JPH0225458Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a simple water purification device that does not require any power during all processes.

[Prior art]

Generally, the treatment process for water purification equipment involves a coagulation operation in which a flocculant is injected into raw water, stirred and mixed to react with turbid components in the raw water, and form fine flocs. A floc growth operation in which flocs grow into large-diameter flocs with slow stirring, a sedimentation operation to separate the grown large-diameter flocs, a control over the supernatant water that flows out during this sedimentation operation, and backwashing of the overtank. Various operations such as backwashing are required.

[Problem that the invention attempts to solve]

However, each of the above operations requires some kind of power, and although efforts have been made to reduce overall energy consumption, it has not been possible to make all of the operations non-powered.

The present invention aims to provide a simple water purification device that does not require any power during all of the above-mentioned operations, and can obtain clear superfluous water with only a minimum of manual operations.

[Means for solving problems]

This invention establishes a water level difference so that the raw water flows down naturally, and connects the flow-through type coagulation tank, flow-through type floc growth tank, sedimentation tank, and automatic backwash type filter tank in sequence, and the automatic backwash type filtration tank. The tank has a plurality of overchambers, a common distribution ronda above which guides the supernatant liquid of the sedimentation tank, and a common overchamber having a water level higher than a drainage trough disposed in each overchamber below the overchambers. This is a water purification device characterized by being provided with a water chamber.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. 1 is a flow-through type flocculation tank, which is provided with fins 2 for promoting stirring and flocculation, and at its inlet is a raw water inflow pipe 3.
A drip-type chemical injection pipe 4 is opened at the inlet of the flow-through type coagulation tank 1 or at the raw water inflow pipe 3 . The terminal end of the flow-through type flocculation tank 1 is connected to a flow-through type floc growth tank 5 which maintains a water level difference such that raw water containing fine flocs flows naturally into it. A plurality of diversion plates 6 are arranged so that raw water containing aggregated flocs flows in a detour.
is installed. The terminal end of the floc growth tank 5 is connected to a sedimentation tank 7 which maintains a water level difference such that water containing grown flocs naturally flows in, and this sedimentation tank 7 is equipped with an inclined plate 8 or the like to enhance the sedimentation effect. It is preferable to arrange it. Further, the outflow trough 9 of the settling tank 7 is connected to an automatic backwash type filter tank 11 which maintains a water level difference such that the supernatant water of the settling tank 7 naturally flows in through an outflow pipe 10.

As shown in the illustrated example, this automatic backwash type filter tank 11 has a distribution launder 12 installed at the top to receive water flowing out from the outflow pipe 10, and the distribution launder 12 has 4 to 6 compartments formed at the bottom thereof. A distribution weir 14 is provided for distributing water to each chamber 13, and a sand layer 15, a gravel layer 16, and a drainage trough 17 are provided in each chamber 13, and the drainage trough 17 has a valve 1.
8 and a drainage pipe 19 to a drainage ditch 20. In addition, each filter chamber 13 of the automatic backwash type filter tank 11
An overflow chamber 21 is provided at the bottom of the drain trough 17, and is connected to an overwater outflow section 22 via an outflow weir 22 whose top is raised by h above the drainage trough 17, and an overflow outflow pipe 24 is connected to an overflow outflow section 23. has been done.

Next, to explain its operation, raw water led from the raw water inflow pipe 3 flows into the flow-through type coagulation tank 1, and necessary chemicals are dripped in from the chemical injection pipe 4. The chemicals to be injected include flocculants such as sulfuric acid,
A chlorine agent such as sodium hypochlorite is used.
Then, while the raw water flows through the flow-through flocculation tank 1 together with the injected chemicals, it is stirred by the fins 2.
Coagulation takes place to form fine agglomerated flocs.

The raw water containing fine aggregated flocs flows into the floc growth tank 5 due to the water level difference, and while being detoured by the diversion plate 6, the fine flocs grow into large diameter flocs. The large-diameter flocs flow directly into the settling tank 7 and are precipitated and removed while passing through the inclined plate 8, and the supernatant water flows into the outflow trough 9 and the outflow pipe 1.
Distribution launder 1 of automatic backwash filter tank 11 through 0
2, overflows the distribution weir 14 and flows into each passage chamber 13.
distributed to.

