CN210945255U - Zero-valent iron system for removing hydrogen sulfide in municipal sewage pipeline well in situ - Google Patents
Zero-valent iron system for removing hydrogen sulfide in municipal sewage pipeline well in situ Download PDFInfo
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- CN210945255U CN210945255U CN201921784324.3U CN201921784324U CN210945255U CN 210945255 U CN210945255 U CN 210945255U CN 201921784324 U CN201921784324 U CN 201921784324U CN 210945255 U CN210945255 U CN 210945255U
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Abstract
A zero-valent iron system for in-situ removal of hydrogen sulfide from municipal sewage piping wells. The system comprises a zero-valent iron-sulfur conversion system and a lifting system, wherein the upper end of the lifting system is fixed below a sewage well cover, the lower end of the lifting system is connected with the zero-valent iron-sulfur conversion system, the lifting system comprises a fixed hook, a pulley block, a steel cable, two triangular irons and a steel pipe fishbone wire winder, the fixed hook is vertically welded under the steel pipe fishbone wire winder, an upper hook pulley in the pulley block is hung on the fixed hook, the steel cable is led out from the fixed end of the upper hook pulley along the vertical direction and then sequentially wound on a common pulley, the upper hook pulley and a lower hook pulley and then fixed on the steel pipe fishbone wire winder, and the zero-valent iron conversion system is hung below the lower; the zero-valent iron conversion system is positioned below the sewage surface and close to the sludge. The utility model discloses a conversion of sulphur is realized to the zeroth order iron powder on the honeycomb forceful electric magnet monolithic of system simple structure in through zeroth order iron sulphur conversion system, and the conversion rate is high to no pollution to the environment.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, concretely relates to zero-valent iron system of municipal sewage conduit well hydrogen sulfide is got rid of to normal position.
Background
In recent years, municipal sewage pipelines have been operated with hydrogen sulfide (H)2S) release problem, has become a research hotspot in the field of environmental research. Municipal sewage pipeline corrosion incurs annual economic losses of up to billions of dollars, where H2Corrosion caused by S release has become one of the most major causes of sewer corrosion. And H2The toxicity of S is also a significant problem that cannot be ignored. With the acceleration of the urbanization process in China, the total length of municipal drainage networks in China reaches 51 kilometers at present, so that the municipal sewage pipeline H is researched2S control has important scientific significance and practical economic requirements.
In anaerobic zones at the bottom of municipal sewage pipes, SO4 2-First reduced to sulfide (S) by Sulfate Reducing Bacteria (SRB)2-），S2-Then with hydrogen ions (H) in water+) Binding to produce H2And S escapes. Municipal sewage pipes serve to transport sewage to sewage treatment plants and are intended to implement H2S collection is very difficult, and therefore, S is collected from the sewage2-Production and transformation of interest to address H2The problem of S release is very realistic. The traditional method is to add chemical agents such as bactericides (such as sodium hypochlorite and molybdate), strong alkali, metal ions and the like into the sewage pipeline, and inactivate, increase the pH and precipitate S through SRB2-Suppressing and eliminating S in equal way2-Its advantages are high effect, high cost and difficult application. In recent years, biochemical methods have been used to biochemically treat S in sewer pipes2-Methods for conversion to other compound forms have become popular. Nitrate Nitrogen (NO)3 -/NO2 -) And oxygenGas (O)2) Is to control the sewage conduit S2-Electron acceptors are commonly used. By regulating the dosage of the electron acceptor, S2-Can be converted into elemental sulfur (S) by denitrifying bacteria in the sewage pipeline0). The method has the advantages of large coverage area, but lacks of a point source conversion technology with strong applicability.
Zero-valent iron (ZVI) is a water pollution remediation technology emerging in recent years, and has bright application prospects in the aspects of toxic pollutant and heavy metal treatment and the like. The invention utilizes ZVI as an 'immobilized' electron acceptor which can be combined with H in water under anaerobic condition+Production of Fe2+，Fe2+Has strong reducibility, and can be mixed with S in waste water2-The components are subjected to redox reaction to generate FeS precipitate. Achieves the purpose of regulating and controlling S in the sewage2-Aims at solving the problem of point source nature S of the sewage pipeline2-The control opens the breach. And the ZVI has low cost, simple and convenient operation and no secondary pollution.
