민기 손아섬 조강우 홍석원 2024-01-19T12:33:31Z 2024-01-19T12:33:31Z 2022-04-14 2022-02 1225-7672 https://pubs.kist.re.kr/handle/201004/115645 N-nitrosodimethylamine (NDMA) is a potent carcinogen that frequently detects nitrosamine from water chloramination. This study investigated the occurrence of NDMA and its potential precursor, ranitidine (RNT), in four wastewater treatment plants (WWTPs). Additionally, the effects of chloramination methods and oxidative pretreatment on the NDMA formation potential (FP) were assessed. Concentration levels of NDMA in the WWTPs waters ranged from 2.5 (detection limit) to 72.6 ng/L, while RNT values ranged from 1.32 to 186.9 ng/L. Further study indicated that the NDMA-FPs from chloraminated wastewaters varied between 36.2 and 227.8 ng/L. Nonetheless, chloramination methods and oxidative pretreatment significantly impacted the NDMA-FP levels. For example, breakpoint chlorination and stepwise chloramination promoted NDMA-FP when compared to preformed chloramination, which could be attributed to the formation of dichloramine and chlorine species. In contrast, prechlorination was found to effectively mitigate NDMA-FP, based on integrated ultraviolet (UV) irradiation. Notably, UV irradiation with free chlorine (UV/Cl2) or permanganate (UV/MnO4 -) reduced NDMA-FP by up to 70%. This study suggests that UV/MnO4 - and UV/Cl2 may be used as alternative mitigation strategies for reducing nitrosamine-FP in the water treatment process. English 대한상하수도학회 하수 중 N-nitrosodimethylamine 분포 및 라니티딘에 의한 이의 형성: 클로라민 처리 방법과 산화 전처리 영향 Presence of N-nitrosodimethylamine and its formation from ranitidine in domestic wastewater: The role of chloramination methods and oxidative pretreatment Article 10.11001/jksww.2022.36.1.23 2 상하수도학회지, v.36, no.1, pp.23 - 32 상하수도학회지 36 1 23 32 N kci ART002810959 파과점 염소 처리 클로라민 처리 NDMA 형성 과망간산염 전염소 처리 Break point chlorination Chloramination NDMA formation Permanganate Prechlorination