CN104911138B - Alkaline-resisting sulfur-oxidizing bacteria for methane bio-desulfurization quickly tames enrichment method - Google Patents
Alkaline-resisting sulfur-oxidizing bacteria for methane bio-desulfurization quickly tames enrichment method Download PDFInfo
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- CN104911138B CN104911138B CN201510298255.5A CN201510298255A CN104911138B CN 104911138 B CN104911138 B CN 104911138B CN 201510298255 A CN201510298255 A CN 201510298255A CN 104911138 B CN104911138 B CN 104911138B
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Abstract
The invention discloses a kind of alkaline-resisting sulfur-oxidizing bacterias for methane bio-desulfurization quickly to tame enrichment method.Utilize sequencing batch reactor（SBR）And continuous stirred tank reactor（CSTR）The domestication and enrichment of the alkaline-resisting sulfur-oxidizing bacteria needed for methane bio-desulfurization are carried out, step is：The secondary settling tank sludge of municipal sewage plant is inoculated with first in SBR, acclimation sludge under the conditions of room temperature and high pH is stepped up sulfide concentration, and sulfur-oxidizing bacteria is cultivated by selectivity domestication in seed sludge；Secondly after the completion of sludge acclimatization, SBR is changed to CSTR operations, first reduces hydraulic detention time, rear to increase aeration quantity and be stepped up sulfide concentration, is successfully enriched with alkaline-resisting sulfur-oxidizing bacteria；Finally reduce aeration quantity, the surplus sludge volume in water outlet is reduced while reducing operating cost.The present invention solves the problems, such as the startup in traditional directly continuous training method slowly and the requirement of kind mud is harsh, effectively shortens the enrichment time of alkaline-resisting sulfur-oxidizing bacteria.
Description
Technical field
The invention belongs to sludge acclimatization fields, and in particular to a kind of alkaline-resisting sulfur-oxidizing bacteria for methane bio-desulfurization is fast
Speed domestication enrichment method.
Background technology
Biogas has higher calorific value due to the methane containing 60%~70% or so, is received in today that the energy increasingly lacks
Concern.Under normal conditions, 0.01 ~ 1.00% is contained in biogas（v/v）H2S, source is mainly since microorganism is to protein
Decomposition or sulfate reduction.H2The safety that S drastically influences biogas production and utilizes.H2After S sucks human body, exhale
Desorption system, the circulatory system, digestive system and nervous system can be by serious influences, or even death.It is therein when biogas combustion
H2S is oxidized to SOx, not only pollutes the environment, but also meeting etching apparatus, seriously affects atmospheric environment and biogas utilization equipment
Service life.Therefore, biogas must remove H therein before2S。
Currently, biogas desulfurization technology mainly has dry desulfurization, wet desulphurization and biological desulphurization.Fe2O3Dry desulfurization is state
Interior biogas desulfurization uses most technique.Fe2O3Desulfurizing agent can be continuing with after regenerating in theory, however when onsite application
Desulfurizer regeneration poor effect, needs to frequently replace desulfurizing agent.Dry desulfurization cost accounts for 20% or more biogas production totle drilling cost, because
This, dry desulfurization there are processing cost height and generate secondary pollution the shortcomings of.Wet desulphurization is in lye by H2S is oxidized to sulphur
Sulphur, catalyst air regenesis recycle.Common lye has sodium carbonate, ammonium hydroxide etc..There are stabilities of solution for wet oxidation process
Difference is easy to happen side reaction, regenerates the shortcomings of incomplete, investment cost is high.
Biological desulphurization is an advantage over dry method, a kind of new technology of wet desulphurization, and biological desulphurization is to utilize desulfurization microorganism by natural pond
Sulfide in gas is converted into elemental sulfur or sulfate by biological oxidation process, while providing growth metabolism for microorganism itself
The process of required energy.It can overcome the shortcomings of other desulfurization technologies at many aspects, have non-secondary pollution, energy consumption less,
The advantages such as chemical catalyst, cost of investment be low are not needed.Most biological desulphurization is the sludge for being inoculated with municipal sewage plant,
By aerobic culture, the domestication enrichment of the inorganic medium culture containing sulfide is added and obtains the activity dirt containing sulfur-oxidizing bacteria
Mud, but this process is limited to the mass transfer and pH of oxygen, when oxygen content is high, a large amount of sulfide, which is oxidized to sulfate radical, to be made instead
It answers process to be acidified, or even reactor is made to collapse, therefore reactor needs are run under conditions of low oxygen content, make the oxygen of sulfide
Change the stage for resting on elemental sulfur as possible, on the one hand ensure the normal operation of reactor, on the other hand can save energy consumption and returns
Receive Sulphur ressource.Alkaline-resisting sulfur-oxidizing bacteria has good activity under high ph conditions, and the condition that can be limited in oxygen is even low-down
It is run under oxidation-reduction potential, and the amount for generating sulfate radical can be limited.
