CN102502950B - Method for improving activity of nitrification function microorganisms in activated sludge by directly adding Fe ions - Google Patents
Method for improving activity of nitrification function microorganisms in activated sludge by directly adding Fe ions Download PDFInfo
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- 244000005700 microbiome Species 0.000 title claims abstract description 74
- 239000010802 sludge Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 43
- 230000000694 effects Effects 0.000 title claims abstract description 35
- 150000002500 ions Chemical class 0.000 title abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 87
- 239000010865 sewage Substances 0.000 claims abstract description 44
- 239000013043 chemical agent Substances 0.000 claims abstract description 37
- 239000000126 substance Substances 0.000 claims abstract description 13
- 238000005842 biochemical reaction Methods 0.000 claims abstract description 10
- 230000002503 metabolic effect Effects 0.000 claims abstract description 7
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- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 37
- 230000008569 process Effects 0.000 claims description 28
- 238000006243 chemical reaction Methods 0.000 claims description 20
- 229910052742 iron Inorganic materials 0.000 claims description 13
- 238000012258 culturing Methods 0.000 claims description 11
- 230000004060 metabolic process Effects 0.000 claims description 9
- 238000012546 transfer Methods 0.000 claims description 8
- 238000006911 enzymatic reaction Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000002378 acidificating effect Effects 0.000 claims description 6
- 239000012190 activator Substances 0.000 claims description 6
- 238000005273 aeration Methods 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 230000001580 bacterial effect Effects 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 6
- 230000001546 nitrifying effect Effects 0.000 abstract description 5
- 230000000813 microbial effect Effects 0.000 abstract description 3
- 230000007774 longterm Effects 0.000 abstract 2
- 150000003839 salts Chemical class 0.000 abstract 2
- 239000007788 liquid Substances 0.000 abstract 1
- 239000013589 supplement Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
- -1 ammonification Chemical compound 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- 229910002651 NO3 Inorganic materials 0.000 description 7
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 7
- 241000108664 Nitrobacteria Species 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000006396 nitration reaction Methods 0.000 description 4
- 230000009257 reactivity Effects 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 239000011259 mixed solution Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
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- 241000186361 Actinobacteria <class> Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
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- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 241001148470 aerobic bacillus Species 0.000 description 1
- 238000004176 ammonification Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
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- 230000006872 improvement Effects 0.000 description 1
- 239000003295 industrial effluent Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229920000592 inorganic polymer Polymers 0.000 description 1
- 230000003834 intracellular effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
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- 239000011707 mineral Substances 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
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Classifications
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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
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention provides a method for improving the activity of nitrification function microorganisms in activated sludge by directly adding Fe ions, which comprises a culture stage and a long-term operation activity maintaining stage of the nitrification function microorganisms, wherein Fe is added in a sewage biological denitrification system2+Or Fe3+The ferric salt chemical agent is directly added into the activated sludge mixed liquid of the aerobic tank of the biological denitrification system, and simultaneously alkaline substances are added, so that Fe is gradually reduced in the activity maintaining stage of long-term operation of the microorganisms with nitrification function3+Or Fe2+The dosage of the ferric salt chemical agent, and the dosage of Fe3+Or Fe2+Iron salt chemicals of (2) are used only to supplement Fe3+Or Fe2+The amount of loss of . The invention can effectively improve the biochemical reaction metabolic activity of the nitrifying microorganisms, promote the propagation of the nitrifying functional microorganisms and the secretion of enzymes in microbial cells, improve the applicability of the sewage biological denitrification technology, solve the bottleneck problem of a sewage biological denitrification system, and obviously enhance the low temperature resistance of the system.
Description
Technical field
The present invention relates to the method that a kind of raising is used for the interior nitrated ability of nitrated microorganism under cold condition of active sludge of bio-denitrifying sewage processing, belong to technical field of sewage.
Background technology
Activated sludge process is a kind of bioremediation of sewage, is by the organism in the removal of microorganisms sewage in the active sludge, simultaneously collaborative a part of phosphorus element and the nitrogen removed.Traditional active sludge saprobia treatment system is made up of aeration tank (Aerobic Pond), settling tank, mud return-flow system and excess sludge removal system, under artificial aerobic condition, various microbial populations in the treatment system are carried out continuous mixed culture, form active sludge, utilize microorganism cohesion, absorption and oxygenizement in the active sludge, to decompose the organic pollutant of removing in the sewage.Make mud and water sepn then, most of mud is back to the aeration tank again and forms mixed solution (active sludge intermixture), and redundance is then discharged Sludge System.
