CN103304028A - Nitrogen stirring method for anaerobic treatment - Google Patents

Nitrogen stirring method for anaerobic treatment Download PDF

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Publication number
CN103304028A
CN103304028A CN2013102599075A CN201310259907A CN103304028A CN 103304028 A CN103304028 A CN 103304028A CN 2013102599075 A CN2013102599075 A CN 2013102599075A CN 201310259907 A CN201310259907 A CN 201310259907A CN 103304028 A CN103304028 A CN 103304028A
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China
Prior art keywords
aeration
stirring
nitrogen gas
anaerobic treatment
nitrogen
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CN2013102599075A
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Chinese (zh)
Inventor
韩洪军
徐鹏
贾胜勇
侯保林
赵茜
庄海峰
方芳
张凌翰
徐春艳
唐安琪
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Harbin Institute of Technology
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Harbin Institute of Technology
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Priority to CN2013102599075A priority Critical patent/CN103304028A/en
Publication of CN103304028A publication Critical patent/CN103304028A/en
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    • Y02W10/12

Abstract

The invention discloses a nitrogen stirring method for anaerobic treatment, relating to an anaerobic stirring method and solving the problems of poor stirring effect and damage on an anaerobic treatment system in an existing anaerobic stirring method. The method comprises the following steps of: 1, arranging a nitrogen stirring system at the bottom of a reactor; and 2, introducing nitrogen and stirring. According to the method, the stirring operation is uniform, and dissolved gases such as dissolved oxygen, H2, free ammonia, H2S and CO2 and part of volatile organic compounds in a solution can be blown off while the stirring process is proceeded, therefore, double effects of guaranteeing a good anaerobic treatment environment and reducing a treatment load can be achieved. The nitrogen stirring method is used for nitrogen stirring in anaerobic treatment.

