Natural Organic Matter (Nom) Removal
Recent researches in Norway concerning coagulation-contact filtration for the removal of natural organic matter (NOM) include filter media based on Expanded Clay Aggregates (ECA®) filters and Chitosan as a biodegradable and natural coagulant. - The main benefits associated with Chitosan as a coagulant are:
- Reduced solids production compared with other conventional coagulants
- Treatment and disposal of biodegradable, natural sludge, which does not contain metal hydroxides from metal-based coagulants.
- Expanded Clay Aggregate (ECA®) can be produced with an inverse relationship between density and grain size, giving it an approximation to the perfect situation of decreasing grain size in the direction of flow.
- Traditionally, this significant property of a filter bed is utilized in up-flow filters, or in dual or multimedia down-flow filters with combinations of two or more filter media.
- This research showed the pilot-scale treatment of Natural Organic Matter (NOM)-containing waters using Expanded Clay Aggregate (ECA®) as a filter media and Chitosan for coagulation.
- Expanded Clay Aggregate (ECA®) is considered as the best filter media to use due to its inert (natural) nature, biological regeneration (It can be used over and over again) and lastly it is biodegradable.
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