JPH11319845A - Method and apparatus for deodorization for waste water treatment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide more powerful deodorization and sterilization using a catalytic function of a high-functional ceramics utilizing the apparatus which constantly carries out deodorization of waste water, with easiness in handling such as maintenance, and with less operational parts for such as a stirring operation. SOLUTION: In the sterilization and deodorization process for waste water treatment wherein at first the waste water is supplied in the inflow portion, subsequently passed through either of an anaerobic filtration bed tank 23a, 23b, 23c, a circulating separation tank, a precipitation separation tank, a oxidation ditch tank and finally through a disinfecting tank 32, and a framework of silica (SiO2 ) and alumina (Al2 O3 ) with 12% or more of the total content of alkali metals or alkaline earth metals is used, wherein the alkali metals or alkaline earth metals consist of the highly functional ceramic balls which are supported in the clearances in the framework. By injecting ordinary water, in an amount of 9% or more of the incoming waste water, and chlorine allowing them to contact the highly functional ceramic balls thereby raising the pH up to 6.4 or higher providing a water solution which has an oxidizing activity and this water solution is injected at least into the inflow part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing method for sewage treatment, which deodorizes and sterilizes sewage, in particular, agricultural settlement drainage, fishery settlement drainage, and public sewage by using the catalytic action of a high-performance ceramic. And the technical field of equipment.

[0002]

2. Description of the Related Art Urban sewage, agricultural effluent, and fishery effluent have a strong odor, and their treatment has been troublesome. Conventionally, for this treatment, a washing method of washing odorous gas with water or a chemical solution, an adsorption method of adsorbing on activated carbon or an ion exchange resin, a combustion method of directly burning or burning with a catalyst, and the like. , An ozone oxidation method and a biological decomposition method are known.

[0003] As a specific example, a metabolite produced by a gas-permeable anaerobic bacterium and used for purifying wastewater,
Also, as disclosed in JP-A-3-218031,
To sewage such as sewage and human urine, add humus iron salt mixed powder obtained by mixing divalent iron salts such as ferrous sulfate in the same amount as enzyme humus powder, at least 1 / 10,000 of the amount of sewage, or After diluting a humus iron complex solution in which divalent iron salts such as ferrous sulfate are dissolved in an aqueous extract of the enzyme humus powder,
A method is known in which aeration is performed by stirring, or a diluted hydrogen peroxide solution is poured and vigorously stirred to oxidatively decompose odors and deodorize.

In recent years, various high-performance ceramic balls have been developed and used for touch protection and air cleaning. Japanese Unexamined Patent Publication No. Hei 4-256419 discloses SiO ₂ , Al ₂ O ₃ , MgO as a constituent, Mn, Fe, Ti, Ca, K, Co, Cu, Cr, Ni,
A method has also been developed in which a malodorous gas is passed through a reaction tower that sprays a ceramic containing at least three of Sn, Ba, Y, and Gd and an aqueous solution of chlorine or chloric acid to deodorize.

[0005]

However, the method of producing metabolites by aerobically anaerobic bacteria has a problem in that the metabolite content is not stable, and the method of producing divalent iron such as ferrous sulfate. JP-A-3-218031 using the above salts and aqueous hydrogen peroxide
The method disclosed in Japanese Patent Application Laid-Open Publication No. H10-15095 has problems that not only is the handling of these drugs troublesome, but also that a large-scale stirring device is required.

[0006] The method disclosed in Japanese Patent Application Laid-Open No. Hei 4-256419 is a method for deodorizing odorous gas instead of wastewater, and the deodorizing effect is not sufficient.

Further, the conventional deodorizing method is for the generated gas and does not change the sewage itself. Therefore, if there is no facility for covering the whole facility outdoors, it cannot be used. There was a problem.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to stably deodorize sewage and to handle maintenance and the like without using a powerful agent such as ferrous sulfate. It is an object of the present invention to provide a deodorizing method and apparatus for sewage treatment, which is simple and has a small number of operating parts such as agitation, and has a strong deodorizing action and deodorization and sterilization.

[0009]

In order to solve the above-mentioned problems, the present invention according to claim 1 firstly injects sewage into an inflow portion, and then anaerobic filter bed tank, batch tank, and sedimentation tank. In a deodorizing method for wastewater treatment, which passes through either a separation tank or an oxidation ditch tank and finally passes through a disinfection tank to remove deodorization and sterilization, silica (SiO ₂ ) and alumina (Al) are used.
₂ O ₃ ) as a skeleton, the total content of alkali metals or alkaline earth metals is 12% or more, and the alkali metal or alkaline earth metal is a high-performance ceramic ball supported in the gaps of the skeleton. Then, 9% or more of the amount of inflowing sewage is contact-injected into the high-performance ceramic ball with chlorine and the pH is raised to 6.4 or more to form an aqueous solution having an oxidizing effect, and the aqueous solution is injected into the inflow portion This is a deodorizing method for wastewater treatment.

[0010] In order to solve the above-mentioned problems, the invention according to claim 2 is characterized in that sewage is first injected into an inflow portion, and then anaerobic filter bed tank, batch tank, sedimentation separation tank, oxidation ditch, and so on. In a deodorization method for wastewater treatment, which passes through one of the tanks and finally passes through a disinfection tank to deodorize and sterilize, in a silica (SiO ₂ ) and alumina (Al ₂ O ₃ ) skeleton,
The total content of alkali metals or alkaline earth metals is 12% or more, and the alkali metals or alkaline earth metals are high-performance ceramic balls supported in the gaps of the skeleton, and 9% or more of the inflow sewage amount. Normal water and chlorine are contact-injected into the high-performance ceramic ball to adjust the pH.
To an aqueous solution having an oxidizing effect by raising the
This is a deodorizing method for sewage treatment in which the aqueous solution is injected into an inflow portion and at least one of a sedimentation separation tank, an anaerobic filter bed tank, a batch tank, and an oxidation ditch tank.

