CN106396184A - Ammonia stripping process and device for high-ammonia-nitrogen wastewater - Google Patents
Ammonia stripping process and device for high-ammonia-nitrogen wastewater Download PDFInfo
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- CN106396184A CN106396184A CN201611012321.9A CN201611012321A CN106396184A CN 106396184 A CN106396184 A CN 106396184A CN 201611012321 A CN201611012321 A CN 201611012321A CN 106396184 A CN106396184 A CN 106396184A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/58—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01C—AMMONIA; CYANOGEN; COMPOUNDS THEREOF
- C01C1/00—Ammonia; Compounds thereof
- C01C1/24—Sulfates of ammonium
- C01C1/242—Preparation from ammonia and sulfuric acid or sulfur trioxide
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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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/50—Inorganic acids
- B01D2251/506—Sulfuric acid
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
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Abstract
The invention relates to an ammonia stripping process and device for high-ammonia-nitrogen wastewater. By arranging a sedimentation process after pH regulation by adding alkali and an ammonia stripping process to be performed in a closed reaction device, performing aeration by means of jet-flow aeration and fully utilizing waste heat of a biochemical system to increase the temperature of high-ammonia-nitrogen wastewater, the ammonia removing efficiency is greatly improved; by performing reflux on sediment sludge produced in the system, the amount of used lime or lime milk is saved, and finally ammonia gas produced in the system is absorbed by adopting sulfuric acid to obtain ammonium sulfate which is recycled as ammonia fertilizer, such that the entire system not only has no secondary pollution, but also is high in ammonia removing efficiency and is low in operating cost and the technique can be more widely popularized and applied.
Description
Technical field
The invention belongs to high ammonia-nitrogen wastewater processing technology field, the ammonia aeration technique of more particularly to a kind of high ammonia-nitrogen wastewater
And its device.
Background technology
Because high ammonia-nitrogen wastewater (as percolate, wastewater from chemical industry etc.) is very big to environmental hazard, and it is difficult to process, be full
The requirement that the sufficient public improves constantly to environmental quality, country has worked out increasingly stricter discharge standard to ammonia nitrogen, exploiting economy,
Efficient denitrogenation technology has become emphasis and the focus of water pollution engineering field.
In recent years, both at home and abroad more research had been carried out to ammonia nitrogen waste water process aspect.Although many methods can have
Effect removes ammonia nitrogen, but really only has a few for what high-concentration ammonia nitrogenous wastewater was processed, in high-concentration ammonia nitrogenous wastewater industry, special
It is not landfill leachate treatment industry, ammonia nitrogen is often up to more than 2000mg/L, if directly carrying out biological denitrificaion, treatment of process streams
Journey is long, high energy consumption, and denitrification process generally requires to add a large amount of organic carbon sources, and operating cost is high, and final outflow water is also difficult to
Reach new discharge standard, especially total nitrogen difficult to reach discharge standard.Therefore, high ammonia-nitrogen wastewater generally requires using pretreatment
Method carries out deamination.
At present, conventional preprocess method has chemical precipitation method (MAP), break point chlorination method and ammonia aeration etc..
Chemical precipitation method (the MAP precipitation method) removal efficiency preferably, and is not subject to temperature limiting, simple to operate, forms phosphoric acid
The precipitating sludge of ammonium magnesium can be used as compound fertilizer, realizes twice laid, thus offsetting a part of cost；If producing phosphorus with some
The industrial enterprise of hydrochlorate waste water and the cartel producing bittern, can save medicament expense and use, beneficial to large-scale application, but chemical
The precipitation method, due to being limited by ammonium magnesium phosphate solubility product, after the ammonia nitrogen in waste water reaches finite concentration, then put into pharmaceutical quantities, then go
Except DeGrain, and input cost greatly increases, and the mud of generation is more, processing cost is high, and adds and introduce during medicament
Chlorion and remaining phosphorus easily cause secondary pollution, seldom adopt in high-concentration ammonia nitrogenous wastewater industry.
