JP3159394B2 - Method and apparatus for treating pesticides and wastewater containing nitrogen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating agricultural chemicals and wastewater containing nitrogen.

[0002]

2. Description of the Related Art For example, wastewater from golf courses contains nitrogen from pesticides and nitrogen fertilizers. Since this wastewater has high biotoxicity of pesticides, it uses a biological method which is an economical treatment method. No processing has been performed. That is, conventionally, the treatment of wastewater containing pesticides, instead of utilizing biological methods, adsorption treatment with activated carbon or charcoal, so-called physical treatment is generally performed, along with such physical treatment, No treatment of the nitrogen content in the wastewater has been performed. As a conventional general method for treating nitrogen in wastewater, there is a treatment method in which a hydrogen donor such as methanol is added to wastewater and biological treatment is performed in an anaerobic tank and an aerobic tank. .

[0003]

In the treatment of pesticides using physical treatment, the adsorbent such as the activated carbon and charcoal has a limited adsorption life, and the adsorption equipment requires a large amount of space and construction costs. And not economical. In a golf course, a large amount of nitrogen fertilizer is used for greens and the like, which flows out into a regulating pond together with rainwater, and unless the nitrogen content in the wastewater is treated, algae and algae are generated in the regulating pond, which is not aesthetically preferable. Even if such a nitrogen content treatment is performed using a conventional general denitrification treatment method, in the conventional method, together with a treatment tank satisfying the anaerobic condition and a treatment tank satisfying the aerobic condition, hydrogen is supplied. A large investment is required for the construction cost of the body addition equipment, etc., which is not economical.

[0004] The present invention focuses on the pesticide decomposing ability and denitrifying ability of BSK bacteria, which are recently known as bacteria for treating sewage and the like. It is an object of the present invention to solve the above-described problem by performing a minute process. (In addition, BS
Regarding K bacteria, see, for example, JP-A-1-144971. )

[0005]

Means for solving the above problems will be described. First, the present invention provides a first processing tank 5 filled with an aerobic immobilization carrier 13 in an aerated state. And a second treatment step performed in an aerated state in a second treatment tank 6 filled with a carbonaceous filler 15 in which BSK bacteria have been immobilized in advance, and the aerobic and anaerobic coexisting immobilization carriers 14 are filled. And a third treatment step performed in an aerated state in the third treatment tank 7 in order to treat the wastewater.

The present invention also relates to the above-mentioned treatment method, wherein the treated water treated in the third treatment tank 7 is discharged to a biological monitoring tank 16 in which creatures such as fish are bred to monitor the wastewater containing pesticides and nitrogen. Is provided.

The present invention provides a first treatment tank 5 in which an aerobic immobilization carrier 13 is filled in a tank provided with aeration means, and a carbonaceous packing in which BSK bacteria are fixed in advance in a tank provided with aeration means. A second treatment tank 6 filled with a material 15 and a third treatment tank 7 filled with an aerobic and anaerobic coexisting immobilization carrier 14 in a tank provided with aeration means, and the wastewater is first A treated water supply means for supplying the treated water of the first treatment tank 5 to the second treatment tank 6 and the treated water of the second treatment tank 6 to the third treatment tank 7 The present invention provides an apparatus for treating agrochemical and nitrogen-containing wastewater, comprising a treated water supply means for carrying out the treatment and a treated water discharge means for discharging the treated water from the second treatment tank 6 to an appropriate place.

Further, the present invention provides the above-mentioned treatment apparatus, wherein the treatment water in the third treatment tank 7 is discharged to the biological monitoring tank 16 in which the creatures are bred. provide.

In the above-described processing method or processing apparatus, the aerobic immobilized carrier 13 filled in the first processing tank 5 is used.
Is preferably a calcium-containing filler.

In the processing method or the processing apparatus described above, the aerobic and anaerobic coexisting immobilization carrier 14 to be filled in the third processing tank 7 is provided with the radial annular filament of polyvinylidene chloride in the longitudinal direction. It is preferable to use an integrated filler.

