CN105384320B - A method of improving nitrosation reactor sludge settling property - Google Patents
A method of improving nitrosation reactor sludge settling property Download PDFInfo
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- CN105384320B CN105384320B CN201510828661.8A CN201510828661A CN105384320B CN 105384320 B CN105384320 B CN 105384320B CN 201510828661 A CN201510828661 A CN 201510828661A CN 105384320 B CN105384320 B CN 105384320B
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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 kind of methods improving nitrosation reactor sludge settling property.First the matrix of nitrosation sludge remnants is cleaned with phosphate buffer, then sludge is placed in potassium-containing hydrogen salt (or carbonate) and soluble calcium salt mixed liquor, low at the uniform velocity stir, continuous flow nitrosation reactor is put into again, step up water inlet bicarbonate (or carbonate) concentration of reactor, stream plus solubility calcium salting liquid at the top of reaction zone simultaneously, to improve the density for floating on sludge at the top of reaction zone, enhance the settling property of sludge, alleviate sludge to be lost in water outlet, to promote the biomass in reactor, the final nitrosation performance for promoting reactor.Nitrosation sludge settling property in reactor can be improved 15%~50% by the present invention, and the nitrosation performance of reactor improves 2.5~5 times.
Description
Technical field
The present invention relates to wastewater biological denitrificaion technical field, more particularly to a kind of raising nitrosation reactor sludge settling
The method of energy.
Background technology
Nearly ten years, the industry developments such as chemical industry, food are swift and violent, and important support, but these are provided for China's economic liftoff
The ammonia nitrogen waste water that industry is discharged brings great threat, environmental burst accident related to this to China's ecological security of water environment
It takes place frequently.Country has put into effect a series of measures, system, it is intended to control ammonia nitrogen pollution in water body.Wherein, by ammonia in " 12th Five-Year Plan " planning
Nitrogen is classified as restrictive Con trolling index, becomes after second restrictive control in COD (COD) afterwards water pollution control
Index.The control of waste water nitrate pollution is the great environmental protection subject realized national environmental protection target and ensure social sustainable development.
Nitrosation is the biological denitrification method by ammoxidation control in the nitrite stage by nitrite bacteria, due to nothing
Nitrite must be further oxidized to nitrate, for traditional complete nitrification technique, 25% energy consumption can be saved.More
Importantly, the water outlet of nitrosation can be used as the water inlet of follow-up anaerobic ammonia oxidation process, it is de- to be combined into full autotrophic type biology
Nitrogen technique, it is considered to be the most denitrogenation technology of sustainable development characteristic so far, thus extensive concern is obtained, it has been widely used
In the processing of municipal sewage sludge pressing filtering liquid, landfill leachate and gourmet powder waste water etc..
But since ammonia oxidizing bacteria (AOB) is autotroph, growth is relatively slow；Again because nitrifying process oxygen will
Ammonium oxidation is nitrite, and aeration can cause reactor interior air-flow shearing force larger, be unfavorable for the formation of granule sludge, thus
Nitrosation sludge settling property in reactor is bad, is easily lost in water outlet, the sludge concentration in reactor often maintain compared with
Low-level limits further increasing for nitrosation reactor performance.Therefore, nitrosation Sludge Property in reactor is not being influenced
Under the premise of, the settling property of nitrosation sludge is improved by suitable method, can strengthen nitrosation sludge in reactor
It withholds, reduces the probability that sludge outflows with water, to improve the sludge concentration in reactor, and then improve the nitrosation of reactor
Performance.
Based on above-mentioned thinking, the present invention carries out precipitation of calcium carbonate attachment to nitrosation sludge first, is inoculated in reactor,
The inorganic carbon source concentration of water inlet of reactor is stepped up, and adds solubility calcium salting liquid from the reaction zone overhead stream of reactor, no
The gentle punching performance of sufficient inorganic carbon source needed for ammonia oxidation bacteria is provided only, carbonate deposition is successfully also attached to nitrosation
Sludge Surface significantly improves sludge settling property under the premise of not influencing the nitrosation sludge activity of sludge, to increase
Biomass in reactor, improves the performance of nitrosation reactor.
Invention content
The purpose of the present invention is overcome the deficiencies of the prior art and provide a kind of raising nitrosation reactor sludge settling property
Method.
