CN115140835A - Denitrification synergist, modified activated sludge and nitrification tank denitrification synergism method - Google Patents
Denitrification synergist, modified activated sludge and nitrification tank denitrification synergism method Download PDFInfo
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- 229910052901 montmorillonite Inorganic materials 0.000 claims abstract description 58
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- 239000010949 copper Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 4
- 229910052700 potassium Inorganic materials 0.000 claims description 4
- 239000011591 potassium Substances 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
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- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 2
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- 150000001340 alkali metals Chemical class 0.000 claims description 2
- 150000003841 chloride salts Chemical class 0.000 claims description 2
- 230000002708 enhancing effect Effects 0.000 claims description 2
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 2
- 229910052723 transition metal Inorganic materials 0.000 claims description 2
- 150000003624 transition metals Chemical class 0.000 claims description 2
- 239000003623 enhancer Substances 0.000 claims 5
- 239000000203 mixture Substances 0.000 claims 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 42
- 230000008569 process Effects 0.000 description 13
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
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- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
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- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 description 1
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- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
- C02F3/107—Inorganic materials, e.g. sand, silicates
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1226—Particular type of activated sludge processes comprising an absorbent material suspended in the mixed liquor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- 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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Microbiology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a denitrification synergist, modified activated sludge thereof and a denitrification synergism method for a nitrification tank. The denitrification synergist is montmorillonite-trace element-water combined liquid; adding montmorillonite and trace element salt into water and carrying out aeration treatment for a period of time, or adding a water solution of montmorillonite and trace element salt into water and carrying out aeration treatment for a period of time, then standing for layering, and obtaining the montmorillonite-trace element-water combined liquid on the lower layer. The modified activated sludge is obtained by performing mixed culture on the denitrification synergist and the activated sludge to combine the activated sludge and the denitrification synergist. The denitrification synergistic method of the nitrification tank comprises the steps of preparing montmorillonite-trace element-water combined liquid from montmorillonite, trace elements and water; then the sludge is put into an aeration tank, so that the activated sludge in the aeration tank is combined with the synergist to realize modification, namely the denitrification synergism of the nitrification tank is realized.
Description
Technical Field
The invention relates to a sewage denitrification treatment technology, in particular to a nitrifying bacteria denitrification synergist, modified activated sludge and an aeration tank denitrification synergy method.
Background
Methods for treating wastewater generally include physical treatment, chemical treatment and biological treatment. The biological treatment method is a wastewater treatment method which converts organic pollutants in the state of solution, colloid and fine suspended matters in wastewater into stable and harmless substances through the metabolism of microorganisms. The biological treatment methods are further classified into anaerobic and aerobic treatment methods for degrading organic pollutants, advanced nitrogen and phosphorus removal methods, and the like according to the difference of acting microorganisms. Among them, biological denitrification treatment is the main body of most wastewater treatment and is also a difficult point. The biological denitrification treatment refers to a process of converting ammonia nitrogen into nitrate by nitrifying bacteria under an aerobic condition (nitrification process), and reducing the nitrate into nitrogen by denitrifying bacteria under an anaerobic condition (denitrification process) so as to completely remove nitrogen. In the treatment of the high ammonia nitrogen wastewater, the nitration process is the main speed-limiting step. In addition, the severe fluctuation of the ammonia nitrogen level in the nitrification tank, the change of the environmental temperature, the change of the aeration quantity and the change of PH are easy to cause the instability of the nitrified sludge, and the water treatment efficiency is easy to be greatly influenced. Therefore, how to keep the stability of the nitrified sludge in the digestion aeration tank and the stability of the denitrification efficiency when the conditions are changed in the denitrification reaction is an important link in the current sewage treatment process.
Disclosure of Invention
The invention aims to provide a denitrification synergist used for a nitrification tank in a sewage and wastewater treatment process, modified activated sludge obtained by modifying activated nitrification sludge by using the denitrification synergist, and a method for performing denitrification synergism on the nitrification tank by using the denitrification synergist, and solves the problems that the existing nitrification Chi Kangan has poor nitrogen load impact capacity and the activated sludge is easy to destabilize due to environmental change.