[0011] In order to solve the above-mentioned problems, the invention according to claim 3 is characterized in that sewage is first injected into an inflow portion, and then an anaerobic filter bed tank, a batch tank, a sedimentation separation tank, and an oxidation ditch are used. Pass through any of the tanks, and finally pass through the disinfection tank to deodorize and sterilize, and pull out the sludge deposited in the sedimentation separation tank, anaerobic filter bed tank, batch tank, and oxidation ditch tank to concentrate sludge. In a deodorization method for wastewater treatment stored in a tank or a sludge concentration storage tank, silica (SiO ₂ )
And alumina (Al ₂ O ₃ ) as a skeleton, the total content of alkali metals or alkaline earth metals is 12% or more, and the alkali metal or alkaline earth metal is highly functional supported in the gaps of the skeleton. A ceramic ball, in which 9% or more of the amount of inflowing sewage is contact-injected with normal water and chlorine into the high-performance ceramic ball to raise the pH to 6.4 or more to form an aqueous solution having an oxidizing action, This is a deodorization method for sewage treatment in which an inflow portion and at least a sludge concentration tank or a sludge concentration storage tank are injected.

[0012] In order to solve the above problems, the invention according to claim 4 is characterized in that sewage is first injected into an inflow portion, and then anaerobic filter bed tank, batch tank, sedimentation separation tank, oxidation ditch, and so on. In a deodorizer for wastewater treatment that passes through one of the tanks and finally passes through a disinfection tank to deodorize and sterilize, using silica (SiO ₂ ) and alumina (Al ₂ O ₃ ) as a skeleton,
The total content of alkali metals or alkaline earth metals is 12% or more, and the alkali metals or alkaline earth metals are high-performance ceramic balls supported in the gaps of the skeleton, and 9% or more of the inflow sewage amount. Normal water and chlorine are contact-injected into the high-performance ceramic ball to adjust the pH.
To an aqueous solution having an oxidizing effect by raising the
This is a deodorizer for sewage treatment, comprising an injection device for injecting the aqueous solution into the inflow portion.

[0013] In order to solve the above-mentioned problems, the invention according to claim 5 is characterized in that sewage is first injected into an inflow portion, and then anaerobic filter bed tank, batch tank, sedimentation separation tank, oxidation ditch, and so on. In a deodorizer for wastewater treatment that passes through one of the tanks and finally passes through a disinfection tank to deodorize and sterilize, using silica (SiO ₂ ) and alumina (Al ₂ O ₃ ) as a skeleton,
The total content of the alkali metal or alkaline earth metal is 12% or more, and the alkali metal or alkaline earth metal is a high-performance ceramic ball treated by inserting a high-performance ceramic ball supported in the gap of the skeleton. Into the tank, 9% or more of the amount of inflowing sewage is contacted with normal water and chlorine from the chlorine injection device into the high-performance ceramic ball to raise the pH to 6.4 or more to form an aqueous solution having an oxidizing effect, This is a deodorizer for sewage treatment, comprising an inflow unit and an injection device for injecting at least one of an anaerobic filter bed tank, a batch tank, a sedimentation separation tank, and an oxidation ditch tank.

[0014] In order to solve the above-mentioned problems, the invention according to claim 6 is characterized in that sewage is first injected into an inflow portion, and then anaerobic filter bed tank, batch tank, sedimentation separation tank, oxidation ditch. Pass through any of the tanks, and finally pass through the disinfection tank to deodorize and sterilize, and pull out the sludge deposited in the sedimentation separation tank, anaerobic filter bed tank, batch tank, and oxidation ditch tank to concentrate sludge. In a deodorizer for wastewater treatment stored in a tank or a sludge concentration storage tank, silica (SiO ₂ )
And alumina (Al ₂ O ₃ ) as a skeleton, the total content of alkali metals or alkaline earth metals is 12% or more, and the alkali metal or alkaline earth metal is highly functional supported in the gaps of the skeleton. The high-performance ceramic ball treatment tank with the ceramic balls
9% or more of ordinary water and chlorine are contact-injected into the high-performance ceramic ball to raise the pH to 6.4 or more to form an aqueous solution having an oxidizing effect, and the aqueous solution is supplied to an inflow water channel and at least a sludge thickening tank. Or it is a deodorizer for sewage treatment provided with an injection device for injecting into a sludge concentration storage tank.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the drawings. First, referring to FIG. 1, a first agricultural settlement drainage suitable for carrying out the present invention will be described. An outline of an example of a processing apparatus that combines a anaerobic filter bed and a contact aeration, which is a processing apparatus, will be described. Sewage mixed with domestic wastewater from agricultural settlements or fishing settlements
Is transferred to the inflow section 12, where the endless screen rotates to remove large contaminants in the inflowing sewage by the automatic coarse screen 13 (slits with a width of 30mm to 50mm) to prevent pipe blockage and pump failure And then aeration sand tank 1
Flow into 4. The aeration settling tank 14 releases air into sewage by an aeration blower 15 to perform aeration (explosion), and also sets a sediment on the bottom of the aeration settling tank 14 so that sediment does not flow into the next process. The sediment is settled, and the sedimented sediment is discharged by a sedimentation discharge pump 16 and transferred to a sand basin (not shown) for storage.

The supernatant liquid of the aeration and sedimentation tank 14 flows into a raw water pump tank 17 adjacent to the aeration and sedimentation tank 14, and the wastewater in the raw water pump tank 14 from which large contaminants and soil have been removed is regulated by a pump 18. It is transferred to the tank 19.
Next, the sewage from the flow control tank 19 is fed to the automatic fine screen 21 (1) to remove a small mixture in the inflow sewage.
sewage flow meter 2
While measuring the flow rate at 2, the fluctuation of the sewage is reduced by the pump 20 to make the flow rate of the sewage constant, and the uniformity and uniformity of the sewage thereafter are attained. 23 per room
a.

Following the anaerobic filter tank first chamber 23a, the sewage is sequentially transferred from the anaerobic filter tank second chamber 23b to the anaerobic filter tank first chamber 23c. These anaerobic filter tanks mainly play a role of sedimentation and separation of solids and the like in the inflowing sewage and removal of pollutants in the sewage by the movement of anaerobic bacteria grown on the contact material. It also functions as a denitrification tank that converts nitrate nitrogen and nitrite nitrogen in the return water from the gaseous biological reaction tank into nitrogen gas, and a biological reaction tank that reduces the amount of sludge by digestion. Further, air is aerated into the sewage of the anaerobic filter tank by the aeration blower 15, and the sludge accumulated at the bottom of the anaerobic filter tank is drawn out by the sludge pump 24,
It is transferred to the sludge concentration storage tank 25. In addition, instead of the above-mentioned sludge concentration storage tank 25, a sludge concentration tank having only a sludge concentration function by constantly removing sediment may be used.

