Re-filtration equipment for iron-containing sludge wastewater produced by Fenton reaction

Abstract

The invention provides re-filtration equipment for iron-containing sludge wastewater produced by Fenton reaction, a water distribution system is used for uniformly distributing inlet water, the water is flocculated wastewater and enables the flocculated wastewater to automatically flow into a filtration system, the filtration system comprises a transmission device, the transmission device comprises a driving wheel, a driven wheel and a belt, and the belt is connected with the driving wheel and the driven wheel. Rotating shafts of the driving wheel and the driven wheel are parallel to the ground, the water distribution system is located above the transmission device, the movement direction of the top edge of the driving wheel in the transmission device during rotation is recorded as the conveying direction of the belt, and the conveying direction of the belt is opposite to the water incoming direction of the water distribution system during working; first HIW filter cloth is arranged on the belt, and the first HIW filter cloth is high-hydrophilic filter cloth and is made of a hydrophilic material. The re-filtration equipment solves the problem that iron-containing sludge wastewater is flocculent and is not separated, saves the medicament cost, improves the convenience of field operation, saves the manufacturing cost and occupied area of a sludge system, can operate automatically, and is low in investment cost, low in operation cost and simple and convenient in field operation management.

Description

Technical Field

[0001] The invention belongs to the technical field of filtering equipment, and in particular relates to a heavy filtering device for iron-containing mud wastewater produced by Fenton reaction. Background Art

[0002] In the process of water treatment, the Fenton process is often used to remove refractory organic matter. Hydrogen peroxide (H2O2) reacts with the catalyst ferrous ions (Fe 2+ ) can generate highly oxidizing hydroxyl radicals (·OH), which can non-selectively oxidize most organic matter in water by utilizing their high oxidation potential and electron affinity.

[0003] During the Fenton reaction, the pH needs to be adjusted to acidic conditions to ensure the stability of the Fenton reagent and the reaction effect. After the advanced oxidation is completed, the pH is adjusted back to alkaline to allow the ferrous ions to form ferric hydroxide (Fe(OH)3) and ferric oxide (Fe2O3) precipitation. The precipitate is flocculent, which is not conducive to the separation of precipitation. Usually, polyacrylamide (PAM) needs to be added for flocculation, and PAM is easily hydrolyzed under high pH conditions, which affects the precipitation effect. At the same time, the dosage of ferrous ions, hydrogen peroxide, and PAM in the Fenton reaction and the reaction pH conditions have a great influence on the overall oxidation reaction and precipitation effect. Therefore, a large number of orthogonal tests are required to determine the dosage of the reagent. At the same time, due to the uneven composition and quality of various reagents, the iron sludge after the Fenton reaction is often difficult to settle, and the effluent contains a large amount of iron ions, which has a great impact on the subsequent biochemical treatment process. In actual operation, high quality requirements are placed on on-site management and operation personnel. Summary of the invention

[0004] In view of the above problems, the present invention provides a re-filtration device for iron-containing sludge wastewater produced by Fenton reaction.

[0005] The re-filtration equipment for iron-containing sludge wastewater produced by Fenton reaction provided by the present invention comprises: a water distribution system, a filtration system,

[0006] in,

[0007] The water distribution system is used to evenly distribute the incoming water, which is flocculated wastewater, and allows the flocculated wastewater to flow into the next system, namely the filtration system;

[0008] The filtering system comprises a transmission device, which comprises a driving wheel connected to a motor, a driven wheel, and a belt that cooperates with the driving wheel and the driven wheel and is used for transmission. The rotating shafts of the driving wheel and the driven wheel are parallel to the ground. The water distribution system is located above the transmission device. The movement direction of the top edge of the driving wheel in the transmission device when rotating is the transmission direction of the belt. When working, the transmission direction of the belt is opposite to the water inflow direction of the water distribution system. A first HIW filter cloth is arranged on the belt, and the first HIW filter cloth is a highly hydrophilic filter cloth made of hydrophilic material.

