Agricultural pollution distribution system and method of controlling the same

Abstract

The application relates to the technical field of sewage treatment, in particular to a farm sewage distribution system and a control method thereof. The system comprises a farm sewage distribution unit, a sludge feeding unit, a sludge screening unit and a dosing unit. The farm sewage distribution unit and the sludge feeding unit are communicated with the dosing unit, and the sludge feeding unit, the sludge screening unit and the farm sewage distribution unit are communicated in sequence. The sludge screening unit is used for receiving sludge sent from the sludge feeding unit and separating heavy sludge in the sludge. The farm sewage distribution unit is used for receiving raw water, liquid medicine sent from the dosing unit and heavy sludge sent from the sludge screening unit. The farm sewage distribution unit distributes the mixture of the raw water, the liquid medicine and the heavy sludge to multiple biochemical pools of a biochemical treatment unit. The application aims to solve at least one technical problem in the background art and provides a farm sewage distribution system and a control method thereof.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a farm sewage distribution system and a control method thereof. BACKGROUND

[0002] For the farm sewage station, the total treatment water volume is less than 500m 3 / d, and the biochemical treatment unit adopts the application condition of equal specification multi-series parallel connection, and the daily average treatment water volume of a single series is 20-60m3 / d. Due to the uneven inflow water quantity and quality of the multi-series biochemical pool which is the core key pollution removal function, the treatment water volume load and the pollution load of each series of biochemical pools are greatly unevenly distributed (high and low water volume load or water quality load appears), which often causes the biochemical operation condition to be extremely unstable, the biochemical treatment unit effluent pollutant purification removal rate is not high, the operation energy consumption and material consumption are extensive and difficult to control, the water, mud and drug distribution effect is poor, and the biochemical resilience to water volume and water quality impact (especially the drainage flow and pollution discharge law of early, middle and late or holidays) is insufficient. SUMMARY

[0003] The present application aims to solve at least one technical problem involved in the background art, and provides a farm sewage distribution system and a control method thereof.

[0004] In order to achieve the above-mentioned purpose, the following technical solutions are adopted in the present application:

[0005] One aspect of the present application provides a farm sewage distribution system, which comprises a farm sewage distribution unit, a sludge adding unit, a sludge screening unit and a dosing unit, the farm sewage distribution unit and the sludge adding unit are in communication with the dosing unit, and the sludge adding unit, the sludge screening unit and the farm sewage distribution unit are in communication in sequence.

[0006] The sludge screening unit is used for receiving sludge sent out from the sludge adding unit and separating heavy sludge in the sludge.

[0007] The farm sewage distribution unit is used for receiving raw water, liquid medicine sent out from the dosing unit and heavy sludge sent out from the sludge screening unit.

[0008] And the farm sewage distribution unit is used for distributing the mixture of the raw water, the liquid medicine and the heavy sludge to a plurality of biochemical pools of a biochemical treatment unit.

[0009] Optionally, the agricultural pollution distribution unit comprises a containing groove and an inflow energy dissipation pipe, the inflow energy dissipation pipe comprises a cylindrical pipe part and a circular truncated cone pipe part arranged coaxially, the circular truncated cone pipe part is located in the containing groove, the top end of the cylindrical pipe part is the same in diameter as the smaller-diameter end of the circular truncated cone pipe part, and the top end of the cylindrical pipe part is fixedly connected with the smaller-diameter end of the circular truncated cone pipe part, the smaller-diameter end of the circular truncated cone pipe part is located below the larger-diameter end of the circular truncated cone pipe part, and the bottom end of the cylindrical pipe part is a closed end, and the raw water source and the sludge screening unit are both in communication with the cylindrical pipe part.

[0010] Optionally, the agricultural pollution distribution unit comprises a plurality of flow uniformizing pipes, the containing groove is cylindrical, and the flow uniformizing pipes are uniformly distributed around the central axis of the containing groove, and the inflow energy dissipation pipe is arranged coaxially with the containing groove.

[0011] The agricultural pollution distribution unit further comprises a plurality of partition plates uniformly fixed to the inner wall of the containing groove, the partition plates are uniformly distributed in the circumferential direction of the containing groove, and the partition plates extend in the radial direction of the containing groove, and the flow uniformizing pipes and the partition plates are alternately arranged in the circumferential direction of the containing groove.

[0012] Optionally, the agricultural pollution distribution unit further comprises a gas distribution assembly, the gas distribution assembly comprises a gas flow scouring sludge gas source, an annular gas distribution pipe located in the containing groove, and a plurality of radial gas distribution pipes fixed to the annular gas distribution pipe, the annular gas distribution pipe and the radial gas distribution pipes are arranged at the bottom of the containing groove, the annular gas distribution pipe is in communication with the gas flow scouring sludge gas source, the annular gas distribution pipe is sleeved outside the inflow energy dissipation pipe, and the annular gas distribution pipe is arranged coaxially with the inflow energy dissipation pipe, the radial gas distribution pipes are located outside the annular gas distribution pipe, and the positions of the radial gas distribution pipes correspond to the positions of the flow uniformizing pipes one by one.

[0013] Optionally, the sludge dosing unit comprises a discharge pipe, a sludge activation tank, a driving member, an activation gas source, an annular gas pipe, and a stirring member, the stirring member and the annular gas pipe are arranged in the sludge activation tank, the driving member is in transmission connection with the stirring member, the activation gas source is in communication with the annular gas pipe, the annular gas pipe is arranged at the bottom of the sludge activation tank, a plurality of gas holes are formed in the annular gas pipe, the gas holes are uniformly distributed in the circumferential direction of the annular gas pipe, a material collecting groove is formed at the bottom of the sludge activation tank, a mesh grid is arranged at the groove opening of the material collecting groove, and the discharge pipe is in communication with the material collecting groove.

[0014] Optionally, the sludge screening unit comprises a top flow pipe, a total feed pipe, a total bottom flow pipe and a light-heavy flow vortex flow channeling separator, the light-heavy flow vortex flow channeling separator having a feed port, a top flow outlet and a bottom flow outlet, one end of the total feed pipe being connected to the feed port, the other end of the total feed pipe being connected to the sludge feeding unit, the top flow pipe being connected to the top flow outlet, one end of the total bottom flow pipe being connected to the bottom flow outlet, the other end of the total bottom flow pipe being connected to the inflow energy dissipation pipe.

