JP2000061492A - Treatment system for oily pollutant-containing organic wastewater and treatment of oily pollutant-containing organic wastewater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable introduction of wastewater treatment equipment of the system into any place provided that it has only a small required space, accordingly installation of the equipment even in a restaurant and also reduction in initial cost and running cost required for the system to comparatively low levels. SOLUTION: The treatment using this system comprises: a filtration stage for charging wastewater 3 contg. oily pollutants 5 into a storage vessel 50, subjecting the oily pollutants 5 to decomposition with fat/oil-digestive bacteria 7 in the storage vessel 50 and also there, performing wastewater filtration operation with a solely physical filtration medium 9, to continuously purify the wastewater 3 for a prescribed time and to discharge purified water; and a cleaning stage for stopping the charge of the waste water 3 contg. the oily pollutants 5 into the storage vessel 50, thereafter heating the waste water 3 and the filter medium 9, remaining in the storage vessel 50, by a heating means, agitating them with an agitation means and further supplying air to them by an air supply means, to mainly clean the oily pollutants 5 captured on the filter medium 9, with fat/oil-digestive bacteria 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil turbidity-containing organic wastewater treatment system and oil turbidity-containing organic wastewater applied to small-scale wastewater containing oil turbidity (solid oil + liquid oil) from a grease trap or the like. Regarding processing method.

[0002]

2. Description of the Related Art Grease traps are provided in kitchen drainages such as restaurants and restaurants, and in places where cooked foods are prepared at major supermarkets. This grease trap is a simple separator that separates the floating oil, and the wastewater discharged from it still contains a lot of oil turbidity (solid oil + liquid oil). However, since the drainage of the food and beverage industry is small, it has been out of the scope of legal regulation until now. However,
In recent years, wastewater from small-scale restaurants often contains oil turbidity, so the BOD value of the wastewater is high, and it is said to be one of the major causes of water pollution. Laws and regulations on wastewater have been considered.

[0003]

However, even if regulation of small-scale food and drink wastewater begins, the following difficult problems are expected. First, it is difficult to secure the installation space even if large-scale wastewater treatment facilities such as activated sludge used in general factories are installed in restaurants and restaurants.
In particular, it is almost impossible to secure a large space at existing stores. In addition, businesses such as restaurants and restaurants are generally small, and it is difficult to introduce expensive equipment. Furthermore, the wastewater purification process does not directly lead to an increase in sales and profits, but on the contrary, it has a negative effect and needs to add the cost to the product, which causes a problem that the running cost cannot be increased.

The present invention solves the above-mentioned problems, and it is possible to install wastewater treatment equipment as long as there is a small empty space, and it is possible to install it in restaurants and restaurants, and the initial cost and running cost are relatively low. An object of the present invention is to provide an oil turbidity-containing organic wastewater treatment system and an oil turbidity-containing organic wastewater treatment method suitable for small-scale wastewater treatment that can be provided at low cost.

[0005]

[Means for Solving the Problems] In order to achieve the above object,
The invention according to claim 1 has a reservoir provided with an inlet pipe for inflowing wastewater containing oil turbidity, and an outlet pipe for treating and discharging the oil, wherein the oil digestion is performed in the reservoir. Bacteria, physical filtration material, heating means for heating the physical filtration material and the waste water collected in the storage tank, an air supply means for supplying air to the physical filtration material and the waste water, And a control means for operating the heating means, the air supply means and the stirring means for a predetermined time after stopping for a predetermined time. It is in an organic wastewater treatment system containing oil suspension. In the invention described in claim 2, wastewater containing oil turbidity is injected into a storage tank, and in addition to the decomposition of the oil turbidity due to oil-and-fat-digesting bacteria, it is continuously purified by a physical filtration material filtration operation for a predetermined time. After stopping the filtration process for discharging and draining the wastewater containing the oil suspension into the storage tank, the wastewater and the filtration material accumulated in the storage tank are heated by the heating means and stirred by the stirring means. A method for treating organic wastewater containing oil turbidity, characterized by comprising: supplying air by an air supply means to them to purify oil turbidity mainly captured by the filtration material by oil-digesting bacteria. It is in.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The oil turbidity-containing organic wastewater treatment system and the oil turbidity-containing organic wastewater treatment method according to the present invention will be described in detail below.