Invention content
In being directed to sulfur-oxidizing bacteria domestication enrichment process in current methane bio-desulfurization and applying
There are the problem of, a kind of alkaline-resisting sulfur-oxidizing bacteria for methane bio-desulfurization is provided and quickly tames enrichment method, particular content
It is as follows：
It includes sludge seeding, sludge acclimatization that alkaline-resisting sulfur-oxidizing bacteria for methane bio-desulfurization, which quickly tames enrichment method,
With three steps of sludge growth；
1) sludge used in the process of sludge seeding is the secondary settling tank sludge of municipal sewage plant, seed sludge concentration
For 10 ~ 15 g/L；
2) sludge acclimatization the specific steps are：Sludge acclimatization carries out in the reactor using SBR process operations, reactor
Middle aeration quantity is 8 ~ 10 L/min, is arranged different water inlet sulfide gradients during domestication, respectively 20,40,60,80,
100,120 mg/L proceeds by sludge acclimatization from minimum water inlet sulfide concentration 20mg/L, increases step by step into Sulfide in water
Concentration, when sulfide removal rate reaches 90% or more, it is believed that sludge reaches the activity under this corresponding water inlet sulfide concentration, into
Enter sludge acclimatization under next influent concentration gradient, when sludge reaches the work that 120 mg/L of highest water inlet sulfide concentration is required
Property, and when continuous and steady operation one week, sludge acclimatization is completed；
3) sludge growth the specific steps are：Sludge growth carries out in the reactor using CSTR process operations；It is first
First, the aeration quantity in reactor is 8 ~ 10L/min, is arranged different hydraulic detention time gradients, respectively 24,18,12,10,
8,6,4,2 h proceeds by sludge growth from 24 h of maximum hydraulic detention time, when sulfide removal rate reaches 90% or more,
Keep stable operation 20 ~ for 24 hours, into next hydraulic detention time under sludge growth, when sludge reaches minimum hydraulic retention
When the activity that 2 h of the time requires, the aeration quantity promoted in reactor is 40 ~ 50L/min, and different water inlet sulfide ladders is arranged
Degree, respectively 120,200,280,360,440,520mg/L, proceed by sludge from minimum water inlet sulfide concentration 120mg/L
Domestication increases sulfide concentration in water inlet, when sulfide removal rate reaches 90% or more step by step, it is believed that it is corresponding that sludge reaches this
Intake sulfide concentration under activity, into next influent concentration gradient under sludge acclimatization, when sludge reaches highest water inlet
When the activity that 520 mg/L of sulfide concentration is required, it is 20 ~ 25L/min to reduce aeration quantity in reactor, keeps water inlet sulfide
A concentration of 520mg/L, when sulfide removal rate reaches 95% or more, and when stable operation 30 days or more, sludge growth is completed；
DO in step 2) in reactor is 0.5 ~ 1.0mg/L, and temperature is 20 ~ 30 DEG C, and pH is 9.0 ~ 10.0.
Temperature in step 3) in reactor is 20 ~ 30 DEG C, and pH is 9.0 ~ 10.0.
Reactor water inlet contains NaHCO3、Na2S、MgSO4、NH4Cl、KH2PO4、K2HPO4And trace element, vulcanize in water inlet
Object concentration is by Na2The content of S is adjusted.
Control activated Sludge System MLSS is in 2000 ~ 3000mg/L in the overall process of step 2) and step 3).
The present invention flexibly quickly tames the alkaline-resisting sulfur-oxidizing bacteria of enrichment using SBR and CSTR, easy to implement, and shortens
Start the time.Seed sludge comes from municipal sewage plant's secondary settling tank in the present invention, and sludge is simple and easy to get, convenient for domestication.Work
The domestication stage of skill uses SBR, simple for process, and operation control is flexible, resistance to overload shock, and is conducive to sludge and shuts off amplification；Work
The enrichment of skill（Load lifting）Stage uses CSTR, and sludge loading, operation letter are promoted by adjusting HRT and water inlet sulfide concentration
Just, it is suitble to microorganism growth, it is slow-growing to solve biological desulfurization process for biogas sludge, and processing load is low, starts slow problem.
