JP3209342B2 - 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]

In order to solve the above-mentioned problems, the present invention provides a first processing tank 5 in which aerobic immobilization carrier 10 is filled in a tank provided with aeration means, and an aeration means. In the provided tank, the second processing tank 6 filled with the aerobic and anaerobic coexisting immobilization carriers 11 is configured, and BSK bacteria are supplied to these processing tanks to be fixed. BSK bacteria are supplied to the treatment tank 5 where they are subjected to aerobic conditions.
Mainly pesticides and decomposition treatment, after which the treated water is supplied to the second treatment tank 6, where aerobic immobilization carrier by
BSK bacteria immobilized on the part under aerobic conditions
Anaerobic bacteria immobilized on the anaerobic part and under anaerobic conditions
The present invention provides a method for treating a pesticide and a nitrogen-containing wastewater, which performs a denitrification treatment by using the method. Further, the present invention also provides a first treatment tank 5 in which an aerobic immobilization carrier 10 is filled in a tank provided with aeration means,
A second treatment tank 6 in which aerobic and anaerobic coexisting immobilization carriers 11 are filled in a tank provided with aeration means, and a BSK bacteria culture tank 1
4, a supply means for supplying BSK bacteria from the culture tank 14 to each treatment tank, and a treated water supply means for supplying treated water to the first treatment tank 5; Pesticide and nitrogen-containing wastewater comprising treated water supply means for supplying treated water from the treatment tank 5 to the second treatment tank 6 and treated water discharge means for discharging treated water from the second treatment tank 6 to an appropriate place. Aerobic immobilized carrier 10 in a treatment apparatus and a tank provided with aeration means.
And a second treatment tank 6 filled with an aerobic and anaerobic coexisting immobilization carrier 11 in a tank provided with aeration means, and a culture tank 14 for BSK bacteria. , A regulating tank 1 provided with a pump tank 2 and a biological monitoring tank 18, a supply means for supplying BSK bacteria from the culture tank 14 to each treatment tank, and a water to be treated in the regulating tank 1 by a pump. Treated water supply means for supplying treated water from the re-pump tank 2 to the first treatment tank 5, treated water supply means for supplying treated water from the first treatment tank 5 to the second treatment tank 6, and second treatment tank The present invention provides an apparatus for treating wastewater containing pesticides and nitrogen, which constitutes treated water discharge means for discharging treated water of No. 6 to the biological monitoring tank 18.

In the above processing apparatus, the first and second processing tanks 5 and 6 are provided with a filling part a filled with the immobilized carrier and an unfilled part b not filled with the immobilized carrier. Filling section a
And the treated water of the first treatment tank 5 is supplied to each of them, and the treated water is derived from each of the non-filled portions b. In the above processing apparatus, the first and second processing tanks 6 are arranged such that the unfilled portion b of the first processing tank 5 is adjacent to the filled portion a of the second processing tank 6 via the partition wall 12. And the partition wall 12 is provided with an overflow hole 13
The overflow hole 13 can be configured as the treated water supply means. In the above-described processing method or apparatus, the aerobic immobilization carrier 10 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. In addition, a part of the aerobic immobilization carrier 10 can be made of a carbon-containing filler such as activated carbon fiber, activated carbon, and charcoal. In the above-mentioned treatment method or apparatus, the aerobic and anaerobic coexisting immobilization carrier 11 can use a filler obtained by accumulating radial annular filaments of polyvinylidene chloride in the longitudinal direction. Further, in the above-mentioned processing method or apparatus, the aeration means can be configured by providing an air diffuser 9 connected to an air supply pipe 8 connected to the blower 7 at a lower portion in the tank.

[0007]

The BSK bacterium supplied to the first treatment tank 5 is immobilized on the aerobic immobilization carrier 10 and is supplied with sufficient oxygen by aeration means. Of the pesticide in the wastewater is efficiently decomposed. Then, the treated water in which the pesticides in the wastewater are mainly decomposed as described above is supplied to the second treatment tank 6. The BSK bacteria supplied to the second treatment tank 6 are immobilized on the aerobic portion of the aerobic and anaerobic coexisting immobilization carrier 11, and sufficient oxygen is supplied by the aeration means, so that the first treatment tank In the same manner as in Example 5, the anaerobic condition is maintained, and anaerobic bacteria grow on the anaerobic portion of the immobilized carrier.
By the action of both of the SK bacteria, the nitrogen content in the wastewater can be efficiently removed. In the second treatment tank 6, the treatment is performed on the treated water in which the pesticide has been treated in the first treatment tank 5, so that the above-described denitrification treatment is efficiently performed.

