CN1096424C

CN1096424C - Sewage treatment installation

Info

Publication number: CN1096424C
Application number: CN99110550A
Authority: CN
Inventors: 森泉雅贵
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 1998-08-07
Filing date: 1999-07-29
Publication date: 2002-12-18
Anticipated expiration: 2019-07-29
Also published as: TW475921B; JP2000051894A; KR100303234B1; CN1245779A; KR20000016909A

Abstract

To provide a sewage treatment apparatus capable of removing both of phosphoric acid and nitrogen. A sewage treatment apparatus D1 is equipped with a sewage housing tank 1, electrodes 2 and 3, a DC power supply 11 and a control part. The electrodes 2 and 3 comprise rectangular iron plates to elute iron ions removing phosphoric acid in sewage by electrolysis. The lower half parts of the electrodes 2 and 3 are covered with carriers 9, 10 comprising porous reticulated members made of a polypropylene resin. The carriers 9 and 10 allow microorganisms participated in denitrification reaction to live in sewage. When the control part reverses the polarities of the electrodes 2 and 3, phosphoric acid is removed by the flocculation reaction of iron ions and phosphate ions in sewage on the side of the electrodes 2 and 3 becoming anodic in polarity. Further, on the side of the electrodes 2 and 3 becoming cathodic in polarity, nitrogen is removed by denitrification reaction based on the microorganisms on the carriers 9 and 10.

Description

Waste disposal plant

The present invention relates to waste disposal plant, more detailed it, relate to so that the sewage phosphoric acid that is contained in sanitary waste-water or sanitary wastewater etc. and the metal ion reaction of separating out and waste disposal plant that its precipitation is removed by electrolysis.

In the past, this kind waste disposal plant known have following shown in.

That is, be provided with the sewage accepting groove of the sewage of accommodating the desire processing, and configuration forms the electrode that metal constitutes by water-insoluble phosphoric acid salt more than one group in this groove, and supply with electric current between these electrodes, form metal ion in sewage and electrochemically separate out water-insoluble phosphoric acid salt, use the device that makes phosphoric acid become water-insoluble salt and precipitate removal.

In waste disposal plant so, make the water-insoluble phosphoric acid salt of separating out form the phosphate ion congealing reaction in metal ion and the sewage and can implement phosphoric acid and remove, but can cause the problem that to remove the nitrogen in the sewage by electrode.

In view of this, the present invention's purpose system provides waste disposal plant, and it can merge implements phosphoric acid removal and nitrogen removal.

According to the present invention, a kind of waste disposal plant is provided, comprising: the sewage accepting groove; At least one group of electrode is configured at least a portion and is dipped in the sewage that is accommodated in this sewage accepting groove, and separates out iron ion or the aluminum ion of removing the phosphoric acid in this sewage in order to precipitation by electrolysis; Power supply flow to these electrodes in order to supply with the electrolysis electricity consumption; And control part, in order to control this power supply; It is characterized in that: at least a portion of each electrode is covered by the carrier that the microorganism that participates in denitrification reaction in order to order in sewage perches; By making the reversal of poles of electrode termly, and become anodic electrode side, implement the removal of phosphoric acid, become the electrode side of negative electrode, implement the removal of the nitrogen that denitrification reaction carried out that is dependent on the microorganism on its carrier in polarity in polarity by control part.

The sewage accepting groove is accommodated the sewage that electrolysis is handled.Electrode is for the tabular thing of for example rectangle and dispose one group at least, by electrolysis iron ion or aluminum ion is separated out to the sewage accepting groove.The electric current that power supply supply electrolysis is used is to these electrodes.Control part is controlled electrolysis by the control power supply.

One group of electrode is for for example both constitute by one of iron or aluminium, or one be made of institute one of in iron and the aluminium, and another person is made of the water-insoluble metal.In the former occasion, according to need implementing the reversal of poles of electrode, thereby can prevent from can't help electrode separates out the passive stateization of ionic electrode.And in the latter's occasion, be used as anode, be used as negative electrode by the electrode that the water-insoluble metal is constituted by the electrode that is constituted one of in iron and the aluminium.

