Carbon source feeding system for anoxic tank

Abstract

The utility model discloses a carbon source feeding system for an anoxic tank, which is characterized in that a plurality of carbon source feeding devices are uniformly arranged on two wall surfaces of the anoxic tank, which are vertical to the water inlet and outlet direction, in two rows, and the number of the two rows of carbon source feeding devices is equal; the carbon source feeding devices at the two ends keep a preset interval with the water inlet and outlet wall surface of the anoxic tank; each carbon source adding device is connected with the carbon source diluting device through a pipeline, and a carbon source can be provided by the carbon source diluting device; all the carbon source adding devices and the carbon source diluting device are in communication connection with an instrument control unit, and the instrument control unit can control the carbon source diluting device and all the carbon source adding devices to add carbon sources into the anoxic tank according to preset flow. A plurality of carbon source adding devices are uniformly arranged on two wall surfaces, perpendicular to the water inlet and outlet direction, of the anoxic tank in two rows, and are matched with a carbon source diluting device, so that the contact area of a carbon source and sewage in the anoxic tank is increased, the mass transfer efficiency of an external carbon source is improved, and the waste of the carbon source is reduced.

Description

Technical Field

[0001] The utility model relates to the field of sewage treatment facilities, in particular to a carbon source dosing system for anoxic pools. Background Art

[0002] At present, most urban sewage treatment plants use biological nitrification and denitrification processes to remove total nitrogen. In aerobic tanks, ammonia nitrogen is converted into nitrate nitrogen through nitrification, and in anoxic tanks, nitrate nitrogen is converted into nitrogen gas through denitrification, using carbon as an electron donor and nitrate nitrogen as an electron acceptor, thereby achieving sewage denitrification. The available carbon source in raw water is often not high, the carbon-nitrogen ratio is low, and the carbon source required for denitrification is insufficient, which affects the sewage denitrification effect. Supplementing external carbon sources has become the main method to solve the problem of total nitrogen compliance in urban sewage treatment plants. Commonly used external carbon sources are methanol, sodium acetate, glucose, new carbon sources, etc.

[0003] Due to the limitation of transportation cost, a considerable part of the external carbon sources currently used in sewage treatment plants are solid powders or concentrated solutions of carbon sources with high COD equivalent. Some sewage treatment plants directly put solid carbon sources or concentrated solutions of carbon sources with high COD equivalent into the anoxic tank. Although the anoxic tank is equipped with mixing facilities such as agitators and flow pushers for mixing sewage and carbon sources, the dissolution and dispersion of the reagents require a certain amount of time, which reduces the effective denitrification time and affects the denitrification effect. Single-point addition exacerbates the uneven distribution of carbon sources in the anoxic tank. When the COD equivalent is very high, the effective contact area between the carbon source and the sewage is small, the mass transfer effect of the carbon source is poor, the utilization rate is low, and the denitrification effect is not ideal. In addition, some on-site manual handling of solid reagents is very labor-intensive.

[0004] At present, most sewage treatment plants adopt the method of adding a constant amount of external carbon sources or adding a large amount in batches, without fully considering the real-time fluctuations in the amount of water and water quality of the sewage treatment plants. There may be a mismatch between the demand and the amount added. When the carbon source dosage is insufficient, there is a risk of exceeding the TN standard in the effluent. When the carbon source dosage is excessive, there will be a waste of reagents, the effluent COD will exceed the standard, and the energy consumption of aerobic aeration will increase.

[0005] In view of this, the present utility model is proposed. Utility Model Content

[0006] The purpose of the utility model is to provide a carbon source dosing system for anoxic pools, which can realize intelligent and efficient dosing of carbon sources in anoxic pools, match the carbon source demand with the carbon source dosage, meet the sewage treatment requirements, avoid waste of reagents and energy consumption, and thus solve the above-mentioned technical problems existing in the prior art.

[0007] The purpose of this utility model is achieved through the following technical solutions:

[0008] A carbon source dosing system for anoxic pools, comprising:

[0009] Multiple carbon source dosing devices, carbon source dilution devices and instrument control units; among which,

[0010] A plurality of carbon source dosing devices are evenly arranged in two rows on two walls of the anoxic tank that are perpendicular to the inlet and outlet directions, and the number of carbon source dosing devices in the two rows is equal; the carbon source dosing devices at both ends maintain a predetermined interval with the inlet and outlet walls of the anoxic tank;

[0011] Each carbon source adding device is connected to the carbon source dilution device through a pipeline, and can be provided with a carbon source by the carbon source dilution device;

[0012] Each carbon source adding device and the carbon source dilution device are connected to the instrument control unit for communication, and the instrument control unit can control the carbon source dilution device and each carbon source adding device to add carbon source into the anoxic tank at a predetermined flow rate.