SUMMERY OF THE UTILITY MODEL
For the continuous production of S2-The higher sewage pipe node of concentration then lacks the problem of "point source" nature conversion technique that the suitability is strong, the utility model aims to provide a zero-valent iron system of municipal sewage pipe shaft hydrogen sulfide is got rid of to the normal position, the utility model discloses utilize ZVI to pack and do "fixed" electron acceptor and come the S in the sewage pipe of continuous conversion2-The process idea of producing S in municipal sewage pipe network2-The key point position with higher concentration is subjected to strengthening control, and the system has the advantages of simple structure, good sulfur conversion effect and no pollution to the environment.
A zero-valent iron system for removing hydrogen sulfide in a municipal sewage pipeline well in situ comprises a zero-valent iron conversion system and a lifting system, wherein the upper end of the lifting system is fixed below a sewage well cover, the lower end of the lifting system is connected with the zero-valent iron conversion system, the lifting system comprises a fixed hook, a pulley block, a steel cable, two triangular irons and a steel pipe fishbone wire winder, the two triangular irons are symmetrically riveted on two sides of a pipe wall, two ends of the steel pipe fishbone wire winder are respectively inserted into the triangular irons and fixed through rivets, the fixed hook is vertically welded under the steel pipe fishbone wire winder, the pulley block comprises an upper hook pulley, a common pulley, a lower hook pulley and the steel cable, the upper hook pulley is hung on the fixed hook, the steel cable is led out from the fixed end of the upper hook pulley along the vertical direction, and then is sequentially wound on the common pulley, the upper hook pulley and the lower hook pulley and then is, a zero-valent iron conversion system is suspended below the lower hook pulley; zero-valent iron conversion system is located sewage surface of water below and is close to mud department, including shell, honeycomb strong magnet group, zero-valent iron powder, the shell splices into the square box that lacks a side by five stainless steel plates that punch on the surface, through the fixed honeycomb strong magnet group of buckle in the square box, honeycomb strong magnet group comprises the vertical range of the strong electromagnetism monolithic of honeycomb that the surface evenly adheres to zero-valent iron powder.
The improved steel pipe fishbone wire rewinding device is characterized in that the steel pipe fishbone wire rewinding device is a stainless steel pipe, 6 groups of screws which are welded at the right side of the steel pipe at intervals of every 5cm and take the central point of the steel pipe as an initial point serve as fishbones, steel cables are convenient to fix, a groove is formed in the position, 10cm away from the tail end of the screw welding position, of the stainless steel pipe, the depth of the groove is 1/3 mm of the diameter of the stainless steel pipe, and the steel cables are convenient to unwind.
The honeycomb strong magnet group is formed by splicing honeycomb strong magnet sheets with the length of 600 mm, the width of 5mm and the thickness of 10 mm.
As an improvement, the buckle is made of two stainless steel plates with holes, and the holes are internally provided with elastic nuts.
As an improvement, the zero-valent iron and sulfur conversion system is vertical to the pipeline and is positioned below the surface of the sewage and close to the sewage.
The operation method of the zero-valent iron system for removing the hydrogen sulfide in the municipal sewage pipe well in situ comprises the following steps: installing sewage well cover, lifting system and zero-valent iron-sulfur conversion system, SO-containing in municipal sewage pipeline4 2-The sewage is reduced into S by sulfate reducing bacteria in the sludge at the bottom of the municipal sewage pipeline2-Then through a zero-valent iron-sulfur conversion system with Fe2+FeS sediment is generated by combination and is separated from the device through hydraulic flushing; adjusting zero-valent iron-sulfur conversion system by lifting deviceAnd the system is positioned so that the zero-valent iron-sulfur conversion system is positioned below the sewage surface and close to the sludge deposition position to complete the purification of the sewage.