[0015] Optionally, the sludge screening unit further comprises a first sub-feed pipe, a second sub-feed pipe, a first sub-bottom flow pipe, a second sub-bottom flow pipe and a settling ratio measurer, the total feed pipe being connected to the feed port through the first sub-feed pipe, the total feed pipe being connected to the settling ratio measurer through the second sub-feed pipe, the total bottom flow pipe being connected to the inflow energy dissipation pipe through the first sub-bottom flow pipe, the total bottom flow pipe being connected to the settling ratio measurer through the second sub-bottom flow pipe, valves being respectively arranged on the first sub-feed pipe, the second sub-feed pipe, the first sub-bottom flow pipe and the second sub-bottom flow pipe.

[0016] Optionally, the dosing unit comprises a liquid medicine calibration scale, a main pipeline, a series pipeline, a plurality of medicine storage barrels and a plurality of parallel pipelines, each of the medicine storage barrels being connected to one of the parallel pipelines in one-to-one correspondence, each of the parallel pipelines being connected to the main pipeline, the main pipeline being in communication with the liquid medicine calibration scale, a parallel valve being arranged on each of the parallel pipelines, each of the medicine storage barrels being connected to each other in series through the series pipeline, a series valve being arranged between each of the adjacent medicine storage barrels on the series pipeline, the sludge distribution unit and the sludge feeding unit being in communication with the liquid medicine calibration scale.

[0017] Another aspect of the present application provides a control method of a sludge distribution system, which is implemented by using the sludge distribution system provided by the present application, and the method comprises the following steps:

[0018] acquiring a real-time sludge weight value in the sludge feeding unit;

[0019] if it is detected that the current sludge weight value is equal to or greater than a preset material weight value,

[0020] controlling the dosing unit to add liquid medicine into the sludge feeding unit, and controlling the sludge feeding unit to activate the sludge in the sludge feeding unit and send the sludge to the sludge screening unit,

[0021] controlling the sludge screening unit to separate the sludge into light sludge and heavy sludge, and send the heavy sludge to the sludge distribution unit.

[0022] Optionally, the sludge adding unit comprises a sludge activation tank for containing sludge, a driving member for driving a stirring member to stir the sludge in the sludge activation tank, and an activation gas source for aeration in the sludge activation tank; the sludge screening unit comprises a light-heavy flow vortex flow channeling separator and a settling ratio measurer.

[0023] Correspondingly, the control of the sludge adding unit to activate the sludge in the sludge adding unit comprises: alternately starting the driving member and the activation gas source.

[0024] And / or, the sending of the sludge to the sludge screening unit comprises:

[0025] sending the sludge to the light-heavy flow vortex flow channeling separator and the settling ratio measurer respectively,

[0026] obtaining a primary sludge settling ratio and a primary density value of the sludge in the settling ratio measurer while controlling the light-heavy flow vortex flow channeling separator to separate the sludge into light sludge and heavy sludge,

[0027] controlling the settling ratio measurer to be emptied and sending part of the heavy sludge separated by the light-heavy flow vortex flow channeling separator to the settling ratio measurer to obtain a secondary sludge settling ratio and a secondary density value of the sludge in the settling ratio measurer,

[0028] comparing the primary sludge settling ratio with the secondary sludge settling ratio, and comparing the primary density value with the secondary density value, and obtaining data.

[0029] The technical scheme provided by the present application can achieve at least one of the following beneficial effects:

[0030] The agricultural pollution distribution system and the control method thereof provided by the present application use an agricultural pollution distribution unit to distribute the mixture of the raw water, the liquid medicine and the heavy sludge to a plurality of biochemical pools of a biochemical treatment unit, so that the inflow of each biochemical pool is relatively uniform, thereby improving the problems that the treatment water load and the pollutant load between the series of biochemical pools are greatly unevenly distributed, the biochemical operation condition is extremely unstable, the pollutant removal rate of the effluent of the biochemical treatment unit is not high, the operation energy consumption and material consumption are extensive and difficult to control, the water distribution, sludge distribution and medicine distribution effect is poor, and the biochemical resilience to water quantity and water quality impact is insufficient.

[0031] The additional technical features and advantages of the present application will be more apparent in the following description or can be understood through the specific implementation of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application, the drawings needed to be used in the description of the specific embodiments will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0033] Figure 1 The structural schematic diagram of an embodiment of the agricultural pollution distribution system provided by the present application is shown, wherein the arrows represent the fluid flow direction.

[0034] Figure 2 The structural schematic diagram of an embodiment of the inflow energy dissipation pipe provided by the present application is shown, wherein the arrows represent the fluid flow direction.

[0035] Figure 3 The structural schematic diagram of an embodiment of the flow equalizing pipe provided by the present application is shown.

[0036] Figure 4 The structural schematic diagram of another embodiment of the flow equalizing pipe provided by the present application is shown.

[0037] Figure 5 The structural schematic diagram of an embodiment of the agricultural pollution distribution unit provided by the present application is shown.

[0038] Figure 6 The structural schematic diagram of an embodiment of the agricultural pollution distribution unit provided by the present application is shown.

[0039] Figure 7 The structural schematic diagram of an embodiment of the air distribution assembly provided by the present application is shown.

[0040] Figure 8 The structural schematic diagram of an embodiment of the sludge screening unit provided by the present application is shown.

[0041] Figure 9 The structural schematic diagram of an embodiment of the sludge adding unit provided by the present application is shown.

[0042] Figure 10 The structural schematic diagram of an embodiment of the drug adding unit provided by the present application is shown.

[0043] Figure 11 The structural schematic diagram of an embodiment of the drug adding unit provided by the present application is shown.

[0044] Figure 12 The structural schematic diagram of an embodiment of the drug adding unit provided by the present application is shown.

[0045] Figure 13 A schematic diagram of fluid flow direction in the agricultural pollution distribution system provided by the embodiments of the present application, wherein the arrows represent the fluid flow direction;

[0046] Figure 14 A flowchart of one embodiment of the control method of the agricultural pollution distribution system provided by the embodiments of the present application.

