Equipment and method for reducing total nitrogen in leather wastewater

Abstract

The invention discloses equipment and a method for reducing total nitrogen in leather wastewater, and the equipment comprises a filter tank, a filter structure, an anaerobic sludge reaction kettle, an anaerobic treatment structure, an aerobic tank, an aerobic treatment structure, a chemical reaction tank, a chemical reaction mixing structure and a plurality of drainage pumps. According to the method, organic matters and ammonia nitrogen in the leather wastewater can be efficiently removed, and the water quality is remarkably improved; the whole treatment process is reasonable in design, simple and easy to operate and convenient to manage and maintain; according to the method, the removal rate of ammonia nitrogen is high, the content of ammonia nitrogen in effluent can be effectively controlled, and up-to-standard discharge is ensured; by controlling the conditions of dissolved oxygen (DO), temperature, pH and the like, the microbial activity can be optimized, and the treatment effect is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of leather production, in particular to a device and a method for reducing total nitrogen in leather wastewater. Background Art

[0002] Currently, the wastewater generated by the leather manufacturing industry contains many pollutants and toxic substances, such as sulfides, chromium, various salts, surfactants, dyes, and biological waste. This wastewater typically has high salt and ammonia nitrogen content, with high concentrations and relatively small amounts of water. Globally, the treatment of this type of wastewater mainly relies on a combination of physical, chemical and biochemical methods.

[0003] In the physicochemical treatment stage, ferrous iron is usually added to precipitate S2- in the water, or manganese sulfate is used to catalyze the oxidation of S2-, followed by the addition of PAM anions to promote flocculation precipitation. The PAM mentioned here, namely polyacrylamide, can effectively bridge and adsorb suspended particles in the solution, showing a strong flocculation effect. After this step, the sludge will be deposited in the mud hopper and enter the sludge thickening tank through the sewage pipe.

[0004] The subsequent biochemical treatment depends on the biochemical facultative oxygen tank and the biochemical aerobic tank. After the physicochemical sedimentation, the wastewater will be introduced into the biochemical facultative oxygen tank after the pH value is adjusted to 7-8. Here, facultative microorganisms decompose the macromolecular organic matter that is difficult to biodegrade into small molecules that are more easily degradable. Subsequently, these easily degradable organic matter and pollutants such as NH3-N will be further decomposed by aerobic microorganisms. This process not only promotes the growth and reproduction of microorganisms, but also effectively purifies the wastewater. The treated wastewater will enter the secondary sedimentation tank for mud and water separation, and finally discharge the clear supernatant. During this process, 96% of the activated sludge will flow back to the biochemical system to maintain its operation, and the remaining 4% will be discharged into the sludge thickening tank for treatment.

[0005] However, this treatment method also faces some challenges. First, a large amount of chemical agents need to be added to treat S2- in the water, which not only produces a large amount of sludge, which brings a heavy burden to the subsequent sludge dehydration and disposal, but also the agents added during the physical and chemical process will further increase the salt content of the wastewater. Since the leather wastewater itself has a high salt content, additional agents further increase the salt content, which causes serious corrosion problems for the biochemical aeration system. For the above problems, there may already be technical means to solve them in the prior art, but this case intends to provide an alternative or replacement technical solution. Summary of the invention

[0006] To achieve the above purpose, the technical solution of the present invention is a device and method for reducing total nitrogen in leather wastewater, comprising the following operating steps: step S1, pretreatment; step S2, anaerobic treatment; step S3, denitrification treatment; step S4, aerobic treatment; step S5, chemical precipitation;

[0007] Step S1: remove coarse suspended matter, grease and other easily precipitated substances in the wastewater, and filter out solid particles through the cooperation of the filter tank and the filter structure;

[0008] Step S2: Under anaerobic conditions, organic matter is converted into gases such as methane and carbon dioxide and a small amount of cellular substances through the action of anaerobic microorganisms (including facultative anaerobic microorganisms), and wastewater is repeatedly drained to anaerobic microorganisms through anaerobic sludge reactors and anaerobic treatment structures, thereby achieving multiple reactions;

[0009] Step S3: Under anoxic conditions, nitrate nitrogen (NO3--N) and nitrite nitrogen (NO2--N) are reduced to nitrogen gas (N2) by the action of denitrifying bacteria, and nitrate is drained and stirred in the wastewater through the anaerobic sludge reactor and the anaerobic treatment structure, thereby achieving a mixed reaction;

[0010] Step S4: In the presence of free oxygen (molecular oxygen), aerobic microorganisms (including facultative microorganisms) degrade organic matter to stabilize and render it harmless. Microorganisms use organic pollutants (mainly dissolved and colloidal) in wastewater as a nutrient source for aerobic metabolism. The liquid after anaerobic treatment is drained to the inner side of the aerobic tank and aerated by rotating, mixing, stirring, and aeration to accelerate the mixing effect.

[0011] Step S5: The chemical reaction tank is coordinated with the chemical reaction mixing structure to perform chemical-assisted precipitation on the wastewater after aerobic treatment.

[0012] In step S5, a precipitant such as lime or iron salt is added to convert ammonia nitrogen in the wastewater into insoluble compounds for precipitation and removal. This method is simple to operate and has a high removal rate for ammonia nitrogen, but attention should be paid to controlling the dosage of the agent and avoiding secondary pollution.

