JPH0585236B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an apparatus for treating oil-containing wastewater or domestic gray water. More specifically, it relates to equipment suitable for treating water containing edible oil discharged from commercial kitchens such as hotels, inns, cafeterias, restaurants, and food service centers, or equipment for treating gray water discharged from home kitchens and toilets. It is. [Prior Art] Conventionally, for commercial use, this type of treatment equipment is equipped with a floating oil separation tank or an oil absorption mat, and either the floating oil is forcibly taken out or the oil is adsorbed on the oil absorption mat. The mats are replaced regularly. In addition, household wastewater treatment equipment is equipped with an anaerobic filter bed tank and a contact aeration tank, and the anaerobic filter bed tank is filled with soil containing anaerobic bacteria, and the organic matter in the wastewater is removed by the anaerobic filter bed tank. After decomposition by anaerobic bacteria generated on the surface of the filter media, this wastewater is mixed and agitated in a contact aeration tank with air ejected from an aeration pipe.
In addition, the biofilm on the surface of the contact material is brought into sufficient contact with the biofilm to oxidize and remove the nutrient substrate in the wastewater. [Problems to be Solved by the Invention] Although the above-mentioned commercial treatment equipment can remove oil from the wastewater itself, the extraction work must be carried out in a foul-smelling environment, which is cumbersome.
Moreover, the oil extracted either alone or by being adsorbed onto pine cannot be disposed of as it is, and there is a problem that it must be incinerated or reprocessed. In addition, in household treatment equipment, the soil quality differs due to regional differences in soil containing anaerobic bacteria and the degree of contamination with pesticides, herbicides, etc., which causes variations in the decomposition power of bacteria, making it difficult for the treatment equipment to function effectively. There was a problem that it did not work. Furthermore, the methane gas generated in the anaerobic filter bed tank not only produces an extremely strong odor, but also has a limit to the amount of biological sludge that can be retained on the surface of the contact material in the contact aeration tank, so the contact material must be reversed periodically. There was a drawback that maintenance work such as washing was required. A first object of the present invention is to provide a wastewater treatment device that does not require special work to extract oil, dissipates bad odors, reliably decomposes oil, and does not produce sludge. A second object of the present invention is to provide a wastewater treatment device that can purify domestic gray water to a certain water quality standard without emitting bad odors. [Means for Solving the Problems] In order to achieve the above object, as shown in FIG.
and a treatment tank 10 having an outlet 12 for treated water, an ozone generating element 37, a high frequency high voltage power source 38 that applies a high frequency AC high voltage to this element, and adjusting the power supply voltage or frequency to adjust the amount of ozone generated. Ozonizers 34 to 36 consisting of a regulator 39 and ozone generated in the ozonizers 34 to 36 are transferred to the treatment tank 1.
ozone ejection means 21, 22, 23, 42 that ejects ozone into the waste water in the treatment tank 10 together with air; and microorganism maintenance means 26 for maintaining the microorganisms. The characteristic structure is that the microorganism maintaining means 26 is a cylindrical body 4 formed of a conductive wire mesh.
4, a large number of porous ceramic dielectrics 45 accommodated in this cylindrical body 44, an electrode 46 electrically connected to this wire mesh, and a negative potential applied to this electrode 46 to and an ionizer 47 that negatively ionizes the ionizer 45. [Operation] A negative potential is applied to the electrode 46 electrically connected to the wire mesh by the ionizer 47 of the microorganism maintaining means 26, and the ceramic dielectric 4 that has entered the cylindrical body 44 is heated.
