CN115677043A - Novel technology for efficiently denitrifying low-salt low-C/N wastewater - Google Patents

Novel technology for efficiently denitrifying low-salt low-C/N wastewater Download PDF

Info

Publication number
CN115677043A
CN115677043A CN202211401673.9A CN202211401673A CN115677043A CN 115677043 A CN115677043 A CN 115677043A CN 202211401673 A CN202211401673 A CN 202211401673A CN 115677043 A CN115677043 A CN 115677043A
Authority
CN
China
Prior art keywords
reactor
low
wastewater
salt
denitrification
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202211401673.9A
Other languages
Chinese (zh)
Inventor
陆立海
黄雪娇
谢春敏
刘熹
熊建华
樊文杰
江赵洁
韦海浪
刘俊超
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangxi Bossco Environmental Protection Technology Co Ltd
Original Assignee
Guangxi Bossco Environmental Protection Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangxi Bossco Environmental Protection Technology Co Ltd filed Critical Guangxi Bossco Environmental Protection Technology Co Ltd
Priority to CN202211401673.9A priority Critical patent/CN115677043A/en
Publication of CN115677043A publication Critical patent/CN115677043A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • 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

Landscapes

  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The invention provides a novel technology for efficiently denitrifying low-salt low-C/N wastewater, which belongs to the technical field of biological denitrification. Compared with the conventional heterotrophic denitrification process, the method saves carbon sources, reduces sludge discharge and secondary pollution, and also forms a good sulfur autotrophic/heterotrophic synergetic denitrification system; when the HRT is set to be 4h, the removal effect on 30mg/L nitrate nitrogen can reach 96%, and the system is stable and efficient; under the condition of adding 2g/L of low salt, the system has no inhibition effect and operates normally and efficiently; the technology has low cost, simple and convenient operation and obvious denitrification effect, and can be applied in large scale.