[0013] Compared with the prior art, the carbon source dosing system for anoxic pools provided by the utility model has the following beneficial effects:

[0014] By evenly arranging multiple carbon source dosing devices in two rows on two walls of the anoxic tank that are perpendicular to the inlet and outlet directions, and cooperating with the carbon source dilution device, the contact area between the carbon source and sewage in the anoxic tank is increased, the mass transfer efficiency of the external carbon source is improved, and the denitrification effect of the anoxic tank is improved; the carbon source dosing devices arranged in this way can also make full use of the carbon source in the original sewage, reduce the amount of carbon source used, and greatly weaken the effect of high-concentration dissolved oxygen in the reflux nitrification liquid on denitrification; the instrument control unit is used to intelligently and accurately adjust the carbon source dosage according to the online instrument signal in the anoxic tank, and a mass flowmeter is set to measure the carbon source flow, accurately measure the carbon source dosage, and reduce carbon source waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 A schematic diagram of the structure of a carbon source dosing system for anoxic pools provided in an embodiment of the utility model.

[0017] Figure 2 A schematic diagram of the arrangement of a dosing device of a carbon source dosing system provided in an embodiment of the utility model.

[0018] Figure 3 The structural principle of a single dosing device of the carbon source dosing system provided in the embodiment of the utility model Figure 1 .

[0019] Figure 4 The structural principle of a single dosing device of the carbon source dosing system provided by the embodiment of the utility model Figure 2 .

[0020] Figure 5 A schematic structural diagram of a flow guide device of a carbon source dosing system provided in an embodiment of the utility model.

[0021] Figure 6 A schematic diagram of a storage and dilution unit of a carbon source dosing system provided in an embodiment of the utility model.

[0022] Figure 7 This is a schematic diagram of the instrument and control unit of the carbon source dosing system provided in an embodiment of the utility model.

[0023] The marks in the figure are:

[0024] Figure 1 Middle: 1-carbon source dosing device; 10-carbon source dilution device; 36-instrument and control unit; A-anoxic tank; B-aerobic tank; C-agitator; D-water inlet pipe of anoxic tank; E-sludge return pipe of anoxic tank; F-nitrification liquid return pipe of anoxic tank; G-water outlet pipe of aerobic tank;

[0025] Figure 2 Middle: 6- diversion device;

[0026] Figure 3 Middle: 2-first ball valve; 3-first mass flow meter; 4-flow regulating valve; 5-maintenance bypass valve; 6-flow guide device; A-anoxic tank;

[0027] Figure 4 Middle: 6- diversion device; A- anoxic tank;

[0028] Figure 5 Middle: 7-drug baffle; 8-flow guide groove; 9-flow guide hole;

[0029] Figure 6 In: 11-carbon source storage tank; 12-carbon source metering pump; 13-second mass flow meter; 14-tap water tank; 15-tap water metering pump; 16-third mass flow meter; 17-mixing device; 18-second ball valve; 19-Y-type filter; 20-third ball valve; 21-branch safety valve; 22-fourth ball valve; 23-pulsation damper; 24-back pressure valve; 25-fifth ball valve; 26-sixth ball valve; 27-first bypass valve; 28-seventh ball valve; 29-eighth ball valve; 30-pressure gauge; 31-check valve; 32-ninth ball valve; 33-tenth ball valve; 34-eleventh ball valve; 35-second bypass valve;

[0030] Figure 7In: 38-first electromagnetic flowmeter; 39-first online COD meter; 40-first online ammonia nitrogen meter; 41-second electromagnetic flowmeter; 42-first online nitrate nitrogen meter; 43-third electromagnetic flowmeter; 44-second online nitrate nitrogen meter; 45-online ORP meter; 46-first online dissolved oxygen meter; 47-online temperature meter; 48-third online nitrate nitrogen meter; 49-second online ammonia nitrogen meter; 50-second online COD meter; 51-second online dissolved oxygen meter; A-anoxic tank; B-aerobic tank; C-agitator; D-water inlet pipe of anoxic tank; E-sludge return pipe of anoxic tank; F-nitrification liquid return pipe of anoxic tank; G-outlet pipe of aerobic tank; DETAILED DESCRIPTION

[0031] The following is a clear and complete description of the technical solutions in the embodiments of the utility model in conjunction with the drawings in the embodiments of the utility model; it is obvious that the described embodiments are only part of the embodiments of the utility model, not all of the embodiments, which does not constitute a limitation of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the utility model.

[0032] First, the terms that may be used in this article are explained as follows:

[0033] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0034] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0035] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0036] Unless otherwise specified or 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 connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0037] When concentration, temperature, pressure, size or other parameters are expressed in the form of a numerical range, the numerical range should be understood to specifically disclose all ranges formed by the pairing of any upper limit, lower limit, and preferred value in the numerical range, regardless of whether the range is explicitly stated; for example, if a numerical range of "2 to 8" is stated, the numerical range should be interpreted as including ranges such as "2 to 7", "2 to 6", "5 to 7", "3 to 4 and 6 to 7", "3 to 5 and 7", "2 and 5 to 7", etc. Unless otherwise specified, the numerical ranges stated herein include both their end values ​​and all integers and fractions within the numerical range.

[0038] The orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings and are only for the convenience and simplification of description, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of this document.

[0039] The scheme provided by the utility model is described in detail below. The contents not described in detail in the embodiments of the utility model belong to the prior art known to professional and technical personnel in the field. If no specific conditions are specified in the embodiments of the utility model, the conditions are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturers of the reagents or instruments used in the embodiments of the utility model are not specified, they are all conventional products that can be purchased commercially.

