CN103708615B - Single sludge system sequence batch (reaction unit of a kind of Low-carbon Urban Wastewater dephosphorization and short distance nitration and method - Google Patents
Single sludge system sequence batch (reaction unit of a kind of Low-carbon Urban Wastewater dephosphorization and short distance nitration and method Download PDFInfo
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Abstract
Single sludge system sequence batch (reaction unit and the method for a kind of Low-carbon Urban Wastewater dephosphorization and short distance nitration belong to municipal sewage treatment and resource recovery field.Described device comprises sequencing batch reactor, stirrer, aerator etc.Method: utilize and control sludge age, selectivity spoil disposal, maintain low dissolved axygen, time control semi-hitrosation, retain polyP bacteria, suppress nitrite-oxidizing bacteria, enriching ammonia oxidation bacterium, starts the microflora of taking as the leading factor with polyP bacteria and ammonia oxidizing bacteria fast, and optimize the microenvironment that polyP bacteria and ammonia oxidizing bacteria coexist, the ratio making water outlet phosphorus content reach one-level A standard, nitrite nitrogen and ammonia nitrogen is about 1:1.After sedimentation and drawing, innovatively anoxia stirring is carried out to precipitating sludge, utilize Inner source denitrification that residual nitrite nitrogen is reduced into nitrogen.The invention solves polyP bacteria and ammonia oxidizing bacteria can not the problem of harmonious coexistence in single sludge system, for dephosphorization autotrophic denitrification technique provides a kind of new approaches.
Description
Technical field
The invention belongs to city domestic sewage process and regeneration field.Particular by the control measures of improving technique, Sync enrichment polyP bacteria and ammonia oxidizing bacteria, thus the object realizing that in single sludge system dephosphorization and short distance nitration carry out simultaneously, for biological phosphate-eliminating and autotrophic denitrification provide new approaches.
Background technology
Along with the growth of economic level, the aggravation of mankind's activity, water pollution is more and more serious, and wherein phosphoric and nitrogen element pollution are a main harm, very big to the healthy effect of physical environment and the mankind.At present, be directed to the removal of phosphoric and nitrogen element, the many employings in municipal sewage plant based on the denitrification process of traditional enhanced biological phosphorus removal and nitrification-denitrification principle, as A
2/ O, oxidation ditch etc.Although these techniques for phosphoric and nitrogen unit have certain removal effect, need additional organic carbon source during the course, consume a large amount of basicity and the energy, and initial cost and operation cost higher.
Therefore, in recent years, investigator constantly found novel dephosphorization and denitrification process, to overcoming the shortcoming of traditional dephosphorization and denitrification process, reached energy-efficient object.1989, Dutch TNO researchist Mubler anaerobic fluidized bed carry out nitrogen equilibrium calculate time, finding wherein to exist a large amount of nitrogen loss (maximum reach 90%) can not explain with traditional nitrification-denitrification.So he infers under anaerobic state, may there is one just can by NH without the need to carbon source
4 +-N is oxidized to N
2process, just this conversion process has been declared patent for this reason.Along with research deepens continuously, this denitrification process anaerobic ammonia oxidation process without the need to carbon source because it has obvious advantage compared to traditional nitrification-denitrification technique denitrogenation mode, and is applied among actual sewage process engineering gradually.
Anaerobic ammonia oxidation process can not in sewage disposal to direct one step realize, all forms all to first have an appointment 50% NH
4 +-N is oxidized to NO by ammonia oxidizing bacteria
2 --N, could generate N under anaerobic ammonium oxidizing bacteria effect
2.Because ammonium oxidation bacterium and anaerobic ammonium oxidizing bacteria are all autotrophic bacterias, so the carbon source in sanitary sewage just all can be supplied to polyP bacteria be used for biological phosphate-eliminating.Therefore, " enhanced biological phosphorus removal+short distance nitration+Anammox technology " be the sewage treatment process of coupling because it does not need additional carbon, less energy-consumption, there is obvious sustainability, and become the focus that investigators constantly explore.
But, with " enhanced biological phosphorus removal+short distance nitration+Anammox " direct-coupled technique, still have its unavoidable defect.First, enhanced biological phosphorus removal stage easy secondary in precipitation process releases phosphorus, so biological phosphate-eliminating is difficult to reach country-level A standard (P≤0.5mg/L); Secondly, short distance nitration stability and be not easy to control.Aeration rate is excessive, and sludge age is too short, and extended aeration etc. all likely cause the destruction of short distance nitration; Finally, with " enhanced biological phosphorus removal+short distance nitration+Anammox " direct-coupled technique, its initial cost is higher, and complex structure, treating processes is tediously long.And the proposition of this patent, will from solving this three problems to a great extent.
