JPH04354599A - Treatment of waste water containing agricultural chemical and nitrogen and equipment - Google Patents

Abstract

PURPOSE:To decompose and remove agricultural chemicals and nitrogen by biologically and physically treating waste water contg. agricultural chemicals and nitrogen such as waste water of golf links. CONSTITUTION:In a first treatment stage for performing treatment of waste water in an aeration state in a first treatment tank 5 packed with an aerobic immobilization carrier 13, BOD, COD and SS are mainly removed by aerobic microorganisms and transparency is enhanced. Then in a second treatment stage for performing treatment of waste water in the aeration state in a second treatment tank 6 packed with a carbonaceous filler 15 previously immobilized with BSK fungi, agricultural chemical components are mainly decomposed by BSK fungi and removed by physical adsorption on the carbonaceous filler 15. Then in a third treatment stage for performing treatment of waste water in the aeration state in a third treatment tank 7 packed with an aerobic and anarobic copresent immobilization carrier 14, denitrification treatment is performed by BSK fungi and the anaerobic microorganisms.

Description

[Detailed description of the invention]

0001

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

0002

[Prior Art] For example, wastewater from golf courses contains nitrogen from pesticides and nitrogen fertilizers, but since the pesticides in this wastewater have high biotoxicity, biological methods, which are economical treatment methods, are used. No further processing has been carried out. In other words, in the past, wastewater containing agricultural chemicals has generally been treated by adsorption treatment using activated carbon, charcoal, etc., rather than by using biological methods.In addition to such physical treatment, There is no treatment of nitrogen in wastewater. In addition, as a conventional general method for treating nitrogen content in wastewater, a hydrogen donor such as methanol is added to wastewater.
There is a treatment method that performs biological treatment in an anaerobic tank or an aerobic tank.

0003

[Problems to be Solved by the Invention] In the treatment of agricultural chemicals using physical treatment, the adsorption life of the adsorbent such as activated carbon or charcoal is limited, and adsorption equipment requires a large amount of space and construction costs. And it's not economical. At golf courses, a lot of nitrogen fertilizer is used on the greens, etc., and it flows into the regulating pond along with rainwater.If the nitrogen content in this wastewater is not treated, blue-green algae and algae will grow in the regulating pond, which is aesthetically undesirable. Even if such nitrogen treatment is carried out using a conventional general denitrification treatment method, the conventional method
This method is not economical because it requires a large investment in the construction costs of a treatment tank that satisfies anaerobic conditions, a treatment tank that satisfies aerobic conditions, and hydrogen donor addition equipment.

[0004] The present invention focuses on the pesticide decomposition ability and denitrification ability of BSK bacteria, which has recently been known as a sewage treatment bacterium, and effectively develops these abilities to remove pesticides and nitrogen from the wastewater. The purpose of this is to solve the above-mentioned problems by performing the same processing. (Please note that B.S.
For K bacteria, see, for example, JP-A-1-144971. )

[0005]

[Means for Solving the Problems] To explain the means for solving the above-mentioned problems, firstly, the present invention provides a first treatment method which is carried out in an aerated state in a first treatment tank 5 filled with an aerobic immobilization carrier 13. a second treatment process carried out in an aerated state in a second treatment tank 6 filled with a carbonaceous filler 15 on which BSK bacteria have been immobilized in advance; and a second treatment process carried out in an aerated state, and filled with an aerobic and anaerobic coexisting immobilization carrier 14. The present invention provides a method for treating wastewater containing agricultural chemicals and nitrogen, in which wastewater is sequentially processed through a third treatment step in which the present invention is carried out in an aerated state in a third treatment tank 7.

Further, in the above treatment method, the present invention provides wastewater containing agricultural chemicals and nitrogen that is monitored by discharging the treated water treated in the third treatment tank 7 into a biological monitoring tank 16 in which living organisms such as fish are raised. provides a processing method.

