CN112573629A - Efficient compound coagulant for treating blast furnace gas washing wastewater and treatment method - Google Patents
Efficient compound coagulant for treating blast furnace gas washing wastewater and treatment method Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 62
- 238000005406 washing Methods 0.000 title claims abstract description 58
- 239000000701 coagulant Substances 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 26
- 150000001875 compounds Chemical class 0.000 title claims abstract description 15
- 238000003756 stirring Methods 0.000 claims abstract description 31
- 241000233866 Fungi Species 0.000 claims abstract description 22
- 239000008188 pellet Substances 0.000 claims description 13
- 241000228212 Aspergillus Species 0.000 claims description 12
- 239000006228 supernatant Substances 0.000 claims description 8
- 239000007864 aqueous solution Substances 0.000 claims description 7
- 238000012258 culturing Methods 0.000 claims description 7
- 239000001963 growth medium Substances 0.000 claims description 7
- 238000009630 liquid culture Methods 0.000 claims description 7
- 241000228143 Penicillium Species 0.000 claims description 5
- 239000010865 sewage Substances 0.000 claims description 5
- 241000894007 species Species 0.000 claims description 4
- 239000000443 aerosol Substances 0.000 claims description 3
- 239000010881 fly ash Substances 0.000 claims description 3
- 239000000779 smoke Substances 0.000 claims description 3
- 238000009628 steelmaking Methods 0.000 claims description 3
- 241000235395 Mucor Species 0.000 claims description 2
- 238000005273 aeration Methods 0.000 claims description 2
- 230000000415 inactivating effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract description 2
- 239000002699 waste material Substances 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 12
- 238000001514 detection method Methods 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- 230000003247 decreasing effect Effects 0.000 description 10
- 229910052742 iron Inorganic materials 0.000 description 10
- 239000007788 liquid Substances 0.000 description 6
- 238000004062 sedimentation Methods 0.000 description 6
- 239000000725 suspension Substances 0.000 description 5
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 4
- 230000001112 coagulating effect Effects 0.000 description 4
- JMANVNJQNLATNU-UHFFFAOYSA-N oxalonitrile Chemical compound N#CC#N JMANVNJQNLATNU-UHFFFAOYSA-N 0.000 description 4
- 235000002595 Solanum tuberosum Nutrition 0.000 description 3
- 244000061456 Solanum tuberosum Species 0.000 description 3
- 230000003321 amplification Effects 0.000 description 3
- 230000001580 bacterial effect Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 238000000855 fermentation Methods 0.000 description 3
- 230000004151 fermentation Effects 0.000 description 3
- 239000010842 industrial wastewater Substances 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002779 inactivation Effects 0.000 description 1
- -1 iron ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/347—Use of yeasts or fungi
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Microbiology (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Mycology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses an efficient compound coagulant for treating blast furnace gas washing wastewater and a treatment method thereof, wherein the coagulant comprises PFS and PAM, the proportion of PFS to PAM is 4-8: 1; the treatment method comprises the following steps: adjusting the pH value of blast furnace gas washing wastewater to be between 5 and 9, adding the coagulant, wherein the adding amount of PFS is 15 to 25mg/L, the adding amount of PAM is 3 to 6ml/L, rapidly stirring for 40 to 70s at the speed of 300r/min and 55 to 65r/min, then stirring for 8 to 12min at the low speed, and then standing for 5 to 30 min. According to the invention, by changing the compounding proportion and the adding amount of the compound coagulant and combining the magnetic seeds loaded with filamentous fungi, the removal effects of SS and turbidity of blast furnace gas washing wastewater are respectively as high as 98.59% and 99.41%, and the treatment effect of suspended matters is reduced to 14mg/L, which is far higher than the treatment capacity of 50mg/L in the prior art; the coagulant has low PFS and PAM adding amount, the filamentous fungi used in the treatment also have the characteristics of low cost and easy preparation, and the selected magnetic seeds can be recycled and belong to waste utilization, so the cost is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to an efficient compound coagulant for treating blast furnace gas washing wastewater and a treatment method.