The excess sludge accumulated in the above-mentioned sludge concentration storage tank 25 is concentrated to reduce the volume, and at the same time, the stability is maintained by increasing the fixed matter recovery rate and decreasing the solids in the desorbed liquid. The concentrated sludge is transferred to and stored in a sludge storage tank 27 by a portable pump 26, and the stored sludge is carried out by a vacuum truck or the like. At this time, the sludge concentration storage tank 2
5 and the sludge storage tank 27 also have air blown into the sludge by the aeration blower 15.

The sewage from which the pollutants have been removed in the anaerobic filter tank group is transferred to the contact aeration tank first chamber 28a and the contact aeration tank second chamber 28b. Is a biological reaction tank that removes sludge substances in sewage by repeating the above process to form a film by adhering to the surface of the contact material by aeration and stirring in a tank filled with the contact material. The sewage from which the sludge substances have been removed in the contact aeration tank group is transferred to a sedimentation tank 29, where the air is aerated by the aeration blower 15 and the suspended matter in the transfer water after treatment is stabilized. The sludge that has settled out is pulled out by a sludge pulling-out pump 30 and the sludge concentrated sedimentation tank 2
The treated water treated in most contact aeration tanks is then contacted with the following fixed concentration of chlorine in the disinfecting device 31 and treated in the disinfecting tank 32 so as not to impair hygiene and discharged.

When the discharge pipe bottom is lower than the discharge water level, a discharge pump tank (not shown) may be provided and discharged by a pump.

The high-performance ceramic ball processing tank 5, which is a characteristic part of the sewage treatment deodorizing means of the present invention, supplies treated water from the disinfecting tank 32 by a supply pump 55 and a chlorine storage device 56 by an injection pump 57. After the chlorine is injected and brought into contact with the high-performance ceramic ball 51, the inflow portion 12, the anaerobic filter tank 23, and the sludge concentration storage tank 25 are connected by the inflow control valves 55a, 55b, and 55c, which are the injection devices of the present invention. Inject into The detailed description of the high-performance ceramic ball processing tank 5 will be described later.

Next, a preferred second embodiment for carrying out the present invention will be described.
An outline of an example of a batch activated sludge type treatment apparatus, which is an agricultural settlement wastewater treatment apparatus, will be described with reference to FIG. 2, but a first agricultural settlement wastewater treatment apparatus (a combination of an anaerobic filter bed and contact aeration) will be described. The anaerobic filter tank 1st chamber 23a, the anaerobic filter tank 2nd chamber 23b, the anaerobic filter tank 3rd chamber 23 of the first apparatus
Instead of the combination of the contact aeration tank first chamber 28a and the contact aeration tank second chamber 28b, the second apparatus is a first agricultural settlement except that the second apparatus is a combination of a batch tank 34 and a sprinkling pump tank 35. Since the process is the same as that of the wastewater treatment apparatus, only the different processes will be described below, and the description of the other components will be omitted.

The batch tank 34 and the sprinkling pump tank 35 will now be described. In FIG. 2, the sewage from the flow control tank 19 is measured by the sewage flow meter 22 and the fluctuation of the sewage is reduced by the pump 20. The wastewater is transferred to a batch tank 34 to make the flow rate of the wastewater constant and to make the wastewater uniform and even thereafter. In the batch tank 34, the inflow, aeration, stirring, sedimentation, and discharge are performed in one batch.
This is a biological reaction tank in which each step is performed in one tank, and usually three to four cycles are performed per day.

The treated water from which sedimentation and separation of solids and the like in the inflowing sewage by the batch tank 34 and the pollutants in the sewage have been removed by the movement of the anaerobic bacteria grown on the contact material,
It is transferred to a watering pump tank 35 and defoamed by a water spraying device to prevent foaming generated during aeration and agitation (precipitation tank 29 is installed as necessary). Is treated in the disinfection tank 32 and discharged. In addition, instead of the sludge reduction storage tank 25 in the first apparatus, a sludge concentration tank 25a is transferred to the sludge storage tank 27 as concentrated sludge. Therefore, the high-performance ceramic ball 5
The treated water after contacting with 1 is injected into the inflow section 12, the anaerobic filter tank 23, and the sludge thickening section 25a by the flow control valves 55a, 55b, 55c, which are the injection devices of the present invention.

Further, the third preferred embodiment for implementing the present invention is as follows.
An outline of an example of a treatment apparatus which combines sedimentation separation and contact aeration, which is an agricultural settlement wastewater treatment apparatus, will be described with reference to FIG. 3, but the anaerobic filter bed of the first apparatus and contact aeration are combined. Instead, the third apparatus stabilizes the inflow load into the contact aeration tank 37 by setting the sedimentation separation tank 36 in front, so that the sludge generation amount is small and the processing performance is large even if the inflow load fluctuation is large. Does not decrease, and the flow control tank can be omitted. The other configuration is almost the same as that of the first device, and the description is omitted.

An outline of an example of a treatment apparatus using an oxidation ditch tank, which is a fourth preferred agricultural settlement drainage treatment apparatus for carrying out the present invention, will be described with reference to FIG. In place of the combination of the anaerobic filter bed, contact aeration and sedimentation tank 29, the fourth apparatus comprises an oxidation ditch tank 38, a sedimentation tank 39 and a sprinkling pump tank 35.
Since it is the same as that of the first agricultural settlement drainage treatment apparatus except for the combination with the above, only the different steps will be described below, and the description of the other components will be omitted.

Therefore, the oxidation ditch tank 38
And the sedimentation tank 39, the sewage from the flow control tank 19 is measured by the sewage flow meter 22 while the sewage fluctuation is reduced by the pump 20 to make the sewage flow rate constant. It is transferred to the oxidation ditch tank 38 for homogeneity and uniformity. In the oxidation ditch tank 38, the wastewater is usually circulated, aerated and agitated while continuously returning the sludge from the settling tank 39,
The treated water from which the pollutants in the wastewater have been removed is transferred to a sprinkling pump tank 35 and defoamed by a device for sprinkling water to prevent bubbling that occurs during aeration and agitation to contact a certain concentration of chlorine. It is treated and discharged in the disinfection tank 32 so that there is no problem in hygiene.

