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- Title
Effect of Copper(II) on Natural Organic Matter Removal During Drinking Water Coagulation Using Aluminum-Based Coagulants.
- Authors
Guojing Liu; Xiangru Zhang; Talley, Jeffrey W.
- Abstract
Coagulation has been proposed as a best available technology for controlling natural organic matter (NOM) during drinking water treatment. The presence of heavy metals such as copper(II) in source water, which may form copper-NOM complexes and/or interact with a coagulant, may pose a potential challenge on the coagulation of NOM. in this work, the effect of copper(H) on NOM removal by coagulation using alum or PAX-18 (a commercial polymerized aluminum chloride from Kemiron Inc., Barrow, Florida) was examined. The results show that the presence of I to 10 mg/L of copper(II) in the simulated waters improved the total organic carbon (TOC) removal by up to 25% for alum coagulation and by up to 22% for PAX-18 coagulation. The increased NOM removal with the presence of copper(II) in the waters can most likely be ascribed to the formation copper-NOM complexes that may be more adsorbable on aluminum precipitates and to the formation of copper(H) co-precipitates that may also adsorb NOM. The presence of 1 to 5 mg/L of copper(H) in the waters containing 3 mg/L NOM as carbon was reduced below the maximum contaminant level goal (1.3 mg/L as copper) using either coagulant. The results suggest that the presence of copper(lI) in source water may not adversely affect the NOM removal by coagulation. A good linear correlation was observed between the TOC removal efficiency and the log-total moles of the precipitated metals, which include the metal ion from a coagulant and the divalent metal ion(s) in source water.
- Subjects
COPPER content of drinking water; ORGANIC compounds removal (Water purification); COAGULATION in water purification; ALUMINUM; COAGULATION
- Publication
Water Environment Research (10614303), 2007, Vol 79, Issue 6, p593
- ISSN
1061-4303
- Publication type
Article
- DOI
10.2175/106143006X136829