Description of the drawings
Fig. 1 is the structure of reactor figure for taming and being enriched in the embodiment of the present invention；
Fig. 2 is device operation schematic diagram in the present invention.
Specific implementation mode
The specific implementation mode of the present invention is further described below according to attached drawing.
Embodiment 1：
The present embodiment provides a kind of alkaline-resisting sulfur-oxidizing bacteria for methane bio-desulfurization and quickly tames enrichment method, with
Manual simulation's water distribution is water inlet, and experimental provision can be used as SBR and CSTR simultaneously, and experimental provision is as shown in Fig. 2, device is that annular is anti-
Device is answered, when being used as CSTR, device can be divided into aeration tank and sedimentation basin by partition board, and sedimentation basin upper end is equipped with sedimentation basin overflow port, raw
Object aeration tank top is equipped with isolation board, air outlet, water inlet, and water inlet is connected with intake pump, and lower sides are equipped with air
Air inlet pipe and dissolved oxygen probe, lower part is equipped with air aeration disk, air intake duct one end and air aeration disk in bio-aeration pool
It is connected, the air intake duct other end is connected with air inlet pump, and bio-aeration pool bottom is equipped with spoil disposal sulphur discharging pipeline.When progress sludge
When domestication, the partition board of device is taken away, is used as SBR；Carry out alkali resistance sulfur oxidizing bacterium enrichment（Sludge loading is promoted）When, it loads onto
Partition board, the sedimentation basin of recovery device, uses as CSTR.The sludge acclimatization stage is mainly by increasing into Sulfide in water in experiment
Concentration realize, the enrichment of alkali resistance sulfur oxidizing bacterium（Sludge loading is promoted）Mainly by adjusting hydraulic detention time（HRT）With
Aeration quantity is realized.
Reactor employed in the present invention is SBR and CSTR dual purpose reactors, i.e. device can be divided into aeration tank by partition board
And sedimentation basin, the effective volume of aeration tank is 20L, and the effective volume of sedimentation basin is 5L, and aerator is installed in the bottom of aeration tank,
The DO concentration in reactor waste water can be controlled by adjusting aeration quantity.Water inlet is delivered to by peristaltic pump in reactor, is intake
Flow is controlled by the rotating speed of peristaltic pump, top pool wall of the water outlet in sedimentation basin.Experiment is intake with artificial synthesized waste water to simulate,
Include mainly NaHCO into water-based3、Na2S、MgSO4、NH4Cl、KH2PO4、K2HPO4And trace element.
The method that quickly domestication is enriched with alkaline-resisting sulfur-oxidizing bacteria in the present invention, thinking are：Ordinary municipal is inoculated in SBR
The secondary settling tank sludge of sewage treatment plant, seed sludge convenient sources, it is desirable that it is low, containing a small amount of sulfur-oxidizing bacteria, by sludge seeding
It to new reactor, needs to tame under appropriate conditions, filters out the alkaline-resisting sulfur-oxidizing bacteria of methane bio-desulfurization needs.It is dirty
After water inoculation, using artificial distribution as matrix, the culture solution in water distribution is the inorganic medium containing sulfide, can be tamed in this way
Chemosynthetic autotroph is separated using sulfide as the sulfur-oxidizing bacteria of the energy, aeration makes sludge keep activity.It is completed in domestication
Later, SBR is changed to CSTR operations, first reduces hydraulic detention time, rear to increase aeration quantity and be stepped up sulfide concentration, success
It is enriched with alkaline-resisting sulfur-oxidizing bacteria；Finally reduce aeration quantity, the surplus sludge volume in water outlet is reduced while reducing operating cost.
