CN107311388A - A kind of coal ethyl glycol produces the processing method of waste water - Google Patents
A kind of coal ethyl glycol produces the processing method of waste water Download PDFInfo
- Publication number
- CN107311388A CN107311388A CN201610265030.4A CN201610265030A CN107311388A CN 107311388 A CN107311388 A CN 107311388A CN 201610265030 A CN201610265030 A CN 201610265030A CN 107311388 A CN107311388 A CN 107311388A
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- Prior art keywords
- waste water
- stripper
- ethyl glycol
- processing method
- produces
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
- C02F1/02—Treatment of water, waste water, or sewage by heating
-
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
-
- 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
- C02F3/02—Aerobic processes
-
- 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
- C02F3/28—Anaerobic digestion processes
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
The method that coal ethyl glycol produces waste water is handled the present invention relates to a kind of, is comprised the following steps:The first step, coal ethyl glycol production waste water is successively with after the water outlet of stripper tower reactor and the heating of stripper overhead steam indirect heat exchange, stripping processing is carried out into stripper;Second step, the stripper water outlet after stripping is handled carries out denitrification processing;3rd step, the pH value that denitrification is handled into water outlet is adjusted to 6.0~9.0, then carries out Aerobic Process for Treatment.In waste water after method of the present invention processing, COD can be down to below 80mg/L, and TOC can be down to below 40mg/L, and total nitrogen can be down to below 25mg/L, realize the qualified discharge of waste water.
Description
Technical field
The present invention relates to a kind of processing method of organic chemical waste water, more particularly to difficult for biological degradation
The processing method of organic chemical waste water, specifically a kind of processing coal ethyl glycol production waste water
Method.
Background technology
Ethylene glycol is a kind of important industrial chemicals and strategic materials, is that consumption figure is maximum in the world
Polyalcohol, available for manufacture polyester (can further produce terylene, beverage bottle, film), fried
Medicine, glyoxal, and antifreezing agent, plasticizer, hydraulic fluid and solvent etc. can be made.Traditional second two
Alcohol production is completely dependent on oil ethene route, and cost is high.Coal ethyl glycol technology is then with coal generation
For oil ethylene production ethylene glycol.Such technology path meets China's oil starvation, few gas, coal money
The resources characteristic of source relative abundance, with obvious economic benefit and social benefit.
Ethylene glycol is prepared by raw material of coal at present, mainly there are three process routes:
1st, direct method:With coal gasification producing synthesis gas (CO+H2), then it is straight by the step of synthesis gas one
It is bonded into ethylene glycol.The key of this technology is the selection of catalyst, considerably long in the period of in it is difficult
To realize industrialization.
2nd, olefin processes:Using coal as raw material, by obtaining synthesis gas after gasification, conversion, purification,
Through methanol-fueled CLC, methanol-to-olefins (MTO) obtain ethene, then through ethylene epoxidizing, ring
Oxidative ethane is hydrated and product purification, finally gives ethylene glycol.The process by coal-to-olefin with tradition
Petroleum path preparing ethylene glycol is combined, and technology is more ripe, but cost is of a relatively high.
3rd, oxalic acid ester process:Using coal as raw material, pass through gasification, conversion, purification and separating-purifying
After respectively obtain CO and H2, wherein CO, which is synthesized and refined by catalytic coupling, produces oxalate,
Pass through again and H2Carry out hydrogenation reaction and by obtaining polyester grade ethylene glycol (coal base second two after refining
Alcohol) process.The technological process is short, and cost is low, is that the current country attracts attention highest coal
Preparing ethylene glycol technology.
Using oxalic acid ester process production technology, will be produced by producing ethylene glycol product per ton by 0.5~1.0 ton
Hc effluent, the waste water is mainly containing dirts such as Isosorbide-5-Nitrae-dioxane (dioxanes), methanol, nitrate nitrogens
Contaminate thing, with salinity is high, difficult for biological degradation the features such as, wherein Organic Pollutants in Wastewater is main
Based on Isosorbide-5-Nitrae-dioxane (dioxanes), it is difficult to biodegradation.
The processing method for the highly concentrated production waste water that ethylene glycol is produced is produced about oxalic acid ester process at present,
It yet there are no related specific report.
The content of the invention
For defect present in prior art, coal is handled it is an object of the invention to provide one kind
Ethyl glycol it is highly concentrated production waste water method, can effectively reduce COD, TOC of waste water with
And the content of Isosorbide-5-Nitrae dioxane, realize the qualified discharge of production waste water.
The water quality of meaning coal ethyl glycol production waste water of the invention is as follows:COD is in waste water
10000~20000mg/L, TOC are 3000~6000mg/L, total nitrogen content
1500~3000mg/L, existence form is mainly with NO3Based on-N.Organic Pollutants in Wastewater is exhausted
Most of is Isosorbide-5-Nitrae-dioxane, its content 2000-7000mg/L.Waste water BOD5/CODcr
Less than 0.1, it is difficult to biodegradable.
