LIYing-qiang,MAQing-guang,LIUZe-hua,et al.Concentration Level and Removal of Fifteen Free Amino Acids in Eight Drinking Water Treatment Plants in South China[J].China Water & Wastewater,2022,38(13):28-35.
Concentration Level and Removal of Fifteen Free Amino Acids in Eight Drinking Water Treatment Plants in South China
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第13期
Page:
28-35
Column:
Date of publication:
2022-07-01
- Keywords:
- drinking water treatment plant; free amino acid; concentration level; removal characteristic; chlorination
- Abstract:
- Amino acids (AAs) are important nitrogenous organics in water, which are also important precursors of many nitrogenous disinfection byproducts that cause odor problem in drinking water. This work investigated the occurrence and removal of 15 AAs in eight drinking water treatment plants (DWTPs) in South China based on LC-MS/MS. The data showed that G and H DWTPs had the highest total concentrations with respective concentrations of 222.9 nmol/L and 219.2 nmol/L, while the A DWTP had the lowest concentration of 107.6 nmol/L. H and D DWTPs shared the highest removal efficiencies for total free AAs, which were 61.8% and 56.7%, respectively. C DWTP had the lowest removal efficiency of 30.4%. The total average removal efficiencies of aspartic acid and valine in the eight DWTPs were 74.3% and 60.6%, which were the top two among 15 AAs. On the other hand, the corresponding removal of tryptophan was only 22.6%, which had the lowest removal. During the post chlorination process, aspartic acid, tyrosine and L-isoleucine had the highest removal efficiencies with respective removals of 21.9%, 17.2% and 15.0%, while phenylalanine, glutamic acid and valine had the lowest removals of 5.4%, 7.1% and 7.2%. Aspartic acid was the most reactive AA in chlorine disinfection. The average removal efficiency of the total fifteen free AAs by conventional disinfection process was about 46.5%.
Last Update:
2022-07-01