This patent innovatively by polyP bacteria and ammonium oxidation Enrichment of bacteria in single sludge system, play the effect of its enhanced biological phosphorus removal and short distance nitration simultaneously, and obtain good effect.First, the release phosphorus of nitrite nitrogen to precipitate phase polyP bacteria that short distance nitration produces has restraining effect, makes the water outlet phosphorus content of biological phosphate-eliminating reach one-level A standard and is guaranteed; Secondly, preposition anaerobism stirs and is conducive to ammonia oxidizing bacteria utilization " being satiated with food inanition " suppression nitrite-oxidizing bacteria, thus improves the stability of short distance nitration; Finally, enhanced biological phosphorus removal and short distance nitration realize by this patent in a reactor, and this is for saving initial cost, and simplification structure of reactor and treating processes have very large realistic meaning.
Summary of the invention
The object of the present invention is to provide one Sync enrichment polyP bacteria and ammonia oxidizing bacteria under Low-carbon Urban Wastewater condition, integrate single sludge system sequence batch (reaction unit and the method for biological phosphate-eliminating and short distance nitration.
Technical scheme of the present invention is achieved in that
The invention provides single sludge system sequence batch (reaction unit of a kind of Low-carbon Urban Wastewater dephosphorization and short distance nitration.This device is provided with 1-water tank inlet, 2-intake pump, 3-sequencing batch reactor (SBR), 4-pneumatic pump, 5-spinner-type flowmeter, 6-stirrer, 7-timing controller, 8-siphon mud exhauster.Sanitary sewage is taken out sewage from water tank inlet by intake pump and is entered sequencing batch reactor, and sewage mixes with the active sludge in sequencing batch reactor by stirrer, then provides the air required for aeration by air, and controls the size of aeration rate by spinner-type flowmeter.All water inlets, stirring, aeration, draining are all controlled by timing controller;
1) arrange blow-down pipe bottom water tank inlet, water inlet pipe stretches into water tank inlet by top.Connect intake pump by water inlet pipe after water tank inlet, then access sequencing batch reactor.
2) stirrer of adjustable rotating speed is arranged at sequencing batch reactor (SBR) top, and aeration plate is arranged at bottom.Aeration plate is by the external aeration pump of aeration tube, and centre controls aeration rate by spinner-type flowmeter.In sequencing batch reactor, be provided with siphon mud exhauster, the mud at any position in reactor can be drawn neatly.
3) there is water outlet sequencing batch reactor (SBR) middle and lower part, and water outlet connects drain solenoid valve by rising pipe, then picks out sequencing batch reactor.
4) all monitoring instrument, comprise intake pump, stirrer, aeration pump, drain solenoid valve control by timing controller.
The invention provides a kind of method realizing biological removal of phosphorus in wastewater and short distance nitration at this device, it comprises two portions, quick start method and steady running method.
Quick start method:
1) first seed sludge in reactor: the mud that reactor is inoculated is municipal sewage plant A
2returned sluge in/O pond, seed sludge concentration is 4.0 ~ 5.0g/L;
2) city domestic sewage is added water tank inlet, changing water ratio is 1/3, regulates timing controller, prepares to run according to operation reserve.Concrete sanitary sewage water quality is as follows: COD is 120 ~ 280mg/L, and total phosphorus concentration (TP) is 6 ~ 8.5mg/L, ammonia nitrogen concentration (NH
4 +-N) be 50 ~ 75mg/L, nitrite nitrogen concentration < 1mg/L, nitrate nitrogen concentration < 1mg/L, basicity is with CaCO
3count 300 ~ 450mg/L, pH is 7.00 ~ 7.5, SS is 60 ~ 138mg/L.
3) strategy is started stage by stage:
First stage: wash mud: intake 20 minutes, precipitate 1 hour, draining 20 minutes.Run: water inlet 20min, anaerobism stirs 30min, and aeration agitation 5 hours, precipitates 1 hour, draining 20min.Controlling dissolved oxygen DO is 0.5 ~ 1.5mg/L, and when ammonia oxidation rate (AOR) reaches more than 70%, the mark first stage completes.
Subordinate phase: wash mud: intake 20 minutes, precipitates 1 hour, draining 20 minutes.Run: water inlet 20min, anaerobism stirs 30min, and aeration agitation 5 hours, precipitates 1 hour, draining 20min.Reducing dissolved oxygen DO is 0.2 ~ 0.5mg/L, and when ammonia oxidation rate is more than 60%, accumulation rate of nitrite nitrogen (NAR) reaches more than 95%, and subordinate phase completes.
Phase III: wash mud: intake 20 minutes, precipitate 1 hour, draining 20 minutes.Run: water inlet 20min, anaerobism stirs and extends to 4 hours.The time of aeration agitation regulated at 4 ~ 6 hours, finely tuned in units of 10min, when ammonia oxidation rate is less than 60%, extended the time of aeration agitation; When ammonia oxidation rate is greater than 60%, shorten aeration time, controlling ammonia oxidation rate is 57% ~ 63%.Precipitate 1 hour, draining 20min.Dissolved oxygen DO is kept to be 0.2 ~ 0.5mg/L, accumulation rate of nitrite nitrogen reaches more than 95%, water outlet phosphorus content is less than 0.5mg/L, and the phase III completes, and this also indicates that the microflora of taking as the leading factor with polyP bacteria (paos) and ammonia oxidizing bacteria (AOB) starts successfully.