A method of nitrosation reactor sludge settling property is improved, is included the following steps successively：
(1) nitrosation sludge is rinsed with phosphate buffer；
(2) nitrosation sludge is placed in the mixed solution containing soluble calcium salt and bicarbonate or carbonate, keeps mixed
Dissolved oxygen in liquid is closed, at the uniform velocity stirs, the lime deposit of generation is made to be attached on sludge, hypsokinesis is stood and removes supernatant；
(3) step is at least repeated (2) 1 times；
(4) step (3) treated nitrosation sludge will be passed through and continuous flow gas-lifting type nitrosation reactor is added, from reaction
Device bottom steps up the bicarbonate or carbonate concentration in reactor water inlet, while adding from the top of reactor reaction zone stream
Solubility calcium salting liquid, the lime deposit for reacting generation is attached to top Sludge Surface, with the settling property of reinforcement sludge,
The sludge concentration in reactor is improved, and then improves the nitrosation performance of reactor.
Nitrosation sludge is washed off into surface impurity with phosphate buffer in step (1), so as to the attachment of calcium carbonate.
Nitrosation sludge described in step (1) is cotton-shaped, and grain size 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.
By volume 1 in step (2):1~5 is placed in nitrosation sludge containing soluble calcium salt and bicarbonate or carbonate
Mixed solution in.
Soluble calcium salt includes calcium chloride in step (2)；Bicarbonate include one kind in sodium bicarbonate, saleratus or
Two kinds, carbonate includes one or both of sodium carbonate, potassium carbonate.
Soluble calcium salt is a concentration of in the mixed solution containing soluble calcium salt and bicarbonate or carbonate in step (2)
A concentration of 2.5~5g/L of 0.005~0.02g/L, bicarbonate or carbonate.
Ammonia nitrogen concentration 100 in step (2) in the mixed solution containing soluble calcium salt and bicarbonate or carbonate~
150mg/L, pH=7~8.5.
Step (2) keeps 0.1~0.5mg/L of dissolved oxygen in mixed liquor, and at the uniform velocity mixing speed is 5~20r/min, when stirring
Between for 6~for 24 hours.
Continuous flow gas-lifting type nitrosation reactor ratio of height to diameter described in step (4) is more than 3:1；Carbon in reactor water inlet
Sour hydrogen salt or a concentration of 2.5~14g/L of carbonate solution, a concentration of 0.1~0.5g/L of soluble calcium salt, solubility calcium salting liquid
3.5~7mL/ (Ld) is remained from the flow acceleration at the top of reactor reaction zone.
Compared with prior art, advantage for present invention：
(1) present invention uses the mixed solution of potassium-containing hydrogen salt (or carbonate) and soluble calcium salt to nitrosation sludge
It being pre-processed, the concentration by controlling bicarbonate (or carbonate) and soluble calcium salt makes it generate precipitation of calcium carbonate, and
Part calcium carbonate precipitation is set to be attached on sludge by low at the uniform velocity stirring, to ensure that it is dirty that calcium carbonate adhesion amount is unlikely to reduce
In the case of mud is active, the density of sludge is improved, enhances the settling property of sludge.
(2) present invention is put by pretreated nitrosation sludge in nitrosation reactor, keeps higher waterpower negative
Lotus, while bicarbonate (carbonate) concentration is stepped up from reactor bottom, provide not only ammonia oxidation bacteria institute in reaction zone
The inorganic carbon source of abundance needed, and the cushion performance of solution is improved, it may advantageously facilitate nitrosation reaction.
(3) present invention adds solubility calcium salting liquid from reaction zone overhead stream, and the precipitation of calcium carbonate of generation is made to be attached to reaction
The settling property of this floating sludge can be improved in the nitrosation sludge on area top, and rush makes it through sedimentation and is back to reaction zone, alleviates
It improves the biomass of reaction zone with the loss of water outlet；It also can avoid the work that excess calcium carbonate is attached to reaction zone bottom simultaneously
Property nitrosation sludge on, it is ensured that the nitrosation of sludge activity.
Description of the drawings
Fig. 1 is the technological process of the method for the raising nitrosation reactor sludge settling property of the present invention；
Fig. 2 is the reactor nitrosation performance of embodiment 1 using the present invention；
Fig. 3 be embodiment 2 using the present invention obtain nitrosation sludge (a) and sediment (b), SEM pictures (c) and
XRD spectrum (d).
