CN1220975A

CN1220975A - Sewage treatment device

Info

Publication number: CN1220975A
Application number: CN98125540A
Authority: CN
Inventors: 森泉雅贵; 福本明広
Original assignee: Sanyo Electric Co Ltd
Current assignee: Sanyo Electric Co Ltd
Priority date: 1997-12-26
Filing date: 1998-12-21
Publication date: 1999-06-30
Also published as: TW442444B; JPH11188365A; KR19990063079A; KR100293311B1; JP3796033B2

Abstract

The invention provides a sewage treatment apparatus which removes phosphoric acid in sewage stably by preventing the passivation of insoluble phosphate forming metal ions when the ions are eluted electrochemically into sewage and can prevent the elevation of the voltage between electrodes. A sewage treatment apparatus is equipped with a sewage housing tank, four sets of iron electrodes in the tank, and a direct current power source and incorporated into a small-sized combination treatment purification tank. The power source supplies the current for electrolysis. Control unit maintains current density within 0.1 to 5.0mA/cm<2> for constant current electrolysis and polarity inversion to be indicated once every 30 mins-5 days.

Description

Waste disposal plant

The present invention relates to a kind of waste disposal plant, in more detail, relate to a kind of usefulness so that be contained in sanitary waste-water or the phosphoric acid of sewage such as sanitary wastewater and metal ion reaction that electrolysis is separated out and the waste disposal plant removed.

In the past, this kind waste disposal plant was known to lower device.

That is, be provided with the sewage accepting groove of the sewage of accommodating the desire processing, and in groove the configuration more than one group by the electrode that metal constituted that can form insoluble phosphate, and between these electrodes, apply voltage, can form the phosphatic metal ion of water-insoluble and separate out in sewage and electrochemically make, use making phosphoric acid form water-insoluble phosphoric acid salt and precipitate removal.

In waste disposal plant so, according to occasion, can form the solidity to corrosion oxide film thereon that be called as the passive state tunicle in the surface of electrode, its result might reduce or stop to form the anxiety of separating out (passive stateization) of the phosphatic metal ion of water-insoluble.If cause so passive stateization, then be difficult to maybe can not make phosphoric acid in the sewage to become water-insoluble phosphoric acid salt and remove.

According to occasion, and there is inter-electrode voltage to become Tai Gao and the anxiety of power consumption increase again.

In view of this, the present invention's purpose provides a kind of waste disposal plant, it can prevent terminating in the passive stateization in the time of electrochemically can forming the phosphatic metal ion of water-insoluble and separate out in sewage, stably removes the phosphoric acid in the sewage, can prevent the rising of inter-electrode voltage simultaneously.

According to the present invention, waste disposal plant is provided, it comprises: the sewage accepting groove; At least one group of electrode is equipped on this sewage accepting groove, and decomposes the iron ion or the aluminum ion of separating out in order to the phosphoric acid in the removal sewage by electricity; Power supply is in order to supply with electrolysis with continuous current electrode so far; And control part, the current density of control electrode can preventing the generation of passive state tunicle, and can prevent the rising of inter-electrode voltage.

The sewage accepting groove is accommodated the sewage of power supply disaggregating treatment.Electrode, and is decomposed by electricity iron ion or aluminum ion is separated out to the sewage accepting groove with set group of two one configuration set by the tabular thing of for example rectangle.Power supply supply with electric current that electricity decomposes usefulness to each organize electrode.

For example both are a kind of in the ferroelectric utmost point or the aluminium electrode for one group of electrode system, or one be made of person one of in iron and the aluminium, and another person is made of insoluble petal.In the former occasion, according to the desired reversal of poles of implementing electrode, and can prevent the passive stateization of electrode.And, be used as anode by the electrode that the person constituted one of in iron and the aluminium in the latter's occasion, be used as negative electrode by the electrode that insoluble petal constituted.Wherein, the insoluble petal electrode is for example silver electrode or platinum electrode etc.Again, one group of electrode preferably is fixed on electrical insulating property spacer of handlebar hand etc., and mutual interval remains in necessarily.

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

The current density of control part control electrode is with generation that can prevent the passive state tunicle and the anxiety that can prevent electric shock.So control current density is the result who studies owing to the contriver according to this case, some correlationship is arranged between the current density when finding out (1) passive stateization and electrolysis, (2) if current density is too small, then can cause passive stateization, (3) if current density is excessive, then inter-electrode voltage rises, and the event of the anxiety that increases power consumption is arranged.

