Sulfur autotrophic denitrification biological rotating cage

Abstract

The utility model discloses a sulfur autotrophic denitrification biological rotating cage which comprises a contact reaction tank, a biological rotating cage and a sulfur source feeding device, the contact reaction tank comprises a first-stage contact reaction tank and a second-stage contact reaction tank which are connected with each other, the biological rotating cage comprises a first-stage biological rotating cage and a second-stage biological rotating cage which are respectively mounted in the first-stage contact reaction tank and the second-stage contact reaction tank, and each of the first-stage biological rotating cage and the second-stage biological rotating cage comprises a rotating shaft and a framework fixedly connected to the rotating shaft; screens are arranged on the cross sections and the axis sections of the first-stage biological rotating cage and the second-stage biological rotating cage, the screens are fixed to the rotating shaft through a framework, and suspended biological filler is arranged in the first-stage biological rotating cage and the second-stage biological rotating cage. The utility model has the advantages of small head loss, no blockage, no hydraulic dead zone and no need of backwashing.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewage treatment technical field especially relates to a sulfur autotrophic denitrification biological transfer cage. BACKGROUND

[0002] Sewage treatment is an important issue in the current environmental field. The total nitrogen exceeding standard emission after secondary biochemical treatment of sewage has become a difficult problem to be solved, because it can easily cause water eutrophication and destroy the stability of the water ecological system. The total nitrogen in sewage is mainly nitrate nitrogen, so the removal of nitrate nitrogen has become one of the core points of sewage treatment.

[0003] The traditional denitrification method is heterotrophic denitrification filter, and its principle is to use heterotrophic denitrifying bacteria to utilize organic matter as electron donor under anoxic conditions to promote the reduction of nitrate nitrogen in sewage to nitrogen gas escaping. However, it is found in research that the organic carbon source is scarce after secondary biochemical treatment of sewage, which leads to the heterotrophic denitrification filter having to add organic carbon source in actual operation, thereby causing a series of drawbacks. From the economic cost point of view, the cost of reagents and energy consumption increases significantly, which brings heavy economic burden to sewage treatment plants; from the environmental impact and subsequent treatment point of view, the amount of residual sludge increases significantly, and the cost of sludge treatment and disposal also rises, and the amount of carbon source addition is difficult to control accurately, and once the addition is excessive, secondary pollution is easily caused, which causes potential harm to the surrounding water and soil environment.

[0004] Under this background, sulfur autotrophic denitrification technology emerges as the times require and becomes a new denitrification method in the field of sewage treatment, that is, using sulfur autotrophic denitrifying bacteria to reduce nitrate nitrogen in sewage to nitrogen gas under anoxic conditions with sulfur or sulfur compounds as electron donor, which has the advantages of less residual sludge, no need to add organic matter, reduction of operation cost and risk of secondary pollution, and has become one of the hot directions of current research and application of sewage treatment technology. At present, the most widely used technology of sulfur autotrophic denitrification is sulfur autotrophic denitrification filter, but there are still many technical bottlenecks, such as high price of sulfur-containing filter material used in sulfur autotrophic denitrification filter, which greatly increases the construction and operation cost of treatment facilities; in the filtration process, the water head loss is large, which affects the treatment efficiency and stability; the filter material is easy to block, which causes poor water flow and reduces the treatment effect; at the same time, hydraulic dead zones are also produced, which causes local sewage to be unable to be effectively treated; and regular backwashing maintenance is needed, which further increases the complexity of operation and management and cost investment, and these defects seriously limit the large-scale promotion and application of sulfur autotrophic denitrification filter. CONTENT OF THE UTILITY MODEL

[0005] In view of the deficiencies of the prior art, the utility model provides a sulfur autotrophic denitrification biological transfer cage, which aims to overcome the defects of the prior art, and the utility model has small water head loss, no blockage, no hydraulic dead zone and no need for backwashing.

[0006] In order to achieve the above object, the utility model adopts the following technical scheme:

[0007] A kind of sulfur autotrophic denitrification biological rotating cage, comprising: contact reaction tank, biological rotating cage and sulfur source adding device;Wherein the biological rotating cage is installed in the contact reaction tank, and the sulfur source adding device is installed at the front end of contact reaction tank;

[0008] The contact reaction tank includes a first-stage contact reaction tank and a second-stage contact reaction tank connected to each other, and the biological rotating cage includes a first-stage biological rotating cage and a second-stage biological rotating cage installed in the first-stage contact reaction tank and the second-stage contact reaction tank, respectively. The first-stage biological rotating cage and the second-stage biological rotating cage each include a rotating shaft and a framework fixedly connected to the rotating shaft. The first-stage biological rotating cage and the second-stage biological rotating cage are each provided with a screen on the cross section and the axial section. The screen is fixed to the rotating shaft by the framework, and the interior of the first-stage biological rotating cage and the second-stage biological rotating cage is provided with suspended biological filler.

[0009] As a further technical solution, the first-stage contact reaction tank and the second-stage contact reaction tank are each a U-shaped water tank. The water inlet end of the first-stage contact reaction tank is provided with a water inlet pipe, and the water outlet end of the second-stage contact reaction tank is sequentially provided with an overflow weir, an overflow tank, and a water outlet pipe.

[0010] As a further technical solution, the first-stage biological rotating cage and the second-stage biological rotating cage are each cylindrical in shape. The first-stage biological rotating cage and the second-stage biological rotating cage are each provided with two screens on the cross section, which divide the interior space of the first-stage biological rotating cage and the second-stage biological rotating cage into three parts.

[0011] As a further technical solution, the first-stage biological rotating cage and the second-stage biological rotating cage are each provided with one screen on the axial section, which divides the interior space of the first-stage biological rotating cage and the second-stage biological rotating cage into two parts.

[0012] As a further technical solution, the two ends of the rotating shaft in the first-stage biological rotating cage and the second-stage biological rotating cage are each provided with a bearing for support. The bearing is fixedly connected to the contact reaction tank, and the bearing is a waterproof shaft.

[0013] As a further technical solution, the rotating shaft at the end of the second-stage biological rotating cage away from the first-stage biological rotating cage is connected to a driving motor through the bearing.

[0014] As a further technical solution, a coupling is arranged between the rotating shafts of the first-stage biological rotating cage and the second-stage biological rotating cage, and the rotating shafts are connected by the coupling.

[0015] As a further technical scheme, the first contact reaction tank and the second contact reaction tank are connected through a connecting pipe.

[0016] As a further technical scheme, the sulfur source feeding device comprises a first sulfur source feeding device and a second sulfur source feeding device, and the first sulfur source feeding device and the second sulfur source feeding device are respectively installed at the front ends of the first contact reaction tank and the second contact reaction tank.

[0017] As a further technical scheme, the suspended biological filler is a hydrophilic polyurethane sponge filler.

[0018] The one or more technical schemes of the utility model have the following beneficial effects:

[0019] (1) The utility model discloses a biological rotating cage, which realizes no blockage and low water head loss, and the unique biological rotating cage structure design is a key factor. The biological rotating cage comprises a rotating shaft and a framework fixedly connected to the rotating shaft. The cross section and the axial section of the biological rotating cage are provided with a screen mesh. The suspended biological filler in the biological rotating cage serves as an adsorption carrier of elemental sulfur powder or sulfur compound powder and a growth carrier of sulfur autotrophic denitrifying bacteria. During rotation, the suspended biological filler makes the sewage fully contact with the filler and the sulfur source, thereby avoiding the aggregation and blockage of the sulfur source and the microorganisms. Compared with the traditional filter tank, the utility model has stable operation, does not need to frequently deal with the water head problem caused by blockage, and guarantees the continuous and efficient sewage treatment.

[0020] (2) In the utility model, the biological rotating cage is installed in the contact reaction tank, and the gap between the outer edge of the biological rotating cage and the bottom of the contact reaction tank is uniform, which ensures the uniform flow of the sewage in the reaction tank and avoids the existence of the hydraulic dead zone. This makes the nitrate nitrogen in the sewage fully participate in the reaction, improves the treatment efficiency and the stability of the treatment effect, avoids the problem of local treatment failure caused by the hydraulic dead zone, and improves the reliability of the overall treatment.

[0021] (3) In the utility model, the sulfur source feeding device is used to feed the elemental sulfur powder or the sulfur compound powder into the contact reaction tank. Compared with the traditional sulfur autotrophic denitrification filter tank, the sulfur source cost can be saved by more than 50%. In large-scale sewage treatment applications, this can greatly reduce the long-term operation cost and reduce the economic burden. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings accompanying the specification of the utility model form a part of the utility model and serve to provide further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions serve to explain the utility model, and do not constitute an improper limitation on the utility model.

[0023] Figure 1 Fig. 1 is a longitudinal section view of the sulfur autotrophic denitrification biological rotating cage.

[0024] Figure 2 It is a transverse section schematic view of the self-sustaining denitrification biological rotating cage of the utility model;

[0025] Among them, 1-contact reaction tank; 2-biological rotating cage; 3-sulfur source adding device; 101-water inlet pipe; 102-connection pipe; 103-overflow weir; 104-overflow tank; 105-water outlet pipe; 201-sieve; 202-frame; 203 rotating shaft; 204 waterproof bearing; 205 coupling; 206 driving motor; 207 suspended biological filler. DETAILED DESCRIPTION

[0026] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the utility model. Unless otherwise specified, all technical and scientific terms used in the utility model have the same meaning as generally understood by those skilled in the art to which the utility model belongs.

[0027] Example one

[0028] The utility model provides a kind of self-sustaining denitrification biological rotating cage, as shown in Figure 1 Sulfur autotrophic denitrification biological rotating cage includes: contact reaction tank 1, biological rotating cage 2 and sulfur source adding device 3, wherein, biological rotating cage 2 is installed in contact reaction tank 1 inside, immerse in sewage, the gap between the outer edge of biological rotating cage and the bottom of contact reaction tank is even, ensure that sewage flows evenly in reaction tank, there is no hydraulic dead zone.This makes that nitrate nitrogen in sewage can participate in reaction comprehensively, improves the stability of treatment efficiency and effect, avoids the problem of local treatment substandard caused by hydraulic dead zone, improves the reliability of overall processing, sulfur source adding device 3 is installed in the front end of contact reaction tank 1, specifically: in the embodiment, as shown in Figure 1 Contact reaction tank 1 includes primary contact reaction tank and secondary contact reaction tank connected with each other, and the primary contact reaction tank and the secondary contact reaction tank are connected by the connection pipe 102.Biological rotating cage 2 includes primary biological rotating cage and secondary biological rotating cage installed in the primary contact reaction tank and the secondary contact reaction tank respectively, specifically as shown in Figure 2As shown, the overall shape of the primary and secondary biological rotating cages is cylindrical, and the primary and secondary biological rotating cages each include a rotating shaft 203 and a framework 202 fixedly connected to the rotating shaft. The primary and secondary biological rotating cages each have a cross section and an axial section provided with a screen 201 fixed to the rotating shaft 203 by the framework 202. Specifically, the primary and secondary biological rotating cages each have two screens arranged to divide the internal space of the primary and secondary biological rotating cages into three parts, respectively. The primary and secondary biological rotating cages each have one screen arranged to divide the internal space of the primary and secondary biological rotating cages into two parts, respectively. In this embodiment, the primary and secondary biological rotating cages are internally provided with suspended biological fillers 207, which are hydrophilic polyurethane sponge fillers, and the filling ratio of the suspended biological fillers 207 in the biological rotating cage 2 is 65%. The sulfur source feeding device 3 includes a primary sulfur source feeding device and a secondary sulfur source feeding device, and both are automatic powder feeding devices. The primary and secondary sulfur source feeding devices are respectively installed at the front end of the primary and secondary contact reaction tanks, and are used to feed elemental sulfur powder or sulfur compound powder into the contact reaction tanks. Since the elemental sulfur powder or sulfur compound powder has a large specific gravity, the elemental sulfur powder or sulfur compound powder fed into the contact reaction tank can quickly settle at the bottom of the contact reaction tank and will not be lost with the effluent.

[0029] In this embodiment, as shown in Figure 2 The primary and secondary contact reaction tanks are U-shaped water tanks, as shown in Figure 1 Specifically, the water inlet end of the primary contact reaction tank is provided with a water inlet pipe 101, and the water outlet end of the secondary contact reaction tank is sequentially provided with an overflow weir 103, an overflow tank 104, and a water outlet pipe 105. Specifically, the overflow weir 103 is arranged at the water outlet end of the secondary contact reaction tank, and functions to overflow excess wastewater when the wastewater in the secondary contact reaction tank reaches a certain liquid level. The overflow tank 104 is located below the overflow weir 103 and is used to collect the wastewater overflowing from the overflow weir 103. The water outlet pipe 105 is connected to the overflow tank 104 and leads the wastewater collected in the overflow tank 104 out, thereby achieving the discharge of wastewater.

[0030] In this embodiment, as shown in Figure 1As shown, the two ends of the rotating shaft in the primary biological rotating cage and the secondary biological rotating cage are provided with bearings for supporting, and the bearings are fixedly connected to the contact reaction tank, wherein the bearings are waterproof bearings 204, and the rotating shaft of the secondary biological rotating cage away from the primary biological rotating cage is connected with a driving motor 206 through the bearing, the driving motor 206 drives the primary biological rotating cage and the secondary biological rotating cage to rotate through the rotating shaft, in the embodiment, the linear speed of the outer edge of the primary biological rotating cage and the secondary biological rotating cage is 7.85 m / min when rotating, and a shaft coupling 205 is arranged between the rotating shafts of the primary biological rotating cage and the secondary biological rotating cage and connected through the shaft coupling 205.

[0031] In the embodiment, as shown in the figure, Figure 1 The sulfur autotrophic denitrification biological rotating cage is divided into two stages, in other embodiments, it can also be one stage or multiple stages, according to the mass concentration of nitrogen in the sewage and the discharge requirements, the number of stages of the biological rotating cage and the contact reaction tank, the proportion of the suspended biological filler, and the adjustment of the dosage of the sulfur source, the adaptability to water quality is strong, the treatment effect is good and stable, the structure is the same as the embodiment, and it comprises a contact reaction tank 1, a biological rotating cage 2, and a sulfur source adding device 3.

[0032] The specific principle of the sulfur autotrophic denitrification biological rotating cage mentioned in the embodiment is as follows:

[0033] The elemental sulfur powder or sulfide powder is respectively added into the primary contact reaction tank and the secondary contact reaction tank through the primary sulfur source adding device and the secondary sulfur source adding device, due to the large specific gravity of the elemental sulfur powder or sulfide powder, the elemental sulfur powder or sulfide powder added into the contact reaction tank can quickly settle at the bottom of the contact reaction tank and will not be lost with the effluent, the driving motor drives the primary biological rotating cage and the secondary biological rotating cage to rotate through the rotating shaft, the suspended biological filler 207 in the primary biological rotating cage and the secondary biological rotating cage moves and continuously contacts with the sewage, and at the same time, contacts and adsorbs the elemental sulfur powder or sulfide powder deposited at the bottom of the contact reaction tank, the sulfur autotrophic denitrification bacteria fixedly grown on the suspended biological filler 207 takes the elemental sulfur or sulfide compound as the electron donor to reduce the nitrate nitrogen in the sewage into nitrogen, and the sewage is purified.

[0034] In actual operation, the added sulfur source is mixed powder, wherein the mass fraction of the elemental sulfur powder is 50 parts, the mass fraction of the sulfide powder (pyrite powder) is 35 parts, and the mass fraction of the limestone powder is 15 parts. The daily theoretical dosage of the sulfur source mixed powder is calculated according to formulas (1) and (2):

[0035] 55S + 20CO2 + 50NO3- + 38H2O + 4NH4+ → 4C5H7O2N + 25N2 + 55SO42- + 64H+ (1)

[0036] 5FeS2+ 15NO3-+ 10H2O → 10SO42-+ 7.5N2+ 5H++ 5Fe(OH)3(2)

[0037] Sulfur source mixed powder daily dosage according to the daily theoretical dosage of 1.25 times control, the first contact reaction tank in sulfur source mixed powder dosage according to the daily dosage of 2 / 3 control, two-stage contact reaction tank sulfur source mixed powder dosage according to the daily dosage of 1 / 3 control. Two-stage contact reaction tank and two-stage biological turn cage total nitrogen total removal rate is more than 96%.

[0038] The above only for the preferred embodiments of the present application and is not intended to limit the present application, for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application, should be included in the scope of protection of the present application.

Claims

1. A sulfur-autotrophic denitrification biological rotating cage, characterized in that, include: The contact reaction tank, the biological rotating cage, and the sulfur source dosing device are provided; wherein the biological rotating cage is installed inside the contact reaction tank, and the sulfur source dosing device is installed at the front end of the contact reaction tank. The contact reaction tank includes a primary contact reaction tank and a secondary contact reaction tank connected to each other. The biological rotating cage includes a primary biological rotating cage and a secondary biological rotating cage respectively installed inside the primary contact reaction tank and the secondary contact reaction tank. Both the primary biological rotating cage and the secondary biological rotating cage include a rotating shaft and a frame fixedly connected to the rotating shaft. The cross-section and axial section of both the primary biological rotating cage and the secondary biological rotating cage are provided with screens. The screens are fixed to the rotating shaft by the frame. Suspended biological packing is provided inside the primary biological rotating cage and the secondary biological rotating cage.

2. The sulfur autotrophic denitrification biological rotating cage as described in claim 1, characterized in that, Both the primary and secondary contact reaction tanks are U-shaped water tanks. The primary contact reaction tank is equipped with an inlet pipe at its inlet end, and the secondary contact reaction tank is equipped with an overflow weir, an overflow trough, and an outlet pipe at its outlet end.

3. The sulfur autotrophic denitrification biological rotating cage as described in claim 1, characterized in that, Both the primary and secondary biological rotating cages are cylindrical in shape, and each of the primary and secondary biological rotating cages has two screens in its cross-section, which divide the internal space of the primary and secondary biological rotating cages into three regions respectively.

4. The sulfur autotrophic denitrification biological rotating cage as described in claim 3, characterized in that, A screen is provided on the axial cross-section of the primary and secondary biological rotating cages to divide the internal space of the primary and secondary biological rotating cages into two regions, respectively.

5. The sulfur autotrophic denitrification biological rotating cage as described in claim 1, characterized in that, Both ends of the rotating shaft in the primary and secondary biological rotating cages are equipped with bearings for support, and the bearings are fixedly connected to the contact reaction tank. The bearings are waterproof bearings.

6. The sulfur autotrophic denitrification biological rotating cage as described in claim 5, characterized in that, The shaft of the secondary biological rotating cage, located away from the primary biological rotating cage, is connected to a drive motor via a bearing.

7. The sulfur autotrophic denitrification biological rotating cage as described in claim 1, characterized in that, A coupling is provided between the rotating shafts of the primary biological rotating cage and the secondary biological rotating cage, and they are connected through the coupling.

8. The sulfur autotrophic denitrification biological rotating cage as described in claim 1, characterized in that, The primary contact reaction tank and the secondary contact reaction tank are connected by a connecting pipe.

9. The sulfur autotrophic denitrification biological rotating cage as described in claim 1, characterized in that, The sulfur source dosing device includes a primary sulfur source dosing device and a secondary sulfur source dosing device, which are respectively installed at the front end of the primary contact reaction tank and the secondary contact reaction tank.

10. The sulfur autotrophic denitrification biological rotating cage as described in claim 1, characterized in that, The suspended biological packing material is a hydrophilic polyurethane sponge packing material.

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