CN104609551A - Synchronous nitrification and denitrification treatment method of ammonia-containing wastewater - Google Patents
Synchronous nitrification and denitrification treatment method of ammonia-containing wastewater Download PDFInfo
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Abstract
The invention provides a synchronous nitrification and denitrification treatment method of ammonia-containing wastewater. The method comprises the following contents: nitrifying activated sludge and aerobic denitrifying activated sludge are added into a bioreactor with a built-in membrane separation assembly, the nitrifying activated sludge undergoes nitration in the outside area of the membrane separation assembly, the aerobic denitrifying activated sludge undergoes denitrification for nitrogen removal in the inner area of the membrane separation assembly, and wastewater in the outside and inner areas of the membrane separation assembly is communicated with each other; the bioreactor also contains a guide cylinder and an aeration system; the guide cylinder is a hollow structure; the membrane separation assembly is positioned at the inner side of the guide cylinder; and the aeration system carries out aeration on the outside of the guide cylinder. By the use of the membrane separation assembly, the nitrifying activated sludge and the denitrifying activated sludge in the reactor are separated, and the sludge acts in respectively separate space, not interfering with each other. Wastewater components are mixed and communicated with each other. In addition, different dissolved oxygen environments can be provided, and synchronous nitrification and denitrification efficiency is enhanced.
Description
Technical field
The invention belongs to field of waste water treatment, relate in particular to a kind of method of synchronous nitration and denitrification Ammonia-Containing Wastewater Treatment.
Background technology
Every day, because of its production technology characteristic, is discharged a large amount of ammonia-containing water by Chemical Manufacture enterprise.If directly discharged, can body eutrophication be caused, algal blooms, not only reduce water body ornamental value, and make hydrobiont hypoxia death.Some algae protein toxin also can make people poisoning through food chain, the serious harm mankind and biological existence.For this reason, how cost-effectively the ammonia nitrogen removed in waste water becomes problem demanding prompt solution.
Biological denitrificaion is one of comparatively cost-effective method removing nitrate pollution from waste water, generally comprises nitrifying process and denitrification process.Nitrifying process is NO by nitrifier by mineralized nitrogen
2 -and NO
3 -reaction process.Denitrification process is under anaerobic or hypoxia condition, NO
3 -and NO
2 -be converted into the process of gaseous matter by micro-reduction, need in reaction process using organic carbon as carbon source and the energy.No matter be traditional denitrification process or novel denitrification process, if be responsible for microbial host nitrifier and the denitrifying bacteria of denitrogenation.In actual applications, due to the difference of two kinds of thalli growth environment, be generally nitrifying process and denitrification process are separated, as traditional A/O, A
2, there is technique tediously long in/O technique, sewage treatment structure floor space is large, many drawbacks such as investment and working cost height.
Synchronous nitration denitrification denitrogenation refers to the novel process that nitration reaction and anti-nitration reaction carry out in same reactor inter-sync, not only overcome the deficiency that traditional technology nitrification and denitrification process is carried out or carried out in turn in same reactor in two different reactors, and in reduction energy consumption and material consumption etc., there is outstanding advantage.Such as, anti-nitration reaction equipment can be reduced, save capital cost; The alkali that denitrification process produces in part and the acid that produces of nitrifying process, can reduce the consumption of alkali lye, can effectively keep pH in reactor to stablize.Therefore, synchronous nitration denitrification denitrogenation process, has become the study hotspot of water treatment field.
Geng Jinju etc. utilize aerobic denitrifying bacteria group and the denitrogenation of Autotrophic nitrification flora composition (application and environmental organism journal, 2002,8 (1): 78-82), although have good ammonia nitrogen removal ability, impact resistance is more weak, and the ammonia nitrogen in high density higher than 300mg/L can suppress the growth of thalline, and when ammonia nitrogen concentration is higher than 200mg/L, after denitrogenation, ammonia nitrogen residual volume is more, synchronously not enduring high-concentration organic carbon, and the organic carbon control of the concentration thalli growth of 500mg/L also reduces denitrification effect; All kinds of microbial culture in this combination flora and growth conditions inconsistent, a kind of when playing function another kind be but in holddown, cause inharmonious each other, biological denitrificaion time lengthening, cost increases, and nitric efficiency is affected.
