CN1654366B

CN1654366B - Electrode biomembrane-SBR denitrification and dephosphorization equipment

Info

Publication number: CN1654366B
Application number: CN 200510032646
Authority: CN
Inventors: 周少奇
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2005-01-04
Filing date: 2005-01-04
Publication date: 2010-08-18
Anticipated expiration: 2025-01-04
Also published as: CN1654366A

Abstract

The present invention discloses one kind of electrode-biomembrane SBR denitrogenating and dephosphorizing apparatus. The apparatus include SBR reactor, and two graphite plates inserted into the SBR reactor and serving as both electrodes and membrane hanger. Current is led into the SBR reactor to produce electric field promoting SBR processing effect. On the basis of SBR technique, electrode system is introduced to constitute composite electrode-biomembrane, which degrades organic matter with the microbe in the SBR reactor, converts organic nitrogen into nitro nitrogen and realizes the absorption of excessive phosphorus. Meanwhile, hydrogen the micro electrolysis generates is utilized effectively by the denitrifying biomembrane on the cathode plate, and during the denitrification, the nitrate in sewage is reduced to reach the aim of synchronously denitrogenating and dephosphorizing.

Description

Electrode biomembrane-SBR denitrification and dephosphorization equipment

Technical field

The present invention relates to a kind of SBR denitrification and dephosphorization equipment, specifically is a kind of by introduce electric current in the sbr reactor device, with the electrode-SBR denitrification and dephosphorization equipment that promotes SBR art breading effect by electric field action.

Background technology

SBR is the abbreviation of sequencing batch active sludge (being sequencing batch reactor, Sequencing Batch Reactor).As far back as 1914, at first adopted this treatment system when Ardern and Locket invention activated sludge process, but develop rapidly along with industry and automated control technology, make the SBR method shine new vitality in conjunction with automatic monitoring technique, since the 1970's, become one of the important research focus in external biological sewage treatment field, the engineering practical application is also more and more, and China is also in having given bigger concern over nearly 10 years.Although the technology of SBR method occurs very early, use after the technology such as monitoring automatically one of the new technology that forms current biological sewage treatment field that jumps in recent years.

SBR technology is a kind of simple and easy, fast and the biological wastewater treatment technology of low consumption, and its main peculiar advantage is:

The main process equipment of SBR technology has only a sbr reactor device, compare with conventional activated sludge process, do not need to establish in addition second pond and mud refluxing unit, and need not equalizing tank generally speaking, in most cases can save preliminary sedimentation tank, flow process is simple, layout is compact so SBR technology has, save floor space, saves initial cost (saving more than 30% than conventional activated sludge process).In addition, characteristic, the sludge settling property that has the ideal plug flow reactor in time is good, shock-resistance is good, and the fluctuation of the influent quality water yield is had adaptability preferably, flexible operation etc.

The main drawback of SBR technology is: though certain denitrogenation dephosphorizing effect is arranged, but in anaerobism and idle stage, anti-nitration reaction effect less stable, particularly COD/N is than low waste water, often lacking enough organism and influence the denitrogenation dephosphorizing effect as electron donor in the denitrification stage. traditional method is to add certain carbon source (also need increase basicity sometimes) with the enhancing denitrification effect, but the engineering application facet generally exists economy and technical difficulty.

Summary of the invention

The objective of the invention is to shortcoming, provide a kind of by in the sbr reactor device, introducing electric current, by the electrolytic action generation hydrogen (H of water at the prior art existence ₂), with hydrogen (H ₂) replace organism (COD) to satisfy the energy requirement of denitrifying bacterium in the sbr reactor device as electron donor, to improve the electrode-SBR denitrification and dephosphorization equipment of treatment effect.The present invention utilizes the microbiological deterioration organism in the sbr reactor device, removing the organic while, organonitrogen is converted into nitrate, and the excessive absorption of realization phosphorus, the hydrogen that simultaneously little electrolysis produces is efficiently utilized by the denitrification biofilm on the negative plate, in denitrification process, the nitrate in the sewage is reduced, thereby reaches the purpose of synchronous denitrification dephosphorizing.

To achieve the above object of the invention, the present invention has taked following technical scheme:

Device of the present invention as shown in Figure 1, electrode biomembrane-SBR denitrification and dephosphorization equipment comprises the sbr reactor device, improvement is to be added with electric field action on sbr reactor device basis.

Described electric field action is both to be used for electrode by being arranged in the sbr reactor device, is used for the graphite cake electrode of biofilm again to produce.Graphite cake as anode and cathode is of a size of: long 10～30cm, wide 10～30cm, thick 0.5～3cm.The distance between plates of two cube electrode pole plates is 10～30cm.

