Determination of total phosphorus in municipal wastewater treated by chemical phosphorus removal agent by ICP

Abstract

The application discloses an ICP determination method for total phosphorus after chemical phosphorus removal agent is used to treat municipal wastewater, and comprises the following steps: during molybdenum-antimony anti-photometric analysis, when the mixed agent in a Kjeldahl flask is heated by using a microwave heating device, the following step 2-1 is performed: step 2-1: power is supplied to a magnetron connected with a copper wire by using a power supply of the microwave heating device, so that microwave radiation heating is performed on the Kjeldahl flask; and the defect that the mixed agent is ejected and the surrounding environment is polluted and eroded due to loose clamping of the Kjeldahl flask when clamping is performed on the Kjeldahl flask after the mixed agent in the Kjeldahl flask is heated by using the microwave heating device during determination of phosphorus elements in municipal wastewater treated by using the chemical phosphorus removal agent by using the ICP determination method in the prior art is effectively avoided.

Description

Technical Field

[0001] This invention relates to the field of ICP determination technology, specifically to an ICP determination method for total phosphorus in urban wastewater after treatment with chemical phosphorus removal agents. Background Technology

[0002] Urban sewage refers to domestic sewage, industrial wastewater, and runoff sewage within urban areas. It is generally collected by urban pipe networks and treated at urban sewage treatment plants before being discharged into water bodies. In addition to containing large amounts of organic matter, bacteria, and viruses, urban sewage contains various types and levels of toxic and harmful pollutants due to the rapid development of industry, the increasing volume and quality of industrial wastewater (accounting for approximately 60-80% of total urban sewage), and the increasingly severe pollution of runoff sewage.

[0003] Therefore, urban sewage must undergo urban sewage treatment. Chemical phosphorus removal agents are used to treat phosphorus in urban sewage, which is also part of the treatment process. After phosphorus removal, ICP (Inductively Coupled Phosphorus) analysis is often used. A commonly used ICP method is the molybdenum-antimony photometric method, which involves heating the mixture using microwave heating equipment. The rule for microwave heating is that no metal materials should be placed inside the equipment because microwaves are completely reflected from metal surfaces, similar to how light is reflected when it hits a mirror. However, if microwaves act on non-metallic dielectrics, the properties of the dielectric determine that the microwaves will be absorbed and penetrate, generating a high-frequency electric field. The main characteristic of microwave heating is the dielectric heating effect. Positive ions and nearby negative electrons in a dielectric exist in pairs. These electrons are tightly bound and do not interact with each other; the overall electric field strength of the medium is zero for the outside world. If a strong electric field is applied to the dielectric, the positive and negative electron pairs will immediately rearrange. If the electric field is alternating and high-frequency, the frequent rotation of electron pairs between molecules will cause them to vibrate and generate heat due to friction.

[0004] However, when using microwave heating equipment, the mixture in the Kjeldahl flask is used as the object to be heated. But because the Kjeldahl flask will also get hot after heating, it is not easy to remove it by hand. When the current Kjeldahl flask clamping device is used to clamp the Kjeldahl flask, the mixture inside must be poured into a 50mL colorimetric tube. At this time, the clamping problem will occur. If the clamping is not secure, the mixture will often splash out, causing pollution and corrosion to the surrounding environment. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides an ICP method for determining total phosphorus in urban wastewater after treatment with chemical phosphorus removal agents. This method effectively avoids the shortcomings of existing technologies where, during the ICP determination of phosphorus in urban wastewater treated with chemical phosphorus removal agents, the mixture in the Kjeldahl flask is heated using a microwave heating device. This process can lead to insecure clamping of the mixture during the clamping process, causing it to spill out and resulting in contamination and corrosion of the surrounding environment.