Has the advantages that:
1. the honeycomb strong electromagnetic group of the utility model adopts an embedded structure, and is made by vertically and symmetrically fixing corrugated plates made of 12 strong magnets on the shell with buckles at the upper part and the lower part, which is beneficial to fixing the electromagnetic sheet and conveniently replacing zero-valent iron powder;
2. the honeycomb strong current magnetic sheet of the utility model adopts honeycomb shape and symmetrical embedding, so as to increase the contact area to make S2-The reaction with the zero-valent iron powder is sufficient, gaps are formed between every two honeycomb strong magnetic sheets, and sewage flows into the gaps to form convection, so that the reaction is more sufficient;
3. the utility model designs a stainless steel shell with holes on the surface, which can filter a part of larger solid in the sewage and protect the fragile honeycomb strong electromagnetic group from colliding;
4. the utility model discloses be in sewage surface of water below and be close to mud department and avoided zero-valent iron and air reaction by the oxidation, guaranteed that the device is in anaerobic environment, make the device can the steady operation.
Drawings
Fig. 1 is a schematic structural diagram of a system according to embodiment 1 of the present invention, wherein 1-a manhole cover, 2-angle iron, 3-a steel pipe fishbone take-up device, 4-a fixed hook, 5-a pulley block, 6-a zero-valent iron conversion system, 9-an upper hook pulley, 10-a common pulley, 11-a lower hook pulley, and 12-a steel cable;
fig. 2 is a three-dimensional view of a triangular iron in the system of the present invention, wherein (a) is a side view, (b) is a front view, and (c) is a top view;
fig. 3 is a three-dimensional view of a stainless steel housing in a system of the present invention, wherein (a) is the front of the housing, (b) is the side of the housing, and (c) is a top view of the housing;
FIG. 4 is a view of the internal honeycomb strong electromagnetic sheet of the zero-valent iron conversion system in the system of the present invention; (a) the water inlet surface view is shown, 7-buckle, 8-honeycomb strong electromagnetic single sheet, and 13-shell; (b) is a front view of a honeycomb strong electromagnetic single sheet;
FIG. 5 is a perspective view of a zero-valent iron conversion device;
FIG. 6 is the influence of zero-valent iron powder with different particle sizes on the sulfur conversion rate under the condition of sewage flow rate of 0.6 m/s;
FIG. 7 is the influence of zero-valent iron powder with different particle sizes on the sulfur conversion rate under the condition of sewage flow rate of 0.8 m/s;
FIG. 8 is a graph showing the influence of zero-valent iron powder with different particle sizes on the sulfur conversion rate under the condition of a sewage flow rate of 1.0 m/s;
fig. 9 is a structural view of the buckle, in which (a) is an overall view, (b) is a nut, and (c) is a buckle housing.
Detailed Description
Example 1
A zero-valent iron system for removing hydrogen sulfide of a municipal sewage pipeline well in situ comprises a zero-valent iron-sulfur conversion system 6 and a lifting system, wherein the upper end of the lifting system is fixed below a sewage well cover 1, the lower end of the lifting system is connected with the zero-valent iron-sulfur conversion system 6, the lifting system comprises a fixing hook 4, a pulley block 5, a steel cable, two triangular irons 2 and a steel pipe fishbone wire winder 3, the two triangular irons 2 are symmetrically riveted to two sides of a pipe wall, two ends of the steel pipe fishbone wire winder 3 are respectively inserted into the triangular irons 2 and fixed through rivets, and the steel cable is wound in a gap between the screws to complete the function of a fixing device; the fixed hook 4 is vertically welded under the steel pipe fishbone wire winder 3, the pulley block 5 comprises an upper hook pulley 9, a common pulley 10, a lower hook pulley 11 and a steel cable 12, the upper hook pulley 9 is hung on the fixed hook 4, the steel cable 12 is led out from the fixed end of the upper hook pulley 9 along the vertical direction, then the upper hook pulley 9 is sequentially wound on the common pulley 10, the upper hook pulley 9 and the lower hook pulley 11 and then fixed on the steel pipe fishbone wire winder 3, and the zero-valent iron-sulfur conversion system 6 is hung under the lower hook pulley 11; zero-valent iron sulphur conversion system 6 is located sewage surface of water below and is close to mud department, and includes shell 13, honeycomb strong magnet group and zero-valent iron powder, shell 13 splices into the square box that lacks a side by five stainless steel plates that punch on the surface, fixed honeycomb strong magnet group by honeycomb strong electromagnetism monolithic 8 of constituteing through buckle 7 in the shell 13, buckle 7 is located top surface and bottom surface in shell 13 respectively, and wherein, the buckle is shown as figure 9, comprises two stainless steel splint, and punches in the middle of and places the elasticity nut in the hole.
