AWWA MTC93048

Ozone enhances ultrafiltration for treated water (clarified and settled water) but reduces fluxes for raw surface water for low ozone dose. The critical zone for raw water is from 1 to 3 mg/l ozone introduced. As ozone reacts rapidly with organic matter especially with insaturated compounds (50% reduction for only 1.5 mg O3/l introduced), the membrane permeability is improved from 10 to 20% compared to ultrafiltration treatment alone. In raw water, ozone does not only react with soluble organic matter but also with particulate matter. Indeed a microflocculation phenomena for the critical ozone doses appears and participate to the membrane fouling. This microflocculation phenomena is the consequence of a surface charge neutralization, an increase in size of the particle, a polymerization of organic matters and a precipitation of oxidation byproducts with bivalent compounds.

Product Details

Published:

01/01/1993

ISBN(s):

0898677076

Number of Pages:

20

File Size:

1 file , 890 KB