JP3973276B2 - Sewage treatment equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sewage treatment apparatus that purifies sewage, and more particularly to a sewage treatment apparatus that removes phosphorus from sewage.
[0002]
[Prior art]
As this kind of sewage treatment apparatus, for example, JP-A-3-89998 (C02F)
What is described in 3/12) is known.
[0003]
This apparatus is provided with a return path for returning the sewage in the aerobic part disposed in the treatment tank to the anaerobic part, and an elution tank for eluting iron ions by supplying current to the return path is provided in the return path. In this configuration, orthophosphoric acid and iron ions in the sewage are reacted to aggregate and precipitate as a water-insoluble phosphorus compound to remove phosphorus from the sewage.
[0004]
However, there is a possibility that hydrogen gas generated from the electrode accompanies electrolysis of the electrode and accumulates in the treatment tank.
[0005]
[Problems to be solved by the invention]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a sewage treatment apparatus that can prevent explosion caused by hydrogen gas generated by electrode electrolysis and improve reliability.
[0006]
[Means for Solving the Problems]
The 1st means for solving the above-mentioned subject is a processing tank which has an anaerobic part, an aerobic part, a sedimentation part, and a disinfection part, and a drain outlet which drains the treated water processed by this processing tank outside the processing tank A diffuser pipe having an air outlet disposed at the bottom of the aerobic part, a blower for supplying air to the diffuser pipe, an electrode made of iron or aluminum, disposed in the treatment tank, An elution tank for energizing the electrode to elute iron ions or aluminum ions, and a supply means for supplying the iron ions or aluminum ions eluted in the elution tank to the treatment tank,
The sedimentation part is partitioned from the aerobic part by a partition wall, and the disinfection part is provided on the top of the sedimentation part,
The drain port communicates with the disinfection unit,
The elution tank is provided and the drain outlet side above said diffuser tubes within the aerobic unit,
Hydrogen generated by electrolysis is discharged from the open upper surface of the elution tank to the treatment tank, and is discharged out of the treatment tank through the drain port by air supplied from the air diffuser. To do.
[0007]
The 2nd means for solving the above-mentioned subject is a processing tank which has an anaerobic part, an aerobic part, a sedimentation part, and a disinfection part, and a drain outlet which drains the treated water processed by this processing tank outside the processing tank A diffuser pipe having an air outlet disposed at the bottom of the aerobic part, a blower for supplying air to the diffuser pipe, an electrode made of iron or aluminum, disposed in the treatment tank, and elution tank eluting iron ions or aluminum ions by energizing the electrodes, and a supply means for supplying iron ions or aluminum ions eluted into the elution vessel to a processing vessel, wherein the precipitation section the good by a partition wall The disinfecting part is provided on the upper part of the settling part, and is divided from the air part,
The drain port communicates with the disinfection unit,
The exhaust port for exhausting air in the elution vessel is provided and the drain outlet side above said diffuser tubes within the aerobic unit,
Hydrogen generated by electrolysis is discharged to the treatment tank from the exhaust port, and is discharged outside the treatment tank through the drain port by air supplied from the diffuser .
[0008]
The 3rd means for solving the above-mentioned subject is a processing tank which has an anaerobic part, an aerobic part, a sedimentation part, and a disinfection part, and a drain outlet which drains the treated water processed by this processing tank outside the processing tank A diffuser pipe having an air outlet disposed at the bottom of the aerobic part, a blower for supplying air to the diffuser pipe, an electrode made of iron or aluminum, disposed in the treatment tank, An elution tank for energizing the electrode to elute iron ions or aluminum ions, and a supply means for supplying the eluted iron ions or aluminum ions to the treatment tank are exhausted from the elution tank. One end of the exhaust path is connected to the elution tank, and the other end of the exhaust path is located above the air diffuser and toward the drain outlet.
[0009]
In the first to third means for solving the above-mentioned problems, it is preferable to provide a control means for increasing the air flow rate of the air blower every predetermined time.
[0010]
In the first to third means for solving the above-described problems, it is preferable to provide an aeration apparatus for aerating the inside of the elution tank.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The first embodiment of the present invention will be described in detail below based on the sewage treatment apparatus shown in FIGS.
