CN105668674A - Device and method for lowering content of COD and ammonia nitrogen in wastewater through negative pressure blowoff - Google Patents
Device and method for lowering content of COD and ammonia nitrogen in wastewater through negative pressure blowoff Download PDFInfo
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- CN105668674A CN105668674A CN201610150264.4A CN201610150264A CN105668674A CN 105668674 A CN105668674 A CN 105668674A CN 201610150264 A CN201610150264 A CN 201610150264A CN 105668674 A CN105668674 A CN 105668674A
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- ammonia
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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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- 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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention relates to a device and method for lowering the content of COD and ammonia nitrogen in wastewater through negative pressure blowoff. The device comprises a reaction kettle, a vacuum buffer tank and a water-jet vacuum pump. Wastewater is conveyed into the reaction kettle, one side of the top of the reaction kettle is provided with a manhole, caustic soda flakes are placed into the reaction kettle through the manhole, a stirrer is arranged in the reaction kettle and conveys power through a motor installed on the top of the reaction kettle, a kettle bottom valve is arranged at the bottom of the reaction kettle and connected with an air inlet pipe through an air inlet valve and connected to a sewage treatment connecting pipe through a liquid outlet valve, the reaction kettle is connected with vacuum buffer tank through a connecting pipe, and the vacuum buffer tank is connected with the water-jet vacuum pump through a pipeline. The device has the advantages that the negative pressure blowoff way is adopted creatively, the method is more ideal in blowoff effect, ammonia molecules separated from the liquid can be brought away in time, low-boiling methyl alcohol and other solvents can be brought away, COD is lowered, meanwhile, the content of ammonia nitrogen is lowered, and the removal rate of ammonia nitrogen exceeds 90%.
Description
Technical field
The present invention relates to the production technique of a kind of Sucralose, reduce the device and method of COD and ammonia-nitrogen content in waste water in particular to a kind of negative pressure stripping.
Background technology
The production process of Sucralose produces the waste water of a large amount of high COD and high ammonia-nitrogen content, COD content about 5000 is to 50000mg/L, ammonia-nitrogen content about 300 is to 1800mg/L, the organic solvent methyl alcohol of trace, ethyl acetate, dimethyl formamide, TERTIARY BUTYL AMINE and inorganics ammoniacal liquor etc. are all the reasons causing waste water height COD and high ammonia-nitrogen content, this strand of waste water needed to reduce ammonia-nitrogen content to below 100mg/L before entering waste disposal plant, otherwise it is abnormal that waste disposal plant can be caused to run, regulation according to " GB18918-2002 urban wastewater treatment firm pollutant emission standard ", COD emission standard is 100mg/L, the nitrogen discharged standard of ammonia is 25mg/L,
But, traditional stripping adopts the mode of gas blower air blast by force, and experiment effect is undesirable, stripping length consuming time, reduces COD content not obvious.
Summary of the invention
The object of the present invention is exactly in view of the foregoing defects the prior art has, it is provided that a kind of negative pressure stripping reduces the device and method of COD and ammonia-nitrogen content in waste water, reaches the preliminary object reducing COD and ammonia-nitrogen content by the process of stripping in advance.
A kind of negative pressure stripping that the present invention mentions reduces COD and ammonia-nitrogen content device in waste water, comprise reactor, vacuum buffer tank, water-jet pump, waste water delivers in reactor by the top of waste water inlet pipe and reactor, the top side of reactor is provided with manhole, sheet alkali is put into by manhole, agitator it is provided with in reactor, the motor transmitting power that agitator is installed by reactor top, it is provided with bottom valve in the bottom of reactor, and connect air intlet pipe by intake valve, it is connected to sewage disposal pipe connecting by liquid-outlet valve; Described reactor is by pipe connecting and vacuum buffer tank, and vacuum buffer tank is connected with water-jet pump by pipeline.
Above-mentioned water-jet pump is carried by water shoot, and with hydrochloric acid neutralization, then enters triple effect evaporation system de-except ammonium chloride.
