CN105384320A - Method for improving sludge settling performance of nitrosation reactor - Google Patents
Method for improving sludge settling performance of nitrosation reactor Download PDFInfo
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- CN105384320A CN105384320A CN201510828661.8A CN201510828661A CN105384320A CN 105384320 A CN105384320 A CN 105384320A CN 201510828661 A CN201510828661 A CN 201510828661A CN 105384320 A CN105384320 A CN 105384320A
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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
- C02F11/00—Treatment of sludge; Devices therefor
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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
- C02F3/28—Anaerobic digestion processes
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Abstract
The invention discloses a method for improving the sludge settling performance of a nitrosation reactor. The method comprises the following steps: washing residual matrixes of nitrosation sludge with a phosphoric acid buffering solution and putting the sludge into a mixed solution containing bicarbonate (or carbonate) and a soluble calcium salt; stirring at a low uniform speed; adding the sludge into a continuous flow nitrosation reactor and gradually improving the concentration of the bicarbonate (or carbonate) of input water of the reactor; meanwhile, feeding a soluble calcium salt solution from the top of a reaction area to improve the density of the sludge floating at the top of the reaction area, enhance the settling performance of the sludge and relieve a condition that the sludge is lost along with output water, thereby improving the biomass in the reactor and finally improving the nitrosation performance of the reactor. According to the method provided by the invention, the nitrosation sludge settling performance in the reactor can be improved by 15 percent to 50 percent and the nitrosation performance of the reactor is improved by 2.5 to 5 times.
Description
Technical field
The present invention relates to wastewater biological denitrificaion technical field, particularly a kind of method improving nitrosation reactor sludge settling property.
Background technology
Nearly ten years, the industry development such as chemical industry, food is swift and violent, and for China's economic liftoff provides important support, but the ammonia nitrogen waste water that these industries are discharged brings great threat to China's ecological security of water environment, and environmental burst accident related to this takes place frequently.Country has put into effect series of measures, system, is intended to control water body ammonia and nitrogen pollution.Wherein, in " 12 " planning, ammonia nitrogen is classified as restrictive Con trolling index, becomes second restrictive Con trolling index in water pollution control after chemical oxygen demand (COD) (COD).Waste water nitrate pollution controls to be the great environmental protection subject realizing national environmental protection target and ensure social sustainable development.
Nitrosification is biological denitrification method ammonia oxidation being controlled in the nitrite stage by nitrite bacteria, owing to nitrite need not be further oxidized to nitrate, compared to traditional complete nitrification technique, can save the energy consumption of 25%.The more important thing is, nitrosifying water outlet can be used as the water inlet of follow-up anaerobic ammonia oxidation process, thus be combined into full autotrophic type biological denitrification process, be considered to the denitride technology of the characteristic of most Sustainable development so far, thus obtain extensive concern, be widely used in the process of municipal sewage sludge pressing filtering liquid, percolate and gourmet powder waste water etc.
But because ammonia oxidizing bacteria (AOB) is autotroph, grow relatively slow; Again because ammonium oxidation is nitrite by nitrifying process oxygen, aeration can cause air stream shear forces in reactor larger, be unfavorable for the formation of granule sludge, thus the nitrosification sludge settling property in reactor is not good, easily run off with water outlet, sludge concentration in reactor often maintains lower level, limits the further raising of nitrosation reactor performance.Therefore, under the prerequisite not affecting nitrosification Sludge Property in reactor, the settling property of nitrosification mud is improved by suitable method, nitrosification mud holding in reactor can be strengthened stay, reduce the probability that mud outflows with water, thus the sludge concentration in raising reactor, and then improve the nitrosification performance of reactor.
Based on above-mentioned thinking, first the present invention carries out precipitation of calcium carbonate attachment to nitrosification mud, be inoculated in reactor, progressively improve the inorganic carbon source concentration of water inlet of reactor, and add solubility calcium salts solution from top, the reaction zone stream of reactor, the inorganic carbon source that provide not only the abundance needed for ammonia oxidation bacteria is eased up punching performance, also successfully carbonate deposition is attached to nitrosification Sludge Surface, under the prerequisite of nitrosification sludge activity not affecting mud, significantly improve sludge settling property, thus the biomass added in reactor, improve the performance of nitrosation reactor.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of method improving nitrosation reactor sludge settling property is provided.
