JPH0463191A - Biological activated-carbon filter - Google Patents

Abstract

PURPOSE:To save clean water, to reduce the wear of a filter medium and to surely propagate microbes on the filter medium surface by comparing the period determined as an increase in pressure drop with a set period and providing a controller for actuating a surface layer part cleaning device or an entire medium cleaning device. CONSTITUTION:This biological activated-carbon filter consists of a sensor 4 for detecting an increase of the pressure drop in the filter above a given value, a surface part washing valve 8, a washing valve 10 and an air cleaning valve 9. When the pressure drop is increased and a water level detector 4 is actuated, whether the surface layer cleaning period is above the set value or not is determined by the controller 14, and the surface layer part is cleaned when the period is above the set value. When the period is below the set value, the entire medium is cleaned. If the period is below the set value, an alarm of defective cleaning is outputted since the more automatic cleaning means are not provided to this system to urge manual cleaning by an operator or other countermeasures for abnormality.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a biological activated carbon filtration device.

(Prior technology) The biological activated carbon filtration device that we are targeting this time is of the fixed bed type, in which a tower or tank is filled with granular activated carbon.
This is a filtration device in which the water to be treated is poured and the water that comes out after passing through an activated carbon layer is obtained as treated water. As the water flow time elapses, suspended matter in the water to be treated is captured in the activated carbon layer, so if left as is, it will become completely clogged and water will no longer flow. Therefore, when the pressure loss becomes large to some extent, it is necessary to clean the activated carbon layer.

Normally, in automatic cleaning of a biological activated carbon filtration device, cleaning is started by detecting an increase in pressure loss or by using a timer. However, this only involves washing the surface layer with water or washing the entire body (air washing and water washing) separately.

(Problem to be solved by the invention) Since the cause of pressure loss is often near the surface layer,
Cleaning the entire filter every time the pressure drop increases is wasteful in terms of increased wear on the filter medium and suppression of microbial growth on the surface of the filter medium. Moreover, even if only the surface layer is washed with water every time, it becomes necessary to wash the parts other than the surface layer eventually.

In addition, when starting the cleaning with a timer, cleaning is carried out early with plenty of time before it becomes clogged, so in the long run,
Washing water will be wasted.

The cleaning cycle for biological activated carbon filtration equipment varies depending on the quality of the water to be treated, but by cleaning both the surface layer and the entire body at as long a cycle as possible depending on the water quality, you can conserve cleaning water and use the filter media in the long run. Aims to reduce wear and ensure the growth of microorganisms on the surface of the filter medium.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a filtration tower that filters water to be treated using biological activated carbon, and a cleaning valve installed approximately in the middle of the filtration tower, and the surface portion of the biological activated carbon is rotated in the opposite direction. There is a surface cleaning device that cleans the surface layer, a cleaning valve installed at the bottom of the filtration tower, and an overall cleaning device that cleans the entire filtration tower from the bottom in the reverse direction, and a system that responds to the water pressure to be treated at the top of the filtration tower. Then, when the pressure drop in the filtration tower exceeds a set level, the detector determines that the pressure drop has increased, and the cycle at which this detector determines that the pressure drop has increased is compared with the set cycle, and if the cycle is equal to or higher than the set cycle, the surface cleaning device is activated. This biological activated carbon filtration device is equipped with a controller that operates the entire cleaning device if the cleaning period is shorter than the set period.

(Function) A combination of surface cleaning and general cleaning is performed, taking advantage of the characteristics of each.

First, if a sensor detects a rise in pressure, surface cleaning is usually performed. However, if the cycle of cleaning the surface layer falls below a certain value due to pressure increase, it is assumed that cleaning the surface layer alone is insufficient and that other areas also need cleaning, and a special treatment is performed to clean the entire surface. Similarly, for
When the overall cleaning cycle falls below a certain value, a warning is issued as a special process to prompt the operator to deal with the abnormality.

