CN102603120B - Device and method for treating sewage with low ratio of carbon to nitrogen - Google Patents
Device and method for treating sewage with low ratio of carbon to nitrogen Download PDFInfo
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- CN102603120B CN102603120B CN201210066443.1A CN201210066443A CN102603120B CN 102603120 B CN102603120 B CN 102603120B CN 201210066443 A CN201210066443 A CN 201210066443A CN 102603120 B CN102603120 B CN 102603120B
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- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000010865 sewage Substances 0.000 title claims abstract description 39
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title abstract description 36
- 229910052757 nitrogen Inorganic materials 0.000 title abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title abstract description 16
- 229910052799 carbon Inorganic materials 0.000 title abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000003957 anion exchange resin Substances 0.000 claims abstract description 23
- 238000001914 filtration Methods 0.000 claims abstract description 15
- 238000004659 sterilization and disinfection Methods 0.000 claims abstract description 9
- 238000005342 ion exchange Methods 0.000 claims abstract description 4
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 claims description 37
- 238000005325 percolation Methods 0.000 claims description 27
- 239000000701 coagulant Substances 0.000 claims description 16
- 238000010992 reflux Methods 0.000 claims description 14
- 239000000706 filtrate Substances 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000006004 Quartz sand Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- 238000005189 flocculation Methods 0.000 claims description 4
- 230000016615 flocculation Effects 0.000 claims description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 3
- 238000005273 aeration Methods 0.000 claims description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical group [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 230000001954 sterilising effect Effects 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 13
- 230000000249 desinfective effect Effects 0.000 abstract 1
- 230000007547 defect Effects 0.000 description 4
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 description 3
- 238000005345 coagulation Methods 0.000 description 3
- 230000015271 coagulation Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- VSCWAEJMTAWNJL-UHFFFAOYSA-K aluminium trichloride Chemical compound Cl[Al](Cl)Cl VSCWAEJMTAWNJL-UHFFFAOYSA-K 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 240000004859 Gamochaeta purpurea Species 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 150000003016 phosphoric acids Chemical class 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
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Abstract
The invention discloses a device and method for treating sewage with a low ratio of carbon to nitrogen. The device is formed by sequentially connecting a biochemical treatment unit, a magnetic anion exchange resin treatment unit, a contact filtering unit and a disinfecting unit by pipelines in series. According to the method for treating the sewage with the low ratio of the carbon to the nitrogen, the sewage with the low ratio of the carbon to the nitrogen is highly treated through steps of biochemical treatment, ion exchange, contact filtering, disinfection, discharge and the like. The device and the method for treating the sewage with the low ratio of the carbon to the nitrogen, disclosed by the invention, not only is low in technical cost and good in total nitrogen removing effect, but also remarkably strengthen an effect for removing organic matters and suspended matters so as to fully meet the requirement on water quality.
Description
Technical field
The present invention relates to a kind of device and method of sewage disposal, especially process the device and method of low carbon-nitrogen ratio sewage.
Background technology
A lot of for the process form of sewage denitrification and dephosphorization both at home and abroad, mainly contain A/A/O, UCT, VIP, Bardenpho, SBR and oxidation ditch etc., and its most basic principle is classical denitrogenation dephosphorizing theory.According to this theory, available carbon source content in raw waste water is depended in the removal of nitrogen, phosphorus to a great extent.Yet at present southern area and the larger municipal effluent of trade effluent proportion at home, its carbon-nitrogen ratio is lower (be generally less than 5, even can lower than 3) conventionally, is difficult to meet the demand of denitrogenation dephosphorizing process to carbon source.
The mode that in production, normal employing adds Additional carbon sources is improved the removal effect of nitrogen phosphorus, but this has increased the expense that carbon source adds on the one hand, and the carbon source adding is in addition converted into the burden that excess sludge has increased sludge treatment.In addition, by this mode, can improve to a certain extent the removal effect of nitrogen phosphorus, but its effluent quality is difficult to assurance, when water temperature is relatively low especially in the winter time, because biological activity is relatively low, causes the removal effect of nitrogen still can be subject to certain restrictions.Therefore, the two stage biological of being everlasting is set up coagulation, precipitation and filtration process after processing and is ensured effluent quality, and economic target is high undoubtedly, and technique is undesirable to the removal effect of total nitrogen, is difficult to meet the whole requirement of denitrogenation.