Here, a high-performance ceramic ball processing tank 5 which is a characteristic part of the deodorizing means for sewage treatment of the present invention is shown in FIG.
This will be described with reference to FIG. High-performance ceramic ball processing tank 5
Is composed of two processing chambers 52a and 52b packed with high-performance ceramic balls 51, an injection part 53 for injecting processing water (normal water) from a disinfection tank 32 at a lower part, and an aqueous solution having an oxidizing action at an upper part. Into the inflow section 12, the sludge concentration storage section 26, and the sedimentation / separation tank, the anaerobic filter bed tank 23, the batch tank, or the oxidation ditch tank. Flow control valves 55a, 55b and 55c (shown in FIGS. 1 and 2) are provided as injection devices for controlling the pressure. And in the said injection | pouring part 53, the disinfection tank 32
Treated water equivalent to 9% or more of the amount of inflowed sewage from the plant, and an aqueous solution of hypochlorous acid is mixed into the treated water from the chlorine storage device 56 by controlling the flow rate by the injection pump 57, and this aqueous solution is treated in the treatment tank. 5 high-performance ceramic balls
51 to raise the pH of the aqueous solution to 6.4 or higher to obtain an aqueous solution having an oxidizing effect. In addition, ball stoppers 58a and 58b are provided in the inflow portion 12 and the delivery portion 54, and an air vent valve 59 is provided above the ceramic ball processing tank 5.

The above-mentioned high-performance ceramic ball processing tank 5
The high-performance ceramic balls used for silica are silica (SiO ₂ )
And alumina (Al ₂ O ₃ ) as a skeleton, the total content of alkali metals or alkaline earth metals is 12% or more, and the alkali metal or alkaline earth metal is a highly functional material supported in the gaps of the skeleton. It must be a conductive ceramic ball.

The high-performance ceramic ball treatment tank 5 is supplied with clean treated water equivalent to 9% of the amount of inflowed sewage from the disinfecting tank 21 and is supplied with chlorine (Cl ₂₎ from the chlorine injecting device 51 for free chlorine. ) Is supplied with treated water to a concentration of 0.5 to 2.0 PPM. As a result, it is necessary to raise the pH of the treated aqueous solution to 6.4 or more, as described later.

Here, the composition and structure of the high-performance ceramic balls used in the examples and comparative examples of the present invention will be described. Of the following materials 1 to 4, Tables 2 to 5 below
According to the experimental results shown in (1), Sample 1 and Sample 2 had a deodorizing effect on sewage, but Samples 3 and 4 did not have a deodorizing effect on sewage.

[0032]

[Table 1] Main chemical components of high-performance ceramic balls (unit%) Composition element Na K Ca Mg Si Al Fe Mn Sample 1 2.40 1.40 0.60 7.48 27.7 21.1 12.0 10.1 Sample 2 2.40 9.64 3.86 0.60 46.6 18.9 2.86-Sample 3 -3.52 2.16-32.2 42.5 12.8-Sample 4 0.22 9.26 0.89-51.3 35.0 2.04 0.21 Composition element Zr Ti Sr Other Alkali component Sample 1---17.2 Approx. 12% Sample 2 13.0--2.1 Approx. 17% Sample 3 1.0 5.52 0.30 0.0 About 6% Sample 4-0.53-0.55 About 10%

The above components were measured by X-ray fluorescence analysis. From these measurement results, for alkali (Na, K) metals and alkaline earth (Ca, Mg) metals in the above composition, the sum of the contents of these metal oxides was determined as Sample 1
Was about 12%, about 17% in sample 2, about 6% in sample 3, and about 10% in sample 4.

The high-performance ceramic balls of Samples 1 and 2 were cut by a diamond cutter and observed with a scanning electron microscope (SEM) at a magnification of several tens to several hundred thousand times. It was found that both the intermediate part and the surface part were porous and had a solid crystal structure. In addition, an electron beam microanalyzer (EPM
When the sample is irradiated with (A), FIG. 6 (A) (B) (C), FIG. 7 (A) (B) (C)
As can be seen from the middle part to the surface layer, alkali (Na, K) metal and alkaline earth (Ca, Mg) metal are contained a lot, and silica (SiO ₂ ) and alumina (Al ₂ O ₃ ) It is observed that the skeleton forms an extremely tough and stable crystal structure, and an alkali metal or an alkaline earth metal is supported in the gaps. On the other hand, Samples 3 and 4 have very little alkali (Na, K) metal and alkaline earth (Ca, Mg) metal.

Next, the present inventors have found that the high-performance ceramic balls of Samples 1 and 2 have a deodorizing effect by a sensory test described below. The reason is analyzed as follows. It is thought that it is something.

That is, as shown in FIG. 8, the high performance of the above-mentioned data 1 (diameter 25 mm) and data 2 (diameter 15 mm) was added to 100 CC of a 1 ppm free chlorine solution whose pH was adjusted to about 5.5 with an acetate buffer. When one ceramic ball is inserted and the change in the pH of the solution is tracked, the pH of the solution gradually increases. At this time, when a large amount of high-performance ceramic balls are charged, the degree of increase becomes larger, and reaches around pH 8.3 in a short time.

As described above, the pH of the solution increases because the oxides of alkali (Na, K) metal and alkaline earth (Ca, Mg) metal react with water from the high-performance ceramic balls. This is for indicating alkaline (OH ⁻ ), for example, Na ₂
In the case of O and CaO, as shown in the following equations (1) and (2)
This is because OH ^- is generated.

[0038]

## EQU1 ## Na ₂ O + H ₂ O 2Na ⁺ + 2OH ⁻ (1)

[0039]

## EQU2 ## CaO + H ₂ O Ca ²⁺ + 2OH ⁻ (2)

The above-mentioned elution of the alkali metal or alkaline earth metal ions was confirmed also by the fact that the degree of detection of the eluted metal ions increased with time by inductively coupled plasma (IPC) emission spectrometry.