Further, in the above-mentioned processing method or processing apparatus, the carbonaceous filler 15 to be filled in the second processing tank 6 comprises:
It is preferred to use charcoal, molded charcoal, or activated carbon.

[0012]

The wastewater supplied into the first treatment tank 5 is treated by aerobic microorganisms that propagate on the aerobic immobilization carrier 13 in an aerated state, and mainly comprises BOD, COD and SS.
Is removed, and the visibility is improved. In the first processing section, a part of the processing of the pesticide is also performed.

Next, when the treated water treated in the first treatment tank 5 is supplied into the second treatment tank 6, the BSK which propagates well on the carbonaceous filler 15 in the second treatment tank 6 in an aerated state.
The fungus efficiently decomposes mainly pesticides in the treated water with the same action as the bioreactor. In other words, BSK bacteria have a processing ability of BOD, COD, etc., in addition to pesticides, but since these BODs, CODs, etc. are preliminarily treated in the first treatment section, the decomposition treatment of the pesticides is accordingly much more. It is done efficiently. Thus, the processing in the first processing tank 5 is an effective pre-processing of the processing in the second processing tank 6.

On the other hand, since the carbonaceous filler 15 immobilizing the BSK bacteria has a physical adsorption effect on itself, pesticides are removed from the treated water by the physical adsorption effect. Combined with the decomposition treatment, the treatment of pesticides is powerful. In addition, even when the BSK bacteria are not sufficiently adapted, as in the running-in period immediately after the start of the treatment, and thus the decomposition treatment is weak, the treatment of the pesticide can be performed by the physical adsorption of the carbonaceous filler 15 itself. It is done reliably.

The treated water in which the pesticide has been treated in the second treatment tank 6 is then supplied to the third treatment tank 7, and BSK bacteria are supplied therewith. Since the inside of the third treatment tank 7 is also in an aerated state, the supplied BSK bacteria are immobilized on the aerobic portion of the aerobic and anaerobic coexisting immobilization carrier 14 and propagate. On the other hand, anaerobic microorganisms propagate in the anaerobic portion of the immobilized carrier. Therefore, the treated water supplied from the second treatment tank 6 is denitrified by the action of both the anaerobic microorganism and the BSK bacteria, and the nitrogen content is efficiently removed. Such denitrification treatment is performed on the treated water in which the pesticide has been treated in the second treatment tank 6, so that it is efficiently carried out.

In the above treatment, if a calcium-containing filler such as oyster hulls is used as the aerobic immobilization carrier 13 to be filled in the first treatment tank 5, the SS in the wastewater can be more favorably treated. In addition, the visibility of the treated water can be further improved.

Further, if a filling material formed by accumulating radially annular filaments of polyvinylidene chloride in the longitudinal direction is used as the aerobic and anaerobic coexisting immobilization carrier 14 to be filled in the third treatment tank 7, the surface area can be reduced. Due to the large shape and the action of the negative charge of polyvinylidene chloride, the BSK bacteria and other microorganisms can be immobilized and propagated well even in wastewater with low BOD and COD concentrations.

If charcoal or molded charcoal is used as the carbonaceous filler 15 to be filled in the second treatment tank 6, the carbonaceous filler 15 treated for a predetermined period can be taken out and effectively used as fuel.

The treated water treated in the third treatment tank 7 as described above is discharged to a biological monitoring tank 16 to monitor the water quality by living organisms 18 such as fish kept there. be able to.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a system diagram showing an embodiment in which the present invention is applied to wastewater treatment of a golf course, and reference numeral 1 denotes a regulating pond. Generally, several regulating ponds 1 are provided in a golf course, and the used agricultural chemicals and nitrogen fertilizer flow into the regulating pond 1 together with rainwater. Therefore, pesticides remain in the regulating pond 1, and nitrogen fertilizer gradually accumulates at the bottom. This nitrogen fertilizer causes the occurrence of blue-green algae and algae, and is not aesthetically preferable. Therefore, the regulating pond 1 is provided with a pump tank 2 for supplying pond water as wastewater, and a pump 3 installed in the pump tank 2 is provided with a wastewater supply pipe 4 in a first treatment tank 5 described below. I have.

