CN102502950A - 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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- CN102502950A CN102502950A CN2011103406390A CN201110340639A CN102502950A CN 102502950 A CN102502950 A CN 102502950A CN 2011103406390 A CN2011103406390 A CN 2011103406390A CN 201110340639 A CN201110340639 A CN 201110340639A CN 102502950 A CN102502950 A CN 102502950A
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- 238000000034 method Methods 0.000 title claims abstract description 43
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- 230000000694 effects Effects 0.000 title claims abstract description 36
- 150000002500 ions Chemical class 0.000 title abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000010865 sewage Substances 0.000 claims abstract description 43
- 239000013043 chemical agent Substances 0.000 claims abstract description 36
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- 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
- 230000009471 action Effects 0.000 claims description 5
- 238000012545 processing Methods 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
- 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
- 241000108664 Nitrobacteria Species 0.000 description 6
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- 150000002823 nitrates Chemical class 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
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- 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
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- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
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- 229910002651 NO3 Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
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- 241000186361 Actinobacteria <class> Species 0.000 description 1
- 241000233866 Fungi Species 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
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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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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 nitrated ability of nitrated mikrobe under coldcondition in the active sludge that bio-denitrifying sewage handles, belong to technical field of sewage.
Background technology
Activated sludge process is a kind of bioremediation of sewage, is through the organism in the removal of microorganisms sewage in the active sludge, collaborative simultaneously a part of phosphorus element and the nitrogen removed.Traditional active sludge saprobiont 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 mikrobe 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 saprobiont denitride technology is on the traditional activated sludge process basis, to develop and next a kind of biological sewage denitrifying method, 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 through aminating reaction under the effect of Ammonifying bacteria; Original ammonia nitrogen in waste water; Under oxygen supply abundance and other conditions suitable; Under nitrated microbial process, be oxidized to nitric nitrogen (nitrite and nitrate salt) through nitration reaction, nitric nitrogen can be converted into harmless molecular state nitrogen through anti-nitration reaction under the denitrifying microorganism effect under oxygen free condition.Therefore, being nitrogen and entering in the atmosphere through the nitrogen transformation of above-mentioned reaction process with various forms in the sewage, also is the main purpose and the approach of present biological denitrificaion.
The bio-denitrifying sewage system is as shown in Figure 1, is made up of preliminary sedimentation tank, anoxic pond, Aerobic Pond, second pond, mixed solution internal circulation system, mud return-flow system etc.Sewage is earlier by the preliminary sedimentation tank deposition, 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 for active sludge microorganism enough oxygen to be provided in the Aerobic Pond.According to the technology changes of operating modes, can nitrate salt be back to anoxic pond through the mixed solution internal circulation system, also can nitrate salt be back to anoxic pond through the mud return-flow system; Anoxic pond is interior to be that nitrogen or gaseous nitrogen oxide are realized biological denitrificaion through 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 accomplished 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 accomplished by the heterotrophism denitrifying microorganism, and denitrifying microorganism belongs to amphimicrobe, and it has in anaerobic under the condition of nitrate salt existence, utilizes the N in nitrate salt 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 complicacy, it receives the influence of temperature of reaction, pH value, dissolved oxygen, inhibitory substance and carbon source capable of using.In general, as long as carbon source capable of using is sufficient, denitrification process can not become the restricted process that influences bio-denitrifying sewage yet.Yet for nitrifying process, it is accomplished through 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 salt with nitrite.Usually Nitrosomas and Nitromonas are referred to as nitrated mikrobe (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 accomplish the metabolism reaction.Owing to compare with peculiar mikrobe, 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 receives 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 mikrobe of participating in nitration reaction; The Nitrosomas optimum growth temp is 35 ℃, and the optimum growth temp of Nitromonas is 35～42 ℃, and the reduction of temperature of reaction not only causes the decline of the ratio rate of rise of nitrobacteria; Cause simultaneously the active reduction significantly of nitrobacteria to a greater extent, the reduction of nitrification activity directly causes the decline even the completely destroy of nitrated ability of treatment system and efficient.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, as far as bio-denitrifying sewage technology, not only have the denitrification operation stability problem, and low temperature influence problem to nitrated microorganism active and still do not have terms of settlement preferably at present, it also becomes the bottleneck problem that restricts the bio-denitrifying sewage technical development.