[0013] A device for reducing total nitrogen in leather wastewater, comprising: a filter tank, a filter structure, an anaerobic sludge reactor, an anaerobic treatment structure, an aerobic tank, an aerobic treatment structure, a chemical reaction tank, a chemical reaction mixing structure and a plurality of drainage pumps, wherein the filter tank, the anaerobic sludge reactor, the aerobic tank and the chemical reaction tank are connected to each other through a plurality of drainage pumps, the filter structure is installed on the inner side of the filter tank and the chemical reaction tank, the anaerobic treatment structure is installed on the anaerobic sludge reactor, the aerobic treatment structure is installed on the aerobic tank, and the chemical reaction mixing structure is installed on the chemical reaction tank;

[0014] The chemical reaction mixing structure comprises: a vertical and horizontal screw module, a round bracket, a pair of round sealing blocks, a lifting stirring plate, a plurality of lifting stirring threaded rods, a plurality of lifting stirring threaded tubes, a lifting stirring gear set, a lifting stirring drive, a lifting stirring shaft tube, a plurality of raw material boxes, a feeding chemical shunt pipe, a plurality of chemical feeding valves, a chemical stirring gear box and a chemical stirring drive;

[0015] The vertical and horizontal screw module is installed on the chemical reaction tank, the round bracket is installed on the moving end of the vertical and horizontal screw module, a pair of round sealing blocks are installed on the round bracket, the lifting and extruding plate is movably inserted between the round bracket and the pair of round sealing blocks, a plurality of lifting and stirring threaded pipes are evenly inserted on the lifting and stirring plate, a plurality of lifting and extruding threaded rods are inserted on the pair of round sealing blocks through bearings, the lifting and stirring gear set is installed on a plurality of lifting and stirring threaded rods, and the lifting and stirring drive The machine driving end is connected to the lifting and stirring gear set, the lifting and stirring shaft tube is inserted on the lifting and stirring plate through a bearing, the chemical stirring gear box is sleeved on the lifting and stirring shaft tube, the chemical stirring driving machine driving end is connected to the chemical stirring gear box, several raw material boxes are installed on the circular sealing block, the feeding chemical diversion pipe is sleeved on the lifting and stirring shaft tube through a bearing, several chemical feeding valves are respectively connected to several raw material boxes, and several chemical feeding valves are connected to the feeding chemical diversion pipe.

[0016] Preferably, the filtering structure comprises: a pair of filter transfer boxes, two pairs of L-shaped drainage pipes, a plurality of trumpet-shaped filter blocks, a plurality of filter screens, a pair of filter set boxes, a pair of filter inner boxes, filter carbon, a pair of liquid filling bags, a pair of liquid filling pumps, a pair of liquid filling boxes, a pair of liquid level meters, a pair of lifting concave filter blocks, a pair of filter brackets, a plurality of lifting winches and a plurality of lifting pulley blocks;

[0017] A pair of the filter transfer boxes are respectively connected to the filter pool and the chemical reaction pool, two pairs of the L-shaped drainage pipes are respectively installed on a pair of the filter transfer boxes, the filter pool and the chemical reaction pool, a pair of the filter set boxes are respectively installed on the two pairs of L-shaped drainage pipes, a number of the trumpet-shaped filter blocks are respectively installed on the two pairs of L-shaped drainage pipes, a number of the filter nets are respectively installed on a number of the trumpet-shaped filter blocks, a pair of the filter inner boxes are movably inserted into the inner side of a pair of the filter set boxes, the filter carbon is installed on the inner side of a pair of the filter inner boxes, a pair of the liquid filling bags are installed on the inner side of the chemical reaction pool and the filter pool, a pair of the liquid filling boxes are installed on the The chemical reaction tank and the filter box, a pair of the filling pumps are respectively connected to the pair of the filling boxes, and the pair of the filling pumps are respectively connected to the pair of filling bags, a pair of the liquid level meters are respectively installed on the inner sides of the chemical reaction tank and the filter box, a pair of the filter brackets are respectively installed on the chemical reaction tank and the filter tank, a pair of the lifting concave filter blocks are respectively movably inserted on the inner sides of the chemical reaction tank and the filter tank, a number of the lifting winches are respectively installed on the pair of the filter brackets, and a number of the lifting winches are respectively connected to a pair of the lifting concave filter blocks, and a number of the lifting pulley blocks are installed on a number of the lifting winches.

[0018] Preferably, the anaerobic treatment structure comprises: a plurality of partition plates, a plurality of spider web shunt pipes, a plurality of J-shaped shunt pipes, a plurality of trumpet-shaped one-way plates, a pair of anaerobic raw material boxes, a pair of anaerobic feeding valves, a three-way separator, a plurality of stirring set rings, two pairs of stirring concave bearing blocks, two pairs of anaerobic stirring driving machines, two pairs of anaerobic stirring driving shafts, a plurality of stirring driving discs, a plurality of stirring conductive metal arc blocks and a plurality of stirring magnets;

[0019] Several of the partition plates are evenly inserted into the inner side of the anaerobic sludge reactor, several of the spider web shunt pipes are respectively inserted into the inner side of several of the partition plates, several of the J-type shunt pipes are respectively connected to several of the spider web shunt pipes, several of the stirring sleeve rings are respectively sleeved on several of the J-type shunt pipes, a pair of the anaerobic raw material boxes are installed on the side wall of the anaerobic sludge reactor, a pair of the anaerobic feeding valves are respectively connected to the anaerobic sludge reactor and a pair of the anaerobic raw material boxes, the three-phase separator is installed on the inner side of the anaerobic sludge reactor, and several of the trumpet-type one-way The plates are respectively installed on the inner sides of several of the J-shaped shunt pipes, two pairs of the stirring concave bearing blocks are installed on the outer sides of the anaerobic sludge reactor, two pairs of the anaerobic stirring drive shafts are inserted on the two pairs of the stirring concave bearing blocks, two pairs of the anaerobic stirring drive motor driving ends are connected to the two pairs of the anaerobic stirring drive shafts, several of the stirring drive discs are evenly installed on the two pairs of the anaerobic stirring drive shafts, several of the stirring conductive metal arc blocks are evenly inserted on the anaerobic sludge reactor, and several of the stirring magnets are respectively installed on several of the stirring drive discs and several of the stirring set rings.

