Catalytic ozonation of dimethyl phthalate (DMP) in aqueous solution (5 mg/L) under various reactions was performed to examine the effect of catalyst dosage, catalyst particle size, ozone dosage, and gas flow rate on t...
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Catalytic ozonation of dimethyl phthalate (DMP) in aqueous solution (5 mg/L) under various reactions was performed to examine the effect of catalyst dosage, catalyst particle size, ozone dosage, and gas flow rate on the mineralization of DMR The mineralization of DMP can be achieved via ozonation and the presence of Ru/AC could greatly accelerate the mineralization rate of DIVIP in ozonation process. In the continuous experiment of the Ru/AC catalyzed ozonation of DMP, total organic carbon (TOC) removals were kept stable around 75% during 42 h reaction. No leaching of ruthenium was observed in the treated water samples. The treatment of natural water using Ru/AC + O(3), Ru/AC + O(2) and ozonation alone was studied. In the Ru/AC + O(3) process, TOC removals, the reductions of the haloacetic acid formation potentials (HAAFPs), and the reductions of the trihalomethane formation potentials (THMFPs) of 11 water samples were 22-44%,39-61% and 50-65%, respectively. Ru/AC + O(3) process was much more effective than ozonation alone for TOC removal and the reduction of disinfection by-product formation potential (DBPFP) in the treatment of natural water. It is a promising water treatment technology. (C) 2008 Elsevier B.V. All rights reserved.
The chromium distribution and transportation in the anaerobic activated sludge was investigated using a sequential extraction method. The results showed that Cr(VI) in aqueous solution was reduced by the metabolic pro...
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The chromium distribution and transportation in the anaerobic activated sludge was investigated using a sequential extraction method. The results showed that Cr(VI) in aqueous solution was reduced by the metabolic product of SRB and form indissoluble Cr(OH)(3) in a solid phase. More than 99% of Cr(III) in the sludge was in a stable residual form (RES) of bio-reduction. The Cr(VI) was mainly present in RES and organic form (OR). With increasing Cr(VI) concentration, Cr(VI) was transferred from RES into OR and even exchangeable form (EXCH). Meanwhile, sulphate and co-existing metal ions affected the occurrence form of Cr(VI).
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