No abstract

No abstract

No abstract

No abstract

No abstract

Several compositions of Fenton's Reagent and hydrogen peroxide alone were used to disinfect combined sewage samples from a wastewater treatment facility. The presettled samples contained suspended solids (SS) and dissolved organic carbon (DOC) at concentrations of 28 and 290 mg/L, respectively. Disinfection with Fenton's Reagent was carried out at a pH between 5.90 and 6.0 and at a temperature of 25 • C. All disinfected samples contained residual oxidants. Under all reaction conditions studied, complete inactivation of E. coli was achieved within one minute of the addition of Fenton's Reagent. Disinfection with hydrogen peroxide alone under similar conditions is incomplete even under much longer contact times. O

Textural evidence, thermobarometry, and geochronology were used to constrain the pressuretemperature-time (P-T-t) history of the southern portion of the Britt domain in the Central Gneiss Belt, Ontario Grenville Province. Typical metapelitic assemblages are quartz + plagioclase+ biotite + garnet + kyanite ± alkali feldspar ± sillimanite ± rutile ± ilmenite ± staurolite ± gahnite ± muscovite. Metatonalitic assemblages have quartz + plagioclase + garnet + biotite + hornblende + rutile + ilmenite. Metagabbroic rocks contain plagioclase + garnet + clinopyroxene + biotite + ilmenite ± hornblende ± rutile± quartz. Notable textural features include overgrowths of sillimanite on kyanite and of spinel on staurolite. The spinel overgrowths can be modeled by the breakdown of staurolite via the reaction Fe-staurolite = hercynite +kyanite + quartz+ H 2 O. The decomposition of staurolite to hercynite has a steep dP/dT slope and constrains the late prograde path of a staurolite metapelite. Garnet-Al 2 SiOj-plagioclase-quartz (GASP) barometry applied to metapelitic garnets that preserve calcium zoning reveals a pressure decrease from ~ 11 to 6 kb at an assumed temperature of 700 °C. Garnet-plagioclase-ilmenite-rutile-quartz and garnet-clinopyroxene-plagioclase-quartz barometry is in good agreement with pressures obtained with the GASP barometer. Geochronologic data from garnet, allanite, and monazite in metapelitic rocks give ages that fall into two groups, ~ 1-4 Ga and 1 • 1 Ga, suggesting the presence of at least two metamorphic events in the area. It is most reasonable to assign the 1-4 Ga age to the high-pressure data and the 1-1 Ga age to the lower-pressure data. Collectively the P-T-t data indicate a complex and protracted history rather than a single cycle of burial and uplift for this part of the Grenville Province.

No abstract