Evaluation of N-Nitrosamines Removal Capability by Using Simulated Advanced Drinking Water Treatment Process for the Downstream of Nakdong River

Kim, Gyung-Ah; Son, Hee-Jong; Seo, Chang-Dong; Yeom, Hoon-Sik; Song, Mi-Jeong; Ryu, Dong-Woo

doi:10.4491/ksee.2019.41.1.1

Cited by 6 publications

(2 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…18) 질소계 소독부산물의 비교적 높은 건강 위해성과 상대적으로 낮은 검출농도로 인하여 최근에는 간편한 전처리로 분석 감도 를 증진시키기 위한 연구들 19,20,21) 을 비롯하여 정수처리 공정 에서의 이들의 거동과 제거능을 평가하는 여러 연구들이 진 행되고 있다. 22,23) 질소계 소독부산물로는 할로아세토니트릴류 (haloacetonitriles, HANs), 할로니트로메탄류(halonitromethanes, HNMs), 니트로사민류(nitrosamine)를 비롯하여 할로아세트아 마이드류(haloacetamide, HAcAms) 등이 비교적 잘 알려져 있다. 최근에는 질소계 소독부산물 중에서 HAcAms에 대한 연구 들이 중점적으로 수행되고 있는 추세이며, HAcAms는 2000~ 2002년 미국 N-DBP 조사에서 음용수에서는 처음 확인되었 다.…”

Section: 유정문ㆍ설현주ㆍ손희종unclassified

Haloacetamides Formation and Fate in Drinking Water Treatment Process of the Lower Nakdong River: Comparison of Summer and Winter Seasons

Ryu¹,

Seol²,

Son³

2022

J Korean Soc Environ Eng

View full text Add to dashboard Cite

Objectives : The formation characteristics and fate of haloacetamides (HAcAms), nitrogenous disinfection by-products (DBPs), were evaluated for each process in a drinking water treatment plant (DWTP) located downstream of the Nakdong River in summer and winter. In preparation for the gradually strengthening rules for DBPs, it was intended to be used as basic data for operating DWTPs.Methods : Seven HAcAms were monitored from the raw water to the clean water in the summer (Jul.∼Aug.) and winter (Dec.∼Jan.) at a large DWTP (180,000 m3/day) located downstream of the Nakdong River. Liquid-liquid extraction (LLE) method was used for sample extraction and GC-MS/MS was used for HAcAms analysis.Results and Discussion : The concentrations of HAcAms formed by the pre-Cl2 treatment in the DWTP in summer and winter were 9.4~27.2 µg/L and 1.4~3.5 µg/L, respectively, and were 7.7 times higher in summer than in winter. The HAcAms/TOX concentration ratio was 0.09~0.14 in summer compared to 0.01~0.02 in winter, and the HAcAms composition ratio among DBPs formed by the pre-chlorination increased rapidly in the summer. Five species of DCAcAm, BCAcAm, TCAcAm, DBAcAm, and BDCAcAm were formed in summer by the pre-chlorination, and five species of DCAcAm, BCAcAm, DBAcAm, DBCAcAm, and TBAcAm were formed in winter. The composition ratio of di-HAcAm species accounted for 91% and 66% in summer and winter, respectively, and the DCAcAm concentration was highest compared to other HAcAms species. In the batch biodegradation experiment, it was evaluated that the biodegradation of the HAcAms species was easy, and in the laboratory scale BAC process experiment (water temp. 20℃, EBCT 10~30 min.), di- and tri-HAcAms removal rate were 75~99% and 85~100%, respectively. In summer and winter, the removal rates of HAcAms in the BAC process of the DWTP were 81% and 54% on average, respectively. The HAcAm detection concentrations in the clean water ranged from 1.7 to 2.4 μg/L in summer and 0.7 to 1.2 µg/L in winter, which was twice as high in summer as was compared to winter.Conclusion : The formation concentration of HAcAms was higher than in winter by pre-chlorination, but it was easily removed in the BAC process in summer. However, in winter, the formation concentration of HAcAms was low by pre-chlorine treatment, but the removal rate in the BAC process was as low as 54%. The main removal process and mechanism of HAcAms in the DWTP were the BAC process and biodegradation. In a lab-scale BAC process simulation, a removal rate of more tthan 95% removal efficiency could be expected with the increase of EBCT to 30 minutes when HAcAms was highly formed in summer.

show abstract

Section: 유정문ㆍ설현주ㆍ손희종unclassified

Haloacetamides Formation and Fate in Drinking Water Treatment Process of the Lower Nakdong River: Comparison of Summer and Winter Seasons

