title: Generation of soluble microbial products by bio-activated carbon filter during drinking water advanced treatment and its influence on spectral characteristics.
abstract: In order to improve our understanding of bio-activated carbon (BAC) filter, the water quality of influent and effluent treated with BAC in a drinking water treatment plant (DWTP) of Shanghai during 2015 was valued. Combining the results from UV254, SUVA254, dissolved organic carbon (DOC) and scanning electron microscopic (SEM), it is found that performance of BAC treatment will be affected by characteristics of activated carbon (AC), which is relevant to the type of activated carbon (including shape and operating time) in this study. Fluorescence excitation-emission matrix (FEEM) shows that the humification index (HIX) and index of recent autochthonous contribution (BIX) is a reliable indicator to descript the variation of dissolved organic matter (DOM) during BAC process. The pattern of variation in BIX and HIX implies that soluble microbial products (SMPs) are formed and humic-like substances are removed during BAC treatment, which is also confirmed by the change of peaks of FEEM in BAC effluent. Large, positive correlations between SUVA254 and disinfection by-products formation potential yield (DBPFP yield) demonstrate that UV-absorbing DOM is directly related to the generation of DBPs. Poor correlations of HIX with DBPFP suggest that non-humic substances with UV-absorbing properties play an important role in the generation of DBPs in water with low SUVA254. Finally, strong but negative correlations between BIX and DBPFP suggest that vigorous microbial metabolism of BAC results in a decrease in DBPFP. However, the DBPFP yield will be enhanced for the generation of SMPs by BAC, especially in summer.
authors.affiliation: National Engineering Research Center for Urban Pollution Control, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China. Electronic address: song.wei0326@163.com.
authors.forename: Hong
authors.initials: H
authors.lastname: Shen
authors.affiliation: National Engineering Research Center for Urban Pollution Control, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China. Electronic address: 742702437@qq.com.
authors.forename: Xin
authors.initials: X
authors.lastname: Chen
authors.affiliation: National Engineering Research Center of Urban Water Resources, Shanghai National Engineering Research Center of Urban Water Resources Co. Ltd, Shanghai 200082, PR China. Electronic address: zhdongtj7021@sina.com.
authors.forename: Dong
authors.initials: D
authors.lastname: Zhang
authors.affiliation: National Engineering Research Center for Urban Pollution Control, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China. Electronic address: hbctxc@tongji.edu.cn.
authors.forename: Hong-Bin
authors.initials: HB
authors.lastname: Chen
mesh_terms: D002606:Charcoal / Q000737:chemistry*; D002681:China; D002947:Cities; D004202:Disinfectants / Q000032:analysis*; D060766:Drinking Water / Q000737:chemistry*; D005453:Fluorescence; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification; D060753:Water Quality
chemical_list: D004202:Disinfectants; D060766:Drinking Water; D014874:Water Pollutants, Chemical; D002606:Charcoal
keywords: Bio-activated carbon (BAC) filter; Disinfection by-products formation potential (DBPFP) yield; Drinking water; Fluorescence excitation–emission matrix (FEEM); Fluorescence index; Soluble microbial products (SMPs)