[0047] Reference signs:

[0048] 1 - holding tank; 12 - central hole; 122 - through hole; 131 - partition plate; 14 - biochemical pool; 2 - inflow energy dissipation pipe; 21a - communication hole; 21b - cylindrical pipe part; 22b - circular truncated cone pipe part; 3 - flow equalization pipe; 321 - cross pipe; 322b - flow equalization pipe body; 322c - overflow port; 3a - inflow port; 3a' - pipe blocking piece; 4 - air distribution assembly; 41 - annular air distribution pipe; 421 - radial air distribution pipe; 43 - flow scouring and deposition air source; 5 - sludge selection screen unit; 51 - light and heavy flow vortex flow channel separator; 52 - sedimentation ratio measurer; 52a - valve; 52b - valve; 52c - liquid discharge valve port; 531 - first sub-feeding pipe; 532 - second sub-feeding pipe; 533 - total underflow pipe; 533a - first sub-underflow pipe; 533b - second sub-underflow pipe; 534 - top flow pipe; 53a - valve; 53b - valve; 54 - light sludge collection part; 6 - sludge adding unit; 60 - sludge activation tank; 60a - material collection tank; 61 - external sludge source; 61a - opening; 62 - external water source; 63 - auxiliary material; 631 - inorganic accelerated aid settling carrier; 632 - nucleation flocculation liquid; 64 - activation air source; 64a - annular air pipe; 65 - stirring piece; 66 - discharge pipe; 66a - net barrier grid; 67a - hand push handle; 67b - sliding universal wheel; 67b1 - position locking piece; 7 - dosing unit; 71 - storage barrel; 71a - hook; 721 - parallel pipeline; 721a - parallel valve; 721b - series pipeline; 722 - main pipeline; 73 - liquid calibration scale; 740 - pipeline; 740a - valve; 741 - pipeline; 741a - valve; 742 - pipeline; 742a - valve; 75 - safety protection cover; 751 - box door cover; 752a - liquid storage barrel observation area; 752b - scale observation area; 753 - anti-theft lock part; 754 - hoisting lug part; 75a - buried fixing bolt piece; 8 - inflow amount adjusting part; 80 - raw water water taking facility point; 81 - raw water input pipe; 82 - main inflow pipe; 83 - return pipe; 8a - flow meter; 8b - valve; 8c - valve; 9 - emptying part; 14 - biochemical pool. DETAILED DESCRIPTION

[0049] The technical solutions of the present application will be described clearly and completely in connection with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0050] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0052] As shown in Figures 1 to 13 One aspect of the present application provides a farm pollution distribution system, which comprises a farm pollution distribution unit, a sludge adding unit 6, a sludge screening unit 5 and a dosing unit 7, the farm pollution distribution unit and the sludge adding unit 6 are communicated with the dosing unit 7, the sludge adding unit 6, the sludge screening unit 5 and the farm pollution distribution unit are communicated in sequence;

[0053] The sludge screening unit 5 is used for receiving sludge sent out from the sludge adding unit 6, and separating heavy sludge in the sludge;

[0054] The farm pollution distribution unit is used for receiving raw water, liquid medicine sent out from the dosing unit 7 and heavy sludge sent out from the sludge screening unit 5;

[0055] The agricultural pollution distribution unit is used to distribute the mixture of the raw water, the liquid medicine and the heavy sludge to a plurality of biochemical pools 14 of a biochemical treatment unit. It can be understood that the biochemical treatment unit in the embodiment of the present application comprises a plurality of biochemical pools 14 of the same specification operating in parallel. Preferably, the agricultural pollution distribution unit is used to distribute the mixture of the raw water, the liquid medicine and the heavy sludge after balancing the quality to a plurality of biochemical pools 14 of the same specification operating in parallel in the biochemical treatment unit.

[0056] The agricultural pollution distribution system provided by the present application adopts an agricultural pollution distribution unit to distribute the mixture of the raw water, the liquid medicine and the heavy sludge after balancing the quality to a plurality of biochemical pools 14 of the same specification operating in parallel in the biochemical treatment unit, so as to make the inflow of each biochemical pool 14 relatively uniform, and to improve the key deployment and operation short board between the series of biochemical pools 14, such as the great imbalance in the deployment and distribution of the water load and the pollutant load, the biochemical operation condition being often extremely unstable, the low removal rate of the pollutants in the effluent of the biochemical treatment unit, the extensive and difficult-to-control energy consumption and material consumption in the operation, the poor effect of water distribution, sludge distribution and medicine distribution, and the insufficient resilience of the biochemical system in response to the water quantity and water quality impact.

[0057] Alternatively, the agricultural pollution distribution unit comprises a containing groove 1 and a plurality of flow equalization pipes 3, the flow equalization pipes 3 are provided with inflow ports 3a and overflow ports 322c which are located in the containing groove 1, the inflow ports 3a are formed on the inner wall of the flow equalization pipes 3, the overflow ports 322c are located at the top end of the flow equalization pipes 3, and the overflow ports 322c are located below the groove opening of the containing groove 1, and each flow equalization pipe 3 is used to communicate with each biochemical pool 14 one by one. In the embodiment of the present application, preferably, the length direction of the flow equalization pipe 3 is the vertical direction, a transversely extending transverse pipe 321 (which is preferably a short transverse pipe) is arranged at a proper position of the lower part of the overflow port, the inflow port 3a is preferably the port of the transverse pipe 321, and the overflow port 322c of the flow equalization pipe 3 is preferably located at 100-300 mm below the groove opening of the containing groove 1, so as to prevent the overflow caused by the excessive flow rate of the outflow from the overflow port 322c of the flow equalization pipe 3, the overflow port 322c serving as a secondary shunt second channel for preventing overflow when the overflow of the containing groove 1 is too large, and serving as a shunt supplement measure for the inflow port 3a; preferably, the agricultural pollution distribution unit further comprises a plurality of pipe blocking pieces used to detachably cooperate with the inflow ports 3a, each pipe blocking piece is used to cooperate with each inflow port 3a one by one, and when one or more flow equalization pipes 3 are idle, the corresponding pipe blocking piece 3a' can be used to block the inflow port 3a (for example, the pipe blocking piece 3a' is a plug which is inserted into the inflow port 3a to block the inflow port 3a). Figure 4The equalizing pipes 3 pass through the through hole 122 at the bottom of the containing groove 1, and the bottom end of each equalizing pipe 3 extends from the bottom of the containing groove 1, and then the bottom end of each equalizing pipe 3 is in communication with each biochemical treatment unit one by one. In the embodiment, the number of the equalizing pipes 3 is preferably set according to the number of the biochemical pools 14 in the biochemical treatment unit, so that the number of the equalizing pipes 3 is not less than the number of the biochemical pools 14 in the biochemical treatment unit. For example, the equalizing pipes 3 can be set to 5 to 10, such as 6, 7, 8 or 9. In the embodiment, the number of the equalizing pipes 3 is preferably 8. Preferably, the equalizing pipe 3 comprises a horizontal pipe 321 and an equalizing pipe body 322b.

