Effect of Pre-ozonation on Optimized Coagulation of a Typical North-China Source Water |
| |
| Institution: | 1. Department of Environmental Engineering, College of Environmental Sciences, Peking University, Beijing, 100781, China;2. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, CAS, POB 2871, Beijing 100085, China;3. Waterborne Transportation Institute, Beijing 100088, China;1. Department of Environmental Engineering, Peking University, Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China;2. Department of Civil and Environmental Engineering, University of Washington, Seattle, WA 98195-2700, United States;3. Dipartimento di Ingegneria Idraulica ed Ambientale “Girolamo Ippolito”, Universitá degli Studi di Napoli Federico II, Via Claudio 21, 80125 Naples, Italy;4. Institut de Physique du Globe de Paris, Sorbonne Paris Cité, Université Paris-Diderot, UMR CNRS 7154, Paris, France;5. Equipe Chimie de l''Eau et Traitement des Eaux, Institut de Chimie des Milieux et Matériaux de Poitiers, UMR 7285, CNRS, Ecole Nationale Supérieure d''Ingénieurs de Poitiers, Université de Poitiers, 86022 Poitiers Cedex, France;6. Bureau des Recherches Géologiques et Minières, Environment and Process Division 3, Avenue Claude Guillemin, F-45060 Orleans Cedex 2, France;7. Forschungszentrum Karlsruhe, Institut für Nukleare Entsorgung (INE), P.O. Box 3640 76021, Karlsruhe, Germany;1. Shenzhen Key Laboratory of Environmental Chemistry and Ecological Remediation, College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, China;2. Department of Chemistry and Biochemistry, University of South Carolina, Columbia, SC 29208, United States;3. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China;1. CETaqua, Water Technology Center, Carretera d''Esplugues 75, 08940 Cornellà de Llobregat, Barcelona, Spain;2. Chemical Engineering Department, Technical University of Catalonia (UPC), Av. Diagonal 647, 08028 Barcelona, Spain;3. SGAB, Societat General d’1Aigües de Barcelona, Av. Diagonal 211, 08018 Barcelona, Spain;1. School of Environmental Science and Engineering, Sun Yat-sen University, No. 132, Waihuan Dong Road, Guangzhou, 510006, PR China;2. Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510006, PR China |
| |
| Abstract: | Although ozone is widely used as a pre-oxidant before coagulation in water treatment, the effect of pre-ozonation on optimized coagulation for removal of particle and natural organic matter (NOM) is still not fully understood. In this paper, pilot-scale investigation was conducted to examine the impact of pre-ozonation on coagulation for particle and NOM removal. Changes in the particle and NOM distributions were characterized by various methods, including laser light granularity system, particle counter, ultrafiltration, and resin absorbent fractionation. A novel composite flocculant–HPAC was compared with the traditional ferric chloride coagulant in terms of coagulation efficiency under the influence of pre-ozonation. Typical micro-polluted North China surface water was used for pilot coagulation tests. The results show that the effect of pre-ozonation on coagulation is associated with the dosage of ozone, coagulant type, and water contamination characteristics. For FeCl3, pre-ozonation acts as a coagulation aid at low dosage (1.0 mg L?1 O3) for turbidity and UV254 removal; while at higher dosage (2.0 mg L?1 O3), pre-ozonation is detrimental to UV254 removal although it is still beneficial for turbidity removal. In the case of composite flocculant–HPAC, pre-ozonation demonstrates negligible influence on both turbidity and UV254 removal. Ozone can simultaneously aggregate fine particles and break down large ones, making them more mineralized and easier to remove. NOM with intermediate molecular weight and hydrophobic neutral property increases at lower ozone dosage, favoring removal by coagulation. At higher ozone dosages, NOM becomes more hydrophilic and its molecular weight becomes smaller, decreasing NOM removal. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