When 5 is negatively ionized, positively charged microorganisms 60 such as aerobic bacteria and mold are maintained in the wastewater. In this state, the ozone jetting means 21 to 2
3 and 42, when air containing ozone is ejected into the wastewater, the ozone activates the microorganisms 60, and the ozone's deodorizing and oil-decomposing effects and the various decomposition effects including the oil-degrading action of the microorganisms 60 cause the wastewater to have a bad odor. It is possible to reliably decompose organic substances in wastewater while dissipating water. [Example] Next, an example of the present invention will be described in detail based on the drawings. FIG. 1 shows a first embodiment of the invention. 10 is a treatment tank of a wastewater treatment device, and in this example, the treatment device is a device for treating wastewater from the kitchen of a feeding center. The treatment tank 10 has an inlet 11 for wastewater and an outlet 12 for treated water. The processing tank 10 has a width of 70 cm, a length of 210 cm, and a depth of 100 cm (capacity of approximately 1.0 cm).
m ³ ) and is partitioned by two partition walls 13 and 14 into three processing chambers 16, 17 and 18 having approximately the same volume. 10a is a lid of the processing tank 10. The partition walls 13 and 14 are provided at a predetermined height apart from the bottom of the tank, and the treated water flows from the treatment chamber 16 to the treatment chamber 17.
The water flows into the processing chamber 18 through the bottom of the tank. An inflow pipe 19 is connected to the inflow port 11,
An outflow pipe 20 is connected to the outflow port 12 . The outlet 12 is designed to prevent untreated wastewater from easily flowing out.
It is provided at a lower position than the inlet 11. The processing chambers 16, 17, and 18 of the processing tank 10 are provided with nozzles 21, 22, and 23 that eject air containing ozone. A box-shaped screen 24 made of stainless steel wire mesh is removably provided in the processing chamber 16. The tip of the inflow pipe 19 is directed toward the screen 24 . This screen 24 may be made of aluminum or other metals and may be provided outside the processing chamber 16 adjacent to the inlet 11. The processing chamber 17 includes a microorganism maintainer 26 and an oxidation-reduction potential sensor 27 that detects the oxidation-reduction potential of the treated water.
will be placed. The processing chamber 18 is provided with a guide cylinder 28 that guides water at the bottom of the processing tank to the outlet 12. 28
a is the lid of the guide tube 28; Nozzles 21-23 are connected to ozonizers 34, 35 and 36 via conduits 31, 32 and 33, respectively. The ozonizers 34 to 36 each have an ozone generating element 37 formed with an electrode on a dielectric material.
, a high frequency high voltage power supply 38 for applying a high frequency AC voltage to these elements 37, and this power supply 38.
It is composed of a regulator 39 that adjusts the voltage or frequency of the ozone to adjust the amount of ozone generated. Each regulator 39
The amount of ozone generated can be adjusted within the ozone concentration range of 0.05ppm to 170ppm. A pump 42 is connected to the ozonizers 34 to 36 via a conduit 41. pump 42, pipe line 41,
The pipes 31 to 33 and the nozzles 21 to 23 constitute ozone ejection means. The power supply 38 and pump 42 of the ozonizers 34 to 36 are connected to switches 34a and 3, respectively.
It is connected to an AC power source 43 via 5a, 36a and 42a. The microorganism maintainer 26 maintains microorganisms such as aerobic bacteria and mold introduced into the treatment tank 10, and includes a cylindrical body 44 formed of a conductive wire mesh,
This cylindrical body 44 is filled with a large number of porous ceramic dielectrics 45, an electrode 46 is electrically connected to the wire mesh, and a negative potential is applied to the electrodes 46 to negatively ionize the ceramic dielectrics 45. An ionizer 47 is provided. The ionizer 47 has a circuit that biases the pulse voltage to a negative potential, and is provided outside the processing tank 10. The ceramic dielectric 45 is in the form of granules, pellets, or blocks with an outer diameter of 2 mm to 15 mm. The cylindrical body 44 has a bottom, and the mesh of the wire mesh is set so that these ceramic dielectrics 45 do not come out. Examples of the ceramic dielectric 45 include aluminum oxide, titanium oxide, barium titanate, silicon oxide, magnesium oxide, and composites thereof. The microorganisms 60 introduced into this treatment tank 10 include bacteria that perform starch decomposition, sugar decomposition, fatty acid decomposition, proteolysis, lignin decomposition, nitrification, sulfation, and fibrinolytic actions, respectively.
