JPS644407Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for measuring clogging of a filter press.

In a filter press, since the degree of clogging of the filter cloth has a great effect on the dewatering efficiency, it is desirable to operate the filter press while appropriately monitoring the degree of clogging.

Therefore, devices have been devised to measure the degree of clogging of filter cloth as air permeability, but these devices consist of a desk-like base with instruments such as a flowmeter fixed to them, and are heavy and difficult to carry. However, when making measurements, it was necessary to remove the filter cloth to be measured from the filter press and carry it to the measuring device, resulting in very poor workability. In addition, it is troublesome to reattach a filter cloth that has been removed, especially if it has been removed by cutting, etc., and it is impossible to reattach it. However, there was a problem in managing dewatering efficiency.

In order to solve the above problem, the applicant has decided to
No. 56-186779 discloses a vessel-shaped attachment whose opening is pressed into contact with a filter cloth, a flowmeter having an inlet connected to this attachment, a pressure gauge connected to the inlet of this flowmeter, and a flowmeter. We proposed a portable measuring device consisting of a suction machine with a variable suction amount connected to the outlet of the filter cloth, but this device can only measure a partial portion of the filter cloth, which forms the filtration surface of the filter press. It is not possible to detect clogging of all filter cloths, and problems remain in managing dewatering efficiency.

In view of the above points, the purpose of this invention is to accurately and smoothly measure the clogging of the entire filtration surface of a filter press and to perform efficient dehydration.

That is, in this invention, water is injected into the filter press while the injecting of sludge is stopped, and clogging of the entire filter surface is measured based on the amount of water injected and the injecting time.

Hereinafter, embodiments of this invention will be described based on the accompanying drawings.

As shown in the figure, in a filter press 3 in which sludge is pumped from the flocculation mixing tank 1 by the pump 2, a pipe line 4a from the flocculation mixing tank 1 to the pump 2 is connected to the filter press 3.
An on-off valve 5 is interposed between the on-off valve 5 and the pump 2.
A water tank 6 is connected to the pipe line 4a from the pump 2 to the filter press 3 via a flow meter 7 and an on-off valve 8.
A pressure gauge 9 is provided in the conduit 4b to enable the driving pressure to be measured.

In the figure, 10 is a stirrer for the mixing tank 1, 11 is a gate valve, 12 is a check valve, and 13 is an on-off valve such as an air-operated valve that can be operated from the outside, and the on-off valves 5 and 8 mentioned above are also similar to this. It has a similar structure.

Next, the effect will be explained.

When performing normal dehydration, open the on-off valve 5,
With the on-off valve 8 closed, the sludge is pumped from the flocculation mixing tank 1 into the filter press 3 using the pump 2 for dewatering.

When measuring the clogging of the filter cloth, the on-off valve 5 is closed, the on-off valve 8 is opened, and water is pumped into the filter press 3 from the water tank 6 by the pump 2. The charging pressure is the sludge charging pressure, for example, 4 to 7 kg/
The degree of clogging is determined by measuring the amount of pouring per unit time or the pouring time per unit amount of ^water poured. The criterion for this judgment is the total average of the above measurements.

As described above, according to the filter cloth clogging measuring device of this invention, an on-off valve is interposed in the pipe line from the coagulation mixing tank to the pump, and a water tank is connected to the pipe line from the on-off valve to the pump with a flowmeter and an open/close valve. Connected via a valve, water is pumped from the water tank into the filter press while blocking sludge from the flocculation mixing tank, and the clogging of the filter cloth is measured based on the flowmeter measurement value and the pumping time at the time of pumping. This makes it possible to accurately and smoothly measure the clogging of the entire filtration surface of the filter press, and to perform efficient dehydration.

[Brief explanation of drawings]

The drawing is a schematic diagram of an embodiment of the filter cloth clogging measuring device of this invention. DESCRIPTION OF SYMBOLS 1... Coagulation mixing tank, 2... Pump, 3... Filter press, 4a, 4b... Pipe line, 5, 8... Opening/closing valve, 6
...water tank, 7...flow meter.

Claims (1)

[Scope of utility model registration request] In a filter press in which sludge is pumped from the flocculating mixing tank using a pump, an on-off valve is interposed in the pipeline from the flocculating mixing tank to the pump, and a water tank is connected to the pipeline from the opening/closing valve to the pump with a flowmeter and a Connected via an on-off valve, water is pumped from the water tank into the filter press while blocking sludge from the flocculation mixing tank, and the clogging of the filter cloth is measured based on the flowmeter measurement value and the pumping time at the time of pumping. A device for measuring filter cloth clogging in a filter press.