Tungsten ore beneficiation wastewater treatment result analysis method

Abstract

The invention relates to the technical field of beneficiation wastewater treatment, and discloses a tungsten ore beneficiation wastewater treatment result analysis method which comprises the following steps: step 1, introducing beneficiation wastewater into three different reaction tanks, and simultaneously sampling and storing for later comparison; 2, adjusting the pH value of the beneficiation wastewater in the first reaction tank in the step 1, and then adding a defoaming agent and a first flocculating agent for mixing and stirring; the device is scientific and reasonable in structure and safe and convenient to use, can further effectively reduce COD of discharged water, ensures that various indexes reach the standard, enables a wastewater treatment process to be more stable and reliable, guarantees continuous production of a dressing plant, meanwhile, obviously reduces the treatment cost of the beneficiation wastewater, ensures that other indexes such as suspended matters in treated supernate are qualified, is suitable for popularization and application, and has a wide application prospect. Meanwhile, the pH value of the mineral processing process wastewater is adjusted, and a flocculating agent is adopted for flocculation treatment, so that all the treated wastewater can reach the recycling standard.

Description

Technical Field

[0001] The invention relates to the technical field of mineral processing wastewater treatment, in particular to a method for analyzing treatment results of tungsten ore mineral processing wastewater. Background Art

[0002] With the continuous consumption of coarse-grained, easy-to-select weak magnetic mineral resources, the characteristics of "poor, fine and mixed" ores are becoming increasingly prominent. This type of ore is difficult to sort and has a low recycling rate. High-gradient magnetic separation is the most commonly used and economical method for processing weak magnetic minerals. Among them, the vertical ring high-gradient magnetic separator is the most widely used magnetic separation equipment in the existing technology. The vertical ring high-gradient magnetic separator mainly uses the comprehensive force field composed of magnetic force, pulsating fluid force and gravity to sort ores. It has the advantages of large enrichment ratio, high mineral processing efficiency, large processing capacity and low mineral processing cost. The vertical ring high-gradient magnetic separator is a device that uses a higher magnetic field generated by a cooled low-temperature excitation coil to wet-select weak magnetic ores. Its sorting principle is mainly to use the magnetic field generated by the excitation coil to form a magnetic field circuit through the upper and lower magnetic yokes. A swivel is set between the upper and lower magnetic yokes and the excitation coil and a magnetic medium is installed. The lower part of the swivel is immersed in the ore slurry. Relying on the rotation of the swivel, the magnetized medium adsorbs the magnetic particles of the mineral on the surface of the magnetic medium.

[0003] For example, the Chinese patent with patent application number 202110851548.7 is a method for analyzing the treatment results of tungsten ore beneficiation wastewater. In this invention, the composite magnetic system includes a horizontally arranged first coil and a vertically (or inclined) arranged second coil. The first coil, the first magnetic pole and the second magnetic pole cooperate to generate a magnetic field in the main sorting area, and the second coil, the first magnetic pole and the third magnetic pole cooperate to generate a magnetic field in the middle ore end sorting area. The two magnetic systems ensure that the magnetic field strength in the middle ore end sorting area is basically close to that in the main sorting area, thereby solving the problem of rapid attenuation of the magnetic field strength at the middle ore end in the prior art. During the rotation of the sorting ring, it passes through the main sorting area and the middle ore end sorting area in sequence, and the magnetic particles can be firmly adsorbed on the magnetic medium of the sorting ring and will not return, affecting the sorting indicators; in addition, the two magnetic systems share a first magnetic pole, which makes the structure of the entire product more compact and reduces the height and manufacturing cost of the product.

[0004] However, the above patent will generate a large amount of dust during operation, which will cause certain pollution and damage to the surrounding environment and the health of the workers. In addition, when the above patent uses a vertical ring high gradient magnetic separator for screening, some ores may block the screening plate, which seriously affects the classification and screening efficiency of the ore. Summary of the invention

[0005] The purpose of the present invention is to provide a method for analyzing the treatment results of tungsten ore beneficiation wastewater, which solves the problems raised in the background technology.