If a calcium-containing filler such as oyster hulls is used as the aerobic immobilization carrier 10, the SS in the wastewater
The treatment of (suspended substances) is also performed well, and the visibility of treated water can be improved. If a part of the aerobic immobilization carrier 10 is composed of a carbon-containing filler, BSK bacteria can be propagated more favorably. If the aerobic and anaerobic coexisting immobilization carrier 11 is made of a filler obtained by accumulating radially annular filaments of polyvinylidene chloride in the length direction, the shape having a large surface area and the negativeness of polyvinylidene chloride Due to the action of the electric charge, the BSK bacteria and other microorganisms can be immobilized and propagated well even in wastewater having a low BOD or COD concentration. The supply of the water to be treated to the first treatment tank 5 is as follows:
In a golf course or the like, an appropriate amount of water can be supplied through the regulating pond 1, and the treated water treated in the second treatment tank 6 is discharged to the biological monitoring tank 18 so that it can be bred there. The water quality can be monitored by the fish 19 and the like.

[0009]

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,
The used pesticides and nitrogen fertilizer flow into the regulating pond 1 together with the 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 water from the pond as water to be treated, and a pump 3 provided in the pump tank 2 supplies a treated water supply pipe to a first treatment tank 5 described below. 4 are provided. Reference numerals 5 and 6 denote first and second processing tanks, respectively, and the first and second processing tanks 5 and 6 are provided with aeration means. The aeration means is configured by installing an air diffuser 9 connected to an air supply pipe 8 connected to a blower 7 at a lower portion in the tank. The first and second treatment tanks 5 and 6 are provided with a filling part a for filling the immobilized carrier for microorganisms and an unfilled part b not filled. Is filled with the aerobic immobilization carrier 10 and the filling portion a of the second processing tank 6 is filled with the aerobic and anaerobic coexisting immobilization carrier 11. The aerobic immobilization carrier 10 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. Further, a part of the aerobic immobilization carrier 10, activated carbon fiber, activated carbon,
It can be composed of a carbon-containing filler such as charcoal. The aerobic and anaerobic coexisting immobilization carrier 11 can use a filler formed by accumulating radial annular filaments of polyvinylidene chloride in the length direction. Incidentally, this filler is disclosed in
It is the same as that disclosed in Japanese Patent No. 38835 as a microorganism propagation promoter. In addition, the aerobic and anaerobic coexisting immobilization carrier 11 can have an appropriate configuration as long as it has a configuration in which a sufficient oxygen supply and an insufficient oxygen supply by the operation of the aeration unit are formed. However, the present invention is not necessarily limited to the above configuration. Needless to say, the aerobic immobilization carrier 10 can also be made of an appropriate material and shape. In the illustrated example, the first and second processing tanks 6 are integrally formed so as to be adjacent to each other with a partition wall 12 therebetween. It is adjacent to the filling part a of the processing tank 6. An overflow hole 13 is provided in the partition wall 12, and the treated water in the first treatment tank 5 is supplied to the second treatment tank 6 via the overflow hole 13. Means.
In addition, the first processing tank 5 and the second processing tank 6 may not be integrally provided as described above, and may be configured to be independently installed. The treated water supply means for supplying treated water to the second treatment tank 6 includes a supply pipe,
It can be configured appropriately. Further, the specific configuration such as the arrangement of the immobilized carrier in the first and second processing tanks 6 is also appropriate. Reference numeral 14 denotes a BSK bacteria culture tank, and BSK is supplied from the BSK bacteria culture tank 14 to the first and second treatment tanks 5 and 6.
It constitutes a supply means for supplying the SK bacteria. The BSK bacteria are stored as a dried product attached to perlite or the like, and it is effective to use them after adding and culturing a culture solution at around 37 ° C. at the time of use. Culture is performed. Therefore, the supply means of the BSK bacteria is constituted by a piping system 17 having a pump 15 and valves 16 respectively corresponding to the first and second processing tanks 5 and 6 as a liquid supply means. Reference numeral 18 denotes a biological monitoring tank. The biological monitoring tank 18 is provided with aeration means having the same configuration as the first and second processing tanks 5 and 6 so that fish 19 and the like can be bred. Then, the processing water in the second processing tank 6 is discharged to the biological monitoring tank 18. As described above, the treated water discharging means for discharging the treated water from the second treatment tank 6 is similar to the supply of the treated water from the first treatment tank 5 to the second treatment tank 6. In addition to the configuration in which a water overflow hole 20 is provided and water is discharged through the water overflow through the water overflow hole 20, a pump may be provided. The biological monitoring tank 18 may be configured independently as in the illustrated example, or may be configured integrally 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 of the first treatment tank 5 through the water supply pipe 4 by the operation of the pump 3. a. The BSK bacteria cultured in the BSK culture tank 14 are also supplied to the filling section a of the first processing tank 5 by the supply means. On the other hand, air is ejected from the lower diffuser 9 in the first processing tank 5 to generate an upward flow, and oxygen is supplied into the water while the inside of the tank is stirred by the water flow. Therefore, the inside of the first processing tank 5 including the filling part a is maintained aerobic,
Bacteria are propagated by being immobilized on the aerobic immobilization carrier 10. As such an aerobic immobilization carrier 10, oyster hulls are preferred from the viewpoint of economic efficiency and the ability to improve the transparency of treated water. Thus, the aerobic immobilization carrier 10 in the first treatment tank 5
Agrochemical components such as diazinon, TPN, flutolanil, and vesrozine can be decomposed mainly by BSK bacteria that have been immobilized and propagated. Thus, in the present invention, B
Rather than directly supplying the SK bacteria into the water to be treated in the treatment tank to perform the treatment, the SK bacteria are immobilized on the aerobic immobilization carrier 10 and the treatment is performed. It can be carried out. Further, in the first treatment tank 5, a part of the nitrogen content in the water to be treated is treated by the denitrifying action of the BSK bacteria. Thus, the treated water mainly subjected to the pesticide decomposition treatment as described above is supplied to the filling portion a of the second treatment tank 6 through the overflow hole 13. In the second processing tank 6, as in the first processing tank 5, BSK bacteria are supplied to the filling part a, and the inside of the tank is agitated by a water flow generated by air ejected from the lower aeration part 9. While the oxygen is supplied to the water. Therefore, the portion of the second treatment tank 6 that comes into contact with such a water flow is maintained aerobic, and BSK bacteria are immobilized on the corresponding portion of the aerobic and anaerobic coexisting immobilization carrier 11, that is, on the surface portion of the filler. Being bred. On the other hand, since the water flow does not easily come into contact with the inside of the filling portion a material, that is, the inside of the radial annular filament, this portion is maintained anaerobic, so that the BSK bacteria do not propagate and the anaerobic bacteria are fixed. Breed. Thus, a part of the residual pesticide components and nitrogen content in the treated water supplied to the filling part a of the second treatment tank 6 are treated by the aerobicly maintained BSK bacteria, and the nitrogen content is anaerobic. Denitrification treatment is performed by bacteria. As described above, in the second treatment tank 6, the treatment is performed on the treated water in which the pesticide is mainly treated in the first treatment tank 5, and the aerobic portion and the anaerobic By using the synergistic action of the denitrification action of BSK bacteria and the denitrification action of anaerobic bacteria in such a manner that a portion is formed, the denitrification treatment is efficiently performed. In particular, in the above-mentioned immobilized carrier, BOD and microorganisms of the anaerobic bacteria are well 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. And the efficiency of the above processing is high. The BSK bacteria which are the main components of the treatment in the first and second treatment tanks 5 and 6 are as follows:
Since the processing capacity decreases with time, it is most effective to supply from the BSK bacteria culturing tank 14 by the supply means as needed every time.

