CN105967378A - Device and method for synchronously recycling ammonia nitrogen and phosphorus from sewage - Google Patents
Device and method for synchronously recycling ammonia nitrogen and phosphorus from sewage Download PDFInfo
- Publication number
- CN105967378A CN105967378A CN201610249075.2A CN201610249075A CN105967378A CN 105967378 A CN105967378 A CN 105967378A CN 201610249075 A CN201610249075 A CN 201610249075A CN 105967378 A CN105967378 A CN 105967378A
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- sewage
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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
-
- 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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- 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
- C02F1/5281—Installations for water purification using chemical 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Activated Sludge Processes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
A device for synchronously recycling ammonia nitrogen and phosphorus from sewage comprises an aeration zone (1), a transition zone (2), a settling zone (3) and a sludge zone (4) which construct a device main body, and an absorption zone (5) arranged outside the device main body and connected with the device main body through a pipeline inserting into the interior of the absorption zone. With use of the device for treating the sewage, hot air and a metal salt are respectively introduced into the aeration zone, the ammonia nitrogen in the sewage is blow-stripped and absorbed, and at the same time, phosphate radicals form a precipitate and are discharged, so that the ammonia nitrogen and phosphorus are synchronously recycled. With the use of the device and method, the recycling rates of the ammonia nitrogen and phosphorus in the sewage are 82% or more and 95% or more respectively; the device and method have the advantages of stable effect, high recycling rate, simple operation and easy operation; the device can be arranged flexibly according to the need of the process and has a broad application prospect.
Description
Technical field
The present invention relates to a kind of synchronization from sewage and reclaim ammonia nitrogen and the device and method of phosphorus, belong to water pollution control and resource regeneration
Technical field.
Background technology
The inorganic matters such as nitrogen in sewage, phosphorus are often considered to cause the main arch-criminal of the environmental pollutions such as body eutrophication, therefore, and people
Spend substantial amounts of material resources, financial resources to remove the nitrogen in sewage, phosphorus, minimize impact with reach environmental pollution.According at present
From the point of view of each sewage treatment process is to the disposition of sewage, the removal effect of COD and SS is preferable, but the removal situation of nitrogen, phosphorus
The most not ideal.High ammonia nitrogen in sewage can affect the activity of microorganism, and microorganism also can when aerobic phosphorus absorption, anaerobic phosphorus release
Clash with the technique removing ammonia nitrogen, cause nitrogen, the aqueous concentration of phosphorus does not reaches discharge standard.
Being difficult to process problem up to standard for nitrogen, phosphorus, many researchers propose the technique such as advanced treating, multistep treatment,
Make nitrogen phosphorus be removed, but these techniques have, and complex process, floor space be big, energy consumption increases and the new problem such as management difficulty.
Meanwhile, going to denitrogenate, phosphorus time, also result in the waste of these resources.
Summary of the invention
For problem above, the present invention provides a kind of synchronization from sewage to reclaim ammonia nitrogen and the device of phosphorus, it is adaptable to process various height
Ammonia nitrogen, the sewage of high phosphorus concentration.Apparatus of the present invention can reclaim ammonia nitrogen and phosphor resource from sewage, and can need spirit according to technique
Live and arrange this device, simultaneously through the process of this device, the biodegradability of sewage be improved significantly.
Ammonia nitrogen, when water condition is alkalescence and heating, can evaporate into air from water body with the form of ammonia.Its volatilization process can
It is expressed as with chemical formula:
NH4 +→NH3↑+H+
By being passed through hot-air in sewage, hot-air, through the effect of aerator, forms substantial amounts of small hot-air, small
Hot-air contact with water body, so that the heated effect of ammonia nitrogen in water body and enter in absorbing liquid with air, ammonia nitrogen
Thus be recycled.