Wherein, for example be the electrode of silver or platinum etc. by the electrode that the water-insoluble metal constituted.Again, one group of electrode is preferably by electrical insulating property spacer with handle portion etc., and the interval that it is mutual remains in necessarily.

Separate out iron ion or the phosphoric acid in aluminum ion and the sewage (former phosphoric acid) reaction, and become water-insoluble phosphorus compound (Fe (OH) in the sewage accepting groove _x(PO ₄) _yOr Al (OH) _x(PO ₄) _y) and condense, and then be deposited in the sewage accepting groove.

Each electrode at least a portion (should be dipped in the part of sewage) is covered by carrier.This carrier is perched in order to the microorganism (for example as a kind of denitrifying bacteria of anerobe etc.) that order in sewage participates in denitrification reaction.

As long as the material of this carrier can be perched in order to the microorganism of order participation denitrification reaction in sewage, then be not particularly limited.For example can be constituted by the porous endoplasmic reticular body of plastics system, carbon fiber system or sintered ceramic system.

The bearer configuration precedent is hung down as the upper limb from each electrode, or mounting is in the bottom surface in order to the electrode box of accommodating one group of electrode, and at least a portion of each electrode that is covered.

Control part is for example with reverse the termly polarity of electrode of 30 minutes～10 days (being preferably 1 hour～7 days, more preferably 2 days～7 days) ratios once.So, become anodic electrode side, implement removal by the phosphoric acid that congealing reaction carried out of the phosphate ion in iron ion or aluminum ion and the sewage in polarity.Become the electrode side of negative electrode in polarity, implement the removal of the nitrogen that the denitrification reaction (nitrate ion in the sewage or nitrite ion are reduced into the reaction of nitrogen) that is dependent on the microorganism on its carrier caused.

According to waste disposal plant of the present invention, preferably also comprise in order to one group of electrode is separated into the dividing plate of anode side and cathode side between mutually and in order to each electrode is imposed the aerating apparatus of aeration.Control part is also controlled aerating apparatus, imposes aeration and only polarity is become the anodic electrode.

In the occasion that constitutes like this, only the electrode of antianode side imposes aeration by aerating apparatus, and promotes in the phosphoric acid of anode side to remove reaction, implements cleaning of this electrode simultaneously, on the one hand, the electrode of cathode side can be positioned under the reducing atmosphere.

Dividing plate for example uses pottery system or ion-exchange membrane system and only makes ion pass through this dividing plate and mobile, or do not make that plastics system that ion passes through and the below that makes ion pass through this dividing plate move etc.

Aerating apparatus for example have be located at the outer air feed of sewage accepting groove with fan, connect fan so far and the air-supply duct that extends in the groove and be connected to this air-supply duct and be disposed at the aeration tube of trench bottom.

According to waste disposal plant of the present invention, preferably also comprise in order to sewage is directed into the ingress pipe of sewage accepting groove; Dividing plate in the sewage accepting groove makes the sewage from ingress pipe flow into the sewage accepting groove via an end of dividing plate, then along one of dividing plate side or another side and be directed into the other end, walk around the other end then, along its another side or a side, and flow out via an end; Between ingress pipe and sewage accepting groove, also be provided with flow channel switching valve, in order to switch to from the sewage of ingress pipe in one of dividing plate side and the another side any one and guide it; Control part is more controlled flow channel switching valve, and sewage from ingress pipe is flowed into have polarity to become the side of dividing plate of the electrode of negative electrode.

In the occasion that constitutes like this, control part control flow channel switching valve at first makes sewage from ingress pipe flow into to have polarity to become the side of dividing plate of the electrode of anode.So, the sewage of inflow is walked around the other end of dividing plate thereafter, and advances towards the lateral direction of one of dividing plate with anode electrode.Therefore, after the fewer cathode side of dissolved oxygen concentration is implemented above-mentioned denitrification reaction fully,, can implement cleaning of above-mentioned congealing reaction and electrode in the anode side that the dissolved oxygen concentration by aeration rises.

