CN112320941B - Domestication product N by using separation membrane filler 2 Device and method for O denitrifying bacteria - Google Patents

Domestication product N by using separation membrane filler 2 Device and method for O denitrifying bacteria Download PDF

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CN112320941B
CN112320941B CN202011133506.1A CN202011133506A CN112320941B CN 112320941 B CN112320941 B CN 112320941B CN 202011133506 A CN202011133506 A CN 202011133506A CN 112320941 B CN112320941 B CN 112320941B
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separation membrane
filler
short
denitrifying bacteria
bioreactor
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CN112320941A (en
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吕永涛
王磊
孙婷
何龙
杨雅馨
王旭东
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Xian University of Architecture and Technology
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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
    • C02F3/28—Anaerobic digestion processes
    • 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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/20—Bacteria; Culture media therefor
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor
    • C12N1/38—Chemical stimulation of growth or activity by addition of chemical compounds which are not essential growth factors; Stimulation of growth by removal of a chemical compound
    • 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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  • Chemical & Material Sciences (AREA)
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Abstract

The invention discloses a method for domesticating N by using a separation membrane filler 2 The device and the method for the O denitrifying bacteria comprise a short-range denitrifying bioreactor, a water inlet tank, a water outlet tank, a separation membrane filler, a magnetic stirrer, an aeration system and a PLC control system; the short-range denitrification bioreactor is arranged on a magnetic stirrer and is respectively communicated with a water inlet tank, a water outlet tank and an aeration system, a columnar microporous net filled with a separation membrane filler is arranged in the short-range denitrification bioreactor, and the top of the short-range denitrification bioreactor is communicated with a gas collecting device; the PLC control system controls the water inlet and outlet flow of the short-range denitrification bioreactor to domesticate and enrich floc sludge to produce N 2 And (4) denitrifying bacteria. By converting N produced during short-cut denitrification 2 Transferring O in situ to the filler of separating membrane, and after continuous operation, N 2 The conversion efficiency of O can reach more than 80 percent, thereby realizing the production of N 2 And O denitrifying bacteria enrichment.

