CN100347106C - Treatment method for denitrogenation of waste water - Google Patents
Treatment method for denitrogenation of waste water Download PDFInfo
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- CN100347106C CN100347106C CNB200610018755XA CN200610018755A CN100347106C CN 100347106 C CN100347106 C CN 100347106C CN B200610018755X A CNB200610018755X A CN B200610018755XA CN 200610018755 A CN200610018755 A CN 200610018755A CN 100347106 C CN100347106 C CN 100347106C
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- waste water
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- ammonia nitrogen
- ammonia
- denitrogenation
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Abstract
The present invention discloses a method for denitrifying waste water, which comprises three steps of waste water pretreatment, microwave denitrifying treatment and gas collection, wherein the quality of waste water is regulated and stabilized in the step of waste water pretreatment, the pH value of the waste water is regulated to more than 10, and the pH of domestic waste water is not regulated; the microwave denitrifying treatment can make the ammonia nitrogen in the waste water escape as ammonia gas under the action of microwaves to achieve the denitrifying effect; the ammonia gas escaping in the process of microwave treatment is collected in the step of gas collection to prevent air pollution. The method has the advantages of high ammonia nitrogen removing efficiency, short treating time, low running cost, small device volume, high automation, etc. The present invention is suitable for denitrifying waste water with medium and high concentration of ammonia nitrogen, such as coking waste water, landfill leachate, fertilizers, pesticide waste water, some pharmaceutical waste water, etc., as well as domestic waste water.
Description
Technical field
The invention belongs to wastewater processing technology, be specifically related to a kind of treatment method for denitrogenation of waste water.
Technical background
Because the sharp increase and the urbanization of development of industry and agriculture, population, the sanitary sewage and the trade effluent that contain ammonia nitrogen in a large number enter natural water body, cause the eutrophication of water body, cause the excessive multiplication of algae, and the wawter bloom phenomenon takes place.Country pollutes the pollution control of nitrogen phosphorus the important content of control as regional environment in medium-term and long-term science and technology development planning.In some high-concentration ammonia nitrogenous wastewater is handled, still very difficult as the ammonia nitrogen qualified discharge of coking chemical waste water, percolate.Thereby the denitrogenation of waste water treatment technology of exploitation efficient economy is extremely important.
Present denitrogenation of waste water treatment technology mainly comprises ammonia still process method and biochemical process.The ammonia still process method steams ammonia by regulating the pH of waste water under the effect of water vapour heating.Various modified version biologic treating techniques such as A/O method, A/A/O method, A/A/O/O method, SBR method etc., the main anaerobic and aerobic residence time by appropriate design waste water, make effective generation nitrification and denitrification reaction, ammonia nitrogen is overflowed with the form of nitrogen reach the effect of denitrogenation.
The shortcoming of above-mentioned denitrogenation of waste water treatment technology is:
(1) equipment that ammonia still process method is used is huge, and the quantity of steam of consumption is big, working cost height, and when ammonia nitrogen concentration is not too high, and as less than 1000mg/L the time, this method processing waste water is very uneconomical.
(2) various A/O methods and modified version bioremediation require hydraulic detention time long (about about 30 hours), and reflux ratio is big, investment and working cost height, operation control more complicated.In a single day active sludge is impacted, and needs the long period to recover.
(3) the A/O method requires waste water to have the nutrition ratio of relatively coordinating, and when organic substrate concentration was very low, the A/O processing requirement additionally added carbon source, has increased to handle load.
(4) when waste water belongs to the difficult degradation poisonous organic wastewater, the normal growth of microorganism is suppressed, and the biochemical treatment difficulty is bigger, and denitrification effect also is affected accordingly.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art part, a kind of treatment method for denitrogenation of waste water is provided, this method has that ammonia nitrogen removal efficient height, treatment time are short, waste water adapts to advantage wide and that working cost is low.