Zero-valent iron powder is uniformly attached to the surface of the honeycomb strong electromagnetic single sheet 8. The reaction is quicker by increasing the specific surface area, the honeycomb strong electromagnetic single sheets are vertically arranged and fixed between the top surface and the bottom surface in the shell and are parallel to the water flow direction, the contact area between the honeycomb strong electromagnetic single sheets and sewage is increased, the convection formed by the honeycomb space between the single sheets is favorable for the full reaction, and the reaction speed is greatly improved.
The shell that the stainless steel sheet that the surface punched was assembled has fixed effect as the bearing device of honeycomb strong magnet group, and the dead weight of stainless steel itself has also guaranteed the stability of this device position under the torrent, and the shell punches to be favorable to rivers on the one hand and also play the effect prevention device of filtering solid rubbish in the sewage on the one hand and be blocked, and the adoption of buckle has made things convenient for the dismouting of honeycomb strong electromagnetism monolithic 8, the very big maintenance and the maintenance that have made things convenient for the device.
As can be seen from fig. 1, the upper hook pulley of the device is hung on the fixed hook 4, and is sequentially wound on the upper hook pulley, the common pulley and the lower hook pulley along a vertical direction by a steel cable and then fixed on the steel pipe fishbone wire-rewinding device 3, and the lower hook pulley is hung below the zero-valent iron conversion system 6; the lifting of the zero-valent iron-sulfur conversion system 6 can be flexibly realized by loosening the steel cable, the purpose of adjusting the position is achieved, and the change of the position of the zero-valent iron-sulfur conversion system is realized. The zero-valent iron-sulfur conversion system is arranged below the sewage surface and close to the sludge. When the zero-valent iron and sulfur conversion system 6 is close to the sewage well cover 1, the lifting device and the zero-valent iron and sulfur conversion system can be taken out together by moving the sewage well cover 1, so that the maintenance and overhaul of the zero-valent iron and sulfur conversion system are facilitated.
Example 2
Above-mentioned zero-valent iron of municipal sewage piping shaft hydrogen sulfide is got rid of to normal positionThe operation method of the system comprises the following steps: installing sewage well cover, zero-valent iron-sulfur conversion system and lifting system, and SO in municipal sewage pipeline4 2-The sewage is reduced into S by sulfate reducing bacteria in the sludge at the bottom of the municipal sewage pipeline2-Then through a zero-valent iron-sulfur conversion system with Fe2+FeS sediment is generated by combination and is separated from the device through hydraulic flushing; the position of the zero-valent iron-sulfur conversion system is adjusted through the lifting device, the purification of sewage is completed, and the zero-valent iron-sulfur conversion system is maintained and overhauled through the lifting device in the operation process. The invention samples the outlet sewage in the system to monitor the concentration change of the sulfur conversion product and samples the gas above the sewage well cover 1 to determine H2The concentration of S.
