CN201136824Y - Denitrification phosphorus removal device through anaerobic- anoxic oxidation channel process - Google Patents
Denitrification phosphorus removal device through anaerobic- anoxic oxidation channel process Download PDFInfo
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- CN201136824Y CN201136824Y CNU2007201873763U CN200720187376U CN201136824Y CN 201136824 Y CN201136824 Y CN 201136824Y CN U2007201873763 U CNU2007201873763 U CN U2007201873763U CN 200720187376 U CN200720187376 U CN 200720187376U CN 201136824 Y CN201136824 Y CN 201136824Y
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- Prior art keywords
- denitrification
- phosphorus removal
- bacteria
- oxidation ditch
- phosphorus
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- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 66
- 230000003647 oxidation Effects 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 36
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title abstract description 31
- 229910052698 phosphorus Inorganic materials 0.000 title abstract description 31
- 239000011574 phosphorus Substances 0.000 title abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 238000005273 aeration Methods 0.000 claims description 41
- 241000894006 Bacteria Species 0.000 abstract description 39
- 239000010802 sludge Substances 0.000 abstract description 35
- 239000010865 sewage Substances 0.000 abstract description 14
- 230000000694 effects Effects 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 244000005700 microbiome Species 0.000 abstract description 2
- 230000002860 competitive effect Effects 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 24
- 229910052799 carbon Inorganic materials 0.000 description 24
- 239000001205 polyphosphate Substances 0.000 description 16
- 235000011176 polyphosphates Nutrition 0.000 description 16
- 229920000388 Polyphosphate Polymers 0.000 description 13
- 229920000037 Polyproline Polymers 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 10
- 238000007599 discharging Methods 0.000 description 7
- 238000006396 nitration reaction Methods 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229920013639 polyalphaolefin Polymers 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000005276 aerator Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 3
- 238000010992 reflux Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000006228 supernatant Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical class OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000009294 enhanced biological phosphorus removal Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 2
- 238000010561 standard procedure Methods 0.000 description 2
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Abstract
The utility model relates to a denitrification phosphorus removal device of an anaerobic-anoxic oxidation ditch process, which belongs to the sewage treatment technical filed. Aiming at the problem that the biological phosphorus removal effect of the oxidation ditch process is relatively worse, the traditional oxidation ditch is improved so as to enhance the phosphorus removal capacity. On the basis of the traditional oxidation ditch processing device, an aerobic tank, an anoxic tank A and an anaerobic tank B are added, and a novel oxidation ditch process with denitrification phosphorus removal capacity is developed. The characteristics of phosphorus-accumulating bacteria, denitrification bacteria and denitrification phosphorus removal bacteria and the difference among the phosphorus-accumulating bacteria, the denitrification bacteria and the denitrification phosphorus removal bacteria are fully utilized to ensure that three types of microorganisms occupy different ecology niches in three selectors of a system, thereby realizing respective functions. The denitrification phosphorus removal device decelerates the contradiction between the phosphorus-accumulating bacteria and the denitrification bacteria through reasonably distributing return sludge and water, to ensure that the advantage of the nitrification phosphorus removal bacteria during the competitive process is enhanced, and therefore, the effects of denitrification and phosphorus removal is reached. The denitrification phosphorus removal device has the advantages that the phosphorus removal is high, the operation is relatively stable, and the sludge is not easy to bulk.
Description
Technical field
A kind of anaerobic-anoxic oxidation pitch technique denitrification dephosphorization device of the utility model, what relate to is the technical field of sanitary sewage biological carbon and phosphorous removal.
Background technology
Oxidation Ditch Technology
Oxidation ditch (oxidation ditch) has another name called continuous circulated aeration tank (Continuous loop reactor), is a kind of distortion of activated sludge process.Oxidation ditch is applied to Holland at first, has become a kind of important sewage disposal technology at present.In recent years, adopt the speed of oxidation ditch treatment plant that breakthrough has been arranged.At present the growth in sewage work's quantity of China's oxidation ditch process is rapider.Stable, the convenient operating maintenance of oxidation ditch process, effluent quality is good.Improved in recent years oxidation ditch process has preferably, and the denitrogenation dephosphorizing ability makes this technology become one of the most practical technology both at home and abroad.Oxidation ditch process is the first-selected technology of present domestic and international newly-built sewage work.
