CN211226566U

CN211226566U - Electricity-zero-valent iron system for accelerating removal of sulfide in sewage pipeline

Info

Publication number: CN211226566U
Application number: CN201921973886.2U
Authority: CN
Inventors: 金天璐; 远野; 陈天明; 叶凡; 丁成
Original assignee: Yancheng Institute of Technology
Current assignee: Yancheng Institute of Technology
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-08-11
Anticipated expiration: 2029-11-15

Abstract

The utility model belongs to the technical field of sewage treatment, especially, get rid of electricity-zero valent iron system of sewer line sulphide with higher speed, including group battery, negative pole group, positive pole group, integrated circuit pipe, fixed chassis, connect gradually through the wire, negative pole group and positive pole group are in the anaerobic zone that is close to bottom mud department below the liquid level in municipal sewage pipeline, and positive pole group and negative pole group are installed in the bottom that is close to mud department through fixed chassis, and sulfate reducing bacteria in municipal sewage pipeline bed mud is with SO₄ ^2‑Reduction of sewage into S^2‑Then Fe generated by the anode electrode in the anode group²⁺Is oxidized into Fe₂S, Fe produced simultaneously₂S is quickly separated from the anode electrode through the action of hydraulic scouring, so that the generation of hydrogen sulfide is effectively inhibited. The utility model discloses simple structure, sulphur conversion is effectual, and is pollution-free to the environment, can effectively remove the sulphur composition that contains in the sewage, reduces the formation of hydrogen sulfide.

Description

Electricity-zero-valent iron system for accelerating removal of sulfide in sewage pipeline

Technical Field

The utility model belongs to the technical field of sewage treatment, especially, relate to an get rid of electric-zero-valent iron system of sewer line sulphide with higher speed.

Background

In recent years, environmental problems have increasingly attracted domestic and foreign attention, and more manpower and material resources are invested in the country in the aspect of environmental problems. And municipal sewage pipeline hydrogen sulfide (H) as one of environmental problems₂S) release problem has become a hot topic in the field of environmental research today. Corrosion of municipal sewage pipes, where H represents a huge economic loss to each country every year₂The corrosion caused by S is one of the most main causes of corrosion of sewage pipelines. In addition to this, H₂S is a toxic gas, and if diffused in the environment, the harm to human health is not insignificant. The urbanization process of China is accelerated continuously, and at present, the total length of municipal drainage networks of China reaches 51 kilometers, so that the method has strategic significance on how to control the generation of the municipal sewage pipeline hydrogen sulfide, and can bring huge economic benefits.

H₂S production requires a series of processes to generate SO carried in the sewage in the anaerobic zone below the municipal sewage pipeline₄ ^2-Is first reduced to S by the action of Sulfate Reducing Bacteria (SRB)²，S^2-Then with hydrogen ions (H) in water⁺) Binding to produce H₂And S escapes. Municipal sewage pipelines transport various kinds of sewage in daily life to sewage treatment plants, but H₂S generation is inevitable, and H₂S is difficult to collect, and therefore, H is suppressed in the waste water₂The generation of S has practical significance, and the generation of toxic gas is directly killed in the cradle. Thus, the conventional method involves introducing a disinfectant (e.g., sodium hypochlorite, etc.) into the sewer line,Molybdate), strong base, metal ion, etc., which can effectively inhibit the generation of Sulfate Reducing Bacteria (SRB), or can increase pH to allow S^2-Precipitate, so that hydrogen sulfide (H) can be effectively inhibited₂S), these conventional methods are effective, but the investment cost is high, so it is difficult to apply them on a large scale. In recent years, biochemical methods have been used to biochemically treat S in sewer pipes^2-Methods for conversion to other compound forms have become popular. By regulating the dosage of the electron acceptor, S^2-Can be converted into elemental sulfur (S) by denitrifying bacteria in the sewage pipeline⁰). S contained in municipal sewage pipes at sewage discharge outlets and bottom sludge²Very high in concentration, therefore H₂S is very much generated. NO₃ ^-When the electron acceptor flows with sewage in the sewage pipeline, the advantage is that the sewage pipeline S with a certain length can be used^2-Plays a very effective control role. At present, it is aimed at continuously generating S^2-A more convenient and faster inhibition method is lacking for a sewage pipe node with a higher concentration.

