CN100542978C - Activated sludge process is removed the method for sewage ammonia nitrogen - Google Patents
Activated sludge process is removed the method for sewage ammonia nitrogen Download PDFInfo
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- CN100542978C CN100542978C CNB2006100251734A CN200610025173A CN100542978C CN 100542978 C CN100542978 C CN 100542978C CN B2006100251734 A CNB2006100251734 A CN B2006100251734A CN 200610025173 A CN200610025173 A CN 200610025173A CN 100542978 C CN100542978 C CN 100542978C
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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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
A kind of activated sludge process is removed the method for sewage ammonia nitrogen, comprising: 1) sewage enters the aeration tank after preliminary sedimentation is removed solid impurity, has the active sludge of domestication in the aeration tank, drops into nitrobacteria culture promoter in the sewage.This nitrobacteria culture promoter is a kind of composition, and component comprises molasses, ferrous salt and sorbent material, and its proportioning is: molasses: 100 weight parts; Ferrous salt: 0.2～2.5 weight part; Sorbent material: 1～8 weight part.Ferrous salt is vitriol or hydrochloride, and sorbent material is one or more the mixture in zeolite powder, diatomite, Powdered Activated Carbon or the flyash; 2) sewage enters first settling tank and carries out sludge settling; 3) the first settling tank supernatant liquor enters agitated pool, has the active sludge of domestication in the agitated pool; 4) sewage enters second settling tank and carries out sludge settling, the supernatant liquor discharging.Present method is because of having used above-mentioned promotor, and ammonia-N removal rate improves 15～20%.
Description
Technical field
The present invention relates to activated sludge process and remove the method for sewage ammonia nitrogen by the nitrification and denitrification process.
Background technology
Ammonia nitrogen is the bigger pollution factor of harm in the water body, and it can cause the eutrophication in river, lake, and water body self-purification ability is weakened.The ammonia nitrogen of polluted-water is often referred to the nitrogen that exists with the ammonia form, and the difficulty of ammonia nitrogen removal is much bigger in the contaminated water body of other organic pollutant relatively.In the prior art, the removal method of ammonia nitrogen mainly contains physics, chemistry and biological method in the contaminated water body.Physics or chemical method comprise air stripping method, break point chlorination, ion exchange adsorption, flocculent precipitation, electroosmose process, catalytic wet air oxidation, liquid-film method etc.These methods generally are used for the pre-treatment of high-concentration ammonia nitrogenous wastewater, and processing cost is very high.Biological process removal ammonia nitrogen is the effect by certain micro-organisms, thereby makes the ammonia nitrogen in the contaminated water body finally form the purpose that nitrogen effusion water body reaches purifying treatment.The biological process cost is much lower, and its applicable surface is also wider, as the removal of ammonia nitrogen in ammonia nitrogen purifying treatment, sanitary wastewater or the trade effluent of fishery cultivating water body etc.
Biological process is removed ammonia nitrogen and is mainly finished by nitrification process and denitrification process.In the nitrification process, in being oxidized to nitrate or nitrite nitrogen under the effect of ammonia nitrogen nitrifier under the aerobic condition; Denitrification is meant that nitrate and nitrite are reduced to the process of gaseous nitrogen.Under anoxia condition, utilize organism as electron donor, denitrifying bacterium is reduced to nitrogen with nitrate and nitrite.In these two processes, it is generally acknowledged that the nitrification process is even more important, it is the key that biological process is removed ammonia nitrogen, its difficulty of finishing is also higher relatively.Because most of nitrifiers are chemosynthetic autotroph microorganisms, and compare with the heterotroph microorganism, the autotrophic microorganism proliferative speed is slow, growing environment is harsh, can't get the mastery in the growth competition with the heterotroph microorganism under a lot of conditions.Therefore, when nitrifier content in the water body is low, only regulate environment such as the oxygen supply of sewage and pH value and still can't make the breeding of nitrifier self-sow in the short period of time, in industrial common way is directly to throw in the nitrated bacterial classification of cultured high density in sewage, contains the active sludge of high density nitrifier as input.The nitrated bacterial classification of these high densitys is to cultivate by special operation to obtain, and has all introduced the cultural method of the nitrated bacterial classification of high density that is used for removing the sewage ammonia nitrogen as Chinese patent ZL02156977.0 and Chinese patent application 00808700.8.Introduce nitrated bacterial classification by the external world and can guarantee that really the nitrification process successfully carries out in the short period of time, but operational management is very inconvenient, cost is also higher relatively, and the suitability of this method is not wide in range, just as handling very not suitable for the bigger industrial sewage of quantity discharged.
