CN201220931Y - Apparatus for realizing sludge shortcut nitrification by using FA and FNA control - Google Patents
Apparatus for realizing sludge shortcut nitrification by using FA and FNA control Download PDFInfo
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- CN201220931Y CN201220931Y CNU2008200797381U CN200820079738U CN201220931Y CN 201220931 Y CN201220931 Y CN 201220931Y CN U2008200797381 U CNU2008200797381 U CN U2008200797381U CN 200820079738 U CN200820079738 U CN 200820079738U CN 201220931 Y CN201220931 Y CN 201220931Y
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- 239000010802 sludge Substances 0.000 title claims description 43
- 238000006396 nitration reaction Methods 0.000 claims abstract description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000007788 liquid Substances 0.000 claims abstract description 34
- 206010021143 Hypoxia Diseases 0.000 claims abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 11
- 230000029087 digestion Effects 0.000 claims description 32
- 206010002660 Anoxia Diseases 0.000 claims description 10
- 241000976983 Anoxia Species 0.000 claims description 10
- 230000007953 anoxia Effects 0.000 claims description 10
- 230000000630 rising effect Effects 0.000 claims description 9
- 238000005273 aeration Methods 0.000 claims description 5
- 238000004064 recycling Methods 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 abstract description 15
- 238000000034 method Methods 0.000 abstract description 15
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 14
- 239000010865 sewage Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005276 aerator Methods 0.000 abstract 1
- 239000013049 sediment Substances 0.000 abstract 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000005516 engineering process Methods 0.000 description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 8
- 210000002249 digestive system Anatomy 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 239000002351 wastewater Substances 0.000 description 6
- 229910021529 ammonia Inorganic materials 0.000 description 4
- 230000001186 cumulative effect Effects 0.000 description 4
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 3
- 230000005764 inhibitory process Effects 0.000 description 3
- 241000894006 Bacteria Species 0.000 description 2
- IOVCWXUNBOPUCH-UHFFFAOYSA-N Nitrous acid Chemical compound ON=O IOVCWXUNBOPUCH-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000011259 mixed solution Substances 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000000452 restraining effect Effects 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 1
- 241001495402 Nitrococcus Species 0.000 description 1
- 241000605122 Nitrosomonas Species 0.000 description 1
- 238000004176 ammonification Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000001651 autotrophic effect Effects 0.000 description 1
- CMLMFNACXHHYRY-UHFFFAOYSA-N azanylidynetin Chemical compound [N].[Sn] CMLMFNACXHHYRY-UHFFFAOYSA-N 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002894 chemical waste Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002503 metabolic effect Effects 0.000 description 1
- 239000010841 municipal wastewater Substances 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model discloses a device and a method for realizing short-cut nitration of sludge-digestion liquid through FA and FNA control. The device comprises a raw water tank, a short-cut nitration reactor, a sediment tank and a water outlet tank; the short-cut nitration reactor is divided into an oxygen-deficiency stirring zone and an aerobic zone, and a DO and Ph value on-line controller is installed in the aerobic zone; and an aerator is arranged at the bottom part of the reactor. The method for realizing the short-cut nitration by adopting the device comprises the following steps: firstly, system start-up; and secondly, adjusting operation during the runtime. The device and the method are applicable to the nitration of the sludge-digestion liquid in a sewage treatment plant; the structure of the device is simple; the process of the method is simple; the operation is easy; a large mount of carbon source is saved; the nitration speed is high; and the effect is good.
Description
Technical field
The utility model relates to a kind of technical field of biological sewage treatment by using, jointly control the device of realizing sludge digestion liquid short distance nitration by free ammonia FA (Free Ammonia) and free nitrous acid FNA (Free Nitrous Acid), be applicable to that sludge from wastewater treatment plant Digestive system and other are such as breeding wastewater, gourmet powder waste water, the contour ammonia nitrogen (NH of coking chemical waste water
4 +-N) organic industrial sewage is handled.