CN200910188109.1 discloses the method for a kind of synchronous nitration and denitrification process containing ammonia sewage, and first this method cultivates nitrogen removal granule sludge, then adopts the process of synchronous nitration and denitrification process containing ammonia sewage with this nitrogen removal granule sludge; This method is separation screening aerobic denitrifying bacteria from enrichment flora, then carries out domestication to it and cultivates, then be inoculated in nitrifying granular activated sludge and carry out nitrogen removal granule sludge cultivation; The nitrogen removal granule sludge of having tamed can be obtained when ammonia nitrogen and nitrogen removal rate reach more than 50%.This invention can complete nitration denitrification process in same reactor, although part solves traditional technology Problems existing, and, due to the difference of thalline, the operation that direct combination treatment waste water can not be steady in a long-term, the denitrification effect of long-term disposal is unsatisfactory.
Although at present synchronous nitration and denitrification has had larger development, the deficiencies such as it is less that ubiquity load, and clearance is on the low side, fluctuation of service, can not effective Ammonia-Containing Wastewater Treatment, and the removal problem of some technique run not consideration total nitrogen.Which greatly limits development and the application of synchronous nitration and denitrification technique.Therefore, how better to provide suitable growth conditions, ensure that nitrification and denitrification can efficiently carry out, make the operation of synchronous nitration and denitrification long-term stability, to the process accelerating the application of synchronous nitration denitrification denitrogenation process industry, there is positive effect.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of method of synchronous nitration and denitrification Ammonia-Containing Wastewater Treatment.The present invention utilizes membrane separation assemblies the nitrifying sludge in reactor and denitrification mud to be kept apart, make mud at respective space behavior separately, do not interfere with each other to each other, waste component is then realize blended and intercommunication, and different dissolved oxygen environment can be provided, improve the efficiency of synchronous nitration and denitrification.
The method of synchronous nitration and denitrification Ammonia-Containing Wastewater Treatment of the present invention, comprise following content: nitrifying sludge and aerobic denitrification mud are joined in the bio-reactor with built-in membrane separation assemblies, nitrifying sludge carries out nitration reaction in the external region of membrane separation assemblies, aerobic denitrification mud carries out denitrification denitrogenation at the interior region of membrane separation assemblies, the waste water intercommunication of exterior domain in membrane separation assemblies; Bio-reactor comprises guide shell and aerating system, and guide shell is hollow structure, and membrane separation assemblies is positioned at inside guide shell, and aerating system is aeration outside guide shell.
In the present invention, the material of membrane separation assemblies can adopt the various film with stalling characteristic, preferably adopts ceramic separation film, and film hole diameter is 0.05 ~ 0.5 μm.According to practical situation, design membrane separation assemblies is 1:2 ~ 1:6 with the effective volume ratio of bio-reactor.Reactor is given prominence in membrane separation assemblies upper end, and the sidewall of protuberance sets out the mouth of a river, and water outlet establishes separatory membrane, ensures in water outlet not containing suspended substance.Membrane separation assemblies inside is established agitator or is passed into nitrogen aeration, realizes abundant back-mixing.
In the present invention, guide shell is designed in bio-reactor, membrane separation assemblies is positioned at inside guide shell, aerating system is aeration outside guide shell then, internal recycle can be formed like this in membrane separation assemblies external region, not only contribute to the better back-mixing of nitrifying sludge, and the residence time of gas can be extended, improve the utilization ratio of outside atmosphere oxygen.Meanwhile, because the aeration rate in reactor center region reduces, the oxygen entering denitrification zone reduces relatively, advantageously under suitable hypoxia condition, plays nitrogen removal performance in aerobic denitrification mud.Aerating system adopts aeration plate, and aeration outlet is higher than guide shell lower end.
