CN105668794A - A/O bio-membrane denitrifying device and method for treating low-C/N sewage - Google Patents

A/O bio-membrane denitrifying device and method for treating low-C/N sewage Download PDF

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Publication number
CN105668794A
CN105668794A CN201610238027.3A CN201610238027A CN105668794A CN 105668794 A CN105668794 A CN 105668794A CN 201610238027 A CN201610238027 A CN 201610238027A CN 105668794 A CN105668794 A CN 105668794A
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biofilm reactor
bio
biomembrane
sewage
nitrogen
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CN105668794B (en
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马斌
彭永臻
委燕
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Beijing University of Technology
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/30Aerobic and anaerobic processes
    • C02F3/302Nitrification and denitrification treatment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/34Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/04Flow arrangements
    • C02F2301/046Recirculation with an external loop
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/02Aerobic processes
    • C02F3/12Activated sludge processes
    • C02F3/1236Particular type of activated sludge installations
    • C02F3/1268Membrane bioreactor systems
    • C02F3/1273Submerged membrane bioreactors
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00Biological treatment of water, waste water, or sewage
    • C02F3/28Anaerobic digestion processes
    • C02F3/2853Anaerobic digestion processes using anaerobic membrane bioreactors

Abstract

The invention discloses an A/O bio-membrane denitrifying device and method for treating low-C/N sewage. The device comprises a raw water tank, a water inlet pump, an A-section bio-membrane reactor, an O-section bio-membrane reactor, a nitrifying liquid internal reflux pump. The raw water tank is a closed box and is provided with an overflow pipe and a blow-down pipe; the A-section bio-membrane reactor is shaped like a column and is divided into an upper section and a lower section according to the water flow direction, the lower section adopts a short-cut denitrification bio-membrane, and the upper section adopts an anaerobic ammonia oxidation bio-membrane; the O-section bio-membrane reactor is shaped like a column and is filled with a nitrifying bio-membrane. According to the denitrifying method, short-cut denitrification is achieved through the lower section of the A-section bio-membrane reactor, organic carbon sources in the sewage are utilized, and nitrate nitrogen carried by reflux nitrifying liquid is reduced to nitrite nitrogen; anaerobic ammonia oxidation is achieved through the upper section bio-membrane, and partial ammonia nitrogen in the sewage and nitrite nitrogen accumulated through short-cut denitrification are converted into nitrogen; residual ammonia nitrogen in the sewage is oxidized into nitrate nitrogen through the O-section bio-membrane reactor, and efficient nitrogen removal of the low-C/N sewage is achieved.