Background
The production operation of metallurgical iron and steel enterprises needs a large amount of water and discharges a large amount of sewage, and nowadays, the environmental protection is increasingly regarded as important, and the responsibility of iron and steel enterprises is to improve the industrial wastewater treatment technology and reduce the wastewater discharge. The industrial wastewater generated by the iron and steel enterprises comprises coking wastewater, beneficiation wastewater, steel rolling wastewater, converter wastewater, blast furnace gas washing wastewater and the like. Wherein, the blast furnace gas washing water contains inorganic suspended matters with higher concentration and organic matters with lower concentration, and is inorganic suspended matter industrial wastewater. The blast furnace gas washing water has high pollutant content and great water amount, and if the blast furnace gas washing water is directly discharged, the blast furnace gas washing water pollutes the environment and wastes water resources. In consideration of pollution reduction and water resource saving, the best idea for solving the problem is to recycle the blast furnace gas washing wastewater after treatment and realize the sewage recycling.
The impurities contained in the blast furnace gas washing wastewater comprise coke powder, dust mud, solid suspended matters, oxides, inorganic salts and the like, and some toxic substances such as cyanogen, phenol, heavy metals and the like exist, so that the direct discharge can cause great pollution.
The natural settling method is used to treat the waste water from blast furnace gas washing, and the washing water is made to enter settling tank or concentrating tank by means of gravity and then cooled in cooling tower for reuse, and the said method has circulation rate up to 96% and effluent SS less than 90 mg/L. To a certain extent, although the natural sedimentation method does not need to add medicines and almost does not consume energy, the sedimentation tank gradually gets out of the visual field of people due to the defects of overlarge area, overlong HRT and the like.
At present, in China, the blast furnace gas washing wastewater of large-scale steel plants is treated by a coagulating sedimentation method. The coagulating sedimentation method has high removal rate of suspended matters and good effect on removing other pollutants (such as phenol, cyanogen and heavy metals).
At present, the mainstream treatment technology for blast furnace gas washing wastewater abroad is also a coagulating sedimentation method. The treatment process adopted by certain Japanese large-scale steel works is as follows: removing large particle impurities by a coarse particle separator, adding sodium hydroxide to increase the pH value, and injecting a high molecular coagulant into a coagulation precipitation tank to precipitate Fe (OH)2 and Zn (OH)2 generated by iron ions and zinc ions. The suspended matter content SS of the waste water after the coagulating sedimentation treatment is less than 30mg/L, and the waste water is cooled by a cooling tower and then recycled.
Although the treatment technology of the blast furnace gas washing wastewater in China is advanced at present, the problems of long precipitation time, high medicament cost and the like still exist.
Therefore, it is necessary to develop a coagulant and a treatment method which have better coagulation effect, are quicker and have lower cost.
Disclosure of Invention
The invention aims to provide an efficient compound coagulant for treating blast furnace gas washing wastewater, and the invention aims to provide a method for treating the blast furnace gas washing wastewater.
The first purpose of the invention is realized by that the high-efficiency compound coagulant for treating blast furnace gas washing wastewater comprises PFS and PAM, the proportion of PFS to PAM is 4-8: 1.
the second purpose of the invention is realized by the following specific method for treating the blast furnace gas washing wastewater: adjusting the pH value of blast furnace gas washing wastewater to be between 5 and 9, adding the coagulant, wherein the adding amount of PFS is 15 to 25mg/L, the adding amount of PAM is 3 to 6ml/L, rapidly stirring for 40 to 70s at the speed of 300r/min and 55 to 65r/min, then stirring for 8 to 12min at the low speed, and then standing for 5 to 30 min.
The invention has the beneficial effects that: the invention provides a method for efficiently treating blast furnace gas washing wastewater, which realizes the removal effects of SS and turbidity respectively reaching 98.59 percent and 99.41 percent by changing the compounding proportion and the adding amount of a compounded coagulant and combining with magnetic seeds loaded with filamentous fungi, and the treatment effect that suspended matters are reduced to 14mg/L is far higher than the treatment capacity of 50mg/L in the prior art; the addition amount of PFS of the coagulant is only 15-25mg/L, the addition amount of PAM is only 3-6ml/L, and filamentous fungi used in the treatment also have the characteristics of low cost and easy preparation. The settling time of suspended matters is reduced to 10min, and the treatment efficiency is greatly improved.
