Evaluation of Water Treatment Residue as a Sorption Medium and its Application to Control Phosphate Level in Water


Abstract- Wastewater treatment residual material, WTR, from a local drinkingwater facility in Baghdad, was evaluated as a potential medium for the removal ofsome unwanted species from water. The material was first characterized bychemical composition, X-ray diffraction and infrared spectral analysis prior to itsuse as an adsorbent. The x-ray revealed that the material is a calcium based watertreatment residue mixed with silica and impurities of oxides like MgO and Fe2O3.The adsorption characteristics of the material were evaluated by studying theadsorption of methylene blue. The cation exchange capacity and the surface areahad values of 10.5 mmol per100 g and 87.5 m2.g-1, respectively. The sorptioncapacity of the material was applied to control the phosphate concentration inwater. Time and adsorbent amount have played significant roles in the removal ofphosphate from water. An adsorption capacity had a value of 1.6 mg PO43-.g-1 ofWTR