Improve a method for nitrosation reactor sludge settling property, comprise the following steps successively:
(1) nitrosification mud phosphoric acid buffer is rinsed;
(2) nitrosification mud is placed in the mixing solutions containing soluble calcium salt and supercarbonate or carbonate, keep dissolved oxygen in mixed solution, at the uniform velocity stir, make the lime deposit of generation be attached on mud, supernatant liquor is removed in standing hypsokinesis;
(3) at least repeating step (2) 1 times;
(4) the nitrosification mud after step (3) process is added Continuous Flow air lift type nitrosation reactor, from reactor bottom progressively improve reactor water inlet supercarbonate or carbonate concentration, add solubility calcium salts solution from the overhead stream of reactor reaction zone simultaneously, the lime deposit that reaction generates is attached to top Sludge Surface, with the settling property of reinforcement sludge, improve the sludge concentration in reactor, and then improve the nitrosification performance of reactor.
In step (1), nitrosification mud is rinsed with phosphoric acid buffer and remove surface impurity, so that the attachment of calcium carbonate.
Nitrosification mud described in step (1) is cotton-shaped, and particle diameter is less than 1mm, and density is less than 1.02g/mL.
Phosphate buffer density described in step (1) is 0.5 ~ 1mM, pH=7 ~ 8.
In step (2), nitrosification mud is placed in the mixing solutions containing soluble calcium salt and supercarbonate or carbonate by 1:1 ~ 5 by volume.
In step (2), soluble calcium salt comprises calcium chloride; Supercarbonate comprise in sodium bicarbonate, saleratus one or both, carbonate comprise in sodium carbonate, salt of wormwood one or both.
Containing solubility calcium salt concn in the mixing solutions of soluble calcium salt and supercarbonate or carbonate in step (2) is 0.005 ~ 0.02g/L, and the concentration of supercarbonate or carbonate is 2.5 ~ 5g/L.
Ammonia nitrogen concentration 100 ~ the 150mg/L in the mixing solutions of soluble calcium salt and supercarbonate or carbonate is contained, pH=7 ~ 8.5 in step (2).
Step (2) keeps dissolved oxygen 0.1 ~ 0.5mg/L in mixed solution, and at the uniform velocity stirring velocity is 5 ~ 20r/min, and churning time is 6 ~ 24h.
Continuous Flow air lift type nitrosation reactor aspect ratio described in step (4) is greater than 3:1; Supercarbonate in reactor water inlet or carbonate solution concentration are 2.5 ~ 14g/L, and solubility calcium salt concn is 0.1 ~ 0.5g/L, and solubility calcium salts solution remains 3.5 ~ 7mL/ (Ld) from the flow acceleration at top, reactor reaction zone.
Compared with prior art, the advantage that has of the present invention:
(1) the present invention adopts the mixing solutions of potassium-containing hydrogen salt (or carbonate) and soluble calcium salt to carry out pre-treatment to nitrosification mud, it is made to generate precipitation of calcium carbonate by the concentration controlling supercarbonate (or carbonate) and soluble calcium salt, and make part calcium carbonate precipitation be attached on mud by low at the uniform velocity stirring, thus when ensureing that calcium carbonate adhesion amount is unlikely to reduce sludge activity, improve the density of mud, strengthen the settling property of mud.
(2) pretreated nitrosification mud drops in nitrosation reactor by the present invention, keep higher hydraulic load, progressively promote supercarbonate (carbonate) concentration from reactor bottom simultaneously, provide not only the inorganic carbon source of abundance in reaction zone needed for ammonia oxidation bacteria, and improve the shock-absorbing capacity of solution, be conducive to promoting nitrosation reaction.
(3) the present invention adds solubility calcium salts solution from top, reaction zone stream, the precipitation of calcium carbonate of generation is made to be attached to the nitrosification mud on top, reaction zone, the settling property of this floating sludge can be improved, it is impelled to be back to reaction zone by sedimentation, alleviate its loss with water outlet, improve the biomass of reaction zone; On the active nitrosification mud that excess calcium carbonate simultaneously also can be avoided to be attached to bottom reaction zone, ensure that the nitrosification of mud is active.