[0058] Optionally, the agricultural pollution distribution unit comprises the containing groove 1 and the inflow energy dissipation pipe 2. The inflow energy dissipation pipe 2 comprises a cylindrical pipe portion 21b and a circular truncated cone pipe portion 22b coaxially arranged. The circular truncated cone pipe portion 22b is located in the containing groove 1. The top end of the cylindrical pipe portion 21b has the same diameter as the smaller diameter end of the circular truncated cone pipe portion 22b, and the top end of the cylindrical pipe portion 21b is fixedly connected with the smaller diameter end of the circular truncated cone pipe portion 22b. The smaller diameter end of the circular truncated cone pipe portion 22b is located below the larger diameter end of the circular truncated cone pipe portion 22b. The bottom end of the cylindrical pipe portion 21b is a closed end. The raw water source and the sludge screening unit 5 are in communication with the cylindrical pipe portion 21b. In the embodiment, the dosing unit 7 is preferably in communication with the cylindrical pipe portion 21b. The bottom end of the cylindrical pipe portion 21b preferably penetrates the central hole 12 at the bottom of the containing groove 1. The raw water source and the sludge screening unit 5 are respectively in communication with two communication holes 21a at the bottom end of the cylindrical pipe portion 21b. In the embodiment, the pipe opening diameter of the cylindrical pipe portion 21b of the inflow energy dissipation pipe 2 is set to 2 to 3 times the pipe opening diameter under the rated treatment flow rate, so as to ensure that the maximum flow capacity can be 3 to 7 times the rated treatment flow rate. The circular truncated cone pipe portion 22b further ensures that the flow section gradually expands and the flow velocity gradually decreases under large flow capacity, so as to realize the inflow speed reduction operation and the gradually changing energy dissipation flow state.

[0059] Optionally, the agricultural pollution distribution unit comprises a plurality of equalizing pipes 3. The containing groove 1 is cylindrical. Each equalizing pipe 3 is uniformly distributed around the central axis of the containing groove 1. The inflow energy dissipation pipe 2 is coaxially arranged with the containing groove 1. Preferably, the inflow opening 3a of each equalizing pipe 3 is arranged towards the inflow energy dissipation pipe 2. This makes the positions of each equalizing pipe 3 relative to the containing groove 1 and the inflow energy dissipation pipe 2 relatively consistent, so that the mixture can be relatively evenly sent to each equalizing pipe 3, and the purpose of uniformly distributing the mixture to each biochemical pool 14 in the biochemical treatment unit is achieved. It can be understood that each biochemical pool 14 is a same specification biochemical pool 14 in series in the biochemical treatment unit.

[0060] Optionally, the agricultural waste distribution unit further comprises a plurality of partition plates 131 fixed to the inner wall of the accommodating groove 1, each of the partition plates 131 is uniformly distributed in the circumferential direction of the accommodating groove 1 and extends in the radial direction of the accommodating groove 1, and each of the uniform flow pipes 3 is arranged alternately with each of the partition plates 131 in the circumferential direction of the accommodating groove 1. That is, the number of the partition plates 131 is the same as the number of the uniform flow pipes 3, and one uniform flow pipe 3 is arranged between each two adjacent partition plates 131, so that each uniform flow pipe 3 is separated by each partition plate 131, the mutual interference between the fluid flowing to one uniform flow pipe 3 and the fluid flowing to another uniform flow pipe 3 is reduced, and then the fluid which has been relatively uniformly distributed to each uniform flow pipe 3 is not easy to impact each other again, and the uniform distribution of the fluid in the accommodating groove 1 to each uniform flow pipe 3 is formed again.

[0061] Optionally, the agricultural waste distribution unit further comprises a gas distribution assembly 4, the gas distribution assembly 4 comprises a gas flow scouring sediment source 43, an annular gas distribution pipe 41 located in the accommodating groove 1, and a plurality of radial gas distribution pipes 421 fixed to the annular gas distribution pipe 41, the annular gas distribution pipe 41 and the radial gas distribution pipes 421 are arranged at the bottom of the accommodating groove 1, the annular gas distribution pipe 41 is in communication with the gas flow scouring sediment source 43, the annular gas distribution pipe 41 is sleeved outside the inflow energy dissipation pipe 2, and the annular gas distribution pipe 41 is coaxially arranged with the inflow energy dissipation pipe 2, each of the radial gas distribution pipes 421 is located outside the annular gas distribution pipe 41, and the position of each of the radial gas distribution pipes 421 corresponds to the position of each of the uniform flow pipes 3. In this way, the suspended solids and / or impurities deposited at the bottom of the accommodating groove 1 for a long time can be regularly flushed and dredged by gas flow scouring, so as to improve the smoothness of the fluid flow channel in the accommodating groove 1 and effectively utilize the space. In the embodiment of the present application, the radial gas distribution pipe 421 corresponding to a uniform flow pipe 3 has a certain overlap with the partition plates 131 on both sides of the uniform flow pipe 3 in the radial direction of the accommodating groove 1, that is, the radial gas distribution pipe 421 extends into the space between the two partition plates 131, so that the radial gas distribution pipe 421 can send gas to the space between the two partition plates 131.

