CN114906937A - Low-energy-consumption full-automatic denitrification process - Google Patents

Low-energy-consumption full-automatic denitrification process Download PDF

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CN114906937A
CN114906937A CN202210588375.9A CN202210588375A CN114906937A CN 114906937 A CN114906937 A CN 114906937A CN 202210588375 A CN202210588375 A CN 202210588375A CN 114906937 A CN114906937 A CN 114906937A
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sludge
reactor
water
denitrification
low
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秦玉洁
林心悦
唐玥娴
贺雪婷
梁皓稀
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South China University of Technology SCUT
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
    • C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/302—Nitrification and denitrification treatment
    • C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
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Abstract

The invention discloses a low-energy-consumption full-automatic denitrification process, wherein mixed sludge of river and lake bottom sludge, nitrified sludge and anaerobic ammonium oxidation sludge is adopted as inoculation sludge in the process, the mixing volume ratio is 1:1: 1-1: 2:4, the inoculation amount is 20-35% of the volume of a device, and water is fed with NH in wastewater 4 + N is a nitrogen source. And water is fed into the bottom of the reactor, the gas generated by the reaction is discharged from the exhaust hole at the top of the reactor in a continuous water feeding mode, and the discharged water flows out from the overflow weir at the upper part of the reactor. The pH value of the inlet water is adjusted to 7.5-7.8, the hydraulic retention time HRT is 16-24 h, and the operation is carried out at the normal temperature (10 ℃ -30 ℃). After the device runs for 10 days, the photosynthesis-shortcut nitrification-anaerobic ammonia oxidation composite process constructed by microalgae-bacteria co-culture is used for denitrification, so that the denitrification effect is as high as 85%.

Description

Low-energy-consumption full-automatic denitrification process
Technical Field
The invention belongs to the technical field of water treatment, and particularly relates to a low-energy-consumption full-automatic denitrification process.
Background
In the traditional nitrification-denitrification process, ammonia nitrogen is oxidized into nitrite and nitrate by nitrifying bacteria under aerobic conditions; under the anoxic condition, the nitrate nitrogen is reduced into nitrogen gas by denitrification by using organic matters as electron donors, thereby achieving the purpose of removing nitrogen from sewage. The denitrification process is a key step of the traditional biological denitrification, and an adequate organic carbon source is required to ensure the denitrification effect. Wherein, the nitrification needs mechanical aeration for oxygen supply, the denitrification is a heterotrophic process, chemical reagents such as methanol and the like are required to be added for providing a carbon source, and the investment and the operation cost are higher.
The discovery of anammox bacteria allows the autotrophic denitrification technology to be put into practical treatment. The anammox bacteria oxidize ammonia nitrogen by using nitrite as an electron acceptor, use inorganic carbon as a carbon source and do not need organic matters as the carbon source, thereby realizing the aim of autotrophic nitrogen removal.
In the shortcut nitrification anaerobic ammonia oxidation autotrophic nitrogen removal process, part of ammonia nitrogen in sewage is oxidized into nitrite nitrogen, so that 60% of aeration amount can be saved, organic matters are not needed to be used as carbon sources, and 100% of organic carbon sources can be saved. (Verstraete W, De Caveye P V, Diamantis V.Maximum use of resources present in domistic "used water" [ J ]]Bioresource Technology,2009,100(23):5537- 2 O, or very little production of N 2 O, therefore, the short-cut nitrification anaerobic ammonia oxidation technology is considered to be a sustainable sewage treatment technology, and the sewage treatment is expected to realize self-sufficiency of energy or generate energy.