(1) Embodiment 1 FIGS. 1 to 3 show one embodiment of an oil turbidity-containing organic wastewater treatment system and an oil turbidity-containing organic wastewater treatment method of the present invention.
Is an overall illustration of an organic wastewater treatment system containing oil turbidity, Fig. 2
3 is a block diagram of the control unit, and FIG. 3 is a time chart showing the operation of each unit of the control unit shown in FIG.

In FIGS. 1 and 2, an oil turbidity-containing organic wastewater treatment system has a storage tank 50 and a control means, and the storage tank 50 contains oil and fat digesting bacteria 7 and a physical filter material 9 (hereinafter, simply It is referred to as a "filter material"), a heating means, an air supply means, and a stirring means. The storage tank 50 is provided with an inlet pipe 18 for inflowing the wastewater 3 containing the oil turbidity 5 and an outlet pipe 85 capable of treating the wastewater 3 for outflow. In FIG. 1, the solid oil content of the floating oil is referred to as the oil suspension 5, but the oil suspension 5 includes liquid oil content in addition to the solid oil content.
The basic configuration of the organic wastewater treatment system containing oil turbidity is that the wastewater 3 is continuously treated by the decomposition operation by bacteria and the filtration operation of solid-liquid separation during the day according to the business hours of restaurants, etc. By utilizing the time when the waste water 3 stops, the solid oil and fat components that have not been completely processed by being trapped in the filter material 9 that has been filtered through continuous processing during the daytime are decomposed and removed over time. Specifically, a filter 9 is filled on the perforated plate 80 laid in the lower part of the storage tank to form a fixed-bed filtration device, and the drainage undiluted solution is allowed to pass through the storage tank 50 by downflow during the daytime. The digestive bacteria 7 decompose the oil suspension 5 (biological treatment), and the oil suspension 5 of solid particles suspended in the waste water 3 which cannot be sufficiently decomposed by continuous treatment is captured by the filter 9 and discharged. It is discharged from the pipe 85 as purified water 3a which is a filtrate. Then, during the drainage stop time such as at night, backwashing is carried out by the air supply means and the stirring means to release the oil suspended matter 5 adhering to the filter material 9, and at the same time, the heating means, the air supply means and the stirring means are used. The activity of the digestive bacteria 7 is activated to efficiently decompose and remove the oil suspended matter 5, and the stand-by is performed for a new daytime continuous wastewater treatment on the next day. The control means is responsible for the two-step switching between the drainage outflow time zone during this business time and the drainage stop time zone during non-business hours. The control means controls the inflow and outflow of the drainage water 3 into the storage tank 50 or the purified water 3a coming out of the storage tank 50, and controls the activity of the oil and fat digesting bacteria 7 in two stages, active and inactive.

The storage tank 50 is a vertical cylindrical device, and connects the drainage 3 flowing into the grease trap 10 and the like to the upper part of the tank with the inlet pipe 18 supplied through the inflow pump 30. The lower part of the tank is joined to the outlet pipe 85, the waste water 3 is filtered or decomposed with bacteria, and then the discharge pump 95 is supplied as purified water 3a.
The discharge pipe 10 of the existing grease trap 10
Release from b. When the present system is adopted, the existing grease trap 10 has a lid 10c on the bottom of the conduit before leading to the discharge pipe 10b.

