ENH 424 Lecture Notes - Lecture 6: Semipermeable Membrane, Activated Carbon, Hard Water
15 Feb 2018
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Document Summary
Water treatment devices and response to adverse incidents. Intended to treat water for drinking and cooking only: examples: faucet-mounted and pitcher-style activated carbon filters. Activated carbon filters: removes certain organic substances and chlorine by adsorption onto the carbon surface, special formulations can remove lead and other metals, can be used at poe or pou, pou models = inexpensive but require replacement filters. If saturated contaminants can break through the filter: organic matter build up can lead to bacterial growth. Is most practical when it is necessary to disinfect water that serves a whole dwelling (as a poe device) Uv light: water passes through a vessel containing a uv lamp. Inactivates bacteria, protozoa, and most viruses via electromagnetic radiation: usually installed as poe devices, operates at wavelength frequency of 254 nm, lamps require replacement approximately once/year, often combined with a pre-filter. Is simple and inexpensive to install and maintain: b/c high turbidity levels (>1 ntu) lower its effectiveness.