The shortcut nitrification-anaerobic ammonia oxidation technology (PNA) is a novel denitrification technology widely applied to the field of biological denitrification in recent years. The Kongyu and the like utilize an SBR reactor to treat ammonia nitrogen wastewater, each operation period comprises 4 working procedures, namely water inlet, aeration, sedimentation and water drainage. Firstly, ammonia nitrogen is oxidized into nitrite and nitrate through short-cut nitrification, then under the anaerobic condition, the ammonia nitrogen is used as an electron donor, and the nitrate or nitrite is used as an electron acceptor, so that the ammonia is oxidized into nitrogen (Kongxiayu, Changjiang, Mengchunlin, Zhang Lianmna, Zhang)Pilot study of autotrophic nitrogen removal by one-step method of ammoxidation [ J]Chinese water supply and drainage, 2014,30(19):1-5+ 10.). The PNA process, however, has the significant disadvantage of requiring mechanical aeration to supply oxygen for the short-cut nitration reaction to complete the NH 4 + To NO 2 - The conversion and mechanical aeration energy consumption are high, and the current sustainable development is still not facilitated.
Many researches show that the microalgae have strong capability of removing nutrient substances such as nitrogen, phosphorus and the like in sewage, and meanwhile, the microalgae can strengthen the single-stage autotrophic denitrification process and remove inorganic substances in the sewage. Research shows that chlorella is compared with other microalgae, and except scenedesmus, the chlorella is algae with high nitrogen and phosphorus removal rate. (Quchuanbo, Shixian. Chlorella is heterotrophic to culture by using beer waste water [ J ]. Microbiol. 2009,49(06):780-785.) however, if inoculating single algae in the actual treatment, it is often necessary to culture separately, and there is a certain obstacle in engineering. Meanwhile, an ecosystem in a single algae system is fragile, algae easily die due to changes of natural environment and influences of climate, and the ecological system is not beneficial to sewage treatment and operation and maintenance of a reactor.
Disclosure of Invention
The invention aims to provide a full-automatic denitrification process with low energy consumption, and particularly aims at high NH (NH) through the action of a phycomycete co-culture system 4 + N waste water, provides a photosynthetic-shortcut nitrification-anaerobic ammonia oxidation process, and realizes completely autotrophic nitrogen removal with low energy consumption.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a low-energy-consumption full-automatic denitrification process, which is a method for algae oxygen production combined with short-range nitrification-anaerobic ammonia oxidation synergistic denitrification, wherein mixed sludge of river and lake bottom sludge, nitrified sludge and anaerobic ammonia oxidation sludge is adopted as inoculation sludge, oxygen generated by algae in the river and lake bottom sludge is used as an oxygen supply source, an inorganic carbon source is provided for a system, the mixing volume ratio is 1:1: 1-1: 2:4, the inoculation amount is 20-35% of the volume of a device, and water inflow is performed by using NH in wastewater 4 + N is a nitrogen source.
Furthermore, the main components of the bottom mud of the rivers and the lakes are silt, algae in the rivers and the lakes and ammonia oxidizing bacteria.
Further, the algae is mainly composed of chlorophyta and diatoms.
Further, the nitrifying sludge contains ammonia oxidizing bacteria and nitrifying bacteria as main components.
Furthermore, the main component of the anammox sludge is anammox bacteria.
Furthermore, the mixing volume ratio of the river and lake bottom sludge, the nitrifying sludge and the anaerobic ammonium oxidation sludge is 1:1: 1.
Further, the inoculation amount of the mixed sludge of the bottom sludge of the river and the lake, the nitrified sludge and the anaerobic ammonium oxidation sludge is 1/3 of the volume of the device.
Furthermore, the water inlet adopts a mode of water inlet at the bottom of the reactor and continuous water inlet, gas generated by reaction is discharged from the vent hole at the top of the reactor, and effluent flows out from an overflow weir at the upper part of the reactor.
Further, the pH value of the influent water is adjusted to 7.5-7.8.
Furthermore, the hydraulic retention time HRT in the reactor is 16-24 h.
Further, the hydraulic retention time HRT in the reactor was 24 h.
Further, the reactor is operated at normal temperature (10 ℃ to 30 ℃).
