0058] When at least one of the COD concentration and the suspended particle concentration of the sewage discharged from the main water inlet pipe 11 is high, when the sewage to be treated needs to enter the primary sedimentation tank 6, the first opening and closing device 32 opens the first overflow hole 31, the third opening and closing device 52 opens the outlet of the primary sedimentation tank outlet pipe 51, the second opening and closing device 34 closes the second flow hole 33, and the fourth opening and closing device 54 opens the inlet of the main water outlet pipe 53. So that the influent flows through the first flow hole 13 and the first overflow hole 31 of the device and then enters the primary sedimentation tank 6 through the primary sedimentation tank inlet pipe 41, and the supernatant after precipitation is discharged to the outlet tank 5 of the device through the primary sedimentation tank outlet pipe 51, and then discharged to the subsequent treatment section through the main water outlet pipe 53. Under this operating condition, the primary sedimentation tank 6 is in operation, and the influent is processed through the primary sedimentation tank 6 to remove solid particles and suspended matter in the water; the settled sludge enters the sludge hopper 61 of the primary sedimentation tank and is fermented, and the fermented sludge is lifted by the sludge pump 21, and then partially returned to the inlet well 1 through the sludge return pipe 23, and under the action of the agitator 12 in the inlet well 1, the influent and the fermented sludge are fully mixed, so that the soluble organic matter and volatile fatty acids in the sludge are washed into the water, thereby realizing the release and recovery of the carbon source of the sludge in the primary sedimentation tank 6.

[0059] like Figures 1 to 5 As shown, in some embodiments, a sludge pump 21 is provided at the outlet of the primary sedimentation tank sludge discharge pipe 22, and the outlet of the sludge pump 21 is connected to the sludge return pipe 23 and the sludge discharge pipe 25. The outlet of the sludge return pipe 23 is connected to the water inlet tank 1, and a first sludge valve 24 is provided on the sludge return pipe 23. The outlet of the sludge discharge pipe 25 leads to the sludge treatment device, and a second sludge valve 26 is provided on the sludge discharge pipe 25. Specifically, the sludge pump 21 and the first sludge valve 24 are opened to allow sludge to be introduced into the water inlet tank 1. For example, the first sludge valve 24 and the second sludge valve 26 are both electric sludge valves, which can be remotely controlled.

[0060] The regulating tank also includes a sludge pump pit 2, in which the sludge pump 21, at least part of the sludge return pipe 23 and part of the sludge discharge pipe 25 are located. That is, the sludge pump pit 2 is a room that accommodates the sludge pump 21, at least part of the sludge return pipe 23 and part of the sludge discharge pipe 25.

[0061] In some embodiments, the mass ratio of the sludge introduced into the inlet tank 1 by the sludge return pipe 23 to the sludge discharged from the outlet of the primary sedimentation tank sludge discharge pipe 22 is greater than or equal to 10% and less than or equal to 30%. In other words, 10% to 30% of the sludge discharged from the primary sedimentation tank 6 can be introduced into the inlet tank 1 so as to be introduced into the primary sedimentation tank 6 again as an organic carbon source.

[0062] like Figure 1As shown, the scraper 62 in the primary sedimentation tank 6 can scrape the sludge into the sludge hopper 61 of the primary sedimentation tank, and the sludge in the sludge hopper 61 of the primary sedimentation tank is discharged once every 2 to 6 days. Specifically, the sludge can be passed into the inlet tank 1 when the primary sedimentation tank 6 is discharged, so that the sludge is fermented in the sludge hopper 61 of the primary sedimentation tank for 2 to 6 days.

[0063] There can be multiple primary sedimentation tanks 6, that is, the regulating tank can distribute water and add sludge to multiple primary sedimentation tanks 6.

[0064] In some embodiments, there are two primary settling tanks 6, and the two primary settling tanks 6 are located on both sides of the regulating tank in the first direction. The regulating tank includes two water distribution well rear chambers 4, and the two water distribution well rear chambers 4 are respectively connected to the primary settling tank inlet pipes 41 on the two primary settling tanks 6 in a one-to-one correspondence, and the two water distribution well rear chambers 4 are located on both sides of the water distribution tank 3 in the first direction. The number of primary settling tanks 6 in operation can be adjusted according to the water inflow. For example, when the water inflow is less than 50% of the designed water volume, one primary settling tank 6 is operated.