[0009] further,

[0010] The water distribution system includes an inlet water distribution trough, and the inlet water distribution trough is used to evenly distribute the inlet water;

[0011] The water outlet slot of the water inlet distribution slot is located above the transmission device. When working, the conveying direction of the belt is opposite to the incoming water direction in the water outlet slot of the water inlet distribution slot.

[0012] further,

[0013] A driven mud pressing roller, i.e., a filter pressing wheel, is arranged at the conveying end of the belt, so that when the iron mud accumulated on the first HIW filter cloth passes through the conveying end, the iron mud is pressed and filtered by the filter pressing wheel to further dehydrate it and reduce the volume of the iron mud.

[0014] further,

[0015] It comprises a skimming plate adjacent to the transmission end and a sludge discharge system, and the iron sludge after filter pressing enters the sludge discharge system through the skimming plate.

[0016] further,

[0017] The sludge discharge system comprises a flocculation tank, and the flocculation tank is located at the lower end of the skimmer plate.

[0018] further,

[0019] A shaftless screw conveyor is installed in the sludge tank to convey the iron sludge after filter pressing. The iron sludge after filter pressing is conveyed to the sludge treatment system through the sludge collecting tank for further dehydration.

[0020] further,

[0021] The bottom of the sludge tank is paved with a second HIW filter cloth, which is a highly hydrophilic filter cloth made of hydrophilic material.

[0022] further,

[0023] The filter diameters of the first HIW filter cloth and the second HIW filter cloth are both less than 200 μm.

[0024] further,

[0025] The bottom of the sludge tank below the second HIW filter cloth is provided with perforations;

[0026] A water collecting tank is provided below the bottom of the sludge tank.

[0027] further,

[0028] It also includes a flushing system, which includes a high-pressure flushing pipe. The high-pressure flushing pipe is located above the heavy filtration equipment. The first HIW filter cloth and / or the second HIW filter cloth are flushed regularly or manually by passing compressed air or high-pressure water into the high-pressure flushing pipe.

[0029] The re-filtration equipment for iron-containing sludge wastewater produced by Fenton reaction provided by the present invention has the following advantages or beneficial effects:

[0030] 1. The separation effect of iron-containing sludge wastewater is significantly higher than coagulation and sedimentation, which solves the pain point of flocculent and non-separable iron-containing sludge wastewater;

[0031] 2. The amount of PAM reagent used in Fenton reaction is significantly reduced, saving reagent costs;

[0032] 3. It reduces the requirements for fine adjustment of alkali in Fenton reaction, and allows excessive addition of alkali without considering the problem of PAM hydrolysis, thus improving the convenience of on-site operation;

[0033] 4. The iron sludge after filtration does not need to be concentrated and can be directly sent to the sludge treatment terminal, saving the cost and land occupation of the sludge system;

[0034] 5. The whole set of equipment can realize automatic operation without human supervision;

[0035] 6. Ensure the effluent quality and improve the treatment effect of the subsequent biochemical system;

[0036] 7. The iron-containing mud wastewater produced by Fenton reaction can be gravity filtered through the equipment to achieve the effect of mud-water separation;

[0037] 8. The heavy filtration equipment has low investment cost, low operating cost, and simple and convenient on-site operation and management.

[0038] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A cross-sectional view of a re-filtration device for iron-containing sludge wastewater produced by Fenton reaction according to an embodiment of the present invention is shown;

[0041] Figure 2 The upper plane diagram of the heavy filtration equipment for iron-containing mud wastewater produced by Fenton reaction according to an embodiment of the present invention is shown;

[0042] Figure 3 A middle-level plan view of a re-filtration device for iron-containing sludge wastewater produced by Fenton reaction according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", "third", etc. in the specification and claims of this application or the above-mentioned figures are used to distinguish different objects, not to describe a specific order or a primary and secondary relationship. "Multiple" appearing in this application refers to more than two (including two).