To achieve the above objectives, the present invention is adopted the technical scheme that:
A kind of coal ethyl glycol produces the processing method of waste water, comprises the following steps:
The first step, coal ethyl glycol production waste water successively with the water outlet of stripper tower reactor and stripper tower
Push up after the heating of steam indirect heat exchange, stripping processing is carried out into stripper;
Stripper overhead steam rich in 1,4 dioxane is recyclable after indirect heat exchange is cooled down
Or burning disposal.
The bottom temperature control of stripper is 102~120 DEG C, and the number of theoretical plate control of stripper is
20~40 pieces, the tower top discharge control of stripper is into the 10~20% of tower water.Stripper
Tower top pressure be normal pressure.
Under the operating conditions described above, the content of Isosorbide-5-Nitrae dioxane can be with the water outlet of stripper tower reactor
It is reduced within 10mg/L.Above-mentioned coal ethyl glycol production waste water is entered using steam stripped method
Row processing, can reclaim the COD of waste water after most Isosorbide-5-Nitrae-dioxane, stripping in waste water
Being had with TOC largely reduces.
Second step, the production waste water (stripper water outlet) after stripping is handled is carried out at denitrification
Reason, it is therefore an objective to effectively remove the total nitrogen in stripper water outlet, in denitrification process, stripper
Nitrate nitrogen (N O in water outlet3- N) in the presence of denitrifying bacterium, it is reduced to nitrogen (N2)。
The temperature control of the denitrification processing is 20~35 DEG C, and pH value is controlled 6.0~9.0.
Isosorbide-5-Nitrae-the dioxane for being difficult to biochemistry is eliminated in first step stripping process, coal base is improved
The biodegradability of glycol production waste water, but in corresponding waste water most COD and
TOC can also be removed, and denitrifying needs are met so needing to add carbon source.The carbon source added
Methanol, every liter of coal ethyl glycol production waste water addition 2.0~5.0g methanol can be selected.
3rd step, the pH value that denitrification is handled into water outlet is adjusted to 6.0~9.0, is then carried out
Aerobic Process for Treatment.Purpose is to remove the rest COD in waste water.
The temperature control of Aerobic Process for Treatment is 18~35 DEG C, and the waste water after Aerobic Process for Treatment can be with row up to standard
Put.
A kind of coal ethyl glycol of the present invention produces the processing method of waste water, creative main
It is embodied in:The 1.4- dioxane of biochemical degradation is difficult in processing removal waste water by stripping, is carried
The high biodegradability of waste water, has ensured the smooth implementation of subsequent biochemical processing.
Beneficial effects of the present invention:
After coal ethyl glycol production waste water is using processing method of the present invention processing, waste water
In, COD can be down to below 80mg/L, and TOC can be down to below 40mg/L, and total nitrogen is down to
Below 25mg/L.
Brief description of the drawings
The present invention has drawings described below:
The schematic flow sheet of Fig. 1 present invention.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As shown in figure 1, a kind of coal ethyl glycol of the present invention produces the processing side of waste water
Method, comprises the following steps:
The first step, coal ethyl glycol production waste water successively with the water outlet of stripper tower reactor and stripper tower
Push up after the heating of steam indirect heat exchange, stripping processing is carried out into stripper;
Stripper overhead steam rich in 1,4 dioxane is recyclable after indirect heat exchange is cooled down
Or burning disposal.
The control of stripper bottom temperature is 102~120 DEG C, and the control of stripper number of theoretical plate is
20~40 pieces, the control of stripper overhead discharge is into the 10~20% of tower water.Stripper tower
Pressure on top surface is normal pressure.
Under the operating conditions described above, the content of Isosorbide-5-Nitrae dioxane can be with the water outlet of stripper tower reactor
It is reduced within 10mg/L.Above-mentioned coal ethyl glycol production waste water is entered using steam stripped method
Row processing, can reclaim the COD of waste water after most Isosorbide-5-Nitrae-dioxane, stripping in waste water
Being had with TOC largely reduces.
Second step, it is anti-that the production waste water (stripper water outlet) after stripping is handled enters denitrification
Device is answered to carry out denitrification processing, it is therefore an objective to the total nitrogen in stripper water outlet effectively to be removed, in anti-nitre
During change, nitrate nitrogen (the N O in stripper water outlet3- N) in the presence of denitrifying bacterium,
It is reduced to nitrogen (N2)。
Temperature control in denitrification reactor is 20~35 DEG C, the pH in denitrification reactor
Value control is 6.0~9.0.
