title: Fractionation, characterization and C-, N-disinfection byproduct formation of soluble microbial products in MBR processes.
abstract: Soluble microbial products are heterogeneous organic materials generated during microbial growth and decay, which are the major soluble organic matters in MBR effluents and are the primary precursors forming disinfection by-products (DBPs). In this study, biomass associated products (BAP) and utilization associated products (UAP) were separately produced to investigate their physical chemical characteristics and disinfection byproduct (DBP) formation during chlorination in the presence of ammonia. BAP had higher formation reactivity of halogenated carbonaceous and nitrogenous DBPs including trihalomethanes, haloketones, haloacetonitriles and trichloronitromethane due to their higher percentage of large molecular weight (MW) materials and humic substances compared with UAP. However, the nonhalogenated species N-nitrosodimethylamine (NDMA) yield of UAP was twice higher than that of BAP because UAP contained more nitrogenous organic matters with MW<500Da including aromatic polypeptide/amino acid-like materials and secondary amines, which have been proved to have high NDMA formation potential.
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
authors.forename: Defang
authors.initials: D
authors.lastname: Ma
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
authors.forename: Yingjie
authors.initials: Y
authors.lastname: Meng
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
authors.forename: Chufan
authors.initials: C
authors.lastname: Xia
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China. Electronic address: baoyugao_sdu@aliyun.com.
authors.forename: Baoyu
authors.initials: B
authors.lastname: Gao
authors.affiliation: Shandong Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Ji'nan 250100, China.
authors.forename: Yan
authors.initials: Y
authors.lastname: Wang
mesh_terms: D000641:Ammonia / Q000737:chemistry*; D018533:Biomass; D019149:Bioreactors; D004128:Dimethylnitrosamine / Q000737:chemistry*; D004203:Disinfection; D054879:Halogenation; D006812:Humic Substances; D009584:Nitrogen / Q000737:chemistry*; D022882:Trihalomethanes / Q000737:chemistry*
chemical_list: D006812:Humic Substances; D022882:Trihalomethanes; D000641:Ammonia; D004128:Dimethylnitrosamine; D009584:Nitrogen
keywords: Biomass-associated products (BAP); Disinfection byproducts (DBPs); MBR; N-nitrosodimethylamine (NDMA); Utilization-associated products (UAP)