[0012]
Reference numeral 1 denotes a treatment tank buried in the ground. The inside of the treatment tank 1 is divided into a first anaerobic part 5, a second anaerobic part 10, an aerobic part 14, a sedimentation part 34, and a disinfecting part by a first partition wall 2, a second partition wall 3 and a third partition wall 4. It is divided into 35 areas.
[0013]
Reference numeral 5 denotes a first anaerobic part having an inlet 6 through which sewage such as domestic wastewater flows, and 7 denotes a first anaerobic filter bed disposed in the first anaerobic part 5, which flows into the first anaerobic part 5. The hard-to-decompose contaminants mixed in the sewage are precipitated and separated, the organic matter is anaerobically decomposed by the anaerobic microorganisms attached to the first anaerobic filter bed 7, and the organic nitrogen is changed to ammonia nitrogen. .
[0014]
Reference numeral 8 denotes a first advection pipe disposed in the first anaerobic part 5, and the sewage that has been anaerobically decomposed by the first anaerobic part 5 passes through a first water supply port 9 that penetrates the upper part of the first partition wall 2. And supplied to a second anaerobic section 10 to be described later.
[0015]
Reference numeral 10 denotes a second anaerobic part partitioned from the first anaerobic part 5 by the first partition wall 2, and 11 denotes a second anaerobic filter bed disposed in the second anaerobic part 10, the second anaerobic filter bed. 11 traps suspended solids and anaerobically decomposes organic matter with anaerobic microorganisms, and converts organic nitrogen to ammonia nitrogen.
[0016]
Reference numeral 12 denotes a second advection pipe disposed in the second anaerobic part 10, and the sewage decomposed anaerobically in the second anaerobic part 10 is passed through a second water supply port 13 penetrating the upper part of the second partition wall 3. Then, water is supplied to the aerobic part 14 described later. Reference numeral 14 denotes an aerobic part partitioned from the second anaerobic part 10 by the second partition wall 3, and the sewage treated by the second anaerobic part 10 flows through the second advection pipe 12. 15 is a contact material disposed in the aerobic part 14 and promotes cultivation of aerobic microorganisms.
[0017]
Reference numeral 16 denotes a first air diffuser disposed at the bottom of the aerobic section 14, which forms a large number of air outlets and is connected to the first blower 17, and air supplied from the first blower 17 is used as an air outlet. The aerobic part 14 is maintained in an aerobic state by releasing from the sewage, and the sewage is aerobically decomposed by aerobic microorganisms, and ammonia nitrogen is converted to nitrate or nitrite nitrogen by the action of nitrate bacteria and nitrite bacteria. To change. The first blower 17 is controlled by the control unit so as to increase the air flow rate every predetermined time.
[0018]
Reference numeral 18 denotes a second air diffuser disposed below the contact material 15 and having a large number of air outlets, and is connected to the first blower 17. Air is supplied from the first blower 17 to either the first air diffuser 16 or the second air pipe 18 by a first electromagnetic valve (not shown).
[0019]
The first solenoid valve normally discharges the air supplied from the first blower 17 from the air outlet of the first air diffuser 16 to maintain the inside of the aerobic portion 14 in an aerobic state and cleans the contact material 15. At that time, the control unit switched the first solenoid valve to the second air diffuser 18, released air from the air outlet of the second air diffuser 18, adhered to the contact material 15 and proliferated and gradually became thicker. Remove biofilm.
[0020]
19 is a rectangular box-like shape disposed above the first air diffuser 16 in the aerobic section 14 and on the side of a drain outlet 37 described later, and at a position facing a third inspection opening 42 described later. In the elution tank, the interior of the elution tank 19 is divided into an electrode arrangement chamber 20, a first water diversion chamber 21, and a second water diversion chamber 22. 23 is an electrode made of an iron material arranged in the electrode arrangement chamber 20, and by supplying a DC constant current from a power supply device (not shown) between the electrodes 23, iron ions eluted from the electrode 23 enter the elution tank 19. Supplied.
[0021]
The first water diversion chamber 21 communicates with a first return pipe 24 that communicates the bottom of the aerobic part 14 and the upper part of the first anaerobic part 5 via a pipe 25, and the electrode disposition room 20 is an upper part of the partition wall. Are communicated by a notch 26 opened in a V shape. The second water diversion chamber 22 communicates with the upper portion of the aerobic portion 14 through a discharge port 27 and communicates with the electrode arrangement chamber 20 through an opening formed by an overflow dam plate 28 whose height can be adjusted. ing.