[0062] Optionally, the sludge feeding unit 6 comprises a discharge pipe 66, a sludge activation tank 60, a driving member, an activation gas source 64, an annular gas pipe 64a and a stirring member 65, the stirring member 65 and the annular gas pipe 64a are both arranged in the sludge activation tank 60, the driving member is in transmission connection with the stirring member 65, the activation gas source 64 is in communication with the annular gas pipe 64a, the annular gas pipe 64a is arranged at the bottom of the sludge activation tank 60, a plurality of gas holes are formed on the annular gas pipe 64a, the gas holes are uniformly distributed in the circumferential direction of the annular gas pipe 64a, a material collecting groove 60a is formed at the bottom of the sludge activation tank 60, a net barrier grid 66a is arranged at the groove opening of the material collecting groove 60a, and the discharge pipe 66 is in communication with the material collecting groove 60a.The sludge activation tank 60 is used to receive the inoculated sludge source from the external sewage treatment plant and to activate the sludge in the sludge activation tank 60. The storage volume of the sludge activation tank 60 is preferably 100-300 L. Tap water or clear liquid separated after biochemical purification in the self-biochemical treatment unit (i.e. treated water to achieve water-saving benefits) or raw water from the raw water intake facility point 80 (which is rich in endogenous substrate nutrients such as carbon, nitrogen and phosphorus and can also stimulate the starvation-rich food microbial conditioning mechanism of indigenous bacteria in the sludge source) can be used to hydrate and wet the over-thick sludge source with a solid content of 5%-20%. The sludge activation tank 60 is used to receive the liquid medicine from the medicine adding unit 7, the inoculated sludge source from the external sludge source 61, water supplemented from the external water source 62 and auxiliary materials 63, which include inorganic accelerated and settling aid carriers 631 (single components such as pomegranate fine sand, fine magnetic powder, fine clay, fly ash and powdered carbon, or a mixture of at least any two of pomegranate fine sand, fine magnetic powder, fine clay, fly ash and powdered carbon in a certain proportion) and polymer (one of PAM and PDM, or a mixture of PAM and PDM in a certain proportion) to prepare and mature the coagulation and flocculation liquid 632. The activation gas source 64 and the annular gas pipe 64a are used to aerate and oxygenate the sludge water and materials in the sludge activation tank 60, to activate the effective number and active quality of the dormant microorganisms (especially specific ammonification or nitrification AOB, NOB or phosphorus accumulation PAO bacteria) and to facilitate the rapid anabolic metabolism or filler biofilm formation of the sludge after entering the subsequent biochemical treatment unit (when the suspended filler is used to hold the activated sludge, i.e. IFAS process), to shorten the adaptation period of the biochemical treatment unit start-up inoculation and load cultivation, and to achieve gas source gas distribution and multiple use. The stirring member 65 and the activation gas source 64 are operated in time sequence alternately to achieve the A-O-A-O alternating activation condition of the inoculated sludge, which can activate the effective number and active quality of the original dormant microorganisms (especially facultative denitrifying bacteria or phosphorus releasing bacteria) in the inoculated sludge. The net barrier grid 66a is used to intercept the easily clogged impurities in the sludge and other mixed materials to prevent the easily clogged impurities from being input through the net barrier grid 66a to block the sludge selection screen unit 5. The net barrier grid 66a can be freely lifted from the sludge activation tank 60 for washing and maintenance and then restored to the original position. The sludge adding unit 6 also includes a hand push handle 67a on the upper side wall of the sludge activation tank 60 and a sliding universal wheel 67b (with a stop lock 67b1) at the bottom of the sludge activation tank 60, which can be temporarily slid or fixed to prevent the sludge activation tank 60 from running out of position when the sludge activation tank 60 is used. Various materials can be sent into the sludge activation tank 60 through the opening 61a at the top end of the sludge activation tank 60. The activated sludge is sent out of the sludge activation tank 60 through the discharge pipe 66, which includes a pipeline connected to the sludge activation tank 60 and a valve installed on the pipeline.

[0063] Optionally, the sludge screening unit 5 comprises a top flow pipe 534, a total feed pipe, a total bottom flow pipe 533 and a light-heavy flow vortex flow channeling separator 51, the light-heavy flow vortex flow channeling separator 51 having a feed port, a top flow outlet and a bottom flow outlet, the feed port preferably located at a sidewall of the light-heavy flow vortex flow channeling separator 51, the feed port arranged close to a top end of the light-heavy flow vortex flow channeling separator 51, one end of the total feed pipe connected to the feed port, the other end of the total feed pipe connected to the sludge feeding unit 6, the top flow pipe 534 connected to the top flow outlet, one end of the total bottom flow pipe 533 connected to the bottom flow outlet, the other end of the total bottom flow pipe 533 connected to the inflow energy dissipation pipe 2. The sludge screening unit 5 is used for screening activated sludge floc bacteria groups with good settling performance (to prevent sludge loss) from inoculated activated sludge, and the sludge screening unit 5 comprises an internal vortex flow channel structure, which is wide at the top and narrow at the bottom. The bottom flow sent out from the bottom flow outlet is a heavy density sludge water phase flow channel (downward flow settling sludge), and the top flow sent out from the top flow outlet is a relatively light density floating sludge scum phase flow channel (upward flow floating sludge), which is beneficial to the rapid settling and compression of the activated sludge phase layer, and is particularly beneficial to the rapid settling and compression of activated sludge phase layers with a relative density of 0.98-1.2 g / mL or a density slightly heavier than water. In the embodiment of the application, the light-heavy flow vortex flow channeling separator 51 is preferably a hydrocyclone; the total feed pipe is preferably connected to the discharge pipe 66 of the sludge feeding unit 6; and the top flow is sent to the light sludge collecting part 54 by the top flow pipe 534 for collection.