The optimum parameter of electrode of the present invention-SBR technology is: water inlet 0.2～1.2h, anaerobism 0.8～3h, aeration 1～8h, anoxic 0.5～3h, precipitation 0.2～lh, draining 0.2～1.5h, idle 0.5～2h.Current density is 0.02～0.1mA/cm ²

Compared with the prior art, the present invention has following beneficial effect:

The present invention introduces electric field in the sbr reactor device, inspecting electrode-SBR method is to the removal effect of pollutent, and compares with the SBR method, and test-results is as follows:

Electrode of the present invention-SBR method all has very high removal effect to COD, TN, TP: the COD clearance reaches more than 92%, NH ₄ ⁺-N clearance reaches more than 92.7%, and the high energy of TP clearance reaches 80%, and by finding that with the contrast of SBR method electrode-SBR is demonstrating more excellent removal efficient aspect the denitrogenation dephosphorizing, under the suitable situation of current density, TN and TP improve 7% and 15% than SBR respectively.

Description of drawings

Fig. 1 is the structural representation of apparatus of the present invention;

Fig. 2 is that electrode of the present invention-sbr reactor device is to COD _GrThe removal effect synoptic diagram;

Fig. 3 is the removal effect synoptic diagram of electrode of the present invention-sbr reactor device to ammonia nitrogen;

Fig. 4 is the removal effect synoptic diagram of electrode of the present invention-sbr reactor device to TP;

Fig. 5 is a COD degradation process situation synoptic diagram in time among SBR and the electrode-sbr reactor device figure;

Fig. 6 is a N middle COD in time degradation process situation synoptic diagram in time in the sbr reactor device;

Fig. 7 is a N degradation process situation synoptic diagram in time in electrode-sbr reactor device;

Fig. 8 is a TP degradation process situation synoptic diagram in time in SBR and the electrode-sbr reactor device.

Embodiment

Come below in conjunction with Figure of description that the invention will be further described, but the present invention's scope required for protection is not limited to the scope described in the embodiment.

Device of the present invention as shown in Figure 1, comprise the sbr reactor device and in the sbr reactor device two graphite cakes that insert, graphite cake both had been used for electrode, was used for biofilm again, the size Selection of graphite cake is as follows:

Cathode-anode plate size: long 10～30cm, wide 10～30cm, thick 0.5～3cm;

Polar plate spacing: 10～30cm.

The selection of other equipment that this device is involved:

Adjustable D.C. regulated power supply, model: HC-708, input: 160V-240V; Output: 1.5V-12V;

Reometer, model 85C-A, range 0-200mA.

Choosing of the operating parameter of apparatus of the present invention:

According to the analysis in stages such as the test-results of above each operating mode and anaerobism, aeration, anoxic, the optimum parameter that draws electrode-SBR technology is an operating mode 3: water inlet 0.2～1.2h, anaerobism 0.8～3h, aeration 1～8h, anoxic 0.5～3h, precipitation 0.2～1h, draining 0.2～1.5h, idle 0.5～2h.Current density is 0.02～0.1mA/cm ²

Implementation result

1, the removal effect of pollutent

By accompanying

drawing

2,3,4 as can be seen, and the present invention has the good treatment effect to COD, ammonia nitrogen, TP, and wherein the COD clearance reaches more than 92%, and ammonia nitrogen water inlet is between 20～22.3mg/L the time, water outlet between 1～1.57mg/L, NH ₄ ⁺-N clearance reaches more than 92.7%.TP water inlet is between 3.1～3.74mg/L the time, and water outlet is between 0.7～1.05mg/L, and the high energy of clearance reaches 80%, and phosphor-removing effect of this explanation electrode-SBR is fine, and this is that simple SBR method is difficult to realize.

From Fig. 6, can significantly find out among Fig. 7, after simple SBR and electrode-SBR entire reaction end, both do not have clearly difference ammonia-N removal rate, and the clearance difference of total nitrogen is very obvious, under the suitable situation of electric current, the clearance of total nitrogen has increased by 7 percentage points, promptly brought up to 84.1% by 77.1% of simple SBR, removing mainly of ammonia nitrogen carried out at aeration phase, therefore the raising of total nitrogen removal effect has reflected that negative electrode microbial film denitrification can obtain denitrification effect preferably under little electrolytic condition, be that denitrifying bacterium has made full use of the hydrogen that electrochemical reaction separates out and carries out denitrification as electron donor, thereby the clearance that makes total nitrogen is than sbr reactor device height.The degraded of agitation phases nitrate nitrogen comprises that also denitrifying bacterium reduces a part of nitrate nitrogen through assimilation and is converted into ammonia nitrogen, synthetic in order to microbial cell, and nitrogen becomes the integral part of bacterial cell.

