MadSci Network: Engineering

Re: Can water ionize and filter air?

Date: Mon Jan 29 16:10:31 2007
Posted By: Uncle Al Schwartz, Organic synthetic chemist
Area of science: Engineering
ID: 1167982784.Eg

Water scrubbing is a standard industrial process for removing both
particulates and chemicals from air.  A countercurrent tower has water
(spray or sheets) cascading downward and dirty air blown upward.  Scrubbing
takes place at the contact surface area.  Small drops mean large exchange
areas/volume of water.

Electrostatic precipitation is another standard industrial process.  High
voltage on a surface carpeted with sharp projections produces very large
local electric fields with very large field gradients.  Ions are launched
into the air and accumulate on particulates.  An oppositely charged plate
downstream then attracts and holds the dirt.

Home versions of either are of variable effectiveness.  The advertising is
often much more optimistic than the engineering.  Electrostatic devices may
discharge ozone, and that is a bad thing.

Uncle Al
 (Toxic URL! Unsafe for children and most mammals)

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