[0006] The present application embodiment provides a method for analyzing the treatment results of tungsten ore beneficiation wastewater, comprising the following steps: Step 1: Introduce the mineral processing wastewater into three different reaction tanks, and take samples and save them at the same time for later comparison; Step 2: adjusting the pH value of the mineral processing wastewater in the first reaction tank in step 1, and then adding a defoamer and a first flocculant to mix and stir; Step 3: adjusting the pH value of the mineral processing wastewater in the second reaction tank in step 1, and then adding a defoamer and a second flocculant to mix and stir; Step 4: adjusting the pH value of the mineral processing wastewater in the third reaction tank in step 1, and then adding a defoamer and a third flocculant to mix and stir; Step 5, stirring the reaction and then standing to settle; Step 6: After standing and settling, the supernatant is discharged into the clean water tank; Step 7: Add 120 mg / L sodium chlorate to the supernatant, stir and react, and then proceed to the next step; Step 8: After precipitation, test the sample. If the sample is qualified, proceed to the next step. If the sample is unqualified, continue to add sodium chlorate. Step 9: The pH value is neutral and qualified, then discharged; Step 10: After discharge, sample and test the wastewater.

[0007] Optionally, the first flocculant in step 2 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 8-16:1.

[0008] Optionally, the second flocculant in step three is prepared from raw materials including the following components: polyaluminium chloride and polyacrylamide, and the mass ratio of polyaluminium chloride to polyacrylamide is 8-16:1.

[0009] Optionally, the third flocculant in step 4 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 8-16:1.

[0010] Optionally, the pH value adjusted in step 2 is 6.5-8.5.

[0011] Optionally, the pH value adjusted in step three is 8.5-9.5.

[0012] Optionally, the pH value adjusted in step 4 is 6.5 to 8.5.

[0013] Optionally, in step nine, the pH value is detected 5-7 times, a highest value and a lowest value are removed, and then an average value is taken.

[0014] Optionally, the sampling detection rate in step ten is 0.5-1L / M3.

[0015] Compared with the prior art, the technical solution of this application has the following beneficial effects: The technical solution of this application has a scientific and reasonable structure, is safe and convenient to use, can further effectively reduce the COD of external drainage, ensure that various indicators meet the standards, make the wastewater treatment process more stable and reliable, and safeguard the continuous production of the ore dressing plant. At the same time, the cost of ore dressing wastewater treatment is significantly reduced, and other indicators such as suspended matter in the supernatant after treatment are also qualified, which is suitable for promotion and use. At the same time, by adjusting the pH value of the ore dressing process wastewater and using flocculants for flocculation treatment, all the treated wastewater can meet the reuse standards, thereby greatly improving the reuse rate of this device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 The present invention is a schematic structural diagram of the overall steps of a method for analyzing the results of tungsten ore beneficiation wastewater treatment. DETAILED DESCRIPTION

[0017] Example 1 See also Figure 1 The present invention provides a technical solution: a method for analyzing the treatment results of tungsten ore beneficiation wastewater, comprising the following steps: Step 1: Introduce the mineral processing wastewater into three different reaction tanks, and take samples and save them at the same time for later comparison; Step 2: adjusting the pH value of the mineral processing wastewater in the first reaction tank in step 1, and then adding a defoamer and a first flocculant to mix and stir; Step 3: adjusting the pH value of the mineral processing wastewater in the second reaction tank in step 1, and then adding a defoamer and a second flocculant to mix and stir; Step 4: adjusting the pH value of the mineral processing wastewater in the third reaction tank in step 1, and then adding a defoamer and a third flocculant to mix and stir; Step 5, stirring the reaction and then standing to settle; Step 6: After standing and settling, drain the supernatant into the clean water tank; Step 7: Add 120 mg / L sodium chlorate to the supernatant, stir the reaction and proceed to the next step; Step 8: After precipitation, test the sample. If the sample is qualified, proceed to the next step. If the sample is unqualified, continue to add sodium chlorate. Step 9: The pH value is neutral and qualified, then discharged; Step 10: After discharge, sample and test the wastewater.