[0022]
By adjusting the height of the overflow dam plate 28, changing the height of the opening formed by the overflow dam plate 28, and setting the amount of sewage returned from the second diversion chamber 22 to the aerobic part 14, The amount of sewage flowing into the first return pipe 24 from the first water diversion chamber 21 can be adjusted.
[0023]
Reference numeral 29 denotes a second return pipe that communicates the electrode arrangement chamber 20 and a settling portion 34 described later. Reference numeral 30 denotes a third air diffuser disposed on the inner bottom of the second return pipe 29, which forms a large number of air outlets and is connected to the second blower 31, and the air supplied from the second blower 31 is air. By discharging from the outlet, the sewage in the sedimentation section 34 is sucked into the second return pipe 29 and transferred to the electrode arrangement chamber 20.
[0024]
Reference numeral 32 denotes a fourth air diffuser disposed at the inner bottom of the first return pipe 24, which forms a large number of air outlets and is connected to the second blower 31. Air from the second blower 31 is supplied to either the third air diffuser 30 or the fourth air diffuser 32 by a second electromagnetic valve (not shown).
[0025]
The second solenoid valve normally switches to the third air diffuser 30 and discharges the air supplied from the second blower 31 from the air outlet of the third air diffuser 30 so that the supernatant liquid in the settling portion 34 is discharged. 2 It sucks into the return pipe 29 and is transferred to the electrode arrangement chamber 20.
[0026]
After cleaning the contact material 15, the air supply from the second blower 31 is switched to the fourth air diffuser 32, and the air is discharged from the air outlet of the fourth air diffuser 32. Flows into the first anaerobic part 5 through the first return pipe 24. With this flow, the sludge accumulated at the bottom of the aerobic part 14 and the sludge returned to the aerobic part 14 from the settling part 34 are sucked into the first return pipe 24 and returned to the first anaerobic part 5.
[0027]
A communication port 33 is provided at the bottom of the third partition wall 4 and communicates the aerobic part 14 and a precipitation part 34 described later. 34 is a settling portion partitioned from the aerobic portion 14 by the third partition wall 4 and separates the sewage which is aerobically decomposed by the aerobic portion 14 and flows from the communication port 33 into sludge and supernatant. Further, in order to return the sludge accumulated on the bottom of the sedimentation part 34 to the aerobic part 14 from the communication port 33, the bottom of the sedimentation part 34 is inclined toward the aerobic part 14.
[0028]
Reference numeral 35 denotes a disinfecting section provided at the upper part of the settling section 34, and the supernatant liquid separated in the settling section 34 flows therein. Reference numeral 36 denotes a sterilizer provided in the sterilization unit 35, which sterilizes the sewage flowing into the sterilization unit 35 with a chlorine-based chemical or the like provided in the sterilization device 36. 37 is a drain opening communicating with the sterilization unit 35, and drains the sewage sterilized in the sterilization unit 35 to the outside of the treatment tank 1.
[0029]
Reference numeral 38 denotes a first inspection opening provided at a position facing the first anaerobic part 5, and 39 denotes a first lid for closing the first inspection opening 38 so as to be openable and closable. It opens and closes when the accumulated sludge is removed by suction.
[0030]
Reference numeral 40 denotes a second inspection opening provided at a position facing the second anaerobic part 10 and the aerobic part 14 above the second partition wall 3, and reference numeral 41 denotes a second inspection opening 40 that can be opened and closed freely. 2 lids. 42 is a third inspection opening provided at a position facing the sterilization device 36 and the elution tank 19, and 43 is a third lid for closing the third inspection opening 42 so that it can be closed. It opens and closes during chlorine-based chemical replenishment and elution tank 19 maintenance.
[0031]
Thus, the sewage discharged from the home flows into the first anaerobic part 5 from the inflow port 6, and the first anaerobic filter bed 7 disposed in the first anaerobic part 5 causes toilet paper or the like in the sewage. Relatively coarse solids and contaminants are removed, and a preliminary treatment for smoothly performing the treatment in each processing section that flows later is performed, and the removed solids, contaminants, and the first anaerobic filter bed 7 are removed. The sewage passing through the water is anaerobically decomposed by the action of the anaerobic microorganisms, BOD is reduced, and sludge generated by the decomposition of the sewage is deposited at the bottom of the first anaerobic part 5. In addition, organic nitrogen changes to ammonia nitrogen by the action of anaerobic microorganisms.
