CN106746019A - A kind of industrial silicon p owder production sewage technique - Google Patents
A kind of industrial silicon p owder production sewage technique Download PDFInfo
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- CN106746019A CN106746019A CN201710027430.6A CN201710027430A CN106746019A CN 106746019 A CN106746019 A CN 106746019A CN 201710027430 A CN201710027430 A CN 201710027430A CN 106746019 A CN106746019 A CN 106746019A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/02—Silicon
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- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- 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
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- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- 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
- C02F2001/007—Processes including a sedimentation step
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Chemical & Material Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The present invention discloses a kind of industrial silicon p owder production sewage technique, comprises the following steps：1) cooling water homogenizes regulation；2) cooling water is neutralized；3) cooling water mixed flocculation；4) go out water filtration and floccule body is reclaimed；5) water outlet is recycled；It is contained in the waste water that the industrial silicon p owder production sewage technique can be produced according to production silica flour to be processed containing silica flour, carborundum, polyethylene glycol, hydrofluoric acid, citric acid, treatment effeciency can be improved, reduce the pollution to environment, the silica flour in the water body and cooling water handled well can be recycled simultaneously, be conducive to cost-effective.
Description
Technical field
The present invention relates to a kind of industrial silicon p owder production sewage technique.
Background technology
Silica flour is manufacture integrated circuit, the key foundation material of photovoltaic solar, is that national information industry and new energy are produced
The important foundation stone of industry development.But the industrial wastewater of substantial amounts of complicated component is produced in silica flour industry production process, it is big at present
It is take collection respectively, the method for classification treatment more.Wherein in crushing grinding waste water, cleaning waste water and punching rotation flour mill cooling water
Containing substantial amounts of wire cutting liquid, carborundum and silica flour etc., silicon powder particle is very tiny, or even more than static half a year also only lacks portion
Bulky grain is divided to be deposited on bottom, most of fine particle is still suspended in waste water, waste water is constantly in cloudy state, and silicon
Powder hardness is bigger, very big abrasion can be produced to follow-up processing equipment, have a strong impact on stable operation and the service life of equipment.
This kind of Wastewater Pollutant typical case, COD contents are higher and difficult degradation, and silicon powder particle is trickle to be difficult to precipitate, and intractability is larger.
At present, the effective processing method of domestic contrast is physico-chemical precipitation/hydrolysis acidification/Aerobic Process for Treatment, and physico-chemical precipitation can
By the removal of the fine suspension such as silica flour matter, it is easy that the macromolecular hard-degraded substance in wire cutting liquid is converted into small molecule by hydrolysis acidification
The material of degraded, is that follow-up Aerobic Process for Treatment is prepared so as to improve the biodegradability of waste water.In aerobic treatment process unit, lead to
The degraded for crossing microorganism completes the removal of COD.Two methods of ordinary activated sludge and membrane bioreactor in Aerobic treatment method
Use.But traditional aerobic aeration pond sludge concentration is relatively low, and the removal ability to COD is limited, and especially temperature is relatively low
When, water outlet COD even can reach 500mg/L.During using membrane bioreactor degraded COD, although membrane bioreactor
Have the advantages that sludge concentration is high and outlet effect is good, can effectively remove COD in waste water, but if preceding segment unit can not be by
The fine particles such as silica flour are effectively removed, and cause the silica flour particulate of the Severe blockage of membrane module, high rigidity to will also result in sternly face
Damage again, and then influence stable operation and the service life of membrane module.
Furthermore, at present in the production process of high purity metal silica flour, often suppress dust extraction outlet using running water injection
Need to open deduster water valve with environment purification, before production, using spray atomizing running water, at source outlet carrying out sprinkling blocks
Cut, and droplet size is adjusted by the independent assortment of nozzle, the fine dusts in air is fallen with droplet, reach optimization ring
The purpose in border.But the method for this dedusting expends substantial amounts of water resource and silica flour, it is unfavorable for improving the production development of enterprise.
Therefore, in sum, the sewage treatment process in existing industrial silicon p owder production cannot be produced according to production silica flour
It is contained in raw waste water to be processed containing silica flour, carborundum, polyethylene glycol, hydrofluoric acid, citric acid, its treatment effeciency
Low, environmental pollution is serious, and water resource and silica flour waste serious, cause the problem that production cost is high.