[0045] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] Figure 1 , Figure 2 and Figure 3 The cross-sectional view, upper plan view and middle plan view of the heavy filtration equipment for iron-containing sludge wastewater produced by Fenton reaction provided by the present invention are respectively shown. Figures 1 to 3 The re-filtration equipment for iron-containing sludge wastewater produced by Fenton reaction includes a water distribution system, a filtration system, a sludge discharge system and a flushing system.

[0047] The water distribution system includes a water inlet distribution trough. In order to achieve uniform distribution of the flocculated wastewater after the Fenton reaction on the HIW filter cloth (highly hydrophilic high speed filter cloth) to achieve mud-water separation, the water inlet distribution trough is used to evenly distribute the water, i.e., the flocculated wastewater, through reasonable water flow pattern calculation, and the flocculated wastewater is allowed to flow into the next system, i.e., the filtration system.

[0048] The filtration system includes a transmission device, which includes a driving wheel connected to a motor, a driven wheel, and a belt that cooperates with the driving wheel and the driven wheel for transmission. The rotation axes of the driving wheel and the driven wheel are parallel to the ground. Figure 1 The pulley in the belt can be a driving wheel or a driven wheel. The outlet slot of the water inlet distribution slot is located above the transmission device. The movement direction of the top edge of the driving wheel in the transmission device when it rotates is the transmission direction of the belt. When working, the transmission direction of the belt is opposite to the incoming water direction in the outlet slot of the water inlet distribution slot. The belt is provided with a first HIW filter cloth, which is a highly hydrophilic filter cloth. The hydrophilic material is used to enable the water molecules in the flocculated wastewater to pass through the filter cloth more quickly. The filter diameter of the filter cloth is less than 200 μm, which can well isolate the iron mud in the flocculated state from passing through the filter cloth. A driven mud pressing roller, i.e., a filter press wheel, is provided at the transmission end of the belt, so that when the iron mud accumulated on the first HIW filter cloth passes through the transmission end, the filter press wheel is used to filter the iron mud to further dehydrate it and reduce the volume of the iron mud. After the filter press, the iron mud enters the sludge discharge system through the skimmer plate adjacent to the transmission end.

[0049] The sludge discharge system includes a flocculation tank, which is located at the lower end of the skimmer plate. A shaftless screw conveyor is installed in the tank to transport the iron sludge after filtration. The iron sludge after filtration is transported to the sludge treatment system through the sludge collecting tank for further dehydration. The second HIW filter cloth is laid at the bottom of the flocculation tank, and the filtrate after filtration of the iron sludge flows into the water collecting tank below through the perforations at the bottom of the flocculation tank below the filter cloth. The second HIW filter cloth is a highly hydrophilic filter cloth made of hydrophilic material, and the filter diameter of the filter cloth is less than 200μm.

[0050] The flushing system comprises a high-pressure flushing pipe, which is located above the equipment. The first HIW filter cloth and / or the second HIW filter cloth can be flushed regularly or manually by passing compressed air or high-pressure water into the pipe.

[0051] The heavy filtration equipment for iron-containing sludge wastewater produced by Fenton reaction provided by the present invention has an iron sludge separation effect that is significantly higher than coagulation and sedimentation, thereby solving the pain point that the iron sludge floccules cannot be separated; the amount of PAM reagent used in the Fenton reaction is significantly reduced, saving the reagent cost; the fine requirements for alkali adjustment in the Fenton reaction are reduced, and alkali can be added in excess without considering the problem of PAM hydrolysis, thereby improving the convenience of on-site operation; the iron sludge after pressure filtration does not need to be concentrated and can directly enter the sludge treatment terminal, thereby saving the cost and land occupation of the sludge system; automatic operation can be achieved without human supervision; the effluent quality is guaranteed, and the treatment effect of the subsequent biochemical system is improved; gravity filtration is achieved to achieve the effect of mud-water separation; the investment cost is low, the operating cost is low, and the on-site operation management is simple and convenient.