[0032]
The sewage that has been anaerobically decomposed by the flow of new sewage into the first anaerobic part 5 flows into the second anaerobic part 10 from the first water supply port 9 of the first advection pipe 8. The sewage flowing into the second anaerobic part 10 is anaerobically decomposed by the action of the anaerobic microorganisms in the second anaerobic filter bed 11 to reduce the BOD, and the sludge generated by the decomposition of the sewage is the bottom of the second anaerobic part 10. To deposit. In addition, organic nitrogen changes to ammonia nitrogen by the action of anaerobic microorganisms.
[0033]
As new sewage flows into the second anaerobic part 10, sewage decomposed anaerobically in the second anaerobic filter bed 11 flows into the aerobic part 14 from the second water supply port 13 of the second advection pipe 12. The air supplied from the blower 17 is agitated by being discharged from the air outlet of the first air diffuser pipe 16.
[0034]
Then, oxygen is dissolved in the sewage, and aerobic microorganisms adhered to the surface of the contact material 15 aerobically decompose the sewage, decompose organic phosphates etc. into orthophosphoric acid, etc. Change to nitrate or nitrite nitrogen. Further, sludge generated by the decomposition of the sewage accumulates at the bottom of the aerobic part 14.
[0035]
As new sewage flows into the aerobic part 14, the sewage aerobically decomposed by the action of aerobic microorganisms attached to the contact material 15 flows into the sedimentation part 34 from the communication port 33 at the bottom of the aerobic part 15. The sewage that has flowed into the sedimentation part 34 settles while the sedimentary part 34 rises and is returned to the aerobic part 14 from the communication port 33, and the supernatant liquid flows into the disinfection part 35. The supernatant liquid that has flowed into the disinfecting section 35 is sterilized by a sterilization device 36 equipped with a chemical such as chlorine, kills bacteria such as pathogenic bacteria, and is drained out of the treatment tank 1 through the drain 37.
[0036]
By discharging the air supplied from the second blower 31 from the air outlet of the third air diffuser 29, the sewage in the sedimentation section 34 flows into the electrode arrangement chamber 20, and the iron ions eluted from the electrode 23 are supplied. Is done. Further, the sewage in the electrode disposition chamber 20 is agitated by the air supplied from the third air diffuser 30 to prevent the sludge and the like from adhering to the surface of the electrode 23, and the air supplied from the third air diffuser 30. The oxygen contained therein can be used to oxidize the divalent iron ion eluted from the electrode 23 to the trivalent iron ion that reacts with orthophosphoric acid, and the dephosphorization efficiency can be further improved.
[0037]
Sewage supplied with trivalent iron ions in the electrode arrangement chamber 20 flows into the first water diversion chamber 21 and the second water diversion chamber 22. The amount of water returned from the second diversion chamber 22 to the aerobic part 14 is determined by changing the height of the opening of the overflow weir plate 28 that communicates the second diversion chamber 22 and the electrode arrangement chamber 20. The amount of sewage flowing from the first water diversion chamber 21 into the first return pipe 24 can be adjusted to a predetermined amount.
[0038]
The iron ions in the sewage returned from the second water diversion chamber 22 to the aerobic part 14 react with orthophosphoric acid present in the aerobic part 14 and aggregate and precipitate as a water-insoluble phosphorus compound. Further, iron ions in the sewage returned from the first water diversion chamber 21 to the first anaerobic part 5 through the first return pipe 24 react with orthophosphoric acid present in the first anaerobic part 5 and become water insoluble. The nitrogenous and nitrite nitrogen in the sewage returned to the first anaerobic part 5 is reduced by the denitrifying bacteria present in the first anaerobic part 5 and air as nitrogen gas. Escaped and removed.
[0039]
The sewage returned to the first anaerobic part 5 from the elution tank 19 is supplied from the precipitation part 34 instead of the aerobic part 14 having an extremely high dissolved oxygen concentration, and the first water diversion chamber 21 and the second Since the sewage in the elution tank 19 is returned to the first anaerobic part 5 with little influence on the anaerobic microorganisms, anaerobic decomposition can be performed because the water is adjusted to a predetermined amount by the water diversion chamber 22.