[0040] like Figure 1 , Figure 2 As shown, the embodiment of the utility model provides a carbon source dosing system for anoxic pools, comprising:

[0041] Multiple carbon source dosing devices, carbon source dilution devices and instrument control units; among which,

[0042] A plurality of carbon source dosing devices are evenly arranged in two rows on two walls of the anoxic tank that are perpendicular to the inlet and outlet directions, and the number of carbon source dosing devices in the two rows is equal; the carbon source dosing devices at both ends maintain a predetermined interval with the inlet and outlet walls of the anoxic tank;

[0043] Each carbon source adding device is connected to the carbon source dilution device through a pipeline, and can be provided with a carbon source by the carbon source dilution device;

[0044] Each carbon source adding device and the carbon source dilution device are connected to the instrument control unit for communication, and the instrument control unit can control the carbon source dilution device and each carbon source adding device to add carbon source into the anoxic tank at a predetermined flow rate.

[0045] like Figure 3 , Figure 4 As shown, preferably, in the above system, each carbon source dosing device has the same structure, including:

[0046] Liquid inlet pipeline, first ball valve, first mass flow meter, flow regulating valve, maintenance bypass valve and flow guide device; wherein,

[0047] The liquid inlet pipeline is provided with a first ball valve, a first mass flow meter and a flow regulating valve in sequence;

[0048] The inspection bypass valve is connected in parallel to the pipelines at both ends of the first ball valve, the first mass flow meter and the flow regulating valve through a bypass pipeline;

[0049] The liquid outlet end of the liquid inlet pipeline is located in the anoxic pool, and the flow guide device is arranged on the liquid outlet end.

[0050] like Figure 5 As shown, preferably, in the above system, the flow guide device includes: a drug baffle, a flow guide groove and a plurality of flow guide holes; wherein,

[0051] A medicine baffle is provided at the inlet end of the flow guide device;

[0052] A guide groove is arranged at the outlet end of the guide device, a plurality of guide holes are arranged in the guide groove, and each guide hole is communicated with the inlet end of the guide device.

[0053] Preferably, in the above system, the number of the guide holes is 7, the 7 guide holes are arranged in a row on the guide groove, and the diameter of each guide hole is 4 mm.

[0054] like Figure 6 As shown, preferably, in the above system, the carbon source dilution device comprises:

[0055] A carbon source supply component, a tap water supply component and a mixing device; wherein,

[0056] The outlet end of the carbon source supply assembly is connected to an inlet of the mixing device;

[0057] The outlet end of the tap water supply assembly is connected to another inlet of the mixing device;

[0058] The carbon source outlet end of the mixing device is used to connect to each carbon source adding device, and can transport the mixed carbon source and tap water to each carbon source adding device.

[0059] See also Figure 6 Preferably, in the above system, the carbon source supply component comprises:

[0060] Carbon source storage tank, second ball valve, Y-type filter, two third ball valves, two carbon source metering pumps, two branch safety valves, two fourth ball valves, pulsation damper, back pressure valve, fifth ball valve, second mass flow meter, sixth ball valve and first bypass valve; wherein,

[0061] The outlet of the carbon source storage tank is connected to the second ball valve and the Y-type filter in sequence, the outlet of the Y-type filter is divided into two carbon source outlets, each of which is connected to a third ball valve, a carbon source metering pump, one end of a branch safety valve and a fourth ball valve in sequence, and the two carbon source outlets are connected to a pulsation damper, a back pressure valve, a fifth ball valve, a second mass flow meter and a sixth ball valve in sequence after being combined, and are connected to an inlet of the mixing device through the sixth ball valve;

[0062] Both ends of the pipeline where the fifth ball valve, the second mass flow meter and the sixth ball valve are located are connected to the first bypass valve through a parallel pipeline;

[0063] The other end of the branch safety valve is back-connected to the carbon source storage tank.

[0064] See also Figure 6 Preferably, in the above system, the tap water supply component comprises:

[0065] A tap water tank, a seventh ball valve, two eighth ball valves, two tap water metering pumps, two pressure gauges, two check valves, two ninth ball valves, a tenth ball valve, a third mass flow meter and an eleventh ball valve; wherein,

[0066] The outlet pipeline of the tap water tank is connected to the seventh ball valve and is divided into two tap water outlets, each of which is connected to an eighth ball valve, a tap water metering pump, a pressure gauge, a check valve and a ninth ball valve in sequence;

[0067] The two tap water outlets are connected in sequence to the tenth ball valve, the third mass flow meter and the eleventh ball valve after being combined, and are connected to another inlet of the mixing device through the eleventh ball valve;

[0068] Both ends of the pipeline where the tenth ball valve, the third mass flowmeter and the eleventh ball valve are located are connected to the second bypass valve through a parallel pipeline.