That is the suitable current density when experiment showed, the constant-current electrolysis of implementing as separating out above-mentioned iron ion is 0.1～5.0mA/cm ², suitable current density is 0.2～6.0mA/cm when implementing as separating out the constant-current electrolysis of above-mentioned aluminum ion ²Wherein, during less than each lower value, can cause passive stateization, and when surpassing each higher limit, it is too high that inter-electrode voltage becomes, and increases the anxiety that consumes electric power and have in current density.And set inter-electrode voltage for 25V and be used as the higher limit that consumes electric power.

Experiment is proof also, when these current densities are separated out at above-mentioned iron ion, is preferably 0.2～4.0mA/cm ², and 0.4～3.0mA/cm more preferably ², when above-mentioned aluminum ion is separated out, be preferably 0.3～5.0mA/cm ², and 0.6～4.0mA/cm more preferably ²

According to waste disposal plant of the present invention, the sewage that flows into the sewage accepting groove circulates after outflow and inflow again, and the sewage quantity of establishing the every day that flows into the sewage accepting groove is V (liter/day), the phosphorus concentration that flows in the sewage of sewage accepting groove is p (a mg/ liter), be H (sec) cycling time till the sewage that flows into the sewage accepting groove flows into after flowing out again, constant is α, the electrode dipping total surface area S (cm when then flooding electrode in the sewage that is disposed at the sewage accepting groove ²) preferably tried to achieve by S=α * p * V ÷ H.Because the current density of the electrode in the electrolysis is determined by current value and electrode dipping total surface area S, so according to calculating the electrode dipping total surface area S that is tried to achieve the electrode dipping is disposed to the sewage of sewage accepting groove, uses to obtain desirable current density.

For example, establish ferroelectric very anode, iron (Fe) is b with the mol ratio Fe/P of phosphorus (P), and then current's intensity A (mA) is:

A=(p×10 ^-3÷30.97)×V×2×(96500÷H)×b

=6.23 * b * p * V ÷ H ... formula (1) wherein, 30.97 is the nucleidic mass of phosphorus, 2 is from the normal numerical value of Fel More=2g, 96500 is Faraday's number.

If current density is a (mA/cm ²), then S is:

S=A/a ... formula (2)

Therefore, can get by formula (1) and formula (2):

S=6.23b×p×V÷H÷a

=α * p * V ÷ H ... formula (3) wherein, α is α=6.23 * b ÷ a, is the constant that is determined by a and b.

According to waste disposal plant of the present invention, preferably whole electrodes is made of person one of in iron and the aluminium, and control part has the function to the reversal of poles of power supply indicator electrode, indicates a reversal of poles according to the value of the S that is tried to achieve every appropriate time simultaneously.By implementing reversal of poles, and can more positively prevent the passive stateization of electrode, so can seek electric decomposing efficiencyization so.

According to waste disposal plant of the present invention, preferably whole electrode systems is made of person one of in iron and the aluminium, and control part has the function to the reversal of poles of power supply indicator electrode, and when implementing above-mentioned constant-current electrolysis, control part was indicated a reversal of poles in per 30 minutes～five days again.By implementing polarity of electrode counter-rotating at regular intervals, and the passive stateization of electrode can be more positively prevented, and then electric decomposing efficiencyization can be sought.

Brief description of drawings is as follows:

Fig. 1 is the three-dimensional exploded view according to the waste disposal plant of the present invention's first embodiment.

The structure explanatory view of the part of the waste disposal plant of observation Fig. 1 above Fig. 2 serves as reasons.

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

Fig. 4 is the electrode body of Fig. 3 and the three-dimensional exploded view that electrode keeps body.

Fig. 5 is for being organized the amplification structure explanatory view within the merging treatment and purification groove by the waste disposal plant of top view Fig. 1.

Fig. 6 utilizes the waste disposal plant of Fig. 1 always current density to be maintained at 0.3mA/cm for showing ², and each hour do a reversal of poles implement constant-current electrolysis simultaneously the time the graphic representation of variation of inter-electrode voltage.

Fig. 7 utilizes the waste disposal plant of Fig. 1 always current density to be maintained at 0.5mA/cm for showing ², and each hour do a reversal of poles implement constant-current electrolysis simultaneously the time the graphic representation of variation of inter-electrode voltage.

Fig. 8 constructs explanatory view by the amplification that the waste disposal plant of top view the present invention's second embodiment is organized within the merging treatment and purification groove.

