Removal of ammoniacal nitrogen and suspended solids in sewage wastewater by using ferrous sulfate in coagulation process via zeta potential and particles size
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Date
2018-06
Authors
Fatin Farhana Kamarzaman
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Abstract
A comprehensive sewage characterization was conducted to further understand the
nature of sewage generated in domestic and commercial areas. It was revealed that the
characteristic sewage in domestic areas resembled the typical sewage characteristic
reported globally. In the first phase of this study, to characterize the initial wastewater
characteristics for each sample and wastewater quality, laboratory work were carried
out included ammoniacal nitrogen (NH3-N), biochemical oxygen demand (BOD),
chemical oxygen demand (COD), total suspended solid (TSS) and e.coli. Next in the
second phase of this study, to analysis and measurements of the average zeta potential
and particles size as a function of pH were carried out separately for the sewage
wastewater and the selected coagulant which is the selected of coagulant was ferrous
sulfate hydrated, FeSO4.7H2O. Based on the results, the optimum pH range was
predetermined which is pH 2 and pH 8. This is subsequently followed through by
observing the aggregation and disaggregation behaviour of the size particles in the
sewage wastewater due to the interaction with the coagulant as the function of the
coagulant concentration. Finally, a jar test was conducted to validate the preliminary
findings by evaluating selected pollutant removal in percentage values (%). It was
reported that for pH 2, percentage of pollutant removal for BOD5, COD and TSS were
86.0%, 88.9% and 73.5% respectively which higher compared to pH 8 that obtained of
59.3%, 92.1% and 66.7% respectively. However, for concentration of NH3 –N and
e.coli at pH 2 were obtained of 33.9% and 66.1% respectively while pH 8 is about
21.9% and 64.1% respectively. Hence, the objective to calculate the percentage of
pollutant removal based on the predetermined optimum pH which is pH 2 and pH8 and
coagulant dosage range has been achieved.