[0069] like Figure 7 As shown, preferably, in the above system, the instrument control unit includes:

[0070] A first electromagnetic flowmeter 38, a first online COD meter 39, a first online ammonia nitrogen meter 40, a second electromagnetic flowmeter 41, a first online nitrate nitrogen meter 42, a third electromagnetic flowmeter 43, a second online nitrate nitrogen meter 44, an online ORP meter 45, a first online dissolved oxygen meter 46, an online temperature meter 47, a third online nitrate nitrogen meter 48, a second online ammonia nitrogen meter 49, a second online COD meter 50, a second online dissolved oxygen meter 51 and a control cabinet 37; wherein,

[0071] The first electromagnetic flowmeter 38, the first online COD meter 39 and the first online ammonia nitrogen meter 40 are all arranged on the water inlet pipe of the anoxic tank;

[0072] The second electromagnetic flowmeter 41 and the first online nitric nitrogen meter 42 are both arranged on the nitrification liquid reflux pipe of the anoxic tank;

[0073] The third electromagnetic flowmeter 43 and the second online nitric nitrogen meter 44 are both arranged on the sludge return pipe of the anoxic tank;

[0074] The online ORP meter 45, the first online dissolved oxygen meter 46 and the online temperature meter 47 are all arranged in the middle section of the anoxic tank;

[0075] The third online nitric nitrogen meter 48, the second online ammonia nitrogen meter 49, the second online COD meter 50 and the second online dissolved oxygen meter 51 are all arranged at the end of the anoxic tank;

[0076] The control cabinet is electrically connected to the first electromagnetic flowmeter 38, the first online COD meter 39, the first online ammonia nitrogen meter 40, the second electromagnetic flowmeter 41, the first online nitrate nitrogen meter 42, the third electromagnetic flowmeter 43, the second online nitrate nitrogen meter 44, the online ORP meter 45, the first online dissolved oxygen meter 46, the online temperature meter 47, the third online nitrate nitrogen meter 48, the second online ammonia nitrogen meter 49, the second online COD meter 50, the second online dissolved oxygen meter 51 and the carbon source dilution device, respectively, and can control the carbon source flow rate and the tap water flow rate of the carbon source dilution device according to the data of the first electromagnetic flowmeter and the first online COD meter on the water inlet pipe, the data of the second electromagnetic flowmeter 41 and the first online nitrate nitrogen meter 42 on the nitrification liquid reflux pipe, the data of the third electromagnetic flowmeter 43 and the second online nitrate nitrogen meter 44 on the sludge reflux pipe, and in combination with the data of the third online nitrate nitrogen meter 48, the second online ammonia nitrogen meter 49 and the second online COD meter 50 at the end of the anoxic tank, and adjust the carbon source dosage once according to the predetermined time period.

[0077] In summary, it can be seen that the carbon source dosing system of the embodiment of the utility model increases the contact area between the carbon source and the sewage in the anoxic tank by evenly arranging a plurality of carbon source dosing devices in two rows on the two walls of the anoxic tank that are perpendicular to the inlet and outlet directions, and cooperates with the carbon source dilution device, thereby improving the mass transfer efficiency of the external carbon source and the denitrification effect of the anoxic tank; the carbon source dosing device arranged in this way can also make full use of the carbon source in the original sewage, reduce the amount of carbon source used, and greatly weaken the effect of high-concentration dissolved oxygen in the reflux nitrification liquid on denitrification; the instrument control unit is used to intelligently and accurately adjust the carbon source dosage according to the online instrument signal in the anoxic tank, and a mass flowmeter is set to measure the carbon source flow, accurately measure the carbon source dosage, and reduce carbon source waste.

[0078] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the solution provided by the embodiments of the present invention is described in detail with specific embodiments below.

[0079] Example 1

[0080] like Figure 1 , Figure 2 As shown, an embodiment of the utility model provides a carbon source dosing system for anoxic pools. The system can be used in the field of sewage purification for dosing carbon sources in anoxic pools. It integrates the functions of reagent storage, dilution and dosing, has a high degree of automation, low labor intensity, and a small amount of carbon source, and can achieve the purpose of energy saving and consumption reduction.

[0081] The carbon source dosing system is used in the following sewage treatment system. The sewage raw water and the return nitrification liquid and return sludge are mixed at the front end of the anoxic tank. Two submersible mixers are arranged in the anoxic tank. The anoxic tank outlet is set at the end of the anoxic tank in the diagonal direction of the inlet.

[0082] The carbon source dosing system comprises: six groups of carbon source dosing devices 1, a carbon source dilution device 10 and an instrument control unit 36; wherein,

[0083] Six groups of carbon source dosing devices are arranged on the wall of the anoxic pool A perpendicular to the inlet and outlet directions. The six groups of carbon source dosing devices are evenly arranged in two rows. The carbon source dosing devices 1 at both ends are 4 to 5 meters away from the inlet and outlet walls of the anoxic pool A. The outlet of each group of carbon source dosing devices 1 is located below the liquid surface and is provided with a guide device 6, which is conducive to the migration and diffusion of the carbon source toward the center of the anoxic pool A, increasing the effective contact area between the carbon source and the sewage. Figure 3 , Figure 4, each group of carbon source dosing device 1 is provided with a first ball valve 2, a first mass flow meter 3, a flow regulating valve 4, a maintenance bypass valve 5 and a diversion device 6. From the water inlet to the water outlet of the anoxic pool, the dosing ratio of the first 4 groups of carbon source dosing devices is 20% to 30%, and the dosing ratio of the last 2 groups of carbon source dosing devices is 5% to 10%. The diversion device 6 is connected to the center of the anoxic pool. A diversion device 6 is provided at the outlet of each group of carbon source dosing device 1. A drug baffle 7, a diversion groove 8 and a plurality of diversion holes 9 are provided at the outlet of the diversion device 6. The diameter of each diversion hole 9 is 3 to 5 mm, see Figure 5 .