Oxidation ditch has special hydromechanics fluidised form, and the characteristics of existing complete mixing reactor have the characteristics of plug flow reactor again, have macroscopic dissolved oxygen concentration gradient in the ditch, also have the dissolved oxygen gradient of microcosmic in addition in the active sludge flco.The oxidation ditch section is a rectangle or trapezoidal, and it is oval that planeform mostly is.The depth of water is generally 3～5m in the ditch at present, precipitates in ditch for preventing active sludge, and average flow velocity is greater than 0.3m/s in the oxidation ditch.Oxidation ditch aeration and mixing has surface aeration machine, aeration rotary brush or rotating disk, jet aerator, catheter type aerator and promotes tubular type aerator etc., and what be used in recent years also has pusher under water.
Oxidation ditch process is at first considered biological denitrificaion usually, so this technology is less about the biological phosphate-eliminating research of oxidation ditch process so that biological denitrificaion is celebrated efficiently.Because the oxidation ditch process hydraulic detention time is longer, sludge age is also longer, generally believes the biological phosphate-eliminating ability of this two aspects restriction oxidation ditch process.In order to improve the biological phosphate-eliminating ability of oxidation ditch process, set up anaerobic pond and anoxic pond at traditional oxidation ditch process front end, oxidation ditch process is improved to A
2/ O oxidation ditch process.
The biological phosphate-eliminating technology
Biological phosphate-eliminating (EBPR) is a kind of economy and sustainability phosphorus removing method, produces a large amount of reluctant chemical sludges because avoided adding chemical agent and becomes the focus of Recent study.EBPR mainly moves in the environment of anaerobic and aerobic alternate run by polyP bacteria (PAOs), PAOs absorbs organic carbon source under anaerobic state, mainly be VFA (VFA), come synthetic poly-beta-hydroxy alkanoic acid (PHA) and it is stored in the body, the energy that consumes mainly comes from and decomposes intravital poly-phosphate, simultaneously orthophosphoric acid salt is discharged outside the microbe.At aerobic stage subsequently, PAOs utilizes the PHA of savings as carbon source and energy growth and breeding, absorbs the orthophosphoric acid salt in the water, with the intravital poly-phosphate level of the form recovery of stomge of poly-phosphate.Biological phosphate-eliminating is exactly that the rich phosphorated mud of aerobic stage is discharged as excess sludge, reaches the purpose of biological phosphate-eliminating.
The denitrification dephosphorization technology
Under anoxic condition, also can carry out the absorption of phosphorus.In recent years, studies show that some microorganisms that are referred to as denitrification phosphorus-collecting bacterium (DPAOs) can be with NO
3 -Or NO
2 -As the intravital PHA of final electron acceptor(EA) oxidation, provide the energy that absorbs phosphorus.Utilize NO
3 -And NO
2 -Absorb phosphorus reaction as electron acceptor(EA) and be known as denitrification dephosphorization (DPR).PHA has played important role in as denitrifying carbon source, denitrification dephosphorization makes system reduce the demand of carbon source.
Denitrification dephosphorization is because thereby PAO utilizes internal carbon source to carry out anti-nitration reaction and has following two advantages: 1. save carbon source, because denitrification process needs the carbon source of easily degrading in the former water usually, the denitrification dephosphorization process can also be applied to as denitrifying carbon source carbon source after PAO releases the utilization of phosphorus process, carbon source has used twice, has improved the utilising efficiency of carbon source.2. the intravital carbon source of PAO at denitrification process by NO
3 -Oxidation has been equivalent to reduce the oxygen requirement of aerobic processes, thereby has energy-saving advantages.
The utility model content
The purpose of this utility model provides a kind of anaerobic-anoxic oxidation pitch technique denitrification dephosphorization device and method, with solution oxidation ditch process biological denitrificaion and the lower problem of dephosphorization efficiency by using when the water inlet carbon-nitrogen ratio is low, thus the stability and the high-level efficiency of promotion biological carbon and phosphorous removal.
A kind of anaerobic-anoxic oxidation pitch technique denitrification dephosphorization device that the utility model provides, comprise water tank 1, comprise the oxidation ditch main body of aeration tank 8, with second pond 16, it is characterized in that, set up three selector switchs in described oxidation ditch body front end: anaerobic pond 4, anoxic pond A5 and anoxic pond B6.