[0020] Preferably, the aerobic treatment structure comprises: a well-shaped aeration pipe, a plurality of J-shaped oxygen supply pipes, a plurality of rotating discs, a plurality of rotating feeding spider web pipes, an aeration pump, a plurality of stirring metal arc blocks, a plurality of aerobic drive shafts, a plurality of aerobic gear sets, a plurality of aerobic driving machines and a plurality of aerobic stirring magnets;

[0021] The well-shaped aeration tube is inserted into the inner bottom end of the aerobic pool, a plurality of J-shaped oxygen supply tubes are connected to the well-shaped aeration tube, a plurality of stirring discs are respectively sleeved on the plurality of J-shaped oxygen supply tubes through bearings, a plurality of rotating feeding spider web tubes are respectively inserted into the plurality of rotating discs, and a plurality of rotating feeding spider web tubes are respectively connected to a plurality of J-shaped oxygen supply tubes, the aeration pump is connected to the well-shaped aeration tube, a plurality of stirring metal arc blocks are evenly installed at the bottom end of the aerobic pool, a plurality of aerobic drive shafts are evenly inserted into the bottom end of the aerobic pool, a plurality of aerobic gear sets are respectively installed on a plurality of aerobic drive shafts, a plurality of aerobic drive motor drive ends are respectively connected to a plurality of aerobic gear sets, and a plurality of aerobic stirring magnets are respectively installed on a plurality of aerobic gear sets and a plurality of rotating discs.

[0022] Preferably, pH sensors are respectively provided inside the aerobic treatment structure and the anaerobic sludge reactor.

[0023] Preferably, a pair of scraping screw modules are respectively arranged on the inner sides of the chemical reaction tank and the filtering tank, and circular brackets are respectively arranged on the two pairs of scraping screw modules.

[0024] Preferably, a pair of convex lifting blocks are respectively provided on a pair of the circular brackets, a number of lifting limit shafts are respectively provided on the two pairs of the convex lifting blocks, a set spring is respectively provided on the several lifting limit shafts, and a scraper brush is respectively provided on the two pairs of the convex lifting blocks.

[0025] Preferably, the chemical reaction tank and the filtration tank are provided with discharge valves.

[0026] The equipment and method for reducing total nitrogen in leather wastewater produced by the technical solution of the present invention are as follows: by combining anaerobic and aerobic treatment, the method can efficiently remove organic matter and ammonia nitrogen in leather wastewater and significantly improve water quality; the whole treatment process is reasonably designed, simple and easy to operate, and convenient for management and maintenance; the method has a high removal rate of ammonia nitrogen, can effectively control the ammonia nitrogen content in the effluent, and ensure that the discharge meets the standards; by controlling dissolved oxygen (DO), temperature, pH and other conditions, the activity of microorganisms can be optimized and the treatment effect can be further improved; the use of vertical and horizontal screw modules and lifting and stirring systems can realize multi-angle and multi-position loading, avoid uneven composition and improve treatment efficiency; through the siphon principle and liquid level control, energy consumption is reduced, and automatic drainage and filtration of wastewater are realized at the same time; the methane gas generated during the anaerobic treatment process can be collected and utilized to realize resource recycling; through the design of partition plates and spider web diversion pipes, the segmented treatment of wastewater is realized, which improves the treatment effect and is convenient for expansion and maintenance; the whole treatment process has a high degree of automation, reduces manual intervention and improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of a front and cross-sectional view of an apparatus and method for reducing total nitrogen in leather wastewater according to the present invention.

[0028] Figure 2 This is a schematic diagram of the front and cross-section of an anaerobic sludge reactor of an apparatus and method for reducing total nitrogen in leather wastewater according to the present invention.

[0029] Figure 3 This is a schematic diagram of the main cross-section of an aerobic tank for the equipment and method for reducing total nitrogen in leather wastewater according to the present invention.

[0030] Figure 4 This is a schematic diagram of the main cross-section of a chemical reaction pool of an apparatus and method for reducing total nitrogen in leather wastewater according to the present invention.

[0031] Figure 5 for Figure 4 A partial enlarged view of "A".

[0032] Figure 6 It is a top view and cross-sectional schematic diagram of an apparatus and method for reducing total nitrogen in leather wastewater according to the present invention.

[0033] Figure 7 The present invention provides a schematic top view and cross-sectional view of a chemical reaction tank of an apparatus and method for reducing total nitrogen in leather wastewater.

[0034] Figure 8 The present invention provides a schematic top view and cross-sectional view of an anaerobic sludge reactor for an apparatus and method for reducing total nitrogen in leather wastewater.

[0035] In the figure: 1, filter tank; 2, anaerobic sludge reactor; 3, aerobic tank; 4, chemical reaction tank; 101, vertical and horizontal screw module; 102, round bracket; 103, round seal block; 104, lifting stirring plate; 105, lifting stirring threaded rod; 106, lifting stirring threaded pipe; 107, lifting stirring gear set; 108, lifting stirring drive; 109, lifting stirring shaft pipe; 110, raw material box; 111, feeding chemical diversion pipe; 112, chemical feeding valve; 113, chemical stirring gear box; 114, chemical stirring drive;

[0036] 201, filter transfer box; 202, L-shaped drainage pipe; 203, trumpet-shaped filter block; 204, filter screen; 205, filter set box; 206, filter inner box; 207, filter carbon; 208, liquid filling bag; 209, liquid filling pump; 210, liquid filling box; 211, lifting concave filter block; 212, filter bracket; 213, lifting winch;

[0037] 301, partition plate; 302, spider web shunt pipe; 303, J-type shunt pipe; 304, trumpet-shaped one-way plate; 305, three-way separator; 306, stirring set ring; 307, stirring concave bearing block; 308, anaerobic stirring drive motor; 309, anaerobic stirring drive shaft; 310, stirring drive disc; 311, stirring conductive metal arc block; 312, stirring magnet;

[0038] 401. Well-shaped aeration tube; 402. J-shaped oxygen supply tube; 403. Rotating disc; 404. Rotating feeding spider web tube; 405. Stirring metal arc block; 406. Aerobic drive shaft; 407. Aerobic gear set; 408. Aerobic drive motor; 409. Aerobic stirring magnet. DETAILED DESCRIPTION

[0039] Through the personnel in this field, all the electrical components in this case are connected to their corresponding power supplies through wires, and a suitable controller should be selected according to the actual situation to meet the control requirements. The specific connection and control sequence should refer to the following working principle, and the electrical connection between the electrical components is completed in the order of working in sequence. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principle and process, and does not explain the electrical control.

