Integrated treatment device for leather wastewater

Abstract

The utility model belongs to a sewage treatment device, and particularly relates to an integrated leather wastewater treatment device. Comprising an adjusting tank connected with a water inlet end of equipment through a filter, a material input end of a biochemical tank consisting of an anaerobic tank and an aerobic tank is connected with a material output end of the adjusting tank through a hydrolysis acidification tank, and a sludge output end of the biochemical tank is connected with a sludge tank; the output end of the chemical adding device is respectively connected with the chemical input ends of the hydrolysis acidification pool and the biochemical pool, the material input end of the air flotation separator is connected with the material output end of the regulating pool, the material output end of the air flotation separator is connected with the hydrolysis acidification pool, the sludge output end at the bottom of the air flotation separator is connected with the sludge pool, and the sludge pool is connected with the water tank. The device further comprises an ultrafiltration membrane and an advanced oxidation tower. The leather wastewater treatment device effectively solves the problems of large limitation, difficulty in reaching the standard of wastewater treatment and the like in the prior art, and has the advantages of effectively reducing biochemical treatment load, ensuring deep purification of leather wastewater and the like.

Description

Technical Field

[0001] This utility model pertains to wastewater treatment devices, and specifically refers to an integrated treatment device for leather wastewater. Background Technology

[0002] Leather wastewater is highly polluting industrial wastewater generated during leather processing, mainly originating from dyeing, pretreatment, and tanning processes. Its composition is complex, containing pollutants such as dyes, surfactants, heavy metals, proteins, and oils. It is characterized by high COD, high color intensity, complex composition, and significant heavy metal toxicity. Untreated discharge will pollute water bodies and soil, threatening ecosystems and human health.

[0003] Traditional methods for treating leather wastewater mostly rely on biological treatment, which has significant limitations, and the treated wastewater often fails to meet discharge standards.

[0004] The applicant has not found any patent literature reports related to this application in domestic patent databases. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated treatment device for leather wastewater. By rationally setting up air flotation, biochemical, ultrafiltration and advanced oxidation functional units, the treated wastewater can easily meet the testing requirements.

[0006] The overall technical concept of this utility model is:

[0007] An integrated leather wastewater treatment device includes an equalization tank connected to the equipment inlet via a filter; a material input end of a biological treatment tank connected to the equalization tank's material output end via a hydrolysis acidification tank; and a sludge output end of the biological treatment tank connected to a sludge tank. The output end of a dosing device is connected to the reagent input ends of both the hydrolysis acidification tank and the biological treatment tank. Wherein:

[0008] a. The biological treatment tank includes anaerobic tanks and aerobic tanks that are connected to each other.

[0009] b. It also includes an air flotation separator, the material input end of which is connected to the material output end of the equalization tank, the material output end of which is connected to the hydrolysis acidification tank, and the sludge output end at the bottom of the air flotation separator is connected to the sludge tank.

[0010] c. It also includes an ultrafiltration membrane and an advanced oxidation tower. The wastewater output after treatment in the biological treatment tank is connected to the material input end of the ultrafiltration membrane. The concentrate output of the ultrafiltration membrane is connected to the aerobic tank. There are two outputs of the ultrafiltration membrane. One output that passes the product water test is connected to the discharge end, and the other output that fails the product water test is connected to the material input end of the advanced oxidation tower. The material output of the advanced oxidation tower, after passing the test, is connected to the discharge end.

[0011] The ultrafiltration membrane in this invention is an external tubular ultrafiltration membrane made of polyvinylidene fluoride (PVDF), which is resistant to strong acids and alkalis. The membrane's operating flux is greater than 500 L / (m³). 2 The membrane can handle water volume surges under extreme conditions; it can withstand wastewater with suspended solids concentrations up to 20,000 mg / L and has strong adaptability; the membrane has a fine microporous structure and can retain pollutants of 25 nm and above, meeting high-standard water treatment requirements; compared with conventional ultrafiltration, the external tubular ultrafiltration membrane reduces the floor space by 40% to 60%.

[0012] The specific technical concept of this utility model also includes:

[0013] To facilitate effective treatment of wastewater in sludge and reduce the emission of harmful substances and the workload of post-treatment, a preferred technical approach is to have two output ends for the sludge output from the sludge tank after filter pressing: the solid output is connected to the external transport end, and the liquid material output is connected to the material input end of the equalization tank.

[0014] To ensure the effective operation of the advanced oxidation tower, the preferred technical approach is to connect the output of the ozone generator to the advanced oxidation tower.

[0015] The main function of the dosing device is to provide chemicals to the biological treatment tank and the hydrolysis acidification tank. The dosing device includes a sodium carbonate reagent tank, a carbon source reagent tank, and a polyaluminum chloride reagent tank. The material output end of the carbon source reagent tank is connected to the anaerobic tank, the material output end of the polyaluminum chloride reagent tank is connected to the aerobic tank, and the material output end of the sodium carbonate reagent tank is connected to the hydrolysis acidification tank.

[0016] To facilitate the delivery of the reagents, the preferred technical means is to equip the material output end of the sodium carbonate reagent tank, carbon source reagent tank, and polyaluminum chloride reagent tank with a dosing pump.

