CN103086511B - Method for enhancing nitrogen and phosphorus removal of urban sewage by sludge fermentation - Google Patents
Method for enhancing nitrogen and phosphorus removal of urban sewage by sludge fermentation Download PDFInfo
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- CN103086511B CN103086511B CN201210572728.2A CN201210572728A CN103086511B CN 103086511 B CN103086511 B CN 103086511B CN 201210572728 A CN201210572728 A CN 201210572728A CN 103086511 B CN103086511 B CN 103086511B
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000000855 fermentation Methods 0.000 title claims abstract description 45
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- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 30
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 23
- 239000011574 phosphorus Substances 0.000 title claims abstract description 23
- 230000002708 enhancing effect Effects 0.000 title abstract 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 121
- 238000005273 aeration Methods 0.000 claims description 17
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- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a method for enhancing nitrogen and phosphorus removal of urban sewage by sludge fermentation, relates to the coupling control technology of sludge fermentation enhanced nitrogen and phosphorus removal technology and sludge fermentation technology, and belongs to the fields of urban sewage treatment and sludge biochemical treatment. The method employs a sequencing batch reactor to couple the sludge fermentation effect and the urban sewage nitrogen and phosphorus removal effect into a same system, so that easily degradable carbon source generated by sewage fermentation can be consumed timely by phosphorus-accumulating bacterium and denitrifying bacterium, the nitrogen removal effect of the urban sewage with a low C/N ratio is enhanced, the problem of lowered fermentation reacting rate caused by accumulation of products in the fermentation process is avoided, and the initial stabilization of primary sludge is achieved at the same time. The method for enhancing nitrogen and phosphorus removal of urban sewage by sludge fermentation is applicable to the enhanced nitrogen and phosphorus removal of the urban sewage with low C/N ratio and C/P ratio and the initial decrement and stabilization of the sludge. The method for enhancing nitrogen and phosphorus removal of urban sewage by sludge fermentation is saving in carbon source and improved in nitrogen removal efficiency, and has the advantages of simple equipment, flexible operation, high nitrogen removal efficiency and the like.
Description
Technical field
The present invention relates to the coupling control technology of urban sewage strengthening denitrogenation dephosphorization technique and sludge fermentation technology, belong to municipal sewage treatment and mud biochemical treatment field.This technique is applicable to low C/N ratio, C/P than the preliminary decrement of the intensified denitrification and dephosphorization of municipal effluent and mud and stable.
Background technology
It is that COD is less than 50mg/L that China requires all pollutant discharging units effluent quality in the < < urban wastewater treatment firm pollutant emission standard > > (GB18918-2002) promulgating for 2002, ammonia nitrogen is less than 5mg/L, total nitrogen is less than 15mg/L, and total phosphorus is less than 0.5mg/L(one-level A standard).During 11th Five-Year, COD discharge is effectively controlled, but the environmental capacity problem of nitrogen, phosphorus discharge super receiving water body far away can not be ignored.For arriving the emission standard of increasingly stringent, reduce running cost, many Sewage Plant face optimization operation or the upgrading problem of technique.
In biological denitrification process, heterotrophic denitrifying Bacteria need to utilize organism as electron donor reduction-oxidation state nitrogen, comprises nitric nitrogen and nitrite nitrogen.Yet C/N is low for the current ubiquity water inlet of municipal sewage treatment, the insufficient problem of carbon source, causes water outlet TN to be difficult to up to standard.By adding the outer carbon sources such as methyl alcohol, can reach good outlet effect, but expense is quite large, has the excess sludge production of increase simultaneously, break the original carbon balance of sewage work, increase CO
2the problems such as isothermal chamber gas purging.Biological phosphate-eliminating also needs high-quality carbon source, and due to the restriction of water-inlet carbon source, sewage work generally adopts follow-up coagulating sedimentation, toward dosing coagulant in second pond water outlet to reach the object of the phosphorus in liquid phase being transferred to solid phase.Although obtain good phosphor-removing effect, the problem such as inevitably bring processing cost to improve, chemically precipitated sludge amount is large.This part mud has aggravated the sludge treatment predicament of Sewage Plant, and how cost-effectively treatment and disposal mud is also the difficult problem that numerous sewage works face.