Summary of the invention
Technical problem to be solved: in order to overcome the defect that prior art cost is high, total nitrogen removal effect is undesirable, the invention provides the device and method of processing low carbon-nitrogen ratio sewage.
Technical scheme: for solving the problems of the technologies described above, the invention provides the device of processing low carbon-nitrogen ratio sewage, it is characterized in that: by biochemical treatment unit, magnetic anion exchange resin processing unit, contact percolation unit, disinfection unit is connected successively by pipeline, described biochemical treatment unit is by anaerobic pond, anoxic pond, Aerobic Pond, second pond is connected by pipeline, the setting of Aerobic Pond end is back to the internal reflux pipeline of anoxic pond, second pond setting is back to the external reflux pipeline of anaerobic pond, the outlet of second pond is the outlet of biochemical processing unit, described magnetic anion exchange resin processing unit comprises magnetic anion exchange resin.
As the present invention, process a kind of improvement of the device of low carbon-nitrogen ratio sewage, also comprise a lift pump, described lift pump is connected with second pond outlet.
The another kind of processing the device of low carbon-nitrogen ratio sewage as the present invention improves, and also comprises a coagulant dosage device, and described coagulant dosage device is connected with contact percolation device water-in.
For solving the problems of the technologies described above, the present invention also provides the method for processing low carbon-nitrogen ratio sewage, comprises the following steps:
(1) biochemical treatment: low carbon-nitrogen ratio sewage flows into biochemical treatment unit, enters intermediate conduit through anaerobic pond, anoxic pond, Aerobic Pond, second pond after processing; Part of contaminated water through internal reflux by Aerobic Pond to anoxic pond, through external reflux by second pond to anaerobic pond;
(2) ion-exchange: enter magnetic anion exchange resin processing unit after the water pressurization of intermediate conduit, flow to the water-in of contact percolation unit by the water outlet of magnetic anion exchange resin processing unit;
(3) contact percolation: the water-in dosing coagulant in contact percolation unit, enters contact percolation unit and carry out contact flocculation, filtration after mixing;
(4) sterilization discharge: the sterile-processed rear discharge of water outlet of contact percolation unit.
As the present invention, process a kind of improvement of the method for low carbon-nitrogen ratio sewage, the carbon-nitrogen ratio of described low carbon-nitrogen ratio sewage is below 4.
The another kind of processing the method for low carbon-nitrogen ratio sewage as the present invention improves, and the abundant aeration of described Aerobic Pond, more than in Aerobic Pond, dissolved oxygen content maintains 3mg/L.
The another kind of processing the method for low carbon-nitrogen ratio sewage as the present invention improves, internal reflux ratio is controlled at 100%～180%, external reflux ratio is controlled at 15%～60%, and the hydraulic detention time of anaerobic pond, anoxic pond, Aerobic Pond is made as respectively 0.5～1h, 1.0～3.5,6～10h.
The another kind of processing the method for low carbon-nitrogen ratio sewage as the present invention improves, described magnetic anion exchange resin processing unit adopts upward flow continuously-running duty, processing water multiple is in 800 times, process water in the magnetic anion exchange resin processing unit residence time below 3min.
The another kind of processing the method for low carbon-nitrogen ratio sewage as the present invention improves, and described coagulating agent is Tai-Ace S 150 or iron(ic) chloride, and coagulating agent usage quantity is in 50mg/L.
The another kind of processing the method for low carbon-nitrogen ratio sewage as the present invention improves, described contact percolation unit adopts upward flow filtration mode, filtrate is quartz sand filter media, particle diameter is grating filtrate, effective size of grain (d10) is 1.8mm, nonuniformity coefficient (K80) is 1.3, and filtrate thickness is more than 1.6m, and the filtering velocity of contact percolation unit is 10-20m/h.