[0040] Example

[0041] A device and method for reducing total nitrogen in leather wastewater, comprising the following operating steps: step S1, pretreatment; step S2, anaerobic treatment; step S3, denitrification treatment; step S4, aerobic treatment; step S5, chemical precipitation;

[0042] Step S1: remove coarse suspended matter, grease and other easily precipitated substances in the wastewater, and filter out solid particles through the cooperation of the filter tank and the filter structure;

[0043] Step S2: Under anaerobic conditions, organic matter is converted into gases such as methane and carbon dioxide and a small amount of cellular substances through the action of anaerobic microorganisms (including facultative anaerobic microorganisms), and wastewater is repeatedly drained to anaerobic microorganisms through anaerobic sludge reactors and anaerobic treatment structures, thereby achieving multiple reactions;

[0044] Step S3: Under anoxic conditions, nitrate nitrogen (NO3--N) and nitrite nitrogen (NO2--N) are reduced to nitrogen gas (N2) by the action of denitrifying bacteria, and nitrate is drained and stirred in the wastewater through the anaerobic sludge reactor and the anaerobic treatment structure, thereby achieving a mixed reaction;

[0045] Step S4: In the presence of free oxygen (molecular oxygen), aerobic microorganisms (including facultative microorganisms) degrade organic matter to stabilize and render it harmless. Microorganisms use organic pollutants (mainly dissolved and colloidal) in wastewater as a nutrient source for aerobic metabolism. The liquid after anaerobic treatment is drained to the inner side of the aerobic tank and aerated by rotating, mixing, stirring, and aeration to accelerate the mixing effect.

[0046] Step S5: The chemical reaction tank is coordinated with the chemical reaction mixing structure to perform chemical-assisted precipitation on the wastewater after aerobic treatment.

[0047] In step S5, a precipitant such as lime or iron salt is added to convert ammonia nitrogen in the wastewater into insoluble compounds for precipitation and removal. This method is simple to operate and has a high removal rate for ammonia nitrogen, but attention should be paid to controlling the dosage of the agent and avoiding secondary pollution.

[0048] like Figure 1-8As shown, the filter tank, the anaerobic sludge reactor, the aerobic tank and the chemical reaction tank are connected to each other through a plurality of drainage pumps, the filter structure is installed on the inner side of the filter tank and the chemical reaction tank, the anaerobic treatment structure is installed on the anaerobic sludge reactor, the aerobic treatment structure is installed on the aerobic tank, and the chemical reaction mixing structure is installed on the chemical reaction tank;

[0049] Specifically, the chemical reaction mixing structure includes: a vertical and horizontal screw module, a round bracket, a pair of round sealing blocks, a lifting stirring plate, a plurality of lifting stirring threaded rods, a plurality of lifting stirring threaded tubes, a lifting stirring gear set, a lifting stirring drive, a lifting stirring shaft tube, a plurality of raw material boxes, a feeding chemical shunt pipe, a plurality of chemical feeding valves, a chemical stirring gear box and a chemical stirring drive;

[0050] Specifically, the vertical and horizontal screw module is installed on the chemical reaction tank, the round-shaped bracket is installed on the moving end of the vertical and horizontal screw module, a pair of round-shaped sealing blocks are installed on the round-shaped bracket, the lifting and extrusion plate is movably inserted between the round-shaped bracket and the pair of round-shaped sealing blocks, a plurality of lifting and stirring threaded tubes are evenly inserted on the lifting and stirring plate, a plurality of lifting and extrusion threaded rods are inserted on the pair of round-shaped sealing blocks through bearings, the lifting and stirring gear set is installed on a plurality of lifting and stirring threaded rods, and the lifting and stirring The driving end of the driving machine is connected to the lifting and stirring gear set, the lifting and stirring shaft tube is inserted on the lifting and stirring plate through a bearing, the chemical stirring gear box is sleeved on the lifting and stirring shaft tube, the driving end of the chemical stirring driving machine is connected to the chemical stirring gear box, a number of the raw material boxes are installed on the round-shaped sealing block, the feeding chemical shunt pipe is sleeved on the lifting and stirring shaft tube through a bearing, a number of the chemical feeding valves are respectively connected to a number of the raw material boxes, and a number of the chemical feeding valves are connected to the feeding chemical shunt pipe;