[0017] To ensure dissolved oxygen levels in the aerobic tank and accelerate the degradation and removal of pollutants, a preferred technical approach is to include an air pump located outside the biological tank, with the output end of the air pump connected to an aeration pipe installed inside the aerobic tank, where suspended packing material is provided.

[0018] To facilitate sludge transport, the preferred technical approach is to install sludge discharge pumps at the sludge output end of the air flotation separator and the sludge output end of the biological treatment tank.

[0019] To facilitate material transport, lift pumps are installed at the material output ends of the equalization tank, the air flotation separator, the hydrolysis acidification tank, and the wastewater output end of the biochemical tank.

[0020] To facilitate material circulation within the ultrafiltration membrane, a preferred technical approach is to install a circulation pump outside the ultrafiltration membrane.

[0021] To facilitate material transport control based on whether the produced water output is qualified, the preferred technical approach is to have two produced water outputs from the ultrafiltration membrane, which are switched and controlled by valves.

[0022] To reduce energy consumption while ensuring stable equipment operation, a preferred technical approach is for the photovoltaic panels to power the ozone generator and / or pumping device and / or filter press via batteries.

[0023] The applicant needs to explain that:

[0024] In the description of this utility model, the terms "input," "output," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the purpose of simplifying the description of this utility model, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," "third," and "fourth" are only used to indicate distinction and should not be construed as implying importance.

[0025] The technological advancements achieved by this utility model are as follows:

[0026] 1. This utility model adds an air flotation separator before the biological treatment tank, which can remove suspended solids, grease and other pollutants through bubble adsorption, reduce COD and SS concentrations and assist in the removal of heavy metals, thereby reducing the load on biological treatment.

[0027] 2. This utility model adds an advanced oxidation tower after the biochemical unit, which uses hydroxyl radicals generated by ozone catalytic oxidation to degrade organic matter, decolorize and oxidize heavy metals, effectively ensuring that the leather wastewater is deeply purified to meet the standards.

[0028] 3. After sludge is filtered, the liquid material is returned to the equalization tank, which can reduce the emission of harmful substances and the amount of post-treatment work.

[0029] 4. This invention creatively applies an external tubular ultrafiltration membrane for the first time to treat leather wastewater. This membrane is resistant to strong acids and alkalis, can cope with surges in water volume under extreme conditions, has strong adaptability, and can meet high-standard water treatment requirements; compared to conventional ultrafiltration, it reduces the floor space by 40% to 60%.

[0030] 5. The adoption of photovoltaic power supply devices saves energy consumption while ensuring the effective operation of the equipment. Attached Figure Description

[0031] The accompanying drawings of this utility model are as follows:

[0032] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0033] The reference numerals in the attached figures are as follows:

[0034] 1. Equipment inlet pipe; 2. Filter; 3. Equalization tank; 4. First lift pump; 5. Air flotation separator; 6. Second lift pump; 7. First sludge discharge pump; 8. Hydrolysis acidification tank; 9. Third lift pump; 10. Biological tank; 10A. Anaerobic tank; 10B. Aerobic tank; 11. Fourth lift pump; 12. Second sludge discharge pump; 13. Suspended packing; 14. Air pump; 15. Aeration pipe; 16. Circulation pump; 17. Ultrafiltration membrane; 18. Valve; 19. Advanced oxidation tower; 20. Ozone generator; 21. Sludge tank; 22. Sludge pump; 23. Plate and frame filter press; 24. Sodium carbonate reagent tank; 25. First dosing pump; 26. Carbon source reagent tank; 27. Second dosing pump; 28. Polyaluminum chloride reagent tank; 29. ​​Third dosing pump; 30. Photovoltaic panel; 31. Battery. Detailed Implementation

[0035] The present invention will be further described below with reference to the embodiments, but it should not be construed as a limitation of the present invention. The protection scope of the present invention shall be determined by the contents of the claims. Any equivalent technical means substitution made in accordance with the specification shall not depart from the protection scope of the present invention.

[0036] Example

[0037] The overall structure of this embodiment is as follows: Figure 1 As shown, the integrated leather wastewater treatment device includes an equalization tank 3 connected to the equipment inlet pipe 1 via a filter 2. The material output end of the equalization tank 3 is connected to the material input end of the air flotation separator 5 via a first lift pump 4. The material output end of the air flotation separator 5 is connected to the hydrolysis acidification tank 8 via a second lift pump 6. The sludge output end at the bottom of the air flotation separator 5 is connected to the sludge tank 21 via a first sludge discharge pump 7. The material output end of the hydrolysis acidification tank 8 is connected to the anaerobic tank 10A in the biological treatment tank 10 via a third lift pump 9. The biological treatment tank 10 includes interconnected anaerobic tanks 10A. The system includes an aerobic tank 10B; an anaerobic tank 10A serves as the material input of the biological treatment tank 10, and an aerobic tank 10B serves as the material output of the biological treatment tank 10. The wastewater output of the aerobic tank 10B is connected to the material input of the ultrafiltration membrane 17 via a fourth lift pump 11. The sludge output from the bottom of the aerobic tank 10B is connected to the sludge tank 21 via a second sludge discharge pump 12. The ultrafiltration membrane 17 is externally equipped with a circulation pump 16 for material circulation. The concentrated water output of the ultrafiltration membrane 17 is connected to the aerobic tank 10B. The permeate output of the ultrafiltration membrane 17 has two paths, which are switched and controlled by a valve 18. One path of permeate output that passes the test is connected to the discharge end, and the other path of permeate output that fails the test is connected to the material input of the advanced oxidation tower 19. The material output of the advanced oxidation tower 19, after passing the test, is connected to the discharge end.

