CN105668794B - A kind of A/O biomembrane denitrogenation device and method handling low C/N sewage - Google Patents

A kind of A/O biomembrane denitrogenation device and method handling low C/N sewage Download PDF

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CN105668794B
CN105668794B CN201610238027.3A CN201610238027A CN105668794B CN 105668794 B CN105668794 B CN 105668794B CN 201610238027 A CN201610238027 A CN 201610238027A CN 105668794 B CN105668794 B CN 105668794B
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biomembrane
biofilm
sewage
biofilm reactor
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CN105668794A (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 a kind of A/O biomembrane denitrogenation device and method of the low C/N sewage of processing.Described device includes:Raw water water tank, intake pump, A section biofilm reactor, O sections of biofilm reactors, reflux pump in nitrification liquid.Raw water water tank is a closed box, is equipped with overflow pipe and blow-down pipe;A sections of biofilm reactors are cylindrical, are divided into hypomere and epimere two parts according to water (flow) direction, hypomere is short-cut denitrification biomembrane, and epimere is Anammox biomembrane;O sections of biofilm reactors are cylindrical, filling nitrification biomembrane.The method is that A sections of biofilm reactor hypomeres realize short-cut denitrification, and using the organic carbon source in sewage, the nitrate-nitrogen reduction that nitrification liquid carries that will flow back is nitrite nitrogen;Epimere biomembrane realizes Anammox, converts the nitrite nitrogen of part ammonia nitrogen and short-cut denitrification accumulation in sewage to nitrogen;Remaining ammonium oxidation in sewage is nitrate nitrogen by O sections of biofilm reactors, realizes the efficient denitrification of low C/N sewage.

