CN100556827C - A kind of active sludge oxidation ditch technique is removed the method for sewage ammonia nitrogen - Google Patents

A kind of active sludge oxidation ditch technique is removed the method for sewage ammonia nitrogen Download PDF

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CN100556827C
CN100556827C CNB2006100261469A CN200610026146A CN100556827C CN 100556827 C CN100556827 C CN 100556827C CN B2006100261469 A CNB2006100261469 A CN B2006100261469A CN 200610026146 A CN200610026146 A CN 200610026146A CN 100556827 C CN100556827 C CN 100556827C
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sewage
ammonia nitrogen
oxidation ditch
salt
metal
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CN101062813A (en
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吴敏
仓一华
祝娟芝
杨玉梅
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Sinopec Shanghai Petrochemical Co Ltd
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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
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    • Y02W10/10—Biological treatment of water, waste water, or sewage

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Abstract

A kind of active sludge oxidation ditch technique is removed the method for sewage ammonia nitrogen, comprises that sewage enters oxidation ditch and handles after preliminary sedimentation is removed solid impurity.At least respectively have nitrification zone, denitrification zone and a settling region in the oxidation ditch, sewage is distinguished in nitrification zone water inlet and circulation through each, with the settling region supernatant liquor discharging of water inlet equivalent.Add a kind of nitrobacteria culture promoter in the nitrification zone of water inlet, add-on is 5～20mg/l, and this nitrobacteria culture promoter component comprises molasses, metal-salt and sorbent material, and proportioning is: molasses: 100 weight parts; Metal-salt: 0.2～2.5 weight part; Sorbent material: 1～8 weight part.Metal-salt comprises A and B, and A is FeSO 4Or FeCl 2, B is MgSO 4Or CaCl 2Or both mixtures, the mol ratio of A and B is 10: (0.5～5), above-mentioned sorbent material are one or more the mixture in zeolite powder, diatomite, Powdered Activated Carbon or the flyash.

Description

A kind of active sludge oxidation ditch technique is removed the method for sewage ammonia nitrogen
Technical field
The present invention relates to adopt active sludge oxidation ditch technique, remove the method for sewage ammonia nitrogen through 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 active sludge oxidation ditch technique 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 active sludge oxidation ditch technique is removed the method for sewage ammonia nitrogen, and this method comprises that sewage enters oxidation ditch and handles after preliminary sedimentation is removed solid impurity.At least respectively have nitrification zone, denitrification zone and a settling region in the oxidation ditch, sewage is distinguished in nitrification zone water inlet and circulation through each, with the settling region supernatant liquor discharging of water inlet equivalent.Influent quality is controlled to be: 10～25 ℃ of water temperatures, pH value 7～9, basicity 200～350mg/L, BOD 5Load is less than 0.1kgBOD 5/ (kgMLVSS.d); Each is distinguished processing condition and is controlled to be: nitrification zone: sludge concentration 2～4g/L, mud 10～25d in age, dissolved oxygen concentration 2～5mg/l, hydraulic detention time 8～12 hours; Denitrification zone: sludge concentration 2～4g/L, mud 10～25d in age, anaerobic state, hydraulic detention time 2～4 hours; Settling region: hydraulic detention time 2～4 hours.
Add a kind of nitrobacteria culture promoter in the nitrification zone of water inlet, add-on is 5～20mg/l, and this nitrobacteria culture promoter is a kind of composition, and component comprises molasses, metal-salt and sorbent material, and its proportioning is:
Molasses: 100 weight parts;
Metal-salt: 0.2～2.5 weight part;
Sorbent material: 1～8 weight part,
Above-mentioned metal-salt comprises A and B, and wherein A is FeSO 4Or FeCl 2, B is MgSO 4Or CaCl 2Or both mixtures, the mol ratio of A and B is 10: (0.5～5), above-mentioned sorbent material are one or more the mixture in zeolite powder, diatomite, Powdered Activated Carbon or the flyash.
Metal-salt is preferably 0.5～1.5 weight part in the above-mentioned nitrobacteria culture promoter proportioning; The mol ratio of metal-salt A and B is preferably 10: (1.5～3); Sorbent material is preferably 2～6 weight parts.
The preferably first water of nitrobacteria culture promoter adds 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, enters in the oxidation ditch then and handles.The structure formation and the prior art of oxidation ditch are identical, at least respectively have nitrification zone, denitrification zone and a settling region, can any order connect in each district, and promptly denitrification zone can be preposition or rearmounted.Sewage is usually in nitrification zone water inlet, and each district that flows through circularly is with the supernatant liquor discharging of the settling region of water inlet equivalent.Can constitute one or several cycling elements by above-mentioned three districts in the oxidation ditch, in certain mononitration zone water inlet and from the discharging of a certain settling region; Also can constitute one or several cycling elements,, enter a settling region from another nitrification zone or a certain denitrification zone then, supernatant liquor discharging behind sludge settling from certain mononitration zone water inlet by nitrification zone and denitrification zone.When cycling element is one when above, nitrated promotor can only add in the nitrification zone that is positioned at water-in.Sewage carries out nitration reaction under aerobic condition in nitrification zone; In denitrification zone, under the anaerobic condition, carry out anti-nitration reaction; Realize the sedimentation of mud in the settling region, settled sludge part refluxes, and excess sludge regularly discharges.Institute is stressed that, different and the mutual type of attachment of the quantity of nitrification zone, denitrification zone and the settling region that exists in oxidation ditch in the existing oxidation ditch process is of a great variety, but the present invention does not propose special requirement to the structure formation of oxidation ditch, the structure formation of existing all kinds of active sludge oxidation ditch can both be applicable to technical scheme of the present invention, and basic requirement is at least respectively to exist nitrification zone, denitrification zone and a settling region to constitute a cycling element with order series connection arbitrarily.
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 metal-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, to have used after this promotor ammonia-N removal rate to improve nearly more than 20%, satisfied the processing requirement that the industrial biological method is removed 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 in sewage water inlet, and the structure of others such as oxidation ditch, processing condition etc. are basic identical with existing active sludge oxidation ditch technique.All these are also known by those of ordinary skill in the art, so will only pay attention to enumerating conditions such as nitrobacteria culture promoter proportioning, dosages in an embodiment.
Embodiment
The sewage of each embodiment test is the petrochemical complex composite wastewater, and through first precipitation process, influent quality:
COD Cr 255mg/l
NH 3-N 32mg/l
[embodiment 1～10]
Sewage is adjusted to water quality after preliminary sedimentation is removed solid impurity: 10～25 ℃ of water temperatures, pH value 7～9, basicity 200～350mg/L, BOD 5Load is less than 0.1kgBOD 5/ (kgMLVSS.d).
The oxidation ditch of disposing of sewage is configured to three channel type oxidation channels, is respectively nitrification zone, denitrification zone and settling region, and with above-mentioned order series connection, cubic capacity is 87000m 3
The processing condition of nitrated, denitrification and settling region are controlled to be:
Nitrification zone: sludge concentration 2～4g/L, mud 10～25d in age, dissolved oxygen concentration 2～5mg/l, hydraulic detention time 8～12 hours;
Anti-nitre district: sludge concentration 2～4g/L, mud 10～25d in age, anaerobic state, hydraulic detention time 2～4 hours;
Settling region: hydraulic detention time 2～4 hours.
Sewage enters oxidation ditch by the water-in of nitrification zone, and pass through nitrification zone circularly, denitrification zone and settling region.Flooding velocity is controlled to be 4500m 3/ hr, the settling region supernatant liquor discharging of equivalent.The settling region sludge part refluxes, and excess sludge regularly discharges.
Drop into nitrobacteria culture promoter continuously by the amount of setting in the sewage of nitrification zone, 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.
The water quality of test water outlet.Test result sees Table 2, and wherein comparative example does not add promotor, the same embodiment of all the other test conditionss for water inlet.
Table 1. unit: weight part
Figure C20061002614600091
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 5 50.5 80.2 3.1 90.3
Embodiment 2 10 40.6 84.1 2 93.8
Embodiment 3 15 42.1 83.5 1.9 94.1
Embodiment 4 20 43.3 83.0 2.4 92.5
Embodiment 5 15 51 80.0 3 90.6
Embodiment 6 10 48.1 81.1 3.2 90.0
Embodiment 7 5 48.3 81.1 3.5 89.1
Embodiment 8 10 42.8 83.2 2.6 91.9
Embodiment 9 15 48.6 80.9 2.5 92.2
Embodiment 10 5 52.2 79.5 3.1 90.3
Comparative example - 80.5 68.4 9.8 69.4