[0084] See also Figure 6 The carbon source dilution device 10 includes: a carbon source supply component, a tap water supply component and a mixing device 17; wherein,

[0085] The outlet end of the carbon source supply assembly is connected to an inlet of the mixing device 17;

[0086] The outlet end of the tap water supply assembly is connected to another inlet of the mixing device 17;

[0087] The carbon source outlet end of the mixing device 17 is used to connect to each carbon source dosing device 1 , and can transport the mixed carbon source and tap water to each carbon source dosing device 1 .

[0088] Wherein, the carbon source supply assembly comprises:

[0089] Carbon source storage tank 11, second ball valve 18, Y-type filter 19, two third ball valves 20, two carbon source metering pumps 12, two branch safety valves 21, two fourth ball valves 22, pulsation damper 23, back pressure valve 24, fifth ball valve 25, second mass flow meter 13, sixth ball valve 26 and first bypass valve 27; wherein,

[0090] The outlet of the carbon source storage tank 11 is connected to the second ball valve 18 and the Y-type filter 19 in sequence. The outlet of the Y-type filter 19 is divided into two carbon source outlets, each of which is connected to a third ball valve 20, a carbon source metering pump 12, one end of a branch safety valve 21 and a fourth ball valve 22 in sequence. After the two carbon source outlets are combined, they are connected to a pulsation damper 23, a back pressure valve 24, a fifth ball valve 25, a second mass flow meter 13 and a sixth ball valve 26 in sequence, and are connected to an inlet of the mixing device 17 through the sixth ball valve 26;

[0091] Both ends of the pipeline where the fifth ball valve 25, the second mass flow meter 13 and the sixth ball valve 26 are located are connected to the first bypass valve 27 through a parallel pipeline;

[0092] The other end of the branch safety valve 21 is connected back to the carbon source storage tank 11 .

[0093] The tap water supply assembly comprises:

[0094] A tap water tank 14, a seventh ball valve 28, two eighth ball valves 29, two tap water metering pumps 15, two pressure gauges 30, two check valves 31, two ninth ball valves 32, a tenth ball valve 33, a third mass flow meter 16 and an eleventh ball valve 34; wherein,

[0095] The outlet pipe of the tap water tank 14 is connected to the seventh ball valve 28 and is divided into two tap water outlets, each of which is connected in sequence to an eighth ball valve 29, a tap water metering pump 15, a pressure gauge 30, a check valve 31 and a ninth ball valve 32;

[0096] The two tap water outlets are connected to the tenth ball valve 33, the third mass flow meter 16 and the eleventh ball valve 34 in sequence after being combined, and are connected to another inlet of the mixing device 17 through the eleventh ball valve 34;

[0097] Both ends of the pipeline where the tenth ball valve 33 , the third mass flowmeter 16 and the eleventh ball valve 34 are located are connected to the second bypass valve 35 through a parallel pipeline.

[0098] See also Figure 7, the instrument and control unit 36 ​​is provided with an online instrument and control cabinet 37. The water inlet pipe D of the anoxic tank A is provided with a first electromagnetic flowmeter 38, a first online COD meter 39 and a first online ammonia nitrogen meter 40, the nitrification liquid return pipe F is provided with a second electromagnetic flowmeter 41 and a first online nitrate nitrogen meter 42, and the sludge return pipe E is provided with a third electromagnetic flowmeter 43 and a second online nitrate nitrogen meter 44. The middle section of the anoxic tank A is provided with an online ORP meter 45, a first online dissolved oxygen meter 46 and an online temperature meter 47. The end of the anoxic tank A is provided with a third online nitrate nitrogen meter 48, a second online ammonia nitrogen meter 49, a second online COD meter 50 and a second online dissolved oxygen meter 51. The control cabinet is electrically connected to the first electromagnetic flowmeter 38, the first online COD meter 39, the first online ammonia nitrogen meter 40, the second electromagnetic flowmeter 41, the first online nitrate nitrogen meter 42, the third electromagnetic flowmeter 43, the second online nitrate nitrogen meter 44, the online ORP meter 45, the first online dissolved oxygen meter 46, the online temperature meter 47, the third online nitrate nitrogen meter 48, the second online ammonia nitrogen meter 49, the second online COD meter 50, the second online dissolved oxygen meter 51 and the carbon source dilution device, respectively, and can control the carbon source flow rate and the tap water flow rate of the carbon source dilution device according to the data of the first electromagnetic flowmeter and the first online COD meter on the water inlet pipe, the data of the second electromagnetic flowmeter 41 and the first online nitrate nitrogen meter 42 on the nitrification liquid reflux pipe, the data of the third electromagnetic flowmeter 43 and the second online nitrate nitrogen meter 44 on the sludge reflux pipe, and in combination with the data of the third online nitrate nitrogen meter 48, the second online ammonia nitrogen meter 49 and the second online COD meter 50 at the end of the anoxic tank, and adjust the carbon source dosage once according to the predetermined time period. Specifically, the flow rate of the carbon source metering pump 12 and the flow rate of the tap water metering pump 15 are controlled according to the data of the flow meter and COD meter on the water inlet pipe, the flow meter and nitric nitrogen meter on the nitrification liquid return pipe, and the flow meter and nitric nitrogen meter on the sludge return pipe, and the data of the nitric nitrogen meter, ammonia nitrogen meter, and COD meter at the end of the anoxic tank. The tap water flow rate is adjusted according to the carbon source dosage, and the tap water flow rate is twice the carbon source flow rate. The carbon source dosage is adjusted once every hour.