In recent years, zero-valent iron (ZVI) is a new substance for water pollution treatment, has bright application prospect in the aspects of toxic pollutant and heavy metal treatment and the like, and has low key input cost, simple and convenient operation and no secondary pollution. According to the existing research, the following results are proved: ZVI can be used in anaerobic conditions by binding H in water⁺Production of Fe²⁺And is of Fe²⁺Has strong reducibility, so that S in water can be mixed with^2-Combined to generate FeS, and effectively inhibits H by removing the FeS through the flow of sewage₂And (4) generating S. The zero-valent iron (ZVI) electrode can have the problem of electrode surface passivation, so that the problem of electrode surface passivation can be solved by adding an external voltage on the zero-valent iron (ZVI) electrode, and the accelerated removal of S in sewage can be achieved^2-Thereby more effectively suppressing the generation of hydrogen sulfide. This patent proposes a method for continuously converting S in sewage pipes by using ZVI filler as 'fixed' electron acceptor^2-The process idea is that an additional electrode is added on the surface of the zero-valent iron to accelerateExcept for hydrogen sulfide in municipal sewage pipes. For producing S in municipal sewage pipe network^2-And carrying out reinforced control on key points with higher concentration.

SUMMERY OF THE UTILITY MODEL

Produce the higher sewage well point of hydrogen sulfide concentration and carry out the problem of reinforceing control to municipal administration sewage pipe, the utility model aims to provide an electric-zero valent iron system of getting rid of sewage pipe sulphide with higher speed utilizes the ZVI net silk to do "fixed" electron acceptor and change S in the sewage pipe in succession^2-Process idea for producing S in municipal sewage pipe network^2-And performing reinforced control on key points with higher concentration.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides an it gets rid of electricity-zero valent iron system of sewer line sulphide with higher speed, includes from last to setting gradually group battery, integrated circuit pipe, the fixed chassis on the sewer well wall down, fixed chassis is located the sewer well bottom and is close to mud department, line connection between the positive pole joint of group battery and the integrated circuit pipe, be equipped with positive pole group and negative pole group on the fixed chassis, line connection between the negative pole joint of negative pole group and group battery, line connection between positive pole group and the integrated circuit pipe.

As a further preferable scheme, the fixing base plate is provided with a mosaic groove for installing the anode group and the cathode group.

In a further preferred embodiment, the anode set is a circular wire mesh structure, and the circular wire mesh structure is 600mm high.

As a further preferable scheme, the anode group comprises three circles of concentric circular wire mesh structures, and the cathode group is located in the circular wire mesh structure at the innermost circle.

As a further preferable scheme, three circuits are arranged on the integrated circuit tube and are respectively connected with three circles of circular wire mesh structures.

As a further preferable scheme, the cathode group is a cylindrical structure surrounded by carbon fiber nets.

The utility model discloses an it is effectual to get rid of electricity-zero valent iron system of sewer line sulphide with higher speed, moreover, the steam generator is simple in structure, sulphur conversion is effectual, pollution-free to the environment, can effectively get rid of the aquatic sulphur composition that contains, reduce the formation of hydrogen sulfide, fixed chassis has the groove of inlaying, be favorable to the swift change of positive pole group and negative pole group, positive pole group comprises 3 ring form wire netting, can generate ferrous under anaerobic condition, can fully react rather than when rivers pass through, improve sulphur conversion rate, get rid of the sewer line sulphide with higher speed.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural diagram of an anode stack;

FIG. 3 is a schematic structural view of a cathode assembly;

FIG. 4 is a comparison of removal rates with and without applied voltage;

FIG. 5 is a graph showing a comparison of removal rates at different flow rates when the applied voltage was 0.6V;

wherein, 1-fixed chassis, 2-anode group, 3-cathode group, 4-integrated circuit tube, and 5-battery group.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Example one

The utility model discloses in, group battery (5) are fixed on the bilge well wall, are located well lid below 60cm position department, and 30cm department wall mounting integrated circuit pipe (4) below the anodal of group battery (5), and group battery (5) anodal through wire connection integrated circuit pipe (4), and the wire reconnection that integrated circuit pipe (4) were drawn to positive pole group (2), and group battery (5) negative pole lug connection is to negative pole group (3), and above-mentioned wire is all fixed on the sewage wall of a well.

The anaerobism region is near bottom mud department below the municipal administration sewer line liquid level, fixed chassis (1) is in the anaerobism region through welding steel pipe welding, positive pole group (2) and negative pole group (3) are fixed in fixed chassis (1) through inlaying the groove, and positive pole group (2) and negative pole group (3) most region are in the coplanar with horizontally sewer line, the electrode bottom is connected by independent wire, it leads to fixed chassis (1) outside to derive the aperture through the wire, positive pole group (2) wire is finally made up in integrated circuit pipe (4), the reconnection is to group battery (5) anodal, negative pole group (3) wire lug connection is to the group battery negative pole. The anode group (2) and the cathode group (3) are embedded in the groove, so that the device is convenient to replace quickly. The electric-zero-valent iron system is arranged below the sewage and close to the sludge.