Description

A kind of nitrogen gas stirring method of anaerobic treatment
Technical field
The present invention relates to the anaerobism stirring means.
Background technology
Anaerobic biological treatment has the many merits such as energy consumption is low, organic loading is high, bioenergy, at present to the processing of difficult degradation or high concentrated organic wastewater, and usually all can be with the anaerobic treatment process as an important biological treatment stage.
For anaerobic biological treatment, the modes that adopt anaerobic effluent to reflux increase the purpose that the interior upflow velocity of reactor reaches stirring more at present.But the concurrent state of recirculation water and water inlet often causes mixed effect not good, and since the recirculation water dissolved oxygen bring the rising that causes the reactor redox potential into, anaerobic system is worked the mischief.Part Study personnel adopt the anaerobic methane return stirring, though can reach the purpose of stirring, can cause H 2S, H 2, CO 2Deng reentering reactive system, cause inevitable harm.
Summary of the invention
The present invention will solve existing anaerobism stirring means and exist mixing effect not good, the problem that system for anaerobic treatment is worked the mischief, and a kind of nitrogen gas stirring method of anaerobic treatment is provided.
A kind of nitrogen gas stirring method of anaerobic treatment, specifically carry out according to following steps:
One, the nitrogen gas stirring system is arranged on reactor bottom, wherein the nitrogen gas stirring system is comprised of aeration house steward, aeration branch pipe and aeration plate, and wherein aeration branch pipe is communicated with the aeration house steward, and at aeration branch pipe aeration plate is set;
Two, nitrogen is passed into the aeration house steward, then enter aeration branch pipe, enter in mud in the reactor, the water mixed liquid by the aeration plate aeration, nitrogen rises to liquid level and overflows, and finishes the nitrogen gas stirring method of anaerobic treatment.
Wherein, the aeration plate of different pore size size is set at reactor bottom arranged on left and right sides aeration branch pipe in the step 1, makes to form the convolution stream mode in the system, be conducive to form anaerobic grain sludge.
Nitrogen of the present invention rises to the effect that liquid level and effusion system play stirring from reactor bottom, mud, water is fully mixed, and make dissolved oxygen, H 2, free ammonia, H 2S, CO 2Deng gas dissolved and part volatile organic matter detachment system.The minimizing of dissolved oxygen can reduce the redox potential of system, the anaerobic environment of safeguards system.H 2Minimizing then so that in the system hydrogen dividing potential drop be minimized, low hydrogen dividing potential drop environment is conducive to the carrying out of acetic acid type fermentation, avoids because the butyric acid that high hydrogen dividing potential drop causes or propionic acid type fermentation cause anaerobic system that the serious phenomenon of becoming sour occurs.The stripping of free ammonia can not only reduce free ammonia to the restraining effect of methanogen, and makes the balanced reaction in the dissolving Be broken, reaction is carried out left, thereby reduce the NH in the solution 4 +Concentration.Equally, H 2S and CO 2Ionization equilibrium Also can be broken along with the stripping of the two, not only alleviate S in the solution 2-To the harm of methanogen, and because H +Consumption slow down the speed that anaerobic system PH reduces.
The invention has the beneficial effects as follows:
One, stir with effluent recycling and compare with mechanical stirring, nitrogen gas stirring not only makes mud, water mixed effect better, can also avoid bringing into because of dissolved oxygen system is worked the mischief;
Two, compare with the stirring of backflow biogas, nitrogen can not react with solution as a kind of rare gas element, has avoided the pollutent in the backflow biogas to reenter system and cause secondary pollution;
Three, according to Henry's law, because passing into of nitrogen causes the reduction of each partial pressure in the system, thereby make dissolved oxygen, H in the mixed solution 2, free ammonia, H 2S, CO 2Reduce Deng gas dissolved and part volatile organic matter concentration, reach the double effects that guarantees good anaerobic treatment environment and reduce the processing load.
The present invention is used for the nitrogen gas stirring of anaerobic treatment.
Description of drawings
Fig. 1 is nitrogen gas stirring system schematic among the present invention.
Embodiment
Technical solution of the present invention is not limited to following cited embodiment, also comprises the arbitrary combination between each embodiment.
Embodiment one: the nitrogen gas stirring method of a kind of anaerobic treatment of present embodiment, specifically carry out according to following steps:
One, the nitrogen gas stirring system is arranged on reactor 4 bottoms, wherein the nitrogen gas stirring system is comprised of aeration house steward 1, aeration branch pipe 2 and aeration plate 3, and wherein aeration branch pipe 2 is communicated with aeration house steward 1, and at aeration branch pipe 2 aeration plate 3 is set;
Two, nitrogen is passed into aeration house steward 1, then enter aeration branch pipe 2, enter in mud in the reactor 4, the water mixed liquid by aeration plate 3 aerations, nitrogen rises to liquid level and overflows, and finishes the nitrogen gas stirring method of anaerobic treatment.
The beneficial effect of present embodiment is: stir with effluent recycling and compare with mechanical stirring, nitrogen gas stirring not only makes mud, water mixed effect better, can also avoid bringing into because of dissolved oxygen system is worked the mischief; Compare with the stirring of backflow biogas, nitrogen can not react with solution as a kind of rare gas element, avoids biogas to stir the secondary pollution that brings; According to Henry's law, because passing into of nitrogen causes the reduction of each partial pressure in the system, thereby make dissolved oxygen, H in the mixed solution 2, free ammonia, H 2S, CO 2Reduce Deng gas dissolved and part volatile organic matter concentration, reach the double effects that guarantees good anaerobic treatment environment and reduce the processing load.
Embodiment two: what present embodiment and embodiment one were different is: aeration plate 3 evenly is laid in reactor 4 bottoms in the step 1.Other is identical with embodiment one.
Embodiment three: what present embodiment and embodiment one were different is: aeration plate 3 is microporous aeration discs in the step 1, and the aperture is 0.2mm~0.5mm.Other is identical with embodiment one.
Embodiment four: what present embodiment and embodiment one were different is: the total area of aeration plate 3 is 5%~15% of reactor 4 effective floorages in the step 1.Other is identical with embodiment one.
Embodiment five: what present embodiment and embodiment one were different is: aeration mode is continuous aeration in the step 2.Other is identical with embodiment one.
Embodiment six: what present embodiment and embodiment one were different is: in the step 2 among the aeration house steward 1 per hour nitrogen flow be 2%~10% of reactor 4 useful volumes, and nitrogen gas purity is greater than 99%.Other is identical with embodiment one.
Embodiment seven: what present embodiment was different from one of embodiment one to six is: the useful volume of reactor 4 is 10L in the step 2, and nitrogen flow is 0.2L/h among the aeration house steward 1.Other is identical with one of embodiment one to six.
Adopt following examples to verify beneficial effect of the present invention:
Embodiment one:
The nitrogen gas stirring method of a kind of anaerobic treatment of the present embodiment, specifically carry out according to following steps:
One, the nitrogen gas stirring system is arranged on reactor 4 bottoms, wherein the nitrogen gas stirring system is comprised of aeration house steward 1, aeration branch pipe 2 and aeration plate 3, and wherein aeration branch pipe 2 is communicated with aeration house steward 1, and connects aeration plate 3 at aeration branch pipe 2;
Two, nitrogen is passed into aeration house steward 1, then enter aeration branch pipe 2, enter in mud in the reactor 4, the water mixed liquid by aeration plate 3 aerations, nitrogen rises to liquid level and overflows, and finishes the nitrogen gas stirring method of anaerobic treatment.
Wherein the useful volume of reactor 4 is 10L in the present embodiment, and reactor 4 bed-plate dimensions are 20cm * 20cm, and the area of single aeration plate 3 is 10cm 2, the aperture is 0.2mm, at aeration branch pipe 24 aeration plates 3 is set; Nitrogen flow is 0.2L/h among the aeration house steward 1.
The present embodiment is compared with other alr mode and is seen the following form:
Under the present embodiment, the redox potential in the system for anaerobic treatment is-307mV, is starkly lower than the redox potential under other three kinds of alr modes, guaranteed the anaerobic environment that reactor is strict.Free ammonia and hydrogen dividing potential drop in the reactor have obvious reduction.Under the present embodiment, the concentration of free ammonia in the reactor is 7.9mg/L, and same effluent recycling, biogas stir and compares with mechanical stirring, have reduced respectively 17.7%, 31.9% and 23.3%; Hydrogen dividing potential drop 1.7 * 10 in the reactor -4Atm, 4.2 * 10 when stirring with biogas -4Atm has compared obvious reduction.The ratio of acetic acid in system's volatile acid (acetic acid+propionic acid+butyric acid) be up to 73.6%, compares with other three kinds of alr modes to increase significantly.Show that intrasystem fermented type is mainly take the acetic acid type fermentation as main.Nitrogen can not react with solution as a kind of rare gas element, can avoid biogas to stir the secondary pollution that brings; Nitrogen gas stirring causes the reduction of partial pressure in the system also because its unique stripping effect, so that intrasystem dissolved oxygen, H 2, free ammonia, H 2S, CO 2Reduce Deng gas dissolved and part volatile organic matter concentration, reach the double effects that guarantees good anaerobic treatment environment and reduce the processing load.