Reference numerals 5, 6, and 7 denote first, second, and third processing tanks, respectively.
7 is provided with aeration means. These aeration means are configured by installing an air diffuser 10 connected to an air supply pipe 9 connected to a blower 8 at a lower portion in each tank.

The first, second and third processing tanks 5, 6, 7
Is provided with a filling portion a for filling a carrier for immobilizing microorganisms and a non-filling portion b for not filling. The first, second, and third processing tanks 5, 6, and 7 are integrally formed so as to be adjacent to each other with a partition wall 11 therebetween. And the non-filled part b of the second processing tank 6 is adjacent to the filled part a of the third processing tank 7. Each of the partition walls 11 is provided with an overflow hole 12, through which the treated water in the first treatment tank 5 is supplied to the second treatment tank 6 and the treated water in the second treatment tank 6. The treatment water is supplied to the third treatment tank 7, and these constitute treatment water supply means.

In the illustrated embodiment, the first, second, and third processing tanks 5, 6, and 7 are integrally formed. However, they may be independently formed. The treated water supply means for supplying treated water from one treatment tank 5 to the second treatment tank 6 and from the second treatment tank 6 to the third treatment tank 7 is appropriately constructed by providing a pump or a supply pipe. can do.

In the above configuration, the filling section a of the first processing tank 5 is filled with the aerobic immobilization carrier 13 and the filling section a of the third processing tank 7 is mixed with aerobic and anaerobic. The immobilization carrier 14 is filled, and the filling part of the second treatment tank 6 is filled with a carbonaceous filler 15 in which BSK bacteria have been immobilized in another place in advance.

The aerobic immobilization carrier 13 can be a ceramic filler or a calcium-containing filler including such a ceramic filler. Oyster shells can be used as the calcium-containing filler.

The aerobic and anaerobic coexisting immobilization carrier 14 can use a filler made by accumulating radial annular filaments of polyvinylidene chloride in the longitudinal direction. This filler is the same as that disclosed in Japanese Patent Application Laid-Open No. 2-238835 as a microorganism growth promoter. In addition, the aerobic and anaerobic coexisting immobilization carrier 14 can have an appropriate configuration as long as a portion where the supply of oxygen by the operation of the aeration unit is sufficient and a portion where the supply of oxygen is insufficient are formed. However, the present invention is not necessarily limited to the above configuration. Of course,
The aerobic immobilization carrier 13 can also be made of an appropriate material and shape.

Further, as the carbonaceous filler 15, normal charcoal, molded charcoal, activated carbon, or the like can be used. Molded charcoal is made by pulverizing underground resources, i.e., uncharcoal (young charcoal), adding a binder as a main component, molding and firing, and producing as much as charcoal. The adsorption capacity is high, and the immobilization of microorganisms is also good. The carbonaceous filler 15 may be constituted solely of these charcoal, molded charcoal, activated carbon, or the like, or may be constituted by combining them, or may be constituted as a filler partially including these. Can also.

Reference numeral 16 denotes a biological monitoring tank, which is connected to the air supply pipe 9 as aeration means in the same manner as the first, second, and third processing tanks 5, 6, and 7. Organism 1 that can be monitored such as fish by providing the air part 17
8 is bred, and the treated water in the third treatment tank 7 is discharged into the biological monitoring tank 16. The treated water discharging means for discharging the treated water from the third treatment tank 7 as described above is provided from the first treatment tank 5 to the second treatment tank 6 or from the second treatment tank 6 to the third treatment tank 7. In the same manner as the supply of treated water to the third treatment tank 7, an overflow hole 19 is provided in the third treatment tank 7, the structure is configured to discharge by overflow through the overflow hole 19, and a structure in which a pump and a discharge pipe are provided. be able to. Therefore, the biological monitoring tank 16 can be configured independently as in the illustrated example, or can be integrally formed with the second processing tank 6.

