Occurrence and removal of earthy-musty odorants in two waterworks in Kinmen Island, Taiwan

Wen Hsing Hsieh, De Wei Chang, Tsair-Fuh Lin

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

In this study, the occurrence and treatment of two earthy-musty odorants, geosmin and 2-MIB, produced by cyanobacteria is investigated at two conventional drinking-water treatment plants (WTPs) at Kinmen Island, Taiwan. Samples of the source, processed, and finished waters and tap water at the two WTPs were collected and analyzed. Both geosmin and 2-MIB were commonly detected in most water samples, with the 2-MIB concentration much higher than the geosmin concentration. About 78% of the source water samples and 35% of the finished and tap water samples showed detected 2-MIB levels higher than the odor threshold concentration (OTC, ~10 ng/L). Sampling and analysis of the reservoir water indicated that 2-MIB is uniformly distributed in the reservoir, with ~70% of which existing in the dissolved phase. The chlorination study of the raw water indicates that both geosmin and 2-MIB are resistant to chlorine. However, the cyanobacterial cells in raw water were effectively ruptured within15 min of the contact time when a chlorine dosage of 6.4 mg/L was applied at the WTPs. A monitoring of the processed water at WTPs shows that the flotation process is most effective to the removal of cyanobacteria, with about 77-79% efficiency, compared to ~99.4% achieved with the whole treatment train. Removal of 2-MIB by the treatment processes before flotation was only about 17-28%, which may be limited to the low ratio of cell-bound 2-MIB. The two sand filtration processes removed 23-47% of 2-MIB, due probably to the biological degradation of dissolved 2-MIB. For the two WTP studied, the removal of 2-MIB was about 74%. It is shown that 2-MIB is a major odorant in the drinking water source and the finished water at Kinmen Island. The current processes are not sufficient to remove 2-MIB to a level below the OTC. Advanced processes are needed to effectively remove the odorant.

原文English
文章編號04014012
期刊Journal of Hazardous, Toxic, and Radioactive Waste
18
發行號3
DOIs
出版狀態Published - 2015 7月 1

All Science Journal Classification (ASJC) codes

  • 環境工程
  • 環境化學
  • 化學工程 (全部)
  • 水科學與技術
  • 岩土工程與工程地質
  • 廢物管理和處置

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