Detailed Description
The present invention is further illustrated by the following examples, which are not intended to be limiting in any way, and any modifications or alterations based on the teachings of the present invention are intended to fall within the scope of the present invention.
The invention relates to an efficient compound coagulant for treating blast furnace gas washing wastewater, which comprises PFS and PAM, wherein the proportion of PFS to PAM is 4-8: 1.
the PAM is 0.1% PAM aqueous solution.
The invention relates to a treatment method of blast furnace gas washing wastewater, which comprises the following specific steps: adjusting the pH value of blast furnace gas washing wastewater to be between 5 and 9, adding the coagulant, wherein the adding amount of PFS is 15 to 25mg/L, the adding amount of PAM is 3 to 6ml/L, rapidly stirring for 40 to 70s at the speed of 300r/min and 55 to 65r/min, then stirring for 8 to 12min at the low speed, and then standing for 5 to 30 min.
The pH was 8.
Adding magnetic seeds loaded with dead or living filamentous fungi while adding the coagulant.
Adding magnetic seeds loaded with dead or living filamentous fungi after coagulant treatment, stirring for 3-5min, and standing for 5-10 min.
The filamentous fungi are penicillium or aspergillus or mucor.
The preparation method of the magnetic seeds of the filamentous fungi living body comprises the following steps: culturing dead fungus strain in liquid culture medium to form mycelium pellet of 1-3mm, culturing in liquid culture medium to obtain mass mycelium pellets, and adding magnetic seed and stirring; the dead filamentous fungus body is obtained by inactivating magnetic species of the living filamentous fungus body.
The dosage of the magnetic seeds of the dead filamentous fungi is 70-100 ml/L.
The magnetic seeds are any one or a composition of smoke dust, aerosol condensate or fly ash discharged in the steelmaking process.
The stirring speed of the magnetic seeds loaded with the dead filamentous fungi is 150-200r/min.
Heating the wastewater in the treatment process; the supernatant after standing is passed through an aeration tank to discharge CO in the sewage2。
Example 1
An efficient compound coagulant for treating blast furnace gas washing wastewater comprises 8 parts of PFS and 1 part of 0.1% PAM aqueous solution.
Example 2
An efficient compound coagulant for treating blast furnace gas washing wastewater comprises 4 parts of PFS and 1 part of 0.1% PAM aqueous solution.
Example 3
An efficient compound coagulant for treating blast furnace gas washing wastewater comprises 5 parts of PFS and 1 part of 0.1% PAM aqueous solution.
Example 4
An efficient compound coagulant for treating blast furnace gas washing wastewater comprises 6 parts of PFS and 1 part of 0.1% PAM aqueous solution.
Example 5
An efficient compound coagulant for treating blast furnace gas washing wastewater comprises 7 parts of PFS and 1 part of 0.1% PAM aqueous solution.
Example 6
In the present example, blast furnace gas washing wastewater from kunming iron and steel control limited company is used as an experimental object, and the water quality conditions are shown in table 1:
TABLE 1 blast furnace gas washing wastewater quality
| Index (I) | SS(mg/L) | Turbidity (NTU) | pH | Temperature (. degree.C.) |
| Concentration of raw water | 1280 | 315 | 7 | 65 |
Preparing a coagulant, wherein the addition amount of PFS is 20 mg/L, and the addition amount of PAM is 4 ml/L; regulating the pH value of blast furnace gas washing wastewater to 8, slowly adding a coagulant in a multipoint mode, stirring for 60s at 300r/min, then stirring for 10min at a low speed of 60r/min, and then standing for 30 min.
Taking the supernatant for water quality detection, wherein the detection result is as follows: the turbidity decreased from 315NTU to 1.87NTU and the suspended matter decreased from 1280mg/L to 18 mg/L.