[0018] In an embodiment of the present application, the first flocculant in step 2 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 10:1.

[0019] In an embodiment of the present application, the second flocculant in step three is prepared from raw materials including the following components: polyaluminium chloride and polyacrylamide, and the mass ratio of polyaluminium chloride to polyacrylamide is 10:1.

[0020] In an embodiment of the present application, the third flocculant in step 4 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 10:1.

[0021] In an embodiment of the present application, the pH value adjusted in step 2 is 6.5 to 8.5.

[0022] In an embodiment of the present application, the pH value adjusted in step three is 8.5-9.5.

[0023] In an embodiment of the present application, the pH value adjusted in step 4 is 6.5-8.5.

[0024] In an embodiment of the present application, the pH value is detected 5-7 times in step nine, a highest value and a lowest value are removed, and then the average value is taken.

[0025] In an embodiment of the present application, the sampling detection rate in step ten is 0.5-1L / M3.

[0026] Example 2 See also Figure 1 The present invention provides a technical solution: a method for analyzing the treatment results of tungsten ore beneficiation wastewater, comprising the following steps: Step 1: Introduce the mineral processing wastewater into three different reaction tanks, and take samples and save them at the same time for later comparison; Step 2: adjusting the pH value of the mineral processing wastewater in the first reaction tank in step 1, and then adding a defoamer and a first flocculant to mix and stir; Step 3: adjusting the pH value of the mineral processing wastewater in the second reaction tank in step 1, and then adding a defoamer and a second flocculant to mix and stir; Step 4: adjusting the pH value of the mineral processing wastewater in the third reaction tank in step 1, and then adding a defoamer and a third flocculant to mix and stir; Step 5, stirring the reaction and then standing to settle; Step 6: After standing and settling, the supernatant is discharged into the clean water tank; Step 7: Add 120 mg / L sodium chlorate to the supernatant, stir the reaction and proceed to the next step; Step 8: After precipitation, test the sample. If the sample is qualified, proceed to the next step. If the sample is unqualified, continue to add sodium chlorate. Step 9: The pH value is neutral and qualified, then discharged; Step 10: After discharge, sample and test the wastewater.

[0027] In an embodiment of the present application, the first flocculant in step 2 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 8:1.

[0028] In an embodiment of the present application, the second flocculant in step three is prepared from raw materials including the following components: polyaluminium chloride and polyacrylamide, and the mass ratio of polyaluminium chloride to polyacrylamide is 8:1.

[0029] In an embodiment of the present application, the third flocculant in step 4 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 8:1.

[0030] In an embodiment of the present application, the pH value adjusted in step 2 is 6.5 to 8.5.

[0031] In an embodiment of the present application, the pH value adjusted in step three is 8.5-9.5.

[0032] In an embodiment of the present application, the pH value adjusted in step 4 is 6.5-8.5.

[0033] In an embodiment of the present application, the pH value is detected 5-7 times in step nine, a highest value and a lowest value are removed, and then the average value is taken.

[0034] In an embodiment of the present application, the sampling detection rate in step ten is 0.5-1L / M3.