The purpose of the invention is realized according to the following technical scheme:
one embodiment of the application is a denitrification synergist, which is prepared by adding montmorillonite and trace element salt into water and carrying out aeration treatment for a period of time, or adding an aqueous solution of montmorillonite and trace element salt into water and carrying out aeration treatment for a period of time, then standing for layering, and obtaining montmorillonite-trace element-water combined liquid serving as a denitrification synergist at the lower layer; the microelement salt at least comprises EDTA metal salt, and the metal element in the EDTA metal salt can be alkali metal, rare earth element or transition metal.
Further, an embodiment of the present application is, every 1m 3 In water, the feeding amount of the montmorillonite is 40-80kg; the dosage of the trace element salt is 6-10L of 7-8wt% trace element water solution or 400-800g of trace element salt.
In one embodiment of the present application, the metal element in the metal salt of EDTA is preferably a metal element that can act as an active center of an enzyme, including but not limited to one or more of sodium, potassium, zinc, calcium, manganese, iron, copper, and cobalt.
In one embodiment of the present application, the trace element salt may further include other types of water-soluble salts of at least one metal element not limited to sodium, potassium, zinc, calcium, manganese, iron, copper, cobalt; the water soluble salts include but are not limited to sulfate, chloride salts.
In one embodiment of the present application, the trace element salt may further comprise (NH) 4 ) 6 Mo 7 O 24 ·4H 2 O。
One embodiment of the present application is that the trace element salt is composed of the following components by weight: EDTAH 2 Na 2 ·2H 2 O 65-75％、ZnSO 4 ·7H 2 O 1-5％、CaCl 2 5-10％、MnCl 2 ·4H 2 O 5％-10％、FeSO 4 ·7H 2 O 5％-10％、(NH 4 ) 6 Mo 7 O 24 ·4H 2 O 1％-3％、CuSO 4 ·5H 2 O 1％-4％、CoSO 4 ·7H 2 O 2％-4％。
The second purpose of the invention is to provide a modified activated sludge, which is implemented according to the following technical scheme:
one embodiment of the present application is a modified activated sludge, which is obtained by subjecting the denitrification synergist and the activated sludge to mixed culture, combining the activated sludge with the denitrification synergist, reforming sludge into flocs, and obtaining a modified activated sludge with an SVI value of about 100ml/g SS.
According to the embodiment of the application, the high adsorption capacity and the high ion exchange capacity of the micron-sized dioctahedral crystal montmorillonite are used as the active sludge modification active filler, so that the active sludge modification active filler is tightly combined with EPS secreted by nitrifying bacteria in the nitrification process to form montmorillonite-nitrifying sludge.
The third purpose of the application is to provide a denitrification synergistic method of a nitrification tank, which is implemented according to the following technical scheme:
one embodiment of the present application is a nitrification tank denitrification efficiency enhancement method, which comprises the following steps:
1) Dissolving the trace element salt in water according to the proportion of 7-8wt%, and adjusting the pH value to 5.5-6.5;
2) Setting a pretreatment tank, putting the water solution of montmorillonite and trace element salt into water in the pretreatment tank, continuously aerating for at least 24h, standing for layering, obtaining montmorillonite colloid on the upper layer, and obtaining montmorillonite-trace element-water combined liquid on the lower layer;
in the step, the feeding ratio is montmorillonite, the water solution of trace element salt and water =40-80 kg: 6-10L: 1m 3 ；
3) Taking the lower layer montmorillonite-microelement-water combined liquid, putting into an aeration tank, and combining the activated sludge in the aeration tank with a synergist to realize modification, namely realizing denitrification synergy of the nitrification tank.
In a further embodiment of the application, in the step 2), the ratio of the feeding volume of the montmorillonite-trace element-water combined liquid to the volume of the activated sludge in the aeration tank is 2-5: 1.
In a more specific embodiment of the application, the montmorillonite colloid obtained in the step 2) is recycled, and is put into the pretreatment tank again, and the montmorillonite and the trace element salt are supplemented in proportion, then continuous aeration treatment is carried out again, the montmorillonite colloid on the upper layer is recycled, and the montmorillonite-trace element-water combined liquid serving as the denitrification synergist on the lower layer is continuously used for denitrification synergism of the nitrification tank.