Steady running method:
Water inlet 20min, anaerobism stirs 4 hours, and the time of aeration agitation regulated at 4 ~ 6 hours, finely tuned in units of 10min, when ammonia oxidation rate is less than 60%, extends the time of aeration agitation; When ammonia oxidation rate is greater than 60%, shorten aeration time, controlling ammonia oxidation rate is 57% ~ 63%.Dissolved oxygen DO is kept to be 0.2 ~ 0.5mg/L.After aeration agitation terminates, precipitate 1 hour, draining 20min.After sedimentation and drawing, carry out spoil disposal.Take off mud exhauster, utilize siphon sucking sludge, top layer of draining (within precipitating sludge thickness top 10%) mud, retain bottom mud, controlling sludge age is 20 ± 2 days.After draining, anoxia stirring is carried out to the muddy water mixed solution precipitated in reactor, utilize the Inner source denitrification under high sludge concentration condition that residual nitrite nitrogen is reduced into nitrogen, ensure the complete anaerobic environment in the phosphorus stage of releasing of next cycle.
Precaution: in steady running process, along with the fluctuation of influent quality, and some outside irresistible influence factors such as the change of climate temperature, phosphor-removing effect and accumulation rate of nitrite nitrogen do not have too large change substantially, but ammonia oxidation rate can not remain on 60% completely, just need this time to regulate aeration time a little.The time of aeration agitation finely tunes in units of 10min, when ammonia oxidation rate is less than 60%, extends the time of aeration agitation; When ammonia oxidation rate is greater than 60%, shorten aeration time, controlling ammonia oxidation rate is 57% ~ 63%.
The present invention, compared with the sewage water denitrification handling method of traditional cities, has the following advantages:
1) apparatus structure is simple, and easy to operate, level of automation is high, and quick start method and steady running method are easy to control.
2) the quick startup of single sludge microbe system of taking as the leading factor with polyP bacteria and ammonium oxidation bacterium is realized.
3) after steady running, phosphor-removing effect is effective, and water outlet total phosphorous is less than 0.5mg/L, reaches country-level A standard.Water outlet COD is generally at 35 ~ 50mg/L, and major part is all the organism of difficult for biological degradation.
4) short distance nitration effect stability, accumulation rate of nitrite nitrogen continues more than 95% always, and ammonia oxidation rate remains on about 60%, and the ratio of the sub-nitrogen of water outlet and ammonia nitrogen, between 1.2 ~ 1.4, can provide the water inlet of suitable proportion for anaerobic ammonia oxidation process.
Accompanying drawing illustrates:
Fig. 1 is sequence batch (reaction unit schematic diagram.
Fig. 2 be after precipitation top layer mud and bottom mud under the same conditions the maximum of unit suspended sludge concentration release phosphorus amount and nitrite nitrogen generating rate variation diagram.
Fig. 3 is ammonia oxidation rate in start-up course, accumulation rate of nitrite nitrogen, Inlet and outlet water total phosphorus concentration variation diagram.
Fig. 4 is ammonia oxidation rate (AOR) in steady running process, accumulation rate of nitrite nitrogen (NAR), water outlet total phosphorus concentration (TP), effluent COD concentration variation diagram.
Fig. 5 is ammonia nitrogen concentration, nitrite nitrogen concentration, nitrate nitrogen concentration, ammonia oxidation rate (AOR), accumulation rate of nitrite nitrogen (NAR), water outlet total phosphorus concentration (TP), the COD variation diagram of a typical cycle in steady running process.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but protection scope of the present invention is not limited thereto.
Single sludge system sequence batch (reaction unit of low-carbon (LC) carbon Phosphorus Removal from Municipal Wastewater of the present invention and short distance nitration and method, the present invention will be further described with example by reference to the accompanying drawings: as shown in Figure 1, and single sludge system sequence batch (reaction unit of low-carbon (LC) carbon Phosphorus Removal from Municipal Wastewater and short distance nitration comprises 1-water tank inlet, 2-intake pump, 3-sequencing batch reactor (SBR), 4-pneumatic pump, 5-spinner-type flowmeter, 6-stirrer, 7-timing controller, 8-siphon mud exhauster.
1) water tank inlet water level is controlled by float(ing)valve, and the change of water level can cause the fluctuation of intake pump flow, thus causes, into water shakiness, affecting the treatment effect of reactor.Water tank bottom arranges evacuated tube, because water inlet is sanitary sewage, impurities in water is more, arranges the frequent cleaning maintenance that evacuated tube is conducive to water tank.
2) the necessary stable conditions of intake pump, controls its switch by timing controller.Between intake pump and sequencing batch reactor, there is a gate valve, its role is to the size can finely tuning flooding velocity.