The content of the invention
The technical problem to be solved in the present invention be to provide it is a kind of can according to production silica flour produce waste water in it is contained
Processed containing silica flour, carborundum, polyethylene glycol, hydrofluoric acid, citric acid, it is possible to increase treatment effeciency, reduced to environment
Pollution, while the silica flour in the water body and cooling water handled well can be recycled, is conducive to cost-effective industrial silicon system
Powder production waste technique.
To solve the above problems, the present invention is adopted the following technical scheme that：
A kind of industrial silicon p owder production sewage technique, comprises the following steps：
1) waste water homogenizes regulation, concretely comprises the following steps：A, by the cooling water after used in silico briquette disintegrating machine production process with
And the cooling water in punching rotation flour mill pulverizing process after use is flowed in regulating reservoir so that cooling water stands heavy in regulating reservoir
Form sediment so that silica flour precipitation is separated with cooling water；After silica flour is separated with cooling water in B, specific steps A, derived by by cooling water,
And water conservancy diversion is collected to the silica flour in neutralization pond, being deposited in regulating reservoir bottom, and dried by drying machine and grinder is ground
Mill, the silica flour for obtaining is recycled；
2) cooling water is neutralized, and is concretely comprised the following steps：A, preparing lime milk liquid, take calcium hydroxide 10-16 parts and water purification 50-80 parts
Together it is put into milk of lime tank diameter, calcium hydroxide and water purification is mixed by mixer 12.5-32% concentration is obtained
Lime slurry；B, obtained lime slurry in specific steps A is added in neutralization pond so that the cooling of lime slurry and acidity
Water mixes, reaction 1-3 hours of going forward side by side so that the water outlet PH of neutralization pond reaches 6-8, while by water outlet water conservancy diversion to mixing pit；
3) cooling water mixed flocculation, concretely comprises the following steps：A, preparation flocculant, take aluminium polychloride 4-6 parts and water purification 80-
120 parts are stirred mixing by mixer, and it is the PAC solution of 3.33-7.5% that concentration is obtained, and takes polyacrylamide 1-3 parts and water purification
200-600 parts of mixing, it is the PAM solution of 0.17-1.5% that concentration is obtained；B, added by every cubic metre of water outlet in mixing pit
PAC solution 6-10L obtained in specific steps A, PAM solution 2-4L, at the same start mixer continuously run so that PAC solution and
PAM solution can be well mixed with water outlet, and prevent precipitation and gum deposit；C, by integrated form sewage purification device by inertia and
Turbulent shear force water outlet can quickly form the larger floccule body such as alumen ustum in the presence of PAC solution and PAM solution, then will be mixed
There is the water outlet water conservancy diversion of floccule body in filtering ponds；
4) go out water filtration and floccule body is reclaimed：Press filtration is carried out to the water outlet in filtering ponds by plate-frame filtering forcing press,
So that the floccule body in water outlet stops filtering, and water outlet is imported in stabilization pond, while floccule body precipitates to form sludge, then will
Sludge takes out and desiccation；
5) effluent recycling in stabilization pond is continued with as industrial water.
Beneficial effects of the present invention are：The a large amount of silicon taken away by industrial silicon p owder production sewage technique recoverable wastewater
Powder so that in sewage disposal can recovery section material, be used to improve productive profit, reduce the waste of resource, furthermore, to useless
Water carries out cooling water and homogenizes regulation successively, and cooling water is neutralized, and cooling water mixed flocculation and goes out water filtration and floccule body is reclaimed, most
The backflow after treatment is reused as industrial water afterwards, advantageously reduces production cost.