Summary of the invention
The invention provides a kind of activated sludge process and remove the method for sewage ammonia nitrogen, means such as oxygen supply by adding a kind of nitrobacteria culture promoter and fit adjustment sewage to sewage and pH value can be built in water body and are fit to nitrobacteria growth breeding environment, nitrifier is growth and breeding at short notice, removes in the ammonia nitrogen nitrification process need and introduces this technical problem of nitrated bacterial classification by the external world thereby can solve biological process.
Below be the technical scheme that the present invention solves the problems of the technologies described above:
A kind of activated sludge process is removed the method for sewage ammonia nitrogen, and this method comprises:
1) sewage enters the aeration tank after preliminary sedimentation is removed solid impurity, have the active sludge of domestication in the aeration tank, drop into nitrobacteria culture promoter in the sewage, this nitrobacteria culture promoter is a kind of composition, component comprises molasses, ferrous salt and sorbent material, and its proportioning is:
Molasses: 100 weight parts;
Ferrous salt: 0.2～2.5 weight part;
Sorbent material: 1～8 weight part
Above-mentioned ferrous salt is vitriol or hydrochloride, and sorbent material is one or more the mixture in zeolite powder, diatomite, Powdered Activated Carbon or the flyash.
The nitrobacteria culture promoter dosage is 5～20mg/l, and sludge loading is controlled to be 0.1～0.5kgBOD
5/ kgMLVSS, mud age is 5～15d, keeps dissolved oxygen concentration 2～8mg/l, pH value 6～9, sewage is 8～12 hours in the aeration tank residence time;
2) sewage enters first settling tank and carries out sludge settling, and the sedimentation sludge part returns the aeration tank, and return sludge ratio is 0.2～1.0;
3) the first settling tank supernatant liquor enters agitated pool, has the active sludge of domestication in the agitated pool, and sludge loading is controlled to be 0.1～0.3kgBOD
5/ kgMLVSS, mud age is 5～15d, pH value 6～9, the COD of sewage
CrBe controlled to be 100～300mg/l, sewage is 2～4 hours in the agitated pool residence time;
4) sewage enters second settling tank and carries out sludge settling, the supernatant liquor discharging.
Ferrous salt is preferably 0.8～2.0 weight part in the above-mentioned nitrobacteria culture promoter proportioning; Sorbent material is preferably 2～6 weight parts.
The preferably first water of nitrobacteria culture promoter drops in the sewage after being mixed with diluent again, and the weight ratio of nitrobacteria culture promoter and water is 1 in the diluent: (10～100).Can make that like this promotor is more even with mixing of sewage.
In technique scheme, sewage at first carries out preliminary precipitation process, to remove the bigger solid impurity of volume.Enter then in the aeration tank, carry out nitration reaction under aerobic condition, the release position of nitrobacteria culture promoter generally is positioned at water inlet place of sewage.Sewage after the nitration treatment is earlier through sludge settling, and the sedimentation sludge part is back to the aeration tank.Supernatant liquor after the sedimentation enters agitated pool, carries out anti-nitration reaction under the anaerobic condition, because denitrification process needs the carbon source of some amount, and therefore must be with the COD of sewage
CrBe controlled to be 100～300mg/l, generally can realize adjusting by mixing sanitary sewage to COD.When below standard, can one aerating apparatus be set as the COD of sewage of final discharging in the nearly water outlet position of agitated pool, sewage carried out an aeration again before water outlet handles.After the primary sludge sedimentation, supernatant liquor can directly discharge sewage after denitrification is handled again.