Description

Domestication product N by using separation membrane filler 2 Device and method for O denitrifying bacteria
Technical Field
The invention belongs to the field of environmental microorganism and environmental monitoring, and mainly relates to N production in a denitrification process 2 Domestication and enrichment of O denitrifying bacteria.
Background
The eutrophication of water body is increasingly serious, which brings a series of ecological problems, and leads the natural water bodies such as lakes and the like to be swamp and even disappear, and also can harm the health of human bodies. Therefore, nitrogen and phosphorus removal in wastewater is an important way to solve eutrophication of water bodies, and attention is paid to the wastewater.
The biological sewage denitrifying process produces N 2 One of the sources of O. N is a radical of 2 O is a greenhouse gas and a potential renewable energy source, for example, when it is used to oxidize CH instead of oxygen 4 The heat value can be increased by 37%.
CH 4 +4NO 2 →CO 2 +H 2 O+4N 2 H c o ＝-1219KJ/mol
CH 4 +2O 2 →CO 2 +2H 2 O H c o ＝-890KJ/mol
Therefore, the wastewater biological denitrification process enriches N 2 O, not only can carry out energy recovery, but also can reduce N 2 And the emission of O reduces the pollution to the environment. However, in conventional denitrification processes and conditions, N 2 The conversion rate of O is low, and N is difficult to enrich 2 And (O). Research shows that the metabolite of some denitrifying bacteria is N 2 O, thus, N is enriched 2 The O denitrifying bacteria become the key of nitrogen energy regeneration.
Disclosure of Invention
The invention aims to provide a method for domesticating N by using a separation membrane filler 2 An apparatus and method for denitrifying bacteria. Placing a columnar microporous net capable of moving up and down in a short-distance denitrification bioreactor, dispersing a separation membrane filler in the microporous net, enabling floc sludge to enter the columnar microporous net through a magnetic stirrer to be fully contacted with the filler, and enabling N generated in the short-distance denitrification process to be in full contact with the filler 2 Transferring O in situ into the separating membrane filler, and realizing domestication and enrichment to produce N by means of periodic sludge discharge and replacing the separating membrane filler 2 Target of O denitrifying bacteria.
Enriched production of N 2 Denitrifying bacteria of O, thereby increasing N 2 The conversion efficiency of O provides a basis for the energy utilization of nitrogen in the biological denitrification process of sewage.
The invention is realized by the following technical scheme.
Domestication product N by using separation membrane filler 2 Apparatus for O denitrifying bacteria, includingThe device comprises a process denitrification bioreactor, a water inlet tank, a water outlet tank, a separation membrane filler, a magnetic stirrer, an aeration system and a PLC control system; the short-range denitrification bioreactor is arranged on the magnetic stirrer and is respectively communicated with the water inlet tank, the water outlet tank and the aeration system, a separation membrane filler is arranged in the short-range denitrification bioreactor, and the top of the short-range denitrification bioreactor is communicated with a gas collecting device; the water inlet COD/N value, pH value and flow of the short-distance denitrification bioreactor are controlled by a PLC control system, and floc sludge is domesticated and enriched to produce N by separation membrane filler 2 And (4) denitrifying bacteria.
With respect to the above technical solution, a further preferred solution of the present invention is:
preferably, the water inlet tank and the water outlet tank are respectively communicated with the short-cut denitrification bioreactor and are respectively connected with the PLC control system.
Preferably, a columnar microporous net is arranged in the short-range denitrification bioreactor, and the separation membrane filler is arranged in the columnar microporous net.
Preferably, the separation membrane filler is spherical, the separation membrane filler shell is a separation membrane made of polytetrafluoroethylene or polyethylene, and ether or fatty oil is wrapped inside the separation membrane filler shell.
Preferably, the aeration system comprises an argon bottle, a flow meter and a microporous aeration head, wherein the microporous aeration head is arranged outside a columnar microporous net in the short-cut denitrification bioreactor and is communicated with the flow meter and the argon bottle through a pipeline.
Preferably, a magnetic rotor is arranged on the magnetic stirrer.
