Micro-Filtration System

Description

A Multi-Media Filtration Silicon Sand Filter is used to reduce the level of suspended solids (turbidity) in process water treatment. Suspended solids can consist of small particles such as silt, clay, grit, organic matter, larvae, zooplankton, algae and other microorganisms. The filtration degree of a multi-media filter depends heavily on the filter media and flow (velocity) through the filter. A typical multimedia filter setup contains three layers of filling. Those are anthracite, sand and gravel.

• The anthracite traps the courser dirt particles to prevent the formation of a layer cake on top of the filter bed.
• The smaller particles get trapped in the sand layer. With a low fluid velocity particle will adhere to the sand with a cohesive bonding.
• The gravel allows the water to flow evenly to the mushroom diffusors and out of the filter media.

This filter package allows the entire filter bed to function longer between backwashes. A well operated filter removes particles down to 15-20 microns. With use of a coagulant addition, it can filter particles down to 5-10 microns.

Over time the pressure drops over the filter rises while the flow remains the same, due to the adhered suspended solids. Eventually the filter media needs to be cleaned, a process called backwashing.

The Specification of 40m3/Hour Silicon Sand Filter

• Speed: V=10m/H
• Height of filter layer: about 1600mm
• Backwash capacity: it’s better be 50T/H
• Backwash inflow rate : 10L/S. m2
• Backwash inlet pressure: about 0.4MPa
• Working pressure: 0.2MPa—0.6MPa
• Water Intet pressure: less than 2.5MPa, less higher than 2.5MPa, then need backwashing
• Dia of inlet /Outlet: 90mm
• Temperature: 1—49 ℃