Background technology
The water of China pollutes constantly aggravation, and shortage of water resources has restricted the development of China's economic society, makes the emission standard of municipal wastewater treatment plant improve constantly, and the regeneration of sewage has been trend of the times.The a large amount of excess sludges that produce in the municipal sewage treatment process dispose and reclaim methane usually in digester.But in the anaerobism ammonification of anaerobic digestion process owing to organonitrogen, the nitrogen major part in the mud is with NH
4 +-N form is transferred in the sludge digestion liquid.The NH of Digestive system
4 +-N can reach 1500mg/L, makes sludge digestion liquid become typical high NH
4 +-N hangs down C/N waste water, contained NH
4 +-N accounts for the 15%-25% of Sewage Plant nitrogen load.
Sludge digestion liquid is refluxed existing biochemical processing process and former water is handled together, and carries out denitrogenation (A-O or A by traditional biological denitrification process
2/ O technology), this has increased the nitrogen load of sewage disposal greatly.For the municipal effluent that former water carbon source lacks, the backflow of Digestive system causes denitrogenation dephosphorizing efficient to be difficult to improve, and the part nitrogen of water inlet forms poor circulation in aeration tank and oxidation and the reduction repeatedly of digester quilt.The metabolic characteristics of anaerobic sludge digestion and sludge digestion liquid directly are back to the traditional technology of sink drainage, are that many sewage works nitric efficiency low is main but through commonly overlooked major cause.
The traditional biological denitrogenation is by nitrated with NH
4 +-N is converted into NO
3 --N, again by denitrification with NO
3 --N is converted into nitrogen and overflows from water.At nitrated stage, NH
4 +-N is converted to NO
3 --N is by independently two differential responses finishing of bacterium of two classes, at first by nitrococcus (Nitrosomonas) with NH
4 +-N is converted into NO
2 --N, then by nitrifier (Nitrobaeter) with NO
2 --N is converted into NO
3 --N.For denitrifying bacteria, also can be through NH
4 +-N → NO
2 --N → N
2" simple and direct " approach is like this finished, i.e. short range biological denitrification technology.Short-cut denitrification has following advantage: save 25% oxygen-supplying amount; Save 40% denitrifying carbon source; Reduce the mud growing amount; Shorten the reaction times, the corresponding minimizing 30%～40% of reactor volume.So the short distance nitration denitride technology adapts to the water quality of sludge digestion liquid, can save and build and working cost.High NH
4 +-N sludge digestion liquid stability and high efficiency short range biological denitrification is to realize in the Continuous Flow activated sludge reactor under the recognized problem of bio-denitrifying sewage, particularly normal temperature condition that sludge digestion liquid short range biological denitrification does not appear in the newspapers.
At the present situation of sludge digestion liquid processing and the characteristics of short range biological denitrification, if can in sludge digestion liquid side treatment system, realize high NH
4 +The short distance nitration of-N is then finished denitrification in main flow technology, just can save a large amount of denitrifying carbon sources, and then improves the nitric efficiency of Sewage Plant, reaches energy saving purposes, lays the first stone for sludge digestion liquid whole process autotrophic denitrification simultaneously.As seen, realize and control the device novelty of mud nitrification liquid short distance nitration in the Continuous Flow activated sludge reactor, market application foreground is wide.
Summary of the invention
The purpose of this utility model is in order to solve the problems of the technologies described above, to propose a kind of device by FA and FNA control realization sludge digestion liquid short distance nitration, in the Continuous Flow activated sludge reactor, jointly controlling the high NO of realization sludge digestion liquid by FA and FNA
2 -The short distance biological nitration of-N cumulative percentage (can reach 95%), thus a large amount of denitrifying carbon sources saved.This device has overcome the deficiency of sludge digestion liquid traditional technology, and have technical process simple, adapt to sludge digestion liquid water quality characteristics, flexible operation, characteristics simple to operate.Be applied to reality and can significantly reduce construction and working cost, non-secondary pollution.