[0006] To overcome the shortcomings of existing technologies, this invention provides a solution for the ICP determination of total phosphorus in urban wastewater after treatment with chemical phosphorus removal agents, as detailed below:

[0007] An ICP method for determining total phosphorus in urban wastewater after treatment with chemical phosphorus removal agents includes:

[0008] Pretreatment of wastewater samples after chemical phosphorus removal agent treatment of urban sewage;

[0009] The pretreatment of wastewater samples after treatment with chemical phosphorus removal agents for urban wastewater includes:

[0010] Step 1: ICP-MS analysis;

[0011] Step 2: Molybdenum-antimony photometric analysis;

[0012] During the photometric analysis of molybdenum and antimony, the following steps are performed when heating the mixture in the Kjeldahl flask using a microwave heating device:

[0013] Step 2-1: Power is supplied to the magnetron 25 connected to the copper wire 24 via the power supply 23, thereby heating the Kjeldahl flask inside using microwave radiation.

[0014] Step 2-2: After heating is complete, the mixture is transferred into the colorimetric tube. By holding the plastic handle 21, the Kjeldahl flask 4 is lifted out of the heating hood 4 via the Y-shaped piece 8 and a pair of support plates 7 and the traction ring 6. Then, the arched handle 918 in the handle assembly 9 is shaken. The rotation center at one end of the handle rotates, so that the outer stop bead positioning cavity 926 is pulled by the copper traction rope 919 via the steel cable stop bead 925. This allows it to run on the first wheel 910 and the second wheel 915. The arched handle 918 can be restored by the disc spring 924.

[0015] Steps 2-3: Pulling a pair of copper rope loops 1022 in the lower oblique locking part 10 via the copper traction rope 919, thereby pulling a pair of stop bars 1018 to move in the strip opening 1014, causing the mounting pieces 1019 on both sides to press the disc spring 1010, causing the connecting piece 1017 to rotate around the rotating rod 1015, transferring the mixture inside into the colorimetric tube.

[0016] The molybdenum-antimony photometric method analysis includes: taking 25.0 mL of wastewater sample from urban sewage treated with chemical phosphorus removal agent and placing it in a Kjeldahl flask, adding several glass beads, 2 mL of (1+1) sulfuric acid and 2-5 mL of nitric acid to form a mixture, and placing the Kjeldahl flask containing the mixture into a microwave heating device to heat until white fumes are emitted. If the mixture is not clear and transparent, after cooling, add 5 mL of nitric acid and heat again until white fumes are emitted to obtain a transparent mixture; after cooling, add about 30 mL of water and heat to boiling for about 5 minutes; after cooling, add 1 drop of phenolphthalein indicator, add NaOH mixture until it just turns slightly red, and then add 1 mol / L H2SO4 mixture until the slight red just fades. Mix the mixture thoroughly and transfer it to a 50 mL colorimetric tube; if the mixture is turbid, filter it with filter paper, wash the Kjeldahl flask and filter paper with water, transfer them to the colorimetric tube, dilute to the mark, and number them for subsequent analysis.

[0017] The ICP-MS analysis includes: blank samples and quality control samples are directly entered into ICP-MS analysis after being numbered; wastewater samples are added with nitric acid to make the content about 2%, and the supernatant is taken for analysis.

[0018] The microwave heating device includes: a rectangular platform 2, a support platform 3 fixed to one end of the top wall of the rectangular platform 2, a heating cover 4 with glass embedded in its outer wall fixed to the top wall of the support platform 3, a Kjeldahl flask 4 disposed inside the heating cover 4, a hoop ring 6 fixedly connected to the top of the side wall of the Kjeldahl flask 4 by a static fit, and support plates 7 perpendicular to the top wall of the hoop ring 6 fixed to both ends of the top wall of the hoop ring 6, with a Y-shaped member 8 screwed onto a pair of support plates 7. A handle assembly 9 is fixed on the bottom wall of the Y-shaped component 8. A magnetron 25 is fixed in the heating hood 4. Copper wires 24 are connected to both ends of the magnetron 25. The other ends of the pair of copper wires 24 are exposed through the heating hood 4 and a copper sheet 22 is fixed thereon. The copper sheet 22 is electrically connected to a power supply 23. The power supply 23 is fixed on the top wall of the rectangular platform 2 and is located on one side of the Kjeldahl flask 4. A plastic handle 21 is fixed at the tail of the Y-shaped component 8 and at the tail of the handle assembly 9.