(Example) Next, an example of the present invention will be described. Figure 1 shows a filtration tower 1 that filters water to be treated using biological activated carbon 2, a water level detector 4 that is attached to the top of the filtration tower 1 to detect a rise in the water to be treated, and a roughly central part of the filtration tower 1. attached to biological activated carbon 2
a surface washing valve 8 used when washing the surface part in the reverse direction; a filtration valve 7 installed at approximately the bottom of the filtration tower l and introducing the water to be treated into the treated water tank 13; and a branch from the filtration valve 7. and a washing valve 1o which is connected in parallel and is used to wash the entire filter tower 1 from the lower part in the reverse direction, and a washing valve which sends the water to be treated from the treated water tank 13 to the washing valve 10 and the surface washing valve 8. A biological activated carbon filtration device is shown that includes a pump 6 and a controller 14 that operates the flush valve IO according to the number of times the surface layer cleaning valve 8 operates.

That is, this embodiment uses biological activated carbon equipped with a sensor that detects when the pressure loss in the filtration device exceeds a certain value, and a surface flush valve 8, a flush valve 10, and an air flush valve 9 as cleaning valves. In a filtration device, when the pressure loss increases, the surface layer is washed with water as a normal process, and when the cycle becomes shorter than the set value.

As special processing, the entire system is automatically cleaned or an alarm is output.

1 is a biological activated carbon tower, which is filled with biological activated carbon 2 and a support material 3. 4 is a water level detector for detecting an increase in pressure loss. 5 is a transfer pump for sending water from the treated water tank 12 to the biological activated carbon tower 1, and 6 is a cleaning pump for cleaning the biological activated carbon tower 1 using water from the treated water tank 13.

7 is a filtration valve for filtration. 8.9.10 are respectively a surface washing valve, an air washing valve, and a water washing valve,
11 is a compressor for the air source.

14 is a controller for automatically performing the functions of the present invention.

FIG. 2 shows a flowchart showing the operation of one embodiment of the present invention.

When the pressure loss increases and the water level detector 4 operates, it is first checked to see if the surface cleaning cycle is greater than or equal to the set value, and if it is greater than or equal to the set value, surface cleaning is performed, and if it is less than the set value, surface cleaning is not enough. If it is insufficient, we consider that other parts also need cleaning and consider cleaning the entire area.

When considering total cleaning, it is checked whether the cleaning cycle is equal to or greater than the set value, and if it is equal to or greater than the set value, complete cleaning is performed.

If it is less than the set value, the current system does not have any more automatic cleaning means, so it outputs a "cleaning failure" alarm and prompts manual cleaning using the operating tool or other troubleshooting.

As described above, by taking advantage of the characteristics of both surface cleaning and overall cleaning, we can perform a cleaning that combines both to save washing water, reduce wear on the filter media, and ensure the growth of microorganisms on the surface of the filter media. I can do it.

〔Effect of the invention〕

According to the present invention, savings in washing water can be realized.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a filtration device showing one embodiment of the present invention;
FIG. 2 is a flowchart explanatory diagram showing the operation of FIG. 1. 1...filtration tower 2...biological activated carbon 4
...Water level detector 6...Washing pump 7.
...filtration valve 8...surface layer cleaning valve 10
...Flush valve

Claims (1)

[Claims] a filtration tower that filters water to be treated using biological activated carbon; a surface cleaning device that has a cleaning valve installed approximately in the middle of the filtration tower and that cleans the surface of the biological activated carbon in the opposite direction; a total cleaning device that has a cleaning valve installed substantially at the bottom of the tower and that cleans the entire filtration tower in the reverse direction from the bottom;
a detector that responds to the pressure of the water to be treated at the top of the filtration tower and determines that the pressure loss has increased when the pressure loss of the filtration tower exceeds a set level;
A controller that compares a cycle at which the detector determines that the pressure drop has increased with a set cycle, operates the surface cleaning device if the cycle is equal to or greater than the set cycle, and operates the entire cleaning device if the cycle is shorter than the set cycle. Biological activated carbon filtration device.