4 to 80℃ with a predetermined ratio of multiple types selected from the group of actinomycetes, rhizobia, yeast, nitrifying bacteria, and filamentous fungi.
It is a complex bacterium that can function within the temperature range of As the microorganisms 60, a plurality of types of microorganisms are appropriately selected from among the above-mentioned microorganisms according to the temperature, water quality, etc. of the wastewater. In the present invention, by using the above-mentioned composite bacteria, unlike conventional anaerobic bacteria, there is no variation in various decomposition effects caused by regional differences in the soil collected or the degree of contamination with pesticides, herbicides, etc., and the oil content in the processing equipment is always maintained. The various decomposition capacities mentioned above, including the decomposition capacity, are kept constant. Also, because it is aerobic, it has the advantage of not producing foul-smelling gases such as methane gas. The detection output of the oxidation-reduction potential sensor 27 is connected to the controller 50, and the control output of the controller 50 is connected to the regulator 39 of the ozonizers 34 to 36 and the ionizer 47. The controller 50 is provided with a timer 48 for operating the ionizer 47 for a certain period of time. The operation of the wastewater treatment device having such a configuration will be explained. Open the lid 10a of the treatment tank 10 and place the pre-cultured microorganisms 60 into the treatment tank 1 as shown by the arrow in FIG.
After putting a predetermined amount into 0, switch 34a to 36a
is turned on to start the ozonizers 34 to 36, and then the switch 42a is turned on to drive the pump 42. Air containing about 1 to 2% by volume of ozone is ejected from the nozzles 21 to 23 through the pipes 31 to 33. At the same time, the controller 50 uses the ionizer 47
is activated for a certain period of time by the timer 48, and the electrode 4
A negative potential is applied to 6 to negatively ionize the ceramic dielectric 45 that has entered the cylindrical body 44. As a result, microorganisms such as aerobic bacteria and fungi that are positively charged are attracted to the ceramic dielectric body 45 and maintained. When the ionizer 47 becomes inactive, the microorganisms leave the ceramic dielectric 45 and enter the processing chamber 1.
6 to 18 in water. Although not shown, it is preferable to provide a flow rate sensor in the inflow pipe 19 and to disable the ionizer 47 when the inflow rate increases. When wastewater flows into the treatment tank 10 from the inflow pipe 19, coarse dust is first captured by the screen 24. This screen 24 is periodically cleaned to remove dust. The ozone-containing air ejected from the nozzles 21 to 23 increases the oxidation-reduction potential of the treated water and activates microorganisms.
When the sensor 27 detects that the voltage has reached the 400 mV range, the controller 50 adjusts the voltage of the ozonizers 34 to 36 to the regulator 39 so as not to sterilize microorganisms.
This reduces the amount of ozone generated. When the oxidation-reduction potential of the treated water falls below 300 mV, the amount of ozone generated is increased again by the regulator 39. To maintain the redox potential in the range of 300-400mV,
In this example, the controller 50 controls the ozonizers 34 to 36 so that 100 mg of ozone is generated per hour using 1000 g of water. Due to the aforementioned various actions of the microorganisms dispersed in the water and the oxidizing action and oil decomposition action of ozone, the oil in the wastewater is decomposed and the bad odor disappears. For example, when n-hexane is contained in wastewater, ozone decomposes n-hexane into water and carbon dioxide according to the following equation. 3CH ₃ (CH ₂ ) ₄ CH ₃ +190 ₃ →21H ₂ O + 18CO ₂ Emit a moderate amount of ozone to raise the redox potential to 300~
Microorganisms such as aerobic bacteria and mold grow by controlling the voltage within the 400 mV range, and the microorganisms are maintained in the treatment tank 10 by the microorganism maintainer 26 controlled by the ionizer 47, so a large amount of wastewater flows into the treatment tank. 10 continuously for a long time, the ability to decompose oil does not decrease, and the wastewater can be stably purified. The wastewater is purified as it goes from the treatment chamber 16 to the treatment chambers 17 and 18, and the treated water, in which the oil content has been decomposed and the odor has disappeared, is guided from the bottom of the treatment tank 10 to the guide tube 28 and flows out through the outflow pipe 20. do. Table 1 shows the untreated wastewater collected from the inflow pipe 19 and the outflow pipe 20 when kitchen wastewater with an hourly average inflow of 2.5 m ³ and a maximum hourly inflow of 5.0 m ³ was treated with the device of this embodiment. This is the water quality data of the treated wastewater collected in . Water quality measurement was performed according to JIS-K-0102 method.