Example 7
In the present embodiment, blast furnace gas washing wastewater from kunming iron and steel control limited company is used as an experimental object, and the water quality conditions are shown in table 2:
TABLE 2 blast furnace gas washing wastewater quality
| Index (I) | SS(mg/L) | Turbidity (NTU) | pH | Temperature (. degree.C.) |
| Concentration of raw water | 1358 | 327 | 9 | 75 |
Preparing a coagulant, wherein the adding amount of PFS is 23mg/L, and the adding amount of PAM is 6 ml/L; regulating the pH value of blast furnace gas washing wastewater to 8, slowly adding a coagulant in a multi-point mode, stirring for 50s at 250r/min, then stirring for 12min at a low speed of 65r/min, and then standing for 10 min.
Taking the supernatant for water quality detection, wherein the detection result is as follows: the turbidity decreased from 327NTU to 1.97NTU and the suspension decreased from 1358mg/L to 19 mg/L.
Example 8
In the present embodiment, blast furnace gas washing wastewater from kunming iron and steel control limited company is used as an experimental object, and the water quality conditions are shown in table 3:
TABLE 3 blast furnace gas washing wastewater quality
| Index (I) | SS(mg/L) | Turbidity (NTU) | pH | Temperature (. degree.C.) |
| Concentration of raw water | 1410 | 332 | 8 | 50 |
Preparing a coagulant, wherein the adding amount of PFS is 24mg/L, and the adding amount of PAM is 6 ml/L; slowly adding coagulant in a multi-point mode, stirring for 70s at 280r/min, then stirring for 8min at low speed of 55r/min, and then standing for 15 min.
Taking the supernatant for water quality detection, wherein the detection result is as follows: turbidity was reduced from 332NTU to 2.01NTU and suspension was reduced from 1410mg/L to 21 mg/L.
Example 9
In the present example, blast furnace gas washing wastewater from kunming iron and steel control limited company is used as an experimental object, and the water quality conditions are shown in table 1:
preparing a coagulant, wherein the addition amount of PFS is 15mg/L, and the addition amount of PAM is 4 ml/L;
preparing magnetic seeds loaded with dead aspergillus bodies: 1) inoculating aspergillus species into a 1L potato liquid culture medium, culturing for 2 days at 32 ℃ to form loose mycelium pellets, wherein the diameter of the pellets is 1-3mm, inoculating the bacterial liquid into a 30L liquid fermentation tank, performing amplification culture for 2 days to form a large amount of-3 small mycelium pellets, adding magnetic seeds, stirring at 500r/min for 300-; the amount of the magnetic seed carrying dead Aspergillus was 100 ml/L.
The magnetic seeds are any one or a composition of smoke dust, aerosol condensate or fly ash discharged in the steelmaking process.
Adding sodium hydroxide to adjust the pH value of blast furnace gas washing wastewater to 8, slowly adding a coagulant in a multi-point mode, stirring for 60s at 300r/min, then stirring at a low speed of 60r/min for 10min, then standing for 5min, finally adding magnetic seeds loaded with dead aspergillus, stirring for 3min at 15r/min, and standing for 5 min.
Taking the supernatant for water quality detection, wherein the detection result is as follows: the turbidity decreased from 315NTU to 1.84NTU and the suspension decreased from 1280mg/L to 15 mg/L.
Example 9
In the present example, blast furnace gas washing wastewater from kunming iron and steel control limited company is used as an experimental object, and the water quality conditions are shown in table 1:
preparing a coagulant, wherein the addition amount of PFS is 15mg/L, and the addition amount of PAM is 3 ml/L;
preparing magnetic seeds loaded with penicillium: 1) inoculating aspergillus species into a 1L potato liquid culture medium, culturing for 2.5 days at 30 ℃ to form loose mycelium pellets, wherein the diameter of the pellets is 1-3mm, inoculating a bacterial liquid into a 30L liquid fermentation tank, performing amplification culture for 2.5 days to form a large number of mycelium pellets, adding magnetic seeds, stirring for 4 hours at 400r/min, and adding isopropanol to inactivate to obtain magnetic seeds loaded with filamentous fungi; the dosage of the magnetic seeds loaded with the penicillium is 90 ml/L.
Adding sodium hydroxide to adjust the pH value of blast furnace gas washing wastewater to 8, slowly adding a coagulant in a multi-point mode, stirring for 60s at 300r/ml in, then stirring for 10min at a low speed of 60r/min, then standing for 5min, finally adding a magnetic seed loaded with penicillium dead bodies, stirring for 3min at 150r/min, and then standing for 5 min.
