CN102153192B

CN102153192B - Reinforced aerobic granular sludge culture method

Info

Publication number: CN102153192B
Application number: CN2011101214733A
Authority: CN
Inventors: 王新华; 刁目贺; 王曙光; 石义静; 高明明; 杨英
Original assignee: Shandong University
Current assignee: Shandong University
Priority date: 2011-05-11
Filing date: 2011-05-11
Publication date: 2012-07-04
Anticipated expiration: 2031-05-11
Also published as: CN102153192A

Abstract

The invention discloses a reinforced aerobic granular sludge culture method, and belongs to the field of sewage treatment. The method comprises the following steps of: arranging symmetrical permanent magnets at the outer side of the bottom of a sequencing batch airlift reactor (SBAR), so that stable static magnetic fields are generated in the reactor; simultaneously adding flocculent aerobic active sludge serving as seed sludge into the SBAR, and performing aerobic granular sludge culture; and operating the SBAR in a mode of water inlet, aeration, settlement and drainage. By the method, the formation of the aerobic granular sludge can be accelerated, the complete granulation time of the flocculent active sludge is shortened to 3 to 4 weeks, and the problem of overlong culture time of the conventional aerobic granular sludge is solved. The aerobic granular sludge obtained by the method has good stability, and the chemical oxygen demand (COD) and the ammonia nitrogen removal effect can be remarkably improved.

Description

A kind of reinforced aerobic granule sludge cultural method

One, technical field

The invention belongs to environment protection, sewage treatment area.Be specifically related to a kind of applying a magnetic field promotes that aerobic particle mud forms in the gas stripping type batch reactor method.

Two, background technology

Microbe granularization is a kind of phenomenon that cell mutually combines through biology, physics and chemical effect; Be meant under specific processing condition; Interact between mikrobe in the reactor drum and carrier or the mikrobe and form big and closely knit granular mud aggregate, mainly constitute by microorganism cells, extracellular polymeric, inorganic salt and other settling.Mikrobe is a kind of compact grain that is formed by different strain through the biological particles that self coagulation forms, and these different strains are being brought into play different effects in the waste water of degraded complicated component.Active sludge with traditional is compared, and the principal character of granule sludge has the following aspects:

(1) outward appearance is rule, slick ball property or sphaeroid, and sharpness of border has densification, tough structure, is difficult for because of current are sheared, the pressure fragmentation of inner aerogenesis causes sludge loss;

(2) have good settling property, make to promote to handle increasing and the improvement of treatment effect and the raising of solid-liquid separation effect of the water yield thus by the mud that to hold back higher concentration in the system;

(3) have fine and close structure and bigger particle diameter,, therefore have higher tolerance for impact load and toxic organic compound matter and heavy metal because the existence of mass transfer limit can be kept a comparatively stabile microenvironment in granule interior;

(4) has the ability of degraded difficult degradation pollution substance; The degraded fully of difficult degradation pollution substance relates to the interaction of multiple flora; And granule sludge is the microecosystem of multiple mikrobe coexistence, and therefore a large amount of pollution substances can obtain handling in the system of compactness.

According to the difference of electron acceptor(EA) in the metabolic process, can be divided into anaerobic grain sludge and aerobic particle mud again.Aerobic granular is a kind of special shape of biofilm development, and it is cell self immobilization particle of mikrobe spontaneous formation under aerobic condition.With the anaerobic grain sludge compared with techniques, the aerobic particle mud technology has special advantages: system is short start time; There is not strict operational temperature limitation; Process range is wide; Has the denitrogenation dephosphorizing ability.

But, also there are some shortcomings in aerobic particle mud, and is long such as difficult formation of aerobic particle mud and formation time, and what have reaches up to a hundred days; These shortcomings have seriously limited the application of aerobic particle mud in reality.

Three, summary of the invention

The objective of the invention is to solve the long problem of incubation time of aerobic particle mud, a kind of method of utilizing magnetic field to promote the formation of granule sludge is provided.

1. the cultural method of reinforced aerobic granule sludge of the present invention is following:

In gas stripping type batch reactor bottom outside symmetric permanent magnet is installed, is utilized permanent magnet to produce the stable static magnetic field of 40.0～65.0mT; Getting cotton-shaped aerobic activated sludge is seeded in the gas stripping type batch reactor; The preparation simulated wastewater, COD in the waste water _CrConcentration is 300～500mg/L, and ammonia nitrogen concentration is 100～400mg/L, and adds nutritive element and trace element assurance microbial growth in right amount, and pH is 7.5～8.5; The gas stripping type batch reactor moves by the mode of water inlet aeration sedimentation draining, and the cycle of operation is 4～6h, wherein flooding time 10～15min, aeration time 210～345min, settling time 3～10min, water outlet time 2～5min; Adopt air aeration, aeration rate is 0.10～0.20m ³/ h, dissolved oxygen concentration is at 5.0～9.0mg/L; The gas stripping type batch reactor moves at room temperature condition; In gas stripping type batch reactor 2～3 weeks of operation, begin to form aerobic particle mud, and realize prilling fully in 3～4 weeks.And the incubation time of general aerobic particle mud needs 60～80 days, so the present invention accelerated the granular process of aerobic sludge, has solved aerobic particle mud and has been difficult for forming and the long problem of formation time.The aerobic particle mud that the present invention turns out is faint yellow, and diameter is 1.0～2.0mm, and subsidence rate is 30～50m/h, and SVI (SVI) is 20～30mL/g; Mikrobe in the aerobic particle mud is main with coccus, comprises some tyrothricin; Granule sludge compact construction, stability are good.

