The effect of the amount of adsorbent on the removal of Cu
ions by rice husk is depicted in Table 5 for varied adsorbent
doses of 20, 30, 40, 50 and 60 mg/l. Cu removal using rice husk
increased from 24.49% to 98.177% i.e. with the increase of the
amount of absorbent concentration , while Cu removal using
fly Ash varied from 37.38% to 98.545% (see Table 6).