Claims (5)

1, a kind of active sludge oxidation ditch technique is removed the method for sewage ammonia nitrogen, this method comprises that sewage enters oxidation ditch and handles after preliminary sedimentation is removed solid impurity, at least respectively there are nitrification zone, denitrification zone and a settling region in the oxidation ditch, sewage is in nitrification zone water inlet and each district of circulation process, with the settling region supernatant liquor discharging of water inlet equivalent, influent quality is controlled to be: 10～25 ℃ of water temperatures, pH value 7～9, basicity 200～350mg/L, BOD 5Load is less than 0.1kgBOD 5/ (kgMLVSS.d); Each is distinguished processing condition and is controlled to be: nitrification zone: sludge concentration 2～4g/L, mud 10～25d in age, dissolved oxygen concentration 2～5mg/L, hydraulic detention time 8～12 hours; Denitrification zone: sludge concentration 2～4g/L, mud 10～25d in age, anaerobic state, hydraulic detention time 2～4 hours; The settling region: hydraulic detention time 2～4 hours,
It is characterized in that adding a kind of nitrobacteria culture promoter in the nitrification zone of water inlet, add-on is 5～20mg/L, and this nitrobacteria culture promoter is a kind of composition, and component comprises molasses, metal-salt and sorbent material, and its proportioning is:
Molasses: 100 weight parts;
Metal-salt: 0.2～2.5 weight part;
Sorbent material: 1～8 weight part,
Above-mentioned metal-salt comprises A and B, and wherein A is FeSO 4Or FeCl 2, B is MgSO 4Or CaCl 2Or both mixtures, the mol ratio of A and B is 10: (0.5～5), above-mentioned sorbent material are one or more the mixture in zeolite powder, diatomite, Powdered Activated Carbon or the flyash.
2, the method for removal sewage ammonia nitrogen according to claim 1 is characterized in that metal-salt is 0.5～1.5 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 the mol ratio of metal-salt A and B is 10 in the described nitrobacteria culture promoter proportioning: (1.5～3).
4, 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.
5, the method for removal sewage ammonia nitrogen according to claim 1 is characterized in that adding sewage 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).
CNB2006100261469A 2006-04-27 2006-04-27 A kind of active sludge oxidation ditch technique is removed the method for sewage ammonia nitrogen Active CN100556827C (en)

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