And carry out sludge fermentation, can play the effect of effective decrement and stabilized sludge.As avoided during the fermentation the generation of methanogenesis, macromole organic granular in mud is transformed to small molecules such as voltaile fatty acids, and utilized by denitrifying bacteria and dephosphorization bacterial, can alleviate low C/N, C/P than the carbon resource shortage problem of municipal effluent, improve the Nitrogen/Phosphorus Removal of system.The method is compared traditional technology can save additional carbon and flocculation medicament, and reduce processing cost and working cost, and carry out the preliminary decrement of mud simultaneously and stablize, be the technique that meets Sustainable development rule, there is larger practical significance, application market is wide.
Traditional sludge fermentation and carbon source extractive technique are generally fermentation-elutriation technique, be that mud acidication in fermentation vat produces voltaile fatty acid etc. and can utilize organism, and utilize water inlet to eluriate the tunning in fermentation vat, eluriate subsequently liquid and be driven into bio-reaction zone in order to strengthen Nitrogen/Phosphorus Removal.In actual Practical Project, if utilize compounded carbons in fermentation-elutriation process exploitation mud, there are some inferior positions: 1) due to the adsorption of mud, the VFA that fermentation produces is difficult to be eluriated out, and want higher elutriation efficiency and need the larger elutriation water yield, and it is lower to eluriate efficiency, mud-water separation difficulty; 2) in the reactor of complete anaerobism, be difficult to avoid producing methane reaction and occur, and particulate matter hydrolysis is the rate-limiting step of sludge anaerobic fermentation, so tunning is consumed in a large number by methanogen; 3) for reaching higher elutriation efficiency, need larger elutriation water consumption, certainly lead to larger upflow velocity, take a lot of particulate matters out of, increased the solid loading of subsequent disposal unit.
Just the method for heavy fermentation strengthening municipal effluent denitrogenation dephosphorizing is that technique is developed-utilized to a kind of novel carbon source.Tool has the following advantages: 1) due to NO
x -the existence of-N, the generation of having avoided producing methane reaction, has prevented that tunning from being consumed by methanogen; 2) tunning, immediately by denitrifying bacterium local use around after producing, stimulates sludge fermentation to produce the carbon sources of utilizing more; 3) anti-nitration reaction produces basicity, can make reactor remain under the condition of neutrality or meta-alkalescence and move, and carries out pH rise to 8 left and right with denitrification, has avoided the system acidifying problem in normal fermentation; 4) utilize Denitrifying Phosphate Accumulating Organisms, denitrogenation and dephosphorization are coupling in sludge fermentation system, the effect of reach " carbon is dual-purpose ", mutually promoting; 5) omit the elutriation step in traditional technology, technique main body only needs two sbr reactor devices, moves simple to operationly, and replicability is strong.
Summary of the invention
The present invention utilizes sequencing batch reactor, the denitrogenation of sludge fermentation effect and municipal effluent and the effect of dephosphorization process are coupling in same system, the easy degraded carbon source that sludge fermentation is produced can be consumed by polyP bacteria and denitrifying bacterium in time, strengthened low C/N than the denitrification effect of municipal effluent, avoid the problem that causes fermentation reaction speed to slow down because of product accumulation in fermenting process, realized the preliminarily stabilised of primary sludge simultaneously.
The present invention is achieved through the following technical solutions:
The method of sludge fermentation strengthening municipal effluent denitrogenation dephosphorizing, it is characterized in that processing low C/N ratio, low C/P is than municipal effluent and make mud obtain the method for preliminarily stabilised, and its device comprises former water tank, the sequencing batch reactor SBR connecting in turn
1, intermediate water tank, sequencing batch reactor SBR
2and mud retention tank.Former water tank is by intake pump and sequencing batch reactor SBR
1be connected, sequencing batch reactor SBR
1by outlet pipeline, be connected with intermediate water tank, intermediate water tank is by middle water pump and sequencing batch reactor SBR
2be connected.Middle water pump connects admission passage simultaneously.Mud retention tank is by adding dredge pump and sequencing batch reactor SBR
2be connected.Sequencing batch reactor SBR
1interior aeration head is connected with air compressor.Sequencing batch reactor SBR
1the first agitator and the first temperature-control device are installed; Sequencing batch reactor SBR
2middle installation the second agitator and the second temperature-control device.Sequencing batch reactor SBR
1middle installation DO on-line determination instrument, a pH on-line determination instrument; Sequencing batch reactor SBR
2middle installation ORP on-line determination instrument and the 2nd pH on-line determination instrument.The process controller that is connected with computer is set in addition in order to receive the signal of above-mentioned DO on-line determination instrument, a pH on-line determination instrument, ORP on-line determination instrument, the 2nd pH on-line determination instrument, meanwhile, computer is connected with air compressor, the first agitator and the second agitator by process controller.