Oil and fat digesting bacteria 7 are supplied into the storage tank 50. The oil-and-fat-digesting bacteria 7 are periodically put into the storage tank 50. The oil-and-fat digestive bacterium 7 is a useful microorganism having an excellent ability to decompose the oil suspended matter 5, and particularly exerts its effect on the decomposition of animal and vegetable oils and fats. Examples of the oil-and-fat digestive bacteria 7 include ISO900 manufactured by Cylon, Inc. in the United States.
There are bacterial species (appearance ... brown powder, odor ... yeast odor) of the 2 acquired factories, and this is also the case in this embodiment (specifically, BI-CHEM SM-700, a microbial agent for purification of waste water manufactured by Cylon Co. of the United States, or a grease cutting enzyme microorganism Formulation BI-CHEM TD-800
SPESIAL) is used. The oil-and-fat-digesting bacteria 7 are fixed to powder such as rice bran (or even bran). The fat-and-oil-digesting bacteria 7 prefer oxygen and have a predetermined temperature (40 ° C to 50 ° C).
It has the property of becoming active at (° C), and when it is relatively inactive, it inhabits by clinging to the filter material 9 that also becomes a residence. By the way, in general, the oil turbidity 5 in the wastewater is charged to the (+) side, while the oil-and-fat digestive bacteria such as TD-800 SPESIAL is charged to the (-) level. It adheres and decomposes.

The filter material 9 is a perforated plate 80 below the tank of the storage tank 50.
Filled on top to form a packed bed. The suspended particles in the waste water 3 are separated through the packed bed. Examples of the filter material 9 include sand, activated carbon, acid clay, unglazed glass fiber, metal,
There are wood, pulp, etc., but wood chips, plastics, calcium carbonate, inorganic stones, etc. are preferable. In view of the fact that the oil turbidity 5 is (+) charged as described above, these filter materials 9 are filled in the storage tank 50 and a static electricity generator or the like is provided to forcibly filter the entire filter material. This is because the negative (-) charge can be applied to enhance the filtration processing ability. Porous chips capable of holding the oil-and-fat digestive bacteria 7 and particularly wood chips are suitable for the filter material 9. Wood chips containing a large amount of sapwood are more preferable. Wood sapwood includes water conduits, temporary conduits, etc. Sapwood stores starch and other substances and serves as a nutrient source for bacteria. When the growing wood is felled and turned into wood chips, the lumen of the conduit, which was the water passage, becomes the habitat of bacteria. The size of a wood chip is 2 mm to 15 mm on one side (long side) (average value is about 5 m.
m), with a short side of 2 mm to 10 mm. The reason why the wood chips are small in this way is that the wood chips as the filter material 9 need to be cross-linked to capture the suspended particles of the oil suspension 5. Also, the outer surface per unit volume becomes large,
This is because the number of porous conduit entrances increases, the number of habitats for oil-digesting bacteria 7 increases, the number of bacteria saved when drainage flows out increases, and this has a positive effect on reproduction.
Since the wastewater 3 and the filter material 9 in the storage tank 50 are processed by the natural flow of the wastewater 3 injected into the storage tank 50 by downflow, the volume ratio of the filter material is about 90% and the drainage material is about 90%. 10
It will be about%.

The symbol K also functions as a filter material,
It is a lump that gradually dissolves in the solution and exhibits alkalinity. The lump K is appropriately supplied and filled in the storage tank 50 together with the filter material 9. As the block K, coral sand is used here. Coral sand, 50mm ³ ~5000mm ³ (more preferably 50mm ³ ~1000mm ³⁾ preferably lumps 5 size range of. If it is too small, it will be downsized due to melting and will immediately flow out through the eyes of the perforated plate 80, while if it is too large it will be inconvenient for handling,
Further, it is possible that the dispersion with the filter material 9 cannot be made uniform and the pH concentration may locally change. The lump K, which is a coral sand, has calcium carbonate as a main component, and gradually dissolves in the wastewater 3, and plays a role of adjusting the acidified biased wastewater 3 to a pH at which the fat-and-oil-digesting bacteria 7 can easily operate. Calcium carbonate is also preferable in that it can be negatively charged as described above.