Description

A kind of A/O biomembrane denitrogenation device and method handling low C/N sewage
Technical field
The present invention relates to a kind of A/O biomembrane denitrogenation device and method of the low C/N sewage of processing, belong to Sewage Biological Treatment Technical field.
Background technology
Bio-denitrifying sewage mostly uses greatly traditional biological nitrification and denitrification denitrogenation technology at present, and is needed in denitrification process It wants organic carbon source as electron donor, nitrogen oxides is reduced to nitrogen.Therefore the insufficient low C/N sewage containing organic carbon source is difficult to Efficient denitrification needs to add outer carbon source to improve denitrification effect, for qualified discharge to increase sewage disposal expense.
Traditional biological denitrification process is the nitrate-nitrogen reduction enzyme for passing sequentially through denitrification strain, nitrite nitrogen reduction Nitrate-nitrogen reduction is gradually nitrogen by enzyme, nitric oxidereductase and nitrous oxide reduction enzyme effect.It recent studies have shown 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, Lead to the accumulation for occurring nitrite nitrogen in denitrification process, that is, short-cut denitrification phenomenon has occurred.
Anaerobic ammonium oxidation process is under conditions of without aerobic and organic carbon source, using ammonia nitrogen as electron acceptor, by nitrous State nitrogen is reduced to nitrogen, finally realizes autotrophic denitrification.If above-mentioned short-cut denitrification combined with Anammox, can reduce Demand of the biological denitrificaion to organic carbon source.Therefore, exploitation short-cut denitrification Anammox denitrogenation technology is expected to as low C/N sewage Efficient denitrification provides solution, while can meet the objective of low-carbon economy and qualified discharge.
Invention content
The purpose of the present invention is aiming at the problem of low C/N bio-denitrifying sewages carbon source deficiency, a kind of low C/N of processing of proposition The apparatus and method of the A/O biomembrane denitrogenations of sewage.
The technical scheme is that:Provide a kind of device for the A/O biomembrane denitrogenations handling low C/N sewage:It is equipped with Raw water water tank 1, A section biofilm reactor 2, O sections of biofilm reactors 3;Raw water water tank 1 is equipped with overflow pipe 1.1 and blow-down pipe 1.2;Raw water water tank 1 is connected by intake pump 2.1 with A sections of biofilm reactor inlet valves 2.2;A sections of biofilm reactors 2 are in Cylindricality 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 anaerobism ammonia Oxidative biological film 2.6;A sections of biofilm reactor outlet pipes 2.8 pass through O sections of biofilm reactor inlet valves 3.2 and O sections of biomembranes Reactor 3 connects, and O sections of biofilm reactors 3 are cylindrical, filling nitrification biomembrane, and reflux pump 3.1 passes through nitrification liquid in nitrification liquid Interior return valve 2.3 is connect with A sections of biofilm reactors 2, and final outflow water is discharged by O sections of biofilm reactor outlet pipes 3.4.
The A/O biomembrane denitrogenation methods provided by the invention for handling low C/N sewage, include the following steps:The step of method For:
1) activation system:Inoculation has short-cut denitrification biomembrane, is added to A sections of biofilm reactor lower parts, volume Account for the 20-40% of entire A sections of biofilm reactor reaction zone volume;Inoculation Anammox biomembrane is added to A sections of biomembranes Reactor top, volume account for the 40-80% of entire A sections of biofilm reactor reaction zone volume;Inoculation nitrification biomembrane, adds To O sections of biofilm reactors, volume accounts for the 80-100% of entire O sections of biofilm reactor reaction zone volume.
2) it is as follows that operation is adjusted when running:
2.1) A sections of biofilm reactor hydraulic detention times are 2-6h, and O sections of biofilm reactor hydraulic detention times are 0.5-3h;
2.2) dissolved oxygen concentration is 0.5-1.5mg/L in O sections of biofilm reactors;
2.3) nitrification liquid internal reflux ratio is 200-400%, when system effluent nitrate-nitrogen concentration is more than 15mg/L, improves nitre Change liquid internal reflux ratio, when system effluent nitrate-nitrogen concentration is less than 8mg/L, reduces nitrification liquid internal reflux ratio.
Technical principle:
The process flow of low C/N sewage in this device is:Low C/N sewage is set to enter under A sections of biofilm reactors first The short-cut denitrification biomembrane of section, the denitrifying bacterium on the biomembrane is using the organic carbon source in raw water, by the nitrification liquid that flows back Nitrate-nitrogen reduction is nitrite nitrogen.When then by the Anammox biomembrane of epimere, part ammonia nitrogen and nitrous in sewage State nitrogen is converted into nitrogen by the anaerobic ammonia oxidizing bacteria on biomembrane.The water outlet of A sections of biofilm reactors is again introduced into O sections of biomembranes Reactor, remaining ammonia nitrogen is nitrate nitrogen by the oxidation by nitrobacteria on biomembrane in sewage water, final to realize that the low C/N of continuous flow is dirty Water efficient denitrification reduces sewage disposal expense.
The present invention is based on denitrifications to provide nitrite enhanced sewage Anammox autotrophic denitrification, with traditional biological denitrogenation Technique is compared and is had the advantage that:
1) since the ammonia nitrogen part in sewage is removed by Anammox, so only remainder ammonia nitrogen needs are aerobic Nitrification, saves system operation energy consumption.
2) final product of short-cut denitrification is nitrite nitrogen, avoids the approach that nitrite nitrogen is converted into nitrogen, shortens Denitrification process, therefore the organic carbon source amount of denitrification consumption can be reduced.
3) 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.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of the A/O biomembrane denitrogenation installation methods of the low C/N sewage of processing of the present invention.
In figure, 1 is raw water water tank;2 be A sections of biofilm reactors;3 be O sections of biofilm reactors;1.1 be raw water water tank Overflow pipe;1.2 being raw water water tank blow-down pipe;2.1 be A sections of biofilm reactor intake pumps;2.2 be A sections of reactor inlet valves; 2.3 be return valve in nitrification liquid;2.4 be sample tap;2.5 be short-cut denitrification biomembrane;2.6 Anammox biomembranes;2.7 For three phase separator;2.8 be A sections of biofilm reactor outlet pipes;3.1 be reflux pump in nitrification liquid;3.2 is anti-for O sections of biomembranes Answer device inlet valve;3.3 be nitrification biomembrane;3.4 be O sections of biofilm reactor outlet pipes.
Specific implementation mode
The present invention will be further described with reference to the accompanying drawings and examples:As shown in Figure 1, handling the A/O of low C/N sewage Biomembrane denitrogenation device is equipped with raw water water tank 1, A sections of biofilm reactors 2, O sections of biofilm reactors 3;Raw water water tank 1, which is equipped with, to overflow Flow tube 1.1 and blow-down pipe 1.2;Raw water water tank 1 is connected by intake pump 2.1 with inlet valve 2.2;A sections of biofilm reactors 2 are in Cylindricality is divided into hypomere and epimere two parts according to water (flow) direction, and hypomere adds short-cut denitrification biomembrane 2.5, and epimere addition is detested Anaerobic ammonium oxidation biomembrane 2.6;A sections of biofilm reactor outlet pipes 2.8 are raw with O sections by O sections of biofilm reactor inlet valves 3.2 Object membrane reactor 3 connects, and O sections of biofilm reactors 3 are cylindrical, addition nitrification biomembrane, and reflux pump 3.1 passes through nitre in nitrification liquid Change return valve 2.3 in liquid to connect with A sections of biofilm reactors 2, final outflow water passes through O sections of 3.4 rows of biofilm reactor outlet pipe It puts.
Experiment adopts artificial distribution as raw water, and specific water quality is as follows:COD a concentration of 55-190mg/L, average out to 130mg/ L;A concentration of 40-93mg/L, average out to 50mg/L;Pilot system It is made as shown in Figure 1, each reactor is all made of organic glass, A sections of biofilm reactors and O sections of biofilm reactor volumes are 3L。
Carrying out practically operation is as follows:
1) activation system:It is inoculated with the short-cut denitrification biomembrane with excellent activity, is added under A sections of biofilm reactors Portion, volume account for the 40% of entire A sections of biofilm reactor reaction zone volume;The Anammox with excellent activity is inoculated with to give birth to Object film is added to A sections of biofilm reactor tops, and volume accounts for the 60% of entire A sections of biofilm reactor reaction zone volume;It connects Biomembrane of the kind with good nitrification activity, is added to O sections of biofilm reactors, volume accounts for entire O sections of biofilm reactor The 100% of reaction zone volume.
2) it is as follows that operation is adjusted when running:
2.1) A sections of biofilm reactor hydraulic detention times are 3h, O section biofilm reactor hydraulic detention times are 3h;
2.2) dissolved oxygen concentration is 1.5mg/L in O sections of biofilm reactors;
2.3) nitrification liquid internal reflux ratio is 200-300%, when system effluent nitrate-nitrogen concentration is more than 15mg/L, improves nitre Change liquid internal reflux ratio, when system effluent nitrate-nitrogen concentration is less than 8mg/L, reduces nitrification liquid internal reflux ratio.
Test result shows:After stable, system effluent COD concentration is 25-90mg/L, average out to 50.3mg/L;Concentration 0-3mg/L, average out to 1.4mg/L;A concentration of 0-1mg/L, average out to 0.2mg/L; Concentration 0-16mg/L, average out to 10.2mg/L.