The supernatant liquid of the settling tank 7 distributed to the filter chamber 13 is
The water passes through the sand layer 15 and becomes overwater, passes through the gravel layer 16, collects in the overwater chamber 21, overflows the outflow weir 22, reaches the overwater outflow part 23, and exits the system from the overwater outflow pipe 24. leak.

Also, if the heating is continued for a long time in the heating chamber 13,
A small amount of floc leaked from the sedimentation tank 7 is trapped in the sand layer 15, and the degree of the floc is captured as a rise in the water level in the overchamber 13. When the water level in the filter chamber 13 rises to a specified value, it is necessary to backwash the flocs trapped in the sand layer 15 (backwashing step). When cleaning one of the chambers 4 to 6, when the valve 18 of the chamber 13 is opened,
As shown in FIG.
The water level is lowered to the upper surface of the drainage trough 17. However, 3 to 5 other than the said excessive room 13
Since the overflow chamber is in the middle, those overwater flows from the overwater chamber 21 to the drainage trough 17 due to the water level difference h between the drainage trough 17 and the outflow weir 22,
While the sand layer 15 is made to flow, the trapped flocs are washed away by an upward flow, and the waste water after washing is collected in a drain trough 17 and discharged to a drain 20 through a valve 18 and a drain pipe 19. When the water discharged into the drain 20 is clean, the valve 18 is closed to complete the cleaning. At this time, the supernatant water of the settling tank 7 overflows the distribution weir 14 from the continuous distribution ronda 12 and flows into the overflow chamber 13, so the overflow state returns as it is.

In addition, as an example of the arrangement of the above-mentioned configuration,
As shown in FIG. 3, a flow-through flocculation tank 1 is provided around the floc growth tank 5 and the settling tank 7, so that the entire system can be made compact.

In this way, each processing operation of the flow-through coagulation tank 1, floc growth tank 5, settling tank 7, and automatic backwashing tank 11 is performed without requiring an external power source. The tanks are connected so that the water flows down sequentially depending on the water level difference,
Overall, clear superwater can be obtained with minimal manual operations.

[Effect of idea]

As described above, according to the present invention, clear water can be obtained through the water purification processes of flocculation, floc growth, precipitation, and filtration without the need for power at all and by utilizing natural flow with minimal manual operations. This has the effect of being extremely useful in practice.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is an explanatory diagram of the overall configuration, Fig. 2 is a longitudinal sectional illustration of an automatic backwash type filter tank, and Fig. 3 is a plan view showing an example of the overall arrangement. be. DESCRIPTION OF SYMBOLS 1... Flow-through flocculation tank, 2... Fin, 3... Raw water inflow pipe, 4... Chemical injection pipe, 5... Flock growth tank, 6... Diversion plate, 7... Sedimentation tank, 8... ... Inclined plate, 9 ... Outflow trough, 10 ... Outflow pipe, 11 ...
...Automatic backwash type filter tank, 12...Distribution rhonda, 13
...Over chamber, 14...Distribution weir, 15...Sand layer,
16... Gravel layer, 17... Drainage trough, 18...
Valve, 19...Drain pipe, 20...Drain ditch, 21...
Overwater chamber, 22... Outflow weir, 23... Overwater outflow section, 24... Overwater outflow pipe.

Claims (1)

[Scope of utility model registration request] A flow-through flocculation tank, a flow-through floc growth tank, a sedimentation tank, and an automatic backwashing filter tank are connected in sequence by providing a water level difference so that the raw water flows down naturally, and the automatic backwashing tank is connected to a plurality of A common distribution ronda for guiding the supernatant liquid of the sedimentation tank is provided above, and a common overwater chamber having a water level higher than the drainage trough provided in each of the overchambers is provided below the overchamber. A water purification device characterized by: