Integrated wastewater treatment integrated system

Abstract

The utility model relates to the technical field of wastewater treatment, and provides an integrated wastewater treatment system which comprises an acidification hydrogen peroxide tank, a first reaction tank, a drying tank, a readsorption tank, a ferrous chloride tank, a second reaction tank, a third reaction tank and a calcining tank, a discharge port of the acidified hydrogen peroxide tank is connected with a first feed port of the first reaction tank; casting waste silica sand is introduced into a second feed port of the first reaction tank, and a discharge port of the first reaction tank is respectively connected with a feed port of the drying tank and a second feed port of the second reaction tank; a gas outlet of the first reaction tank is connected with a gas inlet of the re-adsorption tank; and the discharge port of the drying pool is connected with the first feed port of the re-adsorption pool. According to the utility model, the treatment effect of various pollutants in the waste water can be improved, the regeneration of the used sand is realized, and the aims of recycling wastes and treating wastes with wastes are fulfilled.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, in particular to an integrated wastewater treatment system. Background Art

[0002] Detergents are essential household items in our daily lives, and demand for them is growing. The production of these products inevitably generates large amounts of detergent wastewater, which contains soluble substances such as surfactants, polyphosphates, bleaching agents, and animal and vegetable oils, as well as soil, short fibers, and other insoluble impurities. Large-scale discharges of these substances can have serious negative impacts on ecosystems, making the treatment of detergent wastewater a persistent challenge.

[0003] Epoxy resin production wastewater, characterized by large volumes, complex pollutant compositions, relatively high concentrations of refractory organics and toxic pollutants, difficulty in treatment, severe equipment corrosion, and high costs, has become a significant obstacle to its development. Pretreatment of epoxy resin waste with 3% hydrogen peroxide and ferrous chloride results in excess hydrogen peroxide, ferrous chloride, and the resulting ferric chloride, as well as significant amounts of sodium chloride salts. These can be reused as raw materials for Fenton reagents and coagulants, achieving both waste treatment and waste reuse.

[0004] The foundry industry, as the foundation of the machinery manufacturing industry, continues to expand. Silica sand has long been used as a molding casting material due to its excellent bonding properties with various casting binders, its wide distribution, and its high thermal conductivity. During the casting process, when silica sand is recycled to the point where it can no longer be used, it becomes waste sand. Currently, large amounts of this waste sand are primarily disposed of in piles, resulting in a waste of resources and causing serious environmental pollution. Exploring effective ways to recycle waste sand has become a key concern for the foundry industry and relevant environmental protection departments. Utility Model Content

[0005] The utility model mainly solves the technical problem in the prior art that detergent wastewater, epoxy resin production wastewater and foundry waste sand cannot be utilized, resulting in waste of resources and environmental pollution. An integrated wastewater treatment system is proposed to improve the treatment effect of various pollutants in the wastewater, which not only realizes the regeneration of old sand, but also achieves the purpose of "waste recycling" and "waste treatment with waste".

[0006] The utility model provides an integrated wastewater treatment system, comprising: an acidified hydrogen peroxide tank, a first reaction tank, a drying tank, a re-adsorption tank, a ferrous chloride tank, a second reaction tank, a third reaction tank and a calcination tank;

[0007] The discharge port of the acidified hydrogen peroxide tank is connected to the first feed port of the first reaction tank;

[0008] The second feed port of the first reaction tank is fed with foundry waste silica sand, and the discharge port of the first reaction tank is connected to the feed port of the drying tank and the second feed port of the second reaction tank respectively; the air outlet of the first reaction tank is connected to the air inlet of the re-adsorption tank;

[0009] The discharge port of the drying tank is connected to the first feed port of the re-adsorption tank;

[0010] The gas outlet and the first feed inlet of the re-adsorption tank are respectively arranged at the top thereof, and the gas inlet and the second feed inlet of the re-adsorption tank are respectively arranged at the bottom thereof;

[0011] The discharge port of the ferrous chloride tank is connected to the first feed port of the second reaction tank;

[0012] The epoxy resin wastewater is introduced into the third feed port of the second reaction tank, and the discharge port of the second reaction tank is connected to the first feed port of the third reaction tank;

[0013] The second feed port of the third reaction tank is fed with detergent wastewater, the third feed port of the third reaction tank is fed with bentonite, the discharge port of the third reaction tank is connected to the feed port of the calcination tank; the discharge port of the third reaction tank is also connected to the second feed port of the re-adsorption tank;

[0014] The gas outlet of the calcination tank is connected to the gas inlet of the re-adsorption tank.