The present invention comprises a first treatment tank 5 in which an aerobic immobilized carrier 13 is filled in a tank provided with an aeration means, and a carbonaceous filling in which BSK bacteria is preliminarily immobilized in the tank provided with an 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 equipped with an aeration means, and the wastewater is a water supply means for supplying treated water to the treatment tank 5; supplying treated water from the first treatment tank 5 to the second treatment tank 6; and supplying treated water from the second treatment tank 6 to the third treatment tank 7; The present invention provides an apparatus for treating wastewater containing agricultural chemicals and nitrogen, which includes a treated water supply means for discharging the treated water from the second treatment tank 6 and a treated water discharging means for discharging the treated water from the second treatment tank 6 to an appropriate location.

The present invention also provides a wastewater treatment device containing agricultural chemicals and nitrogen, which is configured to discharge the treated water from the third treatment tank 7 into the biological monitoring tank 16 in which living organisms are raised. provide.

[0009] In the above-mentioned treatment method or treatment apparatus, the aerobic immobilization carrier 13 filled in the first treatment tank 5 is preferably a calcium-containing filler.

[0010] Furthermore, in the above-mentioned processing method or processing apparatus, the aerobic and anaerobic coexistence immobilization carrier 14 filled in the third processing tank 7 is arranged so that the radial annular filaments of polyvinylidene chloride are formed in the longitudinal direction. Preferably, the filling material is an integrated filling material.

Furthermore, in the above-mentioned treatment method or treatment apparatus, the carbonaceous filler 15 filled in the second treatment tank 6 is
Charcoal or shaped charcoal or activated carbon is preferred.

0012

[Operation] The wastewater supplied into the first treatment tank 5 is treated by aerobic microorganisms that grow on the aerobic immobilization carrier 13 in an aerated state, and is mainly treated with BOD, COD and SS.
is removed, and visibility is improved. Incidentally, in this first processing section, a part of processing of agricultural chemicals is also performed.

Next, when the treated water treated in the first treatment tank 5 is supplied into the second treatment tank 6, BSK propagates well in the carbonaceous filler 15 in the second treatment tank 6 in an aerated state.
Bacteria mainly decompose agricultural chemicals in treated water efficiently with the same action as in a bioreactor. In other words, BSK bacteria has the ability to process BOD and COD in addition to pesticides, but since these BOD and COD are processed in advance in the first processing section, the decomposition process of pesticides is reduced accordingly. done efficiently. In this way, the treatment in the first treatment tank 5 becomes an effective pretreatment for the treatment in the second treatment tank 6.

On the other hand, since the carbonaceous filler 15 that immobilizes the BSK bacteria has a physical adsorption effect itself, the agricultural chemicals in the treated water are removed by the physical adsorption effect, and the above-mentioned BSK bacteria can remove agricultural chemicals from the treated water. Combined with the decomposition processing action, the processing action of pesticides is powerful. In addition, even during the acclimatization period immediately after the start of treatment, when the BSK bacteria are not sufficiently acclimatized and their decomposition treatment effect is weak, the above-mentioned physical adsorption effect of the carbonaceous filler 15 itself allows pesticide treatment to continue. It will definitely be done.

The treated water treated with pesticides in the second treatment tank 6 in this manner is then supplied to the third treatment tank 7, and the BSK bacteria are also supplied therewith. Since the inside of this 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 coexistence immobilization carrier 14 and propagate. On the other hand, anaerobic microorganisms breed in the anaerobic portion of this immobilization carrier. Therefore, the treated water supplied from the second treatment tank 6 is denitrified by the action of both the anaerobic microorganisms and the BSK bacteria, and nitrogen content is efficiently removed. Such denitrification treatment is carried out on the treated water treated with agricultural chemicals in the second treatment tank 6, so that it is carried out efficiently.

In the above treatment, if a calcium-containing filler such as oyster shell is used as the aerobic immobilization carrier 13 filled in the first treatment tank 5, SS in the wastewater can be treated even better. , the transparency of treated water can be further improved.