A kind of treatment method for denitrogenation of waste water provided by the invention the steps include:
(1) Wastewater Pretreatment: to ammonia nitrogen concentration greater than 50mg/L and pH less than 10 waste water, regulate its pH value and be 10-11, to ammonia nitrogen concentration less than 50mg/L and pH less than 7.0 waste water, regulate it more than pH value to 7.0, to concentration less than 50mg/L and pH greater than 7.0 waste water, do not need to regulate pH;
(2) microwave denitrogenation processing: waste water by being filled with the microwave reactor of sensitizing agent in advance, was stopped 1-10 minute, and described sensitizing agent is gac, MnO
2Or iron filings;
(3) collection and confinement of gases: in the microwave denitrogenation processing process, water or acid are absorbed to the ammonia that is evaporated in the microwave processing process.
The invention has the advantages that:
(1) uses the microwave treatment technology, avoided the domestication process and the strict demand of biological treatment of biological treatment waste water nutrition ratio.No matter which kind of ratio COD and ammonia nitrogen are in the waste water, can directly enter microwave treatment, do not influence treatment effect.
(2) realize ammonia nitrogen remove and reclaim carry out synchronously, absorb the recycling that water behind the ammonia or acid can be carried out ammonia.
(3) at the middle and high concentration ammonia nitrogen waste water, after microwave denitrogenation processing, the nutrition of waste water for favourable condition has been created in follow-up biological treatment, uses conventional biological treatment normally to move than recovering normal.
(4) for sanitary sewage, directly carry out microwave denitrogenation processing, ammonia nitrogen gets final product qualified discharge.
Embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing.
Treatment method for denitrogenation of waste water provided by the invention comprises Wastewater Pretreatment, microwave denitrogenation processing and three steps of collection and confinement of gases.Wastewater Pretreatment is used for regulating and stable waste water quality, regulates more than the pH value to 10 of waste water.When ammonia nitrogen concentration does not need to regulate pH less than 50mg/L and pH greater than 7 sanitary sewage and trade effluent.Microwave denitrogenation processing is that waste water is passed through microwave reactor with certain flow velocity, is filled with sensitizing agent in the microwave reactor in advance, as gac, MnO
2And iron filings, sensitizing agent can form the high temperature dot position on the surface under microwave irradiation effect, and in the process of waste water with the contact of sensitizing agent surface, the ammonia nitrogen that it the contained effusion of can volatilizing reaches the effect of denitrogenation.Collection and confinement of gases is to collect the ammonia of overflowing from waste water in the microwave processing process, avoids topsoil.Be further detailed explanation to each step respectively below:
(1) adjusting is stable: regulating pondage, balanced water quality.Less than 10 waste water, adding alkali (the 5%-20%NaOH aqueous solution), to regulate the pH of waste water be 10-11 to concentration greater than 50mg/L and pH; Concentration greater than 7.0 waste water, does not need to regulate pH less than 50mg/L and pH; Concentration, adds alkali (the 5%-20%NaOH aqueous solution) and regulates pH greater than 7.0 less than 7.0 waste water less than 50mg/L and pH.
(2) microwave treatment: with waste water by being filled with sensitizing agent (gac, MnO in advance
2And iron filings) microwave reactor, stopped 1-10 minute, in the microwave reactor, sensitizing agent can form many high temperature dots position on the surface under microwave irradiation effect, in the process of waste water with the high temperature dot position contact on sensitizing agent surface, multiple physical-chemical reaction can take place, the ammonia nitrogen in the waste water is overflowed with the form of ammonia, reach the effect of denitrogenation.
(3) collection and confinement of gases: water or acid are absorbed the ammonia that is evaporated in the microwave processing process, avoid secondary pollution, can realize the recycling of ammonia simultaneously.