[0099] The calculation formula of carbon source flow is as follows:

[0100] Carbon source flow rate (L / h) = [(Q2×C2+Q3×C3)×n-C0×Q1]÷C×1000;

[0101] Q1-water flow, m 3 / h; Q2-nitrification liquid reflux, m 3 / h; Q3-sludge return flow, m 3 / h; C0-raw water COD concentration, mg / L; C2-reflux nitrification liquid NO3 - -N concentration, mg / L; C3-return sludge NO3 --N concentration, mg / L; C-COD equivalent of carbon source after dilution, mg / L; n-carbon-nitrogen ratio, the typical value is 4 to 6.

[0102] It can be known that the control cabinet can use a variety of existing control means to control the amount of carbon source added, such as PLC, single-chip microcomputer, industrial computer and PC, etc., and the control program can use the existing control program.

[0103] Example 2

[0104] Taking a sewage treatment plant in an industrial park as an example, the treatment scale is 30,000 tons / day, and the first and second phases are both 15,000 tons / day. The effluent is required to meet the Class A discharge standard. The first phase uses a constant carbon source dosing device, and the second phase uses a carbon source intelligent and efficient dosing device. The implementation method of the second phase carbon source intelligent and efficient dosing system is as follows.

[0105] See also Figures 1 to 4 , the rear end of the anoxic pool A is connected to the aerobic pool B, and the rear end of the aerobic pool B is provided with an outlet pipe G. Six groups of carbon source dosing devices 1 are arranged on the wall of the anoxic pool A perpendicular to the inlet and outlet directions. The six groups of carbon source dosing devices are evenly arranged in two opposite rows, with 3 groups of carbon source dosing devices in each row. The carbon source dosing devices at both ends are 4 meters away from the inlet and outlet walls respectively. Each group of carbon source dosing devices includes a first ball valve 2, a first mass flow meter 3, a flow regulating valve 4 and a maintenance bypass valve 5. From the inlet to the outlet direction of the anoxic pool, the dosing ratio of the first two groups of carbon source dosing devices is 25%, the dosing ratio of the middle two groups of carbon source dosing devices is 20%, and the dosing ratio of the last two groups of carbon source dosing devices is 5%. The outlet of each group of carbon source dosing devices is located below the liquid surface and is provided with a guide device 6. The guide device 6 is conducive to the migration of the carbon source toward the center of the anoxic pool, increasing the effective contact area between the carbon source and the sewage. Each group of carbon source dosing device outlet is provided with a guide device 6, the guide device 6 outlet is provided with a drug baffle 7, a guide groove 8 and a plurality of guide holes 9, each guide hole has a diameter of 4mm, and each group of guide holes has 7 guide holes, see Figure 5 .

[0106] The carbon source dilution device 10 connected to each carbon source dosing device 1 includes: a carbon source supply component, a tap water supply component and a mixing device 17; wherein, the outlet end of the carbon source supply component is connected to an inlet of the mixing device 17; the outlet end of the tap water supply component is connected to another inlet of the mixing device 17; the carbon source outlet end of the mixing device is used to connect to each carbon source dosing device 1, and can transport the mixed carbon source and tap water to each carbon source dosing device 1.

[0107] Among them, the outlet of the carbon source storage tank 11 of the carbon source supply assembly is connected to the second ball valve 18 and the Y-type filter 19, the outlet of the Y-type filter 19 is divided into two carbon source outlets, each carbon source outlet is connected to the third ball valve 20, the carbon source metering pump 12, the branch safety valve 21, and the fourth ball valve 22 in sequence. After the two carbon source outlets are merged, they are connected to the pulsation damper 23, the back pressure valve 24, the fifth ball valve 25, the second mass flowmeter 13 and the sixth ball valve 26 in sequence, and are connected to the mixing device 17 through the sixth ball valve 26. The first bypass valve 27 is connected to the two ends of the pipeline where the fifth ball valve 25, the second mass flowmeter 13 and the sixth ball valve 26 are located through a parallel pipeline.

[0108] The outlet pipeline of the tap water tank 14 of the tap water supply assembly is divided into two tap water outlets after passing through the seventh ball valve 28, and each tap water outlet is connected to an eighth ball valve 29, a tap water metering pump 15, a pressure gauge 30, a check valve 31 and a ninth ball valve 32 in sequence; the two tap water outlets are connected to the tenth ball valve 33, the third mass flowmeter 16 and the eleventh ball valve 34 after being merged, and the second bypass valve 35 is connected to the two ends of the pipeline where the tenth ball valve 33, the third mass flowmeter 16 and the eleventh ball valve 34 are located through a parallel pipeline.

[0109] The carbon source and tap water are mixed by the mixing device 17 and then connected to the carbon source dosing devices 1 of the anoxic tank A.

