Decomposition of humic acid and reduction of trihalomethane formation potential in water by ozone with u.v. irradiation

Ozonolysis Of Humic Acid And Its Effect On Decoloration And Biodegradability

“…The relationship between the fragmentation and decoloration, however, has not been sufficiently discussed with respect to the change in molecular 51 1 weight distribution. In addition to the fragmentation, carbonyl compounds and low molecular weight organic acids have been identified as the reaction products (Liao et al, 1982;Sayato and Nakamuro, 1989;Kusakabe et al;1990). In spite of many papers concerning the reaction products, the structure of humic substances still remains unclear, and the reactivity with ozone has not been completely understood.…”

A Nonlinear Model of Contaminant Transformations in an Aquatic Environment

“…Note that this approach based on equation (9) features the same accuracy as the approach in [18] based on linear kinetics with partially decomposing organic matter. A discrepancy between these approaches can appear only if the time is long (in our case, more than 5 h).…”

“…If we take equation (5) as a basis, the correlation of (14) and (5) results in the relationship κ = kc ν -1 . Substituting (9) in this equation with allowance made for the definitions of values (10) yields (18) At t ӷ T, we obtain (19) From the comparison of (17) and (19), it follows that ε = 0.14.…”

“…At t ӷ T, the dependence (20) changes to (16). At a = 1, we obtain the time dependence of the type of (18).…”

“…The decomposition of humic acids under the combined effect of ozone and ultraviolet radiation was studied in [18]. In this experiment, a humic acid solution circulated through a barbotage column and an UV-reactor.…”