The device of sludge fermentation strengthening municipal effluent denitrogenation dephosphorizing is realized the method for controlling, and it is characterized in that comprising the following steps:
Sequencing batch reactor SBR
1process low C/N ratio, low C/P than sanitary sewage, each cycle experiences water inlet, anoxia stirring, water inlet, anaerobism stirring, aeration, precipitation, 7 processes of draining successively.
It is 1/4 of reactor useful volume that flooding quantity is set in I water inlet, by time switch, controls.After system starts, the sewage in former water tank enters into sequencing batch reactor SBR by intake pump
1, in the time of water inlet, open the first agitator.
After the water inlet of II anoxic, enter the anoxic period, in reactor, after upper cycle draining, remaining nitrification liquid utilizes the carbon source in former water to carry out denitrification, removes total nitrogen.Setting the denitrification time is 30 minutes.
It is 1/4 of reactor useful volume that flooding quantity is for the second time set in III water inlet, by time switch, controls, and the sewage in former water tank enters into sequencing batch reactor SBR by intake pump
1.
IV anaerobism anaerobic state, it is used that the carbon source of polyP bacteria utilization in intaking for the second time carried out anaerobic phosphorus release, and the time is set as 30 ~ 60 minutes.
V aeration is opened air compressor, to sequencing batch reactor SBR
1oxygen is provided, and is oxidation state nitrogen NO by the mineralized nitrogen in water inlet
x -; According to on-line monitoring DO and pH, as 1. dpH/dt>=0 and t>=2h or when 2. d DO/dt > 1 and t>=2h occur, the output signal A by process controller controls air compressor and the first agitator stops, and aeration finishes.
It is 10-30 minute that VI precipitation is set sedimentation time, and precipitate phase completes mud-water separation.
It is 1/2 that draining ratio is set in VII draining, by time switch, controls.Flowing water Valve is opened, and supernatant liquor is discharged into intermediate water tank.
Sequencing batch reactor SBR
2alternately under anaerobic-anoxic-limit oxygen environment, moving, the mixing sludge of primary sludge and excess sludge of take is fermentation substrate, can synchronously carry out sludge fermentation and denitrification denitrogenation, dephosphorization process.The ratio of just heavy mud/residue mud dry weight is between 0 ~ 2.Sequencing batch reactor SBR
2each cycle experiences successively anaerobism, water inlet, anoxic, aerobic, precipitation, draining, changes 7 processes of mud.
I anaerobism starts the second agitator, and anaerobically fermenting starts, and fermentation time is set to 9-20 hour.
It is 1/2 of reactor useful volume that flooding time is set in II water inlet, by time switch, controls.Nitrification liquid in intermediate water tank enters into sequencing batch reactor SBR by middle water pump
2.
III anoxic denitrification bacterium utilizes tunning to carry out denitrification after water inlet, by NO
x -be reduced into nitrogen, polyP bacteria is with NO simultaneously
x -as electron acceptor(EA), carry out denitrifying phosphorus uptake.When denitrification is carried out, sludge fermentation reaction is also proceeded.According to on-line monitoring pH and ORP, when 1. dpH/dt≤0 and t >=30 minute or when 2. d ORP/dt≤-50 and t >=30 minute occur, close the second agitator, the anoxia stirring period finishes.
The aerobic unlatching intake valve of IV and middle water pump, squeeze into sequencing batch reactor SBR by air
2.Set of time is 30 minutes, controls dissolved oxygen DO0.4-0.5mg/L, so that the condition of synchronous nitration and denitrification to be provided, and the COD that further removes the phosphoric acid salt in mixed solution and do not utilize.
It is 1-2 hour that V precipitation is set sedimentation time, and precipitate phase completes mud-water separation.
It is 1/2 that draining ratio is set in VI draining, by time switch, controls.Flowing water Valve is opened, and supernatant liquor is discharged through outlet pipeline.