In the present invention, bio-reactor can be the bio-aeration reactor that aerating system is established in bottom, also can be airlift bioreactor.Other operational condition of bio-reactor processes the nitrifying sludge of waste water and the condition control of denitrification mud routinely.The determinator of culture system dissolved oxygen content can be set, adjust the oxygen concn in aeration as required, to obtain good effect.There is provided pH electrode to detect, so that by external source adds acid, alkali realizes system pH control simultaneously.Temperature controls as inner coil pipe type of heating or maintains required temperature at reactor outer setting temperature control chuck.
In the present invention, nitrifying sludge is preferably nitrifying granular activated sludge, can be nitre nitrogen and/or nitrite nitrogen by mineralized nitrogen; Aerobic denitrification mud is preferably aerobic denitrification particle sludge, and the nitre nitrogen that mineralized nitrogen can be become and/or nitrite nitrogen change into gas.In the process of actual waste water process, the sludge concentration controlling nitrifying sludge is 2.0 ~ 8.0g/L, and the sludge concentration of aerobic denitrification mud is 1.0 ~ 5.0g/L.
In the present invention, ammonia-containing water is the sewage containing COD and ammonia nitrogen of all applicable Biochemical method, and ammonia nitrogen concentration is generally 100 ~ 1000mg/L.Adopt batch water inlet or a continuum micromeehanics mode, take continuum micromeehanics mode to carry out biological denitrificaion process, hydraulic detention time is generally 8 ~ 24 hours.Containing in ammonia sewage treatment process, when running into treatment effect appearance fluctuation, additional nitration and/or denitrification strengthening microbial inoculum can be distinguished, keep stable synchronous nitration denitrification denitrogenation effect.
In the present invention, the nutritive substance needed for sludge treatment waste water can be added, to improve its reactive behavior.The proportioning of nutritive substance is: Fe
2+concentration is 0.01 ~ 0.06g/L, K
+concentration is 0.05 ~ 0.5g/L, Ca
2+concentration is 0.01 ~ 0.1g/L, Mg
2+concentration is 0.05 ~ 0.5g/L; PH value is 6.5 ~ 7.5.
In the present invention, according to carbon-nitrogen mass ratio for 3:1 ~ 10:1 adds organic carbon source needed for denitrification, organic carbon source can be Soduxin, sodium acetate, methyl alcohol, glucose or cellulosic hydrolysate etc.With batch or continuous mode supplement organic carbon source, preferably carry out stream according to the spending rate of organic carbon source and add, to reduce the impact of organic carbon source on nitrifying sludge.
In the present invention, the treatment condition of membrane separation assemblies external region adopt the condition with nitrifying sludge conditional likelihood, and as temperature is generally 20 DEG C ~ 40 DEG C, pH value is 6 ~ 9, and dissolved oxygen concentration is 1 ~ 5mg/L etc.In order to realize effective back-mixing of membrane separation assemblies external region, maintain aeration rate constant.When fluctuation appears in denitrification space dissolved oxygen concentration, by regulating the oxygen concn in aeration, to ensure that membrane separation assemblies external region dissolved oxygen concentration is at 1 ~ 5mg/L.
Compared with prior art, the present invention has following outstanding feature:
1, utilize membrane separation assemblies that the nitrifying sludge in reactor and aerobic denitrification mud are kept apart Ammonia-Containing Wastewater Treatment, make nitrifying sludge and denitrification mud at space behavior independent separately, waste component is then realize blended and intercommunication, set up nitrifying sludge and denitrification mud cooperation and the non-interfering stable system for handling of iuntercellular, and different dissolved oxygen environment can be provided, make the two can act under dissolved oxygen conditions suitable separately, improve the efficiency of synchronous nitration and denitrification.