[0040]
Since the biofilm formed by aerobic microorganisms adhering to the contact material 15 grows and gradually thickens, the control unit periodically controls the first electromagnetic valve to prevent clogging, and the The air supply is switched to the second air diffuser 18, and air is released from the air outlet of the second air diffuser 18 to separate the biofilm.
[0041]
When the air supply from the second air diffuser 18 is finished, the peeled biofilm accumulates as sludge on the bottom of the aerobic part 14, but the control part controls the second electromagnetic valve to supply the air from the second blower 31. Is switched to the fourth air diffuser 32, and air is discharged from the air outlet of the fourth air diffuser 32 so that the sewage in the aerobic part 14 is accumulated along with the sludge accumulated on the bottom of the aerobic part 14 and the first return pipe 24. To the first anaerobic part 5.
[0042]
The elution tank 19 is arranged facing the third inspection opening 42, and the elution tank 19 should be checked when the third lid 43 is opened and the sterilizer 36 of the disinfection tank 34 is replenished with chemicals. Can do.
[0043]
Since hydrogen gas is generated from the electrode 23 by electrolysis of the electrode 23, if hydrogen gas accumulates in the elution tank 19 or the processing tank 1 and the hydrogen gas concentration rises, there is a risk of explosion when the fire is accidentally approached. There is.
[0044]
Therefore, in the present embodiment, the elution tank 19 is disposed on the drain outlet 37 side of the first air diffuser 16, and the hydrogen gas generated in the elution tank 19 and flowing into the treatment tank 1 is discharged to the first air diffuser. Together with the air supplied from 16, it is discharged out of the processing tank 1 through the drain 37 to prevent explosion.
[0045]
Furthermore, since the upper surface of the electrode disposition chamber 20 of the elution tank 19 is open and air is supplied from the third air diffuser 30 to the electrode disposition chamber 20 of the elution tank 19, hydrogen gas generated from the electrode 23 is obtained. Is reliably discharged from the elution tank 19 into the processing tank 1 together with the air supplied from the third air diffuser 30, so that the hydrogen gas generated from the electrode 23 is drained by the air supplied from the first air diffuser 16. It can be discharged out of the processing tank 1 through the port 37.
[0046]
Moreover, since it is set as the structure which increases the ventilation volume of the 1st blower 17 for every predetermined time by a control part, the hydrogen in the processing tank 1 can be reliably discharged | emitted out of the processing tank 1 through the drain outlet 37. FIG.
[0047]
4 and 5 show a second embodiment. In order to prevent dust and the like from entering the elution tank 19, the sealed elution tank 19 faces the second opening 41 and the first dust is scattered. The exhaust pipe 44 is provided as an exhaust passage for exhausting the air in the elution tank 19 from the trachea 16 to the inlet 6 side, and the tip of the exhaust pipe 44 faces the drain outlet 37 side from the first air diffuser 16. It has a configuration.
[0048]
With this configuration, as in the first embodiment, the hydrogen gas generated in the elution tank 19 is exhausted into the treatment tank 19 from the tip of the exhaust tube 44, and the drain 37 is supplied by the air supplied from the first air diffuser 16. It is made to discharge out of the processing tank 1 through and to prevent explosion. With this configuration, the elution tank 19 can be discharged to the outside of the treatment tank 1 without necessarily providing the elution tank 19 on the drain 37 side of the first air diffuser 16. It can arrange | position in arbitrary positions in the tank 1, and the freedom degree of the arrangement position of the elution tank 19 can be improved.
[0049]
Although the exhaust pipe 44 is used as the exhaust path in the present embodiment, the present invention is not limited to this.
[0050]
If the electrode 23 made of iron is immersed in the sewage in the elution tank 19 for a long time, an oxide film is generated on the surface of the electrode 23, and the elution amount of iron ions gradually decreases in a passive state. Dephosphorization performance decreases.
[0051]
Therefore, it is preferable that a constant DC current is supplied between a pair of electrodes made of iron and the polarity of the current is changed every predetermined time. When used for a long period of time, an oxide film is generated on the surface of the iron material on the anode side, but the surface of the iron material on the cathode side is washed with hydrogen gas generated from the iron material on the cathode side, and no oxide film is generated. Therefore, the elution of iron ions can be maintained substantially constant by changing the polarity at a time interval until an oxide film is generated on the iron material surface on the anode side and the elution amount of iron ions decreases. The performance can be kept constant.
