| Title |
Size Distribution Characteristics of Sewage Pollutants and Treatment Efficiency |
| Authors |
신응배 ; 윤현식 ; 이영대 ; 이정욱 ( Eung Bai Shin ; Hyun Sik Yoon ; Young Dae Lee ; Jung Wook Lee ) |
| Abstract |
Pollutants in wastewater are ranging from dissolved materials with molecular mass to particulate materials well over 100㎛ and it is known that wastewater treatment efficiency is influenced by the size distribution characteristics of pollutants in wastewater. In this work, such analytical techniques as membrane filter technique and gel filtration chromatography are employed to analyze size spectrum of organic pollutants in domestic wastewater. It is observed that a higher fraction of particulate matters is found in raw sewage than in treated effluent, thus exihibiting a larger mass mean diameter (Dmms,o) and the fraction tends to decrease as wastewater flows through treatment processes. It is interesting to note that the dissolved matter constitutes mainly inorganic substances as has been demonstrated by COD/Solids ratios. Three peaks are observed in a molecular mass distribution curve. The maximum is in a range of 10³∼10^5 Molecular Mass, which may contain humic acids, fulvic acids and some proteins in a broad molecular mass spectrum. This highest peak is also found in effluent as well as in influent. Other peaks are in a range of 20∼200 M. M. (synthetic organics, amino acids, nutrients such as nitrogen and phosphorus) and in a range of l.6×10³∼7×10^5 M.M. (large molecule protein, polysaccharides, nucleic acids). These two peaks are also found in treated effluent. |