Specific embodiment
Embodiment 1
A kind of industrial silicon p owder production sewage technique, comprises the following steps：
1) waste water homogenizes regulation, concretely comprises the following steps：A, by the cooling water after used in silico briquette disintegrating machine production process with
And the cooling water in punching rotation flour mill pulverizing process after use is flowed in regulating reservoir so that cooling water stands heavy in regulating reservoir
Form sediment so that silica flour precipitation is separated with cooling water；After silica flour is separated with cooling water in B, specific steps A, derived by by cooling water,
And water conservancy diversion is collected to the silica flour in neutralization pond, being deposited in regulating reservoir bottom, and dried by drying machine and grinder is ground
Mill, the silica flour for obtaining is recycled；
2) cooling water is neutralized, and is concretely comprised the following steps：A, preparing lime milk liquid, take 16 parts of calcium hydroxide and 50 parts of water purification is together put
Enter in milk of lime tank diameter, calcium hydroxide and water purification are mixed by the lime slurry that 32% concentration is obtained by mixer；B、
Obtained lime slurry in specific steps A is added in neutralization pond so that lime slurry mixes with the cooling water of acidity, goes forward side by side
Reaction 1 hour so that the water outlet PH of neutralization pond reaches 6, while by water outlet water conservancy diversion to mixing pit；
3) cooling water mixed flocculation, concretely comprises the following steps：A, preparation flocculant, take 6 parts of aluminium polychloride and 80 parts of water purification leads to
Mixer stirring mixing is crossed, prepared concentration is 7.5% PAC solution, takes the 200 parts of mixings of 3 parts of polyacrylamide and water purification,
Prepared concentration is 1.5% PAM solution；B, the PAC solution as obtained in every cubic metre of water outlet addition specific steps A in mixing pit
6L, PAM solution 2L, while start mixer continuously running so that PAC solution and PAM solution can be well mixed with water outlet, and
Prevent precipitation and gum deposit；C, by integrated form sewage purification device by inertia and turbulent shear force water outlet in PAC solution and PAM
The larger floccule body such as alumen ustum can be quickly formed in the presence of solution, the water outlet water conservancy diversion of floccule body to filtering ponds then will be mixed with
It is interior；
4) go out water filtration and floccule body is reclaimed：Press filtration is carried out to the water outlet in filtering ponds by plate-frame filtering forcing press,
So that the floccule body in water outlet stops filtering, and water outlet is imported in stabilization pond, while floccule body precipitates to form sludge, then will
Sludge takes out and desiccation；
5) effluent recycling in stabilization pond is continued with as industrial water.
Step 3) in PAC solution and PAM solution be all flocculant for processing the suspension in sewage.
Step 4) in sludge be transported to after the drying in cement tower and mix with finished ground cement, prepared blended cement powder.
Embodiment 2
A kind of industrial silicon p owder production sewage technique, comprises the following steps：
1) waste water homogenizes regulation, concretely comprises the following steps：A, by the cooling water after used in silico briquette disintegrating machine production process with
And the cooling water in punching rotation flour mill pulverizing process after use is flowed in regulating reservoir so that cooling water stands heavy in regulating reservoir
Form sediment so that silica flour precipitation is separated with cooling water；After silica flour is separated with cooling water in B, specific steps A, derived by by cooling water,
And water conservancy diversion is collected to the silica flour in neutralization pond, being deposited in regulating reservoir bottom, and dried by drying machine and grinder is ground
Mill, the silica flour for obtaining is recycled；
2) cooling water is neutralized, and is concretely comprised the following steps：A, preparing lime milk liquid, take 10 parts of calcium hydroxide and 80 parts of water purification is together put
Enter in milk of lime tank diameter, calcium hydroxide and water purification are mixed by the lime slurry that 12.5% concentration is obtained by mixer；
B, obtained lime slurry in specific steps A is added in neutralization pond so that lime slurry mixes with the cooling water of acidity, and
Enter reaction 3 hours so that the water outlet PH of neutralization pond reaches 8, while by water outlet water conservancy diversion to mixing pit；
3) cooling water mixed flocculation, concretely comprises the following steps：A, preparation flocculant, take 4 parts of aluminium polychloride and 120 parts of water purification leads to
Mixer stirring mixing is crossed, prepared concentration is 3.33% PAC solution, take 1 part of polyacrylamide and 600 parts of mixing of water purification are stirred
Mix, prepared concentration is 0.17% PAM solution；B, the PAC as obtained in every cubic metre of water outlet addition specific steps A in mixing pit are molten
Liquid 10L, PAM solution 4L, while start mixer continuously running so that PAC solution and PAM solution can mix with water outlet
It is even, and prevent precipitation and gum deposit；C, by integrated form sewage purification device by inertia and turbulent shear force water outlet in PAC solution
With the larger floccule body such as alumen ustum can be quickly formed in the presence of PAM solution, the water outlet water conservancy diversion that then will be mixed with floccule body was arrived
In filter tank；
4) go out water filtration and floccule body is reclaimed：Press filtration is carried out to the water outlet in filtering ponds by plate-frame filtering forcing press,
So that the floccule body in water outlet stops filtering, and water outlet is imported in stabilization pond, while floccule body precipitates to form sludge, then will
Sludge takes out and desiccation；
5) effluent recycling in stabilization pond is continued with as industrial water.
Step 3) in PAC solution and PAM solution be all flocculant for processing the suspension in sewage.