Furthermore, if a filler made of polyvinylidene chloride radial annular filaments accumulated in the length direction is used as the aerobic and anaerobic coexistence immobilization carrier 14 to be filled in the third treatment tank 7, the surface area can be increased. Due to the large shape and 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.

Furthermore, 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 that has been treated for a predetermined period of time can be taken out and used effectively as fuel.

Furthermore, as mentioned above, the treated water treated in the third treatment tank 7 is discharged into the biological monitoring tank 16, so that the water quality can be monitored by the living organisms 18 such as fish kept there. be able to.

[0020]

Embodiments Next, embodiments of the present invention will be described in detail with reference to the drawings. The figure shows a system diagram of an embodiment in which the present invention is applied to wastewater treatment at a golf course, and reference numeral 1 indicates a regulating pond. Generally, a golf course is provided with several regulating ponds 1, and used agricultural chemicals and nitrogen fertilizers flow into the regulating ponds 1 along with rainwater. Therefore, pesticides may remain in the regulating pond 1,
Nitrogen fertilizer gradually accumulates at the bottom. This nitrogen fertilizer causes the growth of blue-green algae and algae, which is aesthetically undesirable. Therefore, this regulating pond 1 is provided with a pump tank 2 for supplying pond water as wastewater, and a wastewater supply pipe 4 is provided from a pump 3 installed in this pump tank 2 to a first treatment tank 5 described below. There is.

Reference numerals 5, 6, and 7 indicate first, second, and third processing tanks, respectively.
7 is provided with an aeration means. These aeration means are constructed by installing an aeration section 10 connected to an air supply pipe 9 connected to a blower 8 in the lower part of each tank.

[0022] Also, the first, second and third processing tanks 5, 6, 7
is provided with a filling part a where microorganism immobilized carriers are filled and a non-filling part b where no microorganisms are filled. Furthermore, the first, second, and third processing tanks 5, 6, and 7 are integrally constructed so as to be adjacent to each other with a partition wall 11 in between, and the non-filled portion b of the first processing tank 5 is located in the second processing tank. The unfilled portion b of the second processing tank 6 is adjacent to the filled portion a of the third processing tank 7 . Each partition wall 11 is provided with overflow holes 12, and the treated water from the first treatment tank 5 flows through these overflow holes 12 to the second treatment tank 6, and then to the second treatment tank 6. The treated water is supplied to the third treatment tank 7, and these constitute treated water supply means.

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

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

The aerobic immobilization carrier 13 may be a ceramic filler or a calcium-containing filler including such a ceramic filler. Moreover, oyster shell can be used as the calcium-containing filler.

The aerobic and anaerobic immobilization carrier 14 may be a filler made of polyvinylidene chloride radial annular threads accumulated in the longitudinal direction. This filler is the same as that disclosed as a microbial growth promoter in Japanese Patent Application Laid-Open No. 2-238835. In addition, the aerobic and anaerobic coexistence immobilization carrier 14 can have any suitable structure as long as it has a structure in which a sufficient supply of oxygen is formed by the operation of the aeration means and a part is insufficiently supplied. However, the configuration is not necessarily limited to the above configuration. Of course,
The aerobic immobilization carrier 13 can also be made of any suitable material and shape.

Further, as the carbonaceous filler 15, ordinary charcoal, molded charcoal, activated carbon, etc. can be used. Molded charcoal is produced by pulverizing uncarbonized material (young charcoal), which is an underground resource, adding a caking agent to the main ingredient, molding it, and then firing it.It is as good as charcoal. It has high adsorption capacity and good immobilization of microorganisms. The above-mentioned carbonaceous filler 15 may be composed of these charcoal, molded charcoal, activated carbon, etc. alone, may be composed of a combination of these, or may be composed of a filler that partially includes these. You can also do it.

