Abstract
There is a need for developing low cost, easily and abundantly available, yet efficient, adsorbents for the removal of phosphates during the tertiary treatment of wastewater. The wasted sludge from a cuttlefish processing factory prepared on a laboratory scale has been used to evaluate its performance for phosphate adsorption. The material has been shown to be a good alternative adsorbent. As much as 90% phosphate removal by the prepared sludge is possible in about 20 h under the test conditions. Phosphate removal is seen to increase with decreasing adsorbent particle size, increasing the relative concentration of phosphate to sludge and increasing adsorbent dose. Models for predicting phosphate removal incorporate operational variables such as the ratio of phosphate to wasted material and adsorbent dose. These models also manifest high values of the correlation coefficients. Calcium phosphate precipitation in the present experimental system is not a significant phosphate removal mechanism.
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