A kind of negative pressure stripping that the present invention mentions reduces the method for COD and ammonia-nitrogen content device in waste water, comprises the following steps and makes:
1) adding waste water in reactor, COD measures, and ammonia-nitrogen content is measured, and is added by sodium hydroxide in reactor, opens vacuum stripping device, sampling and measuring pH after for some time > 12;
2) temperature remains between 50-60 DEG C, and negative pressure remains on-0.015MPa to-0.030MPa, negative pressure inlet stripping 6 hours;
3) sample, with in the vitriol oil and sample to pH=6 to 8, measure COD and ammonia-nitrogen content, ammonia-nitrogen content be less than 100mg/L be qualified, if defective continuation stripping, to detect qualified, if qualified, stop vacuum pump;
4) open stirring, slowly drip and add between the vitriol oil to pH=6-8;
5) again measure COD content and ammonia-nitrogen content, by pump delivery to waste disposal plant after qualified, calculate the decreasing ratio of COD and ammonia nitrogen respectively.
In addition, the water in the water tank of water-jet pump (3) regularly discharges, and with hydrochloric acid neutralization, then enters triple effect evaporation system de-except ammonium chloride, and three effect distilled water, still containing a small amount of ammonia nitrogen, continue to enter reactor negative pressure stripping.
The invention has the beneficial effects as follows: the mode of the employing negative pressure stripping of initiative of the present invention, the method stripping effect is more desirable, the amino molecule departing from liquid can be pulled away timely, and lower boiling methyl alcohol equal solvent can be pulled away, and reduces ammonia-nitrogen content while reducing COD; Present method, summing up on the basis repeatedly tested, have found suitable time, temperature, pressure and pH value, and ammonia nitrogen removal frank is more than 90%.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of the present invention;
In upper figure: reactor 1, vacuum buffer tank 2, water-jet pump 3, waste water inlet pipe a, air intlet pipe b, water shoot c, sewage disposal pipe connecting d; Motor 1.1, agitator 1.2, survey meter 1.3, bottom valve 1.4, intake valve 1.5, liquid-outlet valve 1.6, manhole 1.7, sheet alkali 1.8, pipe connecting 1.9.
Embodiment
Embodiment 1: by reference to the accompanying drawings 1, the invention will be further described:
A kind of negative pressure stripping that the present invention mentions reduces COD and ammonia-nitrogen content device in waste water, comprise reactor 1, vacuum buffer tank 2, water-jet pump 3, waste water delivers in reactor 1 by the top of waste water inlet pipe a and reactor 1, the top side of reactor 1 is provided with manhole 1.7, sheet alkali 1.8 is put into by manhole 1.7, agitator 1.2 it is provided with in reactor 1, motor 1.1 transmitting power that agitator 1.2 is installed by reactor 1 top, it is provided with bottom valve 1.4 in the bottom of reactor 1, and connect air intlet pipe b by intake valve 1.5, it is connected to sewage disposal pipe connecting d by liquid-outlet valve 1.6, described reactor 1 is by pipe connecting 1.9 and vacuum buffer tank 2, and vacuum buffer tank 2 is connected with water-jet pump 3 by pipeline.
Above-mentioned water-jet pump 3 is carried by water shoot c, and with hydrochloric acid neutralization, then enters triple effect evaporation system de-except ammonium chloride.
A kind of negative pressure stripping that the present invention mentions reduces the method for COD and ammonia-nitrogen content device in waste water, comprises the following steps and makes:
1 adds waste water in reactor, and COD measures, and ammonia-nitrogen content is measured, and is added by sodium hydroxide in reactor, opens vacuum stripping device, sampling and measuring pH after for some time > 12;
2 temperature remain between 50-60 DEG C, and negative pressure remains on-0.015MPa to-0.030MPa, negative pressure inlet stripping 6 hours;
3 samplings, with in the vitriol oil and sample to pH=6 to 8, measure COD and ammonia-nitrogen content, ammonia-nitrogen content be less than 100mg/L be qualified, if defective continuation stripping, to detect qualified, if qualified, stop vacuum pump;
4 open stirring, slowly drip and add between the vitriol oil to pH=6-8;
5 measure COD content and ammonia-nitrogen content again, by pump delivery to waste disposal plant after qualified, calculate the decreasing ratio of COD and ammonia nitrogen respectively.