Reference numeral 16 designates a biological monitoring tank, and this biological monitoring tank 16 has a diffuser connected to the air pipe 9 as an aeration means, similar to the first, second, and third treatment tanks 5, 6, and 7. Organisms 1 that can be monitored such as fish by providing an air part 17
8 is reared, and the treated water from the third treatment tank 7 is discharged into this biological monitoring tank 16. The treated water discharge means for discharging the treated water of the third treatment tank 7 in this way is configured to discharge the treated water 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. Similarly to the supply of treated water to the third treatment tank 7, an overflow hole 19 is provided in the third treatment tank 7, and the water is discharged through the overflow hole 19, and a pump and a discharge pipe are also provided. be able to. Therefore, this biological monitoring tank 16 can be constructed independently as shown in the illustrated example, or alternatively, it can be constructed integrally with the second treatment tank 6.

In the above configuration, the water in the regulating pond 1 containing agricultural chemicals and nitrogen fertilizer is transferred from the pump tank 2 to the filling part a of the first treatment tank 5 through the wastewater supply pipe 4 by the operation of the pump 3. Supplied. Air is ejected from the aeration section at the lower part of the first treatment tank 5, creating an upward flow, and oxygen is supplied into the water while the tank is agitated by the water flow. Therefore, the inside of the first processing tank 5 including the filling part a is maintained aerobically, and common aerobic microorganisms are propagated and immobilized on the aerobic immobilization carrier 13. As such aerobic immobilization carrier 13, oyster shell is suitable from the viewpoint of economy and ability to improve the transparency of treated water.

In the wastewater supplied to the first treatment tank 5, the organic matter that is a source of BOD and COD is decomposed by the aerobic microorganisms that have grown on the aerobic immobilization carrier 13, and SS is also decomposed by the catalytic oxidation effect. It is removed and visibility is improved. As mentioned above, in this first treatment tank 5, a part of pesticide treatment is also performed.

The treated water thus treated in the first treatment tank 5 is supplied to the filling part a of the second treatment tank 6 through the overflow hole 12. In this second treatment tank 6,
BSK bacteria fixed in advance on the carbonaceous filler 15 are propagated under aerobic conditions through aeration, and these BSK bacteria mainly decompose agricultural chemicals such as diazinon, TPN, flutolanil, and beslozin. Such decomposition treatment is B
The SK bacteria are not directly supplied to the wastewater in the treatment tank for treatment, but are immobilized on the carbonaceous filler 15 and treated, so that the agricultural chemicals can be mainly decomposed efficiently with the same action as a bioreactor. Can be done. In other words, BSK bacteria has the ability to process BOD and COD in addition to pesticides, but since these BOD and COD are processed in advance in the first processing section, the decomposition process of pesticides is reduced accordingly. done efficiently. Of course, in the second treatment tank 6, in addition to decomposing the agricultural chemicals, a portion of the nitrogen content in the wastewater is also treated by the denitrifying action of the BSK bacteria.

On the other hand, the carbonaceous filler 15 such as charcoal or activated carbon that immobilizes the BSK bacteria has a physical adsorption effect itself, so the physical adsorption effect also helps in removing agricultural chemicals from the treated water. Coupled with the decomposition treatment effect of the BSK bacteria, the treatment effect of agricultural chemicals is strong. In addition, even during the acclimatization period immediately after the start of treatment, when the BSK bacteria are not sufficiently acclimatized and their decomposition treatment effect is weak, the above-mentioned physical adsorption effect of the carbonaceous filler 15 itself allows pesticide treatment to continue. It will definitely be done.