In order to activate the activity of the oil and fat digesting bacteria 7, the storage tank 50 is first provided with an air supply means. From the fan 60 as the air supply means to the blower pipe 62,
Reservoir 5 through header 64 and a plurality of injection nozzles 66
Air is supplied into the zero. In this embodiment, the air from the fan 60 causes a bubbling mixed flow to be generated from the injection nozzle 66, and the stirring operation by bubbling is performed on the filter material 9 and the waste water 3 remaining in the tank. The injection nozzle 66 is arranged below the filling layer formed by the filter material 9 in order to enhance the stirring efficiency for the filter material 9. That is, it is provided in the storage tank 50 at an upper position near the perforated plate 80. The air supply means here not only supplies oxygen to the oil-and-oil-digesting bacteria 7 but also causes the injection nozzle 66 to play a role of stirring the wastewater 3 accumulated in the filter material 9 and the storage tank 50. It also constitutes a stirring means that activates the activity of. Secondly, a heating means is provided to bring the wastewater 3 introduced into the storage tank 50 to a predetermined temperature. In order to bring the filter material 9 in the storage tank 50 and the waste water 3 remaining in the tank to a predetermined temperature, a power source 70 is connected via a semiconductor switch 72 to a belt-shaped rubber heater 74 as a heating means. The rubber heater 74 is wound around and attached to the outer wall of the storage tank 50 to heat the filter 9 and the residual drainage 3 in the tank by heat conduction.

The drainage 3 is injected into the storage tank 50 by the operation of the inflow pump 30 to pump out the drainage 3 of the grease trap 10 through the inlet pipe 18, and the shower generating section 40 having a plurality of spray nozzles on the lower surface of the cylindrical plate. Then, the drainage 3 is sprayed and dropped from the upper part in the storage tank 50. The nozzle for spraying the wastewater 3 in the shower generation unit 40 is naturally located above the upper surface of the filling layer of the filter material 9 in the storage tank 50 as shown in FIG. The reason why the drainage water 3 is made into a shower shape is to increase the contact efficiency with the air in the storage tank 50 to assist the growth of the oil and fat digestive bacteria 7, and to balance the load by averaging the shower spraying. By the way, in the operation of the inflow pump 30, the GS liquid level detection unit 111 detects that the liquid level in the grease trap 10 has reached a predetermined height,
In addition, it is operated only for a predetermined time. Storage tank 50
The drainage 3 injected into the water passes through the packed bed of the filter material 9 by gravity flow and returns from the bottom of the treatment tank 50 to the discharge pipe 10b at the grease trap outlet. Purified water 3 at the bottom of the storage tank 50
The storage tank liquid level detection unit 117 detects that a has flowed down, and the grease pump 1 is operated by the operation of the discharge pump 95.
Purified water 3a is discharged from the discharge pipe 10b through 0.

The control unit 100 as the control means is shown in FIG.
As shown in FIG. 3, a timer unit 101 and a timer unit 1 that repeat a High signal and a Low signal at regular intervals.
01 two on / off time rotary switches 103 as an instruction unit, a liquid crystal display 105 as a display unit for displaying the on / off times, and a liquid level of the grease trap 10 are predetermined. GS liquid level detection unit 111 for detecting that the height has risen, storage tank 5
A storage tank liquid level detection unit 117 that detects that the purified water 3a that has passed through the packed layer of the filter material 9 at the lower part of 0 flows down,
A driving unit 120 for converting signal power of the timer unit 101 or the like into driving power is provided.