Further, the pH of the feed water is adjusted with hydrochloric acid or alkali.
Further, feed water NH 4 + -the N concentration is: 40-150 mg/L.
The invention provides a full autotrophic biological denitrification technology with low energy consumption and even zero energy consumption. Compared with the traditional anaerobic ammonia oxidation process, the photosynthesis of the microalgae provides oxygen for the short-cut nitrification-anaerobic ammonia oxidation process, mechanical aeration oxygen supply is not needed, short-cut nitrification is realized by utilizing a bacterial-algae symbiotic system, and the whole-process autotrophic nitrogen removal is realized by coupling the anaerobic ammonia oxidation process, so that the demand of the process on energy and resources is greatly reduced. Meanwhile, specific algae do not need to be inoculated in the invention, and the algae in different rivers and lakes are taken as natural algae sources, so that the body is enrichedThe community in the system reduces the cultivation cost and the limit of the region to the algae. The invention utilizes the photosynthesis of microalgae to produce oxygen for ammonia oxidizing bacteria to oxidize NH 4 + Oxidation of-N to NO 2 - N, anammox bacteria with unreacted NH 4 + -N with newly generated NO 2 - N is a reaction substrate, and N is generated by reaction 2 The reaction formula is as follows:
6CO 2 +12H 2 O→C 6 H 12 O+6H 2 0+O 2 (photosynthesis)
NH 4 + +1.5O 2 →NO 2 - +H 2 O+2H + (shortcut nitrification)
NH 4 + +1.32NO 2 - +0.066HCO 3 - +0.13H + →1.02N 2 +0.26NO 3 - +0.066CH 2 O 0.5 N 0.15 +2.03H 2 O (anammox)
NH in anaerobic ammonia oxidation couple reaction 4 + -N and NO 2 - The requirement of the proportion of-N is very strict, and the exact proportion is difficult to ensure in practical application, so that the removal efficiency of the total nitrogen in practical application is low. In addition, an appropriate amount of sodium nitrite is added to the feed water so that the substrate NO for the second-step anammox reaction is 2 - N is sufficient, and the reaction is ensured to be carried out smoothly. By NH 4 + -N as electron donor, NO 2 - -N as an electron acceptor, reacting to form N 2 And the denitrification efficiency of the reactor is improved.
Compared with the prior art, the invention has the following beneficial effects:
(1) the algae supplies oxygen, and compared with mechanical aeration, the distribution of the oxygen in the water is more uniform. And the disturbance of mechanical aeration to water is reduced, the loss of activated sludge caused by the action of water flow is avoided, and the method is more favorable for the growth of activated sludge and the treatment of sewage.
(2) The algae in the invention is naturally enriched algae in the reaction system, mainly comprises algae of Chlorophyta and Diatom, can adsorb certain toxic and harmful substances, such as heavy metals and the like, and can provide better reaction conditions for anaerobic ammonia oxidation.
(3) The ecological system in the device is composed of microorganisms such as algae, nitrobacteria and anaerobic ammonium oxidation bacteria, the biological diversity is higher, the ecological system is more complex, and the effluent quality is more stable.
(4) Aiming at inorganic wastewater or wastewater with low C/N ratio, organic matters are not required to be added as electron acceptors for supplement, and the treatment cost is reduced.
(5) The invention does not need mechanical aeration, saves energy consumption and cost, is convenient to operate and has good economic, environmental and social benefits.
(6) When the system runs stably, the method has good removal effect on high-concentration ammonia nitrogen, the ammonia nitrogen removal efficiency can reach more than 90%, and the total nitrogen removal efficiency can reach 85%.
Drawings
FIG. 1 is a schematic diagram of an experimental apparatus combining bacteria and algae with shortcut nitrification-anammox, which is adopted in the embodiment of the present invention.
FIG. 2 is a comparison chart of ammonia nitrogen inlet and outlet water concentrations obtained in examples 1-5 of the present invention.