[0015] Preferably, it also includes: a clear water tank;

[0016] The discharge port of the clean water tank is connected to the second feed port of the re-adsorption tank.

[0017] Preferably, a valve A is provided at the discharge port of the acidified hydrogen peroxide pool, a valve B is provided at the first feed port of the first reaction pool, a valve C is provided at the gas outlet of the first reaction pool, and a valve D is provided at the discharge port of the first reaction pool.

[0018] Preferably, a valve H is provided at the feed port of the drying tank, and a valve I is provided at the discharge port of the drying tank.

[0019] Preferably, a valve J is provided at the first feed port of the re-adsorption tank, a valve N is provided at the second feed port of the re-adsorption tank, a valve M is provided at the air inlet of the re-adsorption tank, and a valve K is provided at the air outlet of the re-adsorption tank.

[0020] Preferably, a valve O is provided at the discharge port of the ferrous chloride pool.

[0021] Preferably, a valve P is provided at the first feed inlet of the second reaction tank, a valve Y is provided at the second feed inlet of the second reaction tank, and a valve Q is provided at the discharge port of the second reaction tank.

[0022] Preferably, a valve R is provided at the first feed port of the third reaction tank, and a valve S is provided at the discharge port of the third reaction tank.

[0023] Preferably, a valve V is provided at the feed port of the calcining pool, a valve W is provided at the gas outlet of the calcining pool, and a valve X is provided at the discharge port of the calcining pool.

[0024] Preferably, a valve Z is provided at the discharge port of the clear water tank.

[0025] The utility model provides an integrated wastewater treatment system with the functions of old sand regeneration, pretreatment of epoxy resin wastewater, pretreatment of detergent wastewater, bentonite recovery, re-adsorption, air flushing and water flushing. The old sand regeneration function is to oxidize and acidify the discarded foundry silica sand, filter and dry it to obtain regenerated silica sand. The epoxy resin wastewater pretreatment function is to reuse the wastewater after the old sand regeneration, add ferrous chloride, and establish a "Fenton + coagulation" dual system to pretreat the epoxy resin wastewater. The detergent wastewater pretreatment function is to reuse the wastewater after the old sand regeneration and epoxy resin wastewater pretreatment, and add bentonite to establish a "Fenton + coagulation + adsorption" triple system to pretreat the detergent wastewater. The bentonite recovery function is to calcine the waste residue to 400 degrees Celsius under normal pressure, calcine the residual organic matter, and obtain bentonite for recycling. The re-adsorption function is to use the regenerated silica sand to fully adsorb the wastewater generated after the detergent wastewater pretreatment for a second time through air flushing and water flushing. The water flushing function is to use pre-treated wastewater or clean water from the clean water tank to backwash the device from bottom to top, so as to achieve full adsorption, and the flushed water enters the main drainage. The air flushing function is to use the gas generated in the first reaction tank, the second reaction tank and the calcination tank to blow into the bottom. The bubbles rise in the water and drive the filter material, rolling up and down, increasing the contact area, and making it more fully contacted and adsorbed. The utility model effectively improves the treatment effect of various pollutants in the wastewater, not only realizes the regeneration of old sand, but also achieves the effects of "waste recycling" and "waste treatment", improves the treatment effect of various pollutants in the wastewater, saves resources and reduces environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural diagram of the integrated wastewater treatment system provided by the utility model.