Example 3
In general, the price of zero-valent iron powder is increased rapidly along with the reduction of the particle size, and in order to investigate the value of the particle size of the iron powder, the zero-valent iron system has the best effect on sulfur conversion of a sewage pipeline. A group of comparison tests are carried out under the condition that the sewage flow rate is 0.6m/s (namely 100g of zero-valent iron powder with the grain diameter of 0.15mm, 0.25mm and 2mm is respectively attached to the honeycomb strong electromagnetic single sheets 8, and a blank comparison group is arranged, wherein the device conditions and the parameter conditions of the comparison group are not changed except that the honeycomb strong electromagnetic single sheets 8 are not attached with the iron powder). The apparatus operating method in the test was as in example 2.
The flow rate of sewage is 0.6 m.s-1Under the condition, the reactor enters a stable operation state and then goes out of water S2-As can be seen from FIG. 6, when the diameters of the zero-valent iron powder attached to the strong electromagnetic honeycomb monoliths 8 in the zero-valent iron-sulfur conversion system are 0.15mm, 0.25mm and 2mm, S in the sulfur conversion product2-The concentration of S in the outlet sewage respectively reaches 8.12mg/L, 14.31mg/L and 20.29mg/L, and the S concentration in the blank control group2-The concentration of 39.29mg/L is 32 times the diameter of the zero-valent iron of 0.15 mm.
Therefore, the arrangement that the zero-valent iron powder with the particle size of 0.15mm is attached to the honeycomb strong electromagnetic single sheet 8 of the system is more beneficial to sulfur conversion of the sewage pipeline compared with other particle sizes. The reduction of the grain size of the zero-valent iron powder increases the specific surface area of the iron powder, can provide more reduction sites and accelerates the reaction rate.
Under the condition that 100g of zero-valent iron powder with the grain diameter of 0.15mm, 0.25mm and 2mm is respectively attached to the honeycomb strong electromagnetic single sheet 8 in the zero-valent iron conversion system, the flow rate of sewage is 0.8m/s to investigate the sewage SO4 2-The operation stability and the operation effect of the system under the concentration fluctuation. Meanwhile, a blank control group is set (the control group has no change in the device conditions and parameter conditions except that the strong electromagnetic sheet is not attached with iron powder).
As can be seen from FIG. 7, when the flow rate of sewage is 0.8m/S and the particle sizes of iron powder attached to the strong electromagnetic sheet in the sulfur conversion system are 0.15mm, 0.25mm and 2mm, S in the sulfur conversion product is present in the system2-The concentration of S in the outlet sewage respectively reaches 7.56mg/L, 13.61mg/L and 22.29mg/L, and the S concentration in the blank control group2-The concentration reaches 35.4mg/L, S2-The concentration of (A) is from high to low: control group>2 mm>0.25 mm>0.15mm, as the smaller the ZVI particle size, S2-The better the control effect. Therefore, the sulfur conversion effect of the 0.15mm zero-valent iron powder is the best under the condition that the sewage flow rate is about 0.8 m/s.
Under the condition that 100g of zero-valent iron powder with the grain diameters of 0.15mm, 0.25mm and 2mm are respectively attached to a strong electromagnetic sheet in a zero-valent iron conversion system, the flow speed of sewage is 1m/s to investigate the sewage SO4 2-The operation stability and the operation effect of the system under the concentration fluctuation. Meanwhile, a blank control group is set (the control group has no change in the device conditions and parameter conditions except that the strong electromagnetic sheet is not attached with iron powder).
From FIG. 8, it is apparent that S is 0.25mm in particle size as compared with 2mm in particle size2-The concentration is reduced by 30.8 percent, and the grain diameter of 0.15mm is reduced by 42.12 percent compared with the grain diameter of 0.25 mm. It can be seen from this that: under the condition of the same flow rate, the smaller the particle size of the zero-valent iron powder is, the higher the conversion rate of sulfur is, and the better the running effect of the device is. However, considering that the sewage flow rate in municipal sewage pipelines is usually not high, the conversion rate can reach more than 70% by using iron powder with the particle size of 0.25mm, and the unit price per ton of the iron powder is only 1/2 of 0.15mm zero-valent iron powder, so the iron powder with the particle size of 0.25mm is a choice with lower economic cost and better sulfur conversion effect.
From FIG. 6-8 in the sewer line S, not implanted in the zero-valent iron conversion system2-The concentration has no obvious change, so that the zero-valent iron system for removing the hydrogen sulfide in the municipal sewage pipe well in situ has obvious effect, and the sulfur conversion effect is stable under the fluctuation of different sewage concentrations.
Claims (5)
1. The zero-valent iron system for removing hydrogen sulfide in a municipal sewage pipeline well in situ is characterized by comprising a zero-valent iron-sulfur conversion system (6) and a lifting system, wherein the upper end of the lifting system is fixed below a sewage well cover (1), the lower end of the lifting system is connected with the zero-valent iron-sulfur conversion system (6), the lifting system comprises a fixed hook (4), a pulley block (5), a steel cable, two triangular irons (2) and a steel pipe fishbone wire winder (3), the two triangular irons (2) are symmetrically riveted to two sides of a pipe wall, two ends of the steel pipe fishbone wire winder (3) are respectively inserted into the triangular irons (2) and fixed through rivets, the fixed hook (4) is vertically welded under the steel pipe fishbone wire winder (3), the pulley block (5) comprises an upper hook pulley (9), a common pulley (10), a lower hook pulley (11) and a steel cable (12), the upper hook pulley (9) is hung on the fixed hook (4), after being led out from the fixed end of the upper hook pulley (9) along the vertical direction, a steel cable (12) is sequentially wound on a common pulley (10), the upper hook pulley (9) and a lower hook pulley (11) and then is fixed on the steel pipe fishbone wire winder (3), and a zero-valent iron-sulfur conversion system (6) is suspended below the lower hook pulley (11); zero-valent iron sulfur conversion system (6) are located sewage surface of water below and are close to mud department, including shell (13), honeycomb strong magnet group, zero-valent iron powder, shell (13) splice into the square box that lacks a side by five stainless steel plates that punch on the surface, through buckle (7) fixed honeycomb strong magnet group in the square box, honeycomb strong magnet group is become by the honeycomb strong electromagnetism monolithic (8) vertical arrangement that the surface evenly adheres to zero-valent iron powder.
2. The zero-valent iron system for in-situ removal of hydrogen sulfide in municipal sewage wells according to claim 1, wherein the steel tube fishbone line winder (3) is mainly made of stainless steel tubes, 6 groups of screws are welded at intervals of every 5cm on the right sides of the steel tubes from the center points of the steel tubes as fishbones to fix the steel cables, and grooves are formed in the positions, 10cm on the right sides of the ends of the welded positions of the screws, of the stainless steel tubes, wherein the depth of each groove is 1/3 of the diameter of the stainless steel tube, so that the steel cables can be wound and unwound conveniently.
3. The zero-valent iron system for in-situ removal of hydrogen sulfide in municipal sewer wells according to claim 1, wherein the honeycomb strong magnet assembly is spliced by honeycomb strong magnets 600 mm long by 5mm wide by 10mm thick.
4. The zero-valent iron system for in-situ removal of municipal sewer well hydrogen sulfide according to claim 1, wherein the clasp (7) is made of two stainless steel plates with holes in which the turnbuckles are disposed.
5. The zero-valent iron system for the in situ removal of municipal sewer well hydrogen sulfide of claim 1, wherein the zero-valent iron system is perpendicular to the pipe.
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| CN110697982A (en) * | 2019-10-23 | 2020-01-17 | 盐城工学院 | Zero-valent iron system for in-situ removal of hydrogen sulfide in municipal sewage pipeline well and operation method thereof |
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| CN110697982A (en) * | 2019-10-23 | 2020-01-17 | 盐城工学院 | Zero-valent iron system for in-situ removal of hydrogen sulfide in municipal sewage pipeline well and operation method thereof |
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Address after: No.1, Middle Road, hope Avenue, Yancheng City, Jiangsu Province Patentee after: YANCHENG INSTITUTE OF TECHNOLOGY Address before: 224599 building, 1166 Century Avenue, Jiangsu, Yancheng City Patentee before: YANCHENG INSTITUTE OF TECHNOLOGY |