VII is changed mud and is opened the second agitator, after mud mixes from sequencing batch reactor SBR
2discharge mud.Spoil disposal volume is made as sequencing batch reactor SBR
21/20 of useful volume.After spoil disposal finishes, open and add dredge pump, mud enters sequencing batch reactor SBR from mud retention tank
2, it is identical with spoil disposal volume that setting adds mud volume.
Extract, utilize technology to compare with traditional sludge fermentation-carbon source, this invention tool has the following advantages:
1) at sequencing batch reactor SBR
1middle employing segmental influent technology, reinforced anaerobic is released phosphorus process, for follow-up abundant suction phosphorus lays the first stone; At sequencing batch reactor SBR
2middle anaerobic-anoxic-oxic circulates as biological phosphate-eliminating provides complete approach, and water outlet total phosphorous is low.
2) nitrobacteria is at sequencing batch reactor SBR
1in obtain enrichment, rate of nitrification is faster than conventional system, ammonia nitrogen removal is effective; At sequencing batch reactor SBR
1in the excessive release of ammonia nitrogen in follow-up anoxic, the effective stopping fermentation process of aerobic processes, and provide ammonia nitrogen removal approach, water outlet ammonia nitrogen concentration is low.
3) sludge fermentation system and municipal effluent denitrification denitrogenation and dephosphorization are coupling in same system, polyP bacteria and denitrifying bacteria original position utilize tunning as carbon source, the product that can remove in time sludge fermentation process suppresses, the activity of methanogen is suppressed, and the carbon source that fermentation produces can efficiently be utilized for denitrification denitrogenation nitrogen and polyP bacteria.
4) adopt sequencing batch reactor, each period of technique can be adjusted flexibly according to practical situation, and easy and simple to handle, controllability is strong.The main body experimental installation design that need not too much reflux of invention, saves energy consumption and construction, overhead charges greatly.
Accompanying drawing explanation
Fig. 1 is the structural representation of apparatus of the present invention
In figure: 1---former water tank; 2---intake pump; 3---sequencing batch reactor SBR
1; 4---intermediate water tank; 5---middle intake pump; 6---sequencing batch reactor SBR
2; 7---mud retention tank; 8---add dredge pump; 9---outlet pipeline; 10---air compressor; 11---the first agitator; 12---the second agitator; 13---DO on-line determination instrument; 14---a pH on-line determination instrument; 15---ORP on-line determination instrument; 16---the 2nd pH on-line determination instrument; 17---process controller; 18---computer; 19---the first temperature-control device; 20---the second temperature-control device.
Embodiment
By reference to the accompanying drawings with example to the application's patent further instruction: as shown in Figure 1, the present invention includes the former water tank, the sequencing batch reactor SBR that connect in turn
1, intermediate water tank, sequencing batch reactor SBR
2and mud retention tank.The effective volume of its Central Plains water tank is 50L, and casing is made by organic plastics; Sequencing batch reactor SBR
1with sequencing batch reactor SBR
2effective volume be 10L, be cylindrical synthetic glass cylinder; The effective volume of intermediate water tank and mud retention tank is 15L, and casing is made by organic plastics.
Its device comprises former water tank 1, the sequencing batch reactor SBR connecting in turn
13, intermediate water tank 4, sequencing batch reactor SBR
26 and mud retention tank 7; Former water tank 1 is by intake pump 2 and sequencing batch reactor SBR
13 are connected, sequencing batch reactor SBR
1by pipeline, be connected with intermediate water tank 4, intermediate water tank 4 is by middle water pump 5 and sequencing batch reactor SBR
26 are connected; Middle water pump 5 connects admission passage simultaneously; Mud retention tank 7 is by adding dredge pump 8 and sequencing batch reactor SBR
26 are connected; Sequencing batch reactor SBR
1aeration head in 3 is connected with air compressor 10; Sequencing batch reactor SBR
13 install the first agitator 11 and the first temperature-control device 19; Sequencing batch reactor SBR
2the second agitator 12 and the second temperature-control device 20 are installed in 6; Sequencing batch reactor SBR
1dO on-line determination instrument 13, a pH on-line determination instrument 14 are installed in 3; Sequencing batch reactor SBR