[Table] Table 1 shows that the apparatus of this example can treat wastewater to a good water quality standard. Note that the above-mentioned wastewater treatment device can be used not only for kitchen wastewater treatment but also for large-scale industrial plants. Further, instead of manually introducing the microorganisms 60 into the processing tank 10, the microorganisms may be included in a fluid substance and automatically supplied by the controller 50. FIG. 2 shows a second embodiment of the invention. In this example, the treatment device is a device that treats gray water from kitchens and toilets in homes. In FIG. 2, the same reference numerals as in FIG. 1 indicate the same components. In this example, the outflow pipe 20 is provided at the same level as the inflow pipe 19, the partition walls 13 and 14 are provided upright at the bottom of the tank, and the inflow pipe 19 and the outflow pipe 2 are provided at the top, respectively.
It has an aperture at the same level as 0. 3 processing chambers 1
A common pipe line 31 is provided for the nozzles 21 to 23 of 6 to 18.
A single ozonizer 34 is connected via. Additionally, a disinfection chamber 15 is located between the processing chamber 18 and the outflow pipe 20.
A disinfection chamber 15 is provided with a disinfection thin tube 31a extending from a conduit 31, and a nozzle 31b is provided at the tip of the thin tube 31a. 16a, 17a and 18a are lids of the processing tank 10. The volume of the treatment tank 10 is approximately 2.0 m ³ , and the controller 50 controls the ozonizer 34 to generate 50 mg of ozone per hour using 1000 m of water. In the apparatus having such a configuration, the lids 16a to 18a are opened in the same manner as in the previous embodiment, and microorganisms 60 such as aerobic bacteria and molds that have been cultured in advance are manually introduced into the processing tank 10 as shown by the arrows in FIG. After adding a predetermined amount using the operation or supply device, a switch (not shown) is turned on to drive the ozonizer 34 and the pump 42. Since air containing ozone is ejected from the nozzles 21 to 23, this ozone has an oil decomposition action and a deodorizing action. As the wastewater in the treatment tank 10 flows from the treatment chamber 16 to the treatment chamber 18, it is purified by the lignin decomposition, nitrification, sulfation, and fibrinolysis. Further disinfection is carried out in the disinfection room 15 using air containing ozone. Based on the redox potential detected by the oxidation-reduction potential sensor 27, the controller 5
0 controls the regulator 39 of the ozonizer 34. Table 2 shows the water quality data of the wastewater collected in the treatment chamber 16, treatment chamber 17, and outflow pipe 20 when household gray water with an average daily inflow of 1.25 m ³ was treated with the device of this embodiment. It is. Water quality measurement is JIS
-K-0102 method was used.

[Table] From Table 2, it was found that the device of this example can treat water to a good water quality standard as a domestic septic tank. The wastewater treatment equipment shown in Figure 2 is not limited to the treatment of gray water from household kitchens and toilets, and can be installed following the treatment equipment shown in Figure 1 to treat wastewater purified by the treatment equipment shown in Figure 1. may be further purified. [Effects of the Invention] As described above, according to the present invention, ozone activates various actions of microorganisms, and also activates ozone's deodorizing action and fat-decomposing action, and various decomposition actions including the oil-decomposing action of microorganisms. By using this function in combination with the above-mentioned action and by providing a means to maintain microorganisms that tend to flow out during treatment, it is possible to continuously dissipate bad odors from wastewater without having to specifically extract oil from wastewater discharged from commercial kitchens. It is possible to reliably decompose oil in wastewater. In particular, according to the present invention, organic matter contained in wastewater is mainly decomposed into carbon dioxide and water, so no sludge is generated, and maintenance and inspection of the treatment equipment can be carried out easily. In addition, it is possible to purify domestic gray water to a certain water quality standard without emitting bad odors.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a wastewater treatment apparatus according to a first embodiment of the present invention. FIG. 2 is a configuration diagram of a wastewater treatment device according to a second embodiment of the present invention. 10... Processing tank, 11... Inlet, 12... Outlet, 13, 14... Partition wall, 16, 17, 18...