[0064] The sludge screening unit 5 further comprises a first sub-feeding pipe 531, a second sub-feeding pipe 532, a first sub-underflow pipe 533a, a second sub-underflow pipe 533b and a settling ratio measurer 52, the total feeding pipe is connected with the feeding port through the first sub-feeding pipe 531, the total feeding pipe is connected with the settling ratio measurer 52 through the second sub-feeding pipe 532, the total underflow pipe 533 is connected with the inflow energy dissipation pipe 2 through the first sub-underflow pipe 533a, the total underflow pipe 533 is connected with the settling ratio measurer 52 through the second sub-underflow pipe 533b, and valves are respectively arranged on the first sub-feeding pipe 531, the second sub-feeding pipe 532, the first sub-underflow pipe 533a and the second sub-underflow pipe 533b. In this way, after the sludge adding unit 6 is activated, the sludge enters the light-heavy vortex flow channel separator 51 through the first sub-feeding pipe 531 to perform cyclone separation (the heavy sludge flows out of the total underflow pipe 533, and the light sludge floats out of the top flow pipe 534, that is, the sludge is separated according to quality and flow, the heavy sludge is retained, and the light sludge is removed), or enters the settling ratio measurer 52 through the second sub-feeding pipe 532 (the excellent heavy sludge screened through the light-heavy vortex flow channel separator 51 can also pass through the second sub-underflow pipe 533b), and the volume of the settling ratio measurer 52 is 500 mL, 1 L or 2 L to evaluate whether the activated sludge settling ratio index before entering the next biochemical treatment unit is good (that is: SV 5min is lower than 85%, and SV 30min is lower than 50% and SV 60min are both lower than 40%).

[0065] In the embodiment of the present application, the settling ratio measurer 52 is preferably a transparent wall (which is beneficial to visual observation) straight cylinder gauge with a volume scale of 1-2 L, and the time is generally set as 5 min, 30 min or 60 min, that is, SV 5min , SV 30min and SV 60min , and a liquid discharge valve port 52c is arranged at the bottom of the settling ratio measurer 52; the valve on the first sub-feeding pipe 531 is valve 53a, the valve on the second sub-feeding pipe 532 is valve 52a, the valve on the first sub-underflow pipe 533a is valve 53b, and the valve on the second sub-underflow pipe 533b is valve 52b.

[0066] Optionally, the dosing unit 7 comprises a liquid calibration scale 73, a main pipeline 722, a series pipeline 721b, a plurality of storage barrels 71 and a plurality of parallel pipelines 721. The top end of the storage barrel 71 (or a storage container such as a medicine bag) is provided with a hook 71a. Each of the storage barrels 71 is connected to one of the parallel pipelines 721. Each of the parallel pipelines 721 is connected to the main pipeline 722. The main pipeline 722 is in communication with the liquid calibration scale 73. Each of the parallel pipelines 721 is provided with a parallel valve 721a. Each of the storage barrels 71 is connected in series through the series pipeline 721b. Each of the adjacent storage barrels 71 is provided with a series valve on the series pipeline 721b. The sludge distribution unit and the sludge dosing unit 6 are in communication with the liquid calibration scale 73. In the embodiment, the pipeline 741 and the pipeline 742 are connected in parallel to the pipeline 740. The pipeline 740 is in communication with the liquid calibration scale 73. The sludge distribution unit is in communication with the liquid calibration scale 73 through the pipeline 741. The sludge dosing unit 6 is in communication with the liquid calibration scale 73 through the pipeline 742. The pipeline 740 is provided with a valve 740a. The pipeline 741 is provided with a valve 741a. The pipeline 742 is provided with a valve 742a. The dosing unit 7 provides external liquid for the sludge distribution unit and the sludge dosing unit 6. The liquid can be an organic carbon source (acting as an organic carbon source nutrient food or as a denitrifying organic electron donor) or an iron (or aluminum) salt coagulation liquid (sludge electric neutralization and coagulation). In the embodiment, the storage barrel 71 is preferably detachable. The empty barrel is filled with liquid at another place and then transported to the agricultural pollution site for replacement of the empty storage barrel 71. The storage barrel 71 can also be provided with a gas flow vibration pipe component (provided with a common gas source output power component) to prevent the liquid from solidifying at the bottom. The series pipeline 721b and the parallel pipeline 721 can be connected in parallel or in series to meet the storage and dosing operation period of 3-10 days in the agricultural pollution small treatment station. The liquid calibration scale 73 can be used to adjust the flow rate of the main pipeline 722 by manual adjustment. In the embodiment, the parallel valve 721a and the series valve can be flow control clamps (control switches and micro-flow clamps). The storage barrel 71 and the liquid calibration scale 73 are relatively transparent for visual observation.

[0067] The administration unit 7 also includes a safety cover 75, which has the function of preventing theft and unauthorized personnel from contacting the medicine, and prevents the medicine barrel 71 from being stolen or touched by unauthorized personnel. The safety cover 75 is provided with a box door cover 751 (including upper and lower ends and a side wall box), a transparent observation window, a theft-proof lock 753, and a lifting lug 754. The transparent observation window and the theft-proof lock 753 are both nested with the box door cover 751, and the transparent observation window includes a medicine barrel observation area 752a and a scale observation area 752b. The medicine barrel observation area 752a is used for visual window observation of the remaining amount in the medicine barrel 71, and the scale observation area 752b is used for visual window observation of the scale of the liquid medicine scale 73. The lifting lug 754 is provided on the inside of the upper end of the box door cover 751, and is used to fasten the hook at the top of the medicine barrel 71. The safety cover 75 is provided with a buried fixing bolt 75a.

[0068] In the embodiment of the present application, the agricultural pollution distribution system further comprises an inflow regulating component and a discharge component. The inflow regulating component 8 comprises a raw water intake facility point 80, a raw water input pipe 81, a main inflow pipe 82, and a backflow pipe 83. The raw water intake facility point 80 is generally a pretreatment section regulating pool or a booster pump house of an agricultural pollution treatment station, the raw water input pipe 81 can adopt pressure flow or gravity flow, the main inflow pipe 82 is provided with a flow meter 8a and a valve 8b, and the backflow pipe 83 is provided with a valve 8c for regulating the backflow of water. By adjusting the opening degrees of the valves 8b and 8c and observing the flow meter 8a, the distribution of the water to be treated from the main inflow pipe 82 into the inflow energy dissipation pipe 2 and the biochemical pool 14 can be flexibly regulated.