The ammonia removal efficiency of break point chlorination method is high, and clearance can reach more than 99%, effect stability, and investment goods is few, reaction
Speed is fast, thoroughly.But the chemical feeding quantity of break point chlorination is big, processing cost is high, and accessory substance chloramines and chlorinatedorganic can cause
Secondary pollution, typically be suitable for low ammonia nitrogen concentration (<Waste water 50mg/L), is used for the advanced treating of ammonia nitrogen waste water.
Ammonia aeration method removes ammonia nitrogen effect preferably, easy and simple to handle it is easy to control, be suitable at the deamination of high ammonia-nitrogen wastewater
Reason, is high ammonia-nitrogen wastewater preconditioning technique the most frequently used at present.But traditional ammonia aeration method is to add in high ammonia-nitrogen wastewater first
Enter lime or milk of lime, the pH adjusting waste water to strong basicity environment so as to there is precipitation reaction, then by the supernatant after precipitation
Carry out ammonia aeration, this mode there is problems that plus alkali adjust during pH precipitated, can produce substantial amounts of simultaneously
Ammonia, this can bring serious secondary pollution problem, and frequent fouling in stripping tower, during low temperature, ammonia nitrogen removal efficiency is low, makes
The use obtaining traditional ammonia aeration technology has certain limitation.
Content of the invention
The purpose of the present invention is serious for secondary pollution problem in above-mentioned traditional ammonia aeration technology, and ammonia removal efficiency is low,
And in stripping tower frequent fouling technical problem, provide ammonia aeration technique and its device of a kind of high ammonia-nitrogen wastewater, significantly
Improve ammonia removal efficiency, it is to avoid secondary pollution, reduce operating cost.
Technical scheme
In order to realize above-mentioned technical purpose, the present invention design a kind of high ammonia-nitrogen wastewater ammonia aeration technique it is characterised in that
It includes following step：
The first step, high ammonia-nitrogen wastewater respectively enters ammonia aeration reaction system with lime or milk of lime, adjusts the pH of waste water；
Second step, blasts air in the waste water after adjusting to the first step, carries out ammonia aeration, obtain supernatant and ammonia；
3rd step, adds strong acid to carry out pH readjustment, step (2) obtains to after second step ammonia aeration in the supernatant obtaining
Ammonia adopts sulfuric acid absorption.
Further, the described first step pH adjust during constantly stirred, final pH should adjust to 10-13 it
Between；
Described second step is to blast air by air blast to the bottom of ammonia aeration reaction system, and using jet-flow aeration
Mode carries out aeration, and the gas-water ratio in control system is 1000～5000, then using the waste heat of biochemical system, system is carried out
Heating, now constantly produces ammonia and substantial amounts of white foam in system, ammonia rises to gas collection area and is expelled to ammonia absorption dress
In putting, foam rises to froth zone, sprays clear water by the clear water spray equipment on the top of reactor downwards with certain speed,
To reduce the generation of foam, by the overflow mechanism above reactor, excessive for foam outflow system is post-processed；Simultaneity factor
The substantial amounts of particulate matter of middle generation, particulate matter is precipitated to the settling zone of reactor bottom, and partly precipitated passes through sludge reflux pump reflux
It is circulated utilization to lime or milk of lime case, excess sludge passes through mud valve discharge system；The last supernatant producing of system
Enter pH readjustment case.
Need to control between pH to 6.0-8.5 during the pH value readjustment of described 3rd step；Meanwhile, the 3rd step adopts sulfuric acid to inhale
Receive the ammonium sulfate obtaining to recycle as ammonium is fertile.
Device for the ammonia aeration technique of above-mentioned high ammonia-nitrogen wastewater it is characterised in that：It is anti-that it includes raw water box, ammonia aeration
Answer device, lime or milk of lime case, filtered water tank, pH readjustment case, produce water tank, gas absorber, ammonium sulfate collection box；
Raw water box is connected with ammonia aeration reactor, equipped with the first intake pump on connecting line；Lime or milk of lime case and ammonia
Stripping reactor connects, equipped with the first dosing pump on connecting line；Filtered water tank is connected with ammonia aeration reactor, and connecting line fills
There is the second intake pump；The water outlet output end of ammonia aeration reactor is connected with pH readjustment case, and pH readjustment case is connected with producing water tank；Ammonia blows
The foam output end of dealkylation reaction device is connected with foam treatment device；The ammonia output end of ammonia aeration reactor is with gas absorber even
Connect, the output end of gas absorber is connected with ammonium sulfate collection box.