[0110] The instrument and control unit 36 ​​for controlling the addition of carbon source are provided with online instruments and control cabinet 37. The water inlet pipe of the anoxic tank is provided with a first electromagnetic flowmeter 38, a first online COD meter 39 and a first online ammonia nitrogen meter 40, the nitrification liquid return pipe is provided with a second electromagnetic flowmeter 41 and a first online nitrate nitrogen meter 42, and the sludge return pipe is provided with a third electromagnetic flowmeter 43 and a second online nitrate nitrogen meter 44. The middle section of the anoxic tank is provided with an online ORP meter 45, a first online dissolved oxygen meter 46 and an online temperature meter 47. The end of the anoxic tank is provided with a third online nitrate nitrogen meter 48, a second online ammonia nitrogen meter 49, a second online COD meter 50 and a second online dissolved oxygen meter 51.

[0111] Each instrument and the carbon source dilution device 10 are connected to the control cabinet 37 for communication. The control cabinet 37 controls the flow rate of the carbon source metering pump 12 and the flow rate of the tap water metering pump 15 according to the data of the flow meter and COD meter on the water inlet pipe, the flow meter and nitric nitrogen meter on the nitrification liquid return pipe, the flow meter and nitric nitrogen meter on the sludge return pipe, and the data of the nitric nitrogen meter, ammonia nitrogen meter, and COD meter at the end of the anoxic tank. The tap water flow rate is adjusted according to the carbon source dosage, and the tap water flow rate is twice the carbon source flow rate. The carbon source dosage is adjusted once every hour.

[0112] The COD equivalent of the carbon source stock solution is 600,000 mg / L. Calculate the carbon source dosage according to the following formula.

[0113] Carbon source flow rate (L / h) = [(Q2×C2+Q3×C3)×n-C0×Q1]÷C×1000

[0114] Q1-water inlet flow, m 3 / h; Q2-nitrification liquid reflux, m 3 / h; Q3-sludge return flow, m 3 / h; C0-raw water COD concentration, mg / L; C2-reflux nitrification liquid NO3 - -N concentration, mg / L; C3-return sludge NO3 - -N concentration, mg / L; C-COD equivalent of carbon source after dilution, mg / L; n-carbon-nitrogen ratio, take 5;

[0115] The outlet COD of the anoxic pool is less than 35mg / L, NO3 — -When N is less than 2 mg / L, the amount of carbon source added remains unchanged;

[0116] The outlet COD of the anoxic pool is less than 35mg / L, NO3 — - When N>2mg / L, the carbon source dosage increased by 5%;

[0117] COD at the outlet of anoxic pool>35mg / L, NO3 — -When N is less than 2 mg / L, the amount of carbon source added is reduced by 5%;

[0118] COD at the outlet of anoxic pool>35mg / L, NO3 — -When N>2mg / L, alarm will be triggered and manual intervention will be required.

[0119] The comparison between this embodiment and the existing constant carbon source dosing device is as follows:

[0120] Table 1 Comparison of the effects of the new carbon source dosing device and the constant carbon source dosing device

[0121] project Phase I Phase II Dosing method Constant amount of stock solution addition New intelligent and efficient carbon source dosing device <![CDATA[Average actual sewage volume (m 3 / d)]]> 15000 15000 <![CDATA[Average carbon source dosage (m 3 / d)]]> 1.7 1.6 Average TN value of effluent (mg / L) 13.5 13.3

[0122] It can be seen from the data in Table 1 that after adopting the carbon source addition system of the utility model, the carbon source addition amount can be saved by 5% to 10%, and the total nitrogen index of the effluent is guaranteed to reach the Class A standard. It has the advantages of low labor intensity and low carbon source consumption, and realizes energy saving and consumption reduction in sewage treatment plants.

[0123] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the utility model, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A carbon source dosing system for anoxic pools, characterized in that: include: Multiple carbon source dosing devices, carbon source dilution devices and instrument control units; among which, A plurality of carbon source dosing devices are evenly arranged in two rows on two walls of the anoxic tank that are perpendicular to the inlet and outlet directions, and the number of carbon source dosing devices in the two rows is equal; the carbon source dosing devices at both ends maintain a predetermined interval with the inlet and outlet walls of the anoxic tank; Each carbon source adding device is connected to the carbon source dilution device through a pipeline, and can be provided with a carbon source by the carbon source dilution device; Each carbon source adding device and the carbon source dilution device are connected to the instrument control unit for communication, and the instrument control unit can control the carbon source dilution device and each carbon source adding device to add carbon source into the anoxic tank at a predetermined flow rate.

2. The carbon source dosing system for anoxic pool according to claim 1, characterized in that: The structures of the carbon source dosing devices are the same, including: Liquid inlet pipeline, first ball valve, first mass flow meter, flow regulating valve, maintenance bypass valve and flow guide device; wherein, The liquid inlet pipeline is provided with a first ball valve, a first mass flow meter and a flow regulating valve in sequence; The inspection bypass valve is connected in parallel to the pipelines at both ends of the ball valve, the first mass flow meter and the flow regulating valve through a bypass pipeline; The liquid outlet end of the liquid inlet pipeline is located in the anoxic pool, and the flow guide device is arranged on the liquid outlet end.

3. The carbon source dosing system for anoxic pool according to claim 2, characterized in that: The flow guiding device comprises: A medicine baffle, a guide groove and a plurality of guide holes; wherein, A medicine baffle is provided at the inlet end of the flow guide device; A guide groove is arranged at the outlet end of the guide device, a plurality of guide holes are arranged in the guide groove, and each guide hole is communicated with the inlet end of the guide device.