Active sludge saprobia denitride technology is a kind of biological sewage denitrifying method that comes in the development of traditional activated sludge process basis, and its biological denitrificaion comprises the conversion process of nitrogen such as ammonification, nitrification and denitrification.Organonitrogen in the waste water is converted into ammonia nitrogen by aminating reaction under the effect of Ammonifying bacteria, original ammonia nitrogen in waste water, under oxygen supply abundance and other conditions suitable, be oxidized to nitric nitrogen (nitrite and nitrate) by nitration reaction under nitrated microbial process, nitric nitrogen can be converted into harmless molecular state nitrogen by anti-nitration reaction under the denitrifying microorganism effect under oxygen free condition.Therefore, being nitrogen and entering in the atmosphere by the nitrogen transformation of above-mentioned reaction process with various forms in the sewage, also is main purpose and the approach of present biological denitrificaion.
The bio-denitrifying sewage system is made up of preliminary sedimentation tank, anoxic pond, Aerobic Pond, second pond, mixed solution internal circulation system, mud return-flow system etc. as shown in Figure 1.Sewage is earlier by the preliminary sedimentation tank precipitation, and the mud of preliminary sedimentation is by the bottom discharging of preliminary sedimentation tank.Generally need in the anoxic pond to adopt the mechanical stirring mode to keep the admixture of active sludge intermixture, general machinery or the blast aeration mode of adopting guarantees to provide enough oxygen for active sludge microorganism in the Aerobic Pond.According to the technology changes of operating modes, can nitrate be back to anoxic pond by the mixed solution internal circulation system, also can nitrate be back to anoxic pond by the mud return-flow system; Anoxic pond is interior to be that nitrogen or gaseous nitrogen oxide are realized biological denitrificaion by denitrifying microorganism with nitrate reduction; The nitration reaction of oxidation operation reaction and nitrogen takes place in the Aerobic Pond.Sewage after the processing is discharged by second pond top, and unnecessary mud is refluxed by the second pond bottom or discharges.
In above-mentioned reaction process, ammonifying process is to be finished by bacterium, fungi and actinomycetes with decomposing protein and nitrogen containing derivative ability thereof that nature extensively exists, and it can not become the restricted process that influences bio-denitrifying sewage usually; Denitrification process is also finished by the heterotrophism denitrifying microorganism, and denitrifying microorganism belongs to amphimicrobe, and it has in anaerobic under the condition of nitrate existence, utilizes the N in nitrate and the nitrite
5+And N
3+As the electron acceptor(EA) in the energy metabolism, be nitrogen as carbon source and electron donor with nitrate-nitrogen reduction with organism.Though denitrification process is as the biochemical reaction process of a complexity, the influence that it is subjected to temperature of reaction, pH value, dissolved oxygen, inhibitory substance and can utilizes carbon source.In general, as long as can utilize the carbon source abundance, denitrification process can not become the restricted process that influences bio-denitrifying sewage yet.Yet for nitrifying process, it is finished by two processes by two groups of chemosynthetic autotroph aerobic microbiologicals, and the first step is converted into nitrite by Nitrosomas with ammonia nitrogen, and the second step Nitromonas is converted into nitrate with nitrite.Usually Nitrosomas and Nitromonas are referred to as nitrated microorganism (or nitrobacteria), it belongs to the obligate aerobic bacteria, utilizes mineral compound such as CO
3 2-, HCO
3 -And CO
2Make carbon source, from oxidation NH
4 +Or NO
2 -Process in obtain energy and finish the metabolism reaction.Owing to compare with peculiar microorganism, the ratio rate of rise of nitrobacteria is little, and productive rate is low, makes nitrobacteria shared ratio very little (being about 5%) in active sludge.Therefore, nitrifying process is subjected to factor affecting such as basicity and pH value, inhibitory substance, matrix (ammonia nitrogen and dissolved oxygen), organic loading, temperature of reaction bigger.In above-mentioned influence factor, temperature of reaction is generally the uncontrollable condition of extensive sewage treatment process, but for the microorganism that participates in nitration reaction, the Nitrosomas optimum growth temp is 35 ℃, the optimum growth temp of Nitromonas is 35～42 ℃, the reduction of temperature of reaction not only causes the decline of the ratio rate of rise of nitrobacteria, cause simultaneously the reduction significantly of nitrobacteria activity to a greater extent, the reduction of nitrification activity directly causes the decline of the nitrated ability for the treatment of system and efficient even destroys fully.Therefore, nitrifying process is the restricted process that influences the bio-denitrifying sewage ability, and temperature of reaction is to the influence of nitrated microorganism active, and particularly the nitrated problem of low temperature (less than 12 ℃) condition has become the restricted bottleneck problem of bio-denitrifying sewage.