[0019] The handle assembly 9 includes: an arched handle 918, a copper traction rope 919, and a stop bead positioning cavity 926. The stop bead positioning cavity 926 is fixed on the top wall of the arched handle 918. A steel cable stop bead 925 is provided in the stop bead positioning cavity 926. The top wall of the steel cable stop bead 925 is provided with a copper traction rope 919. An oblique locking component 10 is fixed at the lower part of the handle assembly 9.

[0020] The inclined locking component 10 includes: a pair of arched hoop members 1013, the pair of hoop members 1013 being located on one side of the locking component positioning hoop 1012, and the top wall of the locking component positioning hoop 1012 being fixedly connected to the handle assembly 9.

[0021] The arched handle 918 is screwed to both sides with a pair of positioning pieces 916. The pair of positioning pieces 916 are fixed to one side wall of the annular positioning member 912. The annular positioning member 912 has a through opening 913 near the pair of positioning pieces 916 and between them. The annular positioning member 912 has a guide opening 914 near the pair of positioning pieces 916 and between them. The guide opening 914 and the through opening 913 are connected.

[0022] A second wheel 915 is screwed into the guide port 914. A first wheel assembly piece 917 is fixed on the top wall of a pair of positioning pieces 916. A first wheel 910 is screwed between the pair of first wheel assembly pieces 917. A disc spring assembly piece 921 is fixed between the pair of positioning pieces 916 on the side of the first wheel assembly piece 917 that is farther away from the through port 913.

[0023] The disc spring assembly piece 921 has a frustum-shaped opening 922. The tail of the frustum-shaped opening 922 and the bottom of the disc spring assembly piece 921 are fixedly connected to a cylindrical stop 923. The copper traction rope 919 passes through the stop 923 and the frustum-shaped opening 922 in sequence. In addition, the copper traction rope 919 passes through the first pulley 910 and the second pulley 915 and enters the cylindrical positioning piece 912 downward to the oblique locking piece 10. The second disc spring 924 is fixed between the stop 923 and the positioning bead positioning cavity 926.

[0024] The locking member positioning clamp 1012 and the annular positioning member 912 are fixedly connected. The lower part of the locking member positioning clamp 1012 is fixedly connected to the positioning cover 1023. The positioning cover 1023 has a pair of strip-shaped openings 1014 at each of its vertical ends. Each pair of vertically opposite strip-shaped openings 1014 has a movable stop bar 1018. Each pair of stop bars 1018 has a plate-shaped positioning member 1016 fixed at each of its vertical ends. Each plate-shaped positioning member 1016 is connected to a rotating rod 1015. Screwed onto the positioning cover 1023, each of the sheet-like positioning members 1016 has a connecting piece 1017 fixed on its sidewall, and each pair of connecting pieces 1017 is fixed to one side of a hoop 1013; each of the sheet-like positioning members 1016 has an assembly piece 1019 fixed to its top wall, and a disc spring 1010 is fixed between each pair of assembly pieces 1019 on the same side; each bend of the locking member positioning hoop 1012 has a rotating rod 1021 screwed onto its inner ring, and the copper traction rope 919 passes under a pair of rotating rods 1021. In addition, the lower part of the copper traction rope 919 is fixed to a pair of copper rope loops 1022, and the pair of copper rope loops 1022 are respectively hooped onto the stop bar 1018.

