Prediction of water quality in piping system of bank filtrate.

During the operation of a pilot plant from July 2010 to January 2011 for the development of bank filtration along the Nakdong River, iron and manganese were detected on average as high as 23.99 and 3.45 mg/L, respectively. These levels are dozens of times higher than those found in standard quality Korean drinking water (less than 0.3 and 0.05 mg/L for iron and manganese, respectively). If the Nakdong River were to be used as a water resource, it would not only produce color or scale in the piping system but also result in an increase in water treatment costs. Therefore, this study used by EPANET-MSX modeling to investigate the behaviors of iron and manganese in a piping system. Additionally, it assessed the possibility of color or scale formation when the bank filtrate was passed through a pipe with 38 km length and 2,600–2,800 mm diameter. The modeling result predicted that if the transport was done without reducing iron to a certain level, approximately 5300 ton/year of ferric oxide and 324 NTU of turbidity would be produced in the piping system, whereas manganese would have no effect owing to insufficient oxidants. If the iron was reduced up to 3.0 mg/L by aeration pretreatment, the ferric oxide and turbidity were predicted to be approximately 746 ton/year and 57 NTU, respectively. Furthermore, in the case of a reduction up to 0.3 mg/L by the pretreatment, the levels were predicted to be about 75 ton/year and 5.9 NTU, respectively. [ABSTRACT FROM PUBLISHER]