Specific implementation mode：
The invention will be further described by the following examples, is not intended to limit the present invention.
Embodiment 1
By the gas-lifting type nitrosation reactor (volumetric loading 0.61kg/ (m that total measurement (volume) is 8L3D), hydraulic detention time
15.9h, volume elimination capacity are 0.18kg/ (m3D), reaction zone volume 4L) standing sedimentation, incline supernatant, by reaction zone
Sludge takes out, and it is 0.1mm, sludge density 1.006g/mL to measure sludge average grain diameter.Phosphate buffer (the pH of 1mM is used first
=7) it rinses 3 times, then places it in na concn containing bicarbonate 3.5g/L, calcium chloride concentration 0.01g/L, ammonia nitrogen concentration 100mg/L
Mixed solution (pH=7.5~7.9) in, the volume ratio of sludge and mixed solution is 1:1.5, keep dissolved oxygen concentration in solution
For 0.2mg/L, mixing speed 10r/min, 10h is stirred, precipitation stands hypsokinesis and removes supernatant.It will locate in advance after repeating above-mentioned steps
In the former reactor of nitrosation sludge input after reason, keep hydraulic detention time constant constant with volumetric loading, it gradually will water inlet
In sodium bicarbonate concentration improved to 7g/L by 2.5g/L, the calcium chloride concentration of stream plus 0.2g/L at the top of the reaction zone, stream accelerate
Degree is that 4.4mL/ (Ld) successfully rises to reactor volume load by the operation of 55d by peristaltic pump control
0.45kg/(m3D), nitrite accumulation rate is consistently higher than 85%, and the nitrosation performance of reactor is stable and efficient.It measures anti-
Device sludge concentration is answered to be improved to 3.8gVSS/L by original 1.1gVSS/L, but VSS/SS is then reduced to by original 80%
69%, settling property SVI3087mL/gVSS is reduced to by initial 102mL/gVSS.The experimental results showed that nitrosation sludge
Settling property improves about 15%, and biomass improves 3 times in reactor, and the nitrosation performance of reactor improves 2.5 times.
Embodiment 2
From certain 1m3Pilot reactor (volumetric loading 1.0kg/ (m3D) nitrosation sludge) is taken out, its sludge density is measured
For 1.01g/mL, average grain diameter 0.12mm, sludge nitrosation activity is 0.3kg/ (kgd), SVI30For 87.9mL/g.First
It is rinsed 3 times with the phosphate buffer (pH=7) of 1mM, then places it in containing sodium carbonate concentration 4.0g/L, calcium chloride concentration 0.02g/
In the mixed solution (pH=7.5~7.9) of L, ammonia nitrogen concentration 100mg/L, the volume ratio of sludge and mixed liquor is 1:1, it keeps molten
Dissolved oxygen concentration is 0.2mg/L, mixing speed 10r/min in liquid, stirs 12h, precipitation stands hypsokinesis and removes supernatant, then will locate in advance
The gas-lifting type nitrosation reactor of nitrosation sludge input 8L after reason, controls influent ammonium concentration 350mg/L, dissolved oxygen concentration
0.2~0.5mg/L gradually improves water inlet sodium bicarbonate concentration to 14g/L, keeps calcium chloride solution (0.4g/ at the top of reaction zone
L stream rate of acceleration 4.4mL/ (Ld)), in the case where maintaining ammonia removal rate to be more than 90% nitrite accumulation rate more than 80%,
By the operation of nearly 200d, the hydraulic detention time of reactor can be foreshortened to 4.8h, the volumetric loading and appearance of reactor from 15h
Product elimination capacity is respectively increased to 1.77 and 1.65kg/ (m3·d).Measure the SVI of sludge30Only 44.5mL/g, sludge sink
Drop performance improves about 1 times, and observation finds that reactor wall is attached with pale precipitation, will be known to precipitation taking-up XRD analysis
It becomes predominantly calcium carbonate, while observing Sludge Surface using scanning electron microscope (SEM) and finding that surface auxiliary has crystal, determines
Precipitation of calcium carbonate is attached to sludge and shows to significantly enhance the settling property of nitrosation sludge, finally improves reactor
Nitrosation performance.