[0051] It should be noted that, in the above, the liquid is first drained to the inner side of the filter tank, and the solid matter in the leather wastewater is filtered out through the filter structure inside the filter tank. At the same time, the wastewater is anaerobically treated through the anaerobic treatment structure inside the anaerobic sludge reactor, and the organic matter in the wastewater is decomposed by anaerobic microorganisms, and ammonia nitrogen is partially removed. The anaerobic process significantly reduces the organic load, creating favorable conditions for subsequent aerobic treatment. The wastewater after anaerobic treatment is drained to the inner side of the aerobic tank, and the wastewater inside the aerobic tank is aerobic treated by the aerobic treatment structure to further degrade the remaining organic matter, and ammonia nitrogen is removed through the nitrification-denitrification process. Control the dissolved oxygen (DO), temperature, pH and other conditions to optimize the microbial activity and ensure that the effluent ammonia nitrogen meets the standard. After that, the aerobic treated wastewater is drained to the inner side of the chemical reaction tank through the drainage pump, and the ammonia nitrogen in the wastewater is converted into insoluble compounds and precipitated and removed by adding precipitants such as lime and iron salts. This method is simple to operate and has a high removal rate for ammonia nitrogen, but it is necessary to control the dosage of the reagent and avoid secondary pollution. The solid particles produced by the chemical reaction mixing structure are quickly filtered through the filtering structure, and the vertical and horizontal screw modules are operated to drive the circular bracket on it to move vertically and horizontally. The circular bracket drives a pair of circular sealing blocks on it, and the lifting and stirring driving machine is operated to drive the lifting and stirring gear set on the driving end of the lifting and stirring driving machine to operate. The lifting and stirring gear set drives the plurality of lifting and stirring threaded rods on it to rotate, and the plurality of lifting and stirring threaded rods respectively drive the lifting and stirring threaded tubes on it, and the plurality of lifting and stirring threaded tubes respectively drive the lifting and stirring plates on it, so that the lifting and stirring plates move along the circular path. shaped bracket and a pair of round-shaped sealing blocks for stable lifting and lowering, the lifting stirring plate drives the chemical stirring driving machine and the chemical stirring gear box thereon, the chemical stirring driving machine runs, drives the chemical stirring gear box on the driving end to run, and drives the lifting stirring shaft tube inside thereof to rotate through the chemical stirring gear box, and through the rotation of the lifting stirring shaft tube, the inside of the chemical reaction pool is moved vertically and horizontally in the horizontal direction and lifted and stirred in the vertical direction, and at the same time, a number of chemical feeding valves are opened one by one, so that a number of raw material boxes are fed one by one, so as to achieve the goal of guiding the chemical raw materials to the bottom end of the inner side of the chemical reaction pool, so as to achieve multi-angle and multi-position feeding, thereby avoiding the phenomenon of uneven composition.

[0052] like Figure 1-8 As shown, the filtering structure comprises: a pair of filter transfer boxes, two pairs of L-shaped drainage pipes, a plurality of trumpet-shaped filter blocks, a plurality of filter screens, a pair of filter set boxes, a pair of filter inner boxes, filter carbon, a pair of liquid filling bags, a pair of liquid filling pumps, a pair of liquid filling boxes, a pair of liquid level meters, a pair of lifting concave filter blocks, a pair of filter brackets, a plurality of lifting winches and a plurality of lifting pulley blocks;

[0053] Specifically, a pair of the filter transfer boxes are respectively connected to the filter pool and the chemical reaction pool, two pairs of the L-shaped drainage pipes are respectively installed on a pair of the filter transfer boxes, the filter pool and the chemical reaction pool, a pair of the filter set boxes are respectively installed on the two pairs of the L-shaped drainage pipes, a number of the trumpet-shaped filter blocks are respectively installed on the two pairs of the L-shaped drainage pipes, a number of the filter nets are respectively installed on a number of the trumpet-shaped filter blocks, a pair of the filter inner boxes are movably inserted into the inner side of a pair of the filter set boxes, the filter carbon is installed on the inner side of a pair of the filter inner boxes, a pair of the liquid filling bags are installed on the inner side of the chemical reaction pool and the filter pool, a pair of the liquid filling boxes are installed On the chemical reaction tank and the filter box, a pair of the liquid filling pumps are respectively connected to a pair of the liquid filling boxes, and a pair of the liquid filling pumps are respectively connected to a pair of the liquid filling bags, a pair of the liquid level meters are respectively installed on the inner sides of the chemical reaction tank and the filter box, a pair of the filter brackets are respectively installed on the chemical reaction tank and the filter tank, a pair of the lifting concave filter blocks are respectively movably inserted on the inner sides of the chemical reaction tank and the filter tank, a number of the lifting winches are respectively installed on a pair of the filter brackets, and a number of the lifting winches are respectively connected to a pair of the lifting concave filter blocks, and a number of the lifting pulley blocks are installed on a number of the lifting winches;

[0054] It should be noted that, in the above, the liquid in the liquid filling box is drained to the inside of the liquid filling bag by the liquid filling pump, and the liquid level in the filter pool and the chemical reaction pool is changed by the expansion of the liquid filling bag. When the liquid level is higher than the L-shaped drainage tube, the liquid is drained to the inside of the L-shaped drainage tube by the siphon principle. At the same time, the liquid in the filter pool and the chemical reaction pool is drained to the inside of the filter transfer box by the siphon principle. A pair of L-shaped drainage tubes and the filter set box are combined to form a U-shaped siphon pipeline. At the same time, the L-shaped drainage tubes are used to drain the liquid in the filter pool and the chemical reaction tank. The trumpet-shaped filter block in the tube limits the liquid and drains it upward, while filtering the wastewater through the filter inner box inside the filter set box, filtering out solid particles through filter carbon, and moving the circular bracket to the outside of the filter tank or chemical reaction tank through the operation of the vertical and horizontal screw modules. After that, several lifting winches on the filter bracket are operated to drive the lifting pulley group thereon, and through the cooperation of the lifting winch, the lifting concave filter block on the lifting winch is stably lifted and lowered, thereby achieving rapid filtration of solid particles.

