Filtration System

We provide wide range of filtration system. The entire ranges of filter are available in different material of construction like FRP, MS, MSRL and SS etc. Operation of filters can be manually or fully automatic type.

The purpose of filtration is to remove suspended particles from water by passing the water through a medium such as sand. As the water passes through the filter, flocs and impurities get stuck in the sand and the clean water goes through. The filtered water collects in the clear well, where it is disinfected and then used as process water or sent to the other downstream process for the industrial purpose.

Filtration is usually the final step in the solids removal process which begins with coagulation and advanced through flocculation and sedimentation. In the filter, up to 99.5% of the suspended solids in the water can be removed, including flocs and microorganisms.

Activated Carbon Filter:

The working principle of Activated Carbon Filter is same like Multi Grade Filter. In this type of filter, filtering media is Activated Carbon Granules. Carbon filtering is a method of filtering that uses a bed of activated carbon to remove contaminants and impurities, using chemical adsorption .The activated carbon present in the standard range has an iodine value of 450. This carbon is also available in iodine values of 600, 900 and 1200.

Activated carbon is useful in drinking water treatment because it acts as an adsorbent, and can effectively remove particles and organics from water. These organics are of great concern in water treatment because they react with many disinfectants. Adsorption is the process by which Activated Carbon removes substances from water.

Adsorption is the collection of a substance onto the surface of adsorbent solids. It is a removal process where certain particles are bound to an adsorbent particle surface by either chemical or physical attraction. Adsorption is often confused with Absorption, where the substance being collected or removed actually penetrates into the other solid.

Active charcoal carbon filters are most effective at removing chlorine, sediment, volatile organic compounds (VOCs), taste and odor from water. They are not effective at removing minerals, salts, and dissolved inorganic compounds.

Multi Grade Filter

The Multi Grade Filter consists of multiple layers of sands with a difference in size and specific gravity of sands. These layers of sands are responsible for the filtration process.

Raw water flows down wards through the sand media. The suspended and colloidal maters present in the pretreated water are retained on the sand surface and between sand gaps. Backwash operation is provided in order to remove the suspended particles from the sand surface so that it will clear the filter bed and improve the water quality.

Multi Grade Filter is a depth filter that makes use of coarse and fine media mixed together in a fixed proportion. This arrangement produces a filter bed with adequate pore dimensions for retaining both large and small suspended particles. This filter performs at a substantially higher specific flow rate than conventional filters. Specific flow rates of 0.82 – 1.64 ft/min have been successfully obtained for treating waters containing 25 – 50 ppm suspended solids respectively to produce filtrate with less than 5 ppm.

Iron Removal Filter

The process through which iron is removed from water is known as Oxidation Filtration that involves the oxidation of the soluble forms of iron (Fe) and manganese (Mn) to their soluble forms and then removal by filtration.

In this type of filter, filtering media is manganese dioxide and sand of various grades is used. This filter also consists of multiple layers of sands with a difference in size and specific gravity of sands.

Manganese dioxide catalysis precipitation of iron and holds back the precipitated matter on the filter bed. Also manganese dioxide acts as a strong oxidizing agent.

Dual Media Filter

Dual media filters have high dirt removal capacity of as the finest sand forms.

This comprises of sand and anthracite as filtering media and polishing media respectively. Internally it is fitted with inlet distributor and a bottom collecting system. Externally, it is fitted with frontal pipe work and isolation valves. Sand is used for removing the suspended particles and anthracite removes the odor and color etc. to make the water suitable for various applications. Pebbles and gravels are provided to support both the media. This filter is to be backwashed after accumulation of suspended solids; however, before carrying out the backwash, air scouring is also to be done for loosening of dirt and suspended solids. Limit for the backwash in these filers is governed by differential pressure across the filter.