Four sampling campaigns were conducted in two years to understand the fluctuation of N-Nitrosamines(NAs) and their precursors in one drinking water treatment plant(DWTP) in East China in different seasons.This water s...Four sampling campaigns were conducted in two years to understand the fluctuation of N-Nitrosamines(NAs) and their precursors in one drinking water treatment plant(DWTP) in East China in different seasons.This water supply system has been facing several nitrosamine challenges related with source water, including the switch of water source,high concentration of ammonium, formed NAs and NA formation potential(FP) in source water.Besides, the use of ozonation in the DWTP and chloramination in networks will increase the NDMA concentration in tap water.To address these challenges, the biopretreatment was applied in this DWTP to decrease the concentration of ammonium and NAs.The following biological activated carbon(BAC) will neutralize the nitrosamine increase brought by ozonation.The use of free chlorine in disinfection process will also decrease the NDMA formation compared with chloramination.The results will benefit other cities in China and other countries with similar impacted water sources.展开更多
基金supported by the National Science Foundation Committee of China (No.21777079)the National Water Major Project (No.2017ZX07201002)+2 种基金the National Geographic Air and Water Conservation Fund (No.#GEFC-07-16)the Committee of Science and Technology Innovation of Shenzhen (No.JCYJ20170817161942307)the open project of State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University (No.19Y02ESPCT).
文摘Four sampling campaigns were conducted in two years to understand the fluctuation of N-Nitrosamines(NAs) and their precursors in one drinking water treatment plant(DWTP) in East China in different seasons.This water supply system has been facing several nitrosamine challenges related with source water, including the switch of water source,high concentration of ammonium, formed NAs and NA formation potential(FP) in source water.Besides, the use of ozonation in the DWTP and chloramination in networks will increase the NDMA concentration in tap water.To address these challenges, the biopretreatment was applied in this DWTP to decrease the concentration of ammonium and NAs.The following biological activated carbon(BAC) will neutralize the nitrosamine increase brought by ozonation.The use of free chlorine in disinfection process will also decrease the NDMA formation compared with chloramination.The results will benefit other cities in China and other countries with similar impacted water sources.