According to the technical scheme, montmorillonite is used for adsorbing and exchanging metal ions in trace element salt, and can be modified during combination, so that the montmorillonite has better binding property and adsorbability during subsequent combination with activated sludge, and can be used as a support carrier of the activated sludge and provide metal ion stimulator activity. According to the technical scheme, the montmorillonite is pretreated by using trace elements, and the prepared denitrification synergist has the effects of better increasing the stability and activity of activated sludge and promoting the growth and reproduction of nitrifying bacteria by adding EDTA into EDTA metal salt, so that the nitrifying bacteria in the aeration tank have stronger high ammonia nitrogen load impact resistance and the capacity of coping with the condition change of the aeration tank. Compared with the prior art, the system added with the modified montmorillonite sludge has higher denitrification efficiency and is more stable, which shows that the modified montmorillonite sludge has higher nitrification efficiency and more stable structure.
After the synergist prepared by the invention is combined with activated sludge, the forming rate of sludge flocs and the ion exchange rate of the sludge can be increased, so that the environment change resistance of the sludge, such as high ammonia nitrogen load impact or aeration change, can be increased. In general, the synergist prepared by the invention is used as a modifier for denitrogenation by an activated sludge process, and can improve the treatment efficiency and the tolerance degree of sludge maximally.
In addition, from the cost perspective, china is a large-storage country of bentonite, accounting for 60% of the world bentonite storage, and montmorillonite is the main component of bentonite, so montmorillonite is selected as a micron-sized active filler, and the micron-sized active filler has the advantages of low manufacturing cost, wide applicability, easily available raw materials and the like. And montmorillonite is a mineral, has the advantages of good expansibility, adsorptivity, cation exchange property, suspension property, cohesiveness, stability, nontoxicity and the like, and is very suitable for being used as a biological filler.
Drawings
FIG. 1 is a flow chart of a denitrification enhancing process of a nitrification tank.
FIG. 2 is a graph comparing the ammonia nitrogen content of inlet and outlet water of modified activated sludge and common activated sludge.
FIG. 3 is a graph comparing ammonia nitrogen removal rates of modified activated sludge and common activated sludge
FIG. 4 is a graph comparing the ammonia nitrogen removal rates of modified activated sludge and common activated sludge directly added with montmorillonite and trace elements.
Detailed Description
The technical solution of the present application is further described in detail by the following specific examples.
The montmorillonite used in the embodiments of the present application is a micron-sized dioctahedral crystal montmorillonite.
Example 1
1) Weighing and mixing the trace element salts according to the following proportion, then weighing 75g of mixed salt, dissolving the mixed salt in 1L of water, and adjusting the pH of the system to 6 by using KOH to obtain a water solution of the trace element salt;
EDTAH 2 Na 2 ·2H 2 O 70％、ZnSO 4 ·7H 2 O 3％、CaCl 2 6.5％、MnCl 2 ·4H 2 O 6.5％、FeSO 4 ·7H 2 O 6.5％、(NH 4 ) 6 Mo 7 O 24 ·4H 2 O 2％、CuSO 4 ·5H 2 O 2.5％、CoSO 4 ·7H 2 O 3％。
2) As shown in the flow chart of figure 1, a pretreatment tank is arranged at the front end of a nitrification tank (aeration tank), and according to the effective tank volume of the pretreatment tank, dioctahedral crystal montmorillonite and trace element salt water solution are added into the pretreatment tank; the addition amount of montmorillonite is 6 mass percent of the effective water capacity of the pretreatment tank, and the addition amount of the trace element aqueous solution is 0.8 volume percent of the effective water capacity of the pretreatment tank.
3) Adding water into the pretreatment tank to the effective tank volume of the pretreatment tank, then carrying out aeration pretreatment on the montmorillonite for 24 hours according to the ventilation quantity of 1V/(V.min), then standing and layering, and completing montmorillonite pretreatment when the liquid in the tank becomes montmorillonite colloid/montmorillonite-trace element-water combined liquid.
