JPS5825518B2 - Waterfall coagulation separation equipment for oil in wastewater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for aerating and coagulating oil contained in domestic wastewater in a single tank, and in particular, it effectively and effectively transforms oil scum into spheres and separates it to purify wastewater. This invention relates to an aeration coagulation separation device for oil in wastewater that is ideal for pollution prevention, resource saving, and energy saving, and can be recycled and used.

Conventionally, domestic wastewater from specific facilities such as cafeterias, school lunch centers, restaurants, hotels, and inns contains oil and other impurities, so in order to prevent pollution, these wastewaters are led to an oil separation tank equipped with a baffle plate to float the oil. The floating oil was pumped up and transferred to an oil storage tank for disposal, but with this method, food scraps would settle and rot in the oil separation tank, and floating substances other than oil would form, forming scum, which would become a source of flies and other pests. became.

In addition, the foul odor of toxic gas produced by decomposition was causing secondary pollution.

Over the years, I had used a vacuum truck several times to clean the scum from the oil separation tank, but it was incomplete and the waste water was not purified enough, so I needed help with other treatments.

There was also a defect in the equipment that allowed leaked oil to accumulate on the walls of the drainage pipes, causing them to become clogged.

In recent years, there has been a ``pressure flotation method'' that has advanced this method, but this method requires that the floating oil be pumped up and the purification of the wastewater is insufficient.

Recently, the standards for N-hexane extract, that is, the oil content in wastewater, are the standards of the Prime Minister's Office Ordinance establishing wastewater standards under the Water Pollution Control Act for specific facilities that produce 50 tons or more of wastewater per day. III) As local governments impose stricter regulations on waste water, it has become difficult to obtain wastewater that passes the standards using conventional methods.

Therefore, in order to comply with these high standards, prevent pollution, conserve energy, and conserve resources, there has been a deep desire for a device that can produce recyclable clean wastewater in a manner that does not require as much labor as possible.

Therefore, the object of the present invention is to economically obtain wastewater in a single tank that does not cause secondary pollution such as bad odors, does not require the removal of floating oil scum, and has a sufficient cleanliness value suitable for recycling. An object of the present invention is to provide an aeration coagulation separation device for oil in wastewater, which is suitable for pollution prevention, resource saving, and energy saving.

Other objects and features of the present invention will become apparent from the following description and accompanying drawings.

The present invention will be described below with reference to the drawings.

FIG. 1 is an explanatory cross-sectional elevation view showing one embodiment of the apparatus of the present invention, and FIG. 2 is an explanatory cross-sectional side view similarly showing air bubbles and water flow.

In Figure 1, 1 is a tank made of a rigid body capable of processing large volumes of wastewater such as F, R, P, concrete, etc., which has an approximately cylindrical shape and a polygonal cylindrical cross section. It enters the tank through pipe 2.

Controller (not shown) is connected to the inlet pipe using code 4.
There is a sensor 3 connected to the drain, so that when wastewater stops flowing, aeration, coagulation, and separation, which will be described later, are performed intermittently.

The tank 1 is divided into several sections by a plurality of rectifying baffle plates 7, 7', 7'' which have space alternately above and below, and when the wastewater enters through the sensor 3 of the inflow pipe 2, the wastewater flows quietly into a laminar flow. The oil 6 passes through this section and floats to the water surface 5, and rice grains etc. are separated to the bottom of the tank.Finally, the interaction between the baffle plate 9 and the oil scum baffle plate 10 intercepts the oil scum, which remains in the tank and is purified. The wastewater is discharged from the discharge pipe 1.
1 and is discharged.

Next, the aeration flocculation separation using a single tank, which is performed intermittently using the bone material of the present invention, will be described below.

Conventional oil separation tanks not only require extra manpower to scoop up the floating oil and transfer it to the oil storage tank, but also cause secondary pollution due to decay, etc., as described above.

In this device, in order to perform aeration, flocculation, and separation intermittently in a single tank, the following steps are taken.

That is, the tank is made into a substantially cylindrical shape, and a differential user attached to a wall slightly offset from the bottom with a bracket 13 is installed.When there is no inflow of wastewater, that is, intermittently, the sensor 3 of the inflow pipe 2 detects air bubbles from the differential user 8. When water is released, the air lift effect caused by the air bubbles causes the wastewater to rise and be guided to the wall, where it moves in a circular motion as shown in Figure 2, and the air bubbles come into contact with oil and other substances efficiently.

As a result, organic matter such as rice grains in the wastewater is oxidized and decomposed, and oil in the wastewater comes into rotational contact with each other due to the flow, and together with the action of microbial detergent slag in the wastewater, it grows into a ball shape.

According to experiments, this growth can reach a ball of about 5 cm in six months to a year, so if necessary, it can be easily scooped up automatically with a net (not shown) from the manhole 12, and later disposal is also easy. .

In this way, the organic matter in the wastewater is oxidized and decomposed, and the oil is solidified into balls and removed, so the components of the wastewater are highly purified and can be recycled and reused.

Furthermore, when a small amount of a flocculant such as aluminum sulfate or a cleaning agent such as activated sludge is added during aeration, flocculation, and separation, the additive will adhere to and grow on the balls, and the wastewater may be further purified.

This device has a single tank, has a simple structure, is easy to manufacture, and is inexpensive.Although the operation is intermittent and simple, it is extremely effective.It aerates organic waste such as oil in a single tank when not in use, such as at night. , agglomeration and separation treatment to prevent harmful odors and the generation of pests, and to separate the oil into harmless and odorless waste oil balls, making it easier to handle so that you only need to take out the waste oil balls once or twice a year. Moreover, it has the effect of highly cleaning wastewater and making it recyclable, contributing to pollution prevention, resource saving, and energy saving.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional elevational view showing the structure of an embodiment of the present invention, and FIG. 2 is an explanatory cross-sectional side view of FIG. 1 AA' of the present apparatus. Next, the main symbols in the figure and the parts they indicate are shown. 1... Tank, 2... Inflow pipe, 3... Sensor, 4...
... code, 5 ... water surface, 6 ... oil, 7 ... rectifying bubble plate, 8 ... differential user, 9 ... baffle plate, 10 ... oil scum baffle plate, 11 ...
・Discharge pipe, 12...manhole, 13...bracket.

Claims (1)

[Claims] 1 A horizontally placed approximately cylindrical tank 1 has an inflow pipe 2 having a sensor 3 that allows wastewater to flow into one end in the axial direction, and a discharge pipe that discharges the wastewater from which oil has been separated at the other end of the tank 1. 11, and a plurality of rectifying baffle plates installed vertically with space alternately above and below in order to flow the wastewater that has flowed into the tank in an upward and downward zigzag pattern7. 7' and 7'', and the compartments substantially separated by the rectifying baffle plate each have a differential user 8.8 that blows out air bubbles provided at a position slightly offset from the bottom of the compartment.
8"8"', and when there is no inflow of wastewater such as at night, the air lift effect of air bubbles blown out from this differential user causes the wastewater in the compartment to rotate along the peripheral wall, and the oil in the wastewater is aerated and coagulated and separated. A baffle plate 9 and oil are used to form a waste oil ball, and on the other hand, when the wastewater flows in, the purified wastewater is sequentially moved through the compartment, and finally the separated oil scum is stopped in the tank by interaction and drained. A device for aeration and agglomeration of oil in wastewater consisting of a single tank characterized by a structure having a scum baffle plate 10 in front of a discharge pipe.