[0025] The beneficial effects of this invention are as follows:

[0026] This invention supplies power to the magnetron 25 connected to the copper wire 24 via power supply 23, thereby heating the Kjeldahl flask inside using microwave radiation. After heating, the mixture is transferred into the colorimetric tube. This is done by gripping the plastic handle 21, via the Y-shaped member 8, via a pair of support plates 7 and traction rings 6, after raising the Kjeldahl flask 4 out of the heating hood 4, by shaking the arched handle 918 in the handle assembly 9, rotating the rotation center at one end of it, thereby causing the external stop bead positioning cavity 926 to be pulled by the copper traction rope 919 via the steel cable stop bead 925, thus allowing it to run on the first wheel 910 and the second wheel 915. The second disc spring 924 can restore the arched handle 918. Here, the copper traction rope 919 pulls a pair of copper rope rings 1022 in the lower oblique locking member 10, thereby pulling a pair of stop bars 1018 at the strip opening 1014. The movement causes the mounting plates 1019 on both sides to press against the disc spring 1010, and the connecting plate 1017 to rotate around the rotating rod 1015. This allows the clamps 1013 on both sides to be firmly clamped, and also to the lower part of the Kjeldahl flask 4. This makes it very convenient to transfer the mixture inside into the colorimetric tube. The operation is reliable and convenient, and will not cause the mixture to splash out, nor will it cause pollution or corrosion to the surrounding environment.

[0027] This effectively avoids the defects of existing technologies where, after treating urban sewage with chemical phosphorus removal agents and then using ICP determination, the mixture in the Kjeldahl flask is heated using a microwave heating device. When the clamping device is used to clamp the Kjeldahl flask, the mixture may not be securely connected, causing it to burst out and resulting in pollution and corrosion to the surrounding environment. Attached Figure Description

[0028] Figure 1 This is a flowchart of steps 1 to 2 of the present invention.

[0029] Figure 2 This is a flowchart of steps 2-1 to 2-3 of the present invention.

[0030] Figure 3 This is a perspective view of the microwave heating device of the present invention.

[0031] Figure 4 This is a side view of the microwave heating device of the present invention.

[0032] Figure 5 yes Figure 4 A cross-sectional schematic diagram of XX in the diagram.

[0033] Figure 6 This is a perspective view of the handle assembly of the present invention.

[0034] Figure 7 This is a front view of the handle assembly of the present invention.

[0035] Figure 8yes Figure 7 A schematic diagram of the cross-section of YY.

[0036] Figure 9 yes Figure 8 Schematic diagram at point Z in the middle.

[0037] Figure 10 This is a schematic diagram of the oblique card ejector of the present invention.

[0038] Figure 11 yes Figure 10 Schematic diagram at point W in the middle.

[0039] Figure 12 This is a back plan view of the oblique card ejector of the present invention.

[0040] Figure 13 yes Figure 12 A schematic diagram of the cross-section of VV in the diagram. Detailed Implementation

[0041] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] like Figures 1-13 As shown, the ICP determination method for total phosphorus in urban wastewater after treatment with chemical phosphorus removal agents includes:

[0043] Pretreatment of wastewater samples after chemical phosphorus removal agent treatment of urban sewage;

[0044] The pretreatment of wastewater samples after treatment with chemical phosphorus removal agents for urban wastewater includes:

[0045] Step 1: ICP-MS analysis;

[0046] Step 2: Molybdenum-antimony photometric analysis;

[0047] During the photometric analysis of molybdenum and antimony, the following steps are performed when heating the mixture in the Kjeldahl flask using a microwave heating device:

[0048] Step 2-1: Power is supplied to the magnetron 25 connected to the copper wire 24 via the power supply 23, thereby heating the Kjeldahl flask inside using microwave radiation.

[0049] Step 2-2: After heating is complete, the mixture is transferred into the colorimetric tube. By holding the plastic handle 21, the Kjeldahl flask 4 is lifted out of the heating hood 4 via the Y-shaped piece 8 and a pair of support plates 7 and the traction ring 6. Then, the arched handle 918 in the handle assembly 9 is shaken. The rotation center at one end of the handle rotates, so that the outer stop bead positioning cavity 926 is pulled by the copper traction rope 919 via the steel cable stop bead 925. This allows it to run on the first wheel 910 and the second wheel 915. The arched handle 918 can be restored by the disc spring 924.