Beneficial effect:
The invention discloses a kind of method of processing low carbon-nitrogen ratio sewage, for carbon source relative deficiency in low carbon-nitrogen ratio sewage, be difficult to meet denitrogenation dephosphorizing demand more completely, improve the main operating parameter of biochemical treatment unit, utilize the basic usefulness of magnetic anion exchange resin, and optimize the operating parameter of follow-up advanced treatment unit, formation is for the treatment process of low carbon-nitrogen ratio sewage, and the method has overcome the defect that prior art cost is high, total nitrogen removal effect is undesirable.
The present invention improves the main operating parameter of biochemical treatment unit according to the content of carbon source in raw waste water, wherein Aerobic Pond is by increasing aeration rate, the proper extension residence time, to reach the degradable of biodegradable organic.Processing by biochemical treatment unit can partly be removed the nitrogen in water, phosphorus, biodegradable organic is removed as far as possible, and be nitric nitrogen by mineralized nitrogen, biochemical treatment unit, without adding Additional carbon sources, effectively reduces the cost that prior art is processed low carbon-nitrogen ratio sewage.
Magnetic anion exchange resin processing unit is for the water outlet of biochemical unit, utilize magnetic anion exchange resin to remove nitric nitrogen, remaining organism remaining in the water outlet of biochemical unit, magnetic anion exchange resin processing unit is combined with biochemical treatment unit, efficiently solves the undesirable defect of total nitrogen removal effect.In addition, magnetic anion exchange resin processing efficiency is high, reusable, has therefore reduced the cost of prior art processing low carbon-nitrogen ratio sewage.
In addition the coagulation of contact percolation unit by using,, contact percolation technique are removed the particulate matter such as phosphoric acid salt, organism and suspended substance, colloid; Disinfection unit discharges after the disinfection of effluent of contact filtering unit is processed.
The device of the method for processing low carbon-nitrogen ratio sewage provided by the invention and application the method, has solved existing need and has additionally added carbon source, the defect that technical costs is high, total nitrogen removal effect is undesirable.Present method adopts method biological and that materilization freatment method combines, has good complementarity and flexibility of operation, can regulate operating parameter according to water quality situation, guarantees to reach water quality requirement comprehensively.By the enforcement of present method, not only can guarantee the removal effect of nitrogen phosphorus, also have significantly strengthening organism, suspended substance removal effect, realize and process stable water outlet, reach water quality requirement comprehensively.
Accompanying drawing explanation
Fig. 1 is for processing the device schematic diagram of low ratio of carbon to ammonium effluent sewage; 1 is that biochemical processing unit, 2 is that anaerobic pond, 3 is that anoxic pond, 4 is that Aerobic Pond, 5 is that second pond, 6 is that lift pump, 7 is that magnetic anion exchange resin processing unit, 8 is that coagulant dosage device, 9 is that contact percolation unit, 10 is disinfection unit;
Fig. 2 is for processing the flow process of low carbon-nitrogen ratio sewage.
Embodiment
Embodiment 1
Process the device of low carbon-nitrogen ratio sewage, its structural representation as shown in Figure 1, by biochemical treatment unit 1, lift pump 6, magnetic anion exchange resin processing unit 7, contact percolation unit 9, disinfection unit 10 is connected successively by pipeline, described biochemical treatment unit is by anaerobic pond 2, anoxic pond 3, Aerobic Pond 4, second pond 5 is connected by pipeline, the setting of Aerobic Pond end is back to the internal reflux pipeline of anoxic pond, second pond setting is back to the external reflux pipeline of anaerobic pond, the outlet of second pond is the outlet of biochemical processing unit, described magnetic anion exchange resin processing unit 7 comprises magnetic anion exchange resin.Also comprise a coagulant dosage device 8, contact percolation device water-in connects.