3) size of sequencing batch reactor has very important impact for the oxygen transfer efficiency of mixed solution, and reactor of the present invention is of a size of internal diameter 250mm, height 350mm, useful volume 15L.
4) the necessary stable conditions of pneumatic pump, controls its switch by timing controller.Between pneumatic pump and sequencing batch reactor, have a spinner-type flowmeter, the size of aeration rate is controlled by spinner-type flowmeter.
5) the necessary stable conditions of stirrer, controls its switch by timing controller.The speed stirred can not be too fast, otherwise can infiltrate the oxygen in air in anaerobic phosphorus release stage and anoxic denitrification stage, and can not keep the environment of its anaerobism and anoxic.This point is more obvious in the stirring of anoxic denitrification stage to precipitating sludge.
6) siphon mud exhauster principle utilizes siphon to extract the mud after precipitation out sequencing batch reactor, thus reach the object of spoil disposal.What the present invention's needs were drained is the mud precipitating rear top layer, the mud namely within glaur layer thickness top 10%.This needs siphon mud exhauster to draw mud enough neatly, instead of only rests on a some sucking sludge.The amount of sucking sludge is controlled by sludge age, and the sludge age that steady running of the present invention adopts is 20 ± 2 days.
The present invention realizes the method for low-carbon (LC) carbon Phosphorus Removal from Municipal Wastewater and short distance nitration in single sludge system sequence batch (reaction unit, and its thinking is:
1) quick start method:
Take from the active sludge in sewage work's dephosphorization process, preposition anaerobism is utilized to stir and low dissolved axygen aeration, retain polyP bacteria, suppress the growth of nitrite-oxidizing bacteria (NOB), enrichment ammonia nitrogen oxidizing bacteria, realizes the quick startup of the microflora of taking as the leading factor with polyP bacteria and ammonium oxidation bacterium.Startup of the present invention, different from the startup of only enrichment polyP bacteria and an enrichment ammonia nitrogen oxidizing bacteria, it needs Sync enrichment polyP bacteria and ammonia oxidizing bacteria in single sludge system.The mud of the present invention's inoculation is the active sludge in sewage work's dephosphorization process, there is a large amount of polyP bacterias, a small amount of nitrobacteria in mud.Therefore, be exactly cultivate stage of nitrobacteria in the present invention in the first stage started.
First stage: wash mud: intake 20 minutes, precipitate 1 hour, draining 20 minutes.Run: water inlet 20min, anaerobism stirs 30min, and aeration agitation 5 hours, precipitates 1 hour, draining 20min.Controlling dissolved oxygen DO is 0.5 ~ 1.5mg/L, and when ammonia oxidation rate reaches more than 70%, the mark first stage completes.First stage is exactly while reservation polyP bacteria, enrichment nitrobacteria.When ammonia oxidation rate reaches more than 70%, namely mean that the nitrobacteria in reactor reaches certain amount, the next stage of startup can be entered.
Subordinate phase: wash mud: intake 20 minutes, precipitates 1 hour, draining 20 minutes.Run: water inlet 20min, anaerobism stirs 30min, and aeration agitation 5 hours, precipitates 1 hour, draining 20min.Reducing dissolved oxygen DO is 0.2 ~ 0.5mg/L, and when ammonia oxidation rate is more than 60%, nitrosoation rate reaches more than 95%, and subordinate phase completes.The main purpose in this stage retains polyP bacteria, enrichment ammonia nitrogen oxidizing bacteria, suppresses nitrite-oxidizing bacteria.By reducing aeration rate, reaching low dissolved axygen, utilizing ammonia oxidizing bacteria oxygen affinity more better than nitrifier, thus suppress the growth of nitrifier, produce nitrite nitrogen accumulation, when accumulation rate of nitrite nitrogen reaches more than 95%, mark subordinate phase completes, and short distance nitration starts successfully.
Phase III: wash mud: intake 20 minutes, precipitate 1 hour, draining 20 minutes.Run: water inlet 20min, anaerobism stirs and extends to 4 hours.The time of aeration agitation finely tunes in units of 10min, when ammonia oxidation rate is less than 60%, extends the time of aeration agitation; When ammonia oxidation rate is greater than 60%, shorten aeration time, controlling ammonia oxidation rate is 57% ~ 63%.Precipitate 1 hour, draining 20min.Keep dissolved oxygen DO to be 0.2 ~ 0.5mg/L, nitrosoation rate reaches more than 95%, and water outlet phosphorus content is less than 0.5mg/L, and the phase III completes, and this also indicates that the microflora of taking as the leading factor with polyP bacteria and ammonium oxidation bacterium starts successfully.The main purpose of phase III recovers the activity of polyP bacteria, eluriates nitrifier further, controls ammonia oxidation rate, maintains the stable of short distance nitration, for steady running lays the first stone.