[0052]
Moreover, in this structure, since both electrodes are made of iron material, iron ions are always eluted from the iron material serving as the anode side electrode and supplied to the sewage, so that the dephosphorization performance can always be maintained in a constant state. .
[0053]
In the above configuration, a DC constant current of 1 to 1.2 A is supplied in the present embodiment. In addition, the time interval for switching the polarity of the current may be about 4 minutes or more when the actual elution amount with respect to the theoretical iron ion elution value is about 90% or more, and within 2 months when the oxide film is generated on the surface of the iron material. In order to improve the durability of the switching element that converts the current and to prevent only the iron material serving as the anode side electrode from decreasing due to elution of iron ions and to make both electrodes substantially uniform in a reduced state, within one week, Within one day, the polarity is preferably changed every 4 hours in this embodiment.
[0054]
Alternatively, an iron material may be used at least on the anode side of the electrode, a constant DC current may be supplied to both electrodes, and the supply current may be increased in a pulse shape every predetermined time. In this configuration, by increasing the supply current in a pulsed manner, the oxide film generated on the surface of the anode-side iron material can be peeled off, and the elution of iron ions is maintained substantially constant, and the dephosphorization performance is kept constant. Can be maintained.
[0055]
In the above configuration, in the present embodiment, a DC constant current of 1 to 1.2 A is supplied, and a pulse current of 3 to 4 A is supplied for a total of 24 minutes per 4 hours.
[0056]
Furthermore, the two types of supply current configurations described above are combined, a constant DC current is supplied between a pair of electrodes made of iron material, the polarity of the current is changed every predetermined time, and the supply current is increased in pulses. Also good. When the time until the polarity change is long, an oxide film is formed on the surface of the iron material on the anode side. By changing the polarity, the oxide film can be removed by washing with hydrogen gas. Some time is required until peeling, and since the electric resistance until the oxide film is peeled off is large, power consumption may increase.
[0057]
Therefore, by increasing the supply current in a pulsed manner as described above, the oxide film on the iron material surface converted from the anode to the cathode can be removed in a short time, and an increase in power consumption can be prevented.
[0058]
In the embodiment of the present invention, an iron material is used for both electrodes as an electrode for supplying a DC constant current to elute iron ions. However, an iron material is used for the anode side electrode, and the cathode side electrode is made of titanium, platinum, or the like. Alternatively, the insoluble material may be used.
[0059]
Furthermore, in the embodiment of the present invention, an iron material is used for both electrodes as an electrode for supplying a constant DC current and eluting iron ions, but a configuration using aluminum may also be used.
[0060]
【The invention's effect】
According to the configuration of the first aspect of the present invention, the hydrogen gas generated in the elution tank is exhausted from the drainage port to the outside of the treatment tank using the air blown from the air diffuser for supplying oxygen to the aerobic part. Explosion can be prevented, reliability can be improved, and the structure can be simplified.
[0061]
According to the configuration of the second aspect of the present invention, since the exhaust port for exhausting the air in the elution tank is provided on the drain outlet side from the diffuser tube, the hydrogen discharged from the elution tank into the treatment tank through the exhaust port Gas can be discharged out of the treatment tank from the drain by blowing air from an air diffuser for supplying oxygen to the aerobic part, preventing explosions, improving reliability, and simplifying the configuration There are effects such as
[0062]
According to the third aspect of the present invention, since the other end of the exhaust path for exhausting the air in the elution tank faces the drain outlet side from the air diffuser, it is discharged from the elution tank into the treatment tank through the exhaust path. Explosion can be prevented by discharging the hydrogen gas thus discharged out of the treatment tank from the drain port by blowing air from an air diffuser for supplying oxygen to the aerobic part, and reliability can be improved.
[0063]
Furthermore, the hydrogen gas generated from the elution tank can be discharged outside the treatment tank without necessarily providing the elution tank on the drain outlet side of the diffuser, so the elution tank is disposed at any position within the treatment tank. It is possible to improve the degree of freedom of the disposition position of the elution tank.