2oRP on-line determination instrument 15 and the 2nd pH on-line determination instrument 16 are installed in 6; The process controller 17 that is connected with computer 18 is set in addition in order to receive the signal of above-mentioned DO on-line determination instrument 13, a pH on-line determination instrument 14, ORP on-line determination instrument 15, the 2nd pH on-line determination instrument 16, meanwhile, computer 18 is connected with air compressor 10, the first agitator 11 and the second agitator 12 by process controller 17;
The city domestic sewage that specific embodiment is used is taken from the septic tank of dependents' district, Beijing, its typical ammonia nitrogen concentration value is at 65 ~ 80mg/L, phosphate concn is 5.3 ~ 7.7mg/L, COD is 220 ~ 270mg/L, its C/N<4, C/P<45, self carbon source is not enough to fully remove total nitrogen and the total phosphorus in former water.Sequencing batch reactor SBR
1seed sludge take from the excess sludge of certain pilot scale SBR, this sludge denitrification is respond well, and has certain short distance nitration ability, sequence batch (nitrator SBR in service
1mLSS be 3000 ~ 4000mg/L.Sequencing batch reactor SBR
2inoculation mud take from the pressure pipeline after the Sewage Plant primary sludge gravity concentration tank of Beijing, be typical primary sludge, concentration 10kgMLSS/m
3, the ratio of volatile sludge concentration MLVSS and sludge concentration MLSS is between 0.55～0.60.In mud retention tank, be the mixed soil of above-mentioned primary sludge and excess sludge, just the ratio of heavy mud/residue mud dry weight is between 0 ~ 2, and sludge concentration MLSS is 8000 ~ 10000mg/L.Sequencing batch reactor SBR
1with sequencing batch reactor SBR
2useful volume is 10L, each cycle water inlet 5L, and temperature of reaction is controlled at 26 ℃.Detailed process is as follows:
Embodiment mono-:
Sequencing batch reactor SBR
1process low C/N than sanitary sewage, each cycle experiences water inlet, anoxic, water inlet, anaerobism, aeration, precipitation, 7 processes of draining successively.
The flooding quantity that I water inlet arranges intake pump be 500ml/minute, intake 5 minutes.After system starts, the sewage in former water tank enters into sequencing batch reactor SBR by intake pump
1, in the time of water inlet, open the first agitator.
After the water inlet of II anoxic, enter the anoxic period, setting the denitrification time is 30 minutes.
The flooding quantity that III water inlet arranges intake pump be 500ml/minute, intake 5 minutes.
IV anaerobism is intake for the second time and is completely entered the anaerobism period, and polyP bacteria utilizes the carbon source in former water to carry out anaerobic phosphorus release effect, and the time is set as 45 minutes.
V aeration is opened air compressor, to sequencing batch reactor SBR
1oxygen is provided, and aeration rate is constant in 40L/ hour, and sewage is fully contacted with active sludge.According to on-line monitoring DO and pH, as 1. dpH/dt >=0 and t >=2h or when 2. d DO/dt > 1 and t >=2h occur, the output signal A by process controller controls air compressor and the first agitator stops, and aeration finishes.
It is 15 minutes that VI precipitation is set sedimentation time, and precipitate phase completes mud-water separation.
VII draining draining ratio is 1/2, and water displacement is 5L.Flowing water Valve is opened, and supernatant liquor is discharged into intermediate water tank.
Sequencing batch reactor SBR
2alternately under anaerobic-anoxic-oxic environment, moving, each cycle experiences successively anaerobism, water inlet, anoxic, aerobic, precipitation, draining, changes 7 processes of mud.
I anaerobism starts the second agitator, and anaerobically fermenting starts, and fermentation time is set to 9 hours.
In the middle of II water inlet, intake pump starts, and its flooding quantity is 500ml/ minute, and flooding time is 10 minutes.Nitrification liquid in intermediate water tank enters into sequencing batch reactor SBR by middle intake pump
2.
III anoxic denitrification bacterium utilizes tunning to carry out denitrification after water inlet, by NO
x -be reduced into nitrogen, polyP bacteria is with NO simultaneously
x -as electron acceptor(EA), carry out denitrifying phosphorus uptake.When denitrification is carried out, sludge fermentation reaction is also proceeded.According to on-line monitoring pH and ORP, when 1. dpH/dt≤0 and t >=30 minute or when 2. d ORP/dt≤-50 and t >=30 minute occur, close the second agitator, the anoxia stirring period finishes.
The aerobic unlatching intake valve of IV and middle water pump, squeeze into sequencing batch reactor SBR by air
2.Set of time is 30 minutes, controls dissolved oxygen DO0.4-0.5mg/L, so that the condition of synchronous nitration and denitrification to be provided, and the COD that further removes the phosphoric acid salt in mixed solution and do not utilize.