[0035] Example 3 See also Figure 1 The present invention provides a technical solution: a method for analyzing the treatment results of tungsten ore beneficiation wastewater, comprising the following steps: Step 1: Introduce the mineral processing wastewater into three different reaction tanks, and take samples and save them at the same time for later comparison; Step 2: adjusting the pH value of the mineral processing wastewater in the first reaction tank in step 1, and then adding a defoamer and a first flocculant to mix and stir; Step 3: adjusting the pH value of the mineral processing wastewater in the second reaction tank in step 1, and then adding a defoamer and a second flocculant to mix and stir; Step 4: adjusting the pH value of the mineral processing wastewater in the third reaction tank in step 1, and then adding a defoamer and a third flocculant to mix and stir; Step 5, stirring the reaction and then standing to settle; Step 6: After standing and settling, drain the supernatant into the clean water tank; Step 7: Add 120 mg / L sodium chlorate to the supernatant, stir the reaction and proceed to the next step; Step 8: After precipitation, test the sample. If the sample is qualified, proceed to the next step. If the sample is unqualified, continue to add sodium chlorate. Step 9: The pH value is neutral and qualified, then discharged; Step 10: After discharge, sample and test the wastewater.

[0036] In an embodiment of the present application, the first flocculant in step 2 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 9:1.

[0037] In an embodiment of the present application, the second flocculant in step three is prepared from raw materials including the following components: polyaluminium chloride and polyacrylamide, and the mass ratio of polyaluminium chloride to polyacrylamide is 9:1.

[0038] In an embodiment of the present application, the third flocculant in step 4 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 9:1.

[0039] In an embodiment of the present application, the pH value adjusted in step 2 is 6.5 to 8.5.

[0040] In an embodiment of the present application, the pH value adjusted in step three is 8.5-9.5.

[0041] In an embodiment of the present application, the pH value adjusted in step 4 is 6.5-8.5.

[0042] In an embodiment of the present application, the pH value is detected 5-7 times in step nine, a highest value and a lowest value are removed, and then the average value is taken.

[0043] In an embodiment of the present application, the sampling detection rate in step ten is 0.5-1L / M3.

[0044] Example 4 See also Figure 1The present invention provides a technical solution: a method for analyzing the treatment results of tungsten ore beneficiation wastewater, comprising the following steps: Step 1: Introduce the mineral processing wastewater into three different reaction tanks, and take samples and save them at the same time for later comparison; Step 2: adjusting the pH value of the mineral processing wastewater in the first reaction tank in step 1, and then adding a defoamer and a first flocculant to mix and stir; Step 3: adjusting the pH value of the mineral processing wastewater in the second reaction tank in step 1, and then adding a defoamer and a second flocculant to mix and stir; Step 4: adjusting the pH value of the mineral processing wastewater in the third reaction tank in step 1, and then adding a defoamer and a third flocculant to mix and stir; Step 5, stirring the reaction and then standing to settle; Step 6: After standing and settling, the supernatant is discharged into the clean water tank; Step 7: Add 120 mg / L sodium chlorate to the supernatant, stir and react, and then proceed to the next step; Step 8: After precipitation, test the sample. If the sample is qualified, proceed to the next step. If the sample is unqualified, continue to add sodium chlorate. Step 9: The pH value is neutral and qualified, then discharged; Step 10: After discharge, sample and test the wastewater.

[0045] In an embodiment of the present application, the first flocculant in step 2 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 11:1.

[0046] In an embodiment of the present application, the second flocculant in step three is prepared from raw materials including the following components: polyaluminium chloride and polyacrylamide, and the mass ratio of polyaluminium chloride to polyacrylamide is 11:1.

[0047] In an embodiment of the present application, the third flocculant in step 4 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 11:1.

[0048] In an embodiment of the present application, the pH value adjusted in step 2 is 6.5 to 8.5.

[0049] In an embodiment of the present application, the pH value adjusted in step three is 8.5-9.5.

[0050] In an embodiment of the present application, the pH value adjusted in step 4 is 6.5-8.5.

[0051] In an embodiment of the present application, the pH value is detected 5-7 times in step nine, a highest value and a lowest value are removed, and then the average value is taken.

[0052] In an embodiment of the present application, the sampling detection rate in step ten is 0.5-1L / M3.

