The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. 79725-98-7, Name is (4-Oxo-5-(palmitoyloxy)-4H-pyran-2-yl)methyl palmitate, SMILES is O1C(=CC(=O)C(=C1)C(=O)OCCCCCCCCCCCCCCC)COC(=O)CCCCCCCCCCCCCCC, in an article , author is Zhang, Xiaolu, once mentioned of 79725-98-7, SDS of cas: 79725-98-7.
Source characterization and removal ofN-nitrosamine precursors during activated sludge treatment
Municipal wastewater discharges are a major potential source ofN-nitrosamine precursors which may impact downstream source water quality. To elucidate the sources ofN-nitrosamine precursors and their fate during biological wastewater treatment (i.e., the activated sludge (AS) process), the formation potentials (FPs) of sevenN-nitrosamine species were monitored in blackwater (i.e., human urine and feces), greywater (i.e., from kitchen food and detergent, laundry, and showering), and the influent from four wastewater treatment plants (WWTPs) during batch AS treatment.N-Nitrosodimethylamine (NDMA),N-nitrosopyrrolidine (NPYR) andN-nitrosopiperidine (NPIP) precursors originate mainly from biological waste materials (e.g., human urine, sweat in laundry greywater or shower greywater, food leachates), while detergents and personal care products (e.g., shampoo and body wash in shower greywater) could be the main sources ofN-nitrosodiethylamine (NDEA),N-nitrosodi-n-butylamine (NDBA), andN-nitrosodi-n-propylamine (NDPA) precursors. AS from two domestic WWTPs (one urban and one rural) exhibited better removal of NDMA precursors from biological waste materials, while the textile AS more effectively removed mostN-nitrosamine precursors from detergents or personal care products. The type of WWTP influent negligibly (i.e., <8% differences) affected the removal of NDMA precursors. Rather, AS sources and seasonal changes in AS activities may have an impact. Increasing the incubation time from 6 to 24 h enhanced the removal ofN-nitrosamine precursors, especially for precursors from detergents and personal care products. These results suggest that there is no single source containing various precursors ofN-nitrosamines. The AS types, sampling seasons and hydraulic retention time (or incubation time) may all impact the removal efficiencies forN-nitrosamine precursors. Interested yet? Read on for other articles about 79725-98-7, you can contact me at any time and look forward to more communication. SDS of cas: 79725-98-7.
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