Therefore, for the bio-denitrifying sewage technology, not only have the denitrification operation stability problem, and low temperature influences problem to nitrated microorganism active and still do not have terms of settlement preferably at present, it also becomes the bottleneck problem of restriction bio-denitrifying sewage technical development.
Summary of the invention
The present invention is directed to cold condition to the problem of nitrification function microorganism active influence, a kind of Fe ion (Fe that directly adds is provided
3+Or Fe
2+) improve the method for nitrification function microorganism active in the active sludge, this method can effectively solve the relatively poor and low temperature of operation stability that existing bio-denitrifying sewage system exists influences problem to the nitrification function microorganism active, improve nitrification function microbial biochemical reaction activity, improve the anti-low temperature effect ability of biological denitrification system.
The method that directly adds nitrification function microorganism active in the Fe ion raising active sludge of the present invention comprises the cultivation stage of nitrification function microorganism and the active maintenance stage of long-time running of nitrification function microorganism, and the specific implementation process is as follows:
(1) the nitrification function microorganism culturing stage:
Be in steady operational status or the nitrification function microorganism has in the bio-denitrifying sewage system of normal nitrification function, with Fe in the nitrification function microorganism
2+Or Fe
3+The molysite chemical agent (be 10%～20%FeCl as concentration
2Or FeSO
4Or concentration is 5%～15% FeCl
3) directly be added in the active sludge intermixture of biological denitrification system Aerobic Pond, dosage control contains Fe at active sludge intermixture
3+Or Fe
2+Amount is 3mg/gMLVSS d～5mg/gMLVSS d, add a little according to the Aerobic Pond response style and different, for complete hybrid Aerobic Pond, the molysite chemical agent directly is added to the central part of biological denitrification system Aerobic Pond, for the pulling flow type Aerobic Pond, the molysite chemical agent directly is added to the middle leading portion of biological denitrification system Aerobic Pond gallery, be in the gallery between 1.5 hours～2.5 hours according to flow through time period of Aerobic Pond of the active sludge of theoretical water power residence time meter namely, adding alkaline matter simultaneously (is 2%～5% Na as concentration
2CO
3Or NaHCO
3), the active sludge intermixture basicity that the alkaline matter dosage guarantees to flow out in the Aerobic Pond is with C
aCO
3Meter is not less than 75mg/L(does not have ceiling restriction, but the conference of alkaline matter dosage causes the working cost too high), and utilize the interior aeration mixing effect of Aerobic Pond to realize the short mix of molysite chemical agent and active sludge, the effect of alkaline matter be by in and molysite chemical agent acidic substance, avoid acidic substance that the molysite chemical agent contains to the damage influence of active sludge microorganism, the molysite chemical agent that adds and alkaline matter generation chemical reaction finally generate Fe (OH)
3, the molysite chemical agent that adds and alkaline matter total amount are finally controlled and are contained Fe amount reach 30～50mgFe/gMLVSS in making active sludge intermixture; Keep the original influent load condition of bio-denitrifying sewage system constant in culturing process, prolong active sludge mud age gradually, make 1～2 times that reaches design mud age of satisfying normal nitrated loading condiction, this culturing process required time is 10～20 days;
(2) the nitrification function microorganism culturing stage enters the active maintenance stage of long-time running of nitrification function microorganism after finishing, along with microorganism flco and chemical flco (refer to the Fe (OH) that generates
3) formation of combination is with stable, reduces Fe gradually
3+Or Fe
2+The dosage of molysite chemical agent, the Fe that adds
3+Or Fe
2+The molysite chemical agent only be used for to replenish Fe
3+Or Fe
2+Number of dropouts, one liter of sewage Fe of every processing in the bio-denitrifying sewage system
3+Or Fe
2+Additional dosage be 1mg-2mg, this dosage is only as with excess sludge discharge loss Fe
3+Or Fe
2Replenish Fe in the bio-denitrifying sewage system that concrete dosage causes according to excess sludge discharge
3+Or Fe
2Number of dropouts is calculated, Fe
3+Or Fe
2+Chemical agent adds a little consistent with cultivation stage; This stage iron ion is got involved has the active sludge microorganism metabolic process of denitrification functions, strengthen iron ion and participate in electronics transfer function and the effect of enzymatic reaction activator, can effectively improve the biochemical reaction metabolic activity of microorganism, and the secretion of bacterial reproduction and enzyme had promoter action, form the nitrification function active sludge with higher biological metabolism activity thus.