The GS liquid level detector 111 is provided on the inner bottom surface of the grease trap 10, and inputs the output of the pressure sensor 15 whose voltage value changes due to water pressure to one end of a comparator 107 having hysteresis, and compares the output. If the output potential of the pressure sensor 15 (water level of the grease trap 10) is higher than the reference voltage by setting the reference potential (reference water level) at the other end of the device 107 by the variable resistor 109, the comparator 10
High signal is output from 7. In addition, the storage tank liquid level detection unit 117 outputs the output of the pressure sensor 55 provided on the inner bottom surface of the storage tank 50 to the comparator 11 having a hysteresis.
If the output voltage of the pressure sensor 55 is higher than the reference voltage, the comparator 113 outputs a High signal.
Outputting a signal. It should be noted that the comparators 107 and 113 are provided with a hysteresis function because after detecting that the liquid surface has reached a predetermined height, the comparators until the liquid surface becomes a predetermined amount lower than the predetermined height. This is because the outputs of 107 and 113 are maintained at High signals to prevent the hunting operation of the inflow pump 30 and the discharge pump 95.

The drive unit 120 has a heater drive unit 122 and a fan drive unit 124 whose output is a High signal, and the output of the timer unit 101 is Lo.
w signal, and the output of the GS liquid level detection unit 111 is High.
It has an inflow pump drive unit 126 which operates at a signal (the liquid surface has a predetermined height). Therefore, the output signal of the timer unit 101 is passed through the NOT element 102 which inverts the output signal
It is connected to one end of the input of the ND element 104, and the output of the GS liquid level detector 111 is connected to the other end of the input.
The output of the ND element 104 is connected to the inflow pump drive unit 126.

The output signal of the timer section 101 is Lo
w signal and the output signal of the storage tank liquid level detector 117 is H
It has a discharge pump driving unit 128 which operates by an IG signal (the liquid surface has a predetermined height). For this purpose, the timer unit 10
The output signal of No. 1 is connected to one end of the input of the AND element 106 via the NOT element 102 which inverts the output signal, and the other end of the input is connected to the output of the storage tank liquid level detection unit 117. The output of 106 is the discharge pump drive unit 12.
8 is connected.

Next, a method for treating oil-containing matter-containing organic wastewater using the oil-containing matter-containing organic wastewater treatment system configured as described above will be described with reference to FIGS. 1 to 3. First, if the business hours of the store (drainage outflow time zone) are, for example, 9:00 to 21:00, the rotary switch 103 turns on time (from 23:00 to 6:00) in consideration of usage time such as washing the kitchen before and after the start. ) And the off time (6:00 to 23:00). The on time and the off time are displayed on the liquid crystal display 105.

Now, the drainage 3 flows into the grease trap 10 from the inflow pipe 10a between 6 o'clock and 23 o'clock,
When the liquid level of the grease trap 10 rises, the output voltage of the pressure sensor 15 becomes higher than the reference voltage of the comparator 107 at time t1, and the High signal from the output of the comparator 107 and the Low signal of the timer unit 101 are NOT. Element 102
The high signal inverted by the above is input to the AND element 104, and the AND element outputs the high signal to drive the inflow pump 30 by the inflow pump drive unit 126.

The inflow pump 30 is a grease trap 10.
The drainage 3 (including oil turbidity 5) accumulated in the
The water is injected into the storage tank 50 via the, and the waste water 3 is jetted and supplied in a shower shape by the shower generation unit 40. At this time, since the output of the timer unit 101 is the Low signal, the heater 74 and the fan 60 are off.