Use the method for described anaerobic-anoxic oxidation pitch technique denitrification dephosphorization device, may further comprise the steps:
1) active sludge that contains polyP bacteria, denitrifying bacteria and nitrifier is added in oxidation ditch main body and the second pond 16, sanitary sewage is added in the water tank 1, start intake pump A2 and intake pump B3, open return sludge pump A18 and return sludge pump B19 simultaneously, by continuous processing sanitary sewage make active sludge in oxidation ditch system through 1～2 month domestication and cultivation; Make the activated sludge concentration in the oxidation ditch maintain 3000mg/L～4500mg/L;
2) 70%～80% raw waste water and 25%～50% returned sluge mix the small amount of N O in the returned sluge through agitator 7 in anaerobic pond 4
3 -Removed by the heterotrophic bacterium denitrification fast, polyP bacteria absorbs VFA subsequently, and carries out the release of phosphorus; At anaerobic pond 4 mean residence times is 40～60 minutes;
3) after the muddy water of discharging in the above-mentioned anaerobic pond 4 enters anoxic pond A5,50%～75% returned sluge that pumps into sludge reflux pump B19 mixes, the polyP bacteria of releasing behind the phosphorus partly has the denitrification dephosphorization function, be called the denitrification phosphorus-collecting bacterium, this quasi-microorganism utilizes the NO that brings in the returned sluge in anoxic pond A5
3 -Carry out denitrification as electron acceptor(EA) and absorb phosphorus; Mean residence time is 60～80 minutes in anoxic pond A5;
4) muddy water of discharging among the above-mentioned anoxic pond A5 enters behind the anoxic pond B6 and intake pump 3 pumps into that 20%～30% former water mixes, and heterotrophic bacterium utilizes easy degraded carbon source in the former water with unreacted NO among the anoxic pond A5
3 -Be reduced to N
2Mean residence time is 20～40 minutes in anoxic pond B6;
5) after the muddy water of above-mentioned anoxic pond B6 discharge enters in the oxidation ditch aeration pond 8, blast aeration is carried out in 12 pairs of water inlets of gas blower, aerating system is made up of gas blower 12, spinner-type flowmeter 13 blast mains 14 and aeration head 15, the size of aeration rate is adjusted according to running status Inlet and outlet water situation utilization spinner-type flowmeter 13, control water outlet NH
4 +At 1～4mg/L, if water outlet NH
4 +Exceed this scope, will adjust, water outlet NH aeration rate
4 +During＞4mg/L, increase aeration rate, water outlet NH
4 +During＜1mg/L, reduce aeration rate; Treating water in oxidation ditch aeration pond 8 average hydraulic detention time 14-20 hour after overflow weir 9 gravity flows enter in the second pond 16, in oxidation ditch water outlet place DO instrument 10 and pH meter 11 are set, control dissolved oxygen at 1.0～2.0mg/L according to the online registration of DO instrument, pH is usually between 7.0～8.0;
Carry out following four kinds of reactions in oxidation ditch aeration pond 8: oxidation of coal reaction, nitrifier nitration reaction, the polyP bacteria that heterotrophic bacteria utilizes organism to carry out comprises the absorption phosphorus reaction of denitrification phosphorus-collecting bacterium;
6) treating water that overflows from oxidation ditch aeration pond 8 enters second pond 16 and carries out mud-water separation, and the supernatant liquor overflow is through rising pipe 17 discharge systems, and returned sluge is back to anaerobic pond 4 and anoxic pond A5 respectively through return sludge pump A18 and return sludge pump B19 respectively;
7) excess sludge is controlled sludge age by residual sludge pump 20 discharge systems by discharging excess sludge, and sludge age is controlled at 10～15d.
The beneficial effect of utility model
The utility model relates to comparing with traditional oxidation ditch process and has following advantage:
1, realized stable biological phosphate-eliminating on the biological denitrificaion basis, the clearance of TP can reach more than 80%;
2, former water and returned sluge are optimized distribution according to the principle of biological denitrificaion and biological phosphate-eliminating, make carbon source in most of former water preferentially satisfy the demand of biological phosphate-eliminating, make polyP bacteria fully discharge phosphorus, utilize the internal carbon source of polyP bacteria to carry out denitrification then, reach the dual-purpose effect of a carbon, relaxed biological denitrificaion and biological phosphate-eliminating contradiction the carbon source competition.The denitrification dephosphorization process has also been saved the aeration energy consumption in the oxidation ditch aeration pond subsequently simultaneously;
3, the water inlet in the anoxic pond 6 act as: avoid in the water carbon source excessive, excessive carbon source enters in the anoxic pond 5 to make anaerobic pond, influences denitrifying phosphorus uptake thereby traditional anti-nitration reaction takes place; For the denitrification that carries out in the anoxic pond 6 provides carbon source;
4, the anti-nitration reaction that carries out among anoxic pond A5 and the anoxic pond B6 has reclaimed basicity, has promoted the pH value, has avoided because the not enough nitration reaction of carrying out in the aeration tank that influences of basicity;
5, preposition anaerobic pond 4, anoxic pond A5 and anoxic pond B6 have played the function of biological selector, have suppressed hyphomycetic growth, thereby have reduced the probability that Filamentous Bulking takes place to a certain extent.