[0027] Figure numerals: 1. Acidified hydrogen peroxide tank; 2. First reaction tank; 3. Drying tank; 4. Re-adsorption tank; 5. Ferrous chloride tank; 6. Second reaction tank; 7. Third reaction tank; 8. Calcination tank; 9. Clear water tank. DETAILED DESCRIPTION

[0028] To make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, rather than all of its contents.

[0029] like Figure 1 As shown, an integrated wastewater treatment system provided by an embodiment of the present invention includes: an acidified hydrogen peroxide tank 1, a first reaction tank 2, a drying tank 3, a re-adsorption tank 4, a ferrous chloride tank 5, a second reaction tank 6, a third reaction tank 7 and a calcination tank 8.

[0030] The discharge port of the acidified hydrogen peroxide tank 1 is connected to the first feed port of the first reaction tank 2;

[0031] The second feed port of the first reaction tank 2 is fed with foundry waste silica sand, and the discharge port of the first reaction tank 2 is connected to the feed port of the drying tank 3 and the second feed port of the second reaction tank 6 respectively; the air outlet of the first reaction tank 2 is connected to the air inlet of the re-adsorption tank 4;

[0032] The discharge port of the drying tank 3 is connected to the first feed port of the re-adsorption tank 4;

[0033] The gas outlet and the first feed port of the re-adsorption tank 4 are respectively arranged at the top thereof, and the gas inlet and the second feed port of the re-adsorption tank 4 are respectively arranged at the bottom thereof;

[0034] The discharge port of the ferrous chloride pool 5 is connected to the first feed port of the second reaction pool 6;

[0035] The third feed port of the second reaction tank 6 is fed with epoxy resin wastewater, and the discharge port of the second reaction tank (6) is connected to the first feed port of the third reaction tank 7;

[0036] The second feed port of the third reaction tank 7 is fed with detergent wastewater, the third feed port of the third reaction tank 7 is fed with bentonite, the discharge port of the third reaction tank 7 is connected to the feed port of the calcination tank 8; the discharge port of the third reaction tank 7 is also connected to the second feed port of the re-adsorption tank 4;

[0037] The gas outlet of the calcination tank 8 is connected to the gas inlet of the re-adsorption tank 4 .

[0038] The integrated wastewater treatment system further includes: a clear water tank 9 ; the discharge port of the clear water tank 9 is connected to the second feed port of the re-adsorption tank 4 .

[0039] In the present invention, the discharge port of the acidified hydrogen peroxide tank 1 is provided with a valve A, the first feed port of the first reaction tank 2 is provided with a valve B, the air outlet of the first reaction tank 2 is provided with a valve C, and the discharge port of the first reaction tank 2 is provided with a valve D. The feed port of the drying tank 3 is provided with a valve H, and the discharge port of the drying tank 3 is provided with a valve I. The first feed port of the re-adsorption tank 4 is provided with a valve J, the second feed port of the re-adsorption tank 4 is provided with a valve N, the air inlet of the re-adsorption tank 4 is provided with a valve M, and the air outlet of the re-adsorption tank 4 is provided with a valve K. The discharge port of the ferrous chloride tank 5 is provided with a valve O. The first feed port of the second reaction tank 6 is provided with a valve P, the second feed port of the second reaction tank 6 is provided with a valve Y, and the discharge port of the second reaction tank 6 is provided with a valve Q. The first feed port of the third reaction tank 7 is provided with a valve R, and the discharge port of the third reaction tank 7 is provided with a valve S. The feed port of the calcining pool 8 is provided with a valve V, the gas outlet of the calcining pool 8 is provided with a valve W, the discharge port of the calcining pool 8 is provided with a valve X. The discharge port of the clear water pool 9 is provided with a valve Z.