4. The carbon source dosing system for anoxic pond according to claim 3, characterized in that: The number of the guide holes is 7, and the 7 guide holes are arranged in a row on the guide groove, and the diameter of each guide hole is 4 mm.

5. The carbon source dosing system for anoxic pool according to any one of claims 1 to 3, characterized in that: The carbon source dilution device comprises: A carbon source supply component, a tap water supply component and a mixing device; wherein, The outlet end of the carbon source supply assembly is connected to an inlet of the mixing device; The outlet end of the tap water supply assembly is connected to another inlet of the mixing device; The carbon source outlet end of the mixing device is used to connect to each carbon source adding device, and can transport the mixed carbon source and tap water to each carbon source adding device.

6. The carbon source dosing system for anoxic pond according to claim 5, characterized in that: The carbon source supply assembly comprises: Carbon source storage tank, second ball valve, Y-type filter, two third ball valves, two carbon source metering pumps, two branch safety valves, two fourth ball valves, pulsation damper, back pressure valve, fifth ball valve, second mass flow meter, sixth ball valve and first bypass valve; wherein, The outlet of the carbon source storage tank is connected to the second ball valve and the Y-type filter in sequence, the outlet of the Y-type filter is divided into two carbon source outlets, each of which is connected to a third ball valve, a carbon source metering pump, one end of a branch safety valve and a fourth ball valve in sequence, and the two carbon source outlets are connected to a pulsation damper, a back pressure valve, a fifth ball valve, a second mass flow meter and a sixth ball valve in sequence after being combined, and are connected to an inlet of the mixing device through the sixth ball valve; Both ends of the pipeline where the fifth ball valve, the second mass flow meter and the sixth ball valve are located are connected to the first bypass valve through a parallel pipeline; The other end of the branch safety valve is back-connected to the carbon source storage tank.

7. The carbon source dosing system for anoxic pond according to claim 5, characterized in that: The tap water supply assembly comprises: A tap water tank, a seventh ball valve, two eighth ball valves, two tap water metering pumps, two pressure gauges, two check valves, two ninth ball valves, a tenth ball valve, a third mass flow meter and an eleventh ball valve; wherein, The outlet pipeline of the tap water tank is connected to the seventh ball valve and is divided into two tap water outlets, each of which is connected to an eighth ball valve, a tap water metering pump, a pressure gauge, a check valve and a ninth ball valve in sequence; The two tap water outlets are connected in sequence to the tenth ball valve, the third mass flow meter and the eleventh ball valve after being combined, and are connected to another inlet of the mixing device through the eleventh ball valve; Both ends of the pipeline where the tenth ball valve, the third mass flowmeter and the eleventh ball valve are located are connected to the second bypass valve through a parallel pipeline.

8. The carbon source dosing system for anoxic pool according to any one of claims 1 to 3, characterized in that: The instrument control unit comprises: The first electromagnetic flowmeter, the first online COD meter, the first online ammonia nitrogen meter, the second electromagnetic flowmeter, the first online nitrate nitrogen meter, the third electromagnetic flowmeter, the second online nitrate nitrogen meter, the online ORP meter, the online dissolved oxygen meter, the online temperature meter, the third online nitrate nitrogen meter, the second online ammonia nitrogen meter, the second online COD meter, the second online dissolved oxygen meter and the control cabinet; wherein, The first electromagnetic flowmeter, the first online COD meter and the first online ammonia nitrogen meter are all arranged on the water inlet pipe of the anoxic tank; The second electromagnetic flowmeter and the first online nitric nitrogen meter are both arranged on the nitrification liquid reflux pipe of the anoxic tank; The third electromagnetic flowmeter and the second online nitric nitrogen meter are both arranged on the sludge return pipe of the anoxic tank; The online ORP meter, online dissolved oxygen meter and online temperature meter are all arranged in the middle section of the anoxic tank; The third online nitric nitrogen meter, the second online ammonia nitrogen meter, the second online COD meter and the second online dissolved oxygen meter are all arranged at the end of the anoxic tank; The control cabinet is electrically connected to the first electromagnetic flowmeter, the first online COD meter, the first online ammonia nitrogen meter, the second electromagnetic flowmeter, the first online nitric nitrogen meter, the third electromagnetic flowmeter, the second online nitric nitrogen meter, the online ORP meter, the online dissolved oxygen meter, the online temperature meter, the third online nitric nitrogen meter, the second online ammonia nitrogen meter, the second online COD meter, the second online dissolved oxygen meter and the carbon source dilution device, respectively, and can control the carbon source flow rate and the tap water flow rate of the carbon source dilution device according to the data of the first electromagnetic flowmeter and the first online COD meter on the water inlet pipe, the data of the second electromagnetic flowmeter and the first online nitric nitrogen meter on the nitrification liquid reflux pipe, the data of the third electromagnetic flowmeter and the second online nitric nitrogen meter on the sludge reflux pipe, and in combination with the data of the third online nitric nitrogen meter, the second online ammonia nitrogen meter and the second online COD meter at the end of the anoxic tank, and adjust the carbon source dosage once according to the preset time period.

Images