Eventually, the injected wastewater 3 naturally flows down the filter material 9 in the storage tank 50 and reaches the lower portion of the storage tank as purified water 3a. At time t2, the output voltage of the pressure sensor 55 becomes the reference of the comparator 113. It becomes higher than the voltage, and the High signal from the output of the comparator 113 and the Low of the timer unit 101
High signal obtained by inverting the signal by the NOT element 102,
Input to the AND element 106, the AND element outputs a High signal to drive the discharge pump 95 by the discharge pump driving unit 128. When the wastewater 3 flows through the storage tank 50, the wastewater 3 is mainly subjected to a physical filtration process in a packed bed of the filter material 9 (filtration step). In addition to the decomposition of the oil suspension 5 by the fat-and-oil-digesting bacteria 7, a filtration process of continuously purifying and flowing out for a predetermined period of time is carried out exclusively by a filtration operation of a physical filtration material. In addition,
Such continuous cases include variations in the amount of drainage during business hours and cases where the drainage is temporarily interrupted. After the filtration process is performed and the wastewater 3 becomes the purified water 3a, the wastewater 3 returns to the inside of the grease trap 10 through the pipe 85 and is discharged through the discharge pipe 10b. In this filtration step, the fat-and-oil-digesting bacteria 7 mainly contain liquid oil and other organic substances in the waste water and decompose proteins, sugars, starches, other synthetic fibers and the like. However, in the filtration process, continuous operation of the drainage 3 (actually, the drainage 3 does not constantly flow, but the amount of drainage fluctuates and is intermittent depending on the business situation), and the inside of the storage tank 50 is also performed. However, since the heater 74 and the fan 60 are turned off and oxygen is insufficient and the temperature is low, the decomposing power of the oil and fat digesting bacteria 7 is not large. Therefore, solid oil with a large load is continuously treated while being captured by a filtration operation. The suspended solids 5 such as the solid oil content and the SS content of other organic matter in the wastewater 3 are trapped in the packed bed of the filter material 9, and the wastewater after passing through the storage tank 50 in the continuous operation becomes clear purified water 3a. It is a mechanism.

Next, when the time reaches 23:00, the timer section 101 outputs a High signal and the heater driving section 122.
While turning on the semiconductor switch 72 to heat the heater 74 to warm the filter material 9 and the drainage water 3 in the storage tank 50,
At the same time, the fan drive unit 124 operates the fan 60 to send an air flow from the tip of the nozzle 64 through the blower pipe 62 and the discharge unit 64 to stir the filter material 9 and the residual drainage 3 in the tank. Then, the oil-and-fat-digesting bacteria 7 are activated to decompose the suspended solids 5 such as solid oil (purification step). That is, after stopping the pouring of the wastewater 3 containing the oil suspended matter 5 into the storage tank, the wastewater 3 and the filter material 9 accumulated in the storage tank are heated by the heating means, stirred by the stirring means, and further supplied by the air supply means. The purifying step is carried out in which the air due to the above is supplied to them to purify the oil suspension 5 mainly captured by the filter material 9 by the oil and fat digesting bacteria 7. In the purification step, the bubbling of air from the nozzle 66 releases the oil turbidity 5 trapped in the filter layer to reduce the filtration resistance, and the bubbling of air stirs the inside of the storage tank to digest oil and fat. Increase the degree of mixing of bacteria 7 and oil suspension 5. The biological aerobic treatment of the oil suspension 5 by the oil-and-fat digestive bacteria 7 is effectively performed. As described above, the wastewater treatment is performed by alternately switching the filtration step in the business hours and the purification step in the non-business hours. Here, even if the oil-and-fat-digesting bacteria 7 are in the activated state, it takes about 5 hours to decompose most of the oil turbidity 5 captured by the filtration operation during the day. From 7 to 6 am is set for 7 hours. In order to heat the filter material 9 and the waste water 3 to a predetermined temperature, there is a time delay determined by the temperature difference and the heat capacity, and therefore the heater 70 is operated earlier in time than the operation of the fan 60. You may keep it. This time may be adjusted by detecting the temperature of the filter 9 or the drainage 3 in the storage tank 50. Further, it goes without saying that the functions of the timer 101 and the like may be realized by a microcomputer.