Being simply described as follows of accompanying drawing:

Fig. 1 is by the structure explanatory view within the waste disposal plant of side observation the present invention's first embodiment;

Above serving as reasons, observes Fig. 2 the structure explanatory view of the waste disposal plant of Fig. 1;

Fig. 3 is as the electrode of the member of formation of the waste disposal plant of Fig. 1 and the stereographic map of carrier;

Fig. 4 is for being constructed explanatory view by the waste disposal plant of top view Fig. 1 by the amplification within the merging treatment and purification groove after organizing;

Fig. 5 is the exploded perspective view of the waste disposal plant of the present invention's second embodiment;

Fig. 6 is as the electrode of the member of formation of the waste disposal plant of Fig. 5 and the stereographic map of electrode box;

Fig. 7 is for being constructed explanatory view by the waste disposal plant of top view Fig. 5 by the amplification within the merging treatment and purification groove after organizing.

Below, with reference to description of drawings two embodiment of the present invention.And these are not in order to limit the present invention.First embodiment

As shown in Figures 1 and 2, the waste disposal plant D of the present invention's first embodiment ₁Have: a sewage accepting groove 1, two groups of

electrodes

2,3, in order to control this power supply 11 in order to supply with the direct supply 11 and the control part (not shown) of electric current to each

group electrode

2,3.

The case that sewage accepting groove 1 is roughly rectangle by planeform and has a conical bottom wall is constituted, and contains the sewage that desires such as sanitary waste-water or sanitary wastewater are handled.Be formed with in the top of one of sewage accepting groove 1 side wall and be connected in order to import the sewage introducing port 1a of sewage to the ingress pipe 4 of sewage accepting groove 1.

As shown in Figure 3, each

organizes electrode

2,3, and to be rectangle iron plate made, and separate out in order to remove the iron ion of the phosphoric acid in the sewage by electrolysis.Each organizes the electrical insulating property spacer 5 of

electrode

2,3 by the polyvinyl chloride (PVC) RESINS system that is installed on their upper ends, and it is remained in necessarily at interval.Be provided with handle portion 5a in spacer 5.

Upper end in

electrode

2,3 is provided with terminal for connecting 6.These terminals 6 are connected in junctor 8 by lead 7.Junctor 8 is connected on the above-mentioned power supply.

9,10 linings of the Lower Half of

electrode

2,3 carrier that hole endoplasmic reticular body is constituted more than acrylic resin system.These

carriers

9,10 hang down from the upper limb of each

electrode

2,3 by not shown rope, and the microorganism that participates in denitrification reaction is perched.

As shown in Figures 1 and 2, under two groups of

electrodes

2,3, flatly dispose the two piece aeration tubes 12,13 parallel with them.These aeration tubes 12,13 are waste disposal plant D ₁The part of aerating apparatus.That is this aerating apparatus has is located at the outer air feed of sewage accepting groove 1 with fan 14, connect fan 14 so far with valve 15 and two air-supply duct 16,17 of extending in the groove and be connected to these air-supply duct 16,17 and be disposed at the aeration tube 12,13 of trench bottom via the air feed switching.

Control part is with the reverse polarity of

electrode

2,3 of per five days ratios once.If the polarity of control

part counter-rotating electrode

2,3 then becomes

anodic electrode

2,3 sides in polarity, implement removal because of the phosphoric acid that congealing reaction caused of the phosphate ion in iron ion and the sewage.Again, become

electrode

2,3 sides of negative electrode, implement the removal of the nitrogen that the denitrification reaction (nitrate ion in the sewage or nitrite ion are reduced into the reaction of nitrogen) of the microorganism that is dependent on its

carrier

9,10 caused in polarity.