Step 4) in sludge be transported to after the drying in cement tower and mix with finished ground cement, prepared blended cement powder.
Embodiment 3
A kind of industrial silicon p owder production sewage technique, comprises the following steps：
1) waste water homogenizes regulation, concretely comprises the following steps：A, by the cooling water after used in silico briquette disintegrating machine production process with
And the cooling water in punching rotation flour mill pulverizing process after use is flowed in regulating reservoir so that cooling water stands heavy in regulating reservoir
Form sediment so that silica flour precipitation is separated with cooling water；After silica flour is separated with cooling water in B, specific steps A, derived by by cooling water,
And water conservancy diversion is collected to the silica flour in neutralization pond, being deposited in regulating reservoir bottom, and dried by drying machine and grinder is ground
Mill, the silica flour for obtaining is recycled；
2) cooling water is neutralized, and is concretely comprised the following steps：A, preparing lime milk liquid, take 13 parts of calcium hydroxide and 65 parts of water purification is together put
Enter in milk of lime tank diameter, calcium hydroxide and water purification are mixed by the lime slurry that 20% concentration is obtained by mixer；B、
Obtained lime slurry in specific steps A is added in neutralization pond so that lime slurry mixes with the cooling water of acidity, goes forward side by side
Reaction 2 hours so that the water outlet PH of neutralization pond reaches 7, while by water outlet water conservancy diversion to mixing pit；
3) cooling water mixed flocculation, concretely comprises the following steps：A, preparation flocculant, take 5 parts of aluminium polychloride and 100 parts of water purification leads to
Mixer stirring mixing is crossed, prepared concentration is 5% PAC solution, take the 400 parts of mixings of 2 parts of polyacrylamide and water purification, system
Obtain the PAM solution that concentration is 0.5%；B, the PAC solution 8L as obtained in every cubic metre of water outlet addition specific steps A in mixing pit,
PAM solution 3L, while start mixer continuously running so that PAC solution and PAM solution can be well mixed with water outlet, and prevent
Only precipitate and gum deposit；It is C, molten in PAC solution and PAM by inertia and turbulent shear force water outlet by integrated form sewage purification device
The larger floccule body such as alumen ustum can be quickly formed in the presence of liquid, the water outlet water conservancy diversion of floccule body then will be mixed with filtering ponds；
4) go out water filtration and floccule body is reclaimed：Press filtration is carried out to the water outlet in filtering ponds by plate-frame filtering forcing press,
So that the floccule body in water outlet stops filtering, and water outlet is imported in stabilization pond, while floccule body precipitates to form sludge, then will
Sludge takes out and desiccation；
5) effluent recycling in stabilization pond is continued with as industrial water.
Step 3) in PAC solution and PAM solution be all flocculant for processing the suspension in sewage.
Step 4) in sludge be transported to after the drying in cement tower and mix with finished ground cement, prepared blended cement powder.
Experimental example
There is substantial amounts of silica flour, carborundum, polyethylene glycol, hydrofluoric acid and citric acid in the waste water produced due to silica flour,
Sewage after untreated is discharged, and is not only resulted in silica flour and is largely lost in, and can also cause sewage by soil and throttling
Polluted.
By taking the waste water that silico briquette disintegrating machine is produced as an example, processed using the carrying out of this technique, it is as shown in table 1 below, after treatment
Water body be sampled detection, and record the water quality data of sewage after treatment：
As shown above, it is resulting under milk of lime liquation, PAC solution and the PAM solution conditions for adding different equal portions
Effect is different.
In sum, this technique is in the case where the milk of lime liquation of different equal portions, PAC solution and PAM solution conditions are added, and it is dirty
Water treatment efficiency is also different, but generally speaking, the efficiency that sewage treatment and recovery is utilized is improved.
Typical case
Certain silica flour manufacturing enterprise, produces 36 tons of silica flours daily, but the sewage only produced by disintegrating machine reaches 6 tons daily, but greatly
The sewage of amount is directly discharged can cause the pollution of environment, therefore, what this silica flour manufacturing enterprise of family had built a set of sewage disposal is
System, but technological process of this set sewage disposal system in running is not clear and definite enough, and the silica flour in sewage is recycled without meal, is led
Cause composition removal in sewage not enough thoroughly, cause the sewage after treatment both not reach discharge standard, more do not reach recycling
Standard, while the cost of the sewage disposal system be medicament expense use 5 yuan/t, the electricity charge be 0.5 yuan/t, labour cost be 3 yuan/t, conjunction
Meter running cost is about 2.8 yuan/t, and the silica flour manufacturing enterprise combines the yield of sewage, carries out this technological process, and according to this technique
Sewage disposal system is improved, makes sewage disposal thoroughly, the silica flour in sewage can be recycled, and the sewage after treatment both reached
Discharge standard, while the standard of recycling is also reached, while the cost of the sewage disposal system is 1 yuan/t of medicament expense, electricity
It is 0.5 yuan/t to take, and labour cost is 1.5 yuan/t, and total running cost is about 1 yuan/t, while treatment sewage is up to standard, is also effectively dropped
Low cost.