Specific processing is as follows：
Sludge acclimatization carries out in the reactor using SBR process operations, and the two of inoculation ordinary municipal sewage treatment plant are heavy
Pond sludge is in SBR, seed sludge a concentration of 10 ~ 15g/L, inoculum concentration 5L, and it is 2 ~ 3g/ to be inoculated with sludge concentration in post-reactor
L.It is intake, is intake by NaHCO using manual simulation3、Na2S、MgSO4、NH4Cl、KH2PO4、K2HPO4And trace element prepare and
At without organic carbon source.Aeration quantity is 8 ~ 10 L/min in reactor, and different water inlet sulfide ladders is arranged during domestication
Degree, respectively 20,40,60,80,100,120 mg/L, proceed by sludge acclimatization from minimum water inlet sulfide concentration 20mg/L,
Increase sulfide concentration in water inlet step by step, when sulfide removal rate reaches 90% or more, it is believed that sludge reaches this corresponding water inlet sulphur
Activity under compound concentration, reactor enter precipitation, and the sludge settling time is 60min or so, discharges supernatant, and leave unused 30min
Afterwards, buffer solution can be added or be directly added into when pH deviates setting range into the domestication of sludge under next influent concentration
Acid/base is adjusted；When sludge reaches the activity that 120 mg/L of highest water inlet sulfide concentration is required, that is, sulfide of intaking
Under conditions of a concentration of 120mg/L, when sulfide removal rate reaches 90%, and continuous and steady operation is after a week, it is believed that sludge is complete
Complete domestication.
The aeration quantity promoted in reactor is 40 ~ 50L/min, is arranged different water inlet sulfide gradients, respectively 120,
200,280,360,440,520mg/L, proceeds by sludge acclimatization from minimum water inlet sulfide concentration 120mg/L, increases step by step
Sulfide concentration in water inlet, when sulfide removal rate reaches 90% or more, it is believed that sludge reaches this corresponding water inlet sulfide concentration
Under activity, into next influent concentration gradient under sludge acclimatization, when sludge reaches highest water inlet sulfide concentration 520
When the activity that mg/L is required, it is 20 ~ 25L/min to promote aeration quantity in reactor, and it is 520mg/L to keep water inlet sulfide concentration,
When sulfide removal rate reaches 95% or more, and when stable operation 30 days or more, sludge growth is completed；
After sludge completes domestication, in order to adapt to sulfide removal burden requirement in biological desulfurization process for biogas, running gear
Partition board is loaded onto, sedimentation basin is restored, reactor is changed to CSTR operations, is enriched with into alkali resistance sulfur oxidizing bacterium（Sludge growth）Stage.
Under conditions of aeration quantity is 8 ~ 10L/min, different hydraulic detention time gradients is set, respectively 24,18,12,10,8,
6,4,2 h proceeds by sludge growth from 24 h of maximum hydraulic detention time；Water inlet is delivered to by peristaltic pump in CSTR, is controlled
Reactor water inlet sulfide 120mg/L, flow of inlet water 0.0167L/min react hydraulic detention time（HRT）For for 24 hours, temperature
Degree is 20 ~ 30 DEG C, and pH is 9.0 ~ 10.0, when sulfide removal rate reaches 90% or more, keeps stable operation for 24 hours, entrance is next
The promotion of sludge loading under the conditions of a HRT；HRT impact after the completion of, promotions aeration quantity be 40 ~ 50L/min, be arranged it is different into
Water sulfide gradient, respectively 120,200,280,360,440,520mg/L, opened from minimum water inlet sulfide concentration 120mg/L
Begin to carry out sludge acclimatization, increase sulfide concentration in water inlet step by step, water inlet is delivered to by peristaltic pump in CSTR, and flow of inlet water is
0.2L/min reacts hydraulic detention time（HRT）For 2h, temperature is 20 ~ 30 DEG C, and pH is 9.0 ~ 10.0, when sulfide removes
When rate reaches 90% or more, keep stable operation for 24 hours, into next influent concentration under sludge loading promotion；
When sludge reaches the activity that highest water inlet sulfide concentration 520 mg/L is required, reduce aeration quantity be 20 ~
25L/min, keep water inlet sulfide concentration be 520mg/L, any organic carbon source is not added in water distribution, by reduce aeration quantity come
It reduces operating cost and is aerated the influence precipitated to clarifier sludge.Temperature is 20 ~ 30 DEG C, and pH connects under conditions of being 9.0 ~ 10.0
Reforwarding row, when sulfide removal rate reaches 95% or more, the elimination capacity of sulfide reaches 4.60kgH2S/m3/ d, sulfur-oxidizing bacteria
Activity discharged completely, sludge growth complete, amount to 50 days.In this stage, reactor stable operation under alkaline condition
30 days, the highest elimination capacity of sulfide reached 4.60kgH2S/m3/d.In having reported document, domestication enrichment sulfur-oxidizing bacteria
Technique generally require 3 ~ 5 months, and not easy to operate, laboratory load is far below 4.60kgH2S/m3/d.Therefore, of the invention
It is a kind of technique that sulfur-oxidizing bacteria domestication enrichment is rapidly completed in effective inoculation municipal sewage plant's secondary settling tank sludge.