Waste disposal plant D ₁Also has rectangle dividing plate 18, in order to one group of

electrode

2,3 is separated into anode side and cathode side each other.Dividing plate 18 is the pottery system, and only makes ion move through this dividing plate 18.As shown in Figure 2, this dividing plate 18 makes the sewage from ingress pipe 4 flow into sewage accepting groove 1 via an end (ends of ingress pipe 4 sides) of dividing plate 18, then along a side of dividing plate 18 or another side and import the other end, then, walk around the other end, and along its another side or a side, and flow out via an end.

And between ingress pipe 4 and sewage accepting groove 1, be provided with flow channel switching valve 19.Flow channel switching valve 19 switches by control part, so that arbitrary in side of dividing plate 18 and the another side and guiding are from the sewage of ingress pipe 4.

Again, control part and then control flow channel switching valve 19 at first make sewage from ingress pipe 4 flow into to have polarity to become the side of dividing plate 18 of the

electrode

2,3 of negative electrode.

As shown in Figure 2, owing to adopt this structure, become negative electrode so will be positioned at the Polarity Control of the

electrode

3,3 of one of dividing plate 18 side, control flow channel switching valve 19 simultaneously, and as shown by arrows, sewage from ingress pipe 4 is at first flowed into have polarity to become side one side of dividing plate 18 of the

electrode

3,3 of negative electrode via the inflow road 19a of flow channel switching valve 19.So, the sewage that flows into is walked around the other end of dividing plate 18 thereafter, and advance towards a side of the another side (side with anode electrode 2,2) of dividing plate 18, and as shown by arrows, flow out from sewage accepting groove 1 via the outflow road 19b of the opposite side of flow channel switching valve 19.

Therefore, after the fewer cathode side of dissolved oxygen concentration is implemented above-mentioned denitrification reaction fully, can implement above-mentioned congealing reaction at the

anode electrode

2,2 that the dissolved oxygen concentration by aeration rises.And by flow out road 19b effusive sewage flow into the first following anaerobic filter bed groove 104.

Thereafter, if implement the polar counter-rotating by control part, interlock and switch flow channel switching valve 19 with it then has another side one side of dividing plate 18 that polarity becomes the

electrode

2,2 of negative electrode and flow into via flowing into road 19a from the sewage of ingress pipe 4.Thereafter, the sewage of inflow is walked around the other end of dividing plate 18, and advances towards the direction of the side (side with anode electrode 3,3) of dividing plate 18, is flowed out by sewage accepting groove 1 via the outflow road 19c of a side of flow channel switching valve 19.Again, in Fig. 1, symbol 20 is extracted valve for mud.The mud that is stranded in sewage accepting groove 1 is extracted valve 20 by open mud and is pulled out.The switch that this mud is extracted valve 20 is by control part or manually operate.

As shown in Figure 4, this waste disposal plant D ₁Group is gone into to small-sized merging treatment and purification groove 101.

Groove within the purification tank 101 is configured to discharge to outside Outlet Pipe 103 sides by inflow pipe 102 sides to the water with the sewage disposal end of the sewage of the mixing that flows into sanitary waste-water and sanitary wastewater, separates according to the order of sewage disposal and forms a plurality of grooves.

Symbol 104 is for separating the first anaerobic filter bed groove of the forefront that is formed at inflow pipe 102 sides.In this first anaerobic filter bed groove 104, will sneak in sanitary waste-water and sanitary wastewater and inclusion that can not purifying treatment gives precipitate and separate and removes.

Be provided with anaerobic filter bed 105 in the first anaerobic filter bed groove 104, and make microorganism perch, to implement anaerobic treatment in anaerobic filter bed 105 as the filter bed of anerobe.Anaerobic filter bed 105 is that the current when flowing into water or back washing waste water and temporarily flow into are rolled throw out, and becomes suspended solid, suppressing to flow out to a time groove, and then can reduce the load of a time groove.