Accompanying drawing explanation
Fig. 1 is the technical process of the method for raising nitrosation reactor sludge settling property of the present invention;
Fig. 2 is the reactor nitrosification performance adopting embodiments of the invention 1;
Fig. 3 is nitrosification mud (a) and throw out (b), SEM picture (c) and XRD figure spectrum (d) that adopt embodiments of the invention 2 to obtain.
Embodiment:
The invention will be further described by the following examples, and unrestricted the present invention.
Embodiment 1
Be the air lift type nitrosation reactor (volumetric loading 0.61kg/ (m of 8L by cubic capacity
3d), hydraulic detention time 15.9h, volume elimination capacity is 0.18kg/ (m
3d), reaction zone volume 4L) standing sedimentation, incline supernatant liquor, and taken out by reaction zone mud, recording mud median size is 0.1mm, and sludge density is 1.006g/mL.First the phosphoric acid buffer of 1mM (pH=7) is used to rinse 3 times, be placed on containing hydrogen-carbonate na concn 3.5g/L again, calcium chloride concentration 0.01g/L, in the mixing solutions (pH=7.5 ~ 7.9) of ammonia nitrogen concentration 100mg/L, the volume ratio of mud and mixing solutions is 1:1.5, keeps dissolved oxygen concentration in solution to be 0.2mg/L, stirring velocity 10r/min, stir 10h, precipitation leaves standstill hypsokinesis and removes supernatant liquor.After repeating above-mentioned steps again, pretreated nitrosification mud is dropped in former reactor, keep hydraulic detention time constant constant with volumetric loading, progressively the sodium bicarbonate concentration in water inlet is increased to 7g/L by 2.5g/L, the calcium chloride concentration of 0.2g/L is added from reaction zone overhead stream, flow acceleration controls as 4.4mL/ (Ld) by peristaltic pump, through the operation of 55d, successfully reactor volume load is risen to 0.45kg/ (m
3d), nitrite accumulation rate all the time higher than 85%, the nitrosification stable performance of reactor and efficient.Record reactor sludge concentration and be increased to 3.8gVSS/L by original 1.1gVSS/L, but VSS/SS is then reduced to 69% by original 80%, settling property SVI
3087mL/gVSS is reduced to by initial 102mL/gVSS.Experimental result shows, the settling property of nitrosification mud improves about 15%, and in reactor, biomass improves 3 times, and the nitrosification performance of reactor improves 2.5 times.
Embodiment 2
From certain 1m
3pilot reactor (volumetric loading 1.0kg/ (m
3d)) take out nitrosification mud, recording its sludge density is 1.01g/mL, and median size is 0.12mm, and mud nitrosification activity is 0.3kg/ (kgd), SVI
30for 87.9mL/g.First the phosphoric acid buffer of 1mM (pH=7) is used to rinse 3 times, be placed on containing concentration of sodium carbonate 4.0g/L again, calcium chloride concentration 0.02g/L, in the mixing solutions (pH=7.5 ~ 7.9) of ammonia nitrogen concentration 100mg/L, the volume ratio of mud and mixed solution is 1:1, dissolved oxygen concentration in solution is kept to be 0.2mg/L, stirring velocity 10r/min, stir 12h, precipitation leaves standstill hypsokinesis and removes supernatant liquor, again pretreated nitrosification mud is dropped into the air lift type nitrosation reactor of 8L, control influent ammonium concentration 350mg/L, dissolved oxygen concentration 0.2 ~ 0.5mg/L, progressively water inlet sodium bicarbonate concentration is increased to 14g/L, keep the stream rate of acceleration 4.4mL/ (Ld) at top, reaction zone calcium chloride solution (0.4g/L), 90% is greater than at maintenance ammonia clearance, when nitrite accumulation rate is greater than 80%, through the operation of nearly 200d, the hydraulic detention time of reactor can be foreshortened to 4.8h from 15h, the volumetric loading of reactor and volume elimination capacity are increased to 1.77 and 1.65kg/ (m respectively
3d).Record the SVI of mud
30be only 44.5mL/g, the settling property of mud improves about 1 times, observation finds that reactor wall is attached with pale precipitation, known its of precipitation taking-up XRD analysis is become and is mainly calcium carbonate, adopt scanning electron microscope (SEM) to observe Sludge Surface simultaneously and find that surperficial assisting has crystallisate, determine that precipitation of calcium carbonate is attached to mud and shows, thus significantly enhance the settling property of nitrosification mud, finally improve the nitrosification performance of reactor.
