The purpose of the study was to investigate the performance of displacement ventilation in a large factory hall where large components of stainless steel for paper, pulp and chemical industries were manufactured. The performance of displacement ventilation was evaluated in terms of concentration distributions of welding fumes and grinding particles, flow field of the supply air and temperature ...

EXTENDED ABSTRACT The removal of chromium from water and wastewater has caused increased research interest in recent years. Chromium exists in the environment mainly in one of two valence states: a) trivalent Cr(III), and b) hexavalent Cr(VI) form. Cr(VI) enters the environment primarily through industrial processes including the production of steel and metal alloys, chrome plating, dyes and pi...

Aqueous plant leaves extract (PLE) of an abundant shrub, Sorbaria sorbifolia, was explored for the reduction of hexavalent chromium, Cr(VI), to trivalent chromium, Cr(III). The effect of contact time, pH, PLE quantity, ionic strength, hardness, temperature and effective initial Cr(VI) ion concentration were tested; Cr(VI) reduction followed the pseudo-first order rate kinetics and maximum reduc...

Trivalent chromium, recently identified as the active ingredient of the glucose tolerance factor, appears to be a dietary agent required for maintenance of normal glucose tolerance in the rat. The element, applied in the form of certain coordination complexes, prevents impairment of removal rates of intravenously injected glucose in rats on rations deficient in glucose tolerance factor, and it ...

Protonated or Ca-form Sargassum seaweed biomass bound up to 40 mg/g of Cr(III) by ion exchange at pH 4. An ion-exchange model assuming that the only species taken up by the biomass was Cr(OH)2+ successfully fitted the experimental biosorption data for Cr(III). The maximum uptake of Cr(VI) by protonated Sargassum biomass at pH 2 was explained by simultaneous anion exchange and Cr(VI) to Cr(III) ...

The process of assessing the public health risk of exposure to particular environmental contaminants is complicated and full of assumptions and uncertainties (1,2). However, the problems of assessing risks for chromium exposure are unusually complex (3,4). The problems posed by current investigations of chromiumcontaminated soil in northern New Jersey (5), in part, provided the impetus for a co...