[0053] Example 5 See also Figure 1 The present invention provides a technical solution: a method for analyzing the treatment results of tungsten ore beneficiation wastewater, comprising the following steps: Step 1: Introduce the mineral processing wastewater into three different reaction tanks, and take samples and save them at the same time for later comparison; Step 2: adjusting the pH value of the mineral processing wastewater in the first reaction tank in step 1, and then adding a defoamer and a first flocculant to mix and stir; Step 3: adjusting the pH value of the mineral processing wastewater in the second reaction tank in step 1, and then adding a defoamer and a second flocculant to mix and stir; Step 4: adjusting the pH value of the mineral processing wastewater in the third reaction tank in step 1, and then adding a defoamer and a third flocculant to mix and stir; Step 5, stirring the reaction and then standing to settle; Step 6: After standing and settling, the supernatant is discharged into the clean water tank; Step 7: Add 120 mg / L sodium chlorate to the supernatant, stir and react, and then proceed to the next step; Step 8: After precipitation, test the sample. If the sample is qualified, proceed to the next step. If the sample is unqualified, continue to add sodium chlorate. Step 9: The pH value is neutral and qualified, then discharged; Step 10: After discharge, sample and test the wastewater.

[0054] In an embodiment of the present application, the first flocculant in step 2 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 12:1.

[0055] In an embodiment of the present application, the second flocculant in step three is prepared from raw materials including the following components: polyaluminium chloride and polyacrylamide, and the mass ratio of polyaluminium chloride to polyacrylamide is 12:1.

[0056] In an embodiment of the present application, the third flocculant in step 4 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 12:1.

[0057] In an embodiment of the present application, the pH value adjusted in step 2 is 6.5 to 8.5.

[0058] In an embodiment of the present application, the pH value adjusted in step three is 8.5-9.5.

[0059] In an embodiment of the present application, the pH value adjusted in step 4 is 6.5-8.5.

[0060] In an embodiment of the present application, the pH value is detected 5-7 times in step nine, a highest value and a lowest value are removed, and then the average value is taken.

[0061] In an embodiment of the present application, the sampling detection rate in step ten is 0.5-1L / M3.

[0062] Example 6 See also Figure 1 The present invention provides a technical solution: a method for analyzing the treatment results of tungsten ore beneficiation wastewater, comprising the following steps: Step 1: Introduce the mineral processing wastewater into three different reaction tanks, and take samples and save them at the same time for later comparison; Step 2: adjusting the pH value of the mineral processing wastewater in the first reaction tank in step 1, and then adding a defoamer and a first flocculant to mix and stir; Step 3: adjusting the pH value of the mineral processing wastewater in the second reaction tank in step 1, and then adding a defoamer and a second flocculant to mix and stir; Step 4: adjusting the pH value of the mineral processing wastewater in the third reaction tank in step 1, and then adding a defoamer and a third flocculant to mix and stir; Step 5, stirring the reaction and then standing to settle; Step 6: After standing and settling, drain the supernatant into the clean water tank; Step 7: Add 120 mg / L sodium chlorate to the supernatant, stir the reaction and proceed to the next step; Step 8: After precipitation, test the sample. If the sample is qualified, proceed to the next step. If the sample is unqualified, continue to add sodium chlorate. Step 9: The pH value is neutral and qualified, then discharged; Step 10: After discharge, sample and test the wastewater.

[0063] In an embodiment of the present application, the first flocculant in step 2 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 16:1.

[0064] In an embodiment of the present application, the second flocculant in step three is prepared from raw materials including the following components: polyaluminium chloride and polyacrylamide, and the mass ratio of polyaluminium chloride to polyacrylamide is 16:1.

[0065] In an embodiment of the present application, the third flocculant in step 4 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 16:1.

[0066] In an embodiment of the present application, the pH value adjusted in step 2 is 6.5 to 8.5.

[0067] In an embodiment of the present application, the pH value adjusted in step three is 8.5-9.5.

[0068] In an embodiment of the present application, the pH value adjusted in step 4 is 6.5-8.5.