4) According to V Montmorillonite-trace element-water combined liquid ∶V Activated sludge And (5) = 3.5: 1, taking the montmorillonite-trace element-water combined solution in the pretreatment tank, injecting the montmorillonite-trace element-water combined solution into an aeration tank, and carrying out mixed culture on the montmorillonite-trace element-water combined solution and sludge in the tank in the aeration tank to combine the sludge in the tank with the montmorillonite (namely, the sludge forms larger flocs again, and the SVI value is about 100ml/g SS) to form the montmorillonite modified activated sludge.
5) The modified activated sludge is subjected to nitrification and denitrification reaction in the aeration tank, so that the denitrification efficiency of the nitrification tank is improved.
In the actual operation process, according to the water inlet and outlet flow of the aeration tank, the montmorillonite-trace element-water combined liquid is continuously added into the aeration tank according to the feeding proportion.
Example 2
1) Weighing and mixing the trace element salts according to the following proportion, then weighing 70g of mixed salt, dissolving in 1L of water, and adjusting the pH of the system to 6.5 by using KOH to obtain the trace element aqueous solution.
EDTAH 2 Na 2 ·2H 2 O 65％、ZnSO 4 ·7H 2 O 1％、CaCl 2 10％、MnCl 2 ·4H 2 O 6％、FeSO 4 ·7H 2 O 10％、(NH 4 ) 6 Mo 7 O 24 ·4H 2 O 3％、CuSO 4 ·5H 2 O 1％、CoSO 4 ·7H 2 O 4％。
2) A pretreatment tank is arranged at the front end of the nitrification aeration tank, and dioctahedral crystal montmorillonite and trace element aqueous solution are added into the tank according to the effective tank volume of the pretreatment tank; the addition amount of montmorillonite is 8% of the effective water capacity of the pretreatment tank by mass ratio, and the addition amount of the trace element aqueous solution is 1% of the effective water capacity of the pretreatment tank by volume ratio.
3) Adding water into the pretreatment tank to the effective tank volume of the pretreatment tank, then carrying out aeration pretreatment on the montmorillonite for 36 hours according to the ventilation quantity of 1V/(V.min), then standing and layering, and completing montmorillonite pretreatment when the liquid in the tank becomes montmorillonite colloid/montmorillonite-trace element-water combined liquid.
4) In volume ratio V Montmorillonite-trace element-water combined liquid ∶V Activated sludge And (5) taking the montmorillonite-trace element-water combined liquid in the pretreatment tank, injecting the montmorillonite-trace element-water combined liquid into an aeration tank, and carrying out mixed culture on the montmorillonite-trace element-water combined liquid and the sludge in the tank in the aeration tank to combine the activated sludge in the tank with the montmorillonite to form the activated sludge modified by the montmorillonite.
5) The modified activated sludge is subjected to nitrification and denitrification reaction in the aeration tank, so that the denitrification efficiency of the nitrification tank is improved.
In the actual operation process, the montmorillonite-trace element-water combined liquid is added into the aeration tank according to the feeding proportion according to the water inlet and outlet flow of the aeration tank.
Example 3
1) Weighing and mixing the trace element salts according to the following proportion, then weighing 80g of mixed salt, dissolving in 1L of water, and adjusting the pH of the system to 5.5 by using KOH to obtain the trace element aqueous solution.
EDTAH 2 Na 2 ·2H 2 O 73％、ZnSO 4 ·7H 2 O 5％、CaCl 2 6％、MnCl 2 ·4H 2 O 6％、FeSO 4 ·7H 2 O 5％、(NH 4 ) 6 Mo 7 O 24 ·4H 2 O 1％、CuSO 4 ·5H 2 O 2％、CoSO 4 ·7H 2 O 2％。
2) A pretreatment tank is arranged at the front end of the nitrification aeration tank, and dioctahedral crystal montmorillonite and trace element aqueous solution are added into the tank according to the effective tank volume of the pretreatment tank; the addition amount of montmorillonite is 4% of the effective water capacity of the pretreatment tank by mass, and the addition amount of trace element aqueous solution is 0.6% of the effective water capacity of the pretreatment tank by volume.
3) Adding water into the pretreatment tank to the effective tank volume of the pretreatment tank, then carrying out aeration pretreatment on the montmorillonite for 48 hours under the condition of the air flow of 1V/(V.min), then standing for layering, and completing the pretreatment of the montmorillonite when the liquid in the tank becomes montmorillonite colloid/montmorillonite-trace element-water combined liquid which is layered.
