CN108975621B - Sewage grading treatment system and method for leather production - Google Patents
Sewage grading treatment system and method for leather production Download PDFInfo
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- CN108975621B CN108975621B CN201810918561.8A CN201810918561A CN108975621B CN 108975621 B CN108975621 B CN 108975621B CN 201810918561 A CN201810918561 A CN 201810918561A CN 108975621 B CN108975621 B CN 108975621B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
- C02F2103/24—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof from tanneries
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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Abstract
The invention discloses a sewage grading treatment system and a sewage grading treatment method for leather production, and the sewage grading treatment system comprises a case, wherein a treatment tank is arranged on the right side of the case, a stirrer is arranged in the middle of the inside of the treatment tank, a water pump is arranged on the right side of the treatment tank, an intelligent detector is arranged at the output end of the water pump through a water pipe, a chromium removal tank is arranged on one side of the water pump, which is far away from the treatment tank, a dust suction pump is arranged at the top end of the chromium removal tank, an inclined plate is arranged in the chromium removal tank, a semipermeable membrane is embedded in the inclined plate, sludge storage tanks are arranged at the bottom ends of the second sedimentation tank and the first sedimentation tank, sludge pumps are arranged at the bottom ends of the first sedimentation tank and the second sedimentation tank, and a filter press is arranged at the bottom end of the sludge pumps. The invention effectively separates chromium ions by the semipermeable membrane, has good separation effect, greatly improves the heavy metal removal efficiency, can detect the PH value and the chromaticity by the intelligent tester, has simple operation, obvious observation and cost saving, is provided with a perfect sludge treatment system, and realizes thorough treatment.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sewage grading treatment system and a sewage grading treatment method for leather production.
Background
Along with the continuous development of society, the continuous progress of science, the problem of sewage treatment is more and more paid attention to by people, the sewage composition of leather production is complicated, it is serious to pollute, the pH value is very high, direct discharge can cause very big pollution to the living environment, the processing system of tanning sewage emerges in a large number, and be compelled, but the sewage treatment system of current leather production all has some problems, can not simply get rid of heavy metal chromium effectively, it is unclean to exist to clear away, thoroughly, there is not simple detection structure, it all will spend a large amount of time and manpower to detect every time, more not perfect sludge treatment system, it does not obtain effectual processing to produce a large amount of mud after the processing is accomplished.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a sewage grading treatment system and a sewage grading treatment method for leather production, which aim to solve the problems that heavy metal chromium cannot be simply and effectively removed, a simple detection structure is not provided, and a perfect sludge treatment system is not provided in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: a sewage grading treatment system for leather production comprises a case, wherein a single chip microcomputer is arranged inside the case, a control button is arranged at the top end of the case, a treatment tank is arranged on the right side of the case, a water inlet is formed in the left wall of the treatment tank, a stirrer is arranged at the middle position inside the treatment tank, a ferrous sulfate bin is arranged on one side of the top end of the treatment tank, a lime bin is arranged at the top end of the treatment tank on the right side of the ferrous sulfate bin, a water pump is arranged on the right side of the lime bin, the input end of the water pump is connected with the treatment tank, and an intelligent detector is arranged at the output end of the water pump through a water pipe; the utility model discloses an intelligent detection appearance, including intelligent detection appearance, water pump, adsorption tube, water pump, etc. intelligent detection appearance is provided with the extraction mouth, the inner wall of intelligent detection appearance is provided with the PH sensor, intelligent detection appearance and the connecting pipe between the processing pond are provided with first solenoid valve, intelligent detection appearance is kept away from processing pond one side and is provided with the conveyer pipe, and one side of conveyer pipe is provided with the second solenoid valve, one side that the processing pond was kept away from to the water pump is provided with the chromium pond, and the top in chromium pond is provided with the dust absorption pump, the output of dust absorption pump is provided with collects the chamber, and just collects one side in chamber and is provided with the adsorption tube, the adsorption tube passes the chromium pond top and extends to the inside of chromium pond, the inside swash plate that is located under the adsorption tube that is provided with of chromium pond, inside the inlaying of swash plate has the pellicle.