Further, described ammonia aeration reactor is made up of reaction zone, settling zone and froth zone three part.Set inside reaction zone
There is pH meter, to control the pH of waste water, bottom is provided with jet aerator, and the inlet end of jet aerator is with outside air blast even
Connect, the water inlet end of jet aerator is connected with the port of export of the first intake pump, equipped with control valve on connecting line；The bottom of reaction zone
Portion is additionally provided with biochemical system waste heat thermal source connectivity port.The base sludge output end of settling zone connects back to lime or milk of lime case,
Connecting line is provided with mud valve and sludge reflux pump.The top of froth zone is provided with spray equipment, to reduce the big volume production of foam
Raw, the water inlet end of spray equipment is connected with the port of export of the second intake pump；The top of spray equipment is ammonia gas collection area.
Further, the entrance point of described gas absorber is connected with sulfuric acid case, equipped with the second dosing pump on connecting line.
Further, described lime or milk of lime case are adjusted back in case with pH and are respectively equipped with the first mixer and the second mixer.
Beneficial effect
The present invention is by being arranged on an airtight reaction dress by adding the precipitation process after alkali pH is adjusted with ammonia aeration process
Carry out in putting, and aeration is carried out by jet-flow aeration mode, the waste heat simultaneously making full use of biochemical system gives up to ammonia nitrogen in high density
Water is heated up, and so substantially increases ammonia removal efficiency；And the precipitating sludge producing in system is flowed back, save
Lime or the usage amount of milk of lime, the ammonia finally system being produced adopts sulfuric acid absorption, and the ammonium sulfate obtaining returns as ammonium is fertile
Receive using so that whole system not only non-secondary pollution, and ammonia removal efficiency is high, operating cost is low, so that the pushing away of this technology
Wide and be more widely applied.
Brief description
Accompanying drawing 1 is the process chart of the embodiment of the present invention.
Accompanying drawing 2 is the equipment connecting relation schematic diagram of the embodiment of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, the present invention will be further described.
Embodiment
As shown in Figure 2, the device of the ammonia aeration technique of a kind of high ammonia-nitrogen wastewater, it includes raw water box 4, ammonia aeration reaction
Device 7, lime or milk of lime case 1, filtered water tank 14, pH readjustment case 19, product water tank 22, gas absorber 26, ammonium sulfate collection box 27；
Raw water box 4 is connected with ammonia aeration reactor 7, equipped with the first intake pump 5 on connecting line；Lime or milk of lime case 1
It is connected with ammonia aeration reactor 7, equipped with the first dosing pump 3 on connecting line；Filtered water tank 14 is connected with ammonia aeration reactor 7, even
Equipped with the second intake pump 13 on adapter road；The water outlet output end of ammonia aeration reactor 7 is adjusted back case 20 with pH value and is connected, and pH value is adjusted back
Case 20 is connected with producing water tank 22；The foam output end of ammonia aeration reactor 7 is connected with foam treatment device 23；Ammonia aeration reactor
7 ammonia output end is connected with gas absorber 26, and the output end of gas absorber 26 is connected with ammonium sulfate collection box 27.
Described ammonia aeration reactor 7 is made up of reaction zone 8, settling zone 9 and froth zone 10 3 part.Set inside reaction zone 8
There is pH meter 11, to control the pH value of waste water, bottom is provided with jet aerator 15, the inlet end of jet aerator 15 and outside drum
Blower fan 16 connects, and the water inlet end of jet aerator 15 is connected with the port of export of the first intake pump 5, equipped with control valve on connecting line
6；The bottom of reaction zone 8 is additionally provided with biochemical system waste heat thermal source connectivity port 17, and the base sludge output end of settling zone 9 connects back to
Lime or milk of lime case 1, connecting line is provided with mud valve 18 and sludge reflux pump 19；The top of froth zone 10 is provided with spray dress
Put 12, to reduce a large amount of generations of foam, the water inlet end of spray equipment 12 is connected with the port of export of the second intake pump 13；Spray dress
The top putting 12 is ammonia gas collection area.