Fig. 9 implements current density and is lower than 0.1mA/cm for showing the waste disposal plant that utilizes Fig. 8 ²Constant-current electrolysis the time inter-electrode voltage variation and regularly and temporarily current density is risen to 0.1～5.0mA/cm ²The time the graphic representation of variation of inter-electrode voltage.

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

As shown in Figure 1, according to the waste disposal plant D of one of the present invention embodiment ₁Have: sewage accepting groove 1, four groups of

electrodes

2,3 and keep bodies 4 in order to supply with electric current to direct supply (not shown) and four electrodes of each

group electrode

2,3.

As shown in Figure 2, sewage accepting groove 1 is roughly the quadrate case by planeform and is constituted, and contains the sewage that desires such as sanitary waste-water or sanitary wastewater are handled.Be formed with effluent stream inlet 1a and sewage outfall 1b in the top of the opposing sidewalls of sewage accepting groove 1.And be provided with two root bottom part locating bars 5 of extension to left and right direction in the bottom of sewage accepting groove 1.Be provided with total six roots of sensation left and right sides locating bar 6 in the inboard of these bottom locating bars 5 towards vertical longitudinal extension again.

Each is organized

electrode

2,3 and is tabular iron of rectangle, and separates out in order to remove the iron ion of the phosphoric acid in the sewage by electricity decomposes.Shown in Fig. 3 and Fig. 4 amplify, the electrical insulating property spacer 7 of one group of

electrode

2,3 vinyl chloride resin system by being installed on their upper ends, and they are remained in necessarily at interval.Spacer 7 is provided with handle portion 7a.

Upper end at

electrode

2,3 is provided with terminal for connecting 8.These terminals 8 are connected on the junctor 10 via lead 9.Junctor 10 is connected on the above-mentioned power supply.For ease of explanation, will be called electrode body 11 by the aggregate that one group of

electrode

2,3 and a spacer 7, two terminals 8, two leads 9 and junctor 10 are constituted.

Shown in Fig. 3 and Fig. 4 amplification, it is that planeform is rectangular case shape thing that electrode keeps body 4, and is acrylic resin system.Electrode keeps the left and right sides wall of body 4 to become in order to separate adjacent electrode and keeps the mutual electrical insulating property dividing plate 4a of body 4.Electrode keeps the rear and front end of body 4 to become rectangular effluent stream inlet 4b and sewage outfall 4c respectively.

Again, electrode keeps the upper and lower surface of body 4 to stay circumference and central authorities' formation rectangle breach, forms electrode dismounting mouth 4d and aeration opening 4e respectively.And electrode keeps the left and right sides width (the mutual interval of face outside the two dividing plate 4a) of body 4 to equal the mutual interval of interior two adjacent left and right sides locating bars of sewage accepting groove 16 substantially.Electrode keeps two circular port 4f of face on the body 4 in order to spacer 7 is rotated with above electrode maintenance body 4 with screw.

So the electrode that is constituted keeps body 4 can the taking-up mode being disposed at sewage accepting groove 1.That is, by being located at bottom locating bar 5 in the groove and left and right sides locating bar 6 and be fixed in institute's allocation loosely.

Again, electrode body 11 keeps body 4 by electrode dismounting mouth 4d intercalation electrode, and spacer 7 is rotated with in electrode maintenance body 4 with screw, keeps on the body 4 thereby remain in electrode removably.Therefore, can be simply and implement the maintenance of

electrode

2,3 in short time and change operation.And one group of

electrode

2,3 and electrode keep two dividing plate 4a of body 4 to become parallel mutually.Therefore, electrode keeps the SS in the sewage in the body 4 not flow to sewage outfall 4b by effluent stream inlet 4a along the electrode surface of each

electrode

2,3 with not being detained.

As shown in Figures 1 and 2, electrode keeps the bottom surface central authorities of body 4 to form the concave part 1c that extends to left and right direction, and embeds an aeration tube 12 in this concave part 1c.

Aeration tube 12 is waste disposal plant D for this reason ₁The part of the aerating apparatus that has.That is, this aerating apparatus have be located at sewage accepting groove 1 outer to gas with fan (not shown), be connected in this fan and extend in the groove give tracheae (not shown) and be connected in this is equipped on trench bottom to tracheae aeration tube 12.

Keep the aeration opening 4e of body 4 via electrode, and carry out aeration, can improve the clean effect of

electrode

2,3 and dividing plate 4a by aeration tube 12.