In start-up course, it is indispensable to wash this step of mud.If do not wash mud, the nitrite that upper one-period produces and nitrate can remain next cycle.There is the existence of nitrite and nitrate, the anaerobic environment releasing phosphorus stage needs can be destroyed, thus worsen the growing environment of polyP bacteria, cause phosphor-removing effect to be difficult to recover.By the startup of this three phases, the microflora of taking as the leading factor with polyP bacteria and ammonium oxidation bacterium is just calculated and is set up completely, and unloading phase completes.
2) steady running method:
Utilize and control sludge age, selectivity spoil disposal, maintain low aeration rate, time control semi-hitrosation technology, optimize the microenvironment that polyP bacteria and ammonium oxidation bacterium coexist in anaerobism/aeration sequencing batch reactor, reach phosphor-removing effect well, short distance nitration stablizes object.And after sedimentation and drawing, innovatively anoxia stirring is carried out to precipitating sludge, utilize Inner source denitrification that residual nitrite nitrogen is reduced into nitrogen, ensure that next cycle releases the complete anaerobic environment in phosphorus stage.
Operation method: water inlet 20min, anaerobism stirs 4 hours, aeration agitation 4 hours, precipitates 1 hour, draining 20min.After sedimentation and drawing, carry out spoil disposal.Open the mud discharging mouth of bottom, top layer of draining (within precipitating sludge thickness top 10%) mud, retain low layer mud, controlling sludge age is 20 ± 2 days.After spoil disposal, anoxia stirring is carried out to the mud of precipitation, utilizes the Inner source denitrification under high sludge concentration condition that residual nitrite nitrogen is reduced into nitrogen, ensure the complete anaerobic environment in the phosphorus stage of releasing of next cycle.
Sludge discharge way of the present invention is more special, run the row's of discovery top layer mud and more easily reach better phosphor-removing effect, and the load of short distance nitration is higher through long-term stability.In addition, have also been devised test to verify:
(1) test one: after precipitation, get bottom mud and the top layer mud of close concentration, analyze they under the same conditions the maximum of unit suspended sludge concentration release phosphorus amount.Show through test of many times result, top layer unit sludge concentration maximum is released phosphorus amount and is greater than the maximum of bottom unit sludge concentration and releases phosphorus amount.
(2) two are tested: after precipitation, get bottom mud and the top layer mud of close concentration, analyze the ammonium oxidation load of their unit suspended sludge concentration under the same conditions: show that result shows through test of many times result, the ammonia oxidation speed rate of top layer unit sludge concentration is less than the ammonia oxidation speed rate of bottom unit sludge concentration.
(3) analytical results: row top layer mud, compared to arranging the mud mixed, under identical sludge age, can discharge more polyP bacteria, less ammonia oxidizing bacteria.Thus realize requiring the polyP bacteria of short sludge age and the harmonious coexistence of the ammonia oxidizing bacteria of sludge age of will rectificating.
After spoil disposal, anoxia stirring is carried out to the mud of precipitation, utilizes the Inner source denitrification under high sludge concentration condition that residual nitrite nitrogen is reduced into nitrogen.When anoxia stirring, stirring velocity can not be too fast, otherwise easily infiltrate the oxygen in air, do not reach anaerobic environment.The time of stirring is determined according to the nitrite nitrogen content in residual solution, by the nitrite nitrogen reduction in sewage, ensures that the content of the nitrite nitrogen of the rear mixed solution of next cycle water inlet is zero.
Apparatus of the present invention structure is simple, and easy to operate, level of automation is high, and quick start method and steady running method are easy to control.After steady running, phosphor-removing effect is effective, and water outlet phosphorus content is less than 0.5mg/L, reaches country-level A standard.Water outlet COD is generally at 35 ~ 50mg/L, and major part is all the organism of difficult for biological degradation.Short distance nitration effect stability, nitrosoation rate continues more than 95% always, and ammonia oxidation rate remains on about 57%, and the ratio of the sub-nitrogen of water outlet and ammonia nitrogen is between 1.2 ~ 1.4.But present method still has the place much can improved, the time that such as anaerobism stirs can suitably reduce, and the aeration rate of aerobic aeration can suitably adjust, and water inlet water discharge time can be optimized further, and the level of automation of spoil disposal needs to improve.
Specific embodiment:
The municipal sewage plant A of inoculation
2returned sluge in/O pond, seed sludge concentration is 4.5g/L, and inoculum size is 15L.The present invention's hydromining community resident city domestic sewage, concrete sanitary sewage water quality is as follows: COD is 120 ~ 280mg/L, total phosphorus concentration is 6 ~ 8.5mg/L, ammonia nitrogen concentration is 50 ~ 75mg/L, nitrite nitrogen concentration < 1mg/L, nitrate nitrogen concentration < 1mg/L, basicity is with CaCO
3count 300 ~ 450mg/L, pH is 7.00 ~ 7.5, SS is 60 ~ 138mg/L.