[0033] If the processing capacity of the BSK bacteria and the carbonaceous filler 15 itself decreases after the predetermined treatment period has elapsed, a new carbonaceous filler with BSK bacteria immobilized is prepared at another location. 15 may be partially replaced or completely replaced. As the above-mentioned method for immobilizing BSK bacteria, any conventional appropriate method can be applied. Further, the carbonaceous filler 15 taken out from the filling part may be discarded, but if 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 part a of the third treatment tank 7 through the overflow hole 12, and together with this, the treated water in the second treatment tank 6 is supplied to the filling part a of the third treatment tank 7. The BSK bacteria grown in In this third treatment tank 7,
As with the first and second treatment tanks 6, oxygen is supplied into the water while the inside of the tank is agitated by the water flow generated by the air ejected from the lower air diffuser 10, and the parts that come into contact with such water flow. is maintained aerobically, and B is added to the corresponding part of the aerobic and anaerobic coexistence immobilization carrier 14, that is, the surface part of the above-mentioned filler.
SK bacteria becomes immobilized and proliferates. On the other hand, since it is difficult for the water flow to come into contact with the inside of the filling member, that is, the inside of the radial annular thread, this area is maintained in an anaerobic state, and therefore, BSK bacteria do not breed, but general anaerobic microorganisms do. , fixed.

Therefore, some of the pesticide components and nitrogen remaining in the treated water supplied to the filling part a of the third treatment tank 7 are B
In addition to being processed by SK bacteria, nitrogen is also denitrified by anaerobic microorganisms. In this way, in the third treatment tank 7, treatment is performed mainly on the treated water treated with pesticides in the second treatment tank 6, and the immobilization carrier has an aerobic part and an anaerobic part. Denitrification treatment is efficiently performed by utilizing the synergistic effect of the denitrification effect of BSK bacteria and the denitrification effect of anaerobic microorganisms. In particular, in the above-mentioned immobilization carrier,
Due to the shape with a large surface area and the negative charge possessed by polyvinylidene chloride, the above BSK bacteria and anaerobic microorganisms can propagate well even in wastewater with low BOD and COD concentrations.
The efficiency of the above processing is high.

The treated water that has been treated with pesticides and nitrogen through the first, second, and third treatment tanks 5, 6, and 7 as described above has very little blue-green algae and can be seen clearly. Therefore, even if the water is returned to the regulating pond 1, the aesthetic appearance will not be impaired, and since it will not have a negative impact on the grass 20, it can also be used as water for watering golf courses, thus forming a closed system for wastewater treatment. Can be done. In an embodiment, the treated water treated as described above is then discharged to biological monitoring tank 16. In this biological monitoring tank 16, air is blown out from an aeration part 17 at the bottom of the tank to maintain conditions for raising fish and other living things. Water quality can be monitored based on the presence or absence of abnormalities. Therefore, it is safe even when discharged into rivers, etc.

[0037]

Effects of the Invention As described above, the present invention includes a first treatment process carried out in an aerated state in a first treatment tank filled with an aerobic immobilization carrier, and a carbonaceous filler in which BSK bacteria has been immobilized in advance. a second treatment process carried out in an aerated state in a second treatment tank,
By sequentially treating wastewater through a third treatment process carried out in an aerated state in a third treatment tank filled with aerobic and anaerobic immobilization carriers, B.
The pesticide processing ability and denitrification ability of the SK bacteria can be effectively expressed, and the pesticides and nitrogen content in wastewater can be treated by a biological method. Therefore, there is no need for large-scale adsorption equipment required for physical treatment as conventional pesticide treatment methods, or large-scale equipment such as anaerobic tanks and aerobic tanks required for conventional denitrification treatment methods, which requires a large amount of investment. This eliminates the need for wastewater treatment and allows the necessary wastewater treatment to be performed at low cost.

[0038] Furthermore, in the present invention, the agricultural chemicals can be treated in the second treatment tank by utilizing not only the BSK bacteria but also the physical adsorption effect of the carbonaceous filler itself as an immobilization carrier. Therefore, even during the acclimatization period immediately after the start of treatment, when the BSK bacteria are not sufficiently acclimatized and their decomposition effect is weak, the above-mentioned physical adsorption effect of the carbonaceous filler itself allows pesticide treatment to continue. It can be done reliably.

