JPH03146193A - Waste water processing device - Google Patents

Abstract

PURPOSE:To dispense with a special process to extract an oily portion and decompose the oily portion positively with the dissipation of an obnoxious odor so that no sludge generates by ejecting air containing ozone to waste water in a state where microbes are kept in the waste water. CONSTITUTION:After charging a specified amount of microbes 60 in a processing tank 10, ozonizers 34 to 36 are started and a pump 42 is driven. As a result, air containing ozone is ejected from nozzles 21 to 23 after passing through ducts 31 to 33. The air containing ozone ejected from the nozzles 21 to 23 causes the oxidation reduction potential of the treated water to increase. If a sensor 27 detects that the potential has reached a range where microbes act actively, the voltage of the ozonizers 34 to 36 is adjusted by an adjuster 39 so that a controller 50 does not sterilize microbes. In this way, the ozone generation amount is controlled. The oily portion of waste water is decomposed and obnoxious odor is removed by the various actions of microbes dispersed in water, the oxidation process of ozone and decomposition of the oily portion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial 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, this type of treatment equipment for commercial use 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. 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. is decomposed by anaerobic bacteria generated on the surface of the filter medium, and then this wastewater is mixed and agitated in a contact aeration tank with air ejected from an aeration pipe, and brought into sufficient contact with the biological film on the surface of the contact material to oxidize it, and the wastewater is oxidized. nutrient substrates are removed.

[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, and moreover, oil can be removed alone or by adsorption to a mat. There was a problem in that the oil extracted from this process could not be disposed of in its original form and had to 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 has an extremely strong odor, and there is 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 generate 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, the wastewater treatment device of the present invention has the following features:
A treatment tank having an inlet for wastewater and an outlet for treated water, an ozone generating element, a high frequency high voltage power source 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. an ozonizer consisting of a regulator;
ozone ejection means for ejecting ozone generated by the ozonizer into the waste water in the treatment tank together with air; and microorganisms containing pre-cultured aerobic bacteria and/or mold into the waste water in the treatment tank. microbial maintenance means for maintaining the microorganisms.

[Effect] When microorganisms such as aerobic bacteria and mold are maintained in the wastewater by the microorganism maintenance means, and air containing ozone is ejected into the wastewater by the ozone ejection means, the microorganisms are activated by the ozone, and the ozone is Various decomposition actions including deodorizing action, fat decomposition action, and oil decomposition action of microorganisms make it possible to reliably decompose organic substances in waste water while dissipating the bad odor of waste water.

[Example] Next, embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 shows a first embodiment of the invention. Reference numeral 10 denotes 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. Processing 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 (1.0 m'' in volume), and the two partition walls 13 and 14 form three processing chambers 16 with approximately the same volume.
．． It is divided into 17 and 18. 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, and an outflow pipe 20 is connected to the outflow port 12. The outflow port 12 is provided at a lower position than the inflow port 11 so that untreated wastewater does not easily flow out.

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 metal and may be provided outside the processing chamber 16 adjacent to the inlet 11.

A microorganism maintainer 26 and an oxidation-reduction potential sensor 27 for detecting the oxidation-reduction potential of the treated water are disposed in the processing chamber 17.

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. 28a is a lid of the guide tube 28.

Nozzles 21-23 are connected via lines 31.32 and 33 to ozonizers 34.35 and 36, respectively. The ozonizers 34 to 36 each include an ozone generating element 37 having an electrode formed on a dielectric material, a high frequency high voltage power source 38 for applying a high frequency AC voltage to these elements 37, and adjusting the voltage or frequency of this power source 38. It is composed of a regulator 39 that adjusts the amount of ozone generated. Each regulator 39 can adjust the amount of ozone generated within the ozone concentration range of 0.5 ppm to 170 ppm.

A pump 42 is connected to the ozonizers 34 to 36 via a conduit 41.
is connected. Pump 42, pipe line 41, pipe lines 31 to 33
The nozzles 21 to 23 constitute ozone ejection means. The power supply 38 and pump 42 of the ozonizers 34-36 are connected to an AC power supply 43 via switches 34a, 35a, 36a and 42a, respectively.

The microorganism maintainer 26 maintains microorganisms such as aerobic bacteria and mold introduced into the processing tank 10, and includes a cylindrical body 44 formed of a conductive wire mesh and a large number of microorganisms filled in the cylindrical body 44. It includes a porous ceramic dielectric 45, an electrode 46 electrically connected to a wire mesh, and an ionizer 47 that applies a negative potential to the electrode 46 to negatively ionize the ceramic dielectric 45. 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 has a grain, pellet, or block shape 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 connected to these ceramic dielectrics 4.
5 is set so that it does not pop 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 are bacteria and actinomycetes that perform starch decomposition, sugar decomposition, fatty acid decomposition, protein decomposition, lignin decomposition, nitrification, sulfation, and fibrinolytic actions. It is a composite bacteria that can act within the temperature range of 4 to 80°C, which is selected from the groups of rhizobia, yeast, nitrifying bacteria, and filamentous bacteria in a predetermined ratio. 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 detected by the controller 50.
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 remove the pre-cultured microorganisms 6.
After a predetermined amount of ozonizer 0 has been added to the treatment tank 10 as shown by the arrow in FIG.
4 to 36, and then turn on the switch 42a to drive the pump 42.