The oil turbidity-containing organic wastewater treatment system and the oil turbidity-containing organic wastewater treatment method thus configured make good use of the daily outflow pattern of the wastewater discharged from restaurants and the like. During business hours, liquid oil etc. are decomposed by oil-and-fat digestive bacteria, but the oil turbidity-containing organic wastewater treatment facility is made into a small space because the oil turbidity in the effluent is captured and continuously treated by the filtration operation. It can be stored compactly. Since it does not employ a batch processing system that collects wastewater that is discharged one after another during business hours during the day, the installation area can be small. And, the device of the organic wastewater treatment system containing the oil suspension is the main storage tank 5
Only a little space is needed for 0, and a little space should be secured. It will be useful because it can be easily installed in existing restaurants. Furthermore, the oil suspension 5 captured during the above business hours
During non-business hours such as nighttime, the air is supplied into the storage tank 5 while stirring, and the temperature is raised to prepare an environment in which the oil-and-fat-digesting bacteria are likely to act and perform decomposition treatment. Despite its small size and simple structure, the filtration process and the biological decomposition process are successfully combined to complete a complete closed system, resulting in an extremely excellent system and processing method.
If a static electricity generator is provided and the filter material 9 is forcibly charged to the (-) side, an adsorption treatment is added to the filtration process to capture oil turbidity in the filter material 9, and a more excellent system and treatment. Can be on the way. During non-business hours such as nighttime, it is possible to spend a certain amount of time on a batch process for degrading oil-and-fat digestive bacteria, thus reducing the initial cost. Since the solid content of the oil suspension 5 accumulated during the business hours can be batch-processed over time, the solid content can be decomposed and removed cleanly. Further, since it is an efficient combination of the filtration operation and the biological decomposition operation, it becomes possible to keep the operating cost low. BOD load of wastewater is high in restaurants and so on, and small-scale wastewater containing oil turbidity, which has been regarded as difficult to process because it has been drained without a combined septic tank, is not only economical but also processing performance. From the aspect, the system and processing method are excellent enough to be applied.

(2) Embodiment 2 In this embodiment, as shown in FIGS. 4 and 5, an oil turbidity-containing organic wastewater treatment system and an oil turbidity-containing organic wastewater treatment system in which a stirrer 20 is separately installed as a stirring means in a storage tank 50. It is a wastewater treatment method. Although the periphery of the storage tank 5 is drawn in FIG. 4, the portions not shown are basically the same as those in FIG. In the stirrer 20, the vertical shaft 22 is provided with blades 23 having a predetermined shape, and the speed reducer 21 and the motor 20a are connected to the shaft 22. A baffle plate (not shown) is provided in the storage tank as needed to improve the stirring efficiency. When the motor 20a operates, the blades 23 are rotated to give swirling flow, axial flow, and radial flow to the filter material 9 and the residual drainage 3 in the storage tank 50. By stirring, the solid content of the oil suspension 5 is released from the filter material 9, and the contact time with the oil and fat-digesting bacteria 7 is increased, and the inside of the tank is homogenized by stirring and mixing,
According to the first embodiment, the oil-and-fat digestive bacteria 7 are further decomposed into oil suspensions. Further, since the stirrer 20 as the stirring means is installed, the control unit 100 becomes as shown in FIG.
In addition to the heater driving unit 122 and the fan driving unit 124 that operate with the output of the timer unit 101 being a High signal, a driving unit 120 that operates the agitator driving unit 121 is provided. In addition, in the method for treating organic wastewater containing oil turbidity, it takes 2 hours.
At 3 o'clock, the timer unit 101 outputs a High signal, the heater driving unit 122 turns on the semiconductor switch 72 to heat the heater 74, and the filtering material 9 in the storage tank 50,
While warming the drainage 3, the fan drive unit 124 operates the fan 60 to send the air flow from the tip of the nozzle 64 via the blower pipe 62 and the discharge unit 64, and at the same time, the agitator drive unit 121 works to drive the agitator motor 20. Turning the. The rest of the configuration is the same as that of the first embodiment, and its explanation is omitted. The same reference numerals as in the first embodiment indicate the same or corresponding parts. In the oil turbidity-containing organic wastewater treatment system and the oil turbidity-containing organic wastewater treatment method configured as described above, the stirring and mixing effects are higher than those in the first embodiment, and thus the oil turbidity adhered to the filter material 9 in the purification process at night or the like. Thing 5
Is released smoothly, and the decomposition process of bacteria by the stirrer 20 is further promoted.