Phosphate radical in water body can generate ammoniomagnesium phosphate and magnesium phosphate precipitation with the reactive magnesium in water body.Its precipitation process can be used
Chemical formula is expressed as:
Mg2++PO4 3-=Mg3(PO4)2↓
Mg2++NH4 ++PO4 3-+6H20=MgNH4PO4·6H20↓
By putting into magnesium salt in sewage, the phosphate radical in sewage can be made to generate precipitation, thus be recovered to phosphorus.Therefrom it has been also found that
While reclaiming phosphorus, ammonia nitrogen has also assisted in reaction, is the most also conducive to the resource of ammonia nitrogen to reclaim.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of synchronization from sewage reclaims ammonia nitrogen and the device of phosphorus, including: (1) aeration zone, main ammonia nitrogen removal and phosphate radical
Learn conversion zone, make ammonia-nitrogen desorption by hot-air and play stirring action；(2) transition region, is arranged at the lower section of aeration zone,
Avoid aeration on decanting zone and the impact in mud district；(3) decanting zone, is arranged at the outside of aeration zone, makes precipitation and the water of generation
Body separates；(4) mud district, is arranged at the lower section of transition region, the phosphorus magnesium precipitate produced for of short duration storage；(5) uptake zone,
Equipped with absorbing liquid, for absorbing by the ammonia nitrogen gas of stripping.Wherein, aeration zone, transition region, decanting zone and mud district constitute
The main body of apparatus of the present invention, uptake zone is arranged on the outside of apparatus main body, by inserting the master of the pipeline within uptake zone and device
Body connects.
For the ease of handling and operation, the main body of apparatus of the present invention can be divided into again I and II two parts, and I part includes inside it
Aeration zone, II part includes its internal transition region, decanting zone and mud district, with I within wherein decanting zone is positioned at II part
The region of formation it is spaced outside part.
Can be connected by modes such as flange, screw thread or sleeves between described I part and II part.
Being provided with into water and drug-feeding tube in described aeration zone, one end that water inlet and drug-feeding tube are positioned at outside aeration zone is respectively provided with into water
Mouth and feeding opening；Being provided with air inlet pipe in described aeration zone, air inlet pipe is positioned at the one end outside aeration zone and arranges air inlet, air inlet
Pipe is positioned at the one end within aeration zone and connects aerator；It is additionally provided with gas outlet, by pipeline and absorption outside described aeration zone
District connects；The top of described decanting zone is provided with downflow weir and outlet；The bottom in described mud district is provided with Valve controlling
Mud discharging mouth.
Preferably, described aeration zone is cylindrical, and its ratio of height to diameter is (2.5～8): 1；
Preferably, described transition region is cylindrical, and its ratio of height to diameter is (0.6～1.5): 1；The hydraulic detention time of transition region can be
0.5～2.5h.
Preferably, the ratio of height to diameter of described decanting zone is (3～6): 1, and the hydraulic detention time of decanting zone can be 2～12h.
Preferably, described downflow weir is triangular sawtooth shape；
Preferably, described mud district is triangular pyramidal, can be 30 °～60 ° with the angle of inclination of horizontal plane, the mud in mud district
The time of staying can be 6～48h.
Preferably, described uptake zone can be cylindrical or square column type, and the absorbing liquid of uptake zone can be concentration 10～the acid solution of 30%.
The present invention also provides for a kind of utilizing said apparatus to synchronize to reclaim ammonia nitrogen and the method for phosphorus from sewage, comprises the steps:
First the pH for the treatment of sewage is adjusted to 4～14, enters aeration zone (1) by water inlet (6), then by air inlet (8)
In aeration zone, it is passed through hot-air, forms substantial amounts of micro-bubble and waste water by the effect of aerator (10), make dirt
Ammonia nitrogen in water is by stripping, and is entered in uptake zone (5) be absorbed by liquid absorption by gas outlet (9), and ammonia nitrogen is recycled；
Meanwhile, in sewage, add slaine by feeding opening (7), by the stirring action of air, the phosphate radical in sewage rapidly with
Reacting metal salt generates precipitation, and the sewage through reaction enters into transition region (2) from aeration zone (1), subsequently into decanting zone (3)
Settling, after precipitation separates with water body, water body passes through downflow weir (11), outlet (12) discharge；Precipitate
Matter enters into mud district (4), is discharged by the mud discharging mouth (14) controlled by valve (13), precipitation is dried thus be recovered to
Phosphorus.
Preferably, the temperature being passed through hot-air in aeration zone is 80～100 DEG C, and aeration time is 3～6h.
Described slaine includes but not limited to the magnesium salt of solubility, iron salt and calcium salt one of which.
Preferably, in above-mentioned operational approach, add slaine and be characterised by: when treatment sewage pH is 8～11, throw
Add magnesium salt；When treatment sewage pH is 4～7, add iron salt；When treatment sewage pH is more than 11, add calcium salt.
