NOM removal from drinking water by chitosan coagulation and filtration through lightweight expanded clay aggregate filters
| Autor: | Bjørnar Eikebrokk, Torgeir Saltnes |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Environmental Engineering
Materials science Filter media Alum Health Toxicology and Mutagenesis Environmental engineering Pulp and paper industry Grain size Filter (aquarium) law.invention Chitosan chemistry.chemical_compound chemistry law Coagulation (water treatment) Expanded clay aggregate Filtration Water Science and Technology |
| Zdroj: | Journal of Water Supply: Research and Technology-Aqua. 51:323-332 |
| ISSN: | 1605-3974 0003-7214 |
| Popis: | Recent innovations in Norway regarding coagulation-contact filtration for the removal of natural organic matter (NOM) include chitosan as a natural and biodegradable coagulant, and filter media based on lightweight expanded clay aggregates (Filtralite). The main advantages associated with chitosan are: reduced solids production compared with conventional coagulants; and treatment and disposal of natural, biodegradable sludge, which does not contain metal hydroxides from metal-based coagulants. Filtralite can be produced with an inverse relationship between grain size and density, thus allowing an approximation to the ideal situation of decreasing grain size in the direction of flow. Traditionally, this important property of a filter bed is utilised in up-flow filters, or in dual or multimedia down-flow filters with combinations of two or more filter media. This paper presents experimental results from pilot-scale treatment of NOM-containing raw waters using chitosan for coagulation and expanded clay aggregates as filter media. A dual media anthracite-sand filter and alum coagulant was used as a reference for comparison with conventional process configurations. |
| Databáze: | OpenAIRE |
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