[0069] In an embodiment of the present application, the pH value is detected 5-7 times in step nine, a highest value and a lowest value are removed, and then the average value is taken.

[0070] In an embodiment of the present application, the sampling detection rate in step ten is 0.5-1L / M3.

[0071] Through measurement, the data of Examples 1-6 are made into the following table: Table 1:

[0072] By comparison, it can be seen that Example 1 has the best ratio and the best effect. Although Examples 2-6 also meet the sewage discharge standards, based on the treatment effect, the addition ratio of Example 1 is most suitable for promotion and use.

[0073] The invention has a scientific and reasonable structure, is safe and convenient to use, can further effectively reduce the COD of external drainage, ensure that various indicators meet the standards, make the wastewater treatment process more stable and reliable, and safeguard the continuous production of the ore dressing plant. At the same time, the cost of ore dressing wastewater treatment is significantly reduced, and other indicators such as suspended matter in the supernatant after treatment are also qualified, which is suitable for promotion and use. At the same time, by adjusting the pH value of ore dressing process wastewater and using flocculants for flocculation treatment, all treated wastewater can meet the reuse standard, thereby greatly improving the reuse rate of the device.

Claims

1. A method for analyzing the treatment results of tungsten ore beneficiation wastewater, characterized in that: The following steps are involved: Step 1: Introduce the mineral processing wastewater into three different reaction tanks, and take samples and save them at the same time for later comparison; Step 2: adjusting the pH value of the mineral processing wastewater in the first reaction tank in step 1, and then adding a defoamer and a first flocculant to mix and stir; Step 3: adjusting the pH value of the mineral processing wastewater in the second reaction tank in step 1, and then adding a defoamer and a second flocculant to mix and stir; Step 4: adjusting the pH value of the mineral processing wastewater in the third reaction tank in step 1, and then adding a defoamer and a third flocculant to mix and stir; Step 5, stirring the reaction and then standing to settle; Step 6: After standing and settling, drain the supernatant into the clean water tank; Step 7: Add 120 mg / L sodium chlorate to the supernatant, stir the reaction and proceed to the next step; Step 8: After precipitation, test the sample. If the sample is qualified, proceed to the next step. If the sample is unqualified, continue to add sodium chlorate. Step 9: The pH value is neutral and qualified, then discharged; Step 10: After discharge, sample and test the wastewater.

2. A method for analyzing tungsten ore dressing wastewater treatment results according to claim 1, characterized in that: The first flocculant in step 2 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 8-16:

1.

3. The method for analyzing the treatment results of tungsten ore dressing wastewater according to claim 1, characterized in that: In the step three, the second flocculant is prepared from raw materials including the following components: polyaluminium chloride and polyacrylamide, and the mass ratio of the polyaluminium chloride to the polyacrylamide is 8-16:

1.

4. The method for analyzing the treatment results of tungsten ore dressing wastewater according to claim 1, characterized in that: The third flocculant in step 4 is prepared from raw materials including the following components: polyferric sulfate and polyacrylamide, and the mass ratio of the polyferric sulfate to the polyacrylamide is 8-16:

1.

5. The method for analyzing the treatment results of tungsten ore dressing wastewater according to claim 1, characterized in that: The pH value adjusted in the step 2 is 6.5 to 8.

5.

6. The method for analyzing the treatment results of tungsten ore dressing wastewater according to claim 1, characterized in that: The pH value adjusted in step 3 is 8.5-9.

5.

7. The method for analyzing the treatment results of tungsten ore dressing wastewater according to claim 1, characterized in that: The pH value adjusted in the step 4 is 6.5 to 8.

5.

8. The method for analyzing the treatment results of tungsten ore dressing wastewater according to claim 1, characterized in that: In step nine, the pH value is detected 5-7 times, a highest value and a lowest value are removed, and then the average value is taken.

9. The method for analyzing the treatment results of tungsten ore dressing wastewater according to claim 1, characterized in that: The sampling detection rate in step ten is 0.5-1L / M3.

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