[0052] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A re-filtration device for iron-containing sludge wastewater produced by Fenton reaction, characterized in that: include: Water distribution system, filtration system, in, The water distribution system is used to evenly distribute the incoming water, which is flocculated wastewater, and allows the flocculated wastewater to flow into the next system, namely the filtration system; The filtering system comprises a transmission device, which comprises a driving wheel connected to a motor, a driven wheel, and a belt that cooperates with the driving wheel and the driven wheel and is used for transmission. The rotating shafts of the driving wheel and the driven wheel are parallel to the ground. The water distribution system is located above the transmission device. The movement direction of the top edge of the driving wheel in the transmission device when rotating is the transmission direction of the belt. When working, the transmission direction of the belt is opposite to the water inflow direction of the water distribution system. A first HIW filter cloth is arranged on the belt, and the first HIW filter cloth is a highly hydrophilic filter cloth made of hydrophilic material.

2. The heavy filtration equipment for iron-containing sludge wastewater produced by Fenton reaction according to claim 1 is characterized in that: The water distribution system includes an inlet water distribution trough, and the inlet water distribution trough is used to evenly distribute the inlet water; The water outlet slot of the water inlet distribution slot is located above the transmission device. When working, the conveying direction of the belt is opposite to the incoming water direction in the water outlet slot of the water inlet distribution slot.

3. The heavy filtration equipment for iron-containing sludge wastewater produced by Fenton reaction according to claim 1 or 2, characterized in that: A driven mud pressing roller, i.e., a filter pressing wheel, is arranged at the conveying end of the belt, so that when the iron mud accumulated on the first HIW filter cloth passes through the conveying end, the iron mud is pressed and filtered by the filter pressing wheel to further dehydrate it and reduce the volume of the iron mud.

4. The heavy filtration equipment for iron-containing sludge wastewater produced by Fenton reaction according to claim 3 is characterized in that: It comprises a skimming plate adjacent to the transmission end and a sludge discharge system, and the iron sludge after filter pressing enters the sludge discharge system through the skimming plate.

5. The heavy filtration equipment for iron-containing sludge wastewater produced by Fenton reaction according to claim 4 is characterized in that: The sludge discharge system comprises a flocculation tank, and the flocculation tank is located at the lower end of the skimmer plate.

6. The heavy filtration equipment for iron-containing sludge wastewater produced by Fenton reaction according to claim 5 is characterized in that: A shaftless screw conveyor is installed in the sludge tank to convey the iron sludge after filter pressing. The iron sludge after filter pressing is conveyed to the sludge treatment system through the sludge collecting tank for further dehydration.

7. The heavy filtration equipment for iron-containing sludge wastewater produced by Fenton reaction according to claim 6 is characterized in that: The bottom of the sludge tank is paved with a second HIW filter cloth, which is a highly hydrophilic filter cloth made of hydrophilic material.

8. The heavy filtration equipment for iron-containing sludge wastewater produced by Fenton reaction according to claim 7 is characterized in that: The filter diameters of the first HIW filter cloth and the second HIW filter cloth are both less than 200 μm.

9. The heavy filtration equipment for iron-containing sludge wastewater produced by Fenton reaction according to claim 8, characterized in that: The bottom of the sludge tank below the second HIW filter cloth is provided with perforations; A water collecting tank is provided below the bottom of the sludge tank.

10. The heavy filtration equipment for iron-containing sludge wastewater produced by Fenton reaction according to claim 9, characterized in that: It also includes a flushing system, which includes a high-pressure flushing pipe. The high-pressure flushing pipe is located above the heavy filtration equipment. The first HIW filter cloth and / or the second HIW filter cloth are flushed regularly or manually by passing compressed air or high-pressure water into the high-pressure flushing pipe.

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