FIG. 3 is a graph showing the ammonia nitrogen removal rates obtained in examples 1 to 5 of the present invention.
FIG. 4 is a graph comparing the total nitrogen removal rates obtained in examples 1-5 of the present invention.
Detailed Description
The present invention is further described below in conjunction with the appended drawings, but the scope of the invention as claimed is not limited to the scope described in the detailed description. It is noted that the processes described below, if not specifically described in detail, are all realizable or understandable by those skilled in the art with reference to the prior art. The reagents or apparatus used are not indicated to the manufacturer, and are considered to be conventional products available by commercial purchase.
The experimental device adopted by the invention is shown in figure 1, the reactor is a UBF anaerobic ammonium oxidation reactor, is made of organic glass and is cylindrical, the main body part of the reactor sequentially comprises a sludge area 3, a sampling port 4, a packing layer 5 and a three-phase separator 6 from bottom to top, the bottom of the reactor is sequentially connected with a peristaltic pump 2, a water inlet tank 1 and water is fed into the reactor through the peristaltic pump 2, and the three-phase separator 6 is provided with a sampling port 7.
The reactor has a total volume of 8L, a diameter of 12cm and a total height of 70cm, and sponge filler is added to the upper part of a sludge zone 3, namely a zone 5, in the reactor for preventing sludge loss and facilitating the attachment and growth of algae (mainly comprising Chlorophyta and Diatomia). Algae (mainly composed of chlorophyta and diatoms) can also attach to and grow on nitrifying bacteria and anammox bacteria in the sludge zone 3, and the reactor is operated under exposure conditions. And continuously pumping wastewater from the bottom of the reactor through a peristaltic pump, fully mixing and reacting with sludge, discharging generated gas from an exhaust hole at the top of the reactor, discharging effluent from an overflow weir at the upper part of the reactor to a water tank 8, controlling the pH of the influent water to be 7.5-7.8, controlling the hydraulic retention time HRT to be 16-24 h, and operating at 10-30 ℃.
Example 1
A low-energy-consumption full-automatic denitrifying process and apparatus features that the water fed to reactor is used to simulate the alkaline etching of PCB to wash waste water and regulate NH 4 + The concentration of-N is 40-150 mg/L.
Taking mixed sludge of 0.53L of river and lake bottom sludge, 0.53L of nitrifying sludge and 0.53L of anaerobic ammonium oxidation sludge as inoculation sludge, wherein the mixing volume ratio is 1:1:1, the inoculation amount is 20 percent of the volume of the device, namely 1.6L, the hydraulic retention time HRT is 16h, and NH in wastewater is taken as influent water 4 + N is a nitrogen source. Adjusting the pH of the inlet water to 7.5-7.8 by using hydrochloric acid or sodium hydroxide. The reactor runs under the exposure condition, the reactor runs for 10d and is stable, the reactor is considered to be started successfully, and the denitrification effect is verified.
Example 2
A low-energy-consumption full-automatic denitrifying process and apparatus features that the water fed to reactor is used to simulate the alkaline etching of PCB to wash waste water and regulate NH 4 + The concentration of N is 40-150 mg/L.
On the basis of the first embodiment, the inoculation sludge amount and the hydraulic retention time HRT are increased, and 0.72L of river and lake bottom sludge and 0.72L of nitrification are adoptedThe mixed sludge of the sludge and 0.72L of anaerobic ammonium oxidation sludge is inoculated sludge, the mixing volume ratio is 1:1:1, the inoculation amount is 27 percent of the volume of the device, namely 2.16L, the hydraulic retention time HRT is 20h, and NH in wastewater is used as influent water 4 + N is a nitrogen source. Adjusting the pH of the inlet water to 7.5-7.8 by using hydrochloric acid or sodium hydroxide. The reactor continues to operate under the exposure condition, the reactor operates stably for 4d, and the denitrification effect is verified.