The device of the invention is adopted to produce N by domesticating the filler of the separation membrane 2 A method of O-denitrifying bacteria, comprising the steps of:
controlling the COD/N value, pH value and flow of inlet water of the short-distance denitrification bioreactor by a PLC control system;
magnetic stirring is carried out to ensure that floc sludge enters a microporous net and is fully contacted with a separation membrane filler;
n generated in the short-cut denitrification process by utilizing separation membrane filler 2 Transferring O in situ to the filler of separating membrane, periodically discharging sludge, replacing the filler of separating membrane, and continuously operating for one period，N 2 The conversion efficiency of O reaches more than 80 percent, and the production of N is realized 2 And (4) enriching the O denitrifying bacteria.
Preferably, the main substrates of the inlet water are nitrite and soluble organic matters, the COD/N value of the inlet water is 1.5-3, and the pH value of the inlet water is 6.5-7.0; one period is 20d.
Preferably, the periodic mud discharge period is: controlling the SRT to be 8-10 d.
Preferably, the replacement period of the replacement of the separation membrane filler is 5 to 6 days/time.
Compared with the existing enrichment with N 2 Compared with the denitrifying bacteria process taking O as a metabolite, the invention has the beneficial effects that:
(1) The invention arranges a columnar microporous net capable of moving up and down in a short-distance denitrification bioreactor, the floccule sludge enters the columnar microporous net to be fully contacted with a separation membrane filler through a magnetic stirrer, and the separation membrane filler is utilized to lead N generated in the short-distance denitrification process to be 2 Transferring O into the separating membrane filler in situ, and removing mud and replacing the separating membrane filler periodically, wherein N is 2 The conversion efficiency of O can reach more than 80 percent.
(2) By controlling the COD/N value, pH and flow of the inlet water of the short-distance denitrification bioreactor, the aim is to control the nitrite reduction product to be N 2 O, preventing its over-reduction to nitrogen.
(3) Packing diethyl ether or fatty oil in the casing by separating membrane to utilize N 2 The solubility of O in ether or fatty oil is far higher than that in water, so that N generated in the denitrification process 2 The O rapidly penetrates through the micropores of the separation membrane to enter the interior of the filler, and is prevented from being further reduced into nitrogen.
The invention has mild reaction condition and N 2 High O conversion efficiency.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
FIG. 1 shows domesticated product N 2 Schematic diagram of O denitrifying bacteria device；
FIG. 2 is a perspective view of a cylindrical microporous web;
FIG. 3 is a top view of a separation membrane packing;
FIG. 4 shows the enrichment of N by using separation membrane packing 2 And O, effect graph.
In FIG. 1, 1. Argon cylinder; 2. a glass rotameter; 3. a magnetic stirrer; 4. a magnetic rotor; 5. a columnar microporous network; 6. a water inlet tank; 7. a water outlet tank; 8, a PLC control system; 9. a short-cut denitrification bioreactor; 10. separating membrane packing; 11. a microporous aeration head; 12. flocculating sludge; 13. a gas collection device; 14. and (4) a valve.
In FIG. 3, 101. Micropores in the surface of the separation membrane packing; 102. the separation membrane filler is filled with liquid.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the invention thereto.
As shown in figure 1, the present invention utilizes separation membrane filler domestication to produce N 2 The device for the O denitrifying bacteria comprises an argon gas bottle 1, a glass rotameter 2, a magnetic stirrer 3, a magnetic rotor 4, a columnar microporous net 5, a water inlet tank 6, a water outlet tank 7, a PLC (programmable logic controller) control system 8, a short-range denitrification bioreactor 9 and a separation membrane filler 10, wherein the argon gas bottle 1 is connected with the short-range denitrification bioreactor 9, and the argon gas bottle 1 and the short-range denitrification bioreactor 9 are communicated with the glass rotameter 2 through a pipeline; a columnar microporous net 5 filled with a separation membrane filler 10 is arranged in the short-cut denitrification bioreactor 9; the short-range denitrification bioreactor 9 is respectively communicated with the water inlet tank 6, the water outlet tank 7 and the aeration system, the water inlet tank 6 and the water outlet tank 7 are also respectively communicated with the short-range denitrification bioreactor 9 through pipelines, and the top of the short-range