4) According to V Montmorillonite-trace element-water combined liquid ∶V Activated sludge And (5) = 5: 1, taking the montmorillonite-trace element-water combined solution in the pretreatment tank, injecting the montmorillonite-trace element-water combined solution into an aeration tank, and carrying out mixed culture on the montmorillonite-trace element-water combined solution and the sludge in the tank in the aeration tank to combine the sludge in the tank with the montmorillonite to form the montmorillonite modified activated sludge.
5) The modified activated sludge is subjected to nitrification and denitrification reaction in the aeration tank, so that the denitrification efficiency of the nitrification tank is improved.
In the actual operation process, the montmorillonite-trace element-water combined liquid is added into the aeration tank according to the feeding proportion according to the water inlet and outlet flow of the aeration tank.
Example 4
In contrast to example 1, in this example, the trace element salt of step 1) is EDTA disodium salt EDTAH alone 2 Na 2 ·2H 2 O, in an amount of 70g.
Example 5
In this example, the salt of the trace element in step 1) was EDTAH, as opposed to example 1 2 Na 2 ·2H 2 O 75％、MnCl 2 ·4H 2 O 10％、FeSO 4 ·7H 2 O 10％、CuSO 4 ·5H 2 O5%, the addition amount is 70g.
Experimental example 1 high Ammonia Nitrogen load impact experiment-modified activated sludge
1) Montmorillonite-trace element-water combined liquid is prepared according to the component proportion of example 1, and mixed culture is carried out on the montmorillonite-trace element-water combined liquid and common activated sludge according to the volume ratio of 3.5: 1, so that the activated sludge is combined with the montmorillonite to form modified montmorillonite sludge.
2) The modified montmorillonite sludge is connected into an aeration cylinder, and the effective volume is 700mL.
3) And introducing 500mL of simulated ammonia nitrogen wastewater every day, gradually increasing the ammonia nitrogen concentration of the inflow simulated ammonia nitrogen wastewater along with the increase of the culture time (see an inflow ammonia nitrogen curve of an experimental group in figure 2), adding a binding solution in proportion, aerating for 24 hours, discharging 500mL of liquid, and detecting the ammonia nitrogen level of the discharged water (see an outflow ammonia nitrogen curve of the experimental group in figure 2).
Comparative example 1 high ammonia nitrogen load impact experiment-ordinary activated sludge
1) And (3) putting the common activated sludge into an aeration bottle, wherein the effective volume is 700mL.
2) And introducing 500mL of simulated ammonia nitrogen wastewater every day, gradually increasing the ammonia nitrogen concentration of the inflow ammonia nitrogen wastewater along with the increase of the culture time (see the inflow ammonia nitrogen curve of the control group in figure 2), aerating for 24 hours, discharging 500mL of liquid, and detecting the ammonia nitrogen level of the outlet water (see the outlet ammonia nitrogen curve of the control group in figure 2).
In addition, the ammonia nitrogen removal rates of experimental example 1 and comparative example 1 were measured, respectively, and the results are shown in fig. 3 to determine the denitrification efficiency in both systems.
As can be seen from figures 2 and 3, the activated sludge modified by the synergist according to the technical scheme of the application has stronger ammonia nitrogen load impact resistance compared with common activated sludge, and an experimental group has higher ammonia nitrogen removal rate under the condition of continuously improving the ammonia nitrogen load of inlet water. The ammonia nitrogen removal rate of the experimental group is basically maintained above 99% (except for the seventh day), while the ammonia nitrogen removal rate of the control group shows a decreasing trend along with the increase of the load. This shows that the ammonia nitrogen load impact resistance of the modified activated sludge is enhanced and the sludge stability is increased after the common activated sludge is modified by the method. According to multiple experimental researches, the synergist disclosed by the invention has the advantages that the denitrification promoting efficiency is 10% -40%, and the synergist can resist the high ammonia nitrogen load impact of 1700 mg/L.
Experimental example 2 high Ammonia Nitrogen load impact-modified activated sludge
1) Taking the montmorillonite-trace element-water binding solution prepared in the example 1, and carrying out mixed culture with common activated sludge according to the volume ratio of 5: 1, so that the activated sludge is combined with montmorillonite to form modified montmorillonite sludge.