Summary of the invention
The present invention is directed to the problem of coldcondition, a kind of Fe ion (Fe that directly adds is provided the influence of nitrification function microorganism active
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; It is active to improve the nitrification function microbial biochemical reaction, improves 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 cultivation stage of nitrification function mikrobe and the active maintenance stage of long-time running of nitrification function mikrobe, and concrete implementation procedure is following:
(1) the nitrification function microorganism culturing stage:
Be in steady operational status or the nitrification function mikrobe has in the bio-denitrifying sewage system of normal nitrification function, with Fe in the nitrification function mikrobe
2+Or Fe
3+The molysite chemical agent (like concentration is 10%～20%FeCl
2Or FeSO
4Or concentration is 5%～15% FeCl
3) directly be added in the active sludge intermixture of biological denitrification system Aerobic Pond, dosage is controlled at active sludge intermixture and contains Fe
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, and 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 promptly, adding alkaline matter simultaneously (is 2%～5% Na like concentration
2CO
3Or NaHCO
3), the alkaline matter dosage guarantees that effusive active sludge intermixture basicity is with C in the Aerobic Pond
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 aeration mixing effect in the Aerobic Pond realize the short mix of molysite chemical agent and active sludge, the effect of alkaline matter be through in and molysite chemical agent acidic substance, avoid acidic substance that the molysite chemical agent contains damage influence to active sludge microorganism; Molysite chemical agent that adds and alkaline matter generation chemical reaction finally generate Fe (OH)
3, molysite chemical agent that adds and alkaline matter total amount finally are controlled to make and contain Fe amount in the active sludge intermixture and reach 30～50mgFe/gMLVSS; In culturing process, keep the original influent load condition of bio-denitrifying sewage system constant, 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 finishes the active maintenance stage of long-time running that the back gets into the nitrification function mikrobe, along with mikrobe 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 replenishing 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; The reinforced iron ion is participated in electron transport effect and the effect of enzymatic reaction activator; Can effectively improve the biochemical reaction metabolic activity of mikrobe; And the secretion of bacterial reproduction and enzyme had promoter action, form thus and have the active nitrification function active sludge of higher biological metabolism.
The present invention utilizes ferro element and active sludge microorganism through chemistry and biochemical keying action; The reinforced iron element is in intracellular electron transport effect of nitrobacteria and the effect of enzymatic stimulator; Can effectively improve the biochemical reaction metabolic activity of nitrated mikrobe; The murder by poisoning influence of excessive iron element to mikrobe avoided in the breeding of promotion nitrification function mikrobe and the secretion of microorganism cells endoenzyme simultaneously, formed thus to have the active nitrification function active sludge of higher biological metabolism.The invention solves cultivation problem and have the steady running problem of high reactivity nitrification function mikrobe with high reactivity nitrification function mikrobe; Realized that ferro element combines with the quick of active sludge; And utilize electron transport effect and the enzymatic reaction stimulator effect of ferro element in the nitrification function microorganism cells, make the nitrification function mikrobe 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 be employed in a spot of Fe that directly offers medicine in the biological denitrification system aerobic reaction process
3+Or Fe
2+Replaced for solving nitrated problem and added the nitrated mikrobe of various bio-carriers or artificial culture; Not only dosing method is simple and reliable; Convenient management, and investment and running cost are low is particularly suitable for the application of biological treatment of denitrogenation processing and poisonous and harmful, the indegradable industrial effluent of town sewage and the trade effluent with similar condition of water quality.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 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 through being provided with 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; Through combining of molysite chemistry flco and active sludge microorganism flco; The reinforced iron ion is participated in electron transport effect and the effect of enzymatic reaction activator; Not only effectively improve the biochemical reaction metabolic activity of mikrobe, 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 and further handle or discharge.
Method of the present invention comprises cultivation stage of nitrification function mikrobe and the active maintenance stage of long-time running of nitrification function mikrobe.