As everyone knows, nitrifier is relatively responsive to outside atmosphere, and growth and breeding is very high to environment requirement, also needs suitable nitrifier and cultivate and promote the material existence except that aerobic and suitable potential of hydrogen of needs and temperature.Existing result of study shows that dissolved organic carbon (DOC), molecular state organism (POM), this three classes material cultivation to nitrifier under low consistency conditions of each biostearin have obvious facilitation.The nitrobacteria culture promoter that uses among the present invention mainly contains three kinds of components, and molasses wherein are main component, and it is rich in dissolved organic matter (DOC), macromolecular substance (POM), VITAMIN.It two is a ferrous salt, and its effect is the necessary mineral substance of additional nitration bacteria growing, and participates in nitration reaction as the component of enzyme.The third composition is a sorbent material, and it plays absorption, precipitates ammonia nitrogen, the nitrobacteria growing carrier is provided in the nitration reaction system.
Compared with prior art, advantage of the present invention mainly comprises two aspects.The one, by directly adding a kind of nitrobacteria culture promoter, make sewage itself produce the environment that is fit to the nitrobacteria growth breeding to sewage, nitrifier can breed growth at short notice fast, needn't introduce nitrated bacterial classification by the external world again, and operating process is more simple.Environment such as the temperature of fit adjustment sewage, dissolved oxygen and pH value, the nitrification process can be carried out at short notice smoothly, under the identical situation of other condition, ammonia-N removal rate can improve 15～20% after having used this promotor, has satisfied the processing requirement of industrial biological method removal ammonia nitrogen well; The 2nd, because the main composition molasses of the promotor of adopting are the waste materials that sugar industry produces, its price is very cheap, so the whole cost of this promotor is very low.From another angle, the comprehensive utilization of the refuse that the present invention also produces for sugar industry provides a new approach.
Below will the invention will be further described by specific embodiment, with respect to prior art, key of the present invention is to have added a kind of nitrobacteria culture promoter to sewage in nitrifying process, others such as technological process, processing condition are then basic identical with existing activated sludge process removal sewage ammonia nitrogen method, and all these are also known by those of ordinary skill in the art.So will pay attention to enumerating in an embodiment to contents such as nitrobacteria culture promoter proportioning, dosages.
Embodiment
The sewage of each embodiment test is the petrochemical complex composite wastewater, and through first precipitation process, influent quality is:
COD
Cr 496mg/l
NH
3-N 35mg/l
PH value 8.0
[embodiment 1～10]
It is 1120m that the sewage of the first precipitation process of above-mentioned warp enters a volume
3There is the active sludge of taming in the aeration tank in the aeration tank.Flooding velocity is controlled to be 100m
3/ hr drops into nitrobacteria culture promoter continuously in water inlet sewage.Nitrobacteria culture promoter is mixed with diluent with service water earlier, and the weight ratio of nitrobacteria culture promoter and water is 1 in the diluent: (10～100).The nitrobacteria culture promoter that each embodiment uses is prepared in required ratio, and wherein molasses are 100 weight parts, and the proportioning of other component sees Table 1, and the promotor dosage sees Table 2.Sewage carries out nitration reaction under aerobic condition in the aeration tank, processing condition are controlled to be:
Sludge loading 0.1～0.5kgBOD
5/ kgMLVSS, mud 5～15d in age keeps dissolved oxygen concentration 2～8mg/l; PH value 6～9, dwell time of sewage 8～12 hours;
The sewage that comes from the aeration tank enters first settling tank and carries out sludge settling, and the sedimentation sludge part returns the aeration tank, and return sludge ratio is 0.2～1.0.Excess sludge regularly discharges;
It is 350m that the sewage that comes from first settling tank enters a volume
3Agitated pool carries out anti-nitration reaction under the anaerobic condition, processing condition are controlled to be:
Sludge loading 0.1～0.3kgBOD
5/ kgMLVSS, mud 5～15d in age, the COD of sewage
Cr100～300mg/l (regulating) by admixture sanitary sewage in sewage, pH value 6～9, dwell time of sewage 2～4 hours carries out an aeration again and handles before the sewage water outlet;
The sewage that comes from agitated pool enters second settling tank and carries out sludge settling, the supernatant liquor discharging, and settling tank mud regularly discharges.
The water quality of test water outlet.Test result sees Table 2, and wherein comparative example is that the aeration tank water inlet does not add promotor, the same embodiment of all the other test conditionss.