[Brief explanation of the drawing]

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

[Explanation of symbols]

1 Regulation pond 2 Pump tank 3 Pump 4 Waste water supply pipe 5 First treatment tank 6 Second treatment tank 7 Third treatment tank 8 Blower 9 Air supply pipe 10 Air diffuser 11 Partition wall 12 Overflow hole 13 Aerobic immobilization Carrier 14 Aerobic and anaerobic coexistence immobilization carrier 15
Carbonaceous filler 16 Biological monitoring tank 17 Aeration section 18 Living organisms such as fish 19 Overflow hole 20 Grass

Claims (1)

[Scope of Claims] [Claim 1] A first treatment process carried out in an aerated state in a first treatment tank filled with an aerobic immobilization carrier;
A second treatment process is carried out in an aerated state in a second treatment tank filled with a carbonaceous filler with immobilized bacteria, and a third treatment process is carried out in an aerated state in a third treatment tank filled with an aerobic and anaerobic immobilization carrier. [Claim 2] A method for treating wastewater containing agricultural chemicals and nitrogen by sequentially passing through a third treatment step carried out in The processing process and BSK in advance
A second treatment process is carried out in an aerated state in a second treatment tank filled with a carbonaceous filler with immobilized bacteria, and a third treatment process is carried out in an aerated state in a third treatment tank filled with an aerobic and anaerobic immobilization carrier. A method for treating wastewater containing agricultural chemicals and nitrogen, in which the wastewater is sequentially treated through a third treatment step, and the treated water is discharged into a biological monitoring tank in which living organisms such as fish are raised for monitoring.[Claim 3] [Claim 4] In the treatment method of claim 1 or 2, the aerobic immobilized carrier is a calcium-containing filler used as a pesticide and nitrogen-containing wastewater treatment method. A method for treating pesticides and nitrogen-containing wastewater, wherein the aerobic and anaerobic coexisting immobilization carrier is a filler made of radial annular threads of polyvinylidene chloride accumulated in the length direction. [Claim 6] In the treatment method of claim 1 or 2, the carbonaceous filler is made of charcoal or molded charcoal. [Claim 7] A first treatment tank in which an aerobic immobilization carrier is filled in a tank equipped with an aeration means, and a tank equipped with an aeration means. a second treatment tank filled with a carbonaceous filler on which BSK bacteria has been immobilized in advance, and a third treatment tank filled with an aerobic and anaerobic coexistence immobilization carrier in a tank equipped with an aeration means. In addition, a water supply means for supplying wastewater to the first treatment tank, the treated water from the first treatment tank to the second treatment tank, and the treated water from the second treatment tank to the third treatment tank. A treatment device for wastewater containing agricultural chemicals and nitrogen, comprising a treated water supply means and a treated water discharge means for discharging treated water from a third treatment tank to an appropriate location. A first treatment tank filled with an aerobic immobilization carrier, a second treatment tank filled with a carbonaceous filler on which BSK bacteria has been immobilized in advance in a tank equipped with an aeration means, and a tank equipped with an aeration means. A third treatment tank filled with aerobic and anaerobic coexisting immobilization carriers and a biological monitoring tank in which living organisms such as fish are raised, and a water supply means for supplying wastewater to the first treatment tank. and a treated water supply means for supplying the treated water of the first treatment tank to the second treatment tank and the treated water of the second treatment tank to the third treatment tank, and the treated water of the third treatment tank. A treatment device for agricultural chemical and nitrogen-containing wastewater, comprising a means for discharging treated water into a biological monitoring tank.Claim 9: In the treatment device according to claim 7 or 8, the aerobic immobilization carrier is a calcium-containing filler. [Claim 10] In the treatment device according to claim 7 or 8, the aerobic and anaerobic coexistence immobilization carrier comprises polyvinylidene chloride radial annular filaments having a length. A treatment device for agricultural chemical and nitrogen-containing wastewater using a filler that is accumulated in the direction [Claim 11]
12. The treatment apparatus according to claim 7 or 8, wherein the carbonaceous filler is charcoal or molded charcoal. , the carbonaceous filler is used as activated carbon in agricultural chemicals and nitrogen-containing wastewater treatment equipment.