Preferably, the right side of the dechromization tank is provided with a first sedimentation tank through a connecting pipe, one side of the first sedimentation tank far away from the dechromization tank is provided with a second sedimentation tank, a nitrosation tank is arranged between the first sedimentation tank and the second sedimentation tank, one side of the nitrosation tank is provided with a vent pipe, the vent pipe sequentially penetrates through the right wall of the nitrosation tank and the top end of the second sedimentation tank to extend to the outside of the second sedimentation tank, the top end of the nitrosation tank is provided with an anoxic tank, and the right wall of the second sedimentation tank is provided with a water outlet.
Preferably, the inside bottom of second sedimentation tank and first sedimentation tank all is provided with mud storage tank, the bottom of first sedimentation tank and second sedimentation tank all is provided with the sludge pump, and the bottom of sludge pump is provided with the pressure filter, the top of pressure filter is provided with the air entrainment pump, and the output of air entrainment pump is provided with the gas-supply pipe, and the gas-supply pipe passes and nitrosation bottom of the pool end extends to nitrosation inside the pond.
Preferably, a medicine dispensing box is arranged at the top end inside the pressure filter, a medicine storage box is arranged at the bottom end inside the medicine dispensing box, a stirring tank is arranged at the top end of the medicine storage box, and a medicine adding chamber is arranged at the top end inside the stirring tank.
Preferably, the inclined plate is embedded in the chromium removing pool, and the included angle between the inclined plate and the horizontal plane is 15 degrees.
Preferably, holes are uniformly formed in one side of the dust suction pump, and the holes are the same in size.
Preferably, the vent pipe is in an inverted L shape, and the diameter of an output port of the vent pipe is smaller than that of an input port of the vent pipe.
Preferably, the bottom end in the treatment tank is uniformly provided with a heating rod, and the heating rod is S-shaped.
Preferably, the output end of the control button is electrically connected with the input end of the single chip microcomputer through a wire, the output end of the PH sensor is electrically connected with the input end of the single chip microcomputer, the output end of the single chip microcomputer is electrically connected with the first electromagnetic valve, the second electromagnetic valve and the digital screen through wires, and the output end of the single chip microcomputer is electrically connected with the stirrer, the water pump, the dust suction pump, the sludge pump, the air adding pump, the filter press, the heating rod and the water inlet through wires.
A sewage grading treatment method for leather production comprises the following steps:
s1: injecting sewage into the treatment tank through a water inlet, opening a ferrous sulfate bin, reacting ferrous sulfate in the ferrous sulfate bin with the sewage, and simultaneously opening a heating rod and a stirrer to stir and heat the sewage;
s2: observing the color of the sewage through an observation window on the surface of the intelligent detection instrument, starting a lime bin when the sewage is clear, adding lime in the lime bin into a treatment tank to react with the sewage, closing a first electromagnetic valve if the pH value of the sewage reaches the standard, opening a second electromagnetic valve, and conveying the sewage into a dechromization tank;
s3: when sewage entering the chromium pool passes through the semipermeable membrane, heavy metal chromium is retained on the semipermeable membrane, and the dust suction pump is started through the control button to suck the heavy metal into the collection cavity;
s4: the sewage enters a first sedimentation tank to form sediment, and finally stays on a sludge storage tank, the sewage which does not form the sediment enters an anoxic tank and flows into a nitrosation tank, and then oxygen is added into the nitrosation tank through an air adding pump, so that the sewage treatment can be continuously carried out;
s5: then the sewage flows into a second sedimentation tank, the generated sludge is settled on a sludge storage tank, and finally the water reaching the standard is discharged through a water outlet.
The sewage grading treatment system and the sewage grading treatment method for leather production can effectively separate chromium ions, have good separation effect, greatly improve the heavy metal removal efficiency, can detect the PH value and the chromaticity at any time to adjust the working sequence of the sewage treatment system, are provided with perfect multistage sludge treatment systems, and realize thorough treatment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic sectional view of the structure of the present invention.
FIG. 2 is a schematic sectional elevation view of the filter press.
Fig. 3 is a schematic sectional front view of the dust suction pump.