Claims (10)
1. a kind of method improving nitrosation reactor sludge settling property, which is characterized in that include the following steps successively：
(1) nitrosation sludge is rinsed with phosphate buffer；
(2) nitrosation sludge is placed in the mixed solution containing soluble calcium salt and bicarbonate or carbonate, keeps mixed liquor
Middle dissolved oxygen, is at the uniform velocity stirred, and the lime deposit of generation is made to be attached on sludge, is stood hypsokinesis and is removed supernatant；
(3) step is at least repeated (2) 1 times；
(4) step (3) treated nitrosation sludge will be passed through and continuous flow gas-lifting type nitrosation reactor is added, from reactor bottom
Portion step up reactor water inlet in bicarbonate or carbonate concentration, while from the top of reactor reaction zone stream plus it is solvable
Property calcium salt soln, the lime deposit for reacting generation is attached to top Sludge Surface, with the settling property of reinforcement sludge, improves
Sludge concentration in reactor, and then improve the nitrosation performance of reactor.
2. the method according to claim 1 for improving nitrosation reactor sludge settling property, which is characterized in that step
(1) nitrosation sludge is washed off into surface impurity with phosphate buffer in, so as to the attachment of calcium carbonate.
3. the method according to claim 1 for improving nitrosation reactor sludge settling property, which is characterized in that step
(1) the nitrosation sludge described in is cotton-shaped, and grain size is less than 1mm, and density is less than 1.02g/mL.
4. the method according to claim 1 for improving nitrosation reactor sludge settling property, which is characterized in that step
(1) phosphate buffer density described in is 0.5~1mM, pH=7~8.
5. the method according to claim 1 for improving nitrosation reactor sludge settling property, which is characterized in that step
(2) by volume 1 in:1~5 is placed in nitrosation sludge the mixed solution containing soluble calcium salt and bicarbonate or carbonate
In.
6. the method according to claim 1 for improving nitrosation reactor sludge settling property, which is characterized in that step
(2) soluble calcium salt includes calcium chloride in；Bicarbonate includes one or both of sodium bicarbonate, saleratus, carbonate
Including one or both of sodium carbonate, potassium carbonate.
7. the method according to claim 1 for improving nitrosation reactor sludge settling property, which is characterized in that step
(2) a concentration of 0.005~0.02g/ of soluble calcium salt in the mixed solution containing soluble calcium salt and bicarbonate or carbonate in
A concentration of 2.5~5g/L of L, bicarbonate or carbonate.
8. the method according to claim 1 for improving nitrosation reactor sludge settling property, which is characterized in that step
(2) ammonia nitrogen concentration 100~150mg/L, pH=7 in the mixed solution containing soluble calcium salt and bicarbonate or carbonate in~
8.5。
9. the method for the raising nitrosation reactor sludge settling property according to claim 1 or 5 or 6 or 7 or 8, special
Sign is, step (2) keeps 0.1~0.5mg/L of dissolved oxygen in mixed liquor, and at the uniform velocity mixing speed is 5~20r/min, when stirring
Between for 6~for 24 hours.
10. the method according to claim 1 for improving nitrosation reactor sludge settling property, which is characterized in that step
(4) the continuous flow gas-lifting type nitrosation reactor ratio of height to diameter described in is more than 3:1；Bicarbonate or carbonic acid in reactor water inlet
Concentration of salt solution is 2.5~14g/L, and a concentration of 0.1~0.5g/L of soluble calcium salt, solubility calcium salting liquid is from reactor reaction
Flow acceleration at the top of area remains 3.5~7mL/ (Ld).
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN103708609A (en) * | 2013-12-15 | 2014-04-09 | 北京工业大学 | Quick culture method of nitrosation granular sludge |
| CN103739178A (en) * | 2013-12-26 | 2014-04-23 | 中南大学 | Rapid starting method of anaerobic ammonia oxidation reactor for enhancing sludge hydrolysis |
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| CN101691273B (en) * | 2009-09-28 | 2012-07-04 | 广州普得环保设备有限公司 | Method for integration of thickening, dehydration and aerobic air drying of sewage sludge |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103708609A (en) * | 2013-12-15 | 2014-04-09 | 北京工业大学 | Quick culture method of nitrosation granular sludge |
| CN103739178A (en) * | 2013-12-26 | 2014-04-23 | 中南大学 | Rapid starting method of anaerobic ammonia oxidation reactor for enhancing sludge hydrolysis |
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