Symbol 106 separates the second anaerobic filter bed groove of formation for being adjacent to the first anaerobic filter bed groove 104.In the second anaerobic filter bed groove 106, by perching anerobe, and implement anaerobic treatment in anaerobic filter bed 107.

Symbol 108 separates the biofilm filtration groove of formation for being adjacent to the second anaerobic filter bed groove 106.

The first anaerobic filter bed groove 104 and the second anaerobic filter bed groove 106 are separated by vertical next door 109.109 upper opening is formed with the advection mouth 110 that runs through next door 109 in the next door.And be embedded with advection pipe 111 in advection mouth 110.Advection pipe 111 its lower ends are positioned at the bottom of the anaerobic filter bed 105 of the first anaerobic filter bed groove 104, and the double as cleanout opening.

The second anaerobic filter bed groove 106 and biofilm filtration groove 108 are separated by vertical next door 112.112 upper opening is formed with the advection mouth 113 that runs through next door 112 in the next door.And be embedded with advection pipe 114 in advection mouth 113.From the sewage of the first anaerobic filter bed groove 104 advection to the second anaerobic filter bed groove 106 via advection pipe 111 with the stream that descends by behind the anaerobic filter bed 107, be admitted to biofilm filtration groove 108 via advection pipe 114.

By the anaerobic filter bed 107 of being located at the second anaerobic filter bed groove 106, and catch the SS of certain degree.The SS that is captured is anaerobic digestion and become dissolved matter gradually, or is used as mud and stores in the bottom of the second anaerobic filter bed groove 106.And in anaerobic filter bed 107, the nitrogen of organic property is by the nitrogen of anaerobic digestion ammonification.

Be provided with aerobic filter bed 115 in biofilm filtration groove 108 as the filter bed of aerobic microorganism, and by making the aerobic microorganism inhabit aerobic filter bed 115, and implement aerobic treatment.Near the bottom of biofilm filtration groove 108, the aeration tube 116 of aerating apparatus is arranged to be horizontally set with state configuration.Aerating apparatus is by from aeration tube 116 blow out air, and supplies with the aerobic microorganism of oxygen to the aerobic filter bed 115 that inhabits biofilm filtration groove 108.

Symbol 117 separates the processing tank of formation for being adjacent to biofilm filtration groove 108.In handling tank 117, carry out aerobic treatment with biofilm filtration groove 108, and leave standstill that the storage storage is filtered and treating water that advection is come.

Symbol 118 is formed at the disinfection trough of handling on the tank 117 for separating.Primary water above disinfection trough 118 is disinfected after processing tank 117 is handled, and be expelled to the outside by Outlet Pipe 103.

In biofilm filtration groove 108 and handle 117 of tanks and separate by vertical next door 119.119 upper opening is formed with the advection mouth 120 that runs through next door 119 in the next door.And be embedded with advection pipe 121 in advection mouth 120.From the second anaerobic filter bed groove 106 via advection pipe 114 advection to the sewage of biofilm filtration groove 108 with the stream that descends by behind the aerobic filter bed 115, deliver to via advection pipe 121 and to handle tank 117.

By the top of top to the first anaerobic filter bed groove 104 of handling tank 117, dispose in order to send the sending of returning in the treating water of top primary water to return pipe 122.Send and return pipe and 122 be connected waste disposal plant D ₁Ingress pipe 4 on.And return pipe 122 and be sent to waste disposal plant D via sending by primary water above riser pipe 123 picked up from handling tank 117 ₁, after implementing phosphorus removal and nitrogen removal, get back to the first anaerobic filter bed groove 104.Second embodiment

As shown in Figure 5, the waste disposal plant D of the present invention's second embodiment ₂Have: a sewage accepting groove 31, four groups of

electrodes

2,3, in order to supply with electric current to the direct supply 11 of each

group electrode

2,3, control part (not shown) and four electrode boxs 32 in order to control this power supply 11.