Claims (2)
1. a kind of alkaline-resisting sulfur-oxidizing bacteria for methane bio-desulfurization quickly tames enrichment method, which is characterized in that including dirt
Three mud inoculation, sludge acclimatization and sludge growth steps；
1) sludge used in the process of sludge seeding be municipal sewage plant secondary settling tank sludge, seed sludge a concentration of 10 ~
15 g/L；
2) sludge acclimatization the specific steps are：Sludge acclimatization carries out in the reactor using SBR process operations, is exposed in reactor
Tolerance is 8 ~ 10 L/min, tames and different water inlet sulfide gradients is arranged in the process, respectively 20,40,60,80,100,120
Mg/L proceeds by sludge acclimatization from minimum water inlet sulfide concentration 20mg/L, increases sulfide concentration in water inlet step by step, works as sulphur
When compound removal rate reaches 90% or more, it is believed that sludge reaches the activity under this corresponding water inlet sulfide concentration, into it is next into
Sludge acclimatization under water concentration gradients, when sludge reaches the activity that highest water inlet sulfide concentration 120 mg/L is required, and it is continuous
When stable operation one week, sludge acclimatization is completed；
3) sludge growth the specific steps are：Sludge growth carries out in the reactor using CSTR process operations；First, instead
It is 8 ~ 10L/min to answer aeration quantity in device, is arranged different hydraulic detention time gradients, respectively 24,18,12,10,8,6,4,
2 h proceed by sludge growth from 24 h of maximum hydraulic detention time, when sulfide removal rate reaches 90% or more, keep steady
Surely operation 20 ~ for 24 hours, into next hydraulic detention time under sludge growth, when sludge reaches minimum 2 h of hydraulic detention time
It is required that activity when, promoted reactor in aeration quantity be 40 ~ 50L/min, different water inlet sulfide gradients is set, respectively
120,200,280,360,440,520mg/L, proceeds by sludge acclimatization, step by step from minimum water inlet sulfide concentration 120mg/L
Increase sulfide concentration in water inlet, when sulfide removal rate reaches 90% or more, it is believed that sludge reaches this corresponding water inlet sulfide
Activity under concentration, into next influent concentration gradient under sludge acclimatization, when sludge reaches highest water inlet sulfide concentration
When the activity that 520 mg/L are required, it is 20 ~ 25L/min to reduce aeration quantity in reactor, and holding water inlet sulfide concentration is
520mg/L, when sulfide removal rate reaches 95% or more, and when stable operation 30 days or more, sludge growth is completed；
DO in step 2) in reactor is 0.5 ~ 1.0mg/L, and temperature is 20 ~ 30 DEG C, and pH is 9.0 ~ 10.0；Reaction in step 3)
Temperature in device is 20 ~ 30 DEG C, and pH is 9.0 ~ 10.0；Control activated Sludge System MLSS in the overall process of step 2) and step 3)
In 2000 ~ 3000mg/L.
2. enrichment method is quickly tamed for the alkaline-resisting sulfur-oxidizing bacteria of methane bio-desulfurization as described in claim 1, it is special
Sign is that reactor water inlet contains NaHCO3、Na2S、MgSO4、NH4Cl、KH2PO4、K2HPO4And trace element, vulcanize in water inlet
Object concentration is by Na2The content of S is adjusted.
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| CN104478084B (en) * | 2014-12-08 | 2016-02-17 | 天津城建大学 | A kind of method improving winter low temperature saprobia denitrification denitrogenation |
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| CN102710441A (en) * | 2012-05-31 | 2012-10-03 | 朱峻茂 | Uniform-interface-based multi-platform information acquisition method and information acquisition system |
| CN103523909A (en) * | 2013-11-01 | 2014-01-22 | 南昌航空大学 | Process method and reactor for recycling elemental sulfur from organic waste water containing sulfate |
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