The adsorption studies were carried out in transparent glass column that had 5.0 cm internal diameter and 50 cm in height. The adsorbents (Corn cobs) were confined in the column by fine Teflon (PTFE) filter (No.1) at the bottom and a glass beds layer packing at the top of the adsorbents to ensure a uniform distribution of influent through the adsorbent. The influent waste water was introduced to the column through a rubber stopper, fixed at the top of the column and controlled it by a valve at the lower end of the column. Two containers were used as wastewater containers, the first one is plastic container was used as waste water feed container (5 Liters) at the top of the column. Second one is a glass container (Beaker) was used as a waste water reservoir container (2 Liters) at the bottom of a column. A column was washed with de-ionized water before adsorption experiments. Column filled with prepared Corn cobs samples for industrial waste water samples. In order to determine and estimate the efficiency of adsorbent for treatment of industrial waste water. Efficiency of adsorbent was determined according to certain parameters such as: pH value and Contact time.
b- Factors Affecting Heavy metals removal and other pollutants
The adsorption tests were carried out for the examination of possible effects of different levels of pH and contact time. For pH, the range of 5-8 and contact time from 0.25 – 5 hrs. were used.