The sequencing batch reactor that reactor adopts synthetic glass post to process, internal diameter 250mm, total height 350mm, effective volume 15L.As shown in Figure 1, single sludge system sequence batch (reaction unit of low-carbon (LC) carbon Phosphorus Removal from Municipal Wastewater and short distance nitration comprises 1-water tank inlet, 2-intake pump, 3-sequencing batch reactor (SBR), 4-pneumatic pump, 5-spinner-type flowmeter, 6-stirrer, 7-timing controller, 8-siphon mud exhauster.
Quick startup:
1) first seed sludge in reactor: the mud that reactor is inoculated is municipal sewage plant A
2returned sluge in/O pond, seed sludge concentration is 4.5g/L;
2) city domestic sewage is added water tank inlet, changing water ratio is 1/3, regulates timing controller, prepares to run according to operation reserve.
3) strategy is started stage by stage:
First stage: wash mud: intake 20 minutes, precipitate 1 hour, draining 20 minutes.Run: water inlet 20min, anaerobism stirs 30min, and aeration agitation 5 hours, precipitates 1 hour, draining 20min.Controlling dissolved oxygen DO is 0.5 ~ 1.5mg/L, and when running to the 9th day, ammonia oxidation rate reaches more than 70%, and the mark first stage completes.
Subordinate phase: wash mud: intake 20 minutes, precipitates 1 hour, draining 20 minutes.Run: water inlet 20min, anaerobism stirs 30min, and aeration agitation 5 hours, precipitates 1 hour, draining 20min.Reducing dissolved oxygen DO is 0.2 ~ 0.5mg/L, and when running to 22 days, ammonia oxidation rate is more than 57%, and accumulation rate of nitrite nitrogen reaches more than 95%, and subordinate phase completes.
Phase III: wash mud: intake 20 minutes, precipitate 1 hour, draining 20 minutes.Run: water inlet 20min, anaerobism stirs and extends to 4 hours, and the time of aeration agitation has just started to be 5 hours, and next aeration is finely tuned in units of 10min, when ammonia oxidation rate is less than 60%, extends the time of aeration agitation; When ammonia oxidation rate is greater than 60%, shorten aeration time, controlling ammonia oxidation rate is 57% ~ 63%.Precipitate 1 hour, draining 20min.Dissolved oxygen DO is kept to be 0.2 ~ 0.5mg/L, accumulation rate of nitrite nitrogen reaches more than 95%, and when running to 35 days, water outlet phosphorus content is less than 0.5mg/L, phase III completes, and this also indicates that the microflora of taking as the leading factor with polyP bacteria and ammonium oxidation bacterium starts successfully.Data variation about ammonia oxidation rate, accumulation rate of nitrite nitrogen and water outlet total phosphorus concentration is shown in Fig. 3.
Steady running method:
1) principle: utilize and control sludge age, selectivity spoil disposal, maintain low aeration rate, time control semi-hitrosation technology, in anaerobism/aeration sequencing batch reactor, optimize the microenvironment that polyP bacteria and ammonia oxidizing bacteria coexist, reach phosphor-removing effect good, short distance nitration stablizes object.And after sedimentation and drawing, innovatively anoxia stirring is carried out to precipitating sludge, utilize Inner source denitrification that residual nitrite nitrogen is reduced into nitrogen, ensure that next cycle releases the complete anaerobic environment in phosphorus stage.
2) operation method: water inlet 20min, anaerobism stirs 4 hours, and just started to be 5 hours, next aeration is finely tuned in units of 10min, when ammonia oxidation rate is less than 60%, extends the time of aeration agitation; When ammonia oxidation rate is greater than 60%, shorten aeration time, controlling ammonia oxidation rate is 57% ~ 63%.Aeration agitation to ammonia oxidation rate is about 60%, precipitates 1 hour, draining 20min.After sedimentation and drawing, carry out spoil disposal.Take off mud exhauster, utilize siphon sucking sludge, top layer of draining (within precipitating sludge thickness top 10%) mud, retain bottom mud, controlling sludge age is 20 ± 2 days.After spoil disposal, anoxia stirring is carried out to the mud of precipitation, utilizes the Inner source denitrification under high sludge concentration condition that residual nitrite nitrogen is reduced into nitrogen, ensure the complete anaerobic environment in the phosphorus stage of releasing of next cycle.
3) operational process:
At 1 ~ 30 day, this example continued to optimize the anoxia stirring to mud after draining.When anoxia stirring, stirring velocity can not be too fast, otherwise easily infiltrate the oxygen in air, do not reach anaerobic environment.The time of stirring is determined according to the nitrite nitrogen content in residual solution, and by the nitrite nitrogen reduction in sewage, ensure that the content of the nitrite nitrogen of the rear mixed solution of next cycle water inlet is zero, the anoxia stirring time adopted in example is 1 hour.