[0069] The discharge component 9 (provided with pipes and valves) is in communication with the lower bottom of the containing tank 1, can perform emergency discharge of the mixed flow liquid in the inner cavity of the containing tank 1, or serve as a channel for discharging the backwash liquid when the gas distribution assembly 4 is started to flush and remove silt, and is in communication with the backflow pipe 83, so as to return the discharged liquid to the raw water intake facility point 80, preventing sewage overflow.

[0070] As shown in Figure 14 In order to further make the inflow of each biochemical pool relatively uniform, and to improve the problems of great uneven distribution of the treatment water load and the pollutant load between the series of biochemical pools, frequent instability of biochemical operation conditions, low pollutant purification removal rate of the effluent of the biochemical treatment unit, extensive and difficult-to-control operation energy consumption and material consumption, poor water distribution, mud distribution, and medicine distribution effect, and insufficient impact resistance of the biochemical system in terms of water quantity and water quality, another aspect of the present application provides a control method of an agricultural pollution distribution system, which is implemented by using the agricultural pollution distribution system provided in the embodiment of the present application. The method comprises the following steps:

[0071] Step 010: Real-time acquisition of the weight value of the sludge in the sludge feeding unit;

[0072] Step 020: if the current sludge weight value is equal to or greater than the preset material weight value (preferably, the preset weight value is: the total effective tank capacity of all series of the biochemical tank 14 x the sludge amount coefficient k / pollution sludge moisture content, wherein k is preferably 2.0-3.5 kg / m 3 Tank capacity);

[0073] Step 030: control the dosing unit to add liquid medicine to the sludge dosing unit, and control the sludge dosing unit to activate the sludge in the sludge dosing unit, and send the sludge to the sludge screening unit;

[0074] Step 040: control the sludge screening unit to separate the sludge into light sludge and heavy sludge, and send the heavy sludge to the agricultural pollution distribution unit.

[0075] It can be understood that the sludge dosing unit includes a sludge activation tank, a driving member, an activation gas source, and a stirring member, the sludge activation tank is used to hold sludge, the driving member is used to drive the stirring member to stir the sludge in the sludge activation tank, and the activation gas source is used to aeration in the sludge activation tank; the sludge screening unit includes a light and heavy flow vortex flow channel separator and a settling ratio measurer;

[0076] Correspondingly, step 030 can further include step 031: controlling the driving member and the activation gas source to start alternately;

[0077] And / or, step 030 can further include step 032:

[0078] send the sludge to the light and heavy flow vortex flow channel separator and the settling ratio measurer respectively,

[0079] while controlling the light and heavy flow vortex flow channel separator to separate the sludge into light sludge and heavy sludge, obtain the primary sludge settling ratio and the primary density value of the sludge in the settling ratio measurer,

[0080] control the settling ratio measurer to be empty, and send part of the heavy sludge separated by the light and heavy flow vortex flow channel separator to the settling ratio measurer, obtain the secondary sludge settling ratio and the secondary density value of the sludge in the settling ratio measurer,

[0081] compare the primary sludge settling ratio with the secondary sludge settling ratio, and compare the primary density value with the secondary density value, and obtain data (specifically, obtain sludge screening effectiveness data).

[0082] It can be understood that the settling ratio measuring device is provided with a density meter (not shown) for measuring the density value of the liquid phase; when the primary sludge settling ratio and the primary density value of the sludge in the settling ratio measuring device are obtained, the 5-30 min sludge settling ratio and the density value of the activated primary sludge are observed and recorded; and when the secondary sludge settling ratio and the secondary density value of the sludge in the settling ratio measuring device are obtained, the 5-30 min sludge settling ratio and the density value of the activated primary sludge are observed and recorded.

[0083] In order to further make the inflow of each biochemical tank relatively uniform, after step 040, the following steps are further included:

[0084] Step 050: processing flow distribution inflow procedure: start the inflow regulating component 8, and adjust the matching processing flow of the inflow energy dissipation pipe 2 by frequency conversion of the pump at the raw water intake facility point 80, or by fine adjustment of the opening degree of the valve 8b and / or the valve 8c, and simultaneously start the pipeline 741 of the dosing unit 7, and uniformly distribute the flow to each series of biochemical tanks 14 of the biochemical treatment unit through each flow distribution pipe 3 in the holding tank 1.

[0085] Step 060: regular scouring procedure: start the air distribution assembly, i.e., open the air scouring gas source 43 to perform air scouring on the inner bottom of the holding tank 1, and then open the air release component 9 to perform dirty liquid discharge collection, thereby forming the system working method of “activation-selection-flow distribution-dosing-scouring”.

[0086] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An agricultural pollutant distribution system, characterized by, The agricultural wastewater distribution unit, the sludge adding unit, the sludge screening unit and the dosing unit are communicated with the dosing unit, and the sludge adding unit, the sludge screening unit and the agricultural wastewater distribution unit are communicated in sequence. The sludge screening unit is used for receiving sludge sent from the sludge adding unit and separating heavy sludge in the sludge. The agricultural wastewater distribution unit is used for receiving raw water, liquid medicine sent from the dosing unit and heavy sludge sent from the sludge screening unit. The agricultural wastewater distribution unit is used for distributing the mixture of the raw water, the liquid medicine and the heavy sludge to a plurality of biochemical pools of a biochemical treatment unit. The agricultural wastewater distribution unit comprises a containing groove and an inflow energy dissipation pipe, the inflow energy dissipation pipe comprises a cylindrical pipe part and a circular truncated cone pipe part arranged coaxially, the circular truncated cone pipe part is located in the containing groove, the top end of the cylindrical pipe part is the same in diameter as the smaller-diameter end of the circular truncated cone pipe part, and the top end of the cylindrical pipe part is fixedly connected with the smaller-diameter end of the circular truncated cone pipe part, the smaller-diameter end of the circular truncated cone pipe part is located below the larger-diameter end of the circular truncated cone pipe part, and the bottom end of the cylindrical pipe part is a closed end, and the raw water source and the sludge screening unit are communicated with the cylindrical pipe part. The agricultural wastewater distribution unit comprises a plurality of flow uniformizing pipes, the containing groove is cylindrical, the flow uniformizing pipes are uniformly distributed around the central axis of the containing groove, and the inflow energy dissipation pipe is arranged coaxially with the containing groove. The agricultural wastewater distribution unit further comprises a plurality of partition plates uniformly fixed to the inner wall of the containing groove, the partition plates are uniformly distributed in the circumferential direction of the containing groove, and the partition plates extend in the radial direction of the containing groove, and the flow uniformizing pipes and the partition plates are alternately arranged in the circumferential direction of the containing groove.