denitrification bioreactor 9 is communicated with a gas collecting device 13 through a valve 14. The short-range denitrification bioreactor 9 is placed on a magnetic stirrer 3, a magnetic rotor 4 is arranged on the magnetic stirrer 3, floc sludge 12 enters a columnar microporous net 5 through the magnetic rotor 4 to be fully contacted with a separation membrane filler 10, a water inlet tank 6 and a water outlet tank 7 are respectively connected with a PLC (programmable logic controller) control system 8, and the short-range denitrification bioreactor is controlled by the PLC control system 8The water inlet and outlet flow of the denitrification bioreactor 9 acclimates and enriches the floc sludge to produce N 2 And (4) denitrifying bacteria.
The aeration system comprises an argon gas bottle 1, a flow meter 2 and a microporous aeration head 11, the microporous aeration head 11 is arranged outside a columnar microporous mesh 5 in the short-range denitrification bioreactor 9 and is communicated with the flow meter 2 and the argon gas bottle 1 through a pipeline, and the other end of the glass rotameter is connected with the microporous aeration head for supplying N 2 O conversion was measured.
In one embodiment, the separation membrane packing used is spherical with an average diameter of 2mm, as shown in FIG. 3. The filler shell is a separation membrane made of polytetrafluoroethylene or polyethylene, the internal filling liquid 102 of the internal separation membrane filler is diethyl ether or fatty oil, the pore diameter of micropores 101 on the surface of the separation membrane filler is 0.1-0.5um, and the thickness of the membrane is 20-30um; the aperture of the columnar microporous net for intercepting and separating the membrane filler is 1mm. The structure of the columnar microporous network is shown in detail in fig. 2.
This example utilizes separation membrane packing to acclimate to produce N 2 The O denitrifying bacteria method includes moving the columnar microporous net up and down, dispersing separating film stuffing inside the net, setting inside short-range denitrifying bioreactor, making the flocculated sludge contact with the separating film stuffing via magnetic stirrer, and utilizing the separating film stuffing to separate N produced in the short-range denitrifying process 2 Transferring the O into the separation membrane filler in situ, and controlling the value of COD/N of the inlet water to be 1.5-3 and the pH value of the inlet water to be 6.5-7.0 by a PLC control system; the flow rate is HRT =6h; after the continuous operation for 20d, N is carried out by periodically discharging sludge and replacing separating membrane filler 2 The conversion efficiency of O can reach more than 80 percent, thereby realizing the production of N 2 And O denitrifying bacteria enrichment. Wherein, the main matrix of reactor intaking is nitrite and soluble organic matter, and the cycle of regularly arranging mud: controlling the SRT to be 8-10 d, and the replacement period of the filler to be 5-6 days/time.
The following examples further illustrate the practice of the method of the present invention.
The denitrification bioreactor shown in figure 1 is adopted, a columnar microporous net which can move up and down is arranged in the reactor, the aperture of the microporous net is 1mm, and the average diameter is dispersed in the microporous netThe diameter is 2 mm's separation membrane filler, and the material of separation membrane is polyethylene, and the average pore diameter is 0.35um, and inside parcel has the fatty oil. The reactor is inoculated with common activated sludge with the concentration of about 3500mg/L, the water inlet substrates are sodium nitrite and sodium acetate, and the concentrations are respectively as follows: nitrite nitrogen is 60mg/L, COD is 150mg/L, the pH value of inlet water is adjusted to 6.6, and the flow of inlet water and outlet water is controlled by PLC, so that HRT is 6h. In the operation process, sludge is periodically discharged, SRT =9d is maintained, separation membrane filler is replaced once every 5 days, and N in the system is periodically measured 2 Conversion efficiency of O. The effect is shown in figure 4.
As can be seen from FIG. 4, the N of the inoculated sludge 2 O conversion was only 0.2%, with real-time addition of N 2 O is converted into the inside of the separation membrane filler, so that the N production is enhanced 2 Growth conditions of O-reducing bacteria, N 2 The conversion rate of O is gradually improved to 43% at 12 d; at time 20d, N 2 The conversion rate of O reaches 82 percent, and then the O gradually stabilizes to about 84 percent, which indicates that the N is produced 2 The O reducing bacteria have been enriched.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.