The deodorizing action of the high-performance ceramic ball utilizes a chemical reaction that occurs in an aqueous solution containing free chlorine, as represented by tap water. That is,
Chlorine in the aqueous solution is present as a chemical species of chlorine (Cl ₂ ) hypochlorous acid (HClO) and hypochlorite ion (ClO ⁻ ) according to the numerical value of pH. Low
Mostly present as Cl ₂ at pH, H
When the percentage of ClO increases and the pH is between 4 and 5, only HClO is present,
Further HClO and ClO the pH is raised ^- coexist, C is at pH8 or
lO ^- only. Here, when Cl ₂ is dissolved in water, the following oxidation-reduction disproportionation reaction (in this case, the oxidation number of Cl is disproportionated from 0 to +1 and -1) occurs, maintaining the equilibrium state .

[0042]

## EQU3 ## Cl ₂ + H ₂ O 2H ⁺ + Cl ⁻ + HClO (3)

If the pH of the solution is alkaline, all Cl ₂ is disproportionated as follows:

[0044]

Equation 4] _{^{Cl 2 + 2OH - Cl - +}} ClO - + H 2 O (4)

[0045] ClO produced above ^- functions as an oxidizing agent having a strong oxidizing action. This is because in aqueous solutions containing free chlorine, the eluted alkali metal or alkaline earth metal ions increase, and the pH of the solution becomes alkaline (OH ^- is generated), which reacts with free chlorine (Cl ₂ ). And a strong oxidizing agent (ClO ⁻ ) is formed.
Hypochlorous acid (HClO) generated by the above formula (3) is a weak acid (acid dissociation constant (pKa) = 7.46) that exists only as an aqueous solution, is unstable, decomposes by releasing oxygen, and is decomposed by the following formula (5) (6) Produces chlorine and chloric acid (HClO ₃ ).

[0046]

[Equation 5] 2HClO 2HCl + O ₂ (5)

[0047]

[Equation 6] 3HClO 2HCl + HClO ₃ (6)

The decomposition in the above formula is thought to be promoted by catalysts such as temperature, light, ions such as platinum, manganese, nickel, cobalt, copper, iron and oxides thereof, and Solutions of chlorates (especially salts of Na, Ca, etc.), like HClO, can be decomposed by temperature, light, platinum black, manganese, nickel, cobalt, copper, iron and other ions and their oxides. Promoted by a suitable catalyst. Also, solutions of hypochlorite (especially salts of Na, Ca, etc.) are unstable and gradually decompose similarly to HCIO, and the decomposition rate is also light, platinum black, temperature, pH, glass fragments, Various catalysts
(Many heavy metals and their oxides or hydroxides)
In particular, decomposition in an alkaline solution is rapid, and the reaction of the following formula (7) occurs.

[0049]

[Equation 7] _{^{2ClO - 2Cl - + O 2 (}} 7) [2Na
CIO 2NaCl + O ₂ ]

The contents of the theory of the deodorizing action described above can be summarized in the following order of 1 to 4 steps. 1. High-performance ceramic balls elute alkali metal and alkaline earth metal ions in aqueous solution. 2. As the ions elute, the pH of the aqueous solution rises, indicating alkaline. 3. Chlorine present in aqueous solutions produces hypochlorous acid and its salts in alkaline solutions. 4. The generated hypochlorous acid and its salt are accelerated to be decomposed into oxygen and chloride ions by a catalyst (dissolved metal ions, metal oxides, hydroxides, etc.). The present inventors have elucidated from the above-described experiments and the like that the theory of the deodorizing action of the high-performance ceramic balls of Samples 1 and 2 is as described above.

By placing the high-performance ceramic balls of Samples 1 and 2 in an aqueous solution containing chlorine, hypochlorous acid (HCIO), hypochlorite ion (CIO ⁻ ) and oxygen (O ₂ ) The strong oxidizing action occurs, deodorizing, bleaching, decolorizing, sterilizing, or decomposing inorganic and organic substances,
It is effective in significantly reducing SS, BOD, COD, TN, and TP. For example, i) sulfur, hydrogen sulfide, sulfur dioxide → sulfuric acid (H ₂ SO ₄ ) ii) phosphorus, hydrogen hydride → phosphoric acid (H ₃ PO ₄ ) iii) arsenic, arsenic hydroxide → arsenic acid (H ₃ AsO ₄ ) iV) Ammonia and its compounds → chloramine (NCl
₃ ), N ₂ V) aldehyde, ketone compound → carboxylic acid (RCOO)
It can be oxidized as in H) and treated as a detoxified and stabilized form.

Next, in comparison with Sample 1 and Sample 4 described above, the conditions for using the high-performance ceramic balls in implementing the present invention will be described. [Experimental Example 1] The amount of inflow of sewage into agricultural villages was determined by the agricultural village drainage facility design guidelines (Japan Agricultural Village Drainage Association, 1996
According to P37), which is set at 0.27m ³ / person per day, for example, the inflow of sewage into 950 agricultural villages is

[0053]

[Number 8 950 people × 0.27m ³ / person = 256.5m ³

In this experimental example, the same flow rate was set, and the amount of water flowing into the high-performance ceramic ball processing tank 5 was 9% of the amount of wastewater flowed into the inflow section. Furthermore, an amount corresponding to 1% of the inflow of sewage is continuously (but may be intermittently injected, but the interval must be as short as possible) into the anaerobic filter tank and the sludge concentration storage tank. Was injected.

[0055]

[Equation 9] 256.5m ³ × 0.1 = 25.65m ³

The amount of water flow per hour is

[0057]

[Equation 10] 25.65m ³ ÷ 24h = 1.06875m ³ / h

Is as follows. Here, sample 1, sample 2, sample 3, and sample 4 were put into the high-performance ceramic ball processing tank 5, and the sensory test of the ph value in the processing tank 5 and the smell of the processing water passed through the disinfection tank were performed. Are shown in Tables 2 to 5. In addition, the sensory test of smell is judged whether or not five normal males felt the smell, and 2 to 4 people felt it, and 5 people felt it. The case where it was not felt was indicated by ○.

