JP3265332B2 - Wastewater treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment apparatus containing a relatively low concentration of an organic compound.

[0002]

2. Description of the Related Art As a treatment apparatus for wastewater containing a relatively low concentration of organic compounds, wastewater is generally subjected to adsorption treatment using activated carbon such as granular coal or crushed coal. For example, an organic matter removing device for a golf course wastewater, a container filled with activated carbon is installed in a hot water tank, and the wastewater in the storage tank is passed through the container using a pump, and the wastewater is brought into contact with the activated carbon. A so-called power-flow type wastewater treatment apparatus that performs treatment and discharges the outside of the system is used. In addition, an activated carbon adsorber is provided in the middle of the wastewater channel from the storage tank, so that the wastewater is passed through the activated carbon adsorber by natural flow of wastewater without using power, and the wastewater is treated and discharged outside the system. Wastewater treatment equipment has been widely used because of its low operating cost.

[0003]

However, the above-mentioned gravity-flow type wastewater treatment apparatus has the advantage of low operating cost, but, on the other hand, floating substances contained in the wastewater with the passage of time and By microorganisms bred in activated carbon,
There is a problem that the gap between the activated carbons is closed, and the treatment becomes impossible.

[0004] The present invention has been made in view of the above-mentioned problems, and has a low operating cost, does not block the gap between activated carbons by suspended matter and microorganisms in wastewater, and provides a stable treatment for a long period of time. It is an object of the present invention to provide a possible wastewater treatment apparatus at a low cost.

[0005]

The structure of the present invention for achieving the above object will be described with reference to FIGS. 1 and 2 corresponding to an embodiment. The present invention provides a raw water inlet 3 at the bottom of a housing. Activated carbon 2 is filled in the upper part of the housing, and the activated carbon adsorber 1 provided with the treated water outflow pipe 6 on the upper part thereof is submerged in the storage tank 4, and the end of the treated water outflow pipe 6 is activated carbon. A drain valve 8 for extracting the suspended matter collected at the bottom of the storage tank 4 to the outside of the system is positioned at the bottom of the storage tank 4. Technical measures are taken to discharge the liquid out of the system through the activated carbon adsorber 1 by the siphon phenomenon.

[0006]

According to the present invention, when the raw water 9 flows into the storage tank 4 from the raw water inflow pipe 5 by the means described above, the raw water 9 is supplied to the lower part of the vertical columnar activated carbon adsorber 1 installed inside the tank 4. It passes through the activated carbon packed bed 2 above the activated carbon adsorber 1 as an upward flow via the water inlet 3. At this time, the relatively small floating organic matter contained in the raw water 9 is adsorbed and removed from the raw water 9 by coming into contact with the activated carbon in the activated carbon packed bed 2. The relatively large suspended matter contained in the raw water 9 is not sucked up to the activated carbon packed bed 2 due to the weak suction force of the siphon phenomenon and the activated carbon packed bed 2 provided above the activated carbon adsorber 1, and remains in the storage tank 4. Settles to the bottom by its own weight. Therefore, the activated carbon filling tank 2 is required to achieve this purpose.
It has a sufficient height with respect to the bottom surface, and prevents the activated carbon filling tank 2 from being clogged by floating substances having a large diameter. The treated water 10 that has passed through the activated carbon packed bed 2 is discharged from the treated water outflow pipe 6 to the outside of the system by a siphon phenomenon.

[0007] Even after the inflow of the raw water 9 is stopped, the treated water outflow pipe 6 functions as a siphon pipe and the storage tank 4
The processing of the raw water 9 stored in the tank is continued. Then, when the water level of the storage tank 4 is lowered to the level of the raw water inlet 3, the air flows into the activated carbon adsorber 1 having a columnar shape, so that the siphon is broken and the processing is stopped. Here, the inflowing air forms a foam and passes through the activated carbon packed bed 2 at a high speed while winding up the activated carbon. After the siphon is destroyed, the raw water remaining in the columnar activated carbon adsorber 1 flows back from the raw water inlet 3 to the storage tank 4. The lifting of the activated carbon and the backflow of the raw water have the effect of backwashing the activated carbon packed bed 2 and prevent the activated carbon from being blocked by flocs of suspended matter and microorganisms. Moreover, since raw water is drained from the activated carbon packed bed 2 when water is not passed, the number of microorganisms that propagate in the activated carbon packed bed 2 can be significantly reduced.