2, nitrifier is different with the demand of aerobic denitrifying bacteria to dissolved oxygen, although aerobic denitrifying bacteria has oxygen-resistant ability, under the condition of hypoxemia, its nitrogen removal performance is higher, is therefore directly mixed by two kinds of bacterium and there is drawback.The present invention carries out aeration in the external region of membrane separation assemblies, due to the acting in conjunction of separatory membrane, nitrifying sludge, aerating system, guide shell and stirring, in membrane separation assemblies, exterior domain can form different dissolved oxygen concentrations, the dissolved oxygen concentration of interior region is starkly lower than external region, is conducive to aerobic denitrification mud and plays nitrogen removal performance under the hypoxia condition be suitable for.With two kinds of direct mixed phase ratios of bacterium, the present invention can make nitrifier and denitrifying bacteria grow under dissolved oxygen conditions suitable separately, effectively improves the denitrification activity of nitrifier and denitrifying bacteria, improves the nitric efficiency of synchronous nitration and denitrification.
3, nitrifier utilizes the ammonia nitrogen in waste water to carry out nitration reaction, and the nitre nitrogen of generation and/or nitrite nitrogen can enter the inner nutritive substance as aerobic denitrifying bacteria of membrane separation assemblies, and nitre nitrogen and/or nitrite nitrogen are changed into gas and constantly discharges by aerobic denitrifying bacteria.Along with the carrying out of aerobic denitrification, nitre nitrogen and/or nitrite nitrogen can enter the needs that membrane separation assemblies inside meets aerobic denitrifying bacteria; Simultaneously due to the reduction of product inhibition, contribute to the process and the effect that improve nitration reaction, the two complements each other and promotes, achieves the efficient removal of total nitrogen.
4, along with the carrying out of nitration reaction, need to add the pH that alkali lye maintains suitable growth, and the alkali that denitrification process produces in part and the acid that produces of nitrifying process, can reduce the consumption of alkali lye, pH in reactor effectively can be kept to stablize, meet the requirement of energy-saving and emission-reduction.
Accompanying drawing explanation
Fig. 1 is the structural representation of bio-reactor of the present invention;
Wherein: 1-bio-reactor, 2-membrane separation assemblies, 3-nitrification zone, 4-aerobic denitrification district, 5-aerating system, 6-agitator, 7-water-in, 8-fluid infusion mouth, 9-mends carbon mouth, 10-pneumatic outlet, 11-nitrifying sludge row mouth, 12-denitrification mud row mouth, 13-water outlet, 14-guide shell.
Embodiment
The present invention utilizes membrane separation assemblies to realize the technical process of synchronous nitration and denitrification Ammonia-Containing Wastewater Treatment as shown in Figure 1.Arrange membrane separation assemblies 2 in bio-reactor 1, membrane separation assemblies outside is nitrification zone 3, and inside is aerobic denitrification zone 4.Membrane separation assemblies adopts ceramic separation film, and film hole diameter is 0.05 μm ~ 0.5 μm.Membrane separation assemblies is 1:2 ~ 1:6 with the effective volume ratio of bio-reactor.Reactor is given prominence in membrane separation assemblies upper end, and the sidewall of protuberance sets out the mouth of a river 13, and water outlet establishes separatory membrane, ensures in water outlet not containing suspended substance.Establish aerating system 5 bottom bio-reactor, realize the back-mixing of nitrification zone and the oxygen needed for nitrification and denitrification is provided.Agitator 6 is established in membrane separation assemblies inside, realizes the abundant back-mixing of membrane separation assemblies inner counter nitrifying sludge.Bio-reactor also comprises guide shell 14, and membrane separation assemblies is positioned at inside guide shell, and aerating system is aeration outside guide shell.Aerating system adopts aeration plate, and aeration outlet is higher than guide shell lower end.
First nitrifying sludge and aerobic denitrification mud are joined respectively nitrification zone 3 and the aerobic denitrification zone 4 of bio-reactor.Then to be added in bio-reactor by ammonia-containing water by water-in 7 and process, nitrifying sludge carries out nitration reaction in nitrification zone, and aerobic denitrification mud carries out denitrogenation in denitrification zone, and the waste water composition inside and outside membrane separation assemblies is blended with intercommunication.PH value in detecting processing system, regulates pH to 6.0 ~ 9.0 of waste water by fluid infusion mouth 8 simultaneously.In treating processes, by mending carbon mouth 9, organic carbon source and course is added in membrane separation assemblies.The gas that aerobic denitrification and aeration produce is discharged by pneumatic outlet 10.When sludge excess, by mud discharging mouth 11 and 12, nitrifier and aerobic denitrifying bacteria are discharged a part.If processed continuously, processed waste water is discharged by water outlet 13.