[0055] like Figure 1-8As shown, the anaerobic treatment structure includes: a plurality of partition plates, a plurality of spider web shunt pipes, a plurality of J-shaped shunt pipes, a plurality of trumpet-shaped one-way plates, a pair of anaerobic raw material boxes, a pair of anaerobic feeding valves, a three-way separator, a plurality of stirring set rings, two pairs of stirring concave bearing blocks, two pairs of anaerobic stirring driving machines, two pairs of anaerobic stirring driving shafts, a plurality of stirring driving discs, a plurality of stirring conductive metal arc blocks and a plurality of stirring magnets;

[0056] Specifically, a plurality of the partition plates are evenly inserted into the inner side of the anaerobic sludge reactor, a plurality of the spider web shunt pipes are respectively inserted into the inner side of a plurality of the partition plates, a plurality of the J-shaped shunt pipes are respectively connected to a plurality of the spider web shunt pipes, a plurality of the stirring sleeve rings are respectively sleeved on a plurality of the J-shaped shunt pipes, a pair of the anaerobic raw material boxes are installed on the side wall of the anaerobic sludge reactor, a pair of the anaerobic feeding valves are respectively connected to the anaerobic sludge reactor and a pair of the anaerobic raw material boxes, the three-phase separator is installed on the inner side of the anaerobic sludge reactor, a plurality of the trumpet-shaped The one-way sheets are respectively installed on the inner sides of several J-shaped shunt pipes, two pairs of the concave stirring bearing blocks are installed on the outer sides of the anaerobic sludge reactor, two pairs of the anaerobic stirring drive shafts are inserted on the two pairs of the concave stirring bearing blocks, two pairs of the anaerobic stirring drive motor driving ends are connected to the two pairs of the anaerobic stirring drive shafts, several stirring drive discs are evenly installed on the two pairs of the anaerobic stirring drive shafts, several stirring conductive metal arc blocks are evenly inserted on the anaerobic sludge reactor, and several stirring magnets are respectively installed on several stirring drive discs and several stirring set rings;

[0057] It should be noted that, in the above, the anaerobic sludge reactor is divided into several sections by several partitions, and the liquid at the bottom of the partition is drained upward by the spider web diversion pipe through the siphon principle, so that the liquid is drained to several J-type diversion pipes, and the liquid is drained to the microorganisms on several partitions through several J-type diversion pipes, and fully contacted with anaerobic microorganisms under anaerobic conditions to carry out anaerobic decomposition reaction. Depending on the specific process, the anaerobic reactor can be an upflow anaerobic sludge blanket (UASB), an anaerobic granular sludge expanded bed (EGSB), etc., and the gas (mainly methane), liquid (treated wastewater) and solid (sludge) are separated by a three-phase separator. The gas is collected and utilized, the liquid is discharged from the system, and part of the sludge is refluxed to maintain the biomass in the reactor. The anaerobic feeding valve on the anaerobic raw material box is operated to guide the microorganisms and nitrates to the top of a pair of partition plates. The anaerobic stirring driver is operated to drive the anaerobic stirring drive shaft on the driving end of the anaerobic stirring driver to rotate, so that the anaerobic stirring drive shaft rotates along the stirring concave bearing block, while driving a plurality of stirring driving discs thereon. The stirring magnets on the plurality of stirring driving discs transmit the magnetism to a plurality of stirring conductive metal arc blocks, and the magnetism is transmitted to the stirring magnets on the plurality of stirring suit arc blocks through the plurality of stirring conductive metal arc blocks, so that the microorganisms and nitrates are evenly stirred.

[0058] like Figure 1-8 As shown, the aerobic treatment structure includes: a well-shaped aeration pipe, a plurality of J-shaped oxygen supply pipes, a plurality of rotating discs, a plurality of rotating feeding spider web pipes, an aeration pump, a plurality of stirring metal arc blocks, a plurality of aerobic drive shafts, a plurality of aerobic gear sets, a plurality of aerobic driving machines and a plurality of aerobic stirring magnets;

[0059] Specifically, the well-shaped aeration tube is inserted into the inner bottom end of the aerobic pool, a plurality of the J-shaped oxygen supply tubes are connected to the well-shaped aeration tube, a plurality of the stirring discs are respectively sleeved on the plurality of the J-shaped oxygen supply tubes through bearings, a plurality of the rotating feeding spider web tubes are respectively inserted into the plurality of the rotating discs, and a plurality of the rotating feeding spider web tubes are respectively connected to a plurality of the J-shaped oxygen supply tubes, the aeration pump is connected to the well-shaped aeration tube, a plurality of the stirring metal arc blocks are evenly installed at the bottom end of the aerobic pool, a plurality of the aerobic drive shafts are evenly inserted into the bottom end of the aerobic pool, a plurality of the aerobic gear sets are respectively installed on a plurality of the aerobic drive shafts, a plurality of the aerobic drive motor drive ends are respectively connected to a plurality of the aerobic gear sets, and a plurality of the aerobic stirring magnets are respectively installed on a plurality of the aerobic gear sets and a plurality of the rotating discs;

[0060] It should be noted that, in the above, the anaerobic wastewater is drained to the inner side of the aerobic tank through the drainage pump, the oxygen is drained to the inner side of the well-shaped aeration pipe through the oxygenation pump, and the wastewater is drained to the inner side of the rotating feeding spider web tubes on the rotating discs through the several J-shaped oxygenation tubes on the well-shaped aeration pipe, and the oxygen is drained to the inner side of the aerobic tank through the several rotating feeding spider web tubes. The pollutants in the sewage contact with the microorganisms in the activated sludge and are adsorbed on the sludge flocs. Aeration provides sufficient oxygen, and the aerobic microorganisms use the adsorbed organic matter for aerobic metabolism, degrade the organic matter and release energy. The oxidized mixed liquor enters the secondary sedimentation tank, the activated sludge settles down under the action of gravity, and the supernatant is discharged as treated water. At the same time, it is operated by the aerobic driving machine, driving the aerobic gear set on the driving end of the aerobic driving machine to operate, driving several aerobic stirring magnets on the aerobic gear set, and transferring magnetism to several stirring metal arc blocks through several aerobic stirring magnets, and transferring magnetism to several aerobic stirring magnets on several rotating discs through several stirring metal arc blocks, so that the rotating disc rotates on the J-type oxygen supply pipe, thereby achieving the purpose of rotating oxygen feeding.

[0061] As a preferred solution, further, pH sensors are respectively provided inside the aerobic treatment structure and the anaerobic sludge reactor.