The processing of three batches of low carbon-nitrogen ratio sewages:
(1) biochemical treatment: low carbon-nitrogen ratio sewage flows into biochemical treatment unit, enters intermediate conduit through anaerobic pond, anoxic pond, Aerobic Pond, second pond after processing; Because carbon source content is relatively low, the operating parameter of biochemical treatment unit adopts lower inside and outside reflux ratio, be respectively 100%～180%, 15%～60%, and the hydraulic detention time of anaerobic pond, anoxic pond, Aerobic Pond is made as respectively 0.5～1h, 1.0～3.5,6～10h;
(2) ion-exchange: the water of intermediate conduit enters magnetic anion exchange resin processing unit after pressurizeing by lift pump, this unit adopts upward flow continuously-running duty, make to process water and keep fluidized state in this unit, the rate of expansion of processing water is controlled at 150% left and right; Water outlet by magnetic anion exchange resin processing unit flows to the water-in of contact percolation unit by gravity; In this water side, unit, resin device for trapping is set, resin is retained in this unit completely; For reaching certain nitric nitrogen removal effect, its water flowing multiple is controlled in 800 times, and hydraulic detention time is set in below 3min.
(3) contact percolation: contact percolation device water-in is established coagulant dosage device, by coagulant dosage device dosing coagulant, after mixing, entering quartz sand filtering layer carries out contact flocculation, filters described contact percolation unit employing upward flow filtration mode, filtrate is quartz sand graduation filtrate, effective size of grain (d10) is 1.8mm, nonuniformity coefficient (K80) is 1.3, and filtrate thickness is more than 1.6m.Coagulating agent is selected inorganic coagulant, and as Tai-Ace S 150 or iron(ic) chloride, dosage is controlled at 30～50mg/L, and the filtering velocity of contact percolation is selected 10～20m/h.
(4) sterilization discharge: the sterile-processed rear discharge of water outlet of contact percolation unit.
Table 1 is the treating processes operating parameter of these three batches of low carbon-nitrogen ratio sewages.
The treating processes operating parameter of three batches of low carbon-nitrogen ratio sewages of table 1
Conventional A
2o technique+coagulation-precipitation-filtration process is processed low carbon-nitrogen ratio sewage:
(1) biochemical treatment: low carbon-nitrogen ratio sewage flows into biochemical treatment unit, enters intermediate conduit through anaerobic pond, anoxic pond, Aerobic Pond, second pond after processing; The operating parameter of biochemical treatment unit is respectively: inside and outside reflux ratio respectively 300%, 100%, and the hydraulic detention time of anaerobic pond, anoxic pond, Aerobic Pond is made as respectively 1.5h, 3.0,5.0h; ;
(2) coagulation-precipitation-filter depth is processed: the water of intermediate conduit enters coagulation unit through promoting.Coagulating agent adopts polymerize aluminum chloride, and dosage is 60mg/L, adopts line mixer to mix; Flocculation basin adopts folded plate flocculator, residence time 15min; Precipitation adopts tube settler, hydraulic detention time 1.0h; Filter and adopt quartz sand graduation filtrate, effective size of grain (d10) is 1.0mm, and nonuniformity coefficient (K80) is 1.4, and thickness of filter bed adopts 1.0m, and filtering velocity adopts 8m/h.
The mensuration of water-quality guideline
Gather the water outlet after 3 pairs of low carbon-nitrogen ratio sewages of embodiment 2 and embodiment are processed, measure water-quality guideline.
Measuring method: opacity adopts turbidimeter (Hash 2100N) to measure, and the < < water that all the other index determinings are all recommended with reference to national environmental protection portion and the related assays method of the effluent monitoring method > > third edition are measured.