In the above configuration, the water in the regulating pond 1 containing the pesticide and the nitrogen fertilizer is supplied from the pump tank 2 to the filling section a of the first treatment tank 5 through the waste water supply pipe 4 by the operation of the pump 3. Supplied. In the first processing tank 5, air is ejected from a lower air diffuser to generate an upward flow, and oxygen is supplied into the water while the inside of the tank is stirred by a water flow. Therefore, the inside of the first treatment tank 5 including the filling part a is maintained aerobic, and general aerobic microorganisms propagate and are fixed on the aerobic immobilization carrier 13. As such aerobic immobilization carrier 13, oyster hulls are preferred from the viewpoint of economic efficiency and the ability to improve the transparency of treated water.

In the wastewater supplied to the first treatment tank 5, organic substances serving as BOD and COD sources are decomposed by aerobic microorganisms propagated on the aerobic immobilization carrier 13, and SS is also oxidized by catalytic oxidation. It is removed and the degree of transparency is improved.
As described above, in the first processing tank 5, a part of the processing of the pesticide is also performed.

The treated water thus treated in the first treatment tank 5 is supplied to the filling section a of the second treatment tank 6 through the overflow hole 12. In the second processing tank 6,
BSK bacteria previously fixed to the carbonaceous filler 15 are propagated under aerobic conditions by aeration, and the BSK bacteria mainly degrade pesticide components such as diazinon, TPN, flutranil, and vesrosin. Such a decomposition treatment is not performed by directly supplying BSK bacteria to the wastewater in the treatment tank, but is performed by immobilizing the BSK bacteria on the carbonaceous filler 15. Decomposition can be performed. In other words, BSK bacteria have a processing ability of BOD, COD, etc., in addition to pesticides, but since these BODs, CODs, etc. are preliminarily treated in the first treatment section, the decomposition treatment of the pesticides is accordingly much more. It is done efficiently. Of course, in the second treatment tank 6, a part of the nitrogen content in the wastewater is also treated by the denitrifying action of the BSK bacteria along with the decomposition of the pesticides.

On the other hand, the carbonaceous filler 15, such as charcoal or activated carbon, on which BSK bacteria are immobilized has a physical adsorptive action by itself, so that pesticides in treated water can be removed by the physical adsorptive action. The effect of the pesticide treatment is strong in combination with the above-mentioned decomposition treatment by BSK bacteria. In addition, even when the BSK bacteria are not sufficiently adapted, as in the running-in period immediately after the start of the treatment, and thus the decomposition treatment is weak, the treatment of the pesticide can be performed by the physical adsorption of the carbonaceous filler 15 itself. It is done reliably.

When the processing capacity of the BSK bacterium and the carbonaceous filler 15 itself decreases after the predetermined treatment period has elapsed, a new carbonaceous filler in which the BSK bacterium is immobilized in another place is used. 15 may be partially replaced or entirely replaced. As the method for immobilizing the BSK bacteria, a conventional appropriate method can be applied. The carbonaceous filler 15 taken out from the filling section may be discarded, but when charcoal or the like is used, it can be reused as fuel.

The treated water treated in the second treatment tank 6 as described above is supplied to the filling portion a of the third treatment tank 7 through the overflow hole 12 and, at the same time, in the second treatment tank 6 BSK bacteria bred on the market are also supplied. In this third processing tank 7,
Oxygen is supplied into the water while the inside of the tank is agitated by the water stream generated by the air spouting from the lower aeration unit 10 as in the first and second processing tanks 6, and the portion in contact with such a water stream Is maintained aerobic, and B is applied to a corresponding portion of the aerobic and anaerobic coexisting immobilized carrier 14, that is, a surface portion of the filler.
SK bacteria are immobilized and propagate. On the other hand, since the water flow hardly comes into contact with the inside of the above-mentioned filling member, that is, the inside of the radial annular filament, this portion is maintained anaerobic. , Immobilized.