Description

A kind of A/O biomembrane denitrogenation apparatus and method processing low C/N sewage
Technical field
The present invention relates to a kind of A/O biomembrane denitrogenation apparatus and method processing low C/N sewage, belong to technical field of biological sewage treatment.
Background technology
Current bio-denitrifying sewage adopts traditional biological nitrification and denitrification denitrogenation technology mostly, and needs organic carbon source as electron donor in denitrification process, is nitrogen by reduction of nitrogen oxide. Therefore it is difficult to efficient denitrification containing the low C/N sewage that organic carbon source is not enough, for qualified discharge, it is necessary to add outer carbon source to improve denitrification effect, thus adding sewage disposal expense.
Traditional biological denitrification process is that to pass sequentially through the nitrate-nitrogen reduction enzyme of denitrification strain, nitrite nitrogen reductase, nitric oxidereductase and nitrous oxide reductase effect be progressively nitrogen by nitrate-nitrogen reduction. Current research shows that part denitrifying bacterium can only secrete nitrate-nitrogen reduction enzyme, so that the rate of reduction of nitrite nitrogen is less than the rate of reduction of nitrate nitrogen, causes the accumulation occurring nitrite nitrogen in denitrification process, namely there occurs short-cut denitrification phenomenon.
Anaerobic ammonium oxidation process is without oxygen and organic carbon source when, using ammonia nitrogen as electron acceptor, nitrite nitrogen is reduced to nitrogen, finally realizes autotrophic denitrification. If be combined with Anammox by above-mentioned short-cut denitrification, then can reduce the biological denitrificaion demand to organic carbon source. Therefore, exploitation short-cut denitrification Anammox denitrogenation technology is expected to provide solution for low C/N wastewater efficient denitrogenation, can meet the objective of low-carbon economy and qualified discharge simultaneously.
Summary of the invention
The purpose of the present invention is aiming at the problem that low C/N bio-denitrifying sewage carbon source is not enough, it is proposed to the apparatus and method of a kind of A/O biomembrane denitrogenation processing low C/N sewage.
The technical scheme is that the device providing a kind of A/O biomembrane denitrogenation processing low C/N sewage: be provided with former water tank 1, A section biofilm reactor 2, O section biofilm reactor 3; Former water tank 1 is provided with overflow pipe 1.1 and blow-down pipe 1.2; Former water tank 1 is connected with A section biofilm reactor water intaking valve 2.2 by intake pump 2.1;A section biofilm reactor 2 is cylindrical, is divided into hypomere and epimere two parts according to water (flow) direction, and hypomere is short-cut denitrification biomembrane 2.5, and epimere is Anammox biomembrane 2.6; A section biofilm reactor outlet pipe 2.8 is connected with O section biofilm reactor 3 by O section biofilm reactor water intaking valve 3.2, O section biofilm reactor 3 is cylindrical, fill nitrated biomembrane, nitrification liquid internal reflux pump 3.1 is connected with A section biofilm reactor 2 by nitrification liquid internal reflux valve 2.3, and final outflow water is discharged by O section biofilm reactor outlet pipe 3.4.
The A/O biomembrane denitrogenation method of the low C/N sewage of process provided by the invention, comprises the following steps: the step of method is:
1) system is started: inoculation has short-cut denitrification biomembrane, is added to A section biofilm reactor bottom, and its volume accounts for the 20-40% of whole A section biofilm reactor reaction zone volume; Inoculation Anammox biomembrane is added to A section biofilm reactor top, and its volume accounts for the 40-80% of whole A section biofilm reactor reaction zone volume; Inoculating nitrated biomembrane, be added to O section biofilm reactor, its volume accounts for the 80-100% of whole O section biofilm reactor reaction zone volume.
2) operation is regulated when running as follows:
2.1) A section biofilm reactor hydraulic detention time is 2-6h, O section biofilm reactor hydraulic detention time is 0.5-3h;
2.2) in O section biofilm reactor, dissolved oxygen concentration is 0.5-1.5mg/L;
2.3) nitrification liquid internal reflux ratio is 200-400%, when system effluent nitrate-nitrogen concentration is more than 15mg/L, improves nitrification liquid internal reflux ratio, when system effluent nitrate-nitrogen concentration is less than 8mg/L, reduces nitrification liquid internal reflux ratio.
Know-why:
Low C/N sewage handling process in this device is: first make low C/N sewage enter the short-cut denitrification biomembrane of A section biofilm reactor hypomere, denitrifying bacterium on this biomembrane utilizes the organic carbon source in former water, is nitrite nitrogen by the nitrate-nitrogen reduction of backflow nitrification liquid. When then passing through the Anammox biomembrane of epimere, part ammonia nitrogen and nitrite nitrogen in sewage are converted into nitrogen by the anaerobic ammonia oxidizing bacteria on biomembrane. The water outlet of A section biofilm reactor is again introduced into O section biofilm reactor, and in sewage water, remaining ammonia nitrogen is nitrate nitrogen by the oxidation by nitrobacteria on biomembrane, and low C/N wastewater efficient denitrogenation is flowed in final realization continuously, reduces sewage disposal expense.
The present invention provides nitrite enhanced sewage Anammox autotrophic denitrification based on denitrification, has the advantage that compared with traditional biological denitrification process
1) owing to the ammonia nitrogen part in sewage is removed by Anammox, so only having remainder ammonia nitrogen to need aerobic nitrification, system operation energy consumption is saved.
2) end-product of short-cut denitrification is nitrite nitrogen, it is to avoid nitrite nitrogen is converted into the approach of nitrogen, shortens denitrification process, therefore can reduce the organic carbon source amount that denitrification consumes.
3) this biofilm reactor is cylindrical reactor so that floor space reduces.
4) biofilm reactor Biomass is high, and load is high, and sludge output is low, can reduce sludge treatment expense.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of A/O biomembrane denitrogenation installation method processing low C/N sewage of the present invention.
In figure, 1 is former water tank; 2 is A section biofilm reactor; 3 is O section biofilm reactor; 1.1 is former water tank overflow pipe; 1.2 is former water tank blow-down pipe;2.1 is A section biofilm reactor intake pump; 2.2 is A section reactor water intaking valve; 2.3 is nitrification liquid internal reflux valve; 2.4 is sample tap; 2.5 is short-cut denitrification biomembrane; 2.6 Anammox biomembranes; 2.7 is three phase separator; 2.8 is A section biofilm reactor outlet pipe; 3.1 is nitrification liquid internal reflux pump; 3.2 is O section biofilm reactor water intaking valve; 3.3 is nitrated biomembrane; 3.4 is O section biofilm reactor outlet pipe.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention will be further described: as it is shown in figure 1, the A/O biomembrane denitrogenation device processing low C/N sewage is provided with former water tank 1, A section biofilm reactor 2, O section biofilm reactor 3; Former water tank 1 is provided with overflow pipe 1.1 and blow-down pipe 1.2; Former water tank 1 is connected with water intaking valve 2.2 by intake pump 2.1; A section biofilm reactor 2 is cylindrical, is divided into hypomere and epimere two parts according to water (flow) direction, and hypomere adds short-cut denitrification biomembrane 2.5, and epimere adds Anammox biomembrane 2.6; A section biofilm reactor outlet pipe 2.8 is connected with O section biofilm reactor 3 by O section biofilm reactor water intaking valve 3.2, O section biofilm reactor 3 is cylindrical, add nitrated biomembrane, nitrification liquid internal reflux pump 3.1 is connected with A section biofilm reactor 2 by nitrification liquid internal reflux valve 2.3, and final outflow water is discharged by O section biofilm reactor outlet pipe 3.4.
Test adopts artificial distribution as former water, and concrete water quality is as follows: COD concentration is 55-190mg/L, average out to 130mg/L;Concentration is 40-93mg/L, average out to 50mg/L;Pilot system is as it is shown in figure 1, each reactor all adopts lucite to make, and A section biofilm reactor and O section biofilm reactor volume are 3L.
Carrying out practically operation is as follows:
1) system is started: inoculation has the short-cut denitrification biomembrane of excellent activity, is added to A section biofilm reactor bottom, and its volume accounts for the 40% of whole A section biofilm reactor reaction zone volume; Inoculation has the Anammox biomembrane of excellent activity and is added to A section biofilm reactor top, and its volume accounts for the 60% of whole A section biofilm reactor reaction zone volume; Inoculation has the biomembrane of good nitrification activity, is added to O section biofilm reactor, and its volume accounts for the 100% of whole O section biofilm reactor reaction zone volume.
2) operation is regulated when running as follows:
2.1) A section biofilm reactor hydraulic detention time is 3h, O section biofilm reactor hydraulic detention time is 3h;
2.2) in O section biofilm reactor, dissolved oxygen concentration is 1.5mg/L;
2.3) nitrification liquid internal reflux ratio is 200-300%, when system effluent nitrate-nitrogen concentration is more than 15mg/L, improves nitrification liquid internal reflux ratio, when system effluent nitrate-nitrogen concentration is less than 8mg/L, reduces nitrification liquid internal reflux ratio.
Result of the test shows: after stable, and system effluent COD concentration is 25-90mg/L, average out to 50.3mg/L;Concentration 0-3mg/L, average out to 1.4mg/L;Concentration is 0-1mg/L, average out to 0.2mg/L; Concentration 0-16mg/L, average out to 10.2mg/L.