Fig. 4 is an enlarged schematic view of the intelligent detector.
In the figure: 1-a stirrer; 2-ferrous sulfate storehouse; 3-a lime bin; 4-a first solenoid valve; 5-intelligent detector; 6-a second electromagnetic valve; 7-a conveying pipe; 8-a water pump; 9-a sloping plate; 10-a dust suction pump; 11-a collection chamber; 12-a sorbent tube; 13-a dechromization pool; 14-a semi-permeable membrane; 15-a first sedimentation tank; 16-anoxic pond; 17-a gas permeable tube; 18-a second sedimentation tank; 19-a water outlet; 20-a sludge storage tank; 21-gas pipe; 22-sludge pump; 23-adding an air pump; 24-a filter press; 25-a single chip microcomputer; 26-a chassis; 27-control buttons; 28-heating rod; 29-a water inlet; 30-a treatment tank; 31-dispensing boxes; 32-a medicine storage box; 33-a stirring tank; 34-a dosing chamber; 35-holes; 36-a digital screen; 37-PH sensor; 38-a viewing window; 39-an extraction port; and 40-nitrosation pool.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to 4, fig. 1 is a schematic sectional view of the structure of the present invention; FIG. 2 is a schematic sectional elevation view of the filter press; FIG. 3 is a schematic sectional elevational view of the suction pump; fig. 4 is an enlarged schematic view of the intelligent detector.
The sewage grading treatment system for leather production comprises a case 26, a single chip microcomputer 25 is arranged in the case 26, the type of the single chip microcomputer 25 can be HT66F018, a control button 27 is arranged at the top end of the case 26, a treatment tank 30 is arranged on the right side of the case 26, a water inlet 29 is formed in the left wall of the treatment tank 30, a stirrer 1 is arranged in the middle of the inside of the treatment tank 30, so that the contact area between reactants is increased, the reaction rate is improved, heating rods 28 are uniformly arranged at the bottom end of the inside of the treatment tank 30, the heating rods 28 are S-shaped, the heating area is increased, the heating efficiency is improved, a ferrous sulfate bin 2 is arranged on one side of the top end of the treatment tank 30, a lime bin 3 is arranged at the top end of the treatment tank 30 on the right side of the ferrous sulfate bin 2, a water pump 8 is arranged on the right side of the lime bin 3, and the input end of the water pump 8 is connected with the treatment tank 30, and the output of water pump 8 is provided with intelligent detection appearance 5 through the water pipe, intelligent detection appearance 5 openly one side is provided with observation window 38, be convenient for observe, it is more directly perceived, intelligent detection appearance 5 openly opposite side is provided with digital screen 36, the intelligent detection, reduce measurement personnel's work load, ensure the accuracy of testing result, intelligent detection appearance 5's right wall is provided with extraction mouth 39, intelligent detection appearance 5's inner wall is provided with PH sensor 37, this PH sensor 37's model can be BPHDJT9501, intelligent detection appearance 5 and the connecting pipe of handling between the pond 30 are provided with first solenoid valve 4, intelligent detection appearance 5 keeps away from and is provided with conveyer pipe 7 on one side of handling the pond 30, and one side of conveyer pipe 7 is provided with second solenoid valve 6.
One side that water pump 8 kept away from processing pond 30 is provided with dechromization pond 13, and the top in dechromization pond 13 is provided with dust absorption pump 10, one side of dust absorption pump 10 evenly is provided with hole 35, and hole 35's size is the same, rational in infrastructure, help the promotion of inspiratory efficiency, make absorption work ability normal clear, the output of dust absorption pump 10 is provided with collects chamber 11, and the one side of collecting chamber 11 is provided with adsorption tube 12, adsorption tube 12 passes dechromization pond 13 top and extends to inside the dechromization pond 13, the inside swash plate 9 that is provided with under adsorption tube 12 in the dechromization pond 13, swash plate 9 is embedded inside the dechromization pond 13, and swash plate 9 is 15 with the contained angle of horizontal plane, help the flow of sewage, and more reasonable in structure, inside the inlaying of swash plate 9 has pellicle 14.
The right side of chromium removal pond 13 is provided with first sedimentation tank 15 through the connecting pipe, and one side that chromium removal pond 13 was kept away from to first sedimentation tank 15 is provided with second sedimentation tank 18, be provided with nitrosation pond 40 between first sedimentation tank 15 and the second sedimentation tank 18, and one side of nitrosation pond 40 is provided with permeability cell 17, permeability cell 17 passes nitrosation pond 40 right wall and the 18 top of second sedimentation tank in proper order and extends to the 18 outsides of second sedimentation tank, permeability cell 17 is "L" shape, the delivery outlet diameter of permeability cell 17 is less than the input port diameter of permeability cell 17, prevent that external rainwater from getting into, shine into the jam, the top of nitrosation pond 40 is provided with oxygen deficiency pond 16, the right wall of second sedimentation tank 18 is provided with outlet 19.
The bottom ends of the second sedimentation tank 18 and the first sedimentation tank 15 are respectively provided with a sludge storage tank 20, the bottom ends of the first sedimentation tank 15 and the second sedimentation tank 18 are respectively provided with a sludge pump 22, the bottom end of the sludge pump 22 is provided with a filter press 24, the output end of a control button 27 is electrically connected with the input end of a singlechip 25 through a lead, the output end of a PH sensor 37 is electrically connected with the input end of the singlechip 25, the output end of the singlechip 25 is respectively and electrically connected with a first electromagnetic valve 4, a second electromagnetic valve 6 and a digital screen 36 through leads, the output end of the singlechip 25 is respectively and electrically connected with a stirrer 1, a water pump 8, a dust suction pump 10, a sludge pump 22, an air filling pump 23, the filter press 24, a heating rod 28 and a water inlet 29 through leads, the top end of the filter press 24 is provided with an air filling pump 23, the output end of the air filling pump 23 is provided with an air pipe 21, the air pipe 21 penetrates through the bottom end of the nitrosation tank 40 and extends to the inside the nitrosation tank 40, the filter press machine 24 is provided with a medicine dispensing box 31 at the top end inside thereof, a medicine storage box 32 at the bottom end inside the medicine dispensing box 31, a stirring tank 33 at the top end of the medicine storage box 32, and a medicine adding chamber 34 at the top end inside the stirring tank 33.
When the sewage treatment system provided by the embodiment of the invention is used, the integral device of the external power supply provides electric energy, sewage is injected into the treatment tank 30 through the water inlet 29, then the ferrous sulfate bin 2 is opened, ferrous sulfate in the ferrous sulfate bin 2 reacts with the sewage, the color of the sewage is clear, meanwhile, the heating rod 28 and the stirrer 1 can be started through the control button 27, the heating rod and the stirrer start working, the chemical reaction can be accelerated by heating, the contact between reactants is more sufficient after stirring, the contact area is increased, the effect of accelerating the reaction can also be achieved, the treatment process is accelerated, the color of the sewage is observed through the observation window 38 on the surface of the intelligent detector 5, when the color is clear, the lime bin 3 is opened, lime in the lime bin 3 enters the treatment tank 30, the PH is adjusted, and the pH value of the sewage can be visually known through the digital screen 36 on the intelligent detector 5 after a period of time, if the sewage does not reach the standard, the water pump 8 is started, the first electromagnetic valve 4 is opened, the second electromagnetic valve 6 is closed, the reaction is continued until the sewage meets the index, the first electromagnetic valve 4 is closed, the second electromagnetic valve 6 is opened, and the sewage is conveyed into the dechromization tank 13; after sewage enters, the sewage is left along the inclined plate 9, finally, heavy metal chromium is left on the semi-permeable membrane 14 through the semi-permeable membrane 14, the device can be closed through accumulation for a period of time, the dust suction pump 10 is opened through the control button 27, and the heavy metal is sucked into the collection cavity 11, so that chromium ions are effectively separated, the separation effect is good, and the heavy metal removal efficiency is greatly improved; the intelligent tester is arranged, the PH value and the chromaticity can be detected, the operation is simple, the observation is obvious, and the cost is saved; a perfect sludge treatment system is arranged, so that thorough treatment is realized, and the effect is obvious; then the sewage in the dechromization tank 13 enters a first sedimentation tank 15 to start to form sediment, finally the sewage is left on a sludge storage tank 20, then the sewage enters an anoxic tank 16, a reactant can be added into the anoxic tank and then flows into a nitrosation tank 40, the inside of the nitrosation tank 40 can be oxygenated by an air pump 23, so that the reaction is more thorough, then the sewage flows into a second sedimentation tank 18, after a period of time, the generated sludge is settled on the sludge storage tank 20, and the water reaching the standard is discharged through a water outlet 19; when the sludge in the sludge storage tank 20 is basically full, the sludge pump 22 should be started to lift the sludge to the filter press 24 for filtration, a Polyacrylamide (PAM) solution should be prepared first during sludge pressing, clear water is firstly filled in the stirring tank 33 during preparation, the stirrer is started, then the granular PAM stored in the medicine adding chamber 34 is very slowly added according to the concentration of about 1 percent in about half an hour, and the granular PAM is completely dissolved after about 2 hours. And (3) storing the dissolved PAM solution to a 32-agent storage tank for later use, starting a PAM metering pump when pressing sludge, and adjusting the dosage until a satisfactory effect is achieved. It should be noted that the filter press is an existing device, and the operation of the filter press is referred to the instruction manual and the manufacturer training of the filter press, as long as the same technical effect can be achieved.
The sewage grading treatment system and the sewage grading treatment method for leather production can effectively separate chromium ions, have good separation effect, greatly improve the heavy metal removal efficiency, detect the PH value and the chromaticity at any time to adjust the working sequence of the sewage treatment system, and are provided with a perfect multi-stage sludge treatment system to realize thorough treatment.
Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (1)
1. A sewage grading treatment method for leather production is characterized in that: the sewage grading treatment system for leather production comprises a case (26), a single chip microcomputer (25) is arranged inside the case (26), a control button (27) is arranged at the top end of the case (26), a treatment pool (30) is arranged on the right side of the case (26), a water inlet (29) is formed in the left wall of the treatment pool (30), a stirring machine (1) is arranged in the middle of the inside of the treatment pool (30), a ferrous sulfate bin (2) is arranged on one side of the top end of the treatment pool (30), a lime bin (3) is arranged at the top end of the treatment pool (30) on the right side of the ferrous sulfate bin (2), a water pump (8) is arranged on the right side of the treatment pool (30), the input end of the water pump (8) is connected with the treatment pool (30), and an intelligent detector (5) is arranged at the output end of the water pump (8) through a water pipe, heating rods (28) are uniformly arranged at the bottom end in the treatment tank (30), and the heating rods (28) are S-shaped;
the intelligent detection instrument (5) is provided with an extraction port (39), the inner wall of the intelligent detection instrument (5) is provided with a PH sensor (37), a connecting pipe between the intelligent detection instrument (5) and the treatment pool (30) is provided with a first electromagnetic valve (4), one side of the intelligent detection instrument (5) far away from the treatment pool (30) is provided with a conveying pipe (7), one side of the conveying pipe (7) is provided with a second electromagnetic valve (6), one side of the water pump (8) far away from the treatment pool (30) is provided with a chromium removal pool (13), the top end of the chromium removal pool (13) is provided with a dust suction pump (10), one side of the dust suction pump (10) is uniformly provided with holes (35), the holes (35) are the same in size, the output end of the dust suction pump (10) is provided with a collection cavity (11), one side of the collection cavity (11) is provided with an adsorption pipe (12), and the adsorption pipe (12) penetrates through the top end of the chromium removal pool (13) and extends to the interior of the chromium removal pool (13), an inclined plate (9) positioned right below the adsorption tube (12) is arranged in the dechromization pool (13), the inclined plate (9) is embedded in the dechromization pool (13), an included angle between the inclined plate (9) and the horizontal plane is 15 degrees, and a semipermeable membrane (14) is embedded in the inclined plate (9);
