Pii: S0043-1354(01)00021-5
نویسنده
چکیده
Hydrogen peroxide was produced by direct current electrolysis using two electrodes only, a carbon felt cathode and a dimensional stabilised anode (titanium coated with RuO2), without adding any chemical. The required oxygen was supplied by water oxidation and by transfer from the atmosphere. The intensity should be maintained under a maximum value to avoid peroxide reduction. High peroxide production rate and concentration were then reached. Electroperoxidation partially removed dissolved organic carbon (DOC) contained in solutions of phenol, salicylic acid, benzoic acid and humic acids. The DOC removal in effluent of municipal sewage plant corresponded to a breakage of the double bonds. Real effluents were significantly disinfected owing to the direct effect of electric current and the indirect effect of peroxide. Moreover, a remnant effect was ensured. # 2001 Elsevier Science Ltd. All rights reserved Key words}disinfection, electrochemical treatment, electrolysis, hydrogen peroxide, oxidation
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Pii: S0043-1354(01)00061-6
It is well known that the permeability and density of an aggregate decreases with its size, affecting its settling velocity and coagulation rate (rate of particle capture) with other particles. This change in aggregate density with size can be described by fractal scaling relationships. Two distinctly different fractal scaling approaches, however, have been used to describe aggregate permeabili...
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متن کاملPii: S0043-1354(01)00060-4
The Goshen Swamp, a fourth order blackwater creek in southeastern North Carolina, was clearcut of 130 acres of riparian and seasonally flooded forest in late May through September 1998. Downstream water quality had been monitored monthly for 212 years before the clearcut, during the clearcut, and for two years following the clearcut. The objective of this paper was to test the hypothesis that c...
متن کاملPii: S0043-1354(00)00513-3
Breaking down the time limit constraints for conventional compression–permeation (C–P) cell test, this work has, for the first time, experimentally evaluated the cake characteristics of viable wasteactivated sludge subject to polyelectrolyte flocculation and to freeze/thaw treatment under a pressure range of 25–200 kPa. There exists a threshold pressure exceeding which the cake structure would ...
متن کاملPii: S0043-1354(01)00121-x
Constructed wetlands could be components of low-tech systems to treat and reuse wastewater in arid region. A key function of the wetland would be to provide additional N removal. To improve design criteria, a sequential model of nitrogen transformations (organic N! ammonium; ammonium!nitrate; nitrate!nitrogen gas) was successfully calibrated and verified for a wetland in Kingman, Arizona. A seq...
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