Air containing about 1 to 2% by volume of ozone is supplied to pipes 31 to 33.
It passes through and is ejected from nozzles 21-23. At the same time, the controller 50 operates the ionizer 47 for a certain period of time using the timer 48 to apply a negative potential to the electrode 46, and
The ceramic dielectric material 45 contained in step 4 is negatively ionized. 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 is deactivated, the microorganisms leave the ceramic dielectric 45 and disperse into the water in the process chambers 16-18. Although not shown, a flow rate sensor is provided in the inflow pipe 19,
Preferably, the ionizer 47 is deactivated when the inflow 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. When the sensor 27 detects that the ozone-containing air ejected from the nozzles 21 to 23 increases the oxidation-reduction potential of the treated water and reaches the range of 300 to 400 mV at which microorganisms actively act, the controller 50 Adjust the voltage of ozonizers 34 to 36 to prevent sterilization.
9 to reduce 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. Redox potential to 300
In this example, water 1
The controller 50 controls the ozonizers 34 to 36, respectively, to generate 100 mg of ozone per hour at 0.00 (Hl).

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.

3CH3(CH2)4CH3+ 190*→21120
+18CO.

A moderate amount of ozone is emitted to raise the redox potential to 300-400.
Microorganisms such as aerobic bacteria and mold grow by controlling the voltage within the 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 is transferred to 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 waste water 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 cylinder 28 and flows out through the outflow pipe 20.

Table 1 shows the untreated wastewater and outflow collected from the inflow pipe 19 when kitchen wastewater with an hourly average inflow of 2.5 m" and a maximum hourly inflow of 5.0 m" was treated with the device of this embodiment. This is water quality data of the treated wastewater collected through the pipe 20. Water quality was measured by the JIS-0102 method.

Table 1 From Table 1, it was found that the apparatus of this example was able to 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, and the partition walls 13 and 14 are erected at the bottom of the tank, and each has an opening at the top thereof at the same level as the inflow pipe 19 and the outflow pipe 20. Nozzles 21 to 23 in three processing chambers 16 to 18
A single ozonizer 34 is connected to the two via a common pipe line 31. Further, a disinfection chamber 15 is provided between the processing chamber 18 and the outflow pipe 20, and a disinfection thin tube 31a is extended from a pipe line 31 to this disinfection chamber 15, 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'', and the controller 50 controls the ozonizer 34 to generate 50 mg of ozone per hour with 1000 g of water.

In an apparatus having such a configuration, the lid 16 is
Open a to 18a and add pre-cultured aerobic bacteria,
After putting a predetermined amount of microorganisms 6 and O such as mold into the treatment tank 10 manually or by a supply device as shown by the arrows in FIG. 2, a switch (not shown) is turned on and the ozonizer 34 and pump 4
Drive 2.

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 50 controls the regulator 39 of the ozonizer 34, as in the previous embodiment.

Table 2 shows the water quality 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'' was treated with the device of this embodiment. Data.Water quality measurement was performed according to JIS-0102 method.

Table 2 From Table 2, it was found that the apparatus of this example can treat water to a good standard for water quality 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, since the organic matter contained in the wastewater is mainly decomposed into carbon dioxide and water, 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: Treatment tank, 11: Inlet, 12: Outlet, 13.14: Partition wall, 16.17, 18: Processing chamber, 19: Inflow pipe, 20: Outflow pipe, 21.22, 23: Nozzle (ozone jet means), 24 Niscreen, 26: Microorganism maintenance device (microorganism maintenance means), 27 Dioxidation reduction potential sensor, 28 Two guide tubes, 34. 35. 36 + Ozonizer, 37; Ozone generation element, 38: High frequency high voltage power supply, 39 : Regulator, 42: Pump (ozone ejection means), 44: Cylindrical body, 45: Ceramic dielectric, 46: Electrode, 47: Ionizer, 60: Microorganism.

Claims (1)

[Claims] 1) A treatment tank having an inlet for wastewater and an outlet for treated water, an ozone generating element, a high frequency high voltage power supply that applies a high frequency AC high voltage to this element, and adjusting the power supply voltage or frequency. an ozonizer comprising a regulator that adjusts the amount of ozone generated by the ozonizer, an ozone ejection means that ejects the ozone generated by the ozonizer into the waste water in the treatment tank together with air, and a pre-cultured aerobic bacteria or mold and a microorganism maintaining means for maintaining microorganisms containing one or both of them in the waste water in the treatment tank. 2) The wastewater treatment apparatus according to claim 1, further comprising a microorganism supply means for supplying microorganisms to the treatment tank. 3) The wastewater treatment device according to claim 1, further comprising a screen for capturing coarse dust near the inlet of the wastewater. 4) The wastewater treatment apparatus according to claim 1, wherein a sensor for detecting the oxidation-reduction potential of the treated water is provided in the treatment tank, and the ozonizer regulator is adjusted by a detection signal from the sensor. 5) The wastewater treatment apparatus according to claim 1, wherein a plurality of treatment chambers are formed in the treatment tank by partitioning the treatment tank with one or more partition walls, and an ozone jetting means is provided in each treatment chamber. 6) The wastewater treatment apparatus according to claim 5, wherein the partition wall is provided at a predetermined height apart from the bottom of the tank. 7) The microorganism maintaining means includes a cylindrical body formed of a conductive wire mesh, a large number of porous ceramic dielectrics housed in the cylindrical body, and an electrode electrically connected to the wire mesh.
The wastewater treatment apparatus according to claim 1, further comprising an ionizer that applies a negative potential to the electrode to negatively ionize the ceramic dielectric. 8) Microorganisms include bacteria, actinomycetes, rhizobia, and yeast bacteria that perform starch decomposition, sugar decomposition, fatty acid decomposition, proteolysis, lignin decomposition, nitrification, sulfation, and fibrinolytic actions, respectively. 2. The wastewater treatment device according to claim 1, which is a composite bacterium which 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. 9) The wastewater treatment apparatus according to claim 1, wherein the outlet of the treated water is provided at a lower position than the inlet of the wastewater, and a guide tube for guiding water from the bottom of the treatment tank is connected to the outlet.