As shown in Figure 5, this waste disposal plant D ₁Group is gone into to small-sized merging treatment and purification groove 101.

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

104 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.

The first anaerobic filter bed groove 104 is provided with the anaerobic filter bed 105 as the filter bed of anerobe, makes microorganism inhabit anaerobic filter bed 105, and implements anaerobic treatment.Anaerobic filter bed 105 is to roll throw out by flowing into the temporary transient current that flow into of water or back washing waste water, and makes it become suspended solid, flows out to next groove with inhibition, thereby can reduce the load of next groove.

106 is to be adjacent to the first anaerobic filter bed groove 104 and the second anaerobic filter bed groove that separates formation.In the second anaerobic filter bed groove 106, by perching anerobe, and implement anaerobic treatment in anaerobic filter bed 107.

108 is to be adjacent to the second anaerobic filter bed groove 106 and the biofilm filtration groove that separates formation.

The first anaerobic filter bed groove 104 and the second anaerobic filter bed groove 106 are separated by vertical next door 109.The upper opening in next door 109 forms the advection mouth 110 that runs through next door 109.And be embedded with advection pipe 111 in advection mouth 110.

The second anaerobic filter bed groove 106 and biofilm filtration groove 108 are separated by vertical next door 112.The upper opening in next door 112 forms the advection mouth 113 that runs through next door 112.And be embedded with advection pipe 114 in advection mouth 113.From the first anaerobic filter bed groove 104 via advection pipe 111 advection to the sewage of the second anaerobic filter bed groove 106 after anaerobic filter bed 107 flows down, deliver 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 a certain degree.The SS that is captured is anaerobic digestion and become dissolved matter gradually, or is used as mud and enlightening 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 passes through from aeration tube 116 blow out air, with the aerobic microorganism of oxygen supply to the aerobic filter bed 115 that inhabits biofilm filtration groove 108.

117 separate 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, store up after filtration and the treating water that advection is come and leave standstill storage.

118 for separating the disinfection trough that is formed on the processing tank 117.Disinfection trough 118 is disinfected the top primary water after handling tank 117 and handling, and by Outlet Pipe 103 it is expelled to the outside.

Separate by vertical next door 119 between biofilm filtration groove 108 and the processing tank 117.The upper opening in next door 119 forms the advection mouth 120 that runs through next door 119.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 after aerobic filter bed 115 flows down, 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.And from handle tank 117 by pick up the pipe 123 top primary waters that picked up via minute water metering device 124, send and return pipe 122 and be sent to waste disposal plant D ₁, after phosphorus supply removal processing, get back to the first anaerobic filter bed groove 104.

In Fig. 5,125 and 126 represent waste disposal plant D respectively ₁Control part that is had and power supply.Power supply 126 is supplied with electricity and is decomposed the electric current of usefulness to the

electrode

2,3 that is equipped within the sewage accepting groove 1.127 the expression be equipped on outside the sewage accepting groove 1 to the gas fan.Fan 127 is for cleaning the part of the aerating apparatus that its face uses by the electrode within the sewage accepting groove 12,3 and dividing plate 4a being imposed aeration.

Suppose the sewage quantity that flows into purification tank 101 be one day 1200 liters, the circular flows in the purification tank 101 are 6000 liters.At this moment, make the electric current that flow to the

electrode

2,3 that is equipped within the sewage accepting groove 1 be about 650A (also controlled mol ratio Fe/P=1.5～2.5 of making of the amount of separating out of iron ion).Making the interelectrode distance of each electrode body 11 is 25mm, and inter-electrode voltage always can be monitored.And the current density of the sewage accepting groove 1 when electrolysis is according to described formula (3) resulting S, can set set value for for the impregnating depth of sewage accepting groove 1 by

suitable adjustment electrode

2,3.

Control part 125 following controls, the current density in order to separate out above-mentioned iron ion during with electrolysis always is maintained at 0.1～5.0mA/cm ², and implement constant-current electrolysis, and a reversal of poles of indication in per 30 minutes～five days.Current density is less than 0.1mA/cm ²The time, cause passive stateization, surpass 5.0mA/cm ²The time, electrode voltage becomes more than about 25V, and increases power consumption.

At this, begin between three months by the running of purification tank 101, always keep current density in 0.3mA/cm by control part 125 ², and a reversal of poles of each hour do, implement constant-current electrolysis simultaneously.It the results are shown in Fig. 6.

According to Fig. 6, increased some, still stable when running begins by the trimestral inter-electrode voltage of beginning that turns round.The tp removal rate of this moment is 80～90%, and is extremely good.

For comparison, and begin always to keep current density in 0.05mA/cm by control part 125 between three months by the running of purification tank 101 ², and a reversal of poles of each hour do, implement constant-current electrolysis simultaneously.It the results are shown in Fig. 7.

According to Fig. 7, height when running begins by the trimestral inter-electrode voltage of running beginning.And the anode side at

electrode

2,3 produces oxygen.This is illustrated in anode side and states the iron ion amount on separating out and reduce, and causes the electrolysis of water.Can think that it is former because formed Fe on the surface of electrode 2,3 ₃O ₄Deng the passive state tunicle so.In the case, tp removal rate reduces the share of the amount of the separating out reduction of iron ion.As if the continuous operation of further implementing purification tank 101 with this current density, then inter-electrode voltage can rise, thereby increases power consumption.

The iron ion of being separated out by

electrode

2,3 generates phosphoric acid molysite and ironic hydroxide with being contained in the phosphate ion congealing reaction in the sewage.This reaction can be thought and takes place in anode side.Produce hydrogen at cathode side.This hydrogen has the effect of the generation of the passive state film on the surface of removing or preventing

counter electrode

2,3 or organic property dirt settling.In other words, this hydrogen itself has the clean effect of counter electrode 2,3.In the too little occasion of current density,, carry out the generation of passive state tunicle by part that the generation of this hydrogen tails off.

Secondly, always current density is maintained at 0.3～5.0mA/cm ²Scope in various certain values, and per 30 minutes～five heaven-made reversal of poles, and implement constant-current electrolysis.Its result all can see the effect of stable removal phosphorus.

Electrode

2,3 dippings are disposed at this waste disposal plant D ₁The sewage of sewage accepting groove 1 in the time electrode dipping total surface area S (cm ²) try to achieve by above-mentioned formula (3) in order to obtain desirable current density.

For example, the phosphorus concentration p that makes the inflow side is 5mg/ when rising, if in the scope (this scope be suitable, and 1.5～2.0 is effective) of mol ratio Fe/P1.0～2.5, utilize 1.5, then Bi Yao concentration of iron is the 14mg/ liter.If establish to waste disposal plant D ₁Sewage influx and be respectively 1200 liters/day and 23.5 hours cycling time, then the Faradaic current value of sewage accepting groove 1 is 690mA.

Therefore, be 1.0mA/cm if establish desirable current density a ², then be set to 690cm by formula (3) S ²

In other words, if decision flows into phosphorus concentration, sewage influx, cycling time, then can try to achieve optimal electrode dipping total surface area.Second embodiment

As shown in Figure 8, according to the waste disposal plant D of another embodiment of the present invention ₂Have: sewage accepting groove 1, four groups of iron electrodes, report the LED lamp 128 and the control part 129 of portion with fan 127, as vision to the direct supply 126 of each group electrode, to gas in order to supply with electric current.

Electrode and waste disposal plant D ₁Identical.If the inter-electrode voltage in the electrolysis becomes more than the 25V, then LED lamp 128 is lighted, and uses vision ground the outside is reported.This is lighted by the indication of control part 129 and implements.

Control part 129 is lower than 0.1mA/cm in the execution current density ²The occasion of constant-current electrolysis, be controlled to regularly and temporarily current density risen to 0.1～5.0mA/cm ²The one side is shown in Fig. 9.

That is, shown in the upside of Fig. 9, current density is being maintained at 0.05mA/cm ², and did a reversal of poles in per 12 hours, to implement the occasion of constant-current electrolysis, the phosphorus removal effect worsens.Can think that this is to have produced the event of passive state film in electrode surface.Shown in the downside of Fig. 9, at 0.05mA/cm ²Current density under implement ten hours constant-current electrolysis, then at 0.2mA/cm ²Current density under implement two hours constant-current electrolysis, do reversal of poles then, again at 0.05mA/m ²Current density under implement the occasion of ten hours constant-current electrolysis, obtained high phosphorus removal effect.Can think that this is to have destroyed, removed the event of the passive state tunicle that is produced by the temporary transient rising of current density.

So high phosphorus removal effect can be kept by current density is risen.

Waste disposal plant D ₂The structure and the waste disposal plant D of other parts ₂The effect that is reached in fact with waste disposal plant D ₁The explanation identical, that the Therefore, omited is detailed.

In addition, in embodiments of the invention, though describe in detail by waste disposal plant D ₁Or waste disposal plant D ₂Remove the structure of the phosphoric acid in the interior sewage of small-sized merging treatment and purification groove 101, but also can be used for the removal of the phosphoric acid in the water in tank, plant or aquarium etc.

According to the described sewage-treatment plant of the present invention's first scheme, comprising: the sewage accepting groove; Electrode, The iron ion or the aluminium ion that decompose to separate out to remove the phosphoric acid in the sewage by electricity; Power supply, in order to Electrolysis is supplied to electrode with constant current; And control part, the current density of control electrode is preventing End the generation of passive state tunicle, and can prevent the rising of inter-electrode voltage. Therefore, by with current density Be maintained at suitable value and implement constant-current electrolysis, can prevent from electrochemically can forming insoluble phosphoric acid Passive state when the metal ion of salt is separated out in sewage, and then can stably remove phosphorus in the sewage Acid can prevent the increase of power consumption simultaneously.

According to the described sewage-treatment plant of alternative plan of the present invention, control part is controlled described current density, when Iron pick up, makes it always be maintained at 0.1～5.0mA/cm²Scope in certain value, when aluminium ion is separated out, make it always be maintained at 0.2～6.0mA/cm²Scope in certain value. Cause This is maintained at suitable value by the abnormal ascending that prevents inter-electrode voltage with current density, can be more Positively reach the described above-mentioned effect of the present invention's first scheme.

According to the described sewage-treatment plant of third party's case of the present invention, the sewage that flows into the sewage accepting groove circulates after flowing out and again inflow, if the sewage quantity of every day of inflow sewage accepting groove is V (rising/day), the phosphorus concentration that flows in the sewage of sewage accepting groove is p (mg/ liter), be H (sec) circulation timei till the sewage that flows into the sewage accepting groove flows into after flowing out again, constant is α, the electrode dipping total surface area S (cm when then flooding electrode in the sewage that is disposed at the sewage accepting groove²) by S=α * p * V ÷ H Institute tries to achieve. Therefore, because the current density of the electrode in the electrolysis is flooded total surface by current value and electrode Long-pending S determines, so according to calculating the electrode dipping total surface area S that tries to achieve electrode is flooded configuration To the sewage of sewage accepting groove, can obtain desirable current density.

According to the described sewage-treatment plant of the cubic case of the present invention, electrode all is the ferroelectric utmost point or whole Be the aluminium electrode, and control part also has the function to the polarity inversion of power supply indicator electrode, the while foundation The value of the S that tries to achieve and every a polarity inversion of appropriate time indication. Therefore, by each regularly Between implement the polarity inversion of electrode, and more positively prevent the blunt of electrode that third party's case of the present invention is described Attitude, and can seek the efficient activity that electricity decomposes.

Claims

1. a waste disposal plant is characterized in that, this waste disposal plant comprises:

The sewage accepting groove;

At least one group of electrode is equipped on this sewage accepting groove, and decomposes the iron ion or the aluminum ion of separating out in order to the phosphoric acid in precipitation, the removal sewage by electricity;

Power supply, in order to supply with electrolysis with continuous current to this electrode; And

Control part, the current density of control electrode can preventing the generation of passive state tunicle, and can prevent the rising of inter-electrode voltage.

2. waste disposal plant as claimed in claim 1, wherein control part control current density makes it when iron ion is separated out, and always is maintained at 0.1～5.0mA/cm ²Scope in certain value, when aluminum ion is separated out, always be maintained at 0.2～6.0mA/cm ²Scope in certain value.

As right ask 1 or 2 described waste disposal plants, the sewage that wherein flows into the sewage accepting groove flows in flowing out the back circulation again, if flow into the sewage quantity of every day of sewage accepting groove is V (liter/day), the phosphorus concentration that flows in the sewage of sewage accepting groove is p (a mg/ liter), be H (sec) cycling time till the sewage that flows into the sewage accepting groove flows into after flowing out again, constant is α, the electrode dipping total surface area S (cm when then flooding electrode in the sewage that is disposed at the sewage accepting groove ²) tried to achieve by S=α * p * V ÷ H.

4. waste disposal plant as claimed in claim 3, wherein electrode all is the ferroelectric utmost point or all is the aluminium electrode, control part also has the function to the reversal of poles of power supply indicator electrode, indicates a reversal of poles according to the value of the S that is tried to achieve every appropriate time simultaneously.