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- Title
Comparison of Fe–Mn enhanced coagulation and O 3 -BAC for removing natural organic matter from source waters: a case study.
- Authors
Liu, Feng; Bai, Yaohui; Liu, Ruiping; Qu, Jiuhui; Tian, Chuan; Chen, Hu; Wang, Bin
- Abstract
This plant-scale investigation compared two process improvement strategies for Lianyungang drinking water treatment plant (L-DWTP), a typical plant employing conventional processes to treat source water impacted by seasonal non-point pollution. Hierarchical cluster analysis grouped it into two clusters, i.e. normal period and polluted period. Originally, the L-DWTP exhibited poor organic matter removal efficiency, and 76.7% of the effluent permanganate index (CODMn) levels exceeded the state regulation requirement (<3 mg/L). In addition, chloroform concentration was observed to exceed the regulation requirement (60 μg/L) by 14.2 and 56.2% in normal and polluted periods. The combined use of FeCl3and KMnO4(Fe–Mn enhanced coagulation) increased the CODMnremoval efficiency by 10.6%, and decreased the chloroform formation by 26.4%. It indicates that about 94.5% of effluent CODMnvalues and nearly all of chloroform levels may meet the standard in normal period. However, Fe–Mn enhanced coagulation shows limitation in polluted period. The advanced treatment by ozone-biological activated carbon process (O3-BAC) increases the CODMnremoval efficiency by 29.5%, and decreases the chloroform formation by 43%, indicating that effluent levels may meet the standard both in normal and polluted periods. Cost was also compared, and the extra cost for Fe–Mn enhanced coagulation is only about 20% of that for O3-BAC. In conclusion, O3-BAC works well both in normal and polluted periods. Fe–Mn enhanced coagulation only shows good performance in normal period, but is more economical. Therefore, it is proposed to use Fe–Mn enhanced coagulation in normal period, while O3-BAC during polluted period. These obtained plant-scale data are valuable to optimize the operation of DWTPs with similar challenges.
- Subjects
UPGRADING of water treatment plants; COAGULATION; ORGANIC compounds; WATER pollution; OZONE; CHLOROFORM; HIERARCHICAL clustering (Cluster analysis); PERMANGANATES
- Publication
Desalination & Water Treatment, 2016, Vol 57, Issue 20, p9101
- ISSN
1944-3994
- Publication type
Article
- DOI
10.1080/19443994.2015.1030702