Description

Novel technology for efficiently denitrifying low-salt low-C/N wastewater
Technical Field
The invention relates to the technical field of biological denitrification, in particular to a novel technology for efficiently denitrifying low-salt low-C/N wastewater.
Background
The traditional biological denitrification process adopts nitrification and denitrification processes, and has the defects of high sludge yield, additional carbon source, high operation cost and the like. The principle of sulfur autotrophic denitrification is that some inorganic energy-transforming nutritional type and light energy-nutritional type sulfur oxidizing bacteria can utilize reduced sulfur (S) under the condition of oxygen deficiency or anaerobic condition 0 、S 2- 、S 2 O 3 2- Etc.) as electron donors to obtain energy by oxidation of reduced sulfur, while using nitrate as electron acceptor to reduce it to nitrogen, using inorganic carbon (e.g., CO) 3 2- 、HCO 3 - ) Synthesizing cells, thereby realizing the autotrophic denitrification process. The sulfur autotrophic denitrification technology has the advantages of no need of adding external carbon source, low sludge yield and the like.
Elemental sulfur (S) 0 ) As central intermediates in the sulfur cycle on earth, there are some advantages over other sulfur intermediates (such as sulfides, thiosulfates and sulfates): (1) are abundant resources on earth; (2) has versatility, allowing for oxidation and reduction; and (3) when the solid state is realized, the storage is safer, and the transportation cost is low. Thus, the use of S has been widely reported in the past decades 0 Reducing and oxidizing properties to treat wastewater. Applications include S 0 Driven autotrophic denitrification (S) 0 AD) is composed of some S 0 Oxidizing bacterium (S) 0 OB). In common reduced sulfur, sulfide can inhibit the activity of aquatic microorganisms, the preparation of thiosulfate is complex, and elemental sulfur has the characteristics of no toxicity, insolubility in water, economy, effectiveness and the like, and is better before applicationAnd (5) landscape.
At present, sulfur autotrophic denitrification technology taking elemental sulfur as an electron donor is widely applied, but the reaction has the defects of slow start-up time, low stability, unsatisfactory denitrification efficiency, general salt tolerance and the like. Therefore, the development of a system with quick start, good stability, excellent denitrification effect and salt tolerance is the key point of the research of the sulfur autotrophic denitrification technology, and a new technology for efficiently denitrifying low-salt low-C/N wastewater is needed.
Disclosure of Invention
The invention aims to provide a novel technology for efficiently denitrifying low-salt low-C/N wastewater, and solves the technical problems of slow start-up time, low stability, unsatisfactory denitrification efficiency and general salt tolerance in the prior art. The reactor is started by a biological biofilm culturing method, artificial water distribution is introduced, a good autotrophic/heterotrophic synergetic denitrification system is formed, when the HRT is 4 hours, the removal effect of 30mg/L nitrate nitrogen can reach 96%, and the system has no inhibition effect and operates normally and efficiently under the condition of 2% low salt; has the characteristics of quick start, low salt resistance, excellent denitrification effect and stable system.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a new technology for efficiently denitrifying low-salt low-C/N wastewater comprises the following steps:
(1) Selection of a reactor: selecting a cylindrical upflow denitrification bioreactor, wherein the reactor is made of organic glass, the inner diameter of the reactor is 8.6cm, the outer diameter of the reactor is 9.6cm, the height of the reactor is 90cm, the effective volume of the reactor is 4L, a filler and artificially prepared wastewater are arranged in the reactor, the height of the filler is 22.5cm, and the volume of the water is 2.2L;
(2) Starting the reactor: the reactor is started by adopting a biofilm hanging method, the reactor starting condition is explored by monitoring the effluent quality in the reactor and the operation effect of the reactor, the reactor starting sludge is taken from domestic sewage activated sludge, and the NO of the effluent is detected every day 3 - ，NO 2 - Concentration of indexes such as TN, and the like, and NO was measured continuously for one week 3 - The removal effect of TN reaches 90 percentAbove and NO NO 2 - Accumulation, obvious biofilm attachment can be seen, indicating that the reactor is successfully started;
(3) Stable operation phase of the reactor: the water is artificially prepared into the wastewater in the stable operation stage of the reactor, and the wastewater formula is as follows: adding 0.033g of glucose, 0.182g of sodium nitrate, 0.0045g of monopotassium phosphate and 1mL/L of trace element nutrient solution into 1L of tap water, setting HRT to 10h in 0-5 days, HRT to 7h in 5-10 days, HRT to 4h in 10-25 days, and adjusting NO to 4h during HRT 3 - TN can be removed up to 95% without NO 2 - 、NH 4 + Accumulation, quick start is realized, and the system stably runs;
(4) After stable operation for 15 days, 2g/L NaCl is added into the water distribution to observe whether the sulfur autotrophic/heterotrophic synergistic system inhibits the denitrification efficiency under the condition of low salt, and the result shows that the low salt has NO influence on the reaction system, the system normally operates, and the NO is inhibited 3 - 5363 and removing efficiency of N, TN reaches 96%.
Further, in the step (1), the filler in the reactor is sulfur and limestone particles, and the volume ratio of the sulfur to the limestone particles is 1:1, the grain diameter of the sulfur is 3-4mm, and the grain diameter of the limestone particles is 2-3mm.
Further, in the step (2), the index concentration of the acclimated wastewater is as follows: NO 3 - -N＝20mg/L，NO 2 - -N＝9mg/L，NH 4 + -N =3mg/L, TN =30mg/L, COD =30mg/L, pH 7.5.
Further, in step (2), the water consumption for starting the reactor is as follows: HRT is 10h in 0-7 days, and HRT is 7h in 7-15 days.