After 30 days, this example adopts and falls the method that gradient selects sludge age, determines the optimal sludge age of the present invention, and continues to optimize sludge discharge way, and the row's of drawing top layer mud is better than the conclusion of arranging bottom mud.30 ~ 60 days, adopt sludge discharge way for row's bottom mud, controlling sludge age was 40 days.Keep ammonia oxidation rate to be about 60%, sub-nitrogen accumulation rate is more than 95%, and after stable, water outlet phosphorus content mean value is at 3.609mg/L.61 ~ 91 days, adopt sludge discharge way for row's bottom mud, controlling sludge age was 20 days.Keep ammonia oxidation rate to be about 60%, sub-nitrogen accumulation rate is more than 95%, and after stable, water outlet phosphorus content mean value is at 1.439mg/L.92 ~ 122 days, adopt sludge discharge way for row's bottom mud, controlling sludge age was 10 days.Keep ammonia oxidation rate to be about 60%, sub-nitrogen accumulation rate is more than 95%, and after stable, water outlet phosphorus content mean value is at 0.927mg/L.123 ~ 153 days, adopt sludge discharge way for row top layer mud, controlling sludge age was 40 days.Keep ammonia oxidation rate to be about 60%, sub-nitrogen accumulation rate is more than 95%, and after stable, water outlet phosphorus content mean value is at 2.769mg/L.154 ~ 214 days, adopt sludge discharge way for row top layer mud, controlling sludge age was 20 days.Keep ammonia oxidation rate to be about 60%, sub-nitrogen accumulation rate is more than 95%, and reach steady state after 10 days, water outlet phosphorus content mean value is at 0.245mg/L.In steady running process, the data variation of ammonia oxidation rate (AOR), accumulation rate of nitrite nitrogen (NAR), water outlet total phosphorus concentration (TP), effluent COD concentration is shown in Fig. 4.
After steady running is known clearly nearly 2 months, to a typical cycle, do once about the data analysis (see figure 5) of ammonia nitrogen concentration, nitrite nitrogen concentration, nitrate nitrogen concentration, ammonia oxidation rate (AOR), accumulation rate of nitrite nitrogen (NAR), total phosphorus (TP), COD.As can be seen from data, after steady running, phosphor-removing effect is effective, and water outlet phosphorus content is less than 0.5mg/L, reaches country-level A standard.Water outlet COD is generally at 35 ~ 50mg/L, and major part is all the organism of difficult for biological degradation.Short distance nitration effect stability, nitrosoation rate continues more than 95% always, and ammonia oxidation rate remains on about 57%, and the ratio of the sub-nitrogen of water outlet and ammonia nitrogen is between 1.2 ~ 1.4.Apparatus of the present invention structure is simple, and easy to operate, level of automation is high, and quick start method and steady running method are easy to control.Innovatively by polyP bacteria and ammonium oxidation Enrichment of bacteria in single sludge system, play the effect of its enhanced biological phosphorus removal and short distance nitration simultaneously, and obtain good effect.Single sludge system sequence batch (reaction unit of this Low-carbon Urban Wastewater dephosphorization and short distance nitration and method can have good application prospect to be its advantage once: first, the release phosphorus of nitrite to precipitate phase polyP bacteria that short distance nitration produces has restraining effect, makes the water outlet phosphorus content of biological phosphate-eliminating reach one-level A standard and is guaranteed; Secondly, preposition anaerobism stirs and is conducive to ammonia oxidizing bacteria utilization " being satiated with food inanition " suppression nitrite-oxidizing bacteria, thus improves the stability of short distance nitration; Finally, enhanced biological phosphorus removal and short distance nitration realize by this patent in a reactor, and this is for saving initial cost, and simplification structure of reactor and treating processes have very large realistic meaning.
Claims (2)
1. a single sludge system sequence batch (reaction unit for Low-carbon Urban Wastewater dephosphorization and short distance nitration, is characterized in that: be provided with water tank inlet, intake pump, sequencing batch reactor, pneumatic pump, spinner-type flowmeter, stirrer, timing controller and siphon mud exhauster;
1) arrange blow-down pipe bottom water tank inlet, water inlet pipe stretches into water tank inlet by top; Water tank inlet connects intake pump by water inlet pipe, then accesses sequencing batch reactor;
2) stirrer of adjustable rotating speed is arranged at sequencing batch reactor top, and aeration plate is arranged at bottom; Aeration plate is by the external aeration pump of aeration tube, and centre controls aeration rate by spinner-type flowmeter; The siphon mud exhauster can drawing the mud at any position in reactor is provided with in sequencing batch reactor; There is water outlet sequencing batch reactor middle and lower part, and water outlet connects drain solenoid valve by rising pipe, then picks out sequencing batch reactor;
3) all monitoring instrument, comprise intake pump, stirrer, aeration pump, drain solenoid valve control by timing controller.