Ryu¹,

Seol²,

Son³

2022

J Korean Soc Environ Eng

View full text Add to dashboard Cite

show abstract

“…13) 여러 연구결과들에서는 BAC 공정이 소독부산물, 이취 유발 물질, 조류 독소물질, 개인 위생용품 첨가제, 잔류 의약물질 등을 효과적으로 제거하지만, 수온 저하와 접촉시간 감소가 이들의 제거율에 큰 영향을 미치는 것으로 보고하고 있다. [14][15][16][17][18][19][20][21] 최근, BAC 공정의 효율 향상을 목적으로 BAC 공정 강화 (enhancement)에 관한 연구가 활발히 진행되고 있다. 22,23) 강화 BAC 공정은 적정 농도의 무기성 영양물질(인(P), 질소(N))과 과산화수소를 유입수에 첨가하여 BAC 생물막의 생체량 및 활 성도 증진을 유도하여 생물분해 효율을 향상시킨다.…”

unclassified

Enhancement of Biological Activated Carbon (BAC) Process to Improve Removal Efficiency of Micropollutants

Son,

Jung,

Yoom

et al. 2023

J Korean Soc Environ Eng

View full text Add to dashboard Cite

Objectives : In this study, the removal efficiency of micropollutants in the biological activated carbon (BAC) process was investigated, and a method for improving the removal efficiency of micropollutants in the BAC process of water treatment plants was proposed.Methods : Dibromo-methylparaben (Br2-MP) was selected as the target micropollutant. Batch and lab-scale column experiments were conducted to evaluate the removal efficiencies of Br2-MP in the conventional BAC process and the BAC with enhanced biofilm properties by the addition of phosphorus (P) and hydrogen peroxide (H2O2). Biodegradation kinetics were evaluated using results from batch and lab scale column experiments.Results and Discussion : As a result of comparing the removal efficiency of Br2-MP in a batch experiment with the same biomass concentrations (2.0±0.2×107 cells), the biodegradation rate constant (kbio) of the enhanced BAC process was found to be 1.2 times higher than that of the conventional BAC process due to its higher biological activity (enhanced BAC: 3.4±0.3 mg·C/g·hr, conventional BAC: 2.9±0.4 mg·C/g·hr). Comparison of removal efficiencies of Br2-MP in batch experiments with the same wet weight of BAC (1 g) showed that the biodegradation rate constant (kbio) of the enhanced BAC process was 1.9 times higher than that of conventional BAC process due to higher biomass (enhanced BAC: 3.5±0.4 µg·ATP/g·GAC, conventional BAC: 2.3±0.2 µg·ATP/g·GAC). Through the batch experiments, the enhanced BAC process was efficient in removing Br2-MP via increasing both biomass concentrations and activity of attached microorganisms. Lab-scale column experiments conducted under different water temperatures (5 and 25℃) and empty bed contact time (EBCT: 5-40 min) conditions showed higher removal efficiency of Br2-MP in the enhanced BAC process than the conventional BAC process throughout the entire period of operation. In particular, the removal efficiency of Br2-MP between the enhanced and conventional BAC processes showed significant differences at low temperature (5℃) and short EBCT (5 min). At 5℃ and 25℃, the kbio of the conventional BAC process was 0.0229 min-1 and 0.0612 min-1, respectively, and the kbio of the enhanced BAC process was 0.0470 min-1 and 0.1421 min-1, respectively, These results showed that the enhanced BAC process had two times higher biodegradability of Br2-MP than the conventional BAC process. These results showed a similar trend to the results from the batch experiment. In an experiments simulating the impact of frequent EBCT changes during summer, the enhanced BAC process maintained a relatively stable removal efficiency of Br2-MP compared to the conventional BAC process.Conclusion : The enhanced BAC process showed superior biodegradation of micropollutant compared to the conventional BAC process. Considering economic costs (e.g., costs of adding phosphate and hydrogen peroxide) and water quality, it appears to be an efficient alternative to operate the enhanced BAC process intermittently, limited to cases where EBCT is shortened, such as summer, or when water temperature is low, such as in winter.

show abstract

Removal of N-Nitrosodiphenylamine from contaminated water: A novel modeling framework using metaheuristic-based ensemble models

Alam,

Akinpelu,

Nazal

et al. 2024

Journal of Environmental Management

View full text Add to dashboard Cite

Evaluation of N-Nitrosamines Removal Capability by Using Simulated Advanced Drinking Water Treatment Process for the Downstream of Nakdong River

Cited by 6 publications

References 36 publications

Haloacetamides Formation and Fate in Drinking Water Treatment Process of the Lower Nakdong River: Comparison of Summer and Winter Seasons

Haloacetamides Formation and Fate in Drinking Water Treatment Process of the Lower Nakdong River: Comparison of Summer and Winter Seasons

Enhancement of Biological Activated Carbon (BAC) Process to Improve Removal Efficiency of Micropollutants

Removal of N-Nitrosodiphenylamine from contaminated water: A novel modeling framework using metaheuristic-based ensemble models

Contact Info

Product

Resources

About