Description of drawings
Fig. 1 anaerobic-anoxic oxidation pitch technique denitrification dephosphorization device synoptic diagram
Wherein 1-water tank, 2-intake pump A, 3-intake pump B, 4-anaerobic pond, 5-anoxic pond A, 6-anoxic pond B, 7-agitator, 8-aeration tank, 9-overflow weir, 10-DO instrument, 11-pH meter, 12-gas blower, 13-spinner-type flowmeter, 14-blast main, 15-aeration head, 16-second pond, 17-rising pipe, 18-return sludge pump A, 19-return sludge pump B, the 20-residual sludge pump.
Embodiment
Below in conjunction with drawings and Examples the utility model is elaborated:
Specific embodiment one
Seed sludge is from the returned sluge of Beijing winebibber's bridge sewage work, and test water is taken from Beijing winebibber's bridge sewage work aerated grit chamber.The main water-quality guideline of experimental stage is: COD is 232～621mg/L, NH
4 +Be 42.1～64.5mg/L, PO
4 3-Be 5.2～9.1mg/L, TP is 5.9～9.7mg/L, and TN is that 56.4～73.5mg/LpH is 7.2～7.8.The standard method that the analytical procedure that is adopted in the test is all issued according to State Bueau of Environmental Protection.
Testing sequence is for to add seed sludge in the aeration tank 8 to, sanitary sewage is added in the water tank 1, start intake pump A2 and intake pump B3,70～80% raw waste water and 25～50% returned sluge mix the small amount of N O in the returned sluge through agitator 7 in anaerobic pond 4
3 -Removed by the heterotrophic bacterium denitrification fast, polyP bacteria absorbs VFA, and carries out the release of phosphorus.At anaerobic pond 4 mean residence times is 40～60 minutes.After the muddy water of discharging in the anaerobic pond 4 enters anoxic pond A5,50～75% returned sluges that pump into sludge reflux pump B19 mix, the polyP bacteria of releasing behind the phosphorus partly has the denitrification dephosphorization function, is called the denitrification phosphorus-collecting bacterium, and this quasi-microorganism utilizes the NO that brings in the returned sluge in anoxic pond 5
3 -Carry out denitrification as electron acceptor(EA) and absorb phosphorus.Mean residence time is 60～80 minutes in anoxic pond 5; The muddy water of discharging among the anoxic pond 5A enters behind the anoxic pond 6B and intake pump B3 pumps into 20～30% former water and mixes, and heterotrophic bacterium utilizes easy degraded carbon source in the former water with unreacted NO among the anoxic pond A5
3 -Be reduced to N
2Mean residence time is 20～40 minutes in anoxic pond B6.After the muddy water that anoxic pond B6 discharges entered in the oxidation ditch aeration pond 8, gas blower 12 carried out blast aeration for the aeration head 15 that is arranged in aeration tank 8 provides oxygen to treating water, and the size of aeration rate is adjusted according to running status Inlet and outlet water situation, control water outlet NH
4 +At 1～4mg/L, if water outlet NH
4 +Exceed this scope, will adjust, water outlet NH aeration rate
4 +During＞4mg/L, increase aeration rate, water outlet NH
4 +During＜1mg/L, reduce aeration rate.Treating water in oxidation ditch aeration pond 8 average after hydraulic detention time 14-20 hour draining enter in the second pond 16.Carry out following four kinds of reactions in oxidation ditch aeration pond 8: oxidation of coal reaction, nitrifier nitration reaction, the polyP bacteria that heterotrophic bacteria utilizes organism to carry out comprises the absorption phosphorus reaction of denitrification phosphorus-collecting bacterium.The treating water that overflows from oxidation ditch aeration pond 8 enters second pond 16 and carries out mud-water separation, and supernatant liquor is discharged system, and returned sluge is back to anaerobic pond A5 and anoxic pond B6 respectively.
Carry out according to above implementation step, active sludge in oxidation ditch system through after 3 months domestication and cultivating, COD, NH in the water outlet
4 +, TP and TN concentration be respectively 35.7～60.5mg/L, 0～6.4mg/L, 0.11～2.41mg/L and 13.7～25.4mg/L, mean value is respectively 45.8mg/L, 3.4mg/L, 0.58mg/L and 16.5mg/L, COD, NH
4 +, TP and TN average removal rate be respectively 89.7,93.4%, 92.1% and 74.6%.