The entrance point of described gas absorber 26 is connected with sulfuric acid case 24, equipped with the second dosing pump 5 on connecting line.
Described lime or milk of lime case 1 are adjusted back in case 20 with pH and are respectively equipped with the first mixer 1 and the second mixer 21.
Carry out ammonia aeration technical process using said apparatus as follows：
The first step, high ammonia-nitrogen wastewater is pumped into ammonia aeration reactor respectively with lime or milk of lime, in the bar being stirred continuously
Under part, adjust between the pH to 10～13 of waste water；
Second step, blasts air by air blast to the bottom of ammonia aeration reaction system, and by the way of jet-flow aeration
Carry out aeration, the gas-water ratio in control system is between 1000～5000, then using the waste heat of biochemical system, system is carried out
Heating, now constantly produces ammonia and substantial amounts of white foam in system, ammonia rises to gas collection area and is expelled to ammonia absorption dress
In putting, foam rises to froth zone, sprays clear water by the clear water spray equipment on the top of reactor downwards with certain speed,
To reduce the generation of foam, by the overflow mechanism above reactor, excessive for foam outflow system is post-processed；Simultaneity factor
The substantial amounts of particulate matter of middle generation, particulate matter is precipitated to the settling zone of reactor bottom, and partly precipitated passes through sludge reflux pump reflux
It is circulated utilization to lime or milk of lime case, excess sludge passes through mud valve discharge system；The last supernatant producing of system
Enter pH readjustment case.
3rd step, adds strong acid in the supernatant obtaining to after above-mentioned ammonia aeration, carries out entering after pH pulls back to 6.0-8.5
Produce water tank；The ammonia that second step produces simultaneously is absorbed using sulfuric acid, and the ammonium sulfate obtaining recycles as ammonium is fertile.
The present invention is by being arranged on an airtight reaction by adding the precipitation process after alkali pH value is adjusted with ammonia aeration process
Carry out in device, and aeration is carried out by jet-flow aeration mode, the waste heat simultaneously making full use of biochemical system is to ammonia nitrogen in high density
Waste water is heated up, and so substantially increases ammonia removal efficiency；And the precipitating sludge producing in system is flowed back, save
The usage amount of lime or milk of lime, the ammonia finally system being produced adopts sulfuric acid absorption, and the ammonium sulfate that obtains is fertile as ammonium
Recycle so that whole system not only non-secondary pollution, and ammonia removal efficiency is high, operating cost is low, so that this technology
Promotion and application are more extensive.
Claims (6)
1. a kind of ammonia aeration technique of high ammonia-nitrogen wastewater is it is characterised in that it includes following step：
(1) high ammonia-nitrogen wastewater and lime or milk of lime respectively enter ammonia aeration reaction system, adjust the pH of waste water；
(2) blast air in the waste water after step (1) regulation, carry out ammonia aeration, obtain supernatant and ammonia；
(3) strong acid is added to carry out pH readjustment in the supernatant obtaining to after step (2) ammonia aeration, the ammonia that step (2) obtains is adopted
Use sulfuric acid absorption.
2. as claimed in claim 1 a kind of high ammonia-nitrogen wastewater ammonia aeration technique it is characterised in that：
The pH of described step (1) is constantly stirred during adjusting, and final ph should be adjusted between 10～13；
Control between pH to 6.0～8.5 during the pH readjustment of described step (3).
3. be used for above-mentioned high ammonia-nitrogen wastewater ammonia aeration technique device it is characterised in that：It includes raw water box (4), ammonia aeration
Reactor (7), lime or milk of lime case (1), filtered water tank (14), pH readjustment case (19), product water tank (22), gas absorber
(26), ammonium sulfate collection box (27)；
Raw water box (4) is connected with ammonia aeration reactor (7), equipped with the first intake pump (5), lime or milk of lime case on connecting line
(1) it is connected with ammonia aeration reactor (7), equipped with the first dosing pump (3) on connecting line, filtered water tank (14) and ammonia aeration reactor
(7) connect, equipped with the second intake pump (13) on connecting line, the water outlet output end of ammonia aeration reactor (7) adjusts back case with pH
(20) connect, pH readjustment case (20) is connected with producing water tank (22), and the foam output end of ammonia aeration reactor (7) processes dress with foam
Put (23) to connect, the ammonia output end of ammonia aeration reactor (7) is connected with gas absorber (26), gas absorber (26) defeated
Go out end to be connected with ammonium sulfate collection box (27).