The method and device synchronizing recovery ammonia nitrogen and phosphorus that the present invention provides has the advantages that can be effectively in sewage
Ammonia nitrogen and the pollutant such as phosphorus be converted into resource and reclaim, it is achieved turn waste into wealth；Reduce the ammonia nitrogen in sewage and phosphorus concentration,
There is the biodegradability improving sewage；Apparatus of the present invention reclaim ammonia nitrogen and the effect stability of phosphorus, and the response rate is high, simple to operate, hold
Easily operation, can need this device of flexible arrangement according to technique.
Accompanying drawing explanation
Fig. 1 is the structural representation of device in the embodiment of the present invention；
Fig. 2 is I part-structure schematic diagram of apparatus main body in the embodiment of the present invention；
Fig. 3 is II part-structure schematic diagram of apparatus main body in the embodiment of the present invention；
Wherein: 1-aeration zone, 2-transition region, 3-decanting zone, 4-mud district, 5-uptake zone, 6-water inlet, 7-enters
Medicine mouth, 8-air inlet, 9-gas outlet, 10-aerator, 11-downflow weir, 12-outlet, 13-valve, 14
-mud discharging mouth, I part of I-apparatus main body, II part of II-apparatus main body..
Detailed description of the invention
Below by specific embodiment, and combine accompanying drawing, be further discussed below the present invention.Unless stated otherwise, embodiment
Middle techniques not described means all can realize by mode known in those skilled in the art.It addition, embodiment is interpreted as
Illustrative, and unrestricted the scope of the present invention, the spirit and scope of the invention are limited only by the claims that follow.For ability
For field technique personnel, on the premise of without departing substantially from spirit and scope of the present invention, to the material component in these embodiments, use
Various amendments that amount, size, shape are carried out, replace, improve and fall within protection scope of the present invention, and the present invention is limited
Design parameter should have admissible range of error.
In order to be more fully understood that the present invention, main portions or parts to relating in figure are numbered.It is identically numbered expression phase
With or similar position or parts, there is essentially identical function, but its size concrete in difference figure or embodiment, shape,
Structure is the most identical.
Embodiment 1
With reference to shown in Fig. 1-3, in one exemplary embodiment of the present invention, a kind of from sewage, synchronize to reclaim ammonia nitrogen and phosphorus
Device, including: aeration zone 1, main ammonia nitrogen removal and phosphate radical chemical reaction region, make ammonia-nitrogen desorption by hot-air and rise
To stirring action；Transition region 2, is arranged at the lower section of aeration zone 1, it is to avoid aeration is on decanting zone and the impact in mud district；Sedimentation
District 3, is arranged at the outside of aeration zone 1, makes the precipitation of generation separate with water body；Mud district 4, is arranged at the lower section of transition region 2,
The precipitation produced for of short duration storage；Uptake zone 5, equipped with absorbing liquid, for absorbing by the ammonia nitrogen gas of stripping.Wherein,
Aeration zone 1, transition region 2, decanting zone 3 and mud district 4 constitute the main body of apparatus of the present invention, and uptake zone 5 is arranged on device master
The outside of body, is connected with apparatus main body by inserting the pipeline within uptake zone.
The main body of apparatus of the present invention can be divided into again I and II two parts, and I part includes its internal aeration zone 1, II part bag
Include its internal transition region 2, decanting zone 3 and mud district 4, be spaced outside wherein decanting zone 3 is positioned at I part and within II part
The region formed.By making the Flange joint of internal diameter 84mm by oneself between described I part and II part.
Be provided with into water and drug-feeding tube in described aeration zone 1, water inlet and drug-feeding tube be positioned at the one end outside aeration zone be respectively provided with into
The mouth of a river 6 and feeding opening 7；Being provided with air inlet pipe in described aeration zone 1, one end that air inlet pipe is positioned at outside aeration zone arranges air inlet
Mouth 8, air inlet pipe is positioned at the one end within aeration zone and connects aerator 10；Described aeration zone 1 is outside is additionally provided with gas outlet 9,
It is connected with uptake zone 5 by pipeline；The top of described decanting zone 3 is provided with downflow weir 11 and outlet 12；Described mud district 4
Bottom be provided with valve 13 control mud discharging mouth 14.
In the present embodiment, each several part parameter of device is as follows: apparatus main body is cylinder；The height of aeration zone 1 is 2dm,
Radius is 0.3dm, and effective volume is 5L；The height of transition region 2 is 0.5dm, and radius is 0.42dm, and effective volume is 0.25
L；The height of decanting zone 3 is 2dm, and radius is 0.42dm, and effective volume is 0.5L；Mud district 4 is triangular pyramidal, hypotenuse
Being 30 ° with the angle of inclination of horizontal plane, effective volume is 0.12L；Uptake zone 5 is placed 30% sulfuric acid solution.