The purpose of this utility model is achieved through the following technical solutions:
Device by FA and FNA control realization sludge digestion liquid short distance nitration is characterized in that: be provided with raw water box (1), short distance nitration reactor (2), settling tank (3) and water tank (4); The short distance nitration reactor is equally divided into 9 lattice chambers in the longitudinal direction, lattice chamber the 1st is anoxia stirring district (2.6), be provided with speed governing agitator (2.10) in this district, remaining 8 lattice chamber is aerobic zone (2.9), according to the water (flow) direction aperture that is crisscross arranged up and down is the flowing hole of 15mm, and DO and pH value on-line controller (2.7,2.8) are installed in aerobic zone; Air pump (2.1) is connected with the aeration head that is located at reactor bottom (2.5) by inlet pipe (2.2), gas meter (2.3), air volume regulating valve (2.4); Raw water box is connected with anoxia stirring district (2.6) by intake pump (1.1), water absorption tube (1.2), pressure pipe (1.3); The short distance nitration reactor connects the pipe core (3.4) of settling tank by rising pipe (2.11), below pipe core, be provided with taper reflector (3.6), settling tank is provided with sample cock (3.5) from top to bottom, and settling tank is connected with the anoxia stirring district (2.6) of short distance nitration reactor by sludge reflux pump (3.1), mud valve (3.2), effluent recycling pipeline (3.3); The rising pipe of settling tank (3.7) connects water tank, and raw water box and water tank are provided with blow-off valve (1.4,4.1) respectively, and water tank also is provided with rising pipe (4.3) and overflow pipe (4.2).
Know-why: sludge digestion liquid is typical high NH
4 +-N, low C/N waste water.The basicity of sludge digestion liquid only is NH
4 +4～6 times of-N, complete nitrated basicity deficiency, the pH value excessively reduces when nitrated.For high NH
4 +The sludge digestion liquid denitrogenation of-N, low C/N ratio is if can realize high NO
2 --N cumulative percentage short distance nitration utilizes carbon source limited in the sludge digestion liquid to carry out the part denitrification simultaneously, can save a large amount of denitrifying carbon sources.
The short distance nitration of nitrification liquid is mostly finished in the reactor of intermittent operation at present, and realizes short distance nitration because operational administrative simply and more is of practical significance in the reactor of Continuous Flow.Short distance nitration is realized in the environment of low dissolved axygen usually, and the short distance nitration of this research is to realize under the envrionment conditions of high-solubility oxygen, has higher NH
4 +-N rate of nitrification.
NH in the waste water
4 +-N is different because of the pH value, and the ammonia of molecular state and ionic state exists with different ratios.FA has the obvious suppression effect to nitrification, and NOB belongs to the inhibition that is more vulnerable to FA than AOB, and the FA of 0.1～1.0mg/L will suppress the activity of Nitrosomas.Have only when FA reaches 10～100mg/L and just can exert an influence the AOB activity.NO in the while waste water
2 --N is different because of the pH value, and the nitrite of molecular state and ionic state exists with different ratios, and along with the continuous reduction of pH value, the ratio of FNA improves constantly.FNA has the obvious suppression effect to NOB, and NOB is more vulnerable to the inhibition of FNA than AOB, and the FNA of 0.02mg/L will suppress the activity of NOB.Have only when FNA reaches 0.40mg/L and just can exert an influence the AOB activity.
Because the nitrated of high ammonia nitrogen finished gradually, and pH value constantly reduces, and then also gradually reduction of the concentration of free ammonia FA, but need only FA concentration＞0.1mg/L will be kept the restraining effect of FA to NOB at the leading portion of short distance nitration reactor.At the back segment of reactor, because NH
4 +-N concentration and pH value significantly reduce, and cause FA to level off to 0mg/L, and then lose the restraining effect to NOB.But this moment is because most ammonia-nitrogen is converted into NO
2 --N makes to be subjected to the inhibition of FNA like this at the rear end of reactor NOB by FNA concentration＞0.01mg/L.FA and FNA by reactor leading portion and back segment higher concentration realized stable short distance nitration to the selective inhibitory of NOB so respectively.
The concise and to the point process of described sludge digestion liquid short distance nitration is: sludge digestion liquid and settling tank returned sluge in 30%～150% ratio, are pumped into the anoxia stirring district of short distance nitration reactor respectively, make the NO in the returned sluge
2 --N and NO
3 --N utilizes the organic carbon source in the former water to carry out the part denitrification; The muddy water mixed solution of oxygen-starved area enters into aerobic zone, finishes high NH
4 +The short distance nitration of-N.At aerobic zone NH
4 +-N is oxidized to NO
2 --N and minor N O
3 --N realizes high NO
2 -The short distance nitration of-N cumulative percentage.Mixed solution in the short distance nitration reactor flow into settling tank and carries out mud-water separation, and mud flows to the oxygen-starved area of short distance nitration reactor by the sludge stream blowback, and supernatant liquor flow into water tank overflow water outlet.
The utility model relates to pass through FA and FNA jointly control realize sludge digestion liquid short distance nitration device compared with prior art, have following advantage:
1) traditional method that directly is back to main flow area with sludge digestion liquid relatively, in this technology, sludge digestion liquid is realized NH
4 +The short distance nitration of-N, and utilize the limited carbon source in the Digestive system to finish certain denitrification.Enter into main flow area through after the pre-treatment, can save a large amount of organic carbon sources, improving the municipal effluent denitrogenation dephosphorizing efficient of low C/N ratio, improving effluent quality;
2) primary sludge Digestive system and recycling effluent at first utilize the organic carbon source in the former water to carry out denitrification denitrogenation in the oxygen-starved area, reclaim basicity simultaneously and improve oxygen-starved area pH value;
3) with sludge digestion liquid nitration processes such as SHARON relatively, this technology needn't control reaction temperature and sludge age, thereby has very high biomass, improved reactor the volumetric loading rate, reduce the pond and hold, and then saved construction and working cost;
4) realize NH by short distance nitration
4 +The efficient short distance nitration of-N is not only saved 25% aeration rate, and saves 40% the required carbon source of denitrification, and this denitrogenation to the sludge digestion liquid that carbon source lacks is most important;
5) utilize the water quality characteristics of Digestive system, in nitrifying process by basicity and NH
4 +The proportionlity of-N realizes and keeps stable short distance nitration by FA and FNA associating biological control;
6) recycling effluent not only can be finished denitrification, reclaims basicity when realizing denitrogenation, improves the pH of system value, and can dilute the high NH of water inlet
4 +-N concentration only suppresses FA concentration, but does not suppress AOB to NOB, thereby forms short distance nitration.Keep short distance nitration by the impact load prevention of FA because of the adaptability of NOB simultaneously;
7) short distance nitration is realized in the environment of low dissolved axygen usually, and realize under the envrionment conditions of the tangible high-solubility oxygen of short distance nitration of this research, have higher NH
4 +-N rate of nitrification.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described: embodiment: the device by FA and FNA control realization sludge digestion liquid short distance nitration is provided with raw water box 1, short distance nitration reactor 2, settling tank 3 and water tank 4; The short distance nitration reactor is equally divided into 9 lattice chambers in the longitudinal direction, lattice chamber the 1st is anoxia stirring district 2.6, be provided with speed governing agitator 2.10 in this district, remaining 8 lattice chamber is an aerobic zone 2.9, according to the water (flow) direction aperture that is crisscross arranged up and down is the flowing hole of 15mm, and DO and pH value on-line controller 2.7,2.8 are installed in aerobic zone; Air pump 2.1 is connected by inlet pipe 2.2, gas meter 2.3, air volume regulating valve 2.4 and the aeration head 2.5 that is located at reactor bottom; Raw water box is connected with anoxia stirring district 2.6 by intake pump 1.1, water absorption tube 1.2, pressure pipe 1.3; The short distance nitration reactor connects the pipe core 3.4 of settling tank by rising pipe 2.11, below pipe core, be provided with taper reflector 3.6, settling tank is provided with sample cock 3.5 from top to bottom, and settling tank is connected with the anoxia stirring district 2.6 of short distance nitration reactor by sludge reflux pump 3.1, mud valve 3.2, effluent recycling pipeline 3.3; The rising pipe 3.7 of settling tank connects water tank, and raw water box and water tank are provided with blow-off valve 1.4,4.1 respectively, and water tank also is provided with rising pipe 4.3 and overflow pipe 4.2.
Long run test result shows: short distance nitration reactor water outlet COD＜100mg/L, NO
x -The maximum material removal rate of-N is 20%～40%, is nitrated recovery part basicity simultaneously.The COD concentration that short distance nitration reactor II water outlet is lower, wherein about 50% COD is difficult to biochemistry, and this is high NH
4 +-N is in the nitrated favourable condition of having created of short distance nitration reactor.The NH of primary sludge Digestive system
4 +-N concentration is 250～400mg/l, the maximum NH of short distance nitration reactor
4 +It is 0.50Kg NH that-N removes speed
4 +-N/m
3D, at 14～30 ℃, NH
4 +The clearance of-N about 60%～80%, NO
2 --N cumulative percentage is 75%～85%.Because the deficiency of former water organic carbon source makes system's inorganic nitrogen TIN clearance 20%～50%.