In the inventive method, nitrifier is different with required nutritive substance with the growth conditions of aerobic denitrifying bacteria.Mineralized nitrogen in waste water is become nitre nitrogen and/or nitrite nitrogen by nitrifier, the nitre nitrogen produced and/or nitrite nitrogen can enter the inner substrate as aerobic denitrifying bacteria of membrane separation assemblies, nitre nitrogen and/or nitrite nitrogen are changed into gas, because the bodily form is comparatively large, tunicle retains mud, realize independent role, weaken different iuntercellular ecological impact.Simultaneously due to the effect of concentration difference, along with the carrying out of aerobic denitrification, nitre nitrogen and nitrite nitrogen constantly can enter the needs that membrane separation assemblies inside meets aerobic denitrifying bacteria; Simultaneously due to the reduction of product inhibition, contribute to the process and the effect that improve nitration reaction, the two complements each other and promotes, achieves the efficient removal of total nitrogen.
Below by embodiment, the present invention is described in further details.But therefore do not limit the present invention.
Embodiment 1
Adopt the reactor shown in Fig. 1 of the present invention.The effective volume of bio-reactor is 20L, and reactor adopts synthetic glass, has temperature control disk pipe in reactor, and the controller such as pH, dissolved oxygen.Establish guide shell in reactor, guide shell is hollow structure, and membrane separation assemblies is positioned at inside guide shell, and reactor bottom establishes aeration plate, aeration outside guide shell, and aeration exports higher than guide shell lower end, with the supply of the back-mixing and oxygen that realize nitrification zone.The effective volume of membrane separation assemblies is 10L, and adopt ceramic separation film, film hole diameter is 0.2 μm.Agitator is established in membrane separation assemblies inside, to realize the back-mixing of internal system.
First nitrifying sludge and aerobic denitrification mud are joined the nitrification zone of bio-reactor and aerobic denitrification zone respectively, then by water-in, ammonia-containing water is added in bio-reactor, the sludge concentration controlling nitrifying sludge is 3.0 ~ 4.0g/L, and the sludge concentration of aerobic denitrification mud is 2.0 ~ 3.0g/L.Adopt continuum micromeehanics, ammonia nitrogen concentration is 400mg/L, and hydraulic detention time is 12h.
In wastewater treatment process, add nitrifying sludge and the nutritive substance needed for aerobic denitrification sludge treatment waste water, to improve its reactive behavior.The proportioning of nutritive substance is: Fe
2+concentration is 0.05g/L, K
+concentration is 0.1g/L, Ca
2+concentration is 0.05g/L, Mg
2+concentration is 0.5g/L; PH value is 7.5.
PH value in detecting processing system simultaneously, regulates the pH to 7.5 of waste water.Temperature controls as inner coil pipe type of heating, and control temperature is 30 DEG C.Owing to establishing guide shell in reactor, guide shell can form internal recycle in membrane separation assemblies external region, causes the dissolved oxygen of different zones slightly different, and the dissolved oxygen concentration therefore controlling the outer then region of guide shell is 2.0 ~ 3.0mg/L.
Organic carbon source adopts methyl alcohol, and carbon-nitrogen mass ratio is 5:1, carries out stream add according to the spending rate of organic carbon source.When mud growth is superfluous, exceedes required sludge concentration, by mud discharging mouth, mud is discharged a part.Processed waste water is discharged by water outlet.
Run after 15 days, in water outlet, ammonia nitrogen concentration is lower than 5mg/L, and ammonia nitrogen removal frank reaches more than 98.8%.Total nitrogen concentration is less than 20mg/L, and nitrogen removal rate is greater than 95%.COD concentration is less than 50mg/L, and there do not have while the supply of guarantee organic carbon source to be excessive, and water outlet COD can not be caused to increase.Result is as shown in table 1.