[0059]

[Table 2] Sample 1 15Kg 20Kg 25Kg 30Kg 35Kg 40Kg (alkaline component about 12%) pH 5.9 6.2 6.4 6.7 6.9 6.9 7.1 Odor △ △ ○ ○ ○ ○

[0060]

[Table 3] Sample 2 15Kg 20Kg 25Kg 30Kg 35Kg 40Kg (alkaline component about 17%) pH 6.1 6.6 7.1 7.5 7.8 8.1 Odor △ ○ ○ ○ ○ ○

[0061]

[Table 4] Sample 3 15Kg 20Kg 25Kg 30Kg 35Kg 40Kg (alkaline component about 6%) pH 5.6 5.7 5.8 5.8 5.8 5.8 5.8 Odor × × × × × ×

[0062]

[Table 5] Sample 4 15Kg 20Kg 25Kg 30Kg 35Kg 40Kg (alkaline component about 10%) pH 5.6 5.7 5.8 5.9 5.9 5.9 Odor × × × △ △ △

From the above results, under the above-mentioned [experiment conditions], Samples 3 and 4 having an alkali component of about 10% or less had almost no deodorizing effect, and the alkali component contained 12% to obtain a deodorizing effect on sewage. It is necessary that the pH is 6.4 or higher, and if many samples 1 and 2 are used,
It can be seen that the pH also increases.

[Experimental Example 2] The amount of inflow of sewage in an agricultural settlement is set at 0.27 m ³ / person / day, as in Experiment Example 1. Therefore, for example, the amount of inflow of sewage in an agricultural settlement of 950 people Is

[0065]

[Number 11] 950 people × 0.27m ³ / person = 256.5m ³

Using 25 kg of the high-performance ceramic balls of Samples 1 and 2, the amount of water flowing into the high-performance ceramic ball treatment tank 5 was 7%, 8%, 9% of the inflow of sewage.
%, 10%, 12%, and 15%, and the other conditions were the same as those in [Experimental Example 1], and the odor sensory test was also the same. The results of the sensory test are shown in Tables 6 and 7 below.

[0067]

[Table 6] Sample 1 7% 8% 9% 10% 12% 15% 18% 20% (alkaline component about 12%) pH 5.9 6.2 6.4 6.5 6.6 6.7 6.7 6.7 odor × △ ○ ○ ○ ○ ○ ○

[0068]

[Table 7] Sample 2 7% 8% 9% 10% 12% 15% 18% 20% (about 17% of alkaline component) pH 6.1 6.4 6.6 6.7 6.8 6.9 6.9 7.0 7.0 Odor △ ○ ○ ○ ○ ○ ○ ○

From the above results, when the high-performance ceramic balls of Samples 1 and 2 were used, at least 9% of the amount of inflowed sewage was required to obtain a deodorizing effect on sewage.
The treated water that has passed through the above disinfection tank is required. Also, 15
%, The increase in pH slows down, and from a cost-effective perspective,
The treated water that has passed through the disinfection tank is preferably
~ 15% is good. Further, the above-mentioned treated water may be ordinary water containing no foreign matter, and in FIG.
Of course, the treated water may be expensive, but the cost is high, but it goes without saying that clean water may be used.

Next, the injection amount of the anaerobic filter tank in the treated water in the high-performance ceramic ball processing tank will be described. In this case, the amount of water flowing into the high-performance ceramic ball processing tank 5 is set to an amount equivalent to 9% of the inflow of sewage into the inflow section 1.
2 and the amount of injection into the anaerobic filter tanks 23a, 23b, 23c is as follows:
As shown in Tables 8 and 9, the amount of 0.3 to 2.5% of the wastewater inflow was continuously injected.

[0071]

[Table 8] Sample 1 0.0% 0.3% 0.5% 1.0% 1.5% 2.0% 2.5% (pH 6.4) Odor △ △ ○ ○ ○ ○ ○

[0072]

[Table 9] Sample 2 0.0% 0.3% 0.5% 1.0% 1.5% 2.0% 2.5% (pH6.6) Odor △ △ ○ ○ ○ ○ ○

In the above embodiment, if 0.5% or more of the treatment water in the high-performance ceramic ball treatment tank is injected into the anaerobic filter bed tank, the odor is completely removed. Since the effect is almost the same even when 1.5% or more, the injection amount into the aeration sand tank is preferably 0.5 to 1.5% of the inflow of sewage. This means that, in a system other than the system using the anaerobic filter bed, almost the same test results were obtained in the batch tank, the sedimentation separation tank, and the oxidation ditch tank.

Further, the injection amount of the anaerobic filter tank in the treated water in the high-performance ceramic ball processing tank will be described. In this case, the amount of water flowing into the high-performance ceramic ball processing tank 5 is set to an amount equivalent to 9% of the inflow of sewage into the inflow section 1.
2 and the amount of injection into the sludge concentration storage tank 25 is continuously injected in an amount of 0.3 to 2.5% as shown in Tables 10 and 11 with respect to the amount of inflow of sewage, and the odor in the sludge concentration storage tank 25 is Was subjected to a sensory test.

[0075]

[Table 10] Sample 1 0.0% 0.3% 0.5% 1.0% 1.5% 2.0% 2.5% (pH 6.4) Odor △ △ △ ○ ○ ○ ○

[0076]

[Table 11] Sample 2 0.0% 0.3% 0.5% 1.0% 1.5% 2.0% 2.5% (pH 6.6) Odor △ △ △ ○ ○ ○ ○

In the above embodiment, 1.0% or more of the treated water in the high-performance ceramic ball treatment tank is
Injection into 5 completely eliminates the odor. Since the effect is almost the same even when 2.0% or more, the injection amount into the sludge concentration storage tank 25 is preferably 1.0 to 2.0% of the wastewater inflow amount. This means that almost the same test results can be obtained in the sludge concentration and storage tank 25 using the batch tank, the sedimentation separation tank, and the oxidation ditch tank other than the system using the anaerobic filter tank. Concentration storage tank 2
Substantially the same test results were obtained when the sludge thickening tank 25a was used instead of 5.

It is needless to say that the present invention is not limited to the above embodiment unless the characteristics of the present invention are impaired.