Beneficial effects of the present invention are：The a large amount of silicon taken away by industrial silicon p owder production sewage technique recoverable wastewater
Powder so that in sewage disposal can recovery section material, be used to improve productive profit, reduce the waste of resource, furthermore, to useless
Water carries out cooling water and homogenizes regulation successively, and cooling water is neutralized, and cooling water mixed flocculation and goes out water filtration and floccule body is reclaimed, most
The backflow after treatment is reused as industrial water afterwards, advantageously reduces production cost.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
The change or replacement expected without creative work, should all be included within the scope of the present invention.
Claims (1)
1. a kind of industrial silicon p owder production sewage technique, it is characterised in that：Comprise the following steps：
1) waste water homogenizes regulation, concretely comprises the following steps：A, by the cooling water after used in silico briquette disintegrating machine production process and punching
Cooling water in rotation flour mill pulverizing process after use is flowed in regulating reservoir so that cooling water is staticly settled in regulating reservoir,
So that silica flour precipitation is separated with cooling water；After silica flour is separated with cooling water in B, specific steps A, derived by by cooling water, and
Water conservancy diversion is collected to the silica flour in neutralization pond, being deposited in regulating reservoir bottom, and is dried by drying machine and grinder is ground,
The silica flour for obtaining is recycled；
2) cooling water is neutralized, and is concretely comprised the following steps：A, preparing lime milk liquid, take calcium hydroxide 10-16 parts and water purification 50-80 parts together
It is put into milk of lime tank diameter, calcium hydroxide and water purification is mixed by the lime that 12.5-32% concentration is obtained by mixer
Emulsion；B, obtained lime slurry in specific steps A is added in neutralization pond so that lime slurry is mixed with the cooling water of acidity
Close, reaction 1-3 hours of going forward side by side so that the water outlet PH of neutralization pond reaches 6-8, while by water outlet water conservancy diversion to mixing pit；
3) cooling water mixed flocculation, concretely comprises the following steps：A, preparation flocculant, take aluminium polychloride 4-6 parts and water purification 80-120 parts
Stirred by mixer and mixed, it is the PAC solution of 3.33-7.5% that concentration is obtained, and takes polyacrylamide 1-3 parts and water purification 200-
600 parts of mixings, it is the PAM solution of 0.17-1.5% that concentration is obtained；It is B, specific by every cubic metre of water outlet addition in mixing pit
PAC solution 6-10L obtained in step A, PAM solution 2-4L, while start mixer continuously running so that PAC solution and PAM are molten
Liquid energy is enough to be well mixed with water outlet, and prevents precipitation and gum deposit；C, by integrated form sewage purification device by inertia and turbulent flow
Shearing force water outlet can quickly form the larger floccule body such as alumen ustum in the presence of PAC solution and PAM solution, then will be mixed with wadding
The water outlet water conservancy diversion of solidifying body is in filtering ponds；
4) go out water filtration and floccule body is reclaimed：Press filtration is carried out to the water outlet in filtering ponds by plate-frame filtering forcing press so that
Floccule body in water outlet stops filtering, and water outlet is imported in stabilization pond, while floccule body precipitates to form sludge, then by sludge
Take out and desiccation；
5) effluent recycling in stabilization pond is continued with as industrial water.
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| CN104671498A (en) * | 2015-01-23 | 2015-06-03 | 昆明理工大学 | Treatment method and device of wastewater containing superfine silicon powder |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107117740A (en) * | 2017-06-09 | 2017-09-01 | 浙江睿升环保科技有限公司 | Method of wastewater treatment in reverse osmosis membrane production process |
| CN107522272A (en) * | 2017-08-23 | 2017-12-29 | 沈阳建筑大学 | Promote the mixed flocculation agent and its application method of aerobic particle mud |
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Application publication date: 20170531 |
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