[0050] Steps 2-3: Pulling a pair of copper rope loops 1022 in the lower oblique locking part 10 via the copper traction rope 919 pulls a pair of stop bars 1018 to move in the strip opening 1014, causing the mounting pieces 1019 on both sides to press the disc spring 1010, and causing the connecting piece 1017 to rotate around the rotating rod 1015, thereby securing the clamps 1013 on both sides and securing the lower part of the Kjeldahl flask 4. This makes it very convenient to transfer the mixture inside into the colorimetric tube, and the operation is reliable and convenient, without causing the mixture to splash out or causing pollution or corrosion to the surrounding environment.

[0051] The molybdenum-antimony photometric method analysis includes: taking 25.0 mL of wastewater sample from urban sewage treated with chemical phosphorus removal agent and placing it in a Kjeldahl flask, adding several glass beads, 2 mL of (1+1) sulfuric acid and 2-5 mL of nitric acid to form a mixture, and placing the Kjeldahl flask containing the mixture into a microwave heating device to heat until white fumes are emitted. If the mixture is not clear and transparent, after cooling, add 5 mL of nitric acid and heat again until white fumes are emitted to obtain a transparent mixture; after cooling, add about 30 mL of water and heat to boiling for about 5 minutes; after cooling, add 1 drop of phenolphthalein indicator, add NaOH mixture until it just turns slightly red, and then add 1 mol / L H2SO4 mixture until the slight red just fades. Mix the mixture thoroughly and transfer it to a 50 mL colorimetric tube; if the mixture is turbid, filter it with filter paper, wash the Kjeldahl flask and filter paper with water, transfer them to the colorimetric tube, dilute to the mark, and number them for subsequent analysis.

[0052] The ICP-MS analysis includes: blank samples and quality control samples are directly entered into ICP-MS analysis after being numbered; wastewater samples are added with nitric acid to make the content about 2%, and the supernatant (or filtered through a 0.45 μm filter membrane) is taken for analysis.

[0053] The microwave heating device includes: a rectangular platform 2, a support platform 3 fixed to one end of the top wall of the rectangular platform 2, a heating cover 4 with glass embedded in its outer wall fixed to the top wall of the support platform 3, a Kjeldahl flask 4 inside the heating cover 4, a hoop ring 6 fixed to the top of the side wall of the Kjeldahl flask 4 by a static fit, support plates 7 fixed to both ends of the top wall of the hoop ring 6 and perpendicular to the top wall of the hoop ring 6, the top wall of the hoop ring 6 and the support plates can be formed into an integral structure by stamping; a Y-shaped member 8 screwed onto a pair of support plates 7, a handle assembly 9 fixed to the bottom wall of the Y-shaped member 8, the bottom wall of the Y-shaped member 8 and the handle assembly 9 can be formed into an integral structure by stamping; a magnetron 25 fixed inside the heating cover 4, copper wires 24 connected to both ends of the magnetron 25, the other ends of the pair of copper wires 24 penetrating the heating cover 4. A copper sheet 22 is fixedly installed, which is electrically connected to a power supply 23. The power supply 23 is fixed on the top wall of the rectangular platform 2 and is located on one side of the Kjeldahl flask 4. A plastic handle 21 is fixed at the tail of the Y-shaped member 8 and at the tail of the handle assembly 9.

[0054] The handle assembly 9 includes: an arched handle 918, a copper traction rope 919, and a stop bead positioning cavity 926. The stop bead positioning cavity 926 is fixed on the top wall of the arched handle 918. A steel cable stop bead 925 is provided in the stop bead positioning cavity 926. The copper traction rope 919 is provided on the top wall of the steel cable stop bead 925. The steel cable stop bead 925 and the copper traction rope 919 can be formed into an integral structure by stamping. An oblique locking component 10 is fixed at the lower part of the handle assembly 9.