The concrete implementation procedure in nitrification function microorganism culturing stage is following:
For the bio-denitrifying sewage system; Guarantee that at first the nitrification function mikrobe is in steady operational status in the system; Or the nitrification function mikrobe 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 (like concentration is 10%～20%FeCl
2Or FeSO
4Or concentration is 5%～15% FeCl
3) directly be added in the active sludge intermixture of biological denitrification system Aerobic Pond, dosage is controlled at active sludge intermixture and contains Fe
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, and 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 promptly, adding certain density alkaline matter simultaneously (is 2%～5% Na like concentration
2CO
3Or NaHCO
3), the alkaline matter dosage guarantees that effusive active sludge intermixture basicity is with C in the Aerobic Pond
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 aeration mixing effect in the Aerobic Pond realize the short mix of molysite chemical agent and active sludge, the effect of alkaline matter be through in and molysite chemical agent acidic substance, avoid acidic substance that the molysite chemical agent contains damage influence to active sludge microorganism; Molysite chemical agent that adds and alkaline matter generation chemical reaction finally generate Fe (OH)
3, molysite chemical agent that adds and alkaline matter total amount finally are controlled to make and contain Fe amount in the active sludge intermixture and reach 30～50mgFe/gMLVSS; In culturing process, keep the original influent load condition of bio-denitrifying sewage system constant, 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 accomplishing the nitrification function mikrobe, get into the active maintenance stage of long-time running of nitrification function mikrobe.Along with mikrobe 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 (like 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 mikrobe by all means; Because iron is the important component part of cytopigment in the WWT microorganism biological oxydase system; It plays the electron transport effect in biological oxidation process, iron is again the important composition element of various coenzyme simultaneously, and 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, and the reinforced iron ion is participated in electron transport effect and the effect of enzymatic reaction activator, and it not only can effectively improve the biochemical reaction metabolic activity of mikrobe; And the secretion of bacterial reproduction and enzyme had certain promoter action, formed thus and had the active nitrification function active sludge of higher biological metabolism.
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, and the reinforced iron ion is participated in electron transport effect and the effect of enzymatic reaction activator, and it not only effectively improves the biochemical reaction metabolic activity of mikrobe; 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,, can generate different complex cation of electric charge or complex anion with the variation of the pH of system value (basicity).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 reinforcement active sludge, and it can be total to the effect of sinking with the oxyhydroxide generation of multiple metal, the heavy metal that removal influences some enzyme generation inhibition; Play the effect to shielding biological respinse enzyme inhibitors, the biochemical reaction of further strengthening active sludge is active.
Add the main technique design variable such as the following table of the biological denitrification system after iron ion fortified:
Through 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 the object of the invention, has received the ideal 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 cultivation stage of nitrification function mikrobe and the active maintenance stage of long-time running of nitrification function mikrobe, and it is characterized in that: concrete implementation procedure is following:
(1) the nitrification function microorganism culturing stage:
Be in steady operational status or the nitrification function mikrobe has in the bio-denitrifying sewage system of normal nitrification function, with Fe in the nitrification function mikrobe
2+Or Fe
3+The molysite chemical agent directly be added in the active sludge intermixture of biological denitrification system Aerobic Pond, dosage is controlled at active sludge intermixture and contains Fe
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 promptly, add alkaline matter simultaneously, the alkaline matter dosage guarantees that effusive active sludge intermixture basicity is with C in the Aerobic Pond
aCO
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 through in molysite chemical agent acidic substance; Avoid acidic substance that the molysite chemical agent the contains damage influence to active sludge microorganism, molysite chemical agent that adds and alkaline matter generation chemical reaction finally generate Fe (OH)
3, molysite chemical agent that adds and alkaline matter total amount finally are controlled to make and contain Fe amount in the active sludge intermixture and reach 30～50mgFe/gMLVSS; In culturing process, keep the original influent load condition of bio-denitrifying sewage system constant, 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 finishes the active maintenance stage of long-time running that the back gets into the nitrification function mikrobe, along with the formation of mikrobe 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 replenishing 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; The reinforced iron ion is participated in electron transport effect and the effect of enzymatic reaction activator; Can effectively improve the biochemical reaction metabolic activity of mikrobe; And the secretion of bacterial reproduction and enzyme had promoter action, form thus and have the active nitrification function active sludge of higher biological metabolism.
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| CN114735808A (en) * | 2022-05-06 | 2022-07-12 | 青岛理工大学 | Method for quickly starting short-cut nitrification of domestic sewage |
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