[0079]

As described above, according to the present invention, a high-performance ceramic ball suitable for deodorization is selected from expensive high-performance ceramic balls, and the high-performance ceramic ball according to the conditions of the present invention can be used in conventional sewage treatment. The deodorizing effect can be effectively obtained only by using the functional ceramic balls. In particular, according to the invention described in claims 2, 3, 5, and 6, a relatively small amount of the treatment liquid with the high-performance ceramic ball is injected into a deodorization tank such as an anaerobic filter bed tank, whereby a more effective effect is obtained. A deodorizing effect can be obtained. In addition, since the sewage itself is altered, even if the treatment facility does not have a facility that covers the entire facility outdoors, a deodorizing effect can be effectively obtained for the sewage without using a large stirring device or the like. Things.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing the flow of an example of a processing apparatus combining a anaerobic filter bed and contact aeration suitable for use in the present invention.

FIG. 2 is a diagram schematically showing the flow of an example of a batch activated sludge type treatment apparatus suitable for use in the present invention.

FIG. 3 is a diagram schematically showing an example of the flow of a processing apparatus combining precipitation separation and contact aeration suitable for use in the present invention.

FIG. 4 is a view schematically showing a flow of an example of an oxidation ditch tank type processing apparatus suitable for use in the present invention.

FIG. 5 shows a high performance ceramic ball processing tank of the present invention.
It is a figure explaining the outline of an example.

FIG. 6 is a graph of a result of EPMA measurement of a high-performance ceramic ball of Sample 1, and FIG.
(B) is a graph of a measurement result in an intermediate part, and (C) is a graph of a measurement result in a surface part.

FIG. 7 is a graph of a measurement result of EPMA of a high-performance ceramic ball of Sample 2; FIG.
(B) is a graph of a measurement result in an intermediate part, and (C) is a graph of a measurement result in a surface part.

FIG. 8 is a graph of the change over time of pH due to the treatment of the high-performance ceramic ball of the example in the present invention.

FIG. 9 is a graph showing the distribution of Cl _{2 according to} the pH after the treatment of the high-performance ceramic ball of the example in the present invention.

[Explanation of symbols]

 11… Pipe line 12… Inlet 13… Automatic coarse screen 14… Aeration sand tank 15… Aeration blower 16… Sand discharge pump 17… Raw water pump tank 18… Raw water pump 19… Flow control tank 20… Pump 21… Auto Fine screen 22 ... Sewage flow meter 23a ... Anaerobic filter tank 1st chamber 23b ... Anaerobic filter tank 2nd chamber 23c ... Anaerobic filter tank 3rd chamber 24 ... Sludge pump 25 ... Sludge concentration tank 25a ... Sludge thickening tank (Fig. 2) 26 ... Sludge pump 27 ... Sludge storage tank 28a ... Contact aeration tank first chamber 28b ... Contact aeration tank second chamber 29 ... Sedimentation tank 30 ... Sludge extraction pump 31 ... Disinfector 32 ... Disinfection Tank 34: Batch tank 35 ... Sprinkling pump tank 31 ... Disinfector 32 ... Disinfection tank 34 ... Batch tank (Fig. 2) 35 ... Sprinkling pump tank (Fig. 2) 36 ... Sedimentation separation tank (Fig. 3) 37 ... Contact aeration tank (Fig. 3) 38 ... Oxidation ditch tank (Fig. 4) 36 ... Precipitation tank (Fig. 4) 5 ... Highly functional ceramic ball processing tank 51 ... Highly functional ceramic Kkuboru 52a, 52 b ... processing chambers 53 ... injection portion 54 ... sending unit 55 ... feed pump 55a, 55b, 55c ... flow control valve 56 ... chlorine storage device 57 ... injection pumps 58a, 58b ... Ball plug 59 ... Air vent valve

[Procedure amendment]

[Submission date] March 2, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003] As a specific example, a metabolite produced by a gas-permeable anaerobic bacterium and used for purifying wastewater,
Also, as disclosed in JP-A-5-38498 ,
To sewage such as sewage and human urine, add humus iron salt mixed powder obtained by mixing divalent iron salts such as ferrous sulfate in the same amount as enzyme humus powder, at least 1 / 10,000 of the amount of sewage, or After diluting a humus iron complex solution in which divalent iron salts such as ferrous sulfate are dissolved in an aqueous extract of the enzyme humus powder,
A method is known in which aeration is performed by stirring, or a diluted hydrogen peroxide solution is poured and vigorously stirred to oxidatively decompose odors and deodorize.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

However, the method of producing metabolites by aerobically anaerobic bacteria has a problem in that the metabolite content is not stable, and the method of producing divalent iron such as ferrous sulfate. The above-mentioned JP-A-5-38498 using salts or aqueous hydrogen peroxide
The method disclosed in Japanese Patent Application Laid-Open Publication No. H10-15095 has problems that not only is the handling of these drugs troublesome, but also that a large-scale stirring device is required.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

The supernatant liquid of the aerated sedimentation tank 14 flows into a raw water pump tank 17 adjacent to the aerated sedimentation tank 14, and the sewage of the raw water pump tank 14 from which large contaminants and soil have been removed is pumped by a pump 18. Transferred to 19. Next, the sewage from the flow control tank 19 is fed to an automatic fine screen 21 (1 mm) to remove a small mixture in the inflow sewage.
Through a slit with a width of ~ 2.5 mm)
The anaerobic filter tank group 23 of the anaerobic filter tank group 23 is designed to make the sewage flow rate constant by reducing the fluctuation of the sewage by the pump 20 while maintaining the sewage flow rate constant. Room 23a
Is transferred to

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction contents]

Following the anaerobic filter tank first chamber 23a, the sewage sequentially flows from the anaerobic filter tank second chamber 23b to the anaerobic filter tank first.
It is transferred to the third room 23c. These anaerobic filter tanks mainly play a role of sedimentation and separation of solids and the like in the inflowing sewage and removal of pollutants in the sewage by the movement of anaerobic bacteria grown on the contact material. It also functions as a denitrification tank that converts nitrate nitrogen and nitrite nitrogen in the return water from the gaseous biological reaction tank into nitrogen gas, and a biological reaction tank that reduces the amount of sludge by digestion. The sludge collected at the bottom of the anaerobic filter tank is drawn out by a sludge pump 24 and transferred to a sludge concentration storage tank 25. In addition, instead of the above-mentioned sludge concentration storage tank 25,
A sludge thickening tank having only a sludge thickening function by constantly removing the sediment may be used.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0030

[Correction method] Change

[Correction contents]

The high-performance ceramic ball processing tank 5 is supplied with clean treated water equivalent to 9% of the amount of inflowed sewage from the disinfecting tank 32, and is supplied with chlorine (Cl ₂ ) from a chlorine injection device for free chlorine. Must be supplied with treated water to a concentration of 0.5 to 2.0 PPM. As a result, it is necessary to raise the pH of the treated aqueous solution to 6.4 or more, as described later.