Taking the supernatant for water quality detection, wherein the detection result is as follows: the turbidity decreased from 315NTU to 1.84NTU and the suspension decreased from 1280mg/L to 15 mg/L.
Example 10
In the present embodiment, blast furnace gas washing wastewater from kunming iron and steel control limited company is used as an experimental object, and the water quality conditions are shown in table 2:
preparing a coagulant, wherein the addition amount of PFS is 18mg/L, and the addition amount of PAM is 4 ml/L;
preparing magnetic seeds loaded with dead aspergillus bodies: 1) inoculating aspergillus strains into a 1L potato liquid culture medium, culturing for 2 days at 32 ℃ to form loose mycelium pellets, wherein the diameter of the pellets is 1-3mm, inoculating the bacterial liquid into a 30L liquid fermentation tank, performing amplification culture for 2 days to form a large number of mycelium pellets, adding magnetic seeds, stirring for 6 hours at 300r/min, and adding isopropanol for inactivation to obtain magnetic seeds loaded with aspergillus dead bodies; the amount of the magnetic seed carrying dead Aspergillus was 100 ml/L.
Adding sodium hydroxide to adjust the pH value of the blast furnace gas washing wastewater to 8, slowly adding a coagulant and magnetic seeds loaded with aspergillus in a multi-point mode, stirring for 50s at 250r/min, then stirring for 7min at a low speed of 65r/min, and then standing for 10 min.
Taking the supernatant for water quality detection, wherein the detection result is as follows: the turbidity decreased from 315NTU to 1.81NTU and the suspension decreased from 1280mg/L to 14 mg/L.
Claims (10)
1. The efficient compound coagulant for treating blast furnace gas washing wastewater is characterized by comprising PFS and PAM, wherein the proportion of PFS to PAM is 4-8: 1.
2. the efficient compound coagulant for treating blast furnace gas washing wastewater according to claim 1, wherein the PAM is a 0.1% PAM aqueous solution.
3. The method for treating the blast furnace gas washing wastewater is characterized by adjusting the pH value of the blast furnace gas washing wastewater to be between 5 and 9, adding the coagulant, adding the PFS in an amount of 15 to 25mg/L and the PAM in an amount of 3 to 6ml/L, quickly stirring for 40 to 70 seconds at a speed of 250-300r/min, then stirring for 8 to 12 minutes at a low speed of 55 to 65r/min, and then standing for 5 to 30 minutes.
4. The method for treating blast furnace gas washing wastewater according to claim 3, characterized in that magnetic seeds loaded with living or dead filamentous fungi are added while coagulant is added.
5. The method for treating blast furnace gas washing wastewater according to claim 3, characterized in that after coagulant treatment, magnetic seeds loaded with filamentous fungi living or dead bodies are added for stirring treatment for 3-5min, and then left stand for 5-10 min.
6. The method for treating blast furnace gas washing wastewater according to claim 4 or 5, wherein the filamentous fungus is Penicillium, Aspergillus, or Mucor.
7. The method for treating blast furnace gas washing wastewater according to claim 6, wherein the magnetic species of the filamentous fungi living body is prepared by: culturing dead fungus strain in liquid culture medium to form mycelium pellet of 1-3mm, culturing in liquid culture medium to obtain mass mycelium pellets, and adding magnetic seed and stirring; the dead filamentous fungus body is obtained by inactivating magnetic species of the living filamentous fungus body.
8. The method for treating blast furnace gas washing wastewater according to claim 3, wherein the magnetic species is any one or a combination of smoke, aerosol condensate or fly ash discharged in a steel-making process.
9. The method for treating blast furnace gas washing wastewater as defined in claim 3, wherein the stirring speed of the magnetic seeds loaded with the dead filamentous fungi is 150-200r/min.
10. The method for treating blast furnace gas washing wastewater according to claim 3, wherein the blast furnace gas washing wastewater is treated in the treatment processHeating the wastewater; the supernatant after standing is passed through an aeration tank to discharge CO in the sewage2。
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| CN114054003A (en) * | 2021-07-26 | 2022-02-18 | 苏州贝彩纳米科技有限公司 | Micro-nano modified magnetic powder |
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