[0055] The inclined locking component 10 includes a pair of arched clamps 1013, which are located on one side of the locking component positioning clamp 1012. The top wall of the locking component positioning clamp 1012 is fixedly connected to the handle assembly 9. The top wall of the locking component positioning clamp 1012 and the handle assembly 9 can be formed into an integral structure by stamping. The plastic handle has the effect of reducing heat conduction and preventing burns.

[0056] Power is supplied to the magnetron 25 connected to the copper wire 24 via power supply 23, thereby heating the Kjeldahl flask inside using microwave radiation. After heating, the mixture is transferred into the colorimetric tube. This is done by gripping the plastic handle 21, which is then pulled by the Y-shaped member 8 and a pair of support plates 7 and traction rings 6. After the Kjeldahl flask 4 is lifted out of the heating hood 4, the arched handle 918 in the handle assembly 9 is cranked, rotating through the rotation center at one end. This allows the external stop bead positioning cavity 926 to be positioned via steel... The stop bead 925 pulls the copper traction rope 919, causing it to run between the first pulley 910 and the second pulley 915. The arched handle 918 can be restored via the disc spring 924. Here, the copper traction rope 919 pulls a pair of copper rope loops 1022 in the lower oblique locking part 10, thereby pulling a pair of stop bars 1018 to move in the strip opening 1014. This causes the mounting plates 1019 on both sides to press the disc spring 1010, causing the connecting plate 1017 to rotate around the rotating rod 1015. This allows the clamps 1013 on both sides to be clamped, and also clamps the lower part of the Kjeldahl flask 4. This is very convenient for transferring the mixture inside into the colorimetric tube. The operation is reliable and convenient, and it will not cause the mixture to splash out or cause pollution or corrosion to the surrounding environment.

[0057] Here, a pair of positioning pieces 916 are screwed onto both sides of the arched handle 918. Both of the positioning pieces 916 are fixed to one side wall of the annular positioning member 912. The annular positioning member 912 has a through opening 913 near the pair of positioning pieces 916 and between them. The annular positioning member 912 also has a guide opening 914 near the pair of positioning pieces 916 and between them. The guide opening 914 and the through opening 913 are connected.

[0058] A second wheel 915 is screwed into the guide port 914. A first wheel assembly piece 917 is fixed on the top wall of a pair of positioning pieces 916. A first wheel 910 is screwed between the pair of first wheel assembly pieces 917. A disc spring assembly piece 921 is fixed between the pair of positioning pieces 916 on the side of the first wheel assembly piece 917 that is farther away from the through port 913.

[0059] The disc spring assembly piece 921 has a frustum-shaped opening 922. The tail end is fixed to the bottom of the disc spring assembly 921 with a cylindrical stop 923. The copper traction rope 919 passes through the stop 923 and the frustum-shaped opening 922 in sequence. The copper traction rope 919 passes through the first wheel 910 and the second wheel 915 and enters the cylindrical positioning member 912 downward to the oblique locking member 10. The second disc spring 924 is fixed between the stop 923 and the positioning bead positioning cavity 926. By shaking the arched handle 918 in the handle assembly 9, the rotation center at one end of the handle rotates, so that the positioning bead positioning cavity 926 outside the handle is pulled by the copper traction rope 919 through the steel cable stop bead 925, so that it rotates on the first wheel 910 and the second wheel 915. The arched handle 918 can be restored by the second disc spring 924.