...Processing chamber, 19...Inflow pipe, 20...Outflow pipe, 2
1, 22, 23... Nozzle (ozone ejection means),
24... Screen, 26... Microorganism maintenance device (microorganism maintenance means), 27... Redox potential sensor,
28... Guide tube, 34, 35, 36... Ozonizer, 37... Ozone generating element, 38... High frequency high voltage power supply, 39... Regulator, 42... Pump (ozone ejection means), 44... Cylinder shaped body, 45... ceramic dielectric, 46... electrode, 47... ionizer, 60... microorganism.

Claims (1)

[Scope of Claims] 1. A treatment tank 10 having an inlet 11 for wastewater and an outlet 12 for treated water, an ozone generating element 37, a high frequency high voltage power supply 38 that applies a high frequency AC high voltage to this element, and the power supply voltage. Or an ozonizer 34, 35, which is composed of a regulator 39 that adjusts the frequency and adjusts the amount of ozone generated.
36, ozone ejection means 21, 22, 23, 42 for ejecting ozone generated in the ozonizers 34 to 36 together with air into the waste water in the treatment tank 10, and either pre-cultured aerobic bacteria or mold. A wastewater treatment device comprising a microorganism maintaining means 26 that maintains microorganisms 60 containing one or both of them in the waste water in the treatment tank 10, the microorganism maintaining means 26 having a cylindrical shape formed of a conductive wire mesh. body 44, a large number of porous ceramic dielectric bodies 45 housed in this cylindrical body 44,
A wastewater treatment device characterized by comprising an electrode 46 electrically connected to the wire mesh, and an ionizer 47 that applies a negative potential to the electrode 46 to negatively ionize the ceramic dielectric 45. 2. The wastewater treatment apparatus according to claim 1, further comprising a microorganism supply means for supplying the microorganisms 60 to the treatment tank 10. 3. The wastewater treatment device according to claim 1, further comprising a screen 24 for capturing coarse dust near the inlet 11 of the wastewater. 4 A sensor 27 is provided in the treatment tank 10 to detect the oxidation-reduction potential of the treated water, and the ozonizers 34 to 3
2. The wastewater treatment apparatus according to claim 1, wherein the regulator 39 of No. 6 is adjusted by the detection signal of the sensor 27. 5 Processing tank 10 with one or more partition walls 13, 14
2. The wastewater treatment apparatus according to claim 1, wherein a plurality of treatment chambers 16, 17, and 18 are formed in the treatment tank 10 by partitioning the treatment chambers, and ozone jetting means 21 to 23 are provided in each treatment chamber. 6. The wastewater treatment apparatus according to claim 5, wherein the partition walls 13 and 14 are provided at a predetermined height apart from the bottom of the tank. 7 Microorganism 60 has starch decomposition action, sugar decomposition action,
Bacteria, actinomycetes, rhizobia, and yeast bacteria that perform fatty acid decomposition, proteolysis, lignin decomposition, nitrification, sulfation, and fibrinolysis, respectively.
2. The wastewater treatment device according to claim 1, which is a composite bacterium that is selected from the group of nitrifying bacteria and filamentous fungi in a predetermined ratio and is capable of acting within a temperature range of 4 to 80°C. 8. The wastewater treatment apparatus according to claim 1, wherein the treated water outlet 12 is provided at a lower position than the wastewater inlet 11, and a guide tube 28 for guiding water from the bottom of the treatment tank is connected to the outlet 12.