Isosorbide-5-Nitrae-the dioxane for being difficult to biochemistry is eliminated in first step stripping process, coal base is improved
The biodegradability of glycol production waste water, but in corresponding waste water most COD and
TOC can also be removed, and denitrifying needs are met so needing to add carbon source.The carbon source added
Methanol, every liter of coal ethyl glycol production waste water addition 2.0~5.0g methanol can be selected.
3rd step, the pH value that denitrification is handled into water outlet is adjusted to 6.0~9.0, into aerobic
Reactor carries out Aerobic Process for Treatment.Purpose is to remove the rest COD in waste water.
Temperature control in aerobic reactor is 18~35 DEG C, the pH value control in aerobic reactor
System is 6.0~9.0.Waste water after Aerobic Process for Treatment can be with qualified discharge.
A kind of coal ethyl glycol of the present invention produces the processing method of waste water, creative main
It is embodied in:The 1.4- dioxane of biochemical degradation is difficult in processing removal waste water by stripping, is carried
The high biodegradability of waste water, has ensured the smooth implementation of subsequent biochemical processing.
Embodiment 1
Certain company's oxalic acid ester process glycol production waste water, pH value is that 2.0, COD is 14000
Mg/L, TOC are 4000mg/L.1,4- dioxane contents 5000mg/L.Total nitrogen content
2000mg/L。
Waste water production waste water is indirect with the water outlet of stripper tower reactor and stripper overhead steam successively
Enter stripper after heat exchange heating and carry out stripping processing, the stripper tower rich in Isosorbide-5-Nitrae dioxane
Pushing up steam can burning disposal after indirect heat exchange is cooled down.It is in the control of stripper bottom temperature
105 DEG C, stripper overhead Stress control be that normal pressure, stripper number of theoretical plate are 30 pieces, stripping
Under conditions of column overhead discharge is tower water 13%, Isosorbide-5-Nitrae-dioxy in stripper tower reactor water outlet
The content of six rings drops to 5mg/L.
Next, waste water is carried out into denitrification processing.The temperature control of denitrification processing is 23 DEG C,
By adjusting wastewater pH regulation water inlet, the pH in reactor is set to control 6.0~9.0.Mend
Plus methanol is added as carbon source according to every liter of waste water 3.0g methanol.
Next, the pH that denitrification is handled into water outlet is adjusted to 6~9, Aerobic Process for Treatment is carried out.
The temperature control of Aerobic Process for Treatment is 25 DEG C, and the pH in reactor is controlled 6.0~9.0.
Using prior art to analyze in waste water, COD is 70mg/L, and TOC is 20mg/L,
Total nitrogen is 18mg/L, and Isosorbide-5-Nitrae-dioxane is not detected.Realize the qualified discharge of waste water.
Embodiment 2
Certain company's coal ethyl glycol production waste water, pH value is that 1.0, COD is 20000mg/L,
TOC is 6000mg/L.Isosorbide-5-Nitrae-dioxane content 7000mg/L, total nitrogen content 3000mg/L.
Waste water production waste water is indirect with the water outlet of stripper tower reactor and stripper overhead steam successively
Enter stripper after heat exchange heating and carry out stripping processing, the stripper tower rich in Isosorbide-5-Nitrae dioxane
Top steam may be recovered after indirect heat exchange is cooled down.It is in the control of stripper bottom temperature
102 DEG C, stripper overhead Stress control be that normal pressure, stripper number of theoretical plate are 20 pieces, stripping
Under conditions of column overhead discharge is tower water 10%, Isosorbide-5-Nitrae-dioxy in stripper tower reactor water outlet
The content of six rings drops to 10mg/L.
Next, waste water is carried out into denitrification processing.The temperature control of denitrification processing is 20 DEG C,
By adjusting wastewater pH regulation water inlet, the pH in reactor is set to control 6.0~9.0.Mend
Plus methanol is added as carbon source according to every liter of waste water 5.0g methanol.
Next, the pH that denitrification is handled into water outlet is adjusted to 6.0~9.0, aerobic place is carried out
Reason.The temperature control of Aerobic Process for Treatment is 18 DEG C, and the pH in reactor is controlled 6.0~9.0.
Using prior art to analyze in waste water, COD is 80mg/L, and TOC is 40mg/L,
Total nitrogen is 25mg/L, and Isosorbide-5-Nitrae-dioxane is not detected.Realize the qualified discharge of waste water.
Embodiment 3
Certain company's coal ethyl glycol production waste water, pH value is that 2.0, COD is 10000mg/L,
TOC is 3000mg/L.Isosorbide-5-Nitrae-dioxane content 2000mg/L, total nitrogen content 1500mg/L.