Four, description of drawings

Fig. 1 is the gas stripping type batch reactor structural representation that uses in the embodiment of the invention;

Among the figure: 1 is inlet chest; 2 is peristaltic pump; 3 is aeration head; 4 is air pump; 5 are the gas dosing meter; 6 is SV; 7 is the dual-time rly.; 8 is liquidometer; 9 is interior pipe; 10 is water tank; 11 is outer tube; 12 is permanent magnet.

Five, embodiment

Below in conjunction with embodiment the present invention is explained further details.

Embodiment

Adopt the gas stripping type batch reactor, (25cm * 100cm * 150cm), two magnet produce the steady stability magnetic field of 48.0mT at a distance of 10cm in the exterior bottom of gas stripping type batch reactor two block permanent magnets to be installed.

The gas stripping type batch reactor is made up of interior pipe 9, outer tube 11, useful volume 3.5L, and outer tube diameter 10.0cm, high 100cm, interior pipe 9 diameter 7.0cm, high 70cm, interior pipe 9 and outer tube 11 are at a distance of 2cm.The micro porous aeration head 3 that air is installed through reactor bottom central authorities by air pump 4 gets into reactor drum; Liquid and granule sludge move upward in interior pipe 9 in the air-flow driving a reaction device that forms; Between inside and outside tube wall, move downward then; Behind reactor bottom, moved upward by the air-flow traction once more, mixed solution can circulate between inside and outside tube wall and uniform mixing like this.In the reactor bottom water inlet, water port is at the high 50cm of reactor drum place through peristaltic pump 2, and by the break-make of SV 6 control water port, the volume-exchange rate is 50%.The water inlet of reactor drum, aeration, sedimentation and water discharge time are controlled by dual-time rly. 7 and liquidometer 8 automatically.Water inlet finishes, and water level reaches 85cm in the post-reactor, and reactor drum moves according to the mode of aeration sedimentation draining automatically then.Be 6h cycling time, and water inlet 12min, aeration 336min, sedimentation 9min, water outlet 3min moves after 20 days, aeration time increased to 342min, settling time be kept to 3min, and purpose is to get rid of the mud of settling property difference, quickens particulate formation.Move four cycles every day.The aeration rate of reactor drum is 0.10m ³/ h, increasing after 25 days is 0.20m ³/ h, reactor drum at room temperature moves.The cotton-shaped aerobic activated sludge of 1L is seeded in the gas stripping type batch reactor, and initial sludge concentration (MLSS) is 3.6g/L in the reactor drum; COD _CrConstant concentration is 500mg/L, and ammonia nitrogen concentration is progressively brought up to 400mg/L by 100mg/L, adds an amount of nutritive element: MgSO47H ₂O, 25mg/L; FeSO ₄, 20mg/L; CaCl ₂, 80mg/L; KH ₂PO ₄, 22mg/L; FeCl ₃6H ₂O, 1.5mg/L; EDTA, 20mg/L and trace element: H ₃BO ₃, 0.15mg/L; ZnCl ₂, 0.12mg/L; KI, 0.03mg/L; CuSO ₄5H ₂O, 0.03mg/L; NaMoO ₄2H ₂O, 0.15mg/L; CoCl ₂6H ₂O, 0.058mg/L; MnCl ₂4H ₂O, 0.12mg/L; Na ₂MoO ₄4H ₂O, 0.15mg/L, the normal growth of assurance mikrobe.Water inlet pH is regulated by sodium hydrogencarbonate, remains in 7.5～8.5 scopes.

Through 18 days cultivation, begin to occur aerobic particle mud in the gas stripping type batch reactor, to the 25th day; Cotton-shaped aerobic activated sludge has all become the xanchromatic aerobic particle mud; Particle diameter is at 0.5～1.0mm, and mixed liquor suspended solid, MLSS concentration (MLSS) is 6.2g/L, sludge volume index (SVI ₃₀) be 23mL/g.Gas stripping type batch reactor water outlet COD _CrConcentration is 40～65mg/L, and the water outlet ammonia nitrogen concentration is 0～5.0mg/L, COD _CrClearance is 87%～92%, and ammonia nitrogen removal frank is 97.5%～100%, and the aerobic particle mud handling property that is obtained is very superior.

Claims

1. a reinforced aerobic granule sludge cultural method is characterized in that said method comprises the steps:

(1) in gas stripping type batch reactor bottom outside symmetric permanent magnet is installed, is utilized permanent magnet to produce the stable static magnetic field of 40.0～65.0mT;

(2) getting cotton-shaped aerobic activated sludge is seeded in the gas stripping type batch reactor;

(3) preparation simulated wastewater, COD in the waste water _CrConcentration is 300～500mg/L, and ammonia nitrogen concentration is 100～400mg/L, and adds nutritive element and trace element assurance microbial growth in right amount, and pH is 7.5～8.5;

(4) the gas stripping type batch reactor moves by the mode of water inlet-aeration-sedimentation-draining, and the cycle of operation is 4～6h, wherein flooding time 10～15min, aeration time 210～345min, settling time 3～10min, water outlet time 2～5min; Adopt air aeration, aeration rate is 0.10～0.20m ³/ h, dissolved oxygen concentration is at 5.0～9.0mg/L; The gas stripping type batch reactor moves at room temperature condition;

(5) in gas stripping type batch reactor 2～3 weeks of operation, begin to form aerobic particle mud, and realize prilling fully in 3～4 weeks.