2. a kind of Low-carbon Urban Wastewater dephosphorization of application rights requirement described in 1 and single sludge system sequence batch (reaction unit of short distance nitration, realize the method for biological removal of phosphorus in wastewater and short distance nitration, its feature comprises the following steps:
Quick start method:
1) first seed sludge in reactor: the mud that reactor is inoculated is municipal sewage plant A
2returned sluge in/O pond, seed sludge concentration is 4.0 ~ 5.0g/L;
2) city domestic sewage is added water tank inlet, changing water ratio is 1/3, regulates timing controller, prepares to run according to operation reserve; Concrete sanitary sewage water quality is as follows: COD is 120 ~ 280mg/L, total phosphorus concentration is 6 ~ 8.5mg/L, and ammonia nitrogen concentration is 50 ~ 75mg/L, nitrite nitrogen concentration < 1mg/L, nitrate nitrogen concentration < 1mg/L, basicity is with CaCO
3count 300 ~ 450mg/L, pH is 7.00 ~ 7.5, SS is 60 ~ 138mg/L;
3) strategy is started stage by stage:
First stage: wash mud: intake 20 minutes, precipitate 1 hour, draining 20 minutes; Run: water inlet 20min, anaerobism stirs 30min, and aeration agitation 5 hours, precipitates 1 hour, draining 20min; Controlling dissolved oxygen DO is 0.5 ~ 1.5mg/L, and when ammonia oxidation rate reaches more than 70%, the mark first stage completes;
Subordinate phase: wash mud: intake 20 minutes, precipitates 1 hour, draining 20 minutes; Run: water inlet 20min, anaerobism stirs 30min, and aeration agitation 5 hours, precipitates 1 hour, draining 20min; Reducing dissolved oxygen DO is 0.2 ~ 0.5mg/L, and when ammonia oxidation rate is more than 60%, accumulation rate of nitrite nitrogen reaches more than 95%, and subordinate phase completes;
Phase III: wash mud: intake 20 minutes, precipitate 1 hour, draining 20 minutes; Run: water inlet 20min, anaerobism stirs 4 hours; The time of aeration agitation regulated at 4 ~ 6 hours, finely tuned in units of 10min, when ammonia oxidation rate is less than 60%, extended the time of aeration agitation; When ammonia oxidation rate is greater than 60%, shorten aeration time, controlling ammonia oxidation rate is 57% ~ 63%; Precipitate 1 hour, draining 20min; Keep dissolved oxygen DO to be 0.2 ~ 0.5mg/L, accumulation rate of nitrite nitrogen reaches more than 95%, and water outlet phosphorus content is less than 0.5mg/L, and the phase III completes, and this also indicates that the microflora of taking as the leading factor with polyP bacteria and ammonia oxidizing bacteria starts successfully;
Steady running method:
Water inlet 20min, anaerobism stirs 4 hours, and the time of aeration agitation regulated at 4 ~ 6 hours, finely tuned in units of 10min, when ammonia oxidation rate is less than 60%, extends the time of aeration agitation; When ammonia oxidation rate is greater than 60%, shorten aeration time, controlling ammonia oxidation rate is 57% ~ 63%; Dissolved oxygen DO is kept to be 0.2 ~ 0.5mg/L; After aeration agitation terminates, precipitate 1 hour, draining 20min; After sedimentation and drawing, carry out spoil disposal; Take off mud exhauster, utilize siphon sucking sludge, mud within drain top layer and precipitating sludge thickness top 10%, retain bottom mud, controlling sludge age is 20 ± 2 days; After draining, anoxia stirring is carried out to the muddy water mixed solution precipitated in reactor, utilize the Inner source denitrification under high sludge concentration condition that residual nitrite nitrogen is reduced into nitrogen, ensure the complete anaerobic environment in the phosphorus stage of releasing of next cycle.
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| CN104944581B (en) * | 2015-06-23 | 2017-04-12 | 北京工业大学 | Device and method for achieving denitrifying phosphorus removal coupling short-range interior source denitrification treatment of low-carbon city sewage by means of single-level SBR |
| CN105565597A (en) * | 2015-12-22 | 2016-05-11 | 浙江工商大学 | Enhanced biological phosphorus removal apparatus and method quickly recoverable from inhibition of nitrites |
| CN108640265B (en) * | 2018-05-28 | 2024-01-23 | 广州市市政工程设计研究总院有限公司 | Quick start device and method for shortcut nitrification of urban domestic sewage at normal temperature and low carbon nitrogen ratio |
| CN109748393B (en) * | 2019-02-21 | 2023-12-01 | 北京工业大学 | Device and method for enhancing anaerobic ammonia oxidation activity and improving aerobic nitrogen removal |
| CN114426335B (en) * | 2020-10-29 | 2023-07-04 | 中国石油化工股份有限公司 | Co-enrichment method of nitrifying bacteria and denitrifying phosphorus accumulating bacteria |
| CN113845213B (en) * | 2021-10-20 | 2023-07-04 | 广西博世科环保科技股份有限公司 | Sequencing batch aerobic activated sludge process regulation and control method |
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| CN102786142A (en) * | 2012-07-24 | 2012-11-21 | 北京工业大学 | Device and method for partial nitrosation of low carbon municipal sewage |
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