[Procedure amendment 7]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C02F 1/00 ZAB C02F 1/00 ZABF 3/14 3/14 3/30 3/30 B 11/00 11/00 F

Claims (6)

[Claims] The wastewater is first injected into the inflow section, then passed through an anaerobic filter tank, batch tank, sedimentation separation tank, oxidation ditch tank, and finally through a disinfection tank. In the deodorizing method for wastewater treatment, which deodorizes and sterilizes, the total content of alkali metals or alkaline earth metals is based on silica (SiO ₂ ) and alumina (Al ₂ O ₃ ).
At least 12% of the alkali metal or alkaline earth metal is a high-performance ceramic ball supported in the gaps of the skeleton, and normal water and chlorine of 9% or more of the amount of inflowed sewage are mixed with the high-performance ceramic ball. Inject contact into the ball and adjust the pH
A deodorizing method for sewage treatment, comprising raising an aqueous solution having an oxidizing action by raising it to 6.4 or more and injecting it into an inflow portion. 2. The sewage is first injected into the inflow section, then passed through an anaerobic filter tank, batch tank, sedimentation tank, oxidation ditch tank, and finally through a disinfection tank. In the deodorizing method for wastewater treatment, which deodorizes and sterilizes, the total content of alkali metals or alkaline earth metals is based on silica (SiO ₂ ) and alumina (Al ₂ O ₃ ).
At least 12% of the alkali metal or alkaline earth metal is a high-performance ceramic ball supported in the gaps of the skeleton, and normal water and chlorine of 9% or more of the amount of inflowed sewage are mixed with the high-performance ceramic ball. Inject contact into the ball and adjust the pH
6.4 to raise the aqueous solution having an oxidizing effect, the aqueous solution and the inflow portion, at least anaerobic filter tank, batch tank,
A deodorizing method for sewage treatment, characterized by injecting into a sedimentation separation tank or an oxidation ditch tank. 3. The sewage is first injected into an inflow portion, then passed through an anaerobic filter tank, a batch tank, a sedimentation separation tank, or an oxidation ditch tank, and finally passed through a disinfection tank. , Deodorization, sterilization, anaerobic filter tank, batch tank,
In a sedimentation separation tank, a deodorization method for drainage treatment in which sludge precipitated in an oxidation ditch tank is drawn out and stored in a sludge concentration tank or a sludge concentration storage tank, silica (SiO ₂ ) and alumina (Al ₂ O ₃ ) are used as a skeleton. When the total content of alkali metals or alkaline earth metals is 12% or more,
The alkali metal or alkaline earth metal is a high-performance ceramic ball supported in the gap of the skeleton, and normal water and chlorine of 9% or more of the amount of inflowing sewage are contact-injected into the high-performance ceramic ball. And increasing the pH to 6.4 or more to form an aqueous solution having an oxidizing effect, and injecting the aqueous solution into the inflow portion and at least into the sludge concentration tank or the sludge concentration storage tank. 4. The sewage is first injected into the inflow section, then passed through an anaerobic filter tank, batch tank, sedimentation separation tank, oxidation ditch tank, and finally through a disinfection tank. In a deodorizing apparatus for wastewater treatment, which deodorizes and sterilizes, the total content of alkali metals or alkaline earth metals is based on silica (SiO ₂ ) and alumina (Al ₂ O ₃ ).
At least 12% of the alkali metal or alkaline earth metal is a high-performance ceramic ball supported in the gaps of the skeleton, and normal water and chlorine of 9% or more of the amount of inflowed sewage are mixed with the high-performance ceramic ball. Inject contact into the ball and adjust the pH
A deodorizing device for sewage treatment, comprising: an injection device for raising an aqueous solution having an oxidizing action by raising the aqueous solution to 6.4 or more, and injecting the aqueous solution into an inflow portion. 5. The sewage is first injected into an inflow portion, then passed through an anaerobic filter tank, a batch tank, a sedimentation separation tank, or an oxidation ditch tank, and finally passed through a disinfection tank. In a deodorizing apparatus for wastewater treatment, which deodorizes and sterilizes, the total content of alkali metals or alkaline earth metals is based on silica (SiO ₂ ) and alumina (Al ₂ O ₃ ).
12% or more, the alkali metal or alkaline earth metal is placed in a high-performance ceramic ball processing tank into which a high-performance ceramic ball supported in the gap of the skeleton is inserted,
Normal water of 9% or more of water inflowing sewage and chlorine from the chlorine injection device are contact-injected into the high-performance ceramic ball to raise the pH to 6.4 or more to form an aqueous solution having an oxidizing action, and An inflow part, at least an anaerobic filter tank,
A deodorizer for sewage treatment, comprising an injection device for injecting into any of a batch tank, a sedimentation separation tank, and an oxidation ditch tank. 6. The sewage is first injected into the inflow section, then passed through an anaerobic filter tank, batch tank, sedimentation tank, oxidation ditch tank, and finally through a disinfection tank. , Deodorization, sterilization, anaerobic filter tank, batch tank,
In a sedimentation separation tank, a deodorizer for wastewater treatment in which sludge precipitated in an oxidation ditch tank is drawn out and stored in a sludge concentration tank or a sludge concentration storage tank, silica (SiO ₂ ) and alumina (Al ₂ O ₃ ) are used as a skeleton. When the total content of alkali metals or alkaline earth metals is 12% or more,
The alkali metal or alkaline earth metal is introduced into a high-performance ceramic ball treatment tank into which a high-performance ceramic ball held in the gap of the skeleton is inserted, and 9% of the amount of sewage flowing into the tank is treated.
The above normal water and chlorine are contact-injected into the high-performance ceramic ball to raise the pH to 6.4 or more to obtain an aqueous solution having an oxidizing effect, and the aqueous solution is inflowed into at least a sludge thickening tank or sludge thickener. A deodorizing device for sewage treatment, comprising an injection device for injecting into a storage tank.