Accordingly, a part of the residual pesticide components and nitrogen content in the treated water supplied to the filling section a of the third treatment tank 7 is B
While being treated by SK bacteria, the nitrogen content is also denitrified by anaerobic microorganisms. As described above, in the third treatment tank 7, the treatment is performed on the treated water mainly treated with the pesticide in the second treatment tank 6, and the aerobic part and the anaerobic The denitrification treatment is performed efficiently by utilizing the synergistic action of the denitrification action of the BSK bacteria and the denitrification action of the anaerobic microorganism by forming a portion. In particular, in the above-mentioned immobilized carrier, the BSK bacteria and the anaerobic microorganisms can be satisfactorily propagated even in wastewater having a low BOD and COD concentration due to the shape having a large surface area and the negative charge of polyvinylidene chloride. The efficiency of the above processing is high.

As described above, the treated water in which the pesticides and the nitrogen content have been treated through the first, second and third treatment tanks 5, 6 and 7 has a very low generation of blue-green algae and algae, and is thus transparent. The degree of improvement is improved, so that the appearance is not impaired even when returned to the regulating pond 1, and since it does not adversely affect the turf 20, it can be used as water for watering a golf course, and constitutes a closed system for wastewater treatment. Can be. In the embodiment, the treated water treated as described above is then discharged to the biological monitoring tank 16. The organism monitoring tank 16 also maintains the breeding conditions of the creatures 18 such as fish by blowing air from the air diffuser 17 at the bottom of the tank, and breeding the creatures 18 such as the fish such as carp and crucian carp. Water quality can be monitored based on the presence or absence of abnormalities. Therefore, it is safe even when discharged into rivers.

[0037]

As described above, according to the present invention, the first treatment step performed in an aerated state in the first treatment tank filled with the aerobic immobilization carrier, and the carbonaceous filler preliminarily immobilized with BSK bacteria are filled. A second processing step performed in an aerated state in the second processing tank,
B is known as a sewage treatment bacterium by sequentially treating wastewater through a third treatment step performed in an aerated state in a third treatment tank filled with aerobic and anaerobic coexisting immobilized carriers.
The pesticide and nitrogen content in the wastewater can be treated by a biological method by effectively exhibiting the pesticide treatment ability and the denitrification ability of the SK bacteria. Therefore, large-scale adsorption equipment in the physical treatment as a conventional pesticide treatment method, and large-scale equipment such as an anaerobic tank and an aerobic tank required in the conventional denitrification treatment method are not required, and thus a large investment is required. And the required wastewater treatment can be performed at low cost.

In the present invention, the treatment of the pesticide in the second treatment tank can be carried out not only by the BSK bacteria but also by the physical adsorption action of the carbonaceous filler itself as an immobilizing carrier. Therefore, even though the BSK bacteria are not sufficiently adjusted, as in the break-in operation period immediately after the start of the treatment, and thus the decomposition treatment is weak, the treatment of the pesticide can be performed by the physical adsorption of the carbonaceous filler itself. It can be done reliably.

[Brief description of the drawings]

FIG. 1 is a systematic explanatory diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Regulating pond 2 Pump tank 3 Pump 4 Waste water supply pipe 5 First processing tank 6 Second processing tank 7 Third processing tank 8 Blower 9 Air supply pipe 10 Aeration unit 11 Partition wall 12 Overflow hole 13 Aerobic fixation Carrier 14 Aerobic and anaerobic coexisting immobilization carrier 15 Carbonaceous filler 16 Biological monitoring tank 17 Aeration unit 18 Organism such as fish 19 Overflow hole 20 Turf

────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI C02F 3/10 C02F 3/10 Z 3/34 3/34 Z 101 101D (56) References JP-A-7-354600 (JP, A) JP-A-5-4092 (JP, A) JP-A-4-68102 (JP, A) JP-A-1-1444971 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name ) C02F 3/30-3/34 C02F 3/06