It is 1 hour that V precipitation is set sedimentation time, and precipitate phase completes mud-water separation.
It is 1/2 that draining ratio is set in VI draining, by time switch, controls.Flowing water Valve is opened, and supernatant liquor is discharged through outlet pipeline.
VII is changed mud and is opened the second agitator, after mud mixes from sequencing batch reactor SBR
2discharge mud.Spoil disposal volume is made as sequencing batch reactor SBR
21/20 of useful volume.After spoil disposal finishes, open and add dredge pump, mud enters sequencing batch reactor SBR from mud retention tank
2, it is identical with spoil disposal volume that setting adds mud volume.
Embodiment bis-:
Sequencing batch reactor SBR
1process low C/N than sanitary sewage, each cycle experiences water inlet, anoxic, water inlet, anaerobism, aeration, precipitation, 7 processes of draining successively.
The flooding quantity that I water inlet arranges intake pump is 1L/ minute, intakes 2.5 minutes.After system starts, the sewage in former water tank enters into sequencing batch reactor SBR by intake pump
1, in the time of water inlet, open the first agitator.
After the water inlet of II anoxic, enter the anoxic period, setting the denitrification time is 30 minutes.
The flooding quantity that III water inlet arranges intake pump is 1L/ minute, intakes 2.5 minutes.
IV anaerobism is intake for the second time and is completely entered the anaerobism period, and polyP bacteria utilizes the carbon source in former water to carry out anaerobic phosphorus release effect, and the time is set as 60 minutes.
V aeration is opened air compressor, to sequencing batch reactor SBR
1oxygen is provided, and aeration rate is constant in 40L/ hour, and sewage is fully contacted with active sludge.According to on-line monitoring DO and pH, as 1. dpH/dt >=0 and t >=2h or when 2. d DO/dt > 1 and t >=2h occur, the output signal A by process controller controls air compressor and the first agitator stops, and aeration finishes.
It is 20 minutes that VI precipitation is set sedimentation time, and precipitate phase completes mud-water separation.
VII draining draining ratio is 1/2, and water displacement is 5L.Flowing water Valve is opened, and supernatant liquor is discharged into intermediate water tank.
Sequencing batch reactor SBR
2alternately under anaerobic-anoxic-oxic environment, moving, each cycle experiences successively anaerobism, water inlet, anoxic, aerobic, precipitation, draining, changes 7 processes of mud.
I anaerobism starts the second agitator, and anaerobically fermenting starts, and the VOCs emission in mud is in mixed solution, and polyP bacteria under anaerobic utilizes organism to release phosphorus effect.Set of time is 20 hours.
In the middle of II water inlet, intake pump starts, and its flooding quantity is 1L/ minute, and flooding time is 5 minutes.Nitrification liquid in intermediate water tank enters into sequencing batch reactor SBR by middle intake pump
2.
III anoxic denitrification bacterium and polyP bacteria utilize tunning to carry out denitrification denitrogenation and dephosphorization function after water inlet, by NO
x -be reduced into nitrogen.When denitrification is carried out, sludge fermentation reaction is also proceeded.According to on-line monitoring pH and ORP, when 1. dpH/dt≤0 and t >=30 minute or when 2. d ORP/dt≤-50 and t >=30 minute occur, close the second agitator, the anoxia stirring period finishes.
The aerobic unlatching intake valve of IV and middle water pump, squeeze into sequencing batch reactor SBR by air
2.Set of time is 30 minutes, controls dissolved oxygen DO0.4-0.5mg/L, so that the condition of synchronous nitration and denitrification to be provided, and the COD that further removes the phosphoric acid salt in mixed solution and do not utilize.
It is 2 hours that V precipitation is set sedimentation time, and precipitate phase completes mud-water separation.
VI draining draining ratio is 1/2, and water displacement is 5L.Flowing water Valve is opened, and supernatant liquor is discharged through outlet pipeline.
VII is changed mud and is opened the second agitator, after mud mixes from sequencing batch reactor SBR
2discharge mud.Spoil disposal volume is made as sequencing batch reactor SBR
21/20 of useful volume.After spoil disposal finishes, open and add dredge pump, mud enters sequencing batch reactor SBR from mud retention tank
2, it is identical with spoil disposal volume that setting adds mud volume.
