Filtration

Filtration

All kinds of natural water, contain impurities in the form of suspended solids in different quantities, according to the site conditions.  Nature and quantity of these impurities make the water unusable for drinking or for industrial applications.

Water treatment system often used gravity rapid rate sand filters. Pressure type sand filter plus coagulants are used for commercial application.

For manufacturing pressure sand filter, Either single or dual grade sand is filled up in a pressurized vessel. Internally it is fitted with inlet distributor and a bottom collecting system. Externally, it is fitted with frontal pipe work and isolation valves. Pebbles and gravels are provided as the bottom layer under the sand bed of uniform size to support the sand bed. This filter removes mainly suspended impurities from the water source. Suspended impurities get trapped within the sand media when water having suspended impurities is passed through the sand bed and clear water comes out as the product. Backwash of the filter is to be carried out to remove these entrapped impurities from the filter, once it reaches to its maximum limits. This limit is governed by differential pressure across the filter.

Auto Valve less Gravity Filter which uses sand as filtering media and works on the principal of gravity filtration without any valve, pilot mechanisms, rate controllers, gauges and air compressors. This is having two compartments, filtering section and wash water storage compartment. During normal operation water gets filtered while traveling across the sand bed. During filtration suspended solids gets accumulated in the filter bed and differential pressure start increasing which causes the water level to rise in the backwash pipe. When the water level reaches the top of the loop, siphon action start and backwash begins. Wash water flows from the storage compartment through the sand bed and is discharged through the back wash pipe. A siphon breaker ends the wash cycle.

The major application of these filter are for raw water clarification, site stream filtration of cooling tower etc i.e. mainly for low turbidity applications.

All of the design, project management, production, manufacturing, installation and commissioning services are made by our engineers and technicians.