With at waste disposal plant D ₁In similarly, the Lower Half of

electrode

2,3 carrier that hole endoplasmic reticular body is constituted more than

acrylic resin system

9,10 lining.These

carrier

9,10 and waste disposal plant D ₁In difference, mounting is on the bottom surface of electrode box 32.

The case that sewage accepting groove 31 is roughly rectangle by planeform and has a diapire of taper is constituted, and contains the sewage that desires such as sanitary waste-water or sanitary wastewater are handled.Be formed with sewage introducing port 31a and outfall 31b in the top of one of sewage accepting groove 31 sidewall.And be provided with two root bottom part locating bars 35 of extension to left and right direction in the bottom of sewage accepting groove 31.Be provided with total six roots of sensation left and right sides locating bar 36 in the inboard of these bottom locating bars 35 towards longitudinal extension again.

As shown in Figure 6, electrode box 32 is that planeform is the box of rectangular case shape, and is acrylic resin system.The left and right sides wall of electrode box 32 constitutes in order to separate the mutual electrical insulating property dividing plate 32a of adjacent electrode box 32.The rear and front end of electrode box 32 forms and is rectangular effluent stream inlet 32b and sewage outfall 32c.

Again, the upper and lower surface of electrode box 32 stays circumference and the central gap rectangularity, and then forms electrode dismounting mouth 32d and aeration opening 32e respectively.And the left and right sides width of electrode box 32 (the mutual interval of face outside the two dividing plate 32a) equals the interior mutual interval of adjacent two left and right sides locating bars 36 of sewage accepting groove 31 substantially.And two circular port 32f on the electrode box 32 on the face are in order to be rotated with spacer 5 above electrode box 32 with screw.

So the electrode box 32 that is constituted is can the taking-up mode being disposed in the sewage accepting groove 31.That is, by being located at bottom locating bar 35 in the groove and left and right sides locating bar 36 and be fixed in specified location loosely.And in Fig. 5, symbol 37 is extracted valve for mud.The mud that is stranded in sewage accepting groove 31 is extracted valve 37 by open mud and is pulled out.

This waste disposal plant D ₂Other parts (control part etc.) structure substantially with waste disposal plant D ₁Identical in fact, the explanation that the Therefore, omited is detailed.

As shown in Figure 7, this waste disposal plant D ₂Group is gone into to small-sized merging treatment and purification groove 101 same as described above.

Send and return pipe and 122 be connected to waste disposal plant D ₂Sewage introducing port 31a.And return pipe 122 and be sent to waste disposal plant D via sending by primary water above riser pipe 123 picked up from handling tank 117 ₂, after implementing phosphoric acid removal and nitrogen removal, get back to the first anaerobic filter bed groove 104.

According to the described waste disposal plant of first aspect present invention, comprising: the sewage accepting groove; At least one group of electrode is configured at least a portion and is dipped in the sewage that is accommodated in this sewage accepting groove, and separates out iron ion or the aluminum ion of removing the phosphoric acid in this sewage in order to precipitation by electrolysis; Power supply flow to these electrodes in order to supply with the electrolysis electricity consumption; And control part, in order to control this power supply; Wherein, at least a portion of each electrode is covered by the carrier that the microorganism that participates in denitrification reaction in order to order in sewage perches; By making the reversal of poles of electrode termly, and become anodic electrode side, implement the removal of phosphoric acid, become the electrode side of negative electrode, implement the removal of the nitrogen that denitrification reaction carried out that is dependent on the microorganism on its carrier in polarity in polarity by control part.Therefore, can merge removal of execution phosphoric acid and nitrogen removes.

According to the described waste disposal plant of second aspect present invention, carrier is made of the porous endoplasmic reticular body of plastics system, carbon fiber system or sintered ceramic system, and hangs down from the upper limb of each electrode, or mounting is on the bottom surface in order to the electrode box of accommodating one group of electrode.Therefore, the above-mentioned effect that can positively guarantee first aspect present invention by simple structure and reached.

