Comparison of the formation of N-nitrosodimethylamine (NDMA) from algae organic matter by chlor(am)ination and UV irradiation

被引：15

作者：

Liu, Decai ^{[1
]}

Rao, La ^{[1
]}

Shi, Xiaoyang ^{[1
]}

Du, Jiayu ^{[1
]}

Chen, Chen ^{[1
]}

Sun, Wenjie ^{[2
,3
]}

Fu, Ming-Lai ^{[1
]}

Yuan, Baoling ^{[1
,2
]}

机构：

[1] Huaqiao Univ, Coll Civil Engn, Xiamen Key Lab Municipal & Ind Solid Waste Utiliza, Xiamen 361021, Fujian, Peoples R China

[2] Jilin Jianzhu Univ, Key Lab Songliao Aquat Environm, Minist Educ, Changchun 130118, Peoples R China

[3] St Cloud State Univ, Dept Atmospher & Hydrol Sci, 720 4th Ave South, St Cloud, MN 56301 USA

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2022年 / 838卷

基金：

中国国家自然科学基金;

关键词：

Extracellular organic matter; Intracellular organic matter; Chlorination; Chloramination; UV irradiation; N-nitrosodimethylamine (NDMA); DISINFECTION BY-PRODUCTS; MOLECULAR-WEIGHT FRACTIONS; DRINKING-WATER; MICROCYSTIS-AERUGINOSA; NITROSAMINE PRECURSORS; CHLORAMINE SPECIATION; REVERSE-OSMOSIS; CHLORINATION; REMOVAL; DBPS;

D O I：

10.1016/j.scitotenv.2022.156078

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Microcystis aeruginosa (M. aeruginosa, blue-green algae) blooms frequently in drinking water reservoirs and subsequently causes the formation of disinfection by-products (DBPs) after disinfection, which may pose a potential health risk. In this study, the formation of N-nitrosodimethylamine (NDMA) was evaluated from algal organic matter (AOM) including extracellular organic matter (EOM) and intracellular organic matter (IOM) during the disinfection process of chlorination, chloramination, or ultraviolet (UV) irradiation. The effects of a variety of factors, including reaction times, disinfectant dosages and pH, on the NDMA formation by three different disinfection methods were investigated. Additionally, this study evaluated the nitrogen sources involved in NDMA formation during chloramination of EOM and IOM using N-15-labeled monochloramine. The results showed that the NDMA formation by three different disinfection methods were ranked in the order of chlorination > UV irradiation asymptotic to chloramination and the specific yield from EOM was greater than that from IOM regardless of disinfection method. The yields of NDMA firstly increased and then plateaued as time prolonged during the chlorination and chloramination of AOM. Similarly, the NDMA formation from EOM was firstly increased and then remained constant with the increase of the disinfectant dosage, while it was gradually increased for IOM. The solution pH highly influenced the NDMA formation during chlorination and chloramination, while exhibited a little impact under UV irradiation. Moreover, fluorescence excitation-emission (EEM) analysis confirmed that soluble microbial by-product-like (SMPs) in EOM and IOM were the major precursors in algal-derived organic matter that contributed to the NDMA formation. Chloramination of EOM and IOM using isotope N-15-labeled monochloramine indicated that the nitroso group of the formed NDMA originates mainly from EOM and IOM of algal cells.

引用

页数：8

共 61 条

[1]

Amp O.O, 2015, DETERMINATION NITROS

[2] Lower molecular weight fractions of PolyDADMAC coagulants disproportionately contribute to N-nitrosodimethylamine formation during water treatment [J].