In addition, the water in the water tank of water-jet pump 3 regularly discharges, and with hydrochloric acid neutralization, then enters triple effect evaporation system de-except ammonium chloride, and three effect distilled water, still containing a small amount of ammonia nitrogen, continue to enter reactor negative pressure stripping.
The mode of the employing negative pressure stripping of initiative of the present invention, the method stripping effect is more desirable. The amino molecule departing from liquid can be pulled away timely, and lower boiling methyl alcohol equal solvent can be pulled away, and reduces ammonia-nitrogen content while reducing COD.
Ammonia-nitrogen desorption meets First order dynamic model
Ct=C0e-KTOr ln (Ct/C0)=-KT
CtAnd C0It is respectively t and the ammonia nitrogen concentration in initial moment, mg/L; K is overall mass transfer coefficient, h-1; T is time h.
There is NH in the liquid phase4 +And NH3Balance
NH4 ++OH-=NH3+H2O
Equilibrium constant KhTemperature influence.
The factor affecting ammonia-nitrogen desorption technique has 3 in theory: time, temperature, pH value.
Present method, summing up on the basis repeatedly tested, have found suitable time, temperature, pressure and pH value, and ammonia nitrogen removal frank is more than 90%.
Embodiment 2: a kind of negative pressure stripping that the present invention mentions reduces the method for COD and ammonia-nitrogen content device in waste water, comprises the following steps and makes:
1) adding the waste water of 687 grams in reactor, water is from extraction wastewater distilled water, and its COD value is 8578mg/L, and ammonia values of nitrogen might is 312.97mg/L, adds 6.92 grams of sheet alkali, opens vacuum pump and carries out negative pressure inlet stripping, and bath temperature controls at 50 DEG C. Vacuum cavitations is at-0.015MPa to-0.030MPa.
2) negative pressure stripping stops for 5 hours
3) slow adds vitriol oil adjust ph is 6 to 8
4) COD and ammonia values of nitrogen might is measured.
COD records 3837.5mg/L, COD clearance=(8578-3837.5)/8578=55.26%
Ammonia nitrogen records 79.14mg/L, ammonia nitrogen removal frank=(312.97-79.14)/312.97=74.71%
Embodiment 3: a kind of negative pressure stripping that the present invention mentions reduces the method for COD and ammonia-nitrogen content device in waste water, comprises the following steps and makes:
1) adding the waste water of 462 grams in reactor, water is from extraction wastewater distilled water, and its COD value is 8578mg/L, and ammonia values of nitrogen might is 312.97mg/L, adds 5.18 grams of sheet alkali, opens vacuum pump and carries out negative pressure inlet stripping, and bath temperature controls at 50 DEG C. Vacuum cavitations is at-0.015MPa to-0.020MPa.
2) negative pressure stripping stops for 6 hours
3) slow adds vitriol oil adjust ph is 6 to 8
4) COD and ammonia values of nitrogen might is measured.
COD records 5267mg/L, COD clearance=(8578-5267)/8578=38.60%
Ammonia nitrogen records 22.02mg/L, ammonia nitrogen removal frank=(312.97-22.02)/312.97=92.96%
Embodiment 4: a kind of negative pressure stripping that the present invention mentions reduces the method for COD and ammonia-nitrogen content device in waste water, comprises the following steps and makes:
1) adding the waste water of 587 grams in reactor, water carrys out DMF rectifying tower backflow water, and its COD value is 9431mg/L, and ammonia values of nitrogen might is 1658.09mg/L, adds 6.05 grams of sheet alkali, opens vacuum pump and carries out negative pressure inlet stripping, and bath temperature controls at 50 DEG C.Vacuum cavitations arrives-0.030MPa(gauge pressure at-0.025MPa).
2) negative pressure stripping stops for 5.5 hours
3) slow adds vitriol oil adjust ph is 6
4) COD and ammonia values of nitrogen might is measured.