Embodiment 2
Adopt the reactor shown in Fig. 1 of the present invention.The effective volume of bio-reactor is 20L, and reactor adopts synthetic glass, has temperature control disk pipe in reactor, and the controller such as pH, dissolved oxygen.Establish guide shell in reactor, guide shell is hollow structure, and membrane separation assemblies is positioned at inside guide shell, and reactor bottom establishes aeration plate, aeration outside guide shell, and aeration exports higher than guide shell lower end, with the supply of the back-mixing and oxygen that realize nitrification zone.The effective volume of membrane separation assemblies is 10L, and adopt ceramic separation film, film hole diameter is 0.5 μm.Agitator is established in membrane separation assemblies inside, to realize the back-mixing of internal system.
Nitrifying sludge and aerobic denitrification mud are granule sludge, first nitrifying granular activated sludge and aerobic denitrification particle sludge are joined the nitrification zone of bio-reactor and aerobic denitrification zone respectively, then by water-in, ammonia-containing water is added in bio-reactor, the sludge concentration controlling nitrifying sludge is 3.0 ~ 4.0g/L, and the sludge concentration of aerobic denitrification mud is 2.0 ~ 3.0g/L.Adopt continuum micromeehanics, ammonia nitrogen concentration is 800mg/L, and hydraulic detention time is 18h.
In wastewater treatment process, add nitrifying sludge and the nutritive substance needed for aerobic denitrification sludge treatment waste water, to improve its reactive behavior.The proportioning of nutritive substance is: Fe
2+concentration is 0.01g/L, K
+concentration is 0.5g/L, Ca
2+concentration is 0.1g/L, Mg
2+concentration is 0.05g/L; PH value is 7.0.
PH value in detecting processing system simultaneously, regulates the pH to 8.0 of waste water.Temperature controls as inner coil pipe type of heating, and control temperature is 35 DEG C.Owing to establishing guide shell in reactor, guide shell can form internal recycle in membrane separation assemblies external region, causes the dissolved oxygen of different zones slightly different, and the dissolved oxygen concentration therefore controlling the outer then region of guide shell is 1.0 ~ 2.0mg/L.
Organic carbon source adopts methyl alcohol, and carbon-nitrogen mass ratio is 4:1, carries out stream add according to the spending rate of organic carbon source.When mud growth is superfluous, exceedes required sludge concentration, by mud discharging mouth, mud is discharged a part.Processed waste water is discharged by water outlet.
Run after 15 days, in water outlet, ammonia nitrogen concentration is lower than 5mg/L, and ammonia nitrogen removal frank reaches more than 99.4%.Total nitrogen concentration is lower than 54mg/L, and nitrogen removal rate is greater than 93.3%.COD concentration is less than 40mg/L, and there do not have while the supply of guarantee organic carbon source to be excessive, and water outlet COD can not be caused to increase.Result is as shown in table 1.
Comparative example 1
Adopt the reactor identical with embodiment 1 and processing condition, do not adopt membrane separation assemblies, directly nitrifying sludge and aerobic denitrification mud are added in bio-reactor.Run after 15 days, in water outlet, ammonia nitrogen concentration is lower than 20mg/L, and ammonia nitrogen removal frank is 95%.Nitre nitrogen concentration is 21mg/L, and nitrite nitrogen concentration is 42 mg/L, and total nitrogen concentration is about 80mg/L, and nitrogen removal rate is 80%.COD concentration is about 150mg/L, because nitre nitrogen and nitrite nitrogen have accumulation, therefore causes the accumulation of COD.Result is as shown in table 1.
Comparative example 2
Adopt the reactor identical with embodiment 1 and processing condition, do not adopt membrane separation assemblies, first nitrifying sludge is added reactor, run 5 days after ammonia nitrogen removal is stable, then aerobic denitrification mud is added in membrane separation assemblies.Run after 15 days, in water outlet, ammonia nitrogen concentration is lower than 15mg/L, and ammonia nitrogen removal frank is 96.3%.Nitre nitrogen concentration is 17mg/L, and nitrite nitrogen concentration is 40mg/L, and total nitrogen concentration is about 70mg/L, and nitrogen removal rate is 82.5%.COD concentration is about 120mg/L, because nitre nitrogen and nitrite nitrogen have accumulation, therefore causes the accumulation of COD.Result is as shown in table 1.