[0060] The locking member positioning clamp 1012 and the annular positioning member 912 are fixedly connected. The lower part of the locking member positioning clamp 1012 is fixedly connected to the positioning cover 1023. The positioning cover 1023 has a pair of strip-shaped openings 1014 at each of its vertical ends. Each pair of vertically opposite strip-shaped openings 1014 has a movable stop bar 1018. Each pair of stop bars 1018 has a plate-shaped positioning member 1016 fixed at each of its vertical ends. Each plate-shaped positioning member 1016 is connected to a rotating rod 1015. Screwed onto the positioning cover 1023, each of the sheet-like positioning members 1016 has a connecting piece 1017 fixedly mounted on its sidewall, and each pair of connecting pieces 1017 is fixedly connected to one side of a clamp 1013; each of the sheet-like positioning members 1016 has an assembly piece 1019 fixedly mounted on its top wall, and a disc spring 1010 is fixedly mounted between each pair of assembly pieces 1019 on the same side; the locking member positioning clamp 1012 At each bend, a rotating rod 1021 is screwed onto the inner ring. The copper traction rope 919 passes under the pair of rotating rods 1021. The lower part of the copper traction rope 919 is fixed to a pair of copper rope loops 1022. The pair of copper rope loops 1022 are respectively clamped onto the stop bar 1018. By pulling the pair of copper rope loops 1022 in the lower oblique locking part 10 through the copper traction rope 919, the pair of stop bars 1018 can be pulled to move in the strip opening 1014, so that the mounting pieces 1019 on both sides can press the disc spring 1010, and the connecting piece 1017 can rotate around the rotating rod 1015. This can secure the clamps 1013 on both sides and secure the lower part of the Kjeldahl flask 4. The operation is reliable and convenient, and will not cause the mixture to splash out, nor will it cause pollution or corrosion to the surrounding environment.

[0061] Power is supplied to the magnetron 25, which is connected to the copper wire 24 via power source 23, to heat the Kjeldahl flask inside using microwave radiation. After heating, the mixture is transferred to the colorimetric tube. This is done by gripping the plastic handle 21, which is then pulled by the Y-shaped piece 8 and a pair of support plates 7 and traction rings 6. After the Kjeldahl flask 4 is lifted out of the heating hood 4, the arched handle 918 in the handle assembly 9 is cranked. The rotation center at one end of the handle rotates, causing the external stop bead positioning cavity 926 to be pulled by the copper traction rope 919 via the steel cable stop bead 925, thus allowing the flask to run between the first roller 910 and the second roller 915. The arched handle 918 can be restored via the disc spring 924; here, the pair of copper rope loops 1022 in the lower oblique locking part 10 are pulled by the copper traction rope 919, thereby pulling the pair of stop bars 1018 to move in the strip opening 1014, so that the mounting pieces 1019 on both sides press the disc spring 1010, and the connecting piece 1017 rotates around the rotating rod 1015, thereby allowing the clamps 1013 on both sides to be clamped, and clamping the lower part of the Kjeldahl flask 4, which is very convenient for transferring the mixture inside into the colorimetric tube. The operation is reliable and convenient, and the mixture will not splash out, nor will it cause pollution or corrosion to the surrounding environment.

[0062] The present invention has been described above by way of examples. It will be apparent to those skilled in the art that the present disclosure is not limited to the examples described above, and various changes, modifications and substitutions can be made without departing from the scope of the present invention.