Claims (10)
1. improve a method for nitrosation reactor sludge settling property, it is characterized in that, comprise the following steps successively:
(1) nitrosification mud phosphoric acid buffer is rinsed;
(2) nitrosification mud is placed in the mixing solutions containing soluble calcium salt and supercarbonate or carbonate, keep dissolved oxygen in mixed solution, at the uniform velocity stir, make the lime deposit of generation be attached on mud, supernatant liquor is removed in standing hypsokinesis;
(3) at least repeating step (2) 1 times;
(4) the nitrosification mud after step (3) process is added Continuous Flow air lift type nitrosation reactor, from reactor bottom progressively improve reactor water inlet supercarbonate or carbonate concentration, add solubility calcium salts solution from the overhead stream of reactor reaction zone simultaneously, the lime deposit that reaction generates is attached to top Sludge Surface, with the settling property of reinforcement sludge, improve the sludge concentration in reactor, and then improve the nitrosification performance of reactor.
2. the method for raising nitrosation reactor sludge settling property according to claim 1, is characterized in that, is rinsed by nitrosification mud remove surface impurity, so that the attachment of calcium carbonate in step (1) with phosphoric acid buffer.
3. the method for raising nitrosation reactor sludge settling property according to claim 1, is characterized in that, the nitrosification mud described in step (1) is cotton-shaped, and particle diameter is less than 1mm, and density is less than 1.02g/mL.
4. the method for raising nitrosation reactor sludge settling property according to claim 1, is characterized in that, the phosphate buffer density described in step (1) is 0.5 ~ 1mM, pH=7 ~ 8.
5. the method for raising nitrosation reactor sludge settling property according to claim 1, is characterized in that, in step (2), nitrosification mud is placed in the mixing solutions containing soluble calcium salt and supercarbonate or carbonate by 1:1 ~ 5 by volume.
6. the method for raising nitrosation reactor sludge settling property according to claim 1, is characterized in that, in step (2), soluble calcium salt comprises calcium chloride; Supercarbonate comprise in sodium bicarbonate, saleratus one or both, carbonate comprise in sodium carbonate, salt of wormwood one or both.
7. the method for raising nitrosation reactor sludge settling property according to claim 1, it is characterized in that, containing solubility calcium salt concn in the mixing solutions of soluble calcium salt and supercarbonate or carbonate in step (2) is 0.005 ~ 0.02g/L, and the concentration of supercarbonate or carbonate is 2.5 ~ 5g/L.
8. the method for raising nitrosation reactor sludge settling property according to claim 1, it is characterized in that, ammonia nitrogen concentration 100 ~ the 150mg/L in the mixing solutions of soluble calcium salt and supercarbonate or carbonate is contained, pH=7 ~ 8.5 in step (2).
9. the method for the raising nitrosation reactor sludge settling property according to claim 1 or 5 or 6 or 7 or 8, it is characterized in that, step (2) keeps dissolved oxygen 0.1 ~ 0.5mg/L in mixed solution, and at the uniform velocity stirring velocity is 5 ~ 20r/min, and churning time is 6 ~ 24h.
10. the method for raising nitrosation reactor sludge settling property according to claim 1, is characterized in that, the Continuous Flow air lift type nitrosation reactor aspect ratio described in step (4) is greater than 3:1; Supercarbonate in reactor water inlet or carbonate solution concentration are 2.5 ~ 14g/L, and solubility calcium salt concn is 0.1 ~ 0.5g/L, and solubility calcium salts solution remains 3.5 ~ 7mL/ (Ld) from the flow acceleration at top, reactor reaction zone.
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2015
- 2015-11-25 CN CN201510828661.8A patent/CN105384320B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| JP2013505816A (en) * | 2009-09-28 | 2013-02-21 | グアンチョウ、ピュデ、エンバイロンメンタル、プロテクション、エキップメント、リミテッド | A method for integrating sewage sludge concentration-dehydration and aerobic air drying |
| CN102730910A (en) * | 2012-06-19 | 2012-10-17 | 常州大学 | Method for inhibiting expansion of anaerobic active sludge |
| CN103693734A (en) * | 2013-12-15 | 2014-04-02 | 北京工业大学 | Method for initiating nitrosification granular sludge for domestic sewage treatment |
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