Claims (5)

1. a kind of A/O biomembrane denitrogenation devices handling low C/N sewage, it is characterised in that:Equipped with raw water water tank (1), A sections of biologies Membrane reactor (2), O sections of biofilm reactors (3);Raw water water tank (1) is equipped with overflow pipe (1.1) and blow-down pipe (1.2);Raw water water Case (1) is connected by intake pump (2.1) with inlet valve (2.2);A sections of biofilm reactors (2) are cylindrical, according to water (flow) direction It is divided into hypomere and epimere two parts, hypomere adds short-cut denitrification biomembrane (2.5), and epimere adds Anammox biomembrane (2.6);A sections of biofilm reactor outlet pipes (2.8) pass through O sections of biofilm reactor inlet valves (3.2) and O sections of biomembrane reactions Device (3) connects;O sections of biofilm reactors (3) are cylindrical, addition nitrification biomembrane;Reflux pump (3.1) passes through nitrification in nitrification liquid Return valve (2.3) is connect with A sections of biofilm reactors (2) in liquid, and final outflow water passes through O sections of biofilm reactor outlet pipes (3.4) it discharges.
2. the method for realizing low C/N wastewater efficients denitrogenation using device as described in claim 1, feature includes the following contents:
1) activation system:Inoculation has short-cut denitrification biomembrane, is added to A sections of biofilm reactor lower parts, volume accounts for whole The 20-40% of a A sections of biofilm reactor reaction zone volume;Inoculation Anammox biomembrane is added to A sections of biomembrane reactions Device top, volume account for the 40-80% of entire A sections of biofilm reactor reaction zone volume;Inoculation nitrification biomembrane, is added to O Section biofilm reactor, volume account for the 80-100% of entire O sections of biofilm reactor reaction zone volume;
2) it is as follows that operation is adjusted when running:
2.1) A sections of biofilm reactor hydraulic detention times are 2-6h, and O sections of biofilm reactor hydraulic detention times are 0.5- 3h;
2.2) dissolved oxygen concentration is 0.5-1.5mg/L in O sections of biofilm reactors;
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 reduces nitrification liquid internal reflux ratio when system effluent nitrate-nitrogen concentration is less than 8mg/L.
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