Claims (2)

1. the A/O biomembrane denitrogenation device processing low C/N sewage, it is characterised in that: it is provided with former water tank (1), A section biofilm reactor (2), O section biofilm reactor (3); Former water tank (1) is provided with overflow pipe (1.1) and blow-down pipe (1.2); Former water tank (1) is connected with water intaking valve (2.2) by intake pump (2.1);A section biofilm reactor (2) is cylindrical, is divided into hypomere and epimere two parts according to water (flow) direction, and hypomere adds short-cut denitrification biomembrane (2.5), and epimere adds Anammox biomembrane (2.6); A section biofilm reactor outlet pipe (2.8) is connected by O section biofilm reactor water intaking valve (3.2) and O section biofilm reactor (3); O section biofilm reactor (3) is cylindrical, adds nitrated biomembrane; Nitrification liquid internal reflux pump (3.1) is connected with A section biofilm reactor (2) by nitrification liquid internal reflux valve (2.3), and final outflow water is by O section biofilm reactor outlet pipe (3.4) discharge.
2. applying the method that device as claimed in claim 1 realizes low C/N wastewater efficient denitrogenation, its feature includes herein below:
1) system is started: inoculation has short-cut denitrification biomembrane, is added to A section biofilm reactor bottom, and its volume accounts for the 20-40% of whole A section biofilm reactor reaction zone volume; Inoculation Anammox biomembrane is added to A section biofilm reactor top, and its volume accounts for the 40-80% of whole A section biofilm reactor reaction zone volume; Inoculating nitrated biomembrane, be added to O section biofilm reactor, its volume accounts for the 80-100% of whole O section biofilm reactor reaction zone volume;
2) operation is regulated when running as follows:
2.1) A section biofilm reactor hydraulic detention time is 2-6h, O section biofilm reactor hydraulic detention time is 0.5-3h;
2.2) in O section biofilm reactor, dissolved oxygen concentration is 0.5-1.5mg/L;
2.3) nitrification liquid internal reflux ratio is 200-400%, when system effluent nitrate-nitrogen concentration is more than 15mg/L, improves nitrification liquid internal reflux ratio, when system effluent nitrate-nitrogen concentration is less than 8mg/L, reduces nitrification liquid internal reflux ratio.
CN201610238027.3A 2016-04-17 2016-04-17 A kind of A/O biomembrane denitrogenation device and method handling low C/N sewage Active CN105668794B (en)

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CN110577284A (en) * 2019-10-12 2019-12-17 伏小勇 Sequencing batch type carbon neutralization tide biological contact oxidation reactor

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CN110577284A (en) * 2019-10-12 2019-12-17 伏小勇 Sequencing batch type carbon neutralization tide biological contact oxidation reactor

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