2, the cycle is removed rule

As accompanying drawing 5,6,7, shown in 8, by comparing SBR and electrode-sbr reactor device conditional curve, can find that COD degraded situation is more or less the same under two kinds of situations, but small amount of degradation occur at anaerobism, aeration and the anoxic stage COD of electrode biomembrane SBR, the microorganism hard-degraded substance that exists for that can be understood as little electrolytic condition has played certain effect.At aeration phase, the degradation curve of each water quality parameter is similar, and the degraded of ammonia nitrogen is mainly in aeration phase (nitrification and assimilation); Nitrate nitrogen is because the generation aeration phase curve of nitrification is in rising trend; Total nitrogen is subjected to the influence degraded of above-mentioned two aspects to present the slow phenomenon of falling behind the first prompt drop.

The most significant difference occurs in the change in concentration of the nitrate nitrogen and the total nitrogen of agitation phases between two kinds of SBR, and the downtrending of degradation curve has illustrated that electrode biomembrane has served as " catalyzer " effect in the denitrification stage of sbr reactor device.

By comparing, the denitrification effect in electrode biomembrane denitrification stage is very obvious as can be seen, electrode biomembrane is 64% by the nitrate nitrogen clearance in denitrification stage, and the nitrate nitrogen clearance of simple SBR by the denitrification stage is 52%, and the denitrification clearance of electrode biomembrane has exceeded 12 percentage points.

3, current density is to the influence of microorganism growth

The degree of treatment of waste water can be judged according to protobiont and miniature metazoal mechanics, along with sewage purification and self purification of water body degree increase, many high level microbes appear in corresponding meeting, in general, the precedence of appearance is: bacterium-vegetalitas Flagellata-amoeba (meat foot class)-animality flagellate-swimming sex pili worm, worms on a sucker-anchorage ciliate-wheel animalcule.The appearance of swimming sex pili worm indicates that active sludge is in to cultivate mid-term that detergent power begins to improve; The appearance of a large amount of anchorage ciliates (campanularian etc.) and a small amount of roaming worm, wheel animalcule indicates that active sludge is in the cultivation ripening stage, and organic content is lower, and effluent quality is good, the detergent power height.

Experiment is found, on the graphite electrode plate of electrode-sbr reactor device, cultivating domestication during one week, promptly begin to form tangible microbial film, and microbial film is not obvious on the graphite cake in the single sbr reactor device.During quiescent setting, electrode-sbr reactor device clarification is fast, and single sbr reactor device is then clarified slowly.

By carrying out microscopic examination, the result is as shown in the table to the protobiont growing state of two reactors in this test.

Table 1 electric current is to the influence of microorganism growth

	Electrode-SBR	SBR
	Electrode-SBR	SBR	Swimming sex pili worm	On a small quantity	More
Campanularian	A lot	Some	Swimming sex pili worm	On a small quantity	More
Campanularian	A lot	Some	Wheel animalcule	Some	On a small quantity
The roaming worm	On a small quantity	Seldom	Wheel animalcule	Some	On a small quantity

	Electrode-SBR	SBR
	Electrode-SBR	SBR	Supernatant liquor	Transparent	Muddy

We can find from table 1, wheel animalcule in electrode-sbr reactor device and campanularian be many in the specific activity sewage sludge reactor all, swimming sex pili worm then is more in the sbr reactor device, this reflects in electrode-sbr reactor device, the free bacterial number is less, organic content is lower, and water quality is better, and the effect in the sewage place is better; Active sludge in the sbr reactor device then is in to be cultivated mid-term, and effluent quality is relatively poor.

Find also that in experimentation little electric current has promoter action preferably to microbial growth, when current density is increased to a certain degree, then can restrain microbial growth.

Comprehensive above-mentioned experiment, the present invention introduces electric field in the sbr reactor device, and inspecting electrode-SBR method is to the removal effect of pollutent, and compares with the SBR method, and test-results is as follows:

Electrode-SBR method all has very high removal effect to COD, TN, TP.The COD clearance reaches more than 92%, the TN clearance reaches more than 92.7%, the high energy of TP clearance reaches 80%, by finding that with the contrast of SBR method electrode-SBR is demonstrating more excellent removal efficient aspect the denitrogenation dephosphorizing, under the suitable situation of current density, the TN of electrode SBR and TP clearance improve 7% and 15% than sbr reactor device respectively.

Claims

1. electrode biomembrane-SBR denitrification and dephosphorization equipment, comprise the sbr reactor device, it is characterized in that on sbr reactor device basis, being added with electric field action, described electric field action both is used for electrode by being arranged in the sbr reactor device, being used for two graphite cake electrodes of biofilm again produces, and is provided with whipping appts between two graphite cakes; Graphite cake as anode and cathode is of a size of: long 10～30cm, wide 10～30cm, thick 0.5～3cm, and the distance between plates of two cube electrode pole plates is 10～30cm.