JPS588395Y2 - water treatment equipment - Google Patents

Description

[Detailed description of the invention] The present invention provides a deep downward flow path and an upward flow path connected to the deep downward flow path, and also provides a pump flow path from the upward flow path to the downward flow path. The present invention relates to a water treatment apparatus configured to circulate water in the three flow paths, and provided with an air supply path for supplying oxygen-containing gas into the water to be treated in the descending flow path.

The above equipment dissolves a large amount of oxygen-containing gas into the water to be treated, and efficiently improves pollution indicators such as biochemical oxygen demand due to activated sludge, while maintaining a high throughput per volume. It has the advantage of being

To consider the upward displacement state of the water level in the descending flow path at the time of starting operation of this water treatment equipment, first, when the water level in the upstream and downstream channels is at the same level and the operation is stopped, the water to be treated is pumped by driving the pump. Due to the circulating flow across the three channels, the water level in the descending channel rises from the first water surface level to the second water surface level, and the oxygen-containing gas is directed downward in the descending channel along with the circulating flow. By supplying the oxygen-containing gas for dissolving the oxygen gas in the water to be treated, the apparent density of the water to be treated decreases, thereby raising the water surface level in the downward flow path to the third water surface level.

In such a situation where the water surface level in the descending channel fluctuates, in order to supply oxygen-containing gas into the water to be treated in the descending channel, the gas discharge position must be adjusted to at least the second position of the first rising channel.
It is necessary to set the location below the water surface level, and for this purpose, under steady operating conditions, oxygen-containing gas must be blown into the descending flow path by applying a pressure greater than the head difference between the second and third water surface levels. 1, and the power consumption for this was enormous, making it uneconomical.

In view of the above-mentioned circumstances, the present invention aims to enable economical operation of water treatment through extremely simple improvements.

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

For example, 100
A descending channel A and an ascending channel B having a level difference of m are formed, a tank 3 is connected to the upper part of the ascending channel B, and a channel C equipped with a pump P is descended from the tank 3. A device 4 for solid-liquid separation of treated water is connected to the tank 3, and a return pipe 5 for activated sludge from the tank 3 is connected across the flow path A, and a supply pipe 6 for water to be treated such as urban sewage; and the air supply passages 8 of the oxygen-containing gas supply device I are respectively connected to the downflow passage A, so that the water to be treated containing activated sludge is circulated through the three passages A, B, and C. This constitutes a water treatment device that supplies oxygen-containing gas into the water to be treated in the downward flow path A.

The oxygen-containing gas supply device I is configured such that the water level is above the first water level L1 of the descending channel A when the operation is stopped, and below the second water level L2 when only the pump P is driven. is provided with a first gas discharge port a, and is lower than the third water surface level L3 when the pump P is in a driving state and oxygen-containing gas is supplied from the first gas discharge port a, and is at the second water surface level. 2nd above L2
A gas discharge port is provided, and each of the discharge ports a and b is connected in parallel to a supply air blower 9 via air supply passages 8 and 8, and an electromagnetic type is connected to each of the supply passages 8 and 8. An on-off valve 10 is provided, so that the discharge position of the oxygen-containing gas relative to the downward passage A can be changed upward or downward by selectively opening the on-off valve 10.10.

Mechanisms 11a and 11b for detecting fluctuations in the second and third water surface levels L2 and L3 are provided, and a controller 10a for the second water level detection mechanism 11a and the first gas discharge on-off valve 10 is provided, and a third Water surface level detection mechanism 11b and second
The controllers 10b of the gas discharge on-off valves 10 are electrically linked to each other so as to open the valves in a contradictory manner, and the oxygen is automatically switched to steady operation in which the third water surface level L3 is maintained. A gas discharge position vertical change mechanism 12 is configured to switch and supply the contained gas from the second gas discharge port.

In addition, it is also possible to provide a three-way valve type flow path switching on-off valve 10 at the parallel connection of the air supply paths 8, 8 to the air supply blower 9, and thereby change the gas discharge position up and down. The on-off valve 10 may be manually operated to manually change the discharge position of the oxygen-containing gas up and down, or the supply device I may be driven after a set time has elapsed after the pump P is driven. In addition, this gas supply device I
After a set time has elapsed after driving, program control or timer control may be used to automatically switch the discharge position of the oxygen-containing gas from the first gas discharge port a to the second gas discharge position, that is, change the vertical position of the gas. The mechanism 12 can be modified in various ways.

In summary, the present invention provides a water treatment apparatus as described above, in which the oxygen-containing gas supply device and the pumping pump are located above the first water surface level of the descending channel when the pump is stopped. The second time when driving only
The first gas discharge port of the air supply path is provided below the water surface level, and the first gas discharge port of the air supply path is provided below the third water surface level in the driving state of the oxygen-containing gas supply device and the water pump, and is located below the second water surface. The second gas discharge port of the air supply path is provided above the level, and the discharge position of the oxygen-containing gas with respect to the downward flow path can be changed up and down.

In other words, by changing the discharge position of oxygen-containing gas upward in response to fluctuations in the water surface level due to the supply of oxygen-containing gas, it is possible to avoid supplying oxygen-containing gas at a discharge pressure higher than necessary during steady operation. It has become possible to operate water treatment economically with extremely simple improvements.

[Brief explanation of drawings]

The drawing is a schematic overall longitudinal side view illustrating an embodiment of the water treatment device according to the present invention. I...Oxygen-containing gas supply device, 8...
Air supply path, 10... Open/close valve, 11a, 11b...
...Level fluctuation detection mechanism, A...Descent flow path, B...Rise flow path, C...Pump flow path, P...Pumping water Pump, Ll, L2゜L3...
...Water level, a, b...Gas discharge port.

Claims (1)

[Claims for Utility Model Registration] 1. A deep downward flow path A and an upward flow path B connected thereto are provided, and a pump flow path C is provided for pumping water from the upward flow path B to the downward flow path A, and activated sludge is The water to be treated containing the three flow paths A, 13. C. A water treatment device configured to circulate the oxygen-containing gas in the water to be treated, and provided with an air supply path 8 for supplying oxygen-containing gas into the water to be treated in the downward flow path A, the oxygen-containing gas supply device 7
The air supply path is located above the first water surface level L1 of the descending flow path when the pump P is not driven, and below the second water surface level L2 when only the pump P is driven. 8 first gas discharge ports a are provided below the third water surface level L3 and above the second level L2 in the driving state of the oxygen-containing gas supply device I and the water pump P. Air supply path 8
A water treatment device characterized in that a second gas discharge port is provided so that the discharge position of the oxygen-containing gas relative to the downward flow path A can be changed upward or downward. 2. The device according to claim 1, wherein the air supply passages 8, 8 are provided with a manually operated on-off valve 10 for switching the gas discharge position. 3 Mechanism 1 for detecting water level fluctuations in the descending channel A
1a and 11b are provided, and the oxygen-containing gas is supplied from the first gas discharge port a based on the detection of the second water level L2 by the detection mechanism 11a, and the second water level is supplied based on the detection of the third water level L3. 2. The device according to claim 1, which is characterized by being provided with a mechanism for switching and supplying oxygen-containing gas from the discharge port. 4. The scope of the utility model registration claim, characterized in that a mechanism is provided for automatically switching the gas discharge position from the first gas discharge port a to the second gas discharge port after the set time of driving the gas supply device has elapsed. Apparatus according to paragraph 1. 5. The device according to claim 4, which is a registered utility model, further comprising a mechanism for automatically driving the gas supply device 7 after a set time period for driving the water pump has elapsed.