[0064]
According to the configuration of the fourth aspect of the present invention, the hydrogen gas in the treatment tank is surely discharged from the drain port in order to perform control to increase the air flow rate of the air blower that supplies air to the air diffuser every predetermined time. There is an effect such as being able to.
[0065]
According to the configuration of claim 5 of the present invention, it is possible to prevent sludge and the like from adhering to the electrode by the air supplied from the aeration apparatus, and to oxidize ions eluted from the electrode to ions that react with phosphorus. Furthermore, the hydrogen gas generated in the elution tank can be efficiently discharged into the treatment tank by the air supplied from the aeration apparatus, and the configuration can be simplified and the reliability can be improved. There is an effect such as being able to.
[Brief description of the drawings]
FIG. 1 is a sectional view of a sewage treatment apparatus according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of the above.
FIG. 3 is a perspective view of the elution tank.
FIG. 4 is a cross-sectional view of a sewage treatment apparatus according to a second embodiment of the present invention.
FIG. 5 is a cross-sectional view of the same.
[Explanation of symbols]
1 treatment tank 5 first anaerobic part
10 Second Anaerobic Club
14 Aerobic
16 First air diffuser (air diffuser)
17 First blower (blower)
19 Elution tank
23 electrodes
30 3rd air diffuser (aeration device)
34 Settling part
35 Disinfection part
37 Drain port

Claims (5)

A treatment tank having an anaerobic part, an aerobic part, a sedimentation part and a disinfection part, a drain outlet for draining treated water treated in the treatment tank to the outside of the treatment tank, and an air outlet provided at the bottom of the aerobic part An air diffuser tube, an air blower for supplying air to the air diffuser tube, an electrode made of iron or aluminum, which is disposed in the treatment tank, and energizes the electrode to elute iron ions or aluminum ions. An elution tank, and supply means for supplying iron ions or aluminum ions eluted in the elution tank to the treatment tank,
The sedimentation part is partitioned from the aerobic part by a partition wall, and the disinfection part is provided on the top of the sedimentation part,
The drain port communicates with the disinfection unit,
The elution tank is provided and the drain outlet side above said diffuser tubes within the aerobic unit,
Hydrogen generated by electrolysis is discharged from the open upper surface of the elution tank to the treatment tank, and is discharged out of the treatment tank through the drain port by air supplied from the air diffuser. Wastewater treatment equipment. A treatment tank having an anaerobic part, an aerobic part, a sedimentation part and a disinfection part, a drain outlet for draining treated water treated in the treatment tank to the outside of the treatment tank, and an air outlet provided at the bottom of the aerobic part An air diffuser tube, an air blower for supplying air to the air diffuser tube, an electrode made of iron or aluminum, which is disposed in the treatment tank, and energizes the electrode to elute iron ions or aluminum ions. An elution tank, and a supply means for supplying iron ions or aluminum ions eluted in the elution tank to the treatment tank, wherein the precipitation part is partitioned from the aerobic part by a partition wall, and the upper part of the precipitation part is There is a disinfection part,
The drain port communicates with the disinfection unit,
The exhaust port for exhausting air in the elution vessel is provided and the drain outlet side above said diffuser tubes within the aerobic unit,
Hydrogen generated by electrolysis is discharged from the exhaust port to the treatment tank, and discharged from the treatment tank through the drain port by the air supplied from the air diffuser.   A treatment tank having an anaerobic part, an aerobic part, a precipitation part, and a disinfection part, a drain outlet for draining treated water treated in the treatment tank to the outside of the treatment tank, and an air outlet provided at the bottom of the aerobic part A diffuser tube, a blower for supplying air to the diffuser tube, and an electrode made of iron or aluminum, which is disposed in the treatment tank, and energizes the electrode to elute iron ions or aluminum ions. An elution tank and a supply means for supplying iron ions or aluminum ions eluted in the elution tank to the treatment tank, and one end of an exhaust path for exhausting air in the elution tank is connected to the elution tank, and A sewage treatment apparatus characterized in that the other end of the path is located above the air diffuser and toward the drain outlet. The sewage treatment apparatus according to any one of claims 1 to 3 , further comprising a control unit that increases an amount of air blown from the blower device every predetermined time. The sewage treatment apparatus according to any one of claims 1 to 3 , further comprising an aeration apparatus for aerating the inside of the elution tank.

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