[0065] The regulating tank includes two sludge pump pits 2, which are located on both sides of the water inlet tank 1 in the first direction, and the outlets of the primary sedimentation tank sludge pipes 22 on the two primary sedimentation tanks 6 extend into the two sludge pump pits 2 respectively. That is, the two sludge pump pits 2 are respectively matched with the primary sedimentation tank sludge pipes 22 of the two primary sedimentation tanks 6 so as to install the corresponding sludge pumps 21. The primary sedimentation tank outlet pipes 51 on the two primary sedimentation tanks 6 are respectively connected to the two sides of the outlet tank 5 in the first direction. The main water inlet pipe 11, the water inlet tank 1, the water distribution tank 3, the outlet tank 5 and the main water outlet pipe 53 are arranged in sequence in the second direction, the water distribution well rear chamber 4 and the outlet tank 5, and the corresponding sludge pump pits 2 are adjacent in the second direction, and any two of the first direction, the second direction and the up and down directions are perpendicular to each other.

[0066] Specifically, the regulating tank integrates an inlet tank 1, two mud pump pits 2, a water distribution tank 3, two water distribution well back chambers 4 and a water outlet tank 5, and the adjacent two of the inlet tank 1, mud pump pit 2, water distribution tank 3, water distribution well back chamber 4 and water outlet tank 5 are separated by a wall to reduce the occupied space. For example, the regulating tank is a rectangular structure, the inlet tank 1, mud pump pit 2, water distribution tank 3, water distribution well back chamber 4 and water outlet tank 5 are all rectangular structures, and the size of the water outlet tank 5 in the first direction, the size of the inlet tank 1 and the two mud pump pits 2 in the first direction, and the size of the water distribution tank 3 and the two water distribution well back chambers 4 in the first direction are equal.

[0067] The primary sedimentation tank water distribution and sludge discharge device according to the embodiment of the present invention can pass the sewage to be treated into the primary sedimentation tank 6 or into the main outlet pipe 53 according to the COD (chemical oxygen demand) concentration and suspended matter concentration of the sewage to be treated. When the sewage to be treated is passed into the primary sedimentation tank 6, the fermented sludge in the primary sedimentation tank and the influent are fully mixed, so that the soluble organic matter and volatile fatty acids in the sludge are washed into the water, thereby realizing the release and recovery of the carbon source of the primary sedimentation sludge.

[0068] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0069] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0070] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0072] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0073] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A water distribution and mud discharge device for a primary sedimentation tank, characterized in that: include: At least one primary sedimentation tank, the primary sedimentation tank being provided with a primary sedimentation tank water inlet pipe and a primary sedimentation tank water outlet pipe connected thereto, the primary sedimentation tank water inlet pipe being used to introduce the sewage to be treated into the primary sedimentation tank, and the primary sedimentation tank water outlet pipe being used to discharge the treated sewage in the primary sedimentation tank; A main water inlet pipe, the outlet of which is used to discharge the sewage to be treated; A water distribution tank, the inlet of which is connected to the outlet of the main water inlet pipe, and the outlet of which can be selectively connected to one of the primary sedimentation tank inlet pipe and the main water outlet pipe.

2. The water distribution and mud discharge device for the primary sedimentation tank according to claim 1, characterized in that: The COD concentration of the sewage discharged from the main water inlet pipe is less than or equal to a first preset value, and the suspended particle concentration of the sewage discharged from the main water inlet pipe is less than or equal to a second preset value, and the outlet of the water distribution tank is connected to the main water outlet pipe; The COD concentration of the sewage discharged from the main water inlet pipe is greater than the first preset value, and / or the suspended particle concentration of the sewage discharged from the main water inlet pipe is greater than the second preset value, and the outlet of the water distribution tank is connected to the water inlet pipe of the primary sedimentation tank.

3. The water distribution and mud discharge device for the primary sedimentation tank according to claim 1 or 2, characterized in that: The primary settling tank is provided with a primary settling tank sludge discharge pipe connected thereto. When the outlet of the water distribution tank is connected to the water inlet pipe of the primary settling tank, the primary settling tank sludge discharge pipe can pass at least part of the sludge in the primary settling tank into the water distribution tank.

4. The water distribution and mud discharge device for the primary sedimentation tank according to claim 3, characterized in that: The primary sedimentation tank water distribution and sludge discharge device includes a regulating tank, the regulating tank includes an inlet tank and the water distribution tank, the outlet of the main water inlet pipe, the inlet tank and the water distribution tank are connected in sequence, an agitator is provided in the inlet tank, and the primary sedimentation tank sludge discharge pipe can pass the sludge in the primary sedimentation tank into the inlet tank.