[0038] The dosing device includes a sodium carbonate reagent tank 24, a carbon source reagent tank 26, and a polyaluminum chloride reagent tank 28. The material output end of the carbon source reagent tank 26 is connected to the anaerobic tank 10A through a second dosing pump 27. The material output end of the polyaluminum chloride reagent tank 28 is connected to the aerobic tank 10B through a third dosing pump 29. The material output end of the sodium carbonate reagent tank 24 is connected to the hydrolysis acidification tank 8 through a first dosing pump 25.

[0039] The sludge output from sludge tank 21 has two output ends after passing through sludge pump 22 and plate and frame filter press 23. The solid material output is connected to the external transportation end, and the liquid material output is connected to the material input end of equalization tank 3.

[0040] The output of ozone generator 20 is connected to advanced oxidation tower 19.

[0041] It also includes an air pump 14 located outside the biological tank 10. The output end of the air pump 14 is connected to the aeration pipe 15 installed inside the aerobic tank 10B. The aerobic tank 10B is equipped with suspended packing material 13.

[0042] The photovoltaic panel 30 supplies power to the ozone generator 20, sludge pump, lift pump, plate and frame filter press, and circulation pump via the battery 31.

Claims

1. An integrated treatment device for leather wastewater, comprising an equalization tank (3) connected to the inlet of the equipment via a filter (2), a material input end of a biochemical tank (10) connected to the material output end of the equalization tank (3) via a hydrolysis acidification tank (8), and a sludge output from the biochemical tank (10) connected to a sludge tank (21); the output end of a dosing device is connected to the reagent input ends of the hydrolysis acidification tank (8) and the biochemical tank (10), respectively; characterized in that: a. The biological treatment tank (10) includes an anaerobic tank (10A) and an aerobic tank (10B) that are connected to each other; b. It also includes an air flotation separator (5), the material input end of the air flotation separator (5) is connected to the material output end of the equalization tank (3), the material output end of the air flotation separator (5) is connected to the hydrolysis acidification tank (8), and the sludge output end at the bottom of the air flotation separator (5) is connected to the sludge tank (21). c. It also includes an ultrafiltration membrane (17) and an advanced oxidation tower (19). The wastewater output after treatment in the biological treatment tank (10) is connected to the material input end of the ultrafiltration membrane (17). The concentrated water output of the ultrafiltration membrane (17) is connected to the aerobic tank (10B). The ultrafiltration membrane (17) has two outputs of permeate. One output that passes the permeate test is connected to the discharge end, and the other output that fails the permeate test is connected to the material input end of the advanced oxidation tower (19). The material output of the advanced oxidation tower (19) is connected to the discharge end after passing the test.

2. The integrated leather wastewater treatment device according to claim 1, characterized in that... The sludge output of the sludge tank (21) has two output ends after filtration. The solid output is connected to the external transport end, and the liquid output is connected to the material input end of the equalization tank (3).

3. The integrated leather wastewater treatment device according to claim 1, characterized in that... The output of the ozone generator (20) is connected to the advanced oxidation tower (19).

4. The integrated leather wastewater treatment device according to claim 1, characterized in that... The dosing device includes a sodium carbonate reagent tank (24), a carbon source reagent tank (26), and a polyaluminum chloride reagent tank (28). The material output end of the carbon source reagent tank (26) is connected to the anaerobic tank (10A), the material output end of the polyaluminum chloride reagent tank (28) is connected to the aerobic tank (10B), and the material output end of the sodium carbonate reagent tank (24) is connected to the hydrolysis acidification tank (8).

5. The integrated leather wastewater treatment device according to claim 1, characterized in that... It also includes an air pump (14) located outside the biological tank (10), the output end of which is connected to an aeration pipe (15) installed in the aerobic tank (10B), and a suspended packing material (13) is installed in the aerobic tank (10B).

6. The integrated leather wastewater treatment device according to claim 1, characterized in that... Pumping devices are provided at the material output end of the equalization tank (3), the material output end and sludge output end of the air flotation separator (5), the material output end of the hydrolysis acidification tank (8), the wastewater output end and sludge output end of the biochemical tank (10), the output end of the dosing device, the material input end and the product water output end of the ultrafiltration membrane (17), and the sludge output end of the sludge tank (21).

7. The integrated leather wastewater treatment device according to any one of claims 1 to 6, characterized in that... The photovoltaic panel (30) powers the ozone generator (20) and / or the pumping device and / or the filter press via the battery (31).

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