As described above, the treated water in which the agricultural chemical and the nitrogen content have been treated through the first and second treatment tanks 6 has a very low generation of water blooms and algae, thereby improving the transparency, and therefore, has been adjusted. Even if returned to the pond 1, the aesthetic appearance is not impaired, and the turf is not adversely affected, so that it can be used as water for watering a golf course, and a closed system for wastewater treatment can be configured. In the embodiment, the treated water treated as described above is then discharged to the biological monitoring tank 18. Air is blown out from the air diffuser 9 at the bottom of the biological monitoring tank 18 to maintain the breeding conditions of the fish 19 and the like.
Water quality can be monitored based on the presence or absence of abnormalities. Therefore, it is safe even when discharged into rivers.

[0012]

As described above, according to the present invention, the pesticide treatment capacity and the denitrification capacity of BSK bacteria known as sewage treatment bacteria are compared with the first and second immobilization carriers having different configurations. By effectively expressing it in the second treatment tank, pesticides and nitrogen in wastewater can be treated by biological methods, adsorption equipment in physical treatment such as adsorption treatment with activated carbon, The large-scale facilities such as the anaerobic tank and the aerobic tank required in the conventional denitrification treatment method are not required, and therefore, there is an effect that the required wastewater treatment can be performed at low cost without requiring a large investment.

[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 To-be-processed water supply pipe 5 First processing tank 6 Second processing tank 7 Blower 8 Air supply pipe 9 Aeration part 10 Aerobic immobilization carrier 11 Aerobic and anaerobic coexistence immobilization Carrier 12 partition wall 13 overflow hole 14 BSK bacteria culture tank 15 pump 16 valve 17 piping system 18 biological monitoring tank 19 fish 20 overflow hole 21 turf

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) C02F 3/30 C02F 3/06 C02F 3/10 C02F 3/34

Claims (17)