5. The water distribution and mud discharge device for the primary sedimentation tank according to claim 4, characterized in that: The regulating pool also includes a water outlet pool and a water distribution well back chamber; The water distribution tank is connected to the rear chamber of the water distribution well through the first overflow hole, and the water inlet pipe of the primary sedimentation tank is connected to the rear chamber of the water distribution well; The water distribution tank is connected to the water outlet tank through a second flow hole, and the water outlet tank is connected to the outlet of the primary sedimentation tank outlet pipe and the inlet of the main outlet pipe; The regulating tank is provided with a first opening and closing device for opening and closing the first overflow hole, a second opening and closing device for opening and closing the second flow hole, and a third opening and closing device for opening and closing the outlet of the primary sedimentation tank outlet pipe.

6. The water distribution and mud discharge device for the primary sedimentation tank according to claim 5, characterized in that: A sludge pump is provided at the outlet of the primary sedimentation tank sludge discharge pipe, the outlet of the sludge pump is connected to the sludge return pipe and the sludge discharge pipe, the outlet of the sludge return pipe is connected to the water inlet tank, a first sludge discharge valve is provided on the sludge return pipe, the outlet of the sludge discharge pipe leads to the sludge treatment device, and a second sludge discharge valve is provided on the sludge discharge pipe; The regulating tank also includes a sludge pump pit, in which the sludge pump, at least a portion of the sludge return pipe and a portion of the sludge discharge pipe are located.

7. The water distribution and mud discharge device for the primary sedimentation tank according to claim 6, characterized in that: The rotation speed of the stirrer is greater than or equal to 20 rad / min and less than or equal to 80 rad / min; The water inlet tank is connected to the water distribution tank through a first flow hole; The first flow hole is adjacent to the bottom of the water inlet tank and the water distribution tank; The first overflow hole is adjacent to the top of the water distribution tank and the rear chamber of the water distribution well; The second flow hole is adjacent to the bottom of the water distribution tank and the water outlet tank; The regulating tank is provided with a fourth opening and closing device for opening and closing the inlet of the main water outlet pipe.

8. The water distribution and mud discharge device for the primary sedimentation tank according to claim 6, characterized in that: There are two primary sedimentation tanks, and the two primary sedimentation tanks are located on both sides of the regulating tank in the first direction; The regulating tank comprises two water distribution well rear chambers, the two water distribution well rear chambers are respectively connected to the primary sedimentation tank water inlet pipes on the two primary sedimentation tanks in a one-to-one correspondence, and the two water distribution well rear chambers are located on both sides of the water distribution tank in the first direction; The regulating tank comprises two sludge pump pits, which are located on both sides of the water inlet tank in the first direction, and the outlets of the primary sedimentation tank sludge pipes on the two primary sedimentation tanks extend into the two sludge pump pits respectively; The primary sedimentation tank outlet pipes on the two primary sedimentation tanks are respectively connected to the two sides of the outlet tank in the first direction; The main water inlet pipe, the water inlet tank, the water distribution tank, the water outlet tank and the main water outlet pipe are arranged in sequence in the second direction, and any two of the first direction, the second direction and the up and down directions are perpendicular to each other.

9. The water distribution and mud discharge device for the primary sedimentation tank according to claim 6, characterized in that: The mass ratio of the sludge introduced into the water inlet tank by the sludge return pipe to the sludge discharged from the outlet of the primary sedimentation tank sludge discharge pipe is greater than or equal to 10% and less than or equal to 30%; The scraper in the primary sedimentation tank can scrape the sludge into the sludge hopper of the primary sedimentation tank, and the sludge in the sludge hopper of the primary sedimentation tank is discharged once every 2 to 6 days.

10. The water distribution and mud discharge device for the primary sedimentation tank according to claim 2, characterized in that: The COD concentration of the sewage discharged from the main water inlet pipe is less than or equal to 200 mg / L, and the suspended particle concentration of the sewage discharged from the main water inlet pipe is less than or equal to 400 mg / L, and the outlet of the water distribution tank is connected to the main water outlet pipe; The COD concentration of the sewage discharged from the main water inlet pipe is greater than 200 mg / L, and / or the suspended particle concentration of the sewage discharged from the main water inlet pipe is greater than 400 mg / L, and the outlet of the water distribution tank is connected to the water inlet pipe of the primary sedimentation tank.

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