Further, in the step (3), the index concentration of the wastewater quality is as follows: COD = 30. + -.2 mg/L, PO 4 3- ＝1±0.2mg/L，NO 3 - =30 ± 1mg/L, pH 7.0-7.2.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
the reactor is started through a biological biofilm culturing method, artificial water distribution is introduced, a good autotrophic/heterotrophic synergetic denitrification system is formed, when the HRT is 4 hours, the removal effect on various nitrogen elements can reach 96%, and the system has no inhibition effect under the condition of 2% low salt and operates normally and efficiently; has the characteristics of quick start, low salt resistance, excellent denitrification effect and stable system.
Drawings
FIG. 1 is a graph showing the variation of nitrogen index in start-up and steady operation of the present invention;
FIG. 2 is a graph showing the change in pH and COD at the steady operation stage of the present invention;
FIG. 3 shows the effluent SO at the steady operation stage of the present invention 4 2- Concentration;
FIG. 4 is a graph of the change in nitrogen concentration over the 2g/L NaCl phase (HRT =4 h) of the invention;
fig. 5 is a graph of the change in COD concentration and pH for the 2g/L NaCl phase (HRT =4 h) of the invention;
fig. 6 is a graph of the change in the sulphate concentration of the effluent from the 2g/L NaCl stage (HRT =4 h) of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings by way of examples of preferred embodiments. It should be noted, however, that the numerous details set forth in the description are merely for the purpose of providing the reader with a thorough understanding of one or more aspects of the present invention, which may be practiced without these specific details.
As shown in the figure 1-2, a new technology for efficiently denitrifying low-salt low-C/N wastewater comprises the following steps: the method comprises the following steps:
(1) Selection of a reactor: selecting a cylindrical upflow denitrification bioreactor, wherein the reactor is made of organic glass, the inner diameter of the reactor is 8.6cm, the outer diameter of the reactor is 9.6cm, the height of the reactor is 90cm, the effective volume of the reactor is 4L, a filler and artificially prepared wastewater are arranged in the reactor, the height of the filler is 22.5cm, and the volume of the water is 2.2L; the filler in the reactor is sulfur and limestone particles, and the volume ratio of the sulfur to the limestone particles is 1:1, the particle size of sulfur is 3-4mm, and the particle size of limestone particles is 2-3mm; by adopting an upflow water inlet running mode, the smaller the particle size, the larger the specific surface area of the filler, the microorganisms can be attached to the sulfur and limestone filler, meanwhile, the sulfur is consumed to generate energy, part of the energy is used for realizing the denitrification process, and the other part of the energy is used for the self growth of bacteria.
(2) Starting the reactor: the reactor is started by adopting a biofilm hanging method, the reactor starting condition is explored by monitoring the effluent quality in the reactor and the operation effect of the reactor, the reactor starting sludge is taken from domestic sewage activated sludge, and the NO of the effluent is detected every day 3 - ，NO 2 - Concentration of indexes such as TN, and the like, and NO was measured continuously for one week 3 - The removal effect of TN reaches more than 90 percent, and NO NO is generated 2 - Accumulation, obvious biofilm attachment can be seen, indicating that the reactor is successfully started; the index concentration of the domesticated wastewater is as follows: NO 3 - -N＝20mg/L，NO 2 - -N＝9mg/L，NH 4 + -N =3mg/L, TN =30mg/L, COD =30mg/L, pH 7.5; the water consumption for starting the reactor is as follows: HRT is 10h in 0-7 days, and HRT is 7h in 7-15 days; the inoculation wastewater contains a large amount of various microorganisms, so that the culture and domestication time of the microorganisms can be shortened.
(3) Stable operation stage of the reactor: the water inlet at the stable operation stage of the reactor adopts artificial wastewater preparation, and the wastewater formula is as follows: adding 0.033g of glucose, 0.182g of sodium nitrate, 0.0045g of monopotassium phosphate and 1mL/L of trace element nutrient solution into 1L of tap water, setting HRT to 10h in 0-5 days, HRT to 7h in 5-10 days, HRT to 4h in 10-25 days, and adjusting NO to 4h during HRT 3 - TN can be removed up to 95% without NO 2 - 、NH 4 + Accumulation, quick start is realized, and the system stably operates; the index concentration of the wastewater quality is as follows: COD = 30. + -.2 mg/L, PO 4 3- ＝1±0.2mg/L，NO 3 - =30 ± 1mg/L, pH 7.0-7.2. After the glucose organic carbon source is added, the system can be well adapted to artificial water distribution, the microorganism grows rapidly, the denitrification effect is good, compared with the conventional heterotrophic denitrification process, the carbon source is saved, and the sludge is reducedDischarge and secondary pollution, and also form a good sulfur autotrophic/heterotrophic synergetic denitrification system; the coupling advantages of the sulfur autotrophic denitrification and the heterotrophic denitrification are as follows: (1) the addition of alkalinity can be reduced, and the cost is reduced; (2) under the reinforcement of carbon source, heterotrophic denitrification reaction bears part of NO 3 - And the N load effectively improves the denitrification efficiency and ensures that the content of organic matters in the effluent is lower.
(4) After stable operation for 15 days, 2g/L NaCl is added into the water, and whether the sulfur autotrophic/heterotrophic synergistic system inhibits the denitrification efficiency under the condition of low salt is observed, and the result shows that the low salt has NO influence on the reaction system, the system operates normally, and NO is inhibited 3 - 5363 the removal effect of N, TN can reach 96%.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be construed as the protection scope of the present invention.

Claims (5)

1. A new technology for efficiently denitrifying low-salt low-C/N wastewater is characterized in that: the method comprises the following steps:
(1) Selection of a reactor: selecting a cylindrical upflow denitrification bioreactor, wherein the reactor is made of organic glass, the inner diameter of the reactor is 8.6cm, the outer diameter of the reactor is 9.6cm, the height of the reactor is 90cm, the effective volume of the reactor is 4L, a filler and artificially prepared wastewater are arranged in the reactor, the height of the filler is 22.5cm, and the volume of the water is 2.2L;
(2) Starting the reactor: the reactor is started by adopting a biofilm culturing method, the starting condition of the reactor is explored by monitoring the quality of effluent water in the reactor and the operation effect of the reactor, the reactor starting sludge is taken from domestic sewage activated sludge, and NO of effluent water is detected every day 3 - ，NO 2 - Concentration of indexes such as TN, and the like, and NO was measured continuously for one week 3 - The removal effect of TN reaches more than 90 percent, and NO NO is generated 2 - Accumulation of the biofilm can be seenThen, the reactor start-up was successful;
(3) Stable operation phase of the reactor: the water is artificially prepared into the wastewater in the stable operation stage of the reactor, and the wastewater formula is as follows: adding 0.033g glucose, 0.182g sodium nitrate, 0.0045g potassium dihydrogen phosphate and 1mL/L microelement nutrient solution into 1L tap water, setting HRT at 10 hr for 0-5 days, 7h for 5-10 days, 4h for 10-25 days, and adding NO during 4h HRT 3 - TN can be removed up to 95% without NO 2 - 、NH 4 + Accumulation, quick start is realized, and the system stably operates;
(4) After stable operation for 15 days, 2g/L NaCl is added into the water, and whether the sulfur autotrophic/heterotrophic synergistic system inhibits the denitrification efficiency under the condition of low salt is observed, and the result shows that the low salt has NO influence on the reaction system, the system operates normally, and NO is inhibited 3 - 5363 and removing efficiency of N, TN reaches 96%.
2. The new technology for denitrogenating low-salt low-C/N waste water with high efficiency as claimed in claim 1, characterized in that: in the step (1), the filling materials in the reactor are sulfur and limestone particles, and the volume ratio of the sulfur to the limestone particles is 1:1, the particle size of the sulfur is 3-4mm, and the particle size of the limestone particles is 2-3mm.
3. The new technology for denitrogenating low-salt low-C/N waste water with high efficiency as claimed in claim 1, characterized in that: in the step (2), the index concentration of the domesticated wastewater is as follows: NO (nitric oxide) 3 - -N＝20mg/L，NO 2 - -N＝9mg/L，NH 4 + -N =3mg/L, TN =30mg/L, COD =30mg/L, pH 7.5.
4. The new technology for high-efficiency denitrification of low-salt low-C/N wastewater as claimed in claim 1, characterized in that: in the step (2), the water consumption for starting the reactor is as follows: HRT was 10h for 0-7 days and 7h for 7-15 days.
5. A method as claimed in claim 1The new technology for efficiently denitrifying low-salt low-C/N wastewater is characterized in that: in the step (3), the index concentration of the wastewater quality is as follows: COD = 30. + -.2 mg/L, PO 4 3- ＝1±0.2mg/L，NO 3 - =30 ± 1mg/L, pH 7.0-7.2.
CN202211401673.9A 2022-11-09 2022-11-09 Novel technology for efficiently denitrifying low-salt low-C/N wastewater Pending CN115677043A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211401673.9A CN115677043A (en) 2022-11-09 2022-11-09 Novel technology for efficiently denitrifying low-salt low-C/N wastewater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211401673.9A CN115677043A (en) 2022-11-09 2022-11-09 Novel technology for efficiently denitrifying low-salt low-C/N wastewater