Utilize said apparatus, centrifugalled Beijing high ferro fecal sewage is carried out the recovery experiment of ammonia nitrogen and phosphorus, process
Scale is 1L/d.After being adjusted pH, the water quality situation of this high ferro fecal sewage is as follows: pH 9.0, COD 3500mg/L,
Ammonia nitrogen 2700mg/L, phosphate 110mg/L.
High ammonia nitrogen, the sewage of high phosphorus enter aeration zone 1 from water inlet 6, and magnesium salt enters aeration zone 1, hot-air by feeding opening 7
Entered aeration zone 1 by air inlet 8 and formed small hot-air by aerator 10, by the heat effect of air, making water body
In ammonia nitrogen obtain stripping, and the stirring action of air makes magnesium salt carry out with being swift in response of phosphate radical.Sewage through reaction
Enter into transition region 2 from aeration zone 1, settle subsequently into decanting zone 3, after precipitation separates with water body, water body
By downflow weir 11, outlet 12 discharge；Deposit enters into mud district 4, by the mud discharging mouth controlled by valve 13
14 discharge.The ammonia of stripping is entered into uptake zone 5 along with hot-air by gas outlet 9, sulfuric acid solution absorb ammonia,
Residual air enters air.
The parameter of hot-air stripping ammonia nitrogen is: air themperature 100 DEG C, aeration time 6h, throughput 0.7m3/ h, in sewage
With Air blowing and entered recovery in 30% sulfuric acid absorption liquid by the ammonia nitrogen of stripping, obtain ammonia nitrogen and reclaim product.According to magnesium and phosphoric acid
The mol ratio of root is that 5:1 adds magnesium chloride medicament, and stripping air can play the effect of stirring, makes phosphorus and magnesium chloride quickly form phosphorus
Acid ammonium magnesium and magnesium phosphate precipitation, will precipitate natural air drying or dry under conditions of less than 50 DEG C, and obtaining phosphorus and reclaim product.
Utilizing said apparatus and method to process sewage, treatment scale is 2L/d, and effluent index is: pH 8.0～8.8, COD 3350
Mg/L, ammonia nitrogen 500mg/L, phosphate 5.5mg/L.It is 4.3% to COD clearance, ammonia nitrogen and the phosphatic response rate
Respectively reach 81.5% and 95%.Ammonia nitrogen can be 100% absorbed by the acid, and the ammonium salt of formation can be made the ammonium fertilizer in agricultural production and use,
During the most whole, ammonia nitrogen is not discharged into the atmosphere formation secondary pollution；Being formed in phosphorus product, the ratio shared by element phosphor is
12～23.6%.
Claims (10)
1. one kind synchronizes to reclaim ammonia nitrogen and the device of phosphorus from sewage, it is characterised in that described device includes: aeration zone (1)；Cross
Cross district (2), be arranged at the lower section of aeration zone；Decanting zone (3), is arranged at the outside of aeration zone；Mud district (4), if
It is placed in the lower section of transition region；Uptake zone (5), equipped with absorbing liquid；Wherein, aeration zone (1), transition region (2), sedimentation
District (3) and mud district (4) constitute the main body of described device, and uptake zone (5) are arranged on the outside of apparatus main body, logical
Cross insertion pipeline within uptake zone to be connected with the main body of device.
A kind of synchronization from sewage reclaims ammonia nitrogen and the device of phosphorus, it is characterised in that described device
Main body is divided into again I and II two parts, and I part includes that its internal aeration zone (1), II part include its internal mistake
Cross district (2), decanting zone (3) and mud district (4), within wherein decanting zone (3) are positioned at II part with I part outside
The region that interval is formed；It is connected by the way of flange, screw thread or sleeve between I part with II part.
A kind of synchronization from sewage reclaims ammonia nitrogen and the device of phosphorus, it is characterised in that described exposure
Being provided with into water and drug-feeding tube in gas district (1), one end that water inlet and drug-feeding tube are positioned at outside aeration zone is respectively provided with water inlet
And feeding opening (7) (6)；Described aeration zone is provided with air inlet pipe in (1), and air inlet pipe is positioned at the one end outside aeration zone
Arranging air inlet (8), air inlet pipe is positioned at the one end within aeration zone and connects aerator (10)；Described aeration zone is outside also
It is provided with gas outlet (9), is connected with uptake zone (5) by pipeline；The top of described decanting zone is provided with downflow weir (11)
With outlet (12)；The bottom of described mud district (4) is provided with the mud discharging mouth (14) that valve (13) controls.