Evidence, take low C/N, C/P be to process object than municipal effluent, and the mixed soil of primary sludge and excess sludge of take is fermentation substrate, and application sludge fermentation strengthening municipal effluent denitrification and dephosphorization method, can obtain good denitrogenation dephosphorizing and mud decrement effect.Water outlet ammonia nitrogen concentration is 0.8 ~ 4.5mg/L, and phosphate concn is 0.4 ~ 0.5mg/L, excess wastewater discharge one-level A standard; Mud decrement rate is 20% ~ 24%, and mud obtains fast and stable.The operating performance of embodiment mono-and embodiment bis-is all within the scope of this.
Claims (1)
1. sludge fermentation is strengthened the method for municipal effluent denitrogenation dephosphorizing, and its device comprises former water tank (1), the sequencing batch reactor SBR connecting in turn
1(3), intermediate water tank (4), sequencing batch reactor SBR
2and mud retention tank (7) (6); Former water tank (1) is by intake pump (2) and sequencing batch reactor SBR
1(3) be connected, sequencing batch reactor SBR
1by pipeline, be connected with intermediate water tank (4), intermediate water tank (4) is by middle water pump (5) and sequencing batch reactor SBR
2(6) be connected; Middle water pump (5) connects admission passage simultaneously; Mud retention tank (7) is by adding dredge pump (8) and sequencing batch reactor SBR
2(6) be connected; Sequencing batch reactor SBR
1(3) aeration head in is connected with air compressor (10); Sequencing batch reactor SBR
1(3) the first agitator (11) and the first temperature-control device (19) are installed; Sequencing batch reactor SBR
2(6) the second agitator (12) and the second temperature-control device (20) are installed in; Sequencing batch reactor SBR
1(3) DO on-line determination instrument (13), a pH on-line determination instrument (14) are installed in; Sequencing batch reactor SBR
2(6) ORP on-line determination instrument (15) and the 2nd pH on-line determination instrument (16) are installed in; The process controller (17) that setting is connected with computer (18) is in addition in order to receive the signal of above-mentioned DO on-line determination instrument (13), a pH on-line determination instrument (14), ORP on-line determination instrument (15), the 2nd pH on-line determination instrument (16), meanwhile, computer (18) is connected with air compressor (10), the first agitator (11) and the second agitator (12) by process controller (17);
It is characterized in that comprising the following steps:
Sequencing batch reactor SBR
1(3) each cycle experiences water inlet, anoxia stirring, water inlet, anaerobism stirring, aeration, precipitation, 7 processes of draining successively;
It is 1/4 of reactor useful volume that flooding quantity is set in I water inlet, by time switch, controls; After system starts, the sewage in former water tank (1) enters into sequencing batch reactor SBR by intake pump (2)
1(3), open the first agitator (11) when water inlet;
After the water inlet of II anoxic, enter the anoxic period, in reactor, after upper cycle draining, remaining nitrification liquid utilizes the carbon source in former water to carry out denitrification, removes total nitrogen; Setting the denitrification time is 30 minutes;
It is 1/4 of reactor useful volume that flooding quantity is for the second time set in III water inlet, by time switch, controls, and the sewage in former water tank (1) enters into sequencing batch reactor SBR by intake pump (2)
1(3);
IV anaerobism anaerobic state, it is used that the carbon source of polyP bacteria utilization in intaking for the second time carried out anaerobic phosphorus release, and the time is set as 30～60 minutes;
V aeration is opened air compressor (10), to sequencing batch reactor SBR
1oxygen is provided, and is oxidation state nitrogen NO by the mineralized nitrogen in water inlet
x -; According to on-line monitoring DO and pH, as 1. dpH/dt>=0 and t>=2h or when 2. d DO/dt > 1 and t>=2h occur, output signal A control air compressor (10) and the first agitator (11) by process controller (17) stop, and aeration finishes;
It is 10-30 minute that VI precipitation is set sedimentation time, and precipitate phase completes mud-water separation;
It is 1/2 that draining ratio is set in VII draining, by time switch, controls; Flowing water Valve is opened, and supernatant liquor is discharged into intermediate water tank (4);