2) The modified montmorillonite sludge is connected into an aeration cylinder, and the effective volume is 700mL.
3) And introducing 500mL of simulated ammonia nitrogen wastewater every day, gradually increasing the ammonia nitrogen concentration of the inflow ammonia nitrogen wastewater along with the increase of the culture time, simultaneously adding the binding solution in proportion, and discharging 500mL of solution after aerating for 24 h.
Comparative example 2 high ammonia nitrogen load impact-common activated sludge + montmorillonite + trace elements
1) Montmorillonite and trace elements are respectively weighed according to the feeding proportion of experimental example 2, and are simultaneously connected into an aeration cylinder with common activated sludge, and the effective volume is 700mL.
2) And introducing 500mL of simulated ammonia nitrogen wastewater every day, adding montmorillonite and trace elements in proportion, and discharging 500mL of liquid after aerating for 24 hours.
The ammonia nitrogen removal rates of the two groups were measured and recorded for experimental example 2 and comparative example 2, respectively, and the results are shown in fig. 4, where experimental example 2 corresponds to the experimental group removal rate curve and comparative example 2 corresponds to the control group removal rate curve in fig. 4.
As can be seen from FIG. 4, in the comparative experiment, the ammonia nitrogen removal rate of the experimental group (i.e., experimental example 2) showed an upward trend after short-term fluctuation, and the average removal rate was about 80%. In contrast, in the control group (i.e., comparative example 2), the trace elements were directly fed into the aeration tank, and the retention time was very short, the trace elements were immediately dissolved in water and then discharged, and the montmorillonite and trace elements could not be well bound to the sludge, and the ammonia nitrogen removal rate was only about 40% after stabilization. The method of the invention is adopted to prepare montmorillonite-trace element-water combined liquid, and then the montmorillonite-trace element-water combined liquid can be combined with the activated sludge to realize modification, and the aim of combining and modifying the activated sludge by the montmorillonite can not be realized by directly putting the montmorillonite and the trace elements into an aeration tank.
The present application describes the technical solutions and effects of the present application in detail through preferred embodiments of examples 1 to 3 and corresponding experimental examples 1 and 2 and comparative examples 1 and 2. On the basis, as in examples 4 and 5, the types of the added trace elements can be properly adjusted within the scope of the claims, and the prepared denitrification synergist also has the effects of increasing the ammonia nitrogen load impact resistance of the nitrification aeration tank and keeping the sludge stability when the aeration amount changes, and has better experimental effects compared with the effect of directly feeding the montmorillonite and the trace elements in the same proportion into an aeration bottle.
The technical scheme of the invention is an improvement scheme aiming at the combination form and the denitrification efficiency of aerobic nitrification activated sludge in the biological denitrification technical treatment process of sewage and wastewater, and comprises but is not limited to the improvement of the denitrification efficiency of the sludge aiming at high ammonia nitrogen volume load, the maintenance of stable denitrification efficiency when the aeration quantity changes and the instability recovery under the impact of high ammonia nitrogen load. The objects of the present invention can be achieved and substantially equivalent technical effects can be achieved for the possible embodiments not enumerated in the above examples and included in the scope of the claims.
Claims (9)
1. A denitrification synergist is characterized in that montmorillonite and trace element salt are added into water and are aerated for a period of time, or an aqueous solution of montmorillonite and trace element salt is added into water and is aerated for a period of time, then the mixture is kept stand for layering, and a montmorillonite-trace element-water combined liquid serving as a denitrification synergist is obtained on the lower layer; the microelement salt at least comprises EDTA metal salt, and the metal element in the EDTA metal salt can be alkali metal, rare earth element or transition metal.
2. The denitrification enhancer according to claim 1, wherein each 1m 3 In water, the feeding amount of the montmorillonite is 40-80kg; the feeding amount of the trace element salt is 6-10L of trace element water solution with the concentration of 7-8wt% or 400-800g of trace element salt.
3. The denitrification enhancer of claim 2, wherein said metallic elements include, but are not limited to, one or more of sodium, potassium, zinc, calcium, manganese, iron, copper, cobalt.