[0062] As a preferred solution, further, a pair of scraping screw modules are respectively arranged on the inner sides of the chemical reaction tank and the filter tank, and circular brackets are respectively arranged on the two pairs of scraping screw modules.

[0063] As a preferred solution, further, a pair of convex lifting blocks are respectively provided on a pair of the circular brackets, a number of lifting limit shafts are respectively provided on the two pairs of the convex lifting blocks, a number of lifting limit shafts are respectively provided with set springs, and a scraper brush is respectively provided on the two pairs of the convex lifting blocks.

[0064] As a preferred solution, further, the chemical reaction tank and the filtration tank are provided with discharge valves.

[0065] The above technical solutions only reflect the preferred technical solutions of the technical solutions of the present invention. Some changes that may be made to certain parts thereof by technicians in this technical field all reflect the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. An apparatus and method for reducing total nitrogen in leather wastewater, comprising the following operating steps: step S1, pretreatment; step S2, anaerobic treatment; step S3, denitrification treatment; step S4, aerobic treatment; step S5, chemical precipitation; Step S1: remove coarse suspended matter, grease and other easily precipitated substances in the wastewater, and filter out solid particles through the cooperation of the filter tank and the filter structure; Step S2: Under anaerobic conditions, organic matter is converted into gases such as methane and carbon dioxide and a small amount of cellular substances through the action of anaerobic microorganisms (including facultative anaerobic microorganisms), and wastewater is repeatedly drained to anaerobic microorganisms through anaerobic sludge reactors and anaerobic treatment structures, thereby achieving multiple reactions; Step S3: Under anoxic conditions, nitrate nitrogen (NO3--N) and nitrite nitrogen (NO2--N) are reduced to nitrogen gas (N2) by the action of denitrifying bacteria, and nitrate is drained and stirred in the wastewater through the anaerobic sludge reactor and the anaerobic treatment structure, thereby achieving a mixed reaction; Step S4: In the presence of free oxygen (molecular oxygen), aerobic microorganisms (including facultative microorganisms) degrade organic matter to stabilize and render it harmless. Microorganisms use organic pollutants (mainly dissolved and colloidal) in wastewater as a nutrient source for aerobic metabolism. The liquid after anaerobic treatment is drained to the inner side of the aerobic tank and aerated by rotating, mixing, stirring, and aeration to accelerate the mixing effect. Step S5: The chemical reaction tank is coordinated with the chemical reaction mixing structure to perform chemical-assisted precipitation on the wastewater after aerobic treatment.

2. The device and method for reducing total nitrogen in leather wastewater according to claim 1, characterized in that: In step S5, a precipitant such as lime or iron salt is added to convert ammonia nitrogen in the wastewater into insoluble compounds for precipitation and removal. This method is simple to operate and has a high removal rate for ammonia nitrogen, but attention should be paid to controlling the dosage of the agent and avoiding secondary pollution.

3. A device for reducing total nitrogen in leather wastewater according to claim 1-2, characterized in that, include: A filter tank, a filter structure, an anaerobic sludge reactor, an anaerobic treatment structure, an aerobic tank, an aerobic treatment structure, a chemical reaction tank, a chemical reaction mixing structure and a plurality of drainage pumps, wherein the filter tank, the anaerobic sludge reactor, the aerobic tank and the chemical reaction tank are connected to each other through a plurality of drainage pumps, the filter structure is installed on the inner side of the filter tank and the chemical reaction tank, the anaerobic treatment structure is installed on the anaerobic sludge reactor, the aerobic treatment structure is installed on the aerobic tank, and the chemical reaction mixing structure is installed on the chemical reaction tank; The chemical reaction mixing structure comprises: a vertical and horizontal screw module, a round bracket, a pair of round sealing blocks, a lifting stirring plate, a plurality of lifting stirring threaded rods, a plurality of lifting stirring threaded tubes, a lifting stirring gear set, a lifting stirring drive, a lifting stirring shaft tube, a plurality of raw material boxes, a feeding chemical shunt pipe, a plurality of chemical feeding valves, a chemical stirring gear box and a chemical stirring drive; The vertical and horizontal screw module is installed on the chemical reaction tank, the round bracket is installed on the moving end of the vertical and horizontal screw module, a pair of round sealing blocks are installed on the round bracket, the lifting and extruding plate is movably inserted between the round bracket and the pair of round sealing blocks, a plurality of lifting and stirring threaded pipes are evenly inserted on the lifting and stirring plate, a plurality of lifting and extruding threaded rods are inserted on the pair of round sealing blocks through bearings, the lifting and stirring gear set is installed on a plurality of lifting and stirring threaded rods, and the lifting and stirring drive The machine driving end is connected to the lifting and stirring gear set, the lifting and stirring shaft tube is inserted on the lifting and stirring plate through a bearing, the chemical stirring gear box is sleeved on the lifting and stirring shaft tube, the chemical stirring driving machine driving end is connected to the chemical stirring gear box, several raw material boxes are installed on the circular sealing block, the feeding chemical diversion pipe is sleeved on the lifting and stirring shaft tube through a bearing, several chemical feeding valves are respectively connected to several raw material boxes, and several chemical feeding valves are connected to the feeding chemical diversion pipe.