Sequencing batch reactor SBR
2(6) alternately under anaerobic-anoxic-limit oxygen environment, moving, the mixing sludge of primary sludge and excess sludge of take is fermentation substrate, and the ratio of primary sludge/excess sludge dry weight, between 0～2, and does not comprise 0; Sequencing batch reactor SBR
2(6) each cycle experiences successively anaerobism, water inlet, anoxic, aerobic, precipitation, draining, changes 7 processes of mud;
I anaerobism starts the second agitator (12), and anaerobically fermenting starts, and fermentation time is set to 9-20 hour;
It is 1/2 of reactor useful volume that flooding time is set in II water inlet, by time switch, controls; Nitrification liquid in intermediate water tank (4) enters into sequencing batch reactor SBR by middle water pump (5)
2(6);
III anoxic denitrification bacterium utilizes tunning to carry out denitrification after water inlet, by NO
x -be reduced into nitrogen, polyP bacteria is with NO simultaneously
x -as electron acceptor(EA), carry out denitrifying phosphorus uptake; When denitrification is carried out, sludge fermentation reaction is also proceeded; According to on-line monitoring pH and ORP, when 1. dpH/dt≤0 and t>=30 minute or when 2. d ORP/dt≤-50 and t>=30 minute occur, close the second agitator (12), the anoxia stirring period finishes;
The aerobic unlatching intake valve of IV and middle water pump (5), squeeze into sequencing batch reactor SBR by air
2(6); Set of time is 30 minutes, and controlling dissolved oxygen DO is 0.4-0.5mg/L, so that the condition of synchronous nitration and denitrification to be provided, and the COD that further removes the phosphoric acid salt in mixed solution and do not utilize;
It is 1-2 hour that V precipitation is set sedimentation time, and precipitate phase completes mud-water separation;
It is 1/2 that draining ratio is set in VI draining, by time switch, controls; Flowing water Valve is opened, and supernatant liquor is discharged through outlet pipeline (9);
VII is changed mud and is opened the second agitator (12), after mud mixes from sequencing batch reactor SBR
2(6) discharge mud; Spoil disposal volume is made as sequencing batch reactor SBR
2(6) 1/20 of useful volume; After spoil disposal finishes, open and add dredge pump (8), mud enters sequencing batch reactor SBR from mud retention tank (7)
2(6), set that to add mud volume identical with spoil disposal volume.
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| CN103226366B (en) * | 2013-05-09 | 2017-10-03 | 中国科学院生态环境研究中心 | The control method of short distance nitration Anammox integral type denitrification process |
| CN103382051B (en) * | 2013-07-06 | 2014-12-03 | 北京工业大学 | Apparatus and method used for enhancing low-temperature bio-nitrification effects |
| CN103508564A (en) * | 2013-10-15 | 2014-01-15 | 北京工业大学 | Embedded immobilized microorganism deep denitrification reactor and method |
| CN103739163B (en) * | 2013-12-30 | 2015-01-14 | 北京工业大学 | Device and method for improving A2NSBR denitrifying phosphorus removal technology |
| CN103864206B (en) * | 2014-03-21 | 2015-11-18 | 北京工业大学 | The apparatus and method of the Anammox denitrogenation of sludge-digestion liquid half short distance nitration and denitrification dephosphorization coupled system |
| CN103910431B (en) * | 2014-04-03 | 2015-10-14 | 北京工业大学 | Two-stage SBR utilizes sludge internal carbon source to strengthen the apparatus and method of city domestic sewage denitrogenation coupling mud decrement |
| CN105174452B (en) * | 2015-07-19 | 2018-01-19 | 北京工业大学 | A kind of sludge internal carbon source strengthens apparatus and method of the low C/N than city domestic sewage denitrogenation dephosphorizing coupling mud decrement |
| CN105753157B (en) * | 2016-03-26 | 2018-05-25 | 北京工业大学 | The apparatus and method that excess sludge anaerobic fermentation mixture strengthens city domestic sewage advanced nitrogen dephosphorization by two-stage SBR |
| CN108439595B (en) * | 2018-04-04 | 2021-01-05 | 北京工业大学 | Method for realizing partial shortcut nitrification-Anammox/denitrification of sewage by utilizing sludge fermentation product |
| CN109694132B (en) * | 2019-02-23 | 2021-12-17 | 何江涛 | Sewage treatment method of sequencing batch temperature and pressure control biological membrane |
| RU197400U9 (en) * | 2019-09-11 | 2020-08-10 | Общество с ограниченной ответственностью "ГЕФЛИС" | BIOLOGICAL WASTE WATER TREATMENT UNIT |
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