Title: Absorbing water pollutants with corn cobs
Subject: Environmental Sciences
Subcategory: Water Filtration
Grade level: Middle School - Grades 7-9
Academic Level: Ordinary
Project Type: Building / Engineering
Cost: Low
Awards: Google Science Fair Finalist
Affiliation: Google Science Fair
Year: 2015
Materials: Corn cobs, domestic effluent
Description: Experiment 1: A hole at the centre of a corn cob without piercing the other end of the cob was done. Then, 50 ml of domestic effluent collected from kitchen drain pipe was allowed to pass slowly through the central hole of the cob and the filtrate was collected. The filtrate was subjected to several qualitative and chemical tests like the presence and absence of oxides of salts, detergents, oils, colored dyes, suspended particles etc .
Experiment 2: An artificial tank was designed in a plastic tub with the capacity of 20 l having pond water and soil as bottom floor. Corn cobs were tied on bamboo sticks which in turn were buried in the floor of the pond, so that the cobs were immersed. The set up was allowed to stand for two weeks to study the rate of adsorption by corncobs.
Link: www.googlesciencefair.com...
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