a first sedimentation tank (15) is arranged on the right side of the chromium removal tank (13) through a connecting pipe, a second sedimentation tank (18) is arranged on one side, far away from the chromium removal tank (13), of the first sedimentation tank (15), a nitrosation tank (40) is arranged between the first sedimentation tank (15) and the second sedimentation tank (18), a vent pipe (17) is arranged on one side of the nitrosation tank (40), the vent pipe (17) is inverted L-shaped, the diameter of an output port of the vent pipe (17) is smaller than that of an input port of the vent pipe (17), the vent pipe (17) sequentially penetrates through the right wall of the nitrosation tank (40) and the top end of the second sedimentation tank (18) and extends to the outside of the second sedimentation tank (18), an oxygen-deficient tank (16) is arranged at the top end of the nitrosation tank (40), and a water outlet (19) is arranged on the right wall of the second sedimentation tank (18);
the bottom ends of the second sedimentation tank (18) and the first sedimentation tank (15) are respectively provided with a sludge storage tank (20) and a sludge pump (22), the bottom end of the sludge pump (22) is provided with a filter press (24), the top end of the filter press (24) is provided with an air supply pump (23), the output end of the air supply pump (23) is provided with an air pipe (21), and the air pipe (21) penetrates through the bottom end of the nitrosation tank (40) and extends into the nitrosation tank (40);
a medicine dispensing box (31) is arranged at the top end in the filter press (24), a medicine storage box (32) is arranged at the bottom end in the medicine dispensing box (31), a stirring tank (33) is arranged at the top end of the medicine storage box (32), and a medicine feeding chamber (34) is arranged at the top end in the stirring tank (33);
the output end of the control button (27) is electrically connected with the input end of the single chip microcomputer (25) through a wire, the output end of the PH sensor (37) is electrically connected with the input end of the single chip microcomputer (25), the output end of the single chip microcomputer (25) is electrically connected with the first electromagnetic valve (4), the second electromagnetic valve (6) and the digital screen (36) through wires, and the output end of the single chip microcomputer (25) is electrically connected with the stirrer (1), the water pump (8), the dust suction pump (10), the sludge pump (22), the air entrainment pump (23), the filter press (24), the heating rod (28) and the water inlet (29) through wires;
the sewage grading treatment method for leather production comprises the following steps:
s1: injecting sewage into a treatment tank (30) through a water inlet (29), starting a ferrous sulfate bin (2), reacting ferrous sulfate in the ferrous sulfate bin (2) with the sewage, and simultaneously starting a heating rod (28) and a stirrer (1) to stir and heat the sewage;
s2: observing the color of the sewage through an observation window (38) on the surface of the intelligent detector (5), starting a lime bin (3) when the sewage is clear, adding lime in the lime bin (3) into a treatment tank (30) to react with the sewage, closing a first electromagnetic valve (4) and opening a second electromagnetic valve (6) if the pH value of the sewage reaches the standard, and conveying the sewage into a dechromization tank (13);
s3: when the sewage entering the chromium pool (13) passes through the semipermeable membrane (14), heavy metal chromium is retained on the semipermeable membrane (14), and the dust suction pump (10) is started through the control button (27) to suck the heavy metal into the collection cavity (11);
s4: the sewage enters a first sedimentation tank (15) to form sediment, finally stays on a sludge storage tank (20), the sewage which does not form the sediment enters an anoxic tank (16) and flows into a nitrosation tank (40), and the inside of the nitrosation tank (40) is oxygenated by an air pump (23), so that the sewage treatment can be continuously carried out;
s5: then the sewage flows into a second sedimentation tank (18), the generated sludge is settled on a sludge storage tank (20), and finally the water reaching the standard is discharged through a water outlet (19);
when the sludge in the sludge storage tank (20) is full, a sludge pump (22) is started to lift the sludge to a filter press (24) for filtration, a polyacrylamide solution is prepared firstly when the sludge is pressed, clear water is filled in a stirring tank (33) during the preparation, a stirrer is started, then granular PAM stored in a medicine adding chamber (34) is added very slowly according to the concentration of 1% within half an hour, the granular PAM is completely dissolved after 2 hours, the dissolved PAM solution is stored to a medicine storage tank (32) for later use, and when the sludge is pressed, a PAM metering pump is started to adjust the medicine adding amount until the satisfactory effect is achieved.
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