4. A device for reducing total nitrogen in leather wastewater according to claim 3, characterized in that: The filtering structure comprises: a pair of filter transfer boxes, two pairs of L-shaped drainage pipes, a plurality of trumpet-shaped filter blocks, a plurality of filter screens, a pair of filter set boxes, a pair of filter inner boxes, filter carbon, a pair of liquid filling bags, a pair of liquid filling pumps, a pair of liquid filling boxes, a pair of liquid level meters, a pair of lifting concave filter blocks, a pair of filter brackets, a plurality of lifting winches and a plurality of lifting pulley blocks; A pair of the filter transfer boxes are respectively connected to the filter pool and the chemical reaction pool, two pairs of the L-shaped drainage pipes are respectively installed on a pair of the filter transfer boxes, the filter pool and the chemical reaction pool, a pair of the filter set boxes are respectively installed on the two pairs of L-shaped drainage pipes, a number of the trumpet-shaped filter blocks are respectively installed on the two pairs of L-shaped drainage pipes, a number of the filter nets are respectively installed on a number of the trumpet-shaped filter blocks, a pair of the filter inner boxes are movably inserted into the inner side of a pair of the filter set boxes, the filter carbon is installed on the inner side of a pair of the filter inner boxes, a pair of the liquid filling bags are installed on the inner side of the chemical reaction pool and the filter pool, a pair of the liquid filling boxes are installed on the The chemical reaction tank and the filter box, a pair of the filling pumps are respectively connected to the pair of the filling boxes, and the pair of the filling pumps are respectively connected to the pair of filling bags, a pair of the liquid level meters are respectively installed on the inner sides of the chemical reaction tank and the filter box, a pair of the filter brackets are respectively installed on the chemical reaction tank and the filter tank, a pair of the lifting concave filter blocks are respectively movably inserted on the inner sides of the chemical reaction tank and the filter tank, a number of the lifting winches are respectively installed on the pair of the filter brackets, and a number of the lifting winches are respectively connected to a pair of the lifting concave filter blocks, and a number of the lifting pulley blocks are installed on a number of the lifting winches.

5. A device for reducing total nitrogen in leather wastewater according to claim 4, characterized in that: The anaerobic treatment structure comprises: a plurality of partition plates, a plurality of spider web shunt pipes, a plurality of J-shaped shunt pipes, a plurality of trumpet-shaped one-way plates, a pair of anaerobic raw material boxes, a pair of anaerobic feeding valves, a three-way separator, a plurality of stirring set rings, two pairs of stirring concave bearing blocks, two pairs of anaerobic stirring driving machines, two pairs of anaerobic stirring driving shafts, a plurality of stirring driving discs, a plurality of stirring conductive metal arc blocks and a plurality of stirring magnets; Several of the partition plates are evenly inserted into the inner side of the anaerobic sludge reactor, several of the spider web shunt pipes are respectively inserted into the inner side of several of the partition plates, several of the J-type shunt pipes are respectively connected to several of the spider web shunt pipes, several of the stirring sleeve rings are respectively sleeved on several of the J-type shunt pipes, a pair of the anaerobic raw material boxes are installed on the side wall of the anaerobic sludge reactor, a pair of the anaerobic feeding valves are respectively connected to the anaerobic sludge reactor and a pair of the anaerobic raw material boxes, the three-phase separator is installed on the inner side of the anaerobic sludge reactor, and several of the trumpet-type one-way The plates are respectively installed on the inner sides of several of the J-shaped shunt pipes, two pairs of the stirring concave bearing blocks are installed on the outer sides of the anaerobic sludge reactor, two pairs of the anaerobic stirring drive shafts are inserted on the two pairs of the stirring concave bearing blocks, two pairs of the anaerobic stirring drive motor driving ends are connected to the two pairs of the anaerobic stirring drive shafts, several of the stirring drive discs are evenly installed on the two pairs of the anaerobic stirring drive shafts, several of the stirring conductive metal arc blocks are evenly inserted on the anaerobic sludge reactor, and several of the stirring magnets are respectively installed on several of the stirring drive discs and several of the stirring set rings.

6. The device for reducing total nitrogen in leather wastewater according to claim 5, characterized in that: The aerobic treatment structure comprises: a well-shaped aeration pipe, a plurality of J-shaped oxygen supply pipes, a plurality of rotating discs, a plurality of rotating feeding spider web pipes, an aeration pump, a plurality of stirring metal arc blocks, a plurality of aerobic drive shafts, a plurality of aerobic gear sets, a plurality of aerobic driving machines and a plurality of aerobic stirring magnets; The well-shaped aeration tube is inserted into the inner bottom end of the aerobic pool, a plurality of J-shaped oxygen supply tubes are connected to the well-shaped aeration tube, a plurality of stirring discs are respectively sleeved on the plurality of J-shaped oxygen supply tubes through bearings, a plurality of rotating feeding spider web tubes are respectively inserted into the plurality of rotating discs, and a plurality of rotating feeding spider web tubes are respectively connected to a plurality of J-shaped oxygen supply tubes, the aeration pump is connected to the well-shaped aeration tube, a plurality of stirring metal arc blocks are evenly installed at the bottom end of the aerobic pool, a plurality of aerobic drive shafts are evenly inserted into the bottom end of the aerobic pool, a plurality of aerobic gear sets are respectively installed on a plurality of aerobic drive shafts, a plurality of aerobic drive motor drive ends are respectively connected to a plurality of aerobic gear sets, and a plurality of aerobic stirring magnets are respectively installed on a plurality of aerobic gear sets and a plurality of rotating discs.

7. The device for reducing total nitrogen in leather wastewater according to claim 6, characterized in that: The inner sides of the aerobic treatment structure and the anaerobic sludge reactor are respectively provided with pH sensors.

8. The device for reducing total nitrogen in leather wastewater according to claim 7, characterized in that: A pair of scraping screw modules are respectively arranged on the inner sides of the chemical reaction tank and the filtering tank, and circular brackets are respectively arranged on the two pairs of scraping screw modules.

9. The device for reducing total nitrogen in leather wastewater according to claim 8, characterized in that: A pair of convex lifting blocks are respectively arranged on a pair of the circular brackets, a plurality of lifting limit shafts are respectively arranged on the two pairs of the convex lifting blocks, a set spring is respectively arranged on the plurality of lifting limit shafts, and a scraper brush is respectively arranged on the two pairs of the convex lifting blocks.

10. The device for reducing total nitrogen in leather wastewater according to claim 9, characterized in that: The chemical reaction tank and the filter tank are provided with discharge valves.

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