Claims (12)

(57) [Claims] 1. A first treatment step performed in an aerated state in a first treatment tank filled with an aerobic immobilization carrier, and a second treatment tank filled with a carbonaceous filler preliminarily immobilized with BSK bacteria. Agrochemicals for treating wastewater through a second treatment step performed in an aerated state, and a third treatment step performed in an aerated state in a third treatment tank filled with aerobic and anaerobic coexisting immobilization carriers, and Treatment of wastewater containing nitrogen 2. A first treatment step performed in an aerated state in a first treatment tank filled with an aerobic immobilization carrier, and a second treatment tank filled with a carbonaceous filler in which BSK bacteria have been immobilized in advance. In the second treatment process performed in the aeration state, and aerobic, the wastewater is sequentially processed through the third treatment process performed in the aeration state in the third treatment tank filled with the anaerobic coexisting immobilization carrier, the Treatment method for wastewater containing pesticides and nitrogen that discharges and monitors treated water into a biological monitoring tank that keeps fish and other organisms 3. The processing method according to claim 1, wherein
Aerobic immobilization carrier is a method for treating pesticides and nitrogen-containing wastewater with calcium-containing filler 4. The processing method according to claim 1, wherein
An aerobic and anaerobic coexisting immobilization carrier is a method for treating agricultural chemicals and nitrogen-containing wastewater as a filler made by accumulating radial annular filaments of polyvinylidene chloride in the longitudinal direction. 5. The processing method according to claim 1, wherein
A method for treating pesticides and nitrogen-containing wastewater whose charcoal filler is charcoal or molded charcoal 6. The processing method according to claim 1, wherein
The method of treating wastewater containing pesticides and nitrogen containing activated carbon as the carbonaceous filler 7. A first treatment tank filled with an aerobic immobilization carrier in a tank provided with aeration means, and a second treatment tank filled with a carbonaceous filler in which BSK bacteria have been previously fixed in a tank provided with aeration means. A second treatment tank, and a third treatment tank filled with aerobic and anaerobic coexisting immobilized carriers in a tank provided with aeration means, and treated water for supplying wastewater to the first treatment tank. Supply means, treated water supply means for supplying treated water from the first treatment tank to the second treatment tank, treated water from the second treatment tank to the third treatment tank, and treatment of the third treatment tank A pesticide and nitrogen-containing wastewater treatment device comprising a treated water discharge means for discharging water in place 8. A first treatment tank in which a tank provided with aeration means is filled with an aerobic immobilization carrier, and a second treatment tank in which a tank provided with aeration means is filled with a carbonaceous filler in which BSK bacteria have been previously fixed. A second treatment tank, a third treatment tank filled with aerobic and anaerobic coexisting immobilized carriers in a tank provided with aeration means, and a biological monitoring tank for breeding organisms such as fish, Treated water supply means for supplying to the first treatment tank, treated water for supplying the treated water of the first treatment tank to the second treatment tank, and treated water for supplying the treated water of the second treatment tank to the third treatment tank A pesticide and nitrogen-containing wastewater treatment apparatus comprising supply means and treated water discharge means for discharging treated water from a third treatment tank to a biological monitoring tank 9. The processing apparatus according to claim 7, wherein
The aerobic immobilization carrier is a treatment device for wastewater containing pesticides and nitrogen containing calcium-filled filler. 10. The pesticide according to claim 7, wherein the aerobic and anaerobic coexisting immobilization carrier is a filler formed by accumulating radially annular filaments of polyvinylidene chloride in the longitudinal direction. For treating wastewater containing nitrogen and nitrogen 11. The treatment apparatus according to claim 7, wherein the carbonaceous filler is charcoal or molded charcoal, and a pesticide and nitrogen-containing wastewater. 12. The treatment apparatus according to claim 7, wherein the carbonaceous filler is activated carbon, a pesticide and nitrogen-containing wastewater.