Example 3
A low-energy-consumption full-automatic denitrifying process and apparatus features that the water fed to reactor is used to simulate the alkaline etching of PCB to wash waste water and regulate NH 4 + The concentration of-N is 40-150 mg/L.
Increasing the amount of inoculated sludge and increasing the hydraulic retention time HRT on the basis of the second embodiment, adopting mixed sludge of 0.93L of river and lake bottom sludge, 0.93L of nitrified sludge and 0.93L of anaerobic ammonium oxidation sludge as inoculated sludge, wherein the mixing volume ratio is 1:1:1, the inoculum size is 35 percent of the volume of the device, namely 2.8L, the hydraulic retention time HRT is 24h, and NH in wastewater is taken as influent water 4 + N is a nitrogen source. Adjusting the pH of the inlet water to 7.5-7.8 by using hydrochloric acid or sodium hydroxide. The reactor continues to operate under the exposure condition, the reactor operates stably for 4d, and the denitrification effect is verified.
Example 4
A low-energy-consumption full-automatic denitrifying process and apparatus features that the water fed to reactor is used to simulate the alkaline etching of PCB to wash waste water and regulate NH 4 + The concentration of-N is 40-150 mg/L.
On the basis of the third embodiment, the inoculation sludge amount is reduced, the mixing volume ratio is changed, and the hydraulic retention time HRT is reduced, wherein the mixed sludge of 0.43L of river and lake bottom sludge, 0.86L of nitrified sludge and 0.86L of anaerobic ammonium oxidation sludge is adopted as the inoculation sludge, the mixing volume ratio is 1:2:2, the inoculation amount is 27 percent of the volume of the device, namely 2.16L, the hydraulic retention time HRT is 22h, and NH in wastewater is taken as influent water 4 + N is a nitrogen source. Adjusting the pH of the inlet water to 7.5-7.8 by using hydrochloric acid or sodium hydroxide. The reactor continues to operate under the exposure condition, the reactor operates for 6d to be stable, and the denitrification effect is started to be carried outAnd (5) comparing and verifying.
Example 5
A low-energy-consumption full-automatic denitrifying process and apparatus features that the water fed to reactor is used to simulate the alkaline etching of PCB to wash waste water and regulate NH 4 + The concentration of-N is 40-150 mg/L.
Increasing the amount of inoculated sludge, changing the mixing volume ratio and increasing the hydraulic retention time HRT on the basis of the fourth embodiment, adopting the mixed sludge of 0.4L of river and lake bottom sludge, 0.8L of nitrified sludge and 1.6L of anaerobic ammonium oxidation sludge as the inoculated sludge, wherein the mixing volume ratio is 1:2:4, the inoculation amount is 35 percent of the volume of the device, namely 2.8L, the hydraulic retention time HRT is 24h, and NH in wastewater is taken as influent 4 + N is a nitrogen source. The pH of the inlet water is adjusted to 7.5-7.8 by hydrochloric acid or sodium hydroxide. The reactor continues to operate under the exposure condition, the reactor operates stably for 5d, and the denitrification effect is verified.
Comparative example 1
A low-energy-consumption full-automatic denitrifying process and apparatus features that the water fed to reactor is used to simulate the alkaline etching of PCB to wash waste water and regulate NH 4 + The concentration of N is 40-150 mg/L.
The reactor is cleaned to remove algae, and no algae residue is ensured in the reactor. The method is characterized in that 0.93L of mixed sludge of river and lake bottom sludge, 0.93L of nitrifying sludge and 0.93L of anaerobic ammonium oxidation sludge is used as inoculation sludge, the mixing volume ratio is 1:1:1, the inoculation amount is 35 percent of the volume of the device, namely 2.8L, the hydraulic retention time HRT is 24h, and NH4+ -N in wastewater is used as a nitrogen source in inlet water. The pH of the inlet water is adjusted to 7.5-7.8 by hydrochloric acid or sodium hydroxide. Conditions were applied to the reactor to completely block the light operation, preventing the algae from producing oxygen. The reactor continues to operate, the reactor operates stably for 5d, and the denitrification effect is compared and verified.