The present invention utilizes ferro element and active sludge microorganism by chemistry and biochemical keying action, strengthen ferro element in the intracellular electronics transfer function of nitrobacteria and the effect of enzymatic stimulator, can effectively improve the biochemical reaction metabolic activity of nitrated microorganism, promote the breeding of nitrification function microorganism and the secretion of microorganism cells endoenzyme, avoid the excessive iron element to the murder by poisoning influence of microorganism simultaneously, formed the nitrification function active sludge with higher biological metabolism activity thus.The invention solves the cultivation problem with high reactivity nitrification function microorganism and have the steady running problem of high reactivity nitrification function microorganism, realized the quick combination of ferro element and active sludge, and utilize electronics transfer function and the enzymatic reaction stimulator effect of ferro element in the nitrification function microorganism cells, make the nitrification function microorganism keep high reactivity for a long time.
The present invention has improved the suitability of bio-denitrifying sewage technology, solved the bottleneck problem that the bio-denitrifying sewage system exists, the anti-low temperature ability of system is obviously strengthened, and is lower than under 10 ℃ of conditions in temperature of reaction, nitrification efficiency can keep more than 70%, and nitric efficiency reaches more than 85%.Owing to only adopt a spot of Fe that in biological denitrification system aerobic reaction process, directly offers medicine
3+Or Fe
2+Replaced for solving nitrated problem and added the nitrated microorganism of various bio-carriers or artificial culture, not only dosing method is simple and reliable, convenient management, and investment and running cost are low, are particularly suitable for the application of the biological treatment of the denitrogenation processing of town sewage and the trade effluent with similar condition of water quality and poisonous and harmful, indegradable industrial effluent.Be suitable for the reinforcement of newly-built sewage water denitrification system nitrification function and the upgrading of existing actual production system, have practical significance to solving bio-denitrifying sewage operation stability and the nitrated bottleneck problem of low temperature.
Description of drawings
Fig. 1 is the structural representation of bio-denitrifying sewage system.
Embodiment
The present invention is by arranging corresponding medicine system (referring to Fig. 1) outside bio-denitrifying sewage system facility, directly be added to a certain amount of molysite chemical agent in the Aerobic Pond, combination by molysite chemistry flco and active sludge microorganism flco, strengthen iron ion and participate in electronics transfer function and the effect of enzymatic reaction activator, not only effectively improve the biochemical reaction metabolic activity of microorganism, and improve and strengthened the flco structure of active sludge, formed the nitrification function active sludge that has than high reaction activity and flco stability, final active sludge intermixture carries out mud-water separation in second pond, separate back active sludge supernatant liquor and be further processed or discharge.
Method of the present invention comprises the cultivation stage of nitrification function microorganism and the active maintenance stage of long-time running of nitrification function microorganism.
The specific implementation process in nitrification function microorganism culturing stage is as follows:
For the bio-denitrifying sewage system, guarantee that at first the nitrification function microorganism is in steady operational status in the system, or the nitrification function microorganism has normal nitrification function in the process cultured continuously assurance system, on this basis, carries out the cultivation of high reactivity nitrification function active sludge.With certain density Fe
2+Or Fe
3+The molysite chemical agent (be 10%～20%FeCl as concentration
2Or FeSO
4Or concentration is 5%～15% FeCl
3) directly be added in the active sludge intermixture of biological denitrification system Aerobic Pond, dosage control contains Fe at active sludge intermixture
3+Or Fe
2+Amount is 3mg/gMLVSS d～5mg/gMLVSS d, add a little according to the Aerobic Pond response style and different, for complete hybrid Aerobic Pond, the molysite chemical agent directly is added to the central part of biological denitrification system Aerobic Pond, for the pulling flow type Aerobic Pond, the molysite chemical agent directly is added to the middle leading portion of biological denitrification system Aerobic Pond gallery, be in the gallery between 1.5h～2.5h according to flow through time period of Aerobic Pond of the active sludge of theoretical water power residence time meter namely, adding certain density alkaline matter simultaneously (is 2%～5% Na as concentration
2CO
3Or NaHCO
3), the active sludge intermixture basicity that the alkaline matter dosage guarantees to flow out in the Aerobic Pond is with C
aCO
3Meter is not less than 75mg/L(does not have ceiling restriction, but the alkaline matter dosage causes the working cost too high greatly), and utilize the interior aeration mixing effect of Aerobic Pond to realize the short mix of molysite chemical agent and active sludge, the effect of alkaline matter be by in and molysite chemical agent acidic substance, avoid acidic substance that the molysite chemical agent contains to the damage influence of active sludge microorganism, the molysite chemical agent that adds and alkaline matter generation chemical reaction finally generate Fe (OH)
3, the molysite chemical agent that adds and alkaline matter total amount are finally controlled and are contained Fe amount reach 30～50mgFe/gMLVSS in making active sludge intermixture; Keep the original influent load condition of bio-denitrifying sewage system constant in culturing process, prolong active sludge mud age gradually, make 1～2 times that reaches design mud age of satisfying normal nitrated loading condiction, this culturing process required time is 10～20 days;
The Fe that adds
2+Or Fe
3+Molysite chemical agent and alkaline matter following chemical reaction takes place:
4Fe
2+ + O
2 + 2H
2O = 4Fe
3+ + 4OH
- ，
2Fe
3++ 3CO
3 2－+3H
2O→2Fe(OH)
3+3 CO
2↑，
Fe
3++ 3HCO
3 －→Fe(OH)
3+3CO
2↑，
Behind the cultivation stage of finishing the nitrification function microorganism, enter the active maintenance stage of long-time running of nitrification function microorganism.Along with microorganism flco and chemical flco (refer to the Fe (OH) that generates
3) formation of combination is with stable, reduces Fe gradually
2+Or Fe
3+The molysite chemical agent (as FeCl
2, FeSO
4, FeCl
3) dosage, it adds a little consistent with cultivation stage, molysite chemical agent (FeCl
2, FeSO
4, FeCl
3) system's molysite number of dropouts of causing according to excess sludge discharge of dosage calculates, one liter of sewage Fe of every processing in the bio-denitrifying sewage system usually
3+Or Fe
2+Additional dosage be 1mg-2mg, with this understanding, iron ion is mainly absorbed by microorganism by all means, because iron is the important component part of cytopigment in the sewage disposal microorganism biological oxydase system, it plays the electronics transfer function in biological oxidation process, iron is again the important composition element of various coenzyme simultaneously, it plays the effect of enzymatic reaction activator again, therefore, this stage iron ion is got involved has the active sludge microorganism metabolic process of denitrification functions, strengthen iron ion and participate in electronics transfer function and the effect of enzymatic reaction activator, it not only can effectively improve the biochemical reaction metabolic activity of microorganism, and the secretion of bacterial reproduction and enzyme had certain promoter action, formed the nitrification function active sludge with higher biological metabolism activity thus.
For bio-denitrifying sewage, above-mentioned effect is huge with influence, at first the iron ion intervention has the active sludge microorganism metabolic process of denitrification functions under artificial regulatory, strengthen iron ion and participate in electronics transfer function and the effect of enzymatic reaction activator, it not only effectively improves the biochemical reaction metabolic activity of microorganism, and its improvement and the flco structure of having strengthened active sludge, formed the novel active mud that has than high reaction activity and flco stability; Secondly, molysite is a kind of good coagulating agent, Fe
2+Or Fe
3+In hydrolytic process, with the variation of the pH of system value (basicity), can generate the different complex cation of electric charge or complex anion.The bridging action of hydroxyl (OH) in the multinuclear hydroxo complex wherein, can generate the polymerization degree and be 2～900 inorganic polymer material, it not only can play the adsorption of strengthening active sludge, and coprecipitated effect can take place with the oxyhydroxide of multiple metal in it, removal produces the heavy metal that suppresses influence to some enzyme, play the effect to shielding biological respinse enzyme inhibitors, further strengthen the biochemical reaction activity of active sludge.
Add main technique design variable such as the following table of the biological denitrification system after iron ion fortified:
By enforcement of the present invention, can reach following wastewater treatment efficiency:
1. (1～2mgFe/L), the anti-low temperature ability of system is obviously strengthened, and is lower than under 10 ℃ of conditions in temperature of reaction, and system's nitrification efficiency can keep more than 70%, and system's nitric efficiency reaches more than 85% under lower molysite dosage;
2. the system handles load significantly improves, and the volumetric loading rate increases by 1 times than the traditional biological denitrification system.