[0040] The working process of the integrated wastewater treatment system provided by this utility model is as follows:

[0041] The acidified hydrogen peroxide tank 1, the first reaction tank 2 and the drying tank 3 realize the old sand regeneration function: first, raw materials (3% H2O2 and HCl mixture) are added to the acidified hydrogen peroxide tank 1, valves A and B are opened, and after the acidified hydrogen peroxide tank 1 adds the H2O2 and HCl mixture into the first reaction tank 2, valves A and B are closed, and then foundry waste silica sand is added to the first reaction tank 2, and valve C is opened (to allow the gas generated in the first reaction tank 2 to pass into the re-adsorption tank 4); after oxidation and acidification in the first reaction tank 2, the mixture is allowed to stand and stratify, and valves D, F and H are opened to separate the precipitate into the drying tank 3 for drying to obtain regenerated silica sand.

[0042] The first reaction tank 2, the ferrous chloride tank 5, and the second reaction tank 6 realize the function of pre-treating epoxy resin wastewater: first, add epoxy resin wastewater to the second reaction tank 6, open valve D, valve G, and valve Y, and discharge the wastewater in the first reaction tank 2 into the second reaction tank 6. After the discharge is completed, close valve D and open valve O and valve P. The ferrous chloride tank 5 adds ferrous chloride to the second reaction tank 6. After the feeding is completed, close valve O and valve P, and open valve E (when the valve D is opened next time, it needs to be closed in advance, and then opened again after closing valve D, so that the gas generated in the second reaction tank 6 can pass into the re-adsorption tank 4), so that the gas enters 4. At this time, the solution in the second reaction tank 6 uses the effective components of the wastewater in the first reaction tank 2 and ferrous chloride as raw materials to form a "Fenton + coagulation" dual system to oxidize and precipitate organic matter and other wastes, thereby realizing the pretreatment of epoxy resin wastewater.

[0043] The second reaction tank 6 and the third reaction tank 7 realize the function of pre-treating detergent wastewater: first, open valves Q and valve R to discharge the waste in the second reaction tank 6 into the third reaction tank 7. After the discharge is completed, close valves Q and valve R, and then add detergent wastewater and bentonite (the bentonite produced in the calcination tank 8 can be used here) into the third reaction tank 7. At this time, the third reaction tank 7 uses the effective ingredients in the second reaction tank 6 and the bentonite modified with the surfactant to form a "Fenton + coagulation + adsorption" three-system to oxidize, precipitate and adsorb organic matter, etc., to achieve pretreatment of detergent wastewater.

[0044] The third reaction tank 7 and calcination tank 8 perform bentonite recovery. First, the waste from the third reaction tank 7 is allowed to stand for stratification. Valves S, U, and V are then opened to release the precipitate into the calcination tank 8. Valve W is then opened (allowing the gas generated in the calcination tank 8 to flow into the re-adsorption tank 4). After calcination is complete, the bentonite is recovered. The waste liquid generated by stratification in the third reaction tank 7 can be passed into the re-adsorption tank 4.

[0045] The re-adsorption tank 4, the drying tank 3, and the third reaction tank 7 realize the re-adsorption function: first, open valve I and valve J, and put the regenerated silica sand produced in the drying tank 3 into the re-adsorption tank 4, open valve N, valve T, and valve S, and put the waste liquid produced in the third reaction tank 7 into the re-adsorption tank 4. After the input is completed, close valve S and valve T, open valve Z, valve M, valve L, and valve K, and the gas produced by the reaction is discharged through valve K. After complete adsorption, close valve K, open valve L, and discharge the waste produced after re-adsorption through valve L.

[0046] Valve M is an air flush valve. The gas generated by the first reaction tank 2, the second reaction tank 6, and the calcination tank 8 is blown into the bottom of the re-adsorption tank 4 through the air flush valve. The bubbles rise in the water and drive the filter material to roll up and down, increasing the contact area and making it more fully contacted and adsorbed. The water after flushing enters the total drainage for further full adsorption.

[0047] Valve N is a water flush valve. This utility model can implement two water flushing processes. The first water flushing process is to use the waste liquid in the third reaction tank 7 to pass into the bottom of the re-adsorption tank 4, and use the waste water to backwash the device from bottom to top to achieve sufficient adsorption. The second water flushing process is when the equipment and regenerated silica sand need to be flushed after the equipment has been running for a period of time. The water in the clean water tank 9 is used to backwash the device from bottom to top to achieve sufficient adsorption.