The present invention is not limited to those shown in the above-mentioned embodiment, but can be variously modified within the scope of the present invention depending on the purpose and application. Storage tank 50, oil and fat digesting bacteria 7,
The shape, size, material, mechanism, property, etc. of the filter material 9, heating means, air supply means, stirring means, control means, etc. can be appropriately selected according to the application. The present invention was developed exclusively for purifying wastewater containing oil suspension in grease traps of restaurants and the like, but is not limited to this. The solid content related to the oil suspension of the present invention includes solid oil content contained in the waste water, solid content of other organic matter, suspended particles and the like. In addition to the liquid oil, the liquid oil related to the oil suspension includes other organic substances,
The concept includes proteins, sugars, starches, and other synthetic fibers. Although the small-scale drainage of a restaurant has been described in the embodiment, the present invention can be applied to any small-scale drainage having an average daily drainage of less than 50 tons, such as places where commercial kitchens are located and hospitals.

[0027]

INDUSTRIAL APPLICABILITY As described above, the oil turbidity-containing organic wastewater treatment system and the oil turbidity-containing organic wastewater treatment method of the present invention enable continuous treatment of wastewater during business hours during the day in restaurants and the like. , The solid oil that cannot be processed during the day is stored by a filtration operation, and the oil digestion of the oil-and-fat digestive bacteria 7 is decomposed during non-business hours such as night, and thus, the business hours and non-business hours Since it can be used properly for purification treatment, not only can the treatment equipment be compact and the initial cost can be kept low, but also biological treatment and filtration treatment can be effectively combined to reduce running costs. It is possible to achieve excellent effects.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an oil turbidity-containing organic wastewater treatment system according to a first embodiment.

FIG. 2 is a block diagram showing a control unit of FIG.

FIG. 3 is a time chart of each unit of the control unit shown in FIG.

FIG. 4 is a configuration diagram of a main part of an oil turbidity-containing organic wastewater treatment system according to a second embodiment.

5 is a block diagram showing a control unit of FIG. 4. FIG.

[Explanation of symbols]

7 oil suspension 9 Filter material (physical filter material) 10 grease trap 18 inlet piping 20 Stirrer (stirring means) 50 storage tanks 60 fan (air supply means) 66 nozzles (stirring means) 74 Heater (heating means) 85 Outlet pipe

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) E03F 5/16 B01D 29/08 530D 540A

Claims (2)

[Claims] 1. A storage tank comprising an inlet pipe for inflowing wastewater containing oil turbidity and an outlet pipe for treating and discharging the wastewater, wherein the reservoir tank contains oil-digesting bacteria and physical Physical filtration material, heating means for heating the physical filtration material and waste water accumulated in the storage tank, air supply means for supplying air to the physical filtration material and the waste water, and the physical filtration material An oil turbidity-containing material, comprising: an agitating means for agitating the excess material and the drainage, and a control means for operating the heating means, the air supplying means and the agitating means for a predetermined time after stopping for a predetermined time. Organic wastewater treatment system. 2. A filter for injecting waste water containing an oil suspension into a storage tank, continuously purifying and discharging the oil suspension for a predetermined period of time by a physical filter operation in addition to the decomposition of the oil suspension by a fat-and-oil digestive bacterium. After stopping the excess process and the injection of wastewater containing oil turbidity into the storage tank, the wastewater and the filtration material accumulated in the storage tank are heated by the heating means, stirred by the stirring means, and further by the air supply means. A method for treating organic wastewater containing oil turbidity, comprising the step of supplying air to them to purify the oil turbidity mainly captured by the filtration material by oil and fat digestive bacteria.