COD records 3522mg/L, COD clearance=(9431-3522)/9431=62.66%
Ammonia nitrogen records 47.38mg/L, ammonia nitrogen removal frank=(1658.09-47.38)/1658.09=97.14%
Embodiment 5: a kind of negative pressure stripping that the present invention mentions reduces the method for COD and ammonia-nitrogen content device in waste water, comprises the following steps and makes:
1) adding the waste water of 586 grams in reactor, water carrys out DMF rectifying tower backflow water, and its COD value is 9431mg/L, and ammonia values of nitrogen might is 1658.09mg/L, adds 4.04 grams of sheet alkali, opens vacuum pump and carries out negative pressure inlet stripping, and bath temperature controls at 50 DEG C. Vacuum cavitations arrives-0.030MPa(gauge pressure at-0.025MPa).
2) negative pressure stripping stops for 3.5 hours
3) slow adds vitriol oil adjust ph is 7
4) COD and ammonia values of nitrogen might is measured.
COD records 7796mg/L, COD clearance=(9431-7796)/9431=17.33%
Ammonia nitrogen records 143.24mg/L, ammonia nitrogen removal frank=(1658.09-143.24)/1658.09=91.36%
In addition, for the waste water (ammonia-nitrogen content is between 1000mg/L to 1800mg/L) of the high ammonia-nitrogen content produced in dimethyl formamide process, its operation steps is:
1, closing bottom valve, delivered into by waste water in reactor, volume 5m3, is as the criterion with meter readings;
2, go out to drop into the sheet alkali (NaOH) of 50 kilograms from manhole, open and stir 20 minutes, then stop stirring;
3, still is airtight, opens vacuum system, slowly opens bottom valve and air intake valve simultaneously, makes air enter reactor and carry out stripping effect, is between-0.02MPa to-0.03MPa by pressure in the aperture control still of control intake valve;
4, open steam heating, make temperature in the kettle remain on 50 DEG C;
5, stripping closes intake valve after 4 hours, closes vacuum pump, emptying; By Liquid transfer in still to equalizing tank, slowly adding vitriol oil adjust ph is that 7. measurement ammonia-nitrogen contents are less than 100mg/L, enters wastewater treatment process;
6, the water in vacuum pump water tank regularly discharges, and with hydrochloric acid neutralization, then enters triple effect evaporation system de-except ammonium chloride, and three effect distilled water, still containing a small amount of ammonia nitrogen, continue to enter reactor negative pressure stripping.
The above is only the better embodiment of part of the present invention, and any those of ordinary skill in the art all may utilize the technical scheme of above-mentioned elaboration to be revised or be revised as equivalent technical scheme. Therefore, any simple modification carried out according to the technical scheme of the present invention or equivalent displacement, belong to the greatest extent the scope of protection of present invention.
Claims (4)
1. a negative pressure stripping reduces COD and ammonia-nitrogen content device in waste water, it is characterized in that: comprise reactor (1), vacuum buffer tank (2), water-jet pump (3), waste water delivers in reactor (1) by the top of waste water inlet pipe (a) He reactor (1), the top side of reactor (1) is provided with manhole (1.7), sheet alkali (1.8) is put into by manhole (1.7), agitator (1.2) it is provided with in reactor (1), motor (1.1) transmitting power that agitator (1.2) is installed by reactor (1) top, it is provided with bottom valve (1.4) in the bottom of reactor (1), and connect air intlet pipe (b) by intake valve (1.5), it is connected to sewage disposal pipe connecting (d) by liquid-outlet valve (1.6),Described reactor (1) is by pipe connecting (1.9) and vacuum buffer tank (2), and vacuum buffer tank (2) is connected with water-jet pump (3) by pipeline.
2. negative pressure stripping according to claim 1 reduces COD and ammonia-nitrogen content device in waste water, it is characterized in that: described water-jet pump (3) is by water shoot (c) conveying, and with hydrochloric acid neutralization, then enters triple effect evaporation system de-except ammonium chloride.