Publications (1)

Publication Number Publication Date
CN115677043A true CN115677043A (en) 2023-02-03

Family

ID=85050859

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202211401673.9A Pending CN115677043A (en) 2022-11-09 2022-11-09 Novel technology for efficiently denitrifying low-salt low-C/N wastewater

Country Status (1)

Country Link
CN (1) CN115677043A (en)

Similar Documents

Publication Publication Date Title
Ma et al. Biological nitrogen removal from sewage via anammox: recent advances
CN112158952B (en) Device and method for treating low-carbon-nitrogen-ratio wastewater through continuous flow AOA (argon oxygen decarburization) shortcut nitrification and anaerobic ammonia oxidation coupling sludge fermentation denitrification
CN106830324B (en) Sectional water inlet A2Device and method for enhancing biological nitrogen and phosphorus removal by adopting/O (oxygen/phosphorus) process
CN102259976B (en) Method for quickly starting anaerobic ammonia oxidation reactor
CN101439915B (en) Membrane aeration biomembrane process and apparatus for sewerage short-cut denitrification
CN109970200B (en) Device and method for treating urban domestic sewage based on coupling of short-cut denitrification dephosphorization and anaerobic ammonia oxidation
CN103723821B (en) Method for rapid mutagenesis of autotrophic nitrosation sludge from complete nitrifying sludge
CN110002591B (en) Device and method for realizing shortcut nitrification-denitrification dephosphorization coupling of municipal domestic sewage under anoxic/aerobic alternate condition
CN110950428B (en) Method for culturing sludge with synchronous sulfur autotrophic denitrification and anaerobic ammonia oxidation functions
CN101767872B (en) Methanation, denitrification and anammox coupling process based sewage treatment process
CN114230006A (en) Natural enrichment method for anaerobic ammonium oxidation bacteria
CN113716689B (en) Mixed nutrition type denitrification method based on sulfur reduction and sulfur autotrophic denitrification
AU2021103760A4 (en) Two-sludge sequencing batch reactor (SBR) denitrifying phosphorous removal device and stoichiometric control method
CN111410303A (en) Rapid forming method for coupling denitrification anaerobic methane oxidation and anaerobic ammonia oxidation to granular sludge
CN104817178A (en) Short-range denitrification/dephosphorization device and method based on sludge side pretreatment
CN106542636A (en) A kind of method of quick startup whole process autotrophic denitrification
CN112250179B (en) Device and method for realizing short-cut nitrification-anaerobic ammonia oxidation denitrification in sewage treatment continuous flow process through sludge fermentation product
CN110921824B (en) Culture method for denitrification capacity of anaerobic ammonia oxidation sludge
CN116062890B (en) Device and method for treating high ammonia nitrogen cultivation wastewater by combining anaerobic hydrolysis with short-cut nitrification and short-cut denitrification anaerobic ammonia oxidation
CN115028265B (en) Device and method for strengthening PD/A (potential device)/treating urban sewage by coupling continuous flow staged water inflow with pretreatment fermentation sludge staged reflux
KR100446577B1 (en) Method for Eliminating Nitrogen Using Granule of Nitrifying Microorganisms
CN114477456A (en) Endogenous short-cut denitrification enhanced municipal sewage short-cut nitrification/anaerobic ammonia oxidation deep denitrification device and method
CN115677043A (en) Novel technology for efficiently denitrifying low-salt low-C/N wastewater
CN113929210A (en) Device and method for enhancing carbon source utilization and deep denitrification in mainstream municipal sewage by fermenting and producing acid through side flow sludge
CN103011409B (en) Method for realizing stable operation of nitrosification of domestic sewage in sequencing batch reactor (SBR) by using intermittent aeration

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination