We offer iron removal process description: stage I - chemical dosingto level the ph factor, chemical pre treatment is done in order to facilitate rapid aeration than the chemical dosed water send in to the aeration tanks stage ii- online aeration typechemical dosed water is sent into the aeration tank consisting three chambers. The raw water is allowed to sprinkle at the first chamber through specially designed perforated pipes. The water travels from first chamber to other two chambers through accurately designed multiple vents at variable levels of the bifurcate walls, thus provides zig zag motion. When the water reaches the third chambers the dissolved iron gets oxides and become suspended iron. 8 hours storage aeration typechemical dosed water is pumped in to aeration tank. The raw water is allowed to sprinkle (at the tanksump) via designed perforated pipes and allowed to remain there for about 8 to 10 hrs to get oxidized through the natural process and the iron presence in the water becomes suspended iron. Stage iii - filtrationthe suspended iron water is passed through iron removal unit, the filter media is supported on gravel bed that consists of multiple layers of progressively larger sizes of manganese di oxide, activated carbon 900iv, graded quartz sand, fine sand, super fine white sand and pebbles, which retain the suspended iron particles. During the filtration cycle the filter bed retains the dirt and suspended particles from the water and accumulates within the filter bed. Backwash:as the filtration progress the filter media gets loaded with the retained particles, this results in a continuous increase of pressure drop across the filter, when a predetermined pressure drop level is achieved the filter is shut down for cleaning. After backwashing the filter is rinsed with raw water and after the quality of water is achieved the filter is put back into service.
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Beltola, Guwahati, Assam 