Example 1 effects:
after the reactor had substantially stabilized, NH was added as shown in FIGS. 2, 3 and 4 4 + The N removal rate is between 72 and 98 percent, and the TN (total nitrogen) removal efficiency is between 60 and 81 percent.
Example 2 effects:
after the reactor had substantially stabilized, NH was added as shown in FIGS. 2, 3 and 4 4 + The N removal rate is between 73 and 98 percent, and the TN removal efficiency is between 60 and 82 percent.
Example 3 effects:
after the reactor had substantially stabilized, NH was added as shown in FIGS. 2, 3 and 4 4 + The N removal rate is between 75 and 98 percent, and the TN removal efficiency is between 60 and 85 percent.
Example 4 effects:
after the reactor had substantially stabilized, NH was added as shown in FIGS. 2, 3 and 4 4 + The N removal rate is between 74% and 98%, and the TN removal efficiency is between 60% and 85%.
Example 5 effects:
after the reactor had substantially stabilized, NH was added as shown in FIGS. 2, 3 and 4 4 + The N removal rate is between 77 and 98 percent, and the TN removal efficiency is between 65 and 88 percent.
Comparative example 1 effects:
after the reactor has substantially stabilized, NH 4 + The N removal rate is between 35% and 45%, and the TN removal efficiency is between 32% and 45%.
The above examples of the present invention are merely examples for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. The full-automatic denitrification process with low energy consumption is characterized in that mixed sludge of river and lake bottom sludge, nitrified sludge and anaerobic ammonium oxidation sludge is adopted as inoculated sludge, oxygen generated by algae in the river and lake bottom sludge is used as an oxygen supply source, an inorganic carbon source is provided for a system, the mixing volume ratio is 1:1: 1-1: 2:4, and the inoculation amount is 2 of the volume of the device0% -35% of NH in wastewater 4 + N is a nitrogen source.
2. The process of claim 1, wherein the main components of the bottom sludge of rivers and lakes are silt, algae in rivers and lakes and ammonia oxidizing bacteria.
3. The process of claim 1, wherein the nitrifying sludge comprises ammonia oxidizing bacteria and nitrifying bacteria as main components.
4. The low-energy-consumption fully-automatic denitrification process according to claim 1, characterized in that the main component of the anammox sludge is anammox bacteria.
5. The process of claim 1, wherein the feed water is feed water from the bottom of the reactor, the gas generated by the reaction is discharged from the vent hole at the top of the reactor by means of continuous feed water, and the effluent is discharged from the overflow weir at the upper part of the reactor.
6. The full-automatic denitrification process with low energy consumption according to claim 1, wherein the pH value of the influent water is adjusted to 7.5-7.8.
7. The process of claim 1, wherein the hydraulic retention time HRT in the reactor is 16-24 h.
8. The process of claim 1, wherein the reactor is operated at 10-30 ℃.
9. The process of claim 1, wherein the pH of the feed water is adjusted by hydrochloric acid or alkali.
10. The low-energy-consumption fully-automatic nitrogen removal process according to any one of claims 1-9, characterized in that feed water NH 4 + -N concentration is: 40-150 mg/L.
CN202210588375.9A 2022-05-27 2022-05-27 Low-energy-consumption full-automatic denitrification process Pending CN114906937A (en)

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CN116040810A (en) * 2023-03-03 2023-05-02 北京工业大学 Sewage treatment system and sewage treatment method

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
CN115259386A (en) * 2022-08-19 2022-11-01 济南大学 System and method for treating wastewater by using oligodynamic bacteria and algae through completely autotrophic biomembrane
CN116040810A (en) * 2023-03-03 2023-05-02 北京工业大学 Sewage treatment system and sewage treatment method

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