Claims (1)
1, a kind of device by FA and FNA control realization sludge digestion liquid short distance nitration is characterized in that: be provided with raw water box (1), short distance nitration reactor (2), settling tank (3) and water tank (4); The short distance nitration reactor is equally divided into 9 lattice chambers in the longitudinal direction, lattice chamber the 1st is anoxia stirring district (2.6), be provided with speed governing agitator (2.10) in this district, remaining 8 lattice chamber is aerobic zone (2.9), according to the water (flow) direction aperture that is crisscross arranged up and down is the flowing hole of 15mm, and DO and pH value on-line controller (2.7,2.8) are installed in aerobic zone; Air pump (2.1) is connected with the aeration head that is located at reactor bottom (2.5) by inlet pipe (2.2), gas meter (2.3), air volume regulating valve (2.4); Raw water box is connected with anoxia stirring district (2.6) by intake pump (1.1), water absorption tube (1.2), pressure pipe (1.3); The short distance nitration reactor connects the pipe core (3.4) of settling tank by rising pipe (2.11), below pipe core, be provided with taper reflector (3.6), settling tank is provided with sample cock (3.5) from top to bottom, and settling tank is connected with the anoxia stirring district (2.6) of short distance nitration reactor by sludge reflux pump (3.1), mud valve (3.2), effluent recycling pipeline (3.3); The rising pipe of settling tank (3.7) connects water tank, and raw water box and water tank are provided with blow-off valve (1.4,4.1) respectively, and water tank also is provided with rising pipe (4.3) and overflow pipe (4.2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200797381U CN201220931Y (en) | 2008-04-02 | 2008-04-02 | Apparatus for realizing sludge shortcut nitrification by using FA and FNA control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200797381U CN201220931Y (en) | 2008-04-02 | 2008-04-02 | Apparatus for realizing sludge shortcut nitrification by using FA and FNA control |
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| Publication Number | Publication Date |
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| CN201220931Y true CN201220931Y (en) | 2009-04-15 |
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ID=40574444
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101284697B (en) * | 2008-04-02 | 2010-06-02 | 北京城市排水集团有限责任公司 | Device and method for realizing shortcut nitrification of sludge-digestion liquid by combined control of FA and FNA |
| CN104528933A (en) * | 2014-11-29 | 2015-04-22 | 北京工业大学 | Method for realizing continuous-flow city sewage autotrophic nitrogen removal based on FNA treatment of sludge |
| CN108726677A (en) * | 2017-04-25 | 2018-11-02 | 湖南大学 | A kind of new process promoting low-carbon-source wastewater treatment |
| CN117756268A (en) * | 2023-12-28 | 2024-03-26 | 上海大学 | A method to reduce the dosage of PN reaction by using intelligent control |
-
2008
- 2008-04-02 CN CNU2008200797381U patent/CN201220931Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101284697B (en) * | 2008-04-02 | 2010-06-02 | 北京城市排水集团有限责任公司 | Device and method for realizing shortcut nitrification of sludge-digestion liquid by combined control of FA and FNA |
| CN104528933A (en) * | 2014-11-29 | 2015-04-22 | 北京工业大学 | Method for realizing continuous-flow city sewage autotrophic nitrogen removal based on FNA treatment of sludge |
| CN104528933B (en) * | 2014-11-29 | 2016-09-14 | 北京工业大学 | The method that mud realizes flowing municipal sewage autotrophic denitrification continuously is processed based on FNA |
| CN108726677A (en) * | 2017-04-25 | 2018-11-02 | 湖南大学 | A kind of new process promoting low-carbon-source wastewater treatment |
| CN117756268A (en) * | 2023-12-28 | 2024-03-26 | 上海大学 | A method to reduce the dosage of PN reaction by using intelligent control |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20090415 Effective date of abandoning: 20080402 |