Claims (7)

1. the nitrogen gas stirring method of an anaerobic treatment is characterized in that a kind of nitrogen gas stirring method of anaerobic treatment, specifically carries out according to following steps:
One, the nitrogen gas stirring system is arranged on reactor (4) bottom, wherein the nitrogen gas stirring system is comprised of aeration house steward (1), aeration branch pipe (2) and aeration plate (3), wherein aeration branch pipe (2) is communicated with aeration house steward (1), and at aeration branch pipe (2) aeration plate (3) is set;
Two, nitrogen is passed into aeration house steward (1), then enter aeration branch pipe (2), enter in mud in the reactor (4), the water mixed liquid by aeration plate (3) aeration, nitrogen rises to liquid level and overflows, and finishes the nitrogen gas stirring method of anaerobic treatment.
2. the nitrogen gas stirring method of a kind of anaerobic treatment according to claim 1 is characterized in that aeration plate in the step 1 (3) evenly is laid in reactor (4) bottom.
3. the nitrogen gas stirring method of a kind of anaerobic treatment according to claim 1 is characterized in that aeration plate in the step 1 (3) is microporous aeration disc, and the aperture is 0.2mm~0.5mm.
4. the nitrogen gas stirring method of a kind of anaerobic treatment according to claim 1, the total area that it is characterized in that aeration plate in the step 1 (3) be reactor (4) effectively floorage 5%~15%.
5. the nitrogen gas stirring method of a kind of anaerobic treatment according to claim 1 is characterized in that aeration mode is continuous aeration in the step 2.
6. the nitrogen gas stirring method of a kind of anaerobic treatment according to claim 1 it is characterized in that in the step 2 among the aeration house steward (1) that per hour nitrogen flow is 2%~10% of reactor (4) useful volume, and nitrogen gas purity is greater than 99%.
7. the nitrogen gas stirring method of a kind of anaerobic treatment according to claim 6, the useful volume that it is characterized in that reactor in the step 2 (4) is 10L, nitrogen flow is 0.2L/h among the aeration house steward (1).
CN2013102599075A 2013-06-26 2013-06-26 Nitrogen stirring method for anaerobic treatment Pending CN103304028A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104926062A (en) * 2015-07-07 2015-09-23 云南师范大学 Enrichment and domestication method of hydrogen nutrition type bacteria groups producing methane
CN105439374A (en) * 2014-12-12 2016-03-30 武汉森泰环保股份有限公司 Acidic high sulfate organic wastewater treatment process and apparatus
CN105853475A (en) * 2016-01-05 2016-08-17 浙江海洋学院 Preparation method of pemphis acidula extract

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CN1226201C (en) * 2003-09-26 2005-11-09 清华大学 Anaerobic/aerobic dual purpose waste water treatment system
JP2012035197A (en) * 2010-08-06 2012-02-23 Tsukishima Kikai Co Ltd Anaerobic digestion method
CN102649601A (en) * 2012-02-13 2012-08-29 东莞市开源环境科技有限公司 Orange segment type micro-porous aeration system
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105439374A (en) * 2014-12-12 2016-03-30 武汉森泰环保股份有限公司 Acidic high sulfate organic wastewater treatment process and apparatus
CN105439374B (en) * 2014-12-12 2018-01-23 武汉森泰环保股份有限公司 A kind of handling process and its device of acid high-sulfate organic wastewater
CN104926062A (en) * 2015-07-07 2015-09-23 云南师范大学 Enrichment and domestication method of hydrogen nutrition type bacteria groups producing methane
CN105853475A (en) * 2016-01-05 2016-08-17 浙江海洋学院 Preparation method of pemphis acidula extract

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Application publication date: 20130918