The result of table 1 embodiment and comparative example
From table 1, although the ammonia nitrogen removal frank of comparative example is higher, nitrogen removal rate is lower, the removal effect of direct mixed influence total nitrogen.
Claims (12)
1. the method for a synchronous nitration and denitrification Ammonia-Containing Wastewater Treatment, it is characterized in that comprising following content: nitrifying sludge and aerobic denitrification mud are joined in the bio-reactor with built-in membrane separation assemblies, nitrifying sludge carries out nitration reaction in the external region of membrane separation assemblies, aerobic denitrification mud carries out denitrification denitrogenation at the interior region of membrane separation assemblies, the waste water intercommunication of exterior domain in membrane separation assemblies; Bio-reactor also comprises guide shell and aerating system, and guide shell is hollow structure, and membrane separation assemblies is positioned at inside guide shell, and aerating system is aeration outside guide shell.
2. method according to claim 1, is characterized in that: membrane separation assemblies adopts ceramic separation film, and film hole diameter is 0.05 ~ 0.5 μm.
3. method according to claim 1 and 2, is characterized in that: membrane separation assemblies is 1:2 ~ 1:6 with the effective volume ratio of bio-reactor.
4. method according to claim 1 and 2, is characterized in that: reactor is given prominence in membrane separation assemblies upper end, and the sidewall of protuberance sets out the mouth of a river, and water outlet establishes separatory membrane, ensures in water outlet not containing suspended substance.
5. method according to claim 1 and 2, is characterized in that: membrane separation assemblies inside is established agitator or passed into nitrogen aeration, realizes abundant back-mixing.
6. method according to claim 1, is characterized in that: aerating system adopts aeration plate, and aeration outlet is higher than guide shell lower end.
7. method according to claim 1, is characterized in that: nitrifying sludge and aerobic denitrification mud are granule sludge.
8. the method according to claim 1 or 7, is characterized in that: the sludge concentration controlling nitrifying sludge is 2.0 ~ 8.0g/L, and the sludge concentration of aerobic denitrification mud is 1.0 ~ 5.0g/L.
9. method according to claim 1, it is characterized in that: ammonia-containing water is the waste water containing COD and ammonia nitrogen, and ammonia nitrogen concentration is 100 ~ 1000mg/L, adopt batch water inlet or a continuum micromeehanics mode, adopt continuum micromeehanics mode, hydraulic detention time is 8 ~ 24 hours.
10. the method according to claim 1 or 9, is characterized in that: add the nutritive substance needed for sludge treatment ammonia-containing water, and the proportioning of nutritive substance is: Fe
2+concentration is 0.01 ~ 0.06g/L, K
+concentration is 0.05 ~ 0.5g/L, Ca
2+concentration is 0.01 ~ 0.1g/L, Mg
2+concentration is 0.05 ~ 0.5g/L; PH value is 6.5 ~ 7.5.
11. methods according to claim 1, it is characterized in that: according to carbon-nitrogen mass ratio for 3:1 ~ 10:1 adds organic carbon source needed for denitrification, organic carbon source is Soduxin, sodium acetate, methyl alcohol, glucose or cellulosic hydrolysate, with batch or continuous mode supplement organic carbon source.
12. methods according to claim 1, is characterized in that: the treatment condition of membrane separation assemblies external region are: control temperature is 20 ~ 40 DEG C, and pH value is 6 ~ 9, and dissolved oxygen concentration is 1 ~ 5mg/L; Maintenance aeration rate is constant, by controlling the oxygen concn in aeration, to ensure that membrane separation assemblies external region dissolved oxygen concentration is at 1 ~ 5mg/L.
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| CN113860494A (en) * | 2021-08-24 | 2021-12-31 | 江苏海洋大学 | Integrated wastewater denitrification process based on synchronous nitrification and denitrification |
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