3. negative pressure stripping as claimed in claim 1 or 2 reduces a method for COD and ammonia-nitrogen content device in waste water, it is characterized in that, comprises the following steps and make:
1) adding waste water in reactor, COD measures, and ammonia-nitrogen content is measured, and is added by sodium hydroxide in reactor, opens vacuum stripping device, sampling and measuring pH after for some time > 12;
2) temperature remains between 50-60 DEG C, and negative pressure remains on-0.015MPa to-0.030MPa, negative pressure inlet stripping 6 hours;
3) sample, with in the vitriol oil and sample to pH=6 to 8, measure COD and ammonia-nitrogen content, ammonia-nitrogen content be less than 100mg/L be qualified, if defective continuation stripping, to detect qualified, if qualified, stop vacuum pump;
4) open stirring, slowly drip and add between the vitriol oil to pH=6-8;
5) again measure COD content and ammonia-nitrogen content, by pump delivery to waste disposal plant after qualified, calculate the decreasing ratio of COD and ammonia nitrogen respectively.
4. negative pressure stripping according to claim 3 reduces the method for COD and ammonia-nitrogen content device in waste water, it is characterized in that, water in the water tank of water-jet pump (3) regularly discharges, neutralize with hydrochloric acid, then triple effect evaporation system is entered de-except ammonium chloride, three effect distilled water, still containing a small amount of ammonia nitrogen, continue to enter reactor negative pressure stripping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610150264.4A CN105668674A (en) | 2016-03-16 | 2016-03-16 | Device and method for lowering content of COD and ammonia nitrogen in wastewater through negative pressure blowoff |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610150264.4A CN105668674A (en) | 2016-03-16 | 2016-03-16 | Device and method for lowering content of COD and ammonia nitrogen in wastewater through negative pressure blowoff |
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| CN105668674A true CN105668674A (en) | 2016-06-15 |
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| CN201610150264.4A Pending CN105668674A (en) | 2016-03-16 | 2016-03-16 | Device and method for lowering content of COD and ammonia nitrogen in wastewater through negative pressure blowoff |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132151A (en) * | 2017-06-22 | 2017-09-05 | 北京建筑大学 | A kind of device for determining vacuum distillation fracturing outlet liquid steam COD value |
| CN110963507A (en) * | 2019-12-30 | 2020-04-07 | 北京华电光大环境股份有限公司 | Ammonia water ammonia production system and process for coke oven flue gas denitration |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4093544A (en) * | 1975-02-05 | 1978-06-06 | Sterling Drug, Inc. | Method and apparatus for ammonia-nitrogen removal by vacuum desorption |
| CN1872707A (en) * | 2006-06-15 | 2006-12-06 | 武汉理工大学 | Removal method and equipment for sucking ammonia nitrogen in waste water through negative pressure of vacuum |
| CN102897957A (en) * | 2012-10-30 | 2013-01-30 | 黄立维 | Method for purifying harmful substances in wastewater and special device thereof |
| CN203360204U (en) * | 2013-07-03 | 2013-12-25 | 新疆石河子中发化工有限责任公司 | Pretreatment device for reducing COD of chlorine vinegar resin mother solution water by suspension method |
-
2016
- 2016-03-16 CN CN201610150264.4A patent/CN105668674A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4093544A (en) * | 1975-02-05 | 1978-06-06 | Sterling Drug, Inc. | Method and apparatus for ammonia-nitrogen removal by vacuum desorption |
| CN1872707A (en) * | 2006-06-15 | 2006-12-06 | 武汉理工大学 | Removal method and equipment for sucking ammonia nitrogen in waste water through negative pressure of vacuum |
| CN102897957A (en) * | 2012-10-30 | 2013-01-30 | 黄立维 | Method for purifying harmful substances in wastewater and special device thereof |
| CN203360204U (en) * | 2013-07-03 | 2013-12-25 | 新疆石河子中发化工有限责任公司 | Pretreatment device for reducing COD of chlorine vinegar resin mother solution water by suspension method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107132151A (en) * | 2017-06-22 | 2017-09-05 | 北京建筑大学 | A kind of device for determining vacuum distillation fracturing outlet liquid steam COD value |
| CN110963507A (en) * | 2019-12-30 | 2020-04-07 | 北京华电光大环境股份有限公司 | Ammonia water ammonia production system and process for coke oven flue gas denitration |
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