The settling pit water outlet of table 1 Taihu Lake basin urban wastewater treatment firm and the water-quality guideline after this art breading
The described treatment process for low carbon-nitrogen ratio sewage is during steady running, very good to the pollutant removal in sewage, meet < < urban wastewater treatment firm pollutant emission standard > > (GB18918-2002) one-level A requirement.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
1. process the method for low carbon-nitrogen ratio sewage, it is characterized in that: comprise the following steps:
(1) biochemical treatment: low carbon-nitrogen ratio sewage flows into biochemical treatment unit, enters intermediate conduit through anaerobic pond, anoxic pond, Aerobic Pond, second pond after processing; Part of contaminated water through internal reflux by Aerobic Pond to anoxic pond, through external reflux by second pond to anaerobic pond;
(2) ion-exchange: enter magnetic anion exchange resin processing unit after the water pressurization of intermediate conduit, flow to the water-in of contact percolation unit by the water outlet of magnetic anion exchange resin processing unit;
(3) contact percolation: the water-in dosing coagulant in contact percolation unit, enters contact percolation unit and carry out contact flocculation, filtration after mixing;
(4) sterilization discharge: the sterile-processed rear discharge of water outlet of contact percolation unit; The carbon-nitrogen ratio of described low carbon-nitrogen ratio sewage is below 4; The abundant aeration of Aerobic Pond, more than in Aerobic Pond, dissolved oxygen content maintains 3mg/L; Internal reflux ratio is controlled at 100%～180%, and external reflux ratio is controlled at 15%～60%, and the hydraulic detention time of anaerobic pond, anoxic pond, Aerobic Pond is made as respectively 0.5～1h, 1.0～3.5,6～10h; Described magnetic anion exchange resin processing unit adopts upward flow continuously-running duty, and processing water multiple is in 800 times, process water in the magnetic anion exchange resin processing unit residence time below 3min; Coagulating agent is Tai-Ace S 150 or iron(ic) chloride, and coagulating agent usage quantity is in 50mg/L; Contact percolation unit is upward flow filtration mode, and filtrate is quartz sand filter media, and particle diameter is grating filtrate, and effective size of grain d10 is 1.8mm, and non-homogeneous coefficient K80 is 1.3, and filtrate thickness is more than 1.6m, and the filtering velocity of contact percolation unit is 10-20m/h.
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| CN104250050A (en) * | 2013-06-26 | 2014-12-31 | 李相昆 | Application of A/MBBR/A to nitrogen and phosphorus removal of municipal sewage with low carbon-nitrogen ratio |
| CN103771645B (en) * | 2014-01-24 | 2016-04-06 | 太平洋水处理工程有限公司 | A kind of efficiency compact high coupled water treatment unit and treatment process thereof |
| CN105366857A (en) * | 2015-12-10 | 2016-03-02 | 青海荷洁纳米材料科技有限公司 | Photovoltaic and mains supply complementary five water treatment modes integrated household purifier |
| CN106892543A (en) * | 2017-04-28 | 2017-06-27 | 南京环保产业创新中心有限公司 | The method that depth removes Coal Gas Washing Cycling Water nitrate nitrogen |
| CN108217947A (en) * | 2018-02-14 | 2018-06-29 | 温志军 | A kind of batch-type control method of sewage disposal AO and AAO techniques |
| CN109205968A (en) * | 2018-11-23 | 2019-01-15 | 韩晓宇 | A kind of sewage water denitrification carbon source adds technique |
| CN109354335A (en) * | 2018-12-14 | 2019-02-19 | 谢绍舜 | The optimum organization technique of town domestic sewage processing |
| CN113943758B (en) * | 2020-07-16 | 2024-01-16 | 中粮生物科技股份有限公司 | Method for producing ethanol |
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| CN101423265A (en) * | 2008-12-03 | 2009-05-06 | 北京师范大学 | Ion-exchange denitrification and phosphorus removal advanced treatment method |
| CN101423314A (en) * | 2008-12-03 | 2009-05-06 | 北京师范大学 | High efficiency denitrification, phosphorus removal and phosphorus resource recovery composite for urban sewage |
| CN201756490U (en) * | 2010-07-30 | 2011-03-09 | 同济大学 | Continuous-flow sewage low-oxygen short-range denitrification treatment device |
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| JPS5347156A (en) * | 1976-10-13 | 1978-04-27 | Hitachi Ltd | Method of removing nitrogen from waste water |
| CN101905931A (en) * | 2010-02-11 | 2010-12-08 | 南京大学 | Advanced treating method of biochemical tail water based on magnetic resin |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101423265A (en) * | 2008-12-03 | 2009-05-06 | 北京师范大学 | Ion-exchange denitrification and phosphorus removal advanced treatment method |
| CN101423314A (en) * | 2008-12-03 | 2009-05-06 | 北京师范大学 | High efficiency denitrification, phosphorus removal and phosphorus resource recovery composite for urban sewage |
| CN201756490U (en) * | 2010-07-30 | 2011-03-09 | 同济大学 | Continuous-flow sewage low-oxygen short-range denitrification treatment device |
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