[0048] The main purpose of air flushing and water flushing is to increase the contact area between organic matter and other wastes in the wastewater and the regenerated silica sand for full adsorption.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications to the technical solutions described in the above embodiments, or equivalent replacement of some or all of the technical features therein, do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated wastewater treatment system, characterized in that: include: Acidified hydrogen peroxide tank (1), first reaction tank (2), drying tank (3), re-adsorption tank (4), ferrous chloride tank (5), second reaction tank (6), third reaction tank (7) and calcination tank (8); The discharge port of the acidified hydrogen peroxide tank (1) is connected to the first feed port of the first reaction tank (2); The second feed port of the first reaction tank (2) is fed with foundry waste silica sand, and the discharge port of the first reaction tank (2) is connected to the feed port of the drying tank (3) and the second feed port of the second reaction tank (6) respectively; the air outlet of the first reaction tank (2) is connected to the air inlet of the re-adsorption tank (4); The discharge port of the drying tank (3) is connected to the first feed port of the re-adsorption tank (4); The gas outlet and the first feed inlet of the re-adsorption tank (4) are respectively arranged at the top thereof, and the gas inlet and the second feed inlet of the re-adsorption tank (4) are respectively arranged at the bottom thereof; The discharge port of the ferrous chloride tank (5) is connected to the first feed port of the second reaction tank (6); The third feed port of the second reaction tank (6) is fed with epoxy resin wastewater, and the discharge port of the second reaction tank (6) is connected to the first feed port of the third reaction tank (7); The second feed port of the third reaction tank (7) is fed with detergent wastewater, the third feed port of the third reaction tank (7) is fed with bentonite, the discharge port of the third reaction tank (7) is connected to the feed port of the calcination tank (8); the discharge port of the third reaction tank (7) is also connected to the second feed port of the re-adsorption tank (4); The gas outlet of the calcination tank (8) is connected to the gas inlet of the re-adsorption tank (4).

2. The integrated wastewater treatment system according to claim 1, characterized in that: Also includes: clear pool(9); The discharge port of the clean water tank (9) is connected to the second feed port of the re-adsorption tank (4).

3. The integrated wastewater treatment system according to claim 1, characterized in that: The discharge port of the acidified hydrogen peroxide tank (1) is provided with a valve A, the first feed port of the first reaction tank (2) is provided with a valve B, the gas outlet of the first reaction tank (2) is provided with a valve C, and the discharge port of the first reaction tank (2) is provided with a valve D.

4. The integrated wastewater treatment system according to claim 1, characterized in that: The feed port of the drying tank (3) is provided with a valve H, and the discharge port of the drying tank (3) is provided with a valve I.

5. The integrated wastewater treatment system according to claim 1, characterized in that: The first feed port of the re-adsorption tank (4) is provided with a valve J, the second feed port of the re-adsorption tank (4) is provided with a valve N, the air inlet of the re-adsorption tank (4) is provided with a valve M, and the air outlet of the re-adsorption tank (4) is provided with a valve K.

6. The integrated wastewater treatment system according to claim 1, characterized in that: The discharge port of the ferrous chloride pool (5) is provided with a valve O.

7. The integrated wastewater treatment system according to claim 1, characterized in that: The first feed port of the second reaction tank (6) is provided with a valve P, the second feed port of the second reaction tank (6) is provided with a valve Y, and the discharge port of the second reaction tank (6) is provided with a valve Q.

8. The integrated wastewater treatment system according to claim 1, characterized in that: A valve R is provided at the first feed port of the third reaction tank (7), and a valve S is provided at the discharge port of the third reaction tank (7).

9. The integrated wastewater treatment system according to claim 1, characterized in that: The feed port of the calcining pool (8) is provided with a valve V, the gas outlet of the calcining pool (8) is provided with a valve W, and the discharge port of the calcining pool (8) is provided with a valve X.

10. The integrated wastewater treatment system according to claim 2, characterized in that: A valve Z is provided at the discharge port of the clear water tank (9).

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