4. The denitrification enhancer as claimed in claim 2, wherein the trace element salt further comprises other types of water-soluble salts of at least one metal element not limited to sodium, potassium, zinc, calcium, manganese, iron, copper, cobalt; the water soluble salts include but are not limited to sulfate, chloride salts.
5. The denitrification enhancer as set forth in claim 2,characterized in that the trace element salt may further comprise (NH) 4 ) 6 Mo 7 O 24 ·4H 2 O。
6. The denitrification enhancer as claimed in claim 2, wherein the trace element salt comprises the following components in parts by weight: EDTAH 2 Na 2 ·2H 2 O 65-75％、ZnSO 4 ·7H 2 O 1-5％、CaCl 2 5-10％、MnCl 2 ·4H 2 O 5％-10％、FeSO 4 ·7H 2 O 5％-10％、(NH 4 ) 6 Mo 7 O 24 ·4H 2 O 1％-3％、CuSO 4 ·5H 2 O 1％-4％、CoSO 4 ·7H 2 O 2％-4％。
7. The modified activated sludge is characterized in that the modified activated sludge is obtained by performing mixed culture on the denitrification synergist and the activated sludge to combine the activated sludge and the denitrification synergist.
8. A denitrification synergistic method for a nitrification tank is characterized by comprising the following steps:
1) Dissolving the trace element salt in water according to the proportion of 7-8wt%, and adjusting the pH value to 5.5-6.5;
2) Setting a pretreatment tank, putting the water solution of montmorillonite and trace element salt into water in the pretreatment tank, continuously aerating for at least 24h, standing for layering, obtaining montmorillonite colloid on the upper layer, and obtaining montmorillonite-trace element-water combined liquid on the lower layer;
in the step, the feeding ratio is montmorillonite, the water solution of trace element salt and water =40-80 kg: 6-10L: 1m 3 ；
3) Taking the lower layer montmorillonite-trace element-water combined liquid, putting the lower layer montmorillonite-trace element-water combined liquid into an aeration tank, and combining activated sludge in the aeration tank with a synergist to realize modification, namely realizing denitrification synergism of a nitrification tank.
9. The method for enhancing the nitrification Chi Tuodan efficiency according to claim 8, wherein in the step 2), the ratio of the feeding volume of the montmorillonite-trace element-water combined liquid to the volume of the activated sludge in the aeration tank is 2-5: 1.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101045578A (en) * | 2006-03-29 | 2007-10-03 | 中国石化上海石油化工股份有限公司 | Method for removing sewage aminonitrogen by activated sludge process |
| CN108975494A (en) * | 2018-09-04 | 2018-12-11 | 燕山大学 | A kind of method of the black smelly water of graphene modified straw material processing |
| CN108996885A (en) * | 2018-08-27 | 2018-12-14 | 华南理工大学 | A kind of montmorillonite type oxidized sludge dehydrating agent and its preparation method and application |
| CN113564153A (en) * | 2021-07-21 | 2021-10-29 | 北京恩菲环保股份有限公司 | Immobilized biocatalyst and preparation method and application thereof |
| CN114317516A (en) * | 2022-01-05 | 2022-04-12 | 江苏利然环保科技有限公司 | Composite microbial inoculum for wastewater treatment and preparation method thereof |
-
2022
- 2022-06-28 CN CN202210750203.7A patent/CN115140835A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101045578A (en) * | 2006-03-29 | 2007-10-03 | 中国石化上海石油化工股份有限公司 | Method for removing sewage aminonitrogen by activated sludge process |
| CN108996885A (en) * | 2018-08-27 | 2018-12-14 | 华南理工大学 | A kind of montmorillonite type oxidized sludge dehydrating agent and its preparation method and application |
| CN108975494A (en) * | 2018-09-04 | 2018-12-11 | 燕山大学 | A kind of method of the black smelly water of graphene modified straw material processing |
| CN113564153A (en) * | 2021-07-21 | 2021-10-29 | 北京恩菲环保股份有限公司 | Immobilized biocatalyst and preparation method and application thereof |
| CN114317516A (en) * | 2022-01-05 | 2022-04-12 | 江苏利然环保科技有限公司 | Composite microbial inoculum for wastewater treatment and preparation method thereof |
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