2. The agricultural pollutant distribution system of claim 1, wherein, The agricultural wastewater distribution unit further comprises a gas distribution assembly, the gas distribution assembly comprises a gas flow scouring and depositing gas source, an annular gas distribution pipe located in the containing groove and a plurality of radial gas distribution pipes fixed to the annular gas distribution pipe, the annular gas distribution pipe and the radial gas distribution pipes are arranged at the bottom of the containing groove, the annular gas distribution pipe is communicated with the gas flow scouring and depositing gas source, the annular gas distribution pipe is sleeved outside the inflow energy dissipation pipe, the annular gas distribution pipe is arranged coaxially with the inflow energy dissipation pipe, the radial gas distribution pipes are located outside the annular gas distribution pipe, and the positions of the radial gas distribution pipes correspond to the positions of the flow uniformizing pipes one by one.

3. The agricultural pollutant distribution system of claim 1 or 2, wherein, The sludge adding unit comprises a discharge pipe, a sludge activation tank, a driving member, an activation gas source, an annular gas pipe and a stirring member, the stirring member and the annular gas pipe are arranged in the sludge activation tank, the driving member is in transmission connection with the stirring member, the activation gas source is communicated with the annular gas pipe, the annular gas pipe is arranged at the bottom of the sludge activation tank, a plurality of gas holes are formed in the annular gas pipe, the gas holes are uniformly distributed in the circumferential direction of the annular gas pipe, a material collecting groove is formed at the bottom of the sludge activation tank, a mesh barrier is arranged at the groove opening of the material collecting groove, and the discharge pipe is communicated with the material collecting groove.

4. The agricultural pollutant distribution system of claim 1 or 2, wherein, The sludge screening unit comprises a top flow pipe, a total feed pipe, a total bottom flow pipe and a light-heavy flow vortex flow channeling separator, the light-heavy flow vortex flow channeling separator has a feed port, a top flow outlet and a bottom flow outlet, one end of the total feed pipe is connected to the feed port, the other end of the total feed pipe is connected to the sludge feeding unit, the top flow pipe is connected to the top flow outlet, one end of the total bottom flow pipe is connected to the bottom flow outlet, and the other end of the total bottom flow pipe is connected to an inflow energy dissipation pipe.

5. The agricultural pollutant distribution system of claim 4, wherein, The sludge screening unit further comprises a first sub-feed pipe, a second sub-feed pipe, a first sub-bottom flow pipe, a second sub-bottom flow pipe and a settling ratio measurer, the total feed pipe is connected to the feed port through the first sub-feed pipe, the total feed pipe is connected to the settling ratio measurer through the second sub-feed pipe, the total bottom flow pipe is connected to the inflow energy dissipation pipe through the first sub-bottom flow pipe, the total bottom flow pipe is connected to the settling ratio measurer through the second sub-bottom flow pipe, and valves are respectively arranged on the first sub-feed pipe, the second sub-feed pipe, the first sub-bottom flow pipe and the second sub-bottom flow pipe.

6. The agricultural pollutant distribution system of claim 1 or 2, wherein, The dosing unit comprises a liquid medicine calibration scale, a main pipeline, a series pipeline, a plurality of medicine storage barrels and a plurality of parallel pipelines, each of the medicine storage barrels is connected to one of the parallel pipelines in one-to-one correspondence, each of the parallel pipelines is connected to the main pipeline, the main pipeline is in communication with the liquid medicine calibration scale, a parallel valve is arranged on each of the parallel pipelines, each of the medicine storage barrels is connected in series through the series pipeline, a series valve is arranged between each of the adjacent medicine storage barrels on the series pipeline, and the sludge distribution unit and the sludge feeding unit are in communication with the liquid medicine calibration scale.

7. A control method of an agricultural pollutant distribution system, characterized by, The application of the agricultural pollution distribution system according to any one of claims 1 to 6 is realized, and the method comprises: real-time acquisition of a sludge weight value in the sludge feeding unit; if it is detected that the current sludge weight value is equal to or greater than a preset material weight value, controlling the dosing unit to add liquid medicine into the sludge feeding unit, controlling the sludge feeding unit to activate the sludge in the sludge feeding unit, and sending the sludge to the sludge screening unit, controlling the sludge screening unit to separate the sludge into light sludge and heavy sludge, and sending the heavy sludge to the agricultural pollution distribution unit.

8. The control method of the agricultural chemical distribution system according to claim 7, characterized by The sludge feeding unit comprises a sludge activation tank, a driving member, an activation gas source and a stirring member, the sludge activation tank is used for containing sludge, the driving member is used for driving the stirring member to stir the sludge in the sludge activation tank, and the activation gas source is used for aeration in the sludge activation tank; and the sludge screening unit comprises a light-heavy flow vortex flow channeling separator and a settling ratio measurer. Correspondingly, the control of the sludge feeding unit to activate the sludge in the sludge feeding unit comprises: alternatingly starting the driving member and the activation gas source. And / or, the sending of the sludge to the sludge screening unit comprises: sending the sludge to the light-heavy flow vortex flow channeling separator and the settling ratio measurer, respectively, In the control of the light-heavy flow vortex flow channeling separator separating the sludge into light sludge and heavy sludge, the primary sludge settling ratio and the primary density value of the sludge in the settling ratio measurer are obtained, The settling ratio measurer is controlled to be emptied, and the part of the heavy sludge separated by the light-heavy flow vortex flow channeling separator is sent to the settling ratio measurer, the secondary sludge settling ratio and the secondary density value of the sludge in the settling ratio measurer are obtained, The primary sludge settling ratio is compared with the secondary sludge settling ratio, and the primary density value is compared with the secondary density value, and data is obtained.

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