The raw water 9 and relatively large suspended matter remaining below the raw water inlet 3 in the storage tank 4 are discharged outside the system through the opening of the drain valve 8, so that the suspended matter separated by the backwashing is activated carbon again. Does not adhere to

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. Reference numeral 4 denotes a raw water inlet 5 through which raw water 9 containing a relatively low concentration of organic compounds flows, a drain valve 8 through which treated water is discharged at the bottom, and a projection above the surface of the raw water 9. Drain pipe 7 having a substantially L-shaped cross section having a vertical pipe
Is a storage tank placed horizontally. A drain valve 8 for discharging relatively large suspended matter collected at the bottom is attached to an end of a drain pipe 7 provided at the bottom of the storage tank 4.
Reference numeral 1 denotes a column-shaped activated carbon adsorber. The activated carbon adsorber 1 is divided into two parts in the height direction. An activated carbon packed layer 2 is formed in an upper part, a cavity is formed in a lower part, and a vicinity of the bottom is formed. A plurality of raw water inlets 3 are formed outside the cavity of the activated carbon adsorber 1. A treated water outflow pipe 6 is connected to the upper end of the activated carbon adsorber 1, and the treated water outflow pipe 6 is traversed in the tank 4, and then discharges and sucks air provided in the storage tank 4. The raw water enters the vertical pipe, hangs down the vertical pipe, and is positioned at the end of the treated water outflow pipe 6 equal to or less than the raw water inlet 3 provided in the activated carbon adsorber 1.

When the raw water 9 flows in from the raw water inflow pipe 5 and reaches the highest treated water outflow pipe 6 which has been drawn horizontally, it flows down naturally and the activated carbon adsorber 1 and the treated water outflow pipe 6 Of the raw water 9 is discharged from the end of the treated water outflow pipe 6 and the organic compound of the raw water 9 is discharged by the siphon phenomenon.
And the treated water 10 is drained. Then, when the raw water 9 up to the raw water inlet 3 provided in the lower part of the activated carbon adsorber 1 is subjected to the adsorption treatment by the siphon phenomenon, the siphon is destroyed and the treatment is stopped. Raw water 9 and relatively large suspended matter remaining below the raw water inlet 3 in the storage tank 4 are discharged out of the system by the opening of the drain valve 8.

EXAMPLE As an example of the present invention, a performance test of an activated carbon adsorber having a structure similar to that of FIG. Table 1 shows the use of the activated carbon adsorber. Table 2 shows the maximum and minimum pesticide concentrations of raw water and treated water during the test period. The test results show that the treated water quality has maintained a sufficiently low pesticide concentration, as shown in Table 2, although six months have elapsed since the start of the experiment. Regarding the water flow performance, since the pressure loss by the present device did not reach the level that hinders water flow during the experimental period, it is judged that the present device worked well and prevented the clogging of the activated carbon.

[0012]

[Table 1]

[0013]

[Table 2]

[0014]

According to the present invention, an activated carbon adsorber 1 having a raw water inflow port 3 at the bottom of a casing, an activated carbon 2 filled at an upper portion of the casing, and a treated water outflow pipe 6 provided at an upper portion thereof is stored. Submerged in the tank 4, the treated water outflow pipe 6 end is positioned at or below the raw water inlet 3 provided in the activated carbon adsorber 1, and the suspended matter collected at the bottom of the storage tank 4 is drawn out of the system. The drainage valve 8 is located at the bottom and the liquid in the storage tank 4 is discharged outside the system by the siphon phenomenon via the activated carbon adsorber 1, so that the operation cost is low and wastewater is used. It is possible to provide a wastewater treatment apparatus in which a gap between activated carbons is not closed by suspended matters and microorganisms, and can be stably treated for a long period of time.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG. 1;

[Explanation of symbols]

1. Activated carbon adsorber 2. Activated carbon packed bed 3. Raw water inlet 4. Storage tank 5. Raw water inflow pipe 6. 6. Treated water outflow pipe Drain pipe 8. Drain valve 9. Raw water 10. Treated water

Continued on the front page (72) Inventor Toshimitsu Ishida 2736 Sezaki-cho, Kurayoshi-shi, Tottori Pref. Ishida Industries Co., Ltd. (72) Inventor Akira Nakamura 3-1, Kanda Surugadai, Chiyoda-ku, Tokyo 2 Hitachi Chemical Techno Plant Co., Ltd. (72) Inventor Takashi Takahashi 3-1-1 Kanda Surugadai, Chiyoda-ku Tokyo 2 Examiner Ryoko Masuda (56) References JP-A-57-87808 (JP, A) JP-A-4-267905 (JP, A) JP-A-56-67506 (JP, A) JP-A-5-161804 (JP) , A) Hira 4-70185 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) C02F 1/28 B01D 35/02 B01D 23/00-23/28

Claims (1)

(57) [Claims] 1. An activated carbon adsorber 1 having a raw water inflow port 3 provided at the bottom of a housing, an activated carbon 2 filled at an upper portion of the housing, and a treated water outflow pipe 6 provided at an upper portion thereof. Water to drain the treated water outflow pipe 6 at the end of the raw water inlet 3 provided in the activated carbon adsorber 1 at a level equal to or less than the raw water inlet 3 and to drain suspended matter collected at the bottom of the storage tank 4 to the outside of the system. A wastewater treatment apparatus characterized in that a valve (8) is located at the bottom and a liquid in a storage tank (4) is discharged out of the system by a siphon phenomenon via an activated carbon adsorber (1).