Table 1. unit: weight part
Table 2.
| Promotor dosage (mg/l) | Water outlet COD Cr (mg/l) | COD CrClearance (%) | Water outlet NH 3-N (mg/l) | NH 3-N clearance (%) | |
| Embodiment 1 | 16 | 68.2 | 86.3 | 4.7 | 86.6 |
| Embodiment 2 | 8 | 68.4 | 86.2 | 4.6 | 86.9 |
| Embodiment 3 | 10 | 54.3 | 89.1 | 3.9 | 88.9 |
| Embodiment 4 | 12 | 57.8 | 88.3 | 3.7 | 89.4 |
| Embodiment 5 | 20 | 64.3 | 87.0 | 3.3 | 90.7 |
| Embodiment 6 | 19 | 62.2 | 87.5 | 3.7 | 89.3 |
| Embodiment 7 | 18 | 70.8 | 85.7 | 4.4 | 87.4 |
| Embodiment 8 | 7 | 69.1 | 86.1 | 5.1 | 85.4 |
| Embodiment 9 | 10 | 54.9 | 88.9 | 4.2 | 88.0 |
| Embodiment 10 | 5 | 70.7 | 85.7 | 5.2 | 85.3 |
| Comparative example | - | 82.4 | 83.4 | 10.3 | 70.6 |
Claims (4)
1, a kind of activated sludge process is removed the method for sewage ammonia nitrogen, and this method comprises:
1) sewage enters the aeration tank after preliminary sedimentation is removed solid impurity, have the active sludge of domestication in the aeration tank, drop into nitrobacteria culture promoter in the sewage, this nitrobacteria culture promoter is a kind of composition, component comprises molasses, ferrous salt and sorbent material, and its proportioning is:
Molasses: 100 weight parts;
Ferrous salt: 0.2～2.5 weight part;
Sorbent material: 1～8 weight part,
Above-mentioned ferrous salt is vitriol or hydrochloride, and sorbent material is one or more the mixture in zeolite powder, diatomite, Powdered Activated Carbon or the flyash,
The nitrobacteria culture promoter dosage is 5～20mg/1, and sludge loading is controlled to be 0.1～0.5kgBOD
5/ kgMLVSS, mud age is 5～15d, keeps dissolved oxygen concentration 2～8mg/1, pH value 6～9, sewage is 8～12 hours in the aeration tank residence time;
2) sewage enters first settling tank and carries out sludge settling, and the sedimentation sludge part returns the aeration tank, and return sludge ratio is 0.2～1.0;
3) the first settling tank supernatant liquor enters agitated pool, has the active sludge of domestication in the agitated pool, and sludge loading is controlled to be 0.1～0.3kgBOD
5/ kgMLVSS, mud age is 5～15d, pH value 6～9, the COD of sewage
CrBe controlled to be 100～300mg/1, sewage is 2～4 hours in the agitated pool residence time;
4) sewage enters second settling tank and carries out sludge settling, the supernatant liquor discharging.
2, the method for removal sewage ammonia nitrogen according to claim 1 is characterized in that ferrous salt is 0.8～2.0 weight part in the described nitrobacteria culture promoter proportioning.
3, the method for removal sewage ammonia nitrogen according to claim 1 is characterized in that sorbent material is 2～6 weight parts in the described nitrobacteria culture promoter proportioning.
4, the method for removal sewage ammonia nitrogen according to claim 1 is characterized in that dropping into reaction tank again after the first water of described nitrobacteria culture promoter is mixed with diluent, and the weight ratio of nitrobacteria culture promoter and water is 1 in the diluent: (10～100).
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2006100251734A CN100542978C (en) | 2006-03-29 | 2006-03-29 | Activated sludge process is removed the method for sewage ammonia nitrogen |
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|---|---|---|---|
| CNB2006100251734A CN100542978C (en) | 2006-03-29 | 2006-03-29 | Activated sludge process is removed the method for sewage ammonia nitrogen |
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| CN100542978C true CN100542978C (en) | 2009-09-23 |
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| CN103374539B (en) * | 2013-07-02 | 2014-12-10 | 中国科学院烟台海岸带研究所 | Proteus mirabilis capable of eliminating ammonia nitrogen in water environment and application thereof |
| CN107746104B (en) * | 2017-09-30 | 2021-10-22 | 延边大学 | Bioactive water and preparation method thereof |
| CN110980961A (en) * | 2019-11-26 | 2020-04-10 | 浙江永续环境工程有限公司 | Denitrifying microbial inoculum and sewage treatment technology applying same |
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