(57) [Claims] 1. A first treatment tank filled with an aerobic immobilized carrier in a tank provided with aeration means, and a second treatment tank filled with aerobic and anaerobic co-immobilized carriers in a tank provided with aeration means. In addition to configuring the treatment tanks, BSK bacteria are supplied to these treatment tanks and fixed, and wastewater is first supplied to the first treatment tank.
Therefore, the pesticides are mainly decomposed by BSK bacteria under aerobic conditions , and then the treated water is supplied to the second treatment tank where it is immobilized on the aerobic portion of the immobilization carrier.
BSK bacteria under aerobic conditions, immobilized on anaerobic part
Pesticide and nitrogen-containing wastewater, comprising denitrification with anaerobic bacteria under anaerobic conditions 2. A method for treating agrochemicals and nitrogen-containing wastewater, wherein the aerobic immobilization carrier according to claim 1 is a ceramic filler. 3. A method for treating agricultural chemicals and wastewater containing nitrogen, wherein the aerobic immobilization carrier according to claim 1 is a filler containing calcium. 4. A method for treating pesticides and nitrogen-containing wastewater, wherein the calcium-containing filler according to claim 3 is oyster shell. 5. A part of the aerobic immobilization carrier according to claim 1,
A method for treating pesticides and nitrogen-containing wastewater, comprising activated carbon fibers, activated carbon, and charcoal-containing fillers such as charcoal. 6. The pesticide and nitrogen component according to claim 1, wherein the aerobic and anaerobic coexisting immobilization carrier is a filler obtained by accumulating radial annular filaments of polyvinylidene chloride in the length direction. Wastewater treatment method 7. A method for treating agrochemicals and nitrogen-containing wastewater, wherein the aeration means according to claim 1 is provided with an aeration unit connected to an air supply pipe connected to a blower at a lower portion in the tank. 8. A first treatment tank filled with an aerobic immobilized carrier in a tank provided with aeration means, and a second treatment tank filled with aerobic and anaerobic co-immobilized carriers in a tank provided with aeration means. And a supply tank for supplying the BSK bacteria from the culture tank to the respective treatment tanks.
Treated water supply means for supplying treated water to the first treatment tank, treated water supply means for supplying treated water from the first treatment tank to the second treatment tank, and treated water for the second treatment tank A device for treating wastewater containing pesticides and nitrogen, characterized by comprising treated water discharge means for discharging wastewater in place. 9. A first treatment tank filled with an aerobic immobilization carrier in a tank provided with aeration means, and a second treatment tank filled with aerobic and anaerobic coexisting immobilization carriers in a tank provided with aeration means. A treatment tank, a culture tank for BSK bacteria, a regulating tank provided with a pump tank and a biological monitoring tank, supply means for supplying BSK bacteria from the culture tank to each treatment tank, Treated water supply means for supplying treated water from a pond to the first treatment tank from a re-pump tank by a pump, treated water supply means for supplying treated water from the first treatment tank to the second treatment tank, An apparatus for treating wastewater containing pesticides and nitrogen, comprising treated water discharging means for discharging treated water from a second treatment tank to a biological monitoring tank. 10. The first and second processing tanks according to claim 8 or 9 are provided with a filling section filled with an immobilized carrier and an unfilled section not filled with the immobilizing carrier. A device for treating agricultural chemicals and nitrogen-containing wastewater, characterized in that it is configured to supply treated water or treated water in a first treatment tank and to supply or discharge treated water from respective unfilled portions. 11. The first and second processing tanks according to claim 8 or 9, wherein the unfilled portion of the first processing tank is adjacent to the filled portion of the second processing tank via a partition wall. Composed of one,
An apparatus for treating agrochemical and nitrogen-containing wastewater, characterized in that an overflow hole is provided in the partition wall, and the overflow hole is configured as the treated water supply means according to claim 8 or 9. 12. An apparatus for treating agrochemicals and wastewater containing nitrogen, wherein the aerobic immobilization carrier according to claim 8 or 9 is a ceramic filler. 13. An apparatus for treating agrochemicals and nitrogen-containing wastewater, wherein the aerobic immobilization carrier according to claim 8 or 9 is a calcium-containing filler. 14. An apparatus for treating wastewater containing pesticides and nitrogen, wherein the calcium-containing filler of claim 13 is oyster hull. 15. The treatment of agricultural chemicals and wastewater containing nitrogen, wherein a part of the aerobic immobilization carrier according to claim 8 or 9 is constituted by a carbon-containing filler such as activated carbon fiber, activated carbon, charcoal and the like. Method 16. The agrochemical and anaerobic coexisting immobilizing carrier according to claim 8 or 9, wherein the carrier is a filler formed by accumulating radial annular filaments of polyvinylidene chloride in the longitudinal direction. Equipment for treating wastewater containing nitrogen 17. An apparatus for treating agrochemical and nitrogen-containing wastewater, wherein the aeration means according to claim 8 or 9 is provided with an air diffuser connected to an air supply pipe connected to a blower at a lower portion in the tank.