3. have system and start soon, dosing method is simple, and dosage is low, economical operation is reliable;
4. system's capacity of resisting impact load and operation stability improve;
5. surplus sludge volume few (reducing by 20～30%) reduces sludge treatment load and expense.
Result in experiment and the practice shows that effect of the present invention has been realized purpose of the present invention, has received desirable technique effect.
Claims (1)
1. one kind directly adds the method that the Fe ion improves nitrification function microorganism active in the active sludge, comprises the cultivation stage of nitrification function microorganism and the active maintenance stage of long-time running of nitrification function microorganism, and it is characterized in that: the specific implementation process is as follows:
(1) the nitrification function microorganism culturing stage:
Be in steady operational status or the nitrification function microorganism has in the bio-denitrifying sewage system of normal nitrification function, with Fe in the nitrification function microorganism
2+Or Fe
3+The molysite chemical agent directly be added in the active sludge intermixture of biological denitrification system Aerobic Pond described Fe
2+Or Fe
3+The molysite chemical agent refer to that concentration is 10%～20% FeCl
2Or FeSO
4Or concentration is 5%～15% FeCl
3, dosage control contains Fe at active sludge intermixture
3+Or Fe
2+Amount is 3mg/gMLVSS d～5mg/gMLVSS d, add a little according to the Aerobic Pond response style and different, for complete hybrid Aerobic Pond, the molysite chemical agent directly is added to the central part of biological denitrification system Aerobic Pond, for the pulling flow type Aerobic Pond, the molysite chemical agent directly is added to the middle leading portion of biological denitrification system Aerobic Pond gallery, be in the gallery between 1.5 hours～2.5 hours according to flow through time period of Aerobic Pond of the active sludge of theoretical water power residence time meter namely, add alkaline matter simultaneously, the active sludge intermixture basicity that the alkaline matter dosage guarantees to flow out in the Aerobic Pond is with CaCO
3Meter is not less than 75mg/L, and utilize the interior aeration mixing effect of Aerobic Pond to realize the short mix of molysite chemical agent and active sludge, the effect of alkaline matter be by in and molysite chemical agent acidic substance, avoid acidic substance that the molysite chemical agent contains to the damage influence of active sludge microorganism, the molysite chemical agent that adds and alkaline matter generation chemical reaction finally generate Fe (OH)
3, the molysite chemical agent that adds and alkaline matter total amount are finally controlled and are contained Fe amount reach 30～50mgFe/gMLVSS in making active sludge intermixture; Keep the original influent load condition of bio-denitrifying sewage system constant in culturing process, prolong active sludge mud age gradually, make 1～2 times that reaches design mud age of satisfying normal nitrated loading condiction, this culturing process required time is 10～20 days;
(2) the nitrification function microorganism culturing stage enters the active maintenance stage of long-time running of nitrification function microorganism after finishing, along with the formation of microorganism flco and chemical flco combination with stablize, reduce Fe gradually
3+Or Fe
2+The dosage of molysite chemical agent, the Fe that adds
3+Or Fe
2+The molysite chemical agent only be used for to replenish Fe
3+Or Fe
2+Number of dropouts, one liter of sewage Fe of every processing in the bio-denitrifying sewage system
3+Or Fe
2+Additional dosage be 1mg-2mg, this dosage is only as with excess sludge discharge loss Fe
3+Or Fe
2Replenish Fe in the bio-denitrifying sewage system that concrete dosage causes according to excess sludge discharge
3+Or Fe
2Number of dropouts is calculated, Fe
3+Or Fe
2+Chemical agent adds a little consistent with cultivation stage; This stage iron ion is got involved has the active sludge microorganism metabolic process of denitrification functions, strengthen iron ion and participate in electronics transfer function and the effect of enzymatic reaction activator, can effectively improve the biochemical reaction metabolic activity of microorganism, and the secretion of bacterial reproduction and enzyme had promoter action, form the nitrification function active sludge with higher biological metabolism activity thus.
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| CN102718346A (en) * | 2012-07-14 | 2012-10-10 | 哈尔滨工业大学 | Method for utilizing active sludge and Fe2(SO4)3 to perform combined treatment on domestic sewage |
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| CN114735808B (en) * | 2022-05-06 | 2023-08-11 | 青岛理工大学 | Method for quickly starting short-range nitrification of domestic sewage |
| CN115806371A (en) * | 2022-12-19 | 2023-03-17 | 中蓝连海设计研究院有限公司 | Biological denitrification method for high-salinity high-calcium epoxy propane wastewater |
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