TOWARDS THE DEVELOPMENT OF A NOVEL WASTEWATER TREATMENT SYSTEM INCORPORATING DRINKING WATER RESIDUAL: PRELIMINARY RESULTS
Akintunde Babatunde 1, Yongzhe Yang2 and Yaqian Zhao3
1, 2, 3.School of Architecture, Landscape and Civil Engineering,
University College Dublin, Ireland.
(free)
Towards establishing a prima facie for the possible reuse of dewatered drinking water residual (DWR) in a novel wastewater treatment system, batch-equilibration studies were carried out to identify phosphorus adsorption behaviour and capacity of a dewatered DWR. In the adsorption tests, the same kinetic trend was observed in all cases, irrespective of the dosage of the dewatered DWR or phosphorus speciation. A maximum adsorption capacity of 3.5 and 3.2 mg-P/g of dewatered DWR was obtained for orthophosphate and polyphosphate respectively at pH 4.3. However, adsorption capacity varied according to phosphorus speciation and solution pH, indicating that within a wide pH range, adsorption capacity is dependent on solution pH and the phosphorus specie in solution. Correspondingly, when solution pH was increased form 4.3 to 6, adsorption capacity for polyphosphate decreased by 50% while the decrease for orthophosphate was less than 10%, highlighting the profound effect of solution pH on polyphosphate adsorption. Adsorption capacity was however least in the basic region in both cases.
KEYWORDS Adsorption capacity, Constructed wetland, Drinking water residual, Phosphorus, wastewater treatment.