Claims (9)

1. Domestication product N by using separation membrane filler 2 The device for the O denitrifying bacteria is characterized by comprising a short-cut denitrifying bioreactor, a water inlet tank, a water outlet tank, a separation membrane filler, a magnetic stirrer, an aeration system and a PLC control system; the short-cut denitrification bioreactor is arranged on the magnetic stirrer and is respectively communicated with the water inlet tank, the water outlet tank and the aeration system, a separation membrane filler is arranged in the short-cut denitrification bioreactor, and the top of the short-cut denitrification bioreactor is communicated with a gas collecting device;
the water inlet COD/N value, the pH value and the flow of the short-distance denitrification bioreactor are controlled by a PLC control system, and floc sludge is domesticated and enriched to produce N by a separation membrane filler 2 O denitrifying bacteria;
the separation membrane filler is spherical, the shell of the separation membrane filler is a separation membrane made of polytetrafluoroethylene or polyethylene, and ether or fatty oil is wrapped inside the shell.
2. The process of claim 1 for domesticating N using separation membrane packing 2 The device for the O denitrifying bacteria is characterized in that the water inlet tank and the water outlet tank are respectively communicated with the short-cut denitrifying bioreactor and are respectively connected with a PLC control system.
3. The domestication of N with separation membrane filler as claimed in claim 1 2 The device for the O denitrifying bacteria is characterized in that a columnar microporous net is arranged in the short-cut denitrifying bioreactor, and a separation membrane filler is arranged in the columnar microporous net.
4. The domestication of N with separation membrane filler as claimed in claim 1 2 The device for the O denitrifying bacteria is characterized in that the aeration system comprises an argon gas bottle, a flow meter and a microporous aeration head, wherein the microporous aeration head is arranged outside a columnar microporous mesh in the short-cut denitrifying bioreactor and is communicated with the flow meter and the argon gas bottle through a pipeline.
5. The domestication of N with separation membrane filler as claimed in claim 1 2 The device for the O denitrifying bacteria is characterized in that a magnetic rotor is arranged on the magnetic stirrer.
6. A domestication product N using a separation membrane filler based on the device of any one of claims 1 to 5 2 The method for the O denitrifying bacteria is characterized by comprising the following steps:
controlling the COD/N value, the pH value and the flow of inlet water of the short-distance denitrification bioreactor through a PLC control system;
magnetic stirring is carried out to ensure that floc sludge enters a microporous net and is fully contacted with a separation membrane filler;
n generated in the short-cut denitrification process by utilizing separation membrane filler 2 O in situ transfer to separation membraneIn the filler, N is obtained after the filler is continuously operated for one period by periodically discharging mud and replacing the filler of the separation membrane 2 The conversion efficiency of O reaches more than 80 percent, and the production of N is realized 2 And (4) enriching the O denitrifying bacteria.
7. The domestication of N with separation membrane packing as claimed in claim 6 2 The method for the denitrifying bacteria is characterized in that main matrixes of inlet water are nitrite and soluble organic matters, the COD/N value of the inlet water is 1.5 to 3, and the pH value of the inlet water is 6.5 to 7.0; one period is 20d.
8. The domestication of N with separation membrane packing as claimed in claim 6 2 The method for the O denitrifying bacteria is characterized in that the periodic sludge discharge period is as follows: the SRT is controlled to be 8 to 10d.
9. The domestication of N with separation membrane packing as claimed in claim 6 2 The method for replacing the separation membrane filler is characterized in that the replacement period for replacing the separation membrane filler is 5~6 days/time.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000206087A (en) * 1999-01-13 2000-07-28 Fuji Electric Co Ltd Method and device for detecting nitrification-blocking substance in sewage and discharged water
JP2011189261A (en) * 2010-03-12 2011-09-29 Mitsubishi Rayon Co Ltd Biological treatment system, and biological treatment method
CN102272042A (en) * 2009-01-08 2011-12-07 罗伯特·博世有限公司 Method for obtaining dinitrogen oxide
CN102732466A (en) * 2012-07-04 2012-10-17 中国农业科学院农业环境与可持续发展研究所 Method for culturing denitrifying bacterium and determining water body nitrate nitrogen isotope composition
WO2018004314A1 (en) * 2016-06-30 2018-01-04 한국화학연구원 Nitrous oxide selective gas separation membrane and method for purifying nitrous oxide using same
CN107827232A (en) * 2017-11-09 2018-03-23 北京建筑大学 One kind is with N2O is the cultural method of the denitrifying bacterium of end-product
CN109970199A (en) * 2019-04-28 2019-07-05 华东理工大学 Biological denitrificaion couples N2O recycles integrated reactor and its method
WO2020036458A1 (en) * 2018-08-17 2020-02-20 한국과학기술원 Method for producing nitrous oxide in sewage/wastewater treatment process

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000206087A (en) * 1999-01-13 2000-07-28 Fuji Electric Co Ltd Method and device for detecting nitrification-blocking substance in sewage and discharged water
CN102272042A (en) * 2009-01-08 2011-12-07 罗伯特·博世有限公司 Method for obtaining dinitrogen oxide
JP2011189261A (en) * 2010-03-12 2011-09-29 Mitsubishi Rayon Co Ltd Biological treatment system, and biological treatment method
CN102732466A (en) * 2012-07-04 2012-10-17 中国农业科学院农业环境与可持续发展研究所 Method for culturing denitrifying bacterium and determining water body nitrate nitrogen isotope composition
WO2018004314A1 (en) * 2016-06-30 2018-01-04 한국화학연구원 Nitrous oxide selective gas separation membrane and method for purifying nitrous oxide using same
CN107827232A (en) * 2017-11-09 2018-03-23 北京建筑大学 One kind is with N2O is the cultural method of the denitrifying bacterium of end-product
WO2020036458A1 (en) * 2018-08-17 2020-02-20 한국과학기술원 Method for producing nitrous oxide in sewage/wastewater treatment process
CN109970199A (en) * 2019-04-28 2019-07-05 华东理工大学 Biological denitrificaion couples N2O recycles integrated reactor and its method

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