Example two

The anode group 2 is a circular wire netting structure, the anode group 2 comprises three circles of circular wire netting structures which are concentric and have different diameters, three circuits are arranged on the integrated circuit tube 4 and are respectively connected with the three circles of circular wire netting structures, and the cathode group 3 is positioned in the circular wire netting structure at the innermost circle; the cathode group 3 is a cylindrical structure surrounded by carbon fiber nets, and the cathode group 3 adopts a dense net structure, so that sewage can be in full contact reaction with the carbon rods conveniently;

the cathode group and the anode group are positioned in an anaerobic area close to bottom sludge below the liquid level in the municipal sewage pipeline, the anode group and the cathode group are installed at the bottom close to the sludge through a fixed chassis, the anode group is a wire netting made of ZVI, and the generation of Fe can be accelerated under the anaerobic condition by applying external voltage²⁺SO in municipal sewage pipes₄ ^2-The sewage is reduced into S by sulfate reducing bacteria in the municipal sewage pipeline bottom mud^2-Then Fe generated by an anode electrode in an anode group in an anaerobic zone at the bottom of the municipal sewage pipeline²⁺Is oxidized into Fe₂S, Fe produced simultaneously₂The S is rapidly separated from the anode electrode by the action of hydraulic flushing. In the operation process, the maintenance and overhaul of the anode group and the cathode group can be completed by a special clamping device. This patent is to export sewage in the system sampling in order to detect the change of sulphur conversion thing concentration.

EXAMPLE III

The sewage flow rate in the sewage is usually 0.6m/s, and the zero-valent iron (ZVI) usually has the problem of surface passivation, so an external voltage is added to the zero-valent iron electrode group, and in order to examine the sulfur conversion efficiency of the zero-valent iron system under different voltages, a group of control cases (a blank control group is a zero-valent iron system without the external voltage, and the other group is an electric-zero-valent iron system under different voltages) is made under the condition of 0.06 m/s.

Under the condition that the flow rate of sewage is 0.06m/s, the removal rate of the reactor after stable operation is shown in figure 4, under the condition of no external voltage, the removal of a zero-valent iron system pair is continuously reduced and gradually tends to be stable, under the condition of external voltage, the whole removal rate is firstly increased, the removal rate tends to be stable when about 91 percent, then certain voltage is increased, and the whole removal rate is in a reduction trend, but the whole removal rate is higher than the condition of no additional voltage. Therefore, an external voltage is added on the surface of the zero-valent iron, so that S can be removed in an accelerated way^2-And the sulfur conversion efficiency is highest at a voltage of 0.6V.

Example four

Under the condition that the applied voltage of the electric-zero-valent iron system is 0.6V, S in sewage is investigated by different sewage flow rates (0.06 m/S, 0.12m/S and 0.18 m/S)^2-The removal rate of the system, the operation stability and the operation effect of the system. A blank control group (the control group is the same as the other 3 groups except that no external voltage is applied) is also set. As shown in FIG. 5, the system has the highest removal rate when the flow rate of the sewage is 0.06m/S, and the blank control group has the lowest removal rate, so that the faster the flow rate of the sewage is, the S in the sewage is under the action of ZVI^2-The lower the removal rate, which is probably due to the influence of the sewage flow rate on the release of Fe due to zero-valent iron corrosion²⁺Velocity, thereby reducing the velocity of S in the wastewater^2-A precipitation rate is generated.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the inventive concept of the present invention within the technical scope of the present invention.

Claims

1. An electric-zero valent iron system for accelerating the removal of sulfide in a sewage pipeline is characterized in that: include from last to setting gradually group battery (5), integrated circuit pipe (4), fixed chassis (1) on the bilge well wall down, fixed chassis (1) are located below the liquid level and are close to bottom mud anaerobism region, weld on the wall of a well through the welding steel pipe on the chassis edge, line connection between the positive pole joint of group battery (5) and integrated circuit pipe (4), be equipped with positive pole group (2) and negative pole group (3) on fixed chassis (1), line connection between the negative pole joint of negative pole group (3) and group battery (5), line connection between positive pole group (2) and integrated circuit pipe (4).

2. The electro-zero valent iron system for accelerating the removal of sewer sulfide of claim 1, wherein: the fixed chassis (1) is provided with an embedded groove for installing the anode group (2) and the cathode group (3).

3. The electro-zero valent iron system for accelerating the removal of sewer sulfide of claim 2, wherein: the anode group (2) is of a circular wire mesh structure, and the height of the circular wire mesh structure is 600 mm.

4. The electro-zero valent iron system for accelerating the removal of sewer sulfide of claim 3, wherein: the anode group (2) comprises three circles of concentric circular wire netting structures, and the cathode group (3) is positioned in the center of the fixed chassis.

5. The electro-zero valent iron system for accelerating the removal of sewer sulfide of claim 4, wherein: and three circuits are arranged on the integrated circuit tube (4) and are respectively connected with three circles of circular wire netting structures.

6. The electro-zero valent iron system for accelerating the removal of sewer sulfide of claim 1, wherein: the cathode group (3) is of a cylindrical structure surrounded by carbon fiber nets.