Specific embodiment two
Seed sludge is from the returned sluge of Beijing winebibber's bridge sewage work, and test water is taken from Beijing University of Technology's family members pond municipal pipeline sanitary sewage.Main water-quality guideline is: COD is 201～532mg/L, NH
4 +Be 47.5/61.9mg/L, PO
4 3-Be 3.4/8.6mg/L, TN is 52.4/68.3mg/L, and pH is 7.2/7.8.The standard method that the analytical procedure that is adopted in the test is all issued according to State Bueau of Environmental Protection.
Testing sequence is for to add seed sludge in the aeration tank 8 to, sanitary sewage is added in the water tank 1, start intake pump A2 and intake pump B3, the water inlet ratio of intake pump A2 and B3 is 4: 1, open return sludge pump A18 and B19 simultaneously, the throughput ratio of return sludge pump A18 and B19 is 1: 3, by continuous processing sanitary sewage make active sludge in oxidation ditch system through 2 months domestication and cultivation, make the activated sludge concentration in the oxidation ditch system maintain 3000mg/L～4500mg/L.80% raw waste water and 25% returned sluge mix through agitator in anaerobic pond 4, the small amount of N O in the returned sluge
3 -Removed by the heterotrophic bacterium denitrification fast, polyP bacteria absorbs VFA subsequently, and carries out the release of phosphorus.At the anaerobic pond mean residence time is 40～60 minutes.After the muddy water of discharging in the anaerobic pond 4 enters anoxic pond A5,75% returned sluge that pumps into sludge reflux pump B19 mixes, the polyP bacteria of releasing behind the phosphorus partly has the denitrification dephosphorization function, is called the denitrification phosphorus-collecting bacterium, and this quasi-microorganism utilizes the NO that brings in the returned sluge in anoxic pond A5
3 -Carry out denitrification as electron acceptor(EA) and absorb phosphorus.Mean residence time is 60～80 minutes in anoxic pond A5; The muddy water of discharging among the anoxic pond 5A enters behind the anoxic pond 6B and intake pump B3 pumps into, and 20% former water mixes, and heterotrophic bacterium utilizes easy degraded carbon source in the former water with unreacted NO among the anoxic pond A5
3 -Be reduced to N
2Mean residence time is 20～40 minutes in anoxic pond B6.After the muddy water that anoxic pond B6 discharges entered in the oxidation ditch aeration pond 8, gas blower 12 carried out blast aeration for the aeration head 15 that is arranged in aeration tank 8 provides oxygen to treating water.Treating water in oxidation ditch aeration pond 8 average after hydraulic detention time 14-20 hour draining enter in the second pond 16.Carry out following four kinds of reactions in oxidation ditch aeration pond 8: oxidation of coal reaction, nitrifier nitration reaction, the polyP bacteria that heterotrophic bacteria utilizes organism to carry out comprises the absorption phosphorus reaction of denitrification phosphorus-collecting bacterium.The treating water that overflows from oxidation ditch aeration pond 8 enters second pond 16 and carries out mud-water separation, and supernatant liquor is discharged system, and returned sluge is back to anaerobic pond A5 and anoxic pond B6 respectively.
Carry out according to above implementation step, active sludge in oxidation ditch system through after 2 months domestication and cultivating, COD, NH in the water outlet
4 +, PO
4 3-Be respectively 40.2mg/L with the mean concns of TN, 2.4mg/L, 0.41mg/L and 15.4mg/L, COD, NH
4 +, PO
4 3-Be respectively 86.4,95.6%, 92.7% and 73.5% with the average removal rate of TN.
Claims (1)
1, a kind of anaerobic-anoxic oxidation pitch technique denitrification dephosphorization device, comprise water tank (1), comprise the oxidation ditch main body of aeration tank (8), and second pond (16), it is characterized in that, set up three selector switchs: anaerobic pond (4), anoxic pond A (5) and anoxic pond B (6) in described oxidation ditch body front end.
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| CNU2007201873763U CN201136824Y (en) | 2007-12-21 | 2007-12-21 | Denitrification phosphorus removal device through anaerobic- anoxic oxidation channel process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201873763U CN201136824Y (en) | 2007-12-21 | 2007-12-21 | Denitrification phosphorus removal device through anaerobic- anoxic oxidation channel process |
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| Publication Number | Publication Date |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106255669A (en) * | 2014-05-02 | 2016-12-21 | 贝克休斯公司 | The nitrogen-containing compound of bacterial control in water-based fluid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106255669A (en) * | 2014-05-02 | 2016-12-21 | 贝克休斯公司 | The nitrogen-containing compound of bacterial control in water-based fluid |
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