A kind of synchronization from sewage reclaims ammonia nitrogen and the device of phosphorus, it is characterised in that described exposure
Gas district (1) is cylindrical, and its ratio of height to diameter is (2.5～8): 1.
A kind of synchronization from sewage reclaims ammonia nitrogen and the device of phosphorus, it is characterised in that described mistake
Crossing district (2) is cylinder, and its ratio of height to diameter is (0.6～1.5): 1；The hydraulic detention time of transition region is 0.5～2.5h.
A kind of synchronization from sewage reclaims ammonia nitrogen and the device of phosphorus, it is characterised in that described heavy
The ratio of height to diameter of fall district (3) is (3～6): 1；The hydraulic detention time of decanting zone is 2～12h.
A kind of synchronization from sewage reclaims ammonia nitrogen and the device of phosphorus, it is characterised in that described dirt
Mud district (4) is triangular pyramidal, is 30 °～60 ° with the angle of inclination of horizontal plane；The sludge retention time in mud district is 6～48
h。
A kind of synchronization from sewage reclaims ammonia nitrogen and the device of phosphorus, it is characterised in that described suction
Receiving district (5) is cylindrical or square column type, and the absorbing liquid of uptake zone is concentration 10～the acid solution of 30%.
9. utilize the arbitrary described device of claim 1-8 to synchronize to reclaim ammonia nitrogen and a method for phosphorus from sewage, comprise the steps:
First the pH for the treatment of sewage is adjusted to 4～14, enters aeration zone (1) by water inlet (6), then by air inlet (8)
In aeration zone, it is passed through hot-air, forms substantial amounts of micro-bubble and waste water by the effect of aerator (10),
Make the ammonia nitrogen in sewage by stripping, and enter in uptake zone (5) be absorbed by liquid absorption by gas outlet (9), ammonia nitrogen
It is recycled；Meanwhile, in sewage, slaine is added by feeding opening (7), by the stirring action of air, in sewage
Phosphate radical rapidly generate precipitation with reacting metal salt, enter into transition region (2) through the sewage reacted from aeration zone (1),
Settling subsequently into decanting zone (3), after precipitation separates with water body, water body passes through downflow weir (11), by
Outlet (12) is discharged；Deposit enters into mud district (4), by the mud discharging mouth (14) controlled by valve (13)
Discharge, precipitation is dried thus is recovered to phosphorus.
10. as claimed in claim 9 synchronization from sewage reclaims ammonia nitrogen and the method for phosphorus, it is characterised in that be passed through heat in aeration zone
The temperature of air is 80～100 DEG C, and aeration time is 3～6h；Described slaine include but not limited to solubility magnesium salt,
Iron salt and calcium salt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610249075.2A CN105967378A (en) | 2016-04-20 | 2016-04-20 | Device and method for synchronously recycling ammonia nitrogen and phosphorus from sewage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610249075.2A CN105967378A (en) | 2016-04-20 | 2016-04-20 | Device and method for synchronously recycling ammonia nitrogen and phosphorus from sewage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105967378A true CN105967378A (en) | 2016-09-28 |
Family
ID=56993839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610249075.2A Pending CN105967378A (en) | 2016-04-20 | 2016-04-20 | Device and method for synchronously recycling ammonia nitrogen and phosphorus from sewage |
Country Status (1)
| Country | Link |
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| CN (1) | CN105967378A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108057414A (en) * | 2017-12-19 | 2018-05-22 | 江南大学 | A kind of device and method that nitrogen phosphorus in waste water is recycled using ammoniomagnesium phosphate crystal |
| CN115445249A (en) * | 2022-10-09 | 2022-12-09 | 铜陵华兴精细化工有限公司 | Solution deamination equipment for sodium persulfate processing |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108057414A (en) * | 2017-12-19 | 2018-05-22 | 江南大学 | A kind of device and method that nitrogen phosphorus in waste water is recycled using ammoniomagnesium phosphate crystal |
| CN115445249A (en) * | 2022-10-09 | 2022-12-09 | 铜陵华兴精细化工有限公司 | Solution deamination equipment for sodium persulfate processing |
| CN115445249B (en) * | 2022-10-09 | 2023-08-18 | 铜陵华兴精细化工有限公司 | Solution deamination equipment for sodium persulfate processing |
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Application publication date: 20160928 |