Waste water production waste water is indirect with the water outlet of stripper tower reactor and stripper overhead steam successively
Enter stripper after heat exchange heating and carry out stripping processing, the stripper tower rich in Isosorbide-5-Nitrae dioxane
Top steam can carry out burning disposal after indirect heat exchange is cooled down.In the control of stripper bottom temperature
For 120 DEG C, stripper overhead Stress control be normal pressure, stripper number of theoretical plate be 40 pieces,
Under conditions of stripper overhead discharge is tower water 20%, Isosorbide-5-Nitrae in stripper tower reactor water outlet-
The content of dioxane drops to 2mg/L.
Next, waste water is carried out into denitrification processing.The temperature control of denitrification processing is 35 DEG C,
By adjusting wastewater pH regulation water inlet, the pH in reactor is set to control 6.0~9.0.Mend
Plus methanol is added as carbon source according to every liter of waste water 2.0g methanol.
Next, the pH that denitrification is handled into water outlet is adjusted to 6.0~9.0, aerobic place is carried out
Reason.The temperature control of Aerobic Process for Treatment is 35 DEG C, and the pH in reactor is controlled 6.0~9.0.
Using prior art to analyze in waste water, COD is 60mg/L, and TOC is 15mg/L,
Total nitrogen is 12mg/L, and Isosorbide-5-Nitrae-dioxane is not detected.Realize the qualified discharge of waste water.
The content not being described in detail in this specification belongs to known in professional and technical personnel in the field
Prior art.
Claims (12)
1. a kind of coal ethyl glycol produces the processing method of waste water, it is characterised in that including with
Lower step:
The first step, coal ethyl glycol production waste water successively with the water outlet of stripper tower reactor and stripper tower
Push up after the heating of steam indirect heat exchange, stripping processing is carried out into stripper;
Second step, denitrification processing, the pH value control of denitrification processing are carried out by stripper water outlet
System is 6.0~9.0;
3rd step, the pH value that denitrification is handled into water outlet is adjusted to 6.0~9.0, is then carried out
Aerobic Process for Treatment.
2. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special
Levy and be:The bottom temperature of stripper described in the first step is 102~120 DEG C, the tower of stripper
Pressure on top surface is normal pressure.
3. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special
Levy and be:The number of theoretical plate control of stripper described in the first step is 20~40 pieces.
4. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special
Levy and be:The tower top discharge control of stripper described in the first step is into tower water
10~20%.
5. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special
Levy and be:Stripper overhead steam described in the first step it is recyclable after indirect heat exchange is cooled down or
Burning disposal.
6. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special
Levy and be:After the first step is handled through stripping in the water outlet of stripper tower reactor 1,4 dioxane content
It is reduced within 10mg/L.
7. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special
Levy and be:The temperature control of the processing of denitrification described in second step is 20~35 DEG C.
8. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special
Levy and be:The processing of denitrification described in second step needs to add carbon source.
9. coal ethyl glycol as claimed in claim 8 produces the processing method of waste water, it is special
Levy and be:The carbon source is methanol.
10. coal ethyl glycol as claimed in claim 9 produces the processing method of waste water, it is special
Levy and be:The addition of the methanol is that every liter of coal ethyl glycol production waste water adds 2.0~5.0g
Methanol.
11. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special
Levy and be:The temperature of Aerobic Process for Treatment described in 3rd step is 18~35 DEG C.
12. coal ethyl glycol as claimed in claim 1 produces the processing method of waste water, it is special
Levy and be:Effluent quality after three step process is:COD is down to below 80mg/L, TOC
Below 40mg/L is down to, total nitrogen is down to below 25mg/L.
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100322947B1 (en) * | 1999-09-15 | 2002-03-13 | 이병헌 | Method for removing nitrogen in waste water |
CN102417265B (en) * | 2010-09-28 | 2013-05-01 | 中国石油化工股份有限公司 | Method for effectively removing organic matters in wastewater from nitrochlorobenzene production |
CN105084661A (en) * | 2015-08-12 | 2015-11-25 | 中石化炼化工程(集团)股份有限公司 | Coal-based ethylene glycol sewage treatment method and system |
-
2016
- 2016-04-26 CN CN201610265030.4A patent/CN107311388A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100322947B1 (en) * | 1999-09-15 | 2002-03-13 | 이병헌 | Method for removing nitrogen in waste water |
CN102417265B (en) * | 2010-09-28 | 2013-05-01 | 中国石油化工股份有限公司 | Method for effectively removing organic matters in wastewater from nitrochlorobenzene production |
CN105084661A (en) * | 2015-08-12 | 2015-11-25 | 中石化炼化工程(集团)股份有限公司 | Coal-based ethylene glycol sewage treatment method and system |
Non-Patent Citations (1)
Title |
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佟玉衡: "《实用废水处理技术》", 30 November 1998, 化学工业出版社 * |
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