Filtration And Membrane Scour Aeration; Filtration - Mitsubishi STERAPORE 5600 FF Series Instruction Manual

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Table Of Contents

Table of Contents

Chapter 2

2-1

Filtration

2-1-1 Notes Regarding Filtration Design

●

Incorporate an emergency filtration-stop function into the system.

If the air for cleaning the membrane module stops, continuing filtration results in the fixation of sludge

and a rise in trans membrane pressure. Configure a system where the air flow, pressure, etc. of the

blower are detected and an alarm is triggered/operation is stopped when necessary, as cutting the

blower belt will not be detected as the blower stopping.

●

Design the filtered water line so that siphoning does not occur when filtration is stopped.

Due to siphoning or gravity filtration, filtration may continue even when the permeate pump is

suspended during intermittent filtration operation. As membrane surface scouring (Figure 2-1) cannot

be carried out while the pump is stopped, if filtration continues the trans membrane pressure will rise

quickly. Install an automatic valve in the filtered water line or a siphon breaker behind the permeate

pump to block the flow of filtered water completely while the pump is stopped.

2-1-2 Configuring Flux Settings

Set the filtration mode to constant rate filtration.

For reference:

Flux (daily average):

During membrane cleaning (2 to 3 hours): 0.3 to 1.2 m

Trans membrane pressure rises as operation continues. It is important to monitor the fluctuations in trans

membrane pressure.

(See p.41 "6-2 Operation Management")

C AUT IO N

As the appropriate flux value differs according to the type of raw water used, water temperature,

and facility management methods, carefully consider these factors in advance.

Flux shown here is a daily average. The actual instantaneous flux during filtration is larger than

this value due to intermittent filtration as described on page 13.

STERAPORE 5600 Series (FF) Instruction Manual