4. the ammonia aeration technique of high ammonia-nitrogen wastewater as claimed in claim 3 device it is characterised in that：Described ammonia aeration reaction
Device (7) includes being provided with pH meter (11), to control waste water inside reaction zone (8), settling zone (9) and froth zone (10), reaction zone (8)
PH, bottom is provided with jet aerator (15), and the inlet end of jet aerator (15) is connected with outside air blast (16), jet
The water inlet end of aerator (15) is connected with the port of export of the first intake pump (5), equipped with control valve (6), reaction zone on connecting line
(8) bottom is additionally provided with biochemical system waste heat thermal source connectivity port (17)；
The base sludge output end of settling zone (9) connects back to lime or milk of lime case (1), and connecting line is provided with mud valve (18)
With sludge reflux pump (19)；
The top of froth zone (10) is provided with spray equipment (12) to reduce a large amount of generations of foam, the water inlet end of spray equipment (12)
It is connected with the port of export of the second intake pump (13), the top of spray equipment (12) is ammonia gas collection area.
5. the ammonia aeration technique of high ammonia-nitrogen wastewater as claimed in claim 3 device it is characterised in that：Described gas absorber
(26) entrance point is connected with sulfuric acid case (24), equipped with the second dosing pump (25) on connecting line.
6. the ammonia aeration technique of high ammonia-nitrogen wastewater as claimed in claim 3 device it is characterised in that：Described lime or lime
It is respectively equipped with the first mixer (1) and the second mixer (21) in newborn case (1) and pH readjustment case (20).
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| CN201611012321.9A CN106396184A (en) | 2016-11-17 | 2016-11-17 | Ammonia stripping process and device for high-ammonia-nitrogen wastewater |
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| CN201611012321.9A CN106396184A (en) | 2016-11-17 | 2016-11-17 | Ammonia stripping process and device for high-ammonia-nitrogen wastewater |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113149284A (en) * | 2021-04-30 | 2021-07-23 | 南通汇羽丰新材料有限公司 | Device and method for reducing ammonia nitrogen in PVDC resin production wastewater |
| CN113912234A (en) * | 2021-10-27 | 2022-01-11 | 龙佰禄丰钛业有限公司 | Method for treating sewage generated by producing titanium dioxide by chlorination process |
| CN114074998A (en) * | 2021-11-16 | 2022-02-22 | 中国科学院城市环境研究所 | Pretreatment method and system for recovering pipeline scaling prevention cooperative resources |
| CN114804437A (en) * | 2022-05-18 | 2022-07-29 | 深圳顺天环保实业有限公司 | Materialization removal system and method for nitrogen and phosphorus pollution factors in aquaculture wastewater |
| CN114832448A (en) * | 2022-04-14 | 2022-08-02 | 柳州钢铁股份有限公司 | Treatment method for ammonia desulphurization solution sludge precipitation in steel industry |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113149284A (en) * | 2021-04-30 | 2021-07-23 | 南通汇羽丰新材料有限公司 | Device and method for reducing ammonia nitrogen in PVDC resin production wastewater |
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| CN113912234A (en) * | 2021-10-27 | 2022-01-11 | 龙佰禄丰钛业有限公司 | Method for treating sewage generated by producing titanium dioxide by chlorination process |
| CN114074998A (en) * | 2021-11-16 | 2022-02-22 | 中国科学院城市环境研究所 | Pretreatment method and system for recovering pipeline scaling prevention cooperative resources |
| CN114074998B (en) * | 2021-11-16 | 2023-11-10 | 中国科学院城市环境研究所 | Pretreatment method and system for preventing pipeline scaling and recovering cooperative resources |
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Application publication date: 20170215 |