Claims

1. A method for the determination of total phosphorus in municipal wastewater treated with chemical phosphorus removal agents by ICP, characterized in that, include: Pretreatment of wastewater samples after chemical phosphorus removal agent treatment of urban sewage; The pretreatment of wastewater samples after treatment with chemical phosphorus removal agents for urban wastewater includes: Step 1: ICP-MS analysis; Step 2: Molybdenum-antimony photometric analysis; During the photometric analysis of molybdenum and antimony, the following steps are performed when heating the mixture in the Kjeldahl flask using a microwave heating device: Step 2-1: Power is supplied to the magnetron connected by the copper wire via the power supply of the microwave heating equipment, thereby performing microwave radiation heating on the Kjeldahl flask inside. Step 2-2: After heating is complete, the mixture is transferred into the colorimetric tube. By holding the plastic handle, the Kjeldahl flask is lifted out of the heating hood via the Y-shaped piece and a pair of support plates and traction rings. Then, the arched handle in the handle assembly is turned by rotating the rotating center at one end. This causes the outer stop bead positioning cavity to be pulled by the copper traction rope via the steel cable stop bead, thus making it run on the first and second wheels. The arched handle can be restored by the disc spring. Steps 2-3: Pull a pair of copper rope rings in the lower oblique locking part by the copper traction rope, thereby pulling a pair of stop bars to move in the strip-shaped opening, so that the assembly plates on both sides press the disc spring one, and the connecting plate rotates around the rotating rod two, transferring the mixture inside into the colorimetric tube. The microwave heating device includes: a rectangular platform, a support platform fixed to one end of the top wall of the rectangular platform, a heating cover with glass embedded in its outer wall fixed to the top wall of the support platform, a Kjeldahl flask inside the heating cover, a hoop ring fixed to the top of the side wall of the Kjeldahl flask in a static fit, support plates fixed to both ends of the top wall of the hoop ring and perpendicular to the top wall of the hoop ring, a Y-shaped component screwed onto the pair of support plates, a handle assembly fixed to the bottom wall of the Y-shaped component, a magnetron fixed inside the heating cover, copper wires connected to both ends of the magnetron, a copper sheet fixed to the other end of the pair of copper wires through the heating cover, the copper sheet being electrically connected to a power source, the power source being fixed to the top wall of the rectangular platform and located on one side of the Kjeldahl flask, and a plastic handle fixed to the tail of the Y-shaped component and at the tail of the handle assembly; The handle assembly includes: an arched handle, a copper traction rope, and a stop bead positioning cavity. The stop bead positioning cavity is fixed on the top wall of the arched handle. A steel cable stop bead is provided in the stop bead positioning cavity. A copper traction rope is provided on the top wall of the steel cable stop bead. An oblique locking component is fixed at the lower part of the handle assembly. The inclined locking component includes: a pair of arched hoop members, the pair of hoop members being located on one side of the locking component positioning hoop, and the top wall of the locking component positioning hoop being fixedly connected to the handle assembly; A pair of positioning plates are screwed onto both sides of the arched handle. Both of the positioning plates are fixed to one side wall of the annular positioning member. The annular positioning member has a through opening near the pair of positioning plates and between them. The annular positioning member also has a guide opening near the pair of positioning plates and between them. The guide opening and the through opening are connected. The guide hole is connected with a coil two, a pair of positioning sheet top wall is equipped with coil one assembly sheet, a pair of coil one assembly sheet is connected with coil one, a pair of positioning sheet is equipped with disc spring one assembly sheet in the distance of coil one assembly sheet farther from the through hole; The disc spring one assembly sheet is opened with a circular truncated cone hole, the circular truncated cone hole tail is connected with ring column stopper in the disc spring one assembly sheet bottom, the copper traction rope is sequentially through the stopper and the circular truncated cone hole, and the copper traction rope is inserted into the ring column positioning member through coil one and coil two to the downward inclined clamping member, the stopper is connected with disc spring two between the stopper and the stopper bead positioning cavity; The clamping member positioning hoop is connected with the ring column positioning member, the clamping member positioning hoop lower part is connected with the positioning cover, the positioning cover vertical two ends are respectively opened with a pair of strip holes, each pair of vertical opposite strip holes can be respectively connected with the stop strip, a pair of stop strips vertical two ends are respectively equipped with sheet positioning member; Each sheet positioning member is connected with the positioning cover through the rotating rod two, each sheet positioning member edge wall is equipped with the link sheet, each pair of link sheets is connected on one hoop one side; Each sheet positioning member top wall is connected with the assembly sheet, each pair of same side assembly sheets is equipped with disc spring one; The rotating rod one is connected with the rotating rod one in the clamping member positioning hoop each bending inner ring, the copper traction rope is through a pair of rotating rod lower part, and the copper traction rope lower part is respectively connected with a pair of copper rope ring, a pair of copper rope rings is respectively connected with the stop strip.

Images