According to the described waste disposal plant of third aspect present invention, also comprise in order to one group of electrode is separated into the dividing plate of anode side and cathode side between mutually and in order to each electrode is imposed the aerating apparatus of aeration; Control part is more controlled aerating apparatus, imposes aeration and only polarity is become the anodic electrode.Therefore, except the above-mentioned effect that first aspect present invention reached, only the electrode of antianode side imposes aeration by aerating apparatus, and the phosphoric acid that promotes anode side is removed reaction, implement cleaning of this electrode simultaneously, on the other hand, the electrode of cathode side can be positioned in the reducing atmosphere.

According to the described waste disposal plant of fourth aspect present invention, also comprise in order to sewage is directed into the ingress pipe of sewage accepting groove; Dividing plate in the sewage accepting groove makes the sewage from ingress pipe flow into the sewage accepting groove via an end of dividing plate, then along one of dividing plate side or another side and be directed into the other end, walk around the other end then, along its another side or a side, and flow out via an end; Between ingress pipe and sewage accepting groove, more be provided with flow channel switching valve, in order to switch to from the sewage of ingress pipe in one of dividing plate side and the another side any one and guide it; Control part is more controlled flow channel switching valve, and sewage from ingress pipe is flowed into have polarity to become the side of dividing plate of the electrode of negative electrode.Therefore, thereafter, because the sewage that flows into the sewage accepting groove is walked around the other end of dividing plate, and advance towards the lateral direction of one of dividing plate with anode electrode, so after the fewer cathode side of dissolved oxygen concentration is implemented above-mentioned denitrification reaction fully, in the anode electrode side that the dissolved oxygen concentration by aeration rises, can implement cleaning of above-mentioned congealing reaction and electrode.

Claims

1. waste disposal plant comprises:

The sewage accepting groove;

At least one group of electrode is configured at least a portion and is dipped in the sewage that is accommodated in this sewage accepting groove, and separates out iron ion or the aluminum ion of removing the phosphoric acid in this sewage in order to precipitation by electrolysis;

Power supply flow to these electrodes in order to supply with the electrolysis electricity consumption; And

Control part is in order to control this power supply;

It is characterized in that:

At least a portion of each electrode is covered by the carrier that the microorganism that participates in denitrification reaction in order to order in sewage perches;

By making the reversal of poles of electrode termly, and become anodic electrode side, implement the removal of phosphoric acid, and become the electrode side of negative electrode, implement the removal of the nitrogen that denitrification reaction caused that is dependent on the microorganism on its carrier in polarity in polarity by control part.

2. waste disposal plant as claimed in claim 1, wherein, carrier is made of the porous endoplasmic reticular body of plastics system, carbon fiber system or sintered ceramic system, and hangs down from the upper limb of each electrode, or mounting is on the bottom surface in order to the electrode box of accommodating one group of electrode.

3. waste disposal plant as claimed in claim 1 or 2 wherein, also comprises in order to one group of electrode is separated into the dividing plate of anode side and cathode side between mutually and in order to each electrode is imposed the aerating apparatus of aeration;

Control part is more controlled aerating apparatus, imposes aeration and only polarity is become the anodic electrode.

4. waste disposal plant as claimed in claim 3 wherein, also comprises in order to sewage is directed into the ingress pipe of sewage accepting groove;

Dividing plate in the sewage accepting groove makes the sewage from ingress pipe flow into the sewage accepting groove via an end of dividing plate, then along one of dividing plate side or another side and be directed into the other end, walk around the other end then, along its another side or a side, and flow out via an end;

Between ingress pipe and sewage accepting groove, more be provided with flow channel switching valve, in order to switch to from the sewage of ingress pipe in one of dividing plate side and the another side any one and guide it;

Control part is more controlled flow channel switching valve, and sewage from ingress pipe is flowed into have polarity to become the side of dividing plate of the electrode of negative electrode.