Embodiment 1, and coking chemical waste water is considered to the higher unmanageable trade effluent of ammonia nitrogen concentration.Use the pH regulator to 10 of alkali (sodium hydroxide) earlier, put into microwave reactor radiotreatment 3min waste water.Be filled with Microwave Senstizer in the microwave reactor in advance (as MnO
2), under microwave irradiation effect, the sensitizing agent surface can form a lot of high temperature hotspot, and in the process of waste water with the contact of sensitizing agent surface, ammonia nitrogen at high temperature can be evaporated effusion.The back detection waste water quality that finishes finds that when wastewater pH was adjusted to 9.0, ammonia nitrogen concentration was reduced to 45mg/L by initial 380mg/L; When wastewater pH was adjusted to 11, the water outlet ammonia nitrogen concentration reached first discharge standard less than 10mg/L.
Embodiment 2, are the city domestic sewage of 18.7mg/L to ammonia nitrogen concentration, and pH does not regulate pH about 8.0, put into the microwave reactor that is filled with sensitizing agent in advance.Direct microwave radiation 2min, ammonia nitrogen concentration is reduced to 6.3min; During radiation 3min, ammonia nitrogen concentration is reduced to 1.8min.
Claims (1)
1, a kind of treatment method for denitrogenation of waste water the steps include:
(1) Wastewater Pretreatment: to ammonia nitrogen concentration greater than 50mg/L and pH less than 10 waste water, regulate its pH value and be 10-11, to ammonia nitrogen concentration less than 50mg/L and pH greater than 7.0 waste water, do not need to regulate pH, to ammonia nitrogen concentration less than 50mg/L and pH less than 7.0 waste water, regulate it more than pH value to 7.0;
(2) microwave denitrogenation processing: waste water by being filled with the microwave reactor of sensitizing agent in advance, was stopped 1-10 minute, and described sensitizing agent is gac, MnO
2Or iron filings;
(3) collection and confinement of gases: in the microwave denitrogenation processing process, water or acid are absorbed to the ammonia that is evaporated in the microwave processing process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610018755XA CN100347106C (en) | 2006-04-12 | 2006-04-12 | Treatment method for denitrogenation of waste water |
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| CNB200610018755XA CN100347106C (en) | 2006-04-12 | 2006-04-12 | Treatment method for denitrogenation of waste water |
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| Publication Number | Publication Date |
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| CN1837073A CN1837073A (en) | 2006-09-27 |
| CN100347106C true CN100347106C (en) | 2007-11-07 |
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| CNB200610018755XA Expired - Fee Related CN100347106C (en) | 2006-04-12 | 2006-04-12 | Treatment method for denitrogenation of waste water |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101337750B (en) * | 2008-08-08 | 2010-04-14 | 浙江开创环保科技有限公司 | Reclamation and comprehensive treatment method for paper-making waste water |
| CN101781048B (en) * | 2009-10-20 | 2012-08-22 | 北京林业大学 | Low ammonia nitrogen waste water treatment and recycling method |
| CN102001721B (en) * | 2010-10-25 | 2013-03-20 | 湘潭大学 | Method for treating ammonia nitrogen wastewater |
| CN103145262B (en) * | 2013-01-11 | 2014-12-24 | 中国环境科学研究院 | Method and system of sewage treatment and resource recovery |
| CN104591331B (en) * | 2013-10-30 | 2018-04-20 | 南京源泉环保科技股份有限公司 | A kind of method of ammonia nitrogen in removal electroplating wastewater |
| CN109942121A (en) * | 2018-12-27 | 2019-06-28 | 青岛海永顺新能源科技有限公司 | A kind of waste water of heat-engine plant nitrogen rejection facility and its application method |
| CN111517539B (en) * | 2020-04-02 | 2022-08-05 | 中广核环保产业有限公司 | Treatment method of high-concentration high-ammonia nitrogen organic sewage |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1562775A (en) * | 2004-04-15 | 2005-01-12 | 大连理工大学 | Restoring method of activated carbon for decomposing, processing and adsorbing organic substance in waste water through microwave irradiation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1562775A (en) * | 2004-04-15 | 2005-01-12 | 大连理工大学 | Restoring method of activated carbon for decomposing, processing and adsorbing organic substance in waste water through microwave irradiation |
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