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This study was performed to further reveal the reaction mechanism and kinetic characters of UV-Fenton process for the degradation of formaldehyde (HCHO) in a batch photochemical reactor. The concentration changes of hydrogen peroxide, ferrous ions, and the intermediate products were analyzed. Through comparing the rate constants (k) of H2O2 consumption and the variation of Fe2+ concentration in the...
Sample preparation is essential for isolating desired components from complex matrices and greatly influences their reliable and accurate analysis. Stir-bar-sorptive extraction (SBSE) is a new and effective sample preparation technique.A rapid method for analysis of Ultra-trace nonylphenol in the aquatic environment was developed by stir bar sorptive extraction. The extraction recoveries of nonylphenol...
Method for simultaneous analyzing the residual of PAEs & PAHs in municipal wastewater by solid phase extraction coupled with gas chromatography was established. The proposed methods were used for the analysis of 16 PAHs & 6 PAEs of the municipal wastewater in Xi'an. NAPT, ACNY, ACEN, FLUR, PHEN, DMP, ANTH, PYR, DEP, DEHP, DBP, and BBP were quite frequently observed in influent. The analytes...
Biodegradation of Reactive Red 2(RR2) by anaerobic process UASB was investigated under thermophilic condition such as 55 plusmn 1degC. The quasi-steady state of the UASB reactor was achieved after 92 running days when the conditions were as follows: hydraulic retention time (HRT) 12 h, salinity 50000 mg/L, COD 1000 mg/L, RR2 100 mg /L. The removal efficiencies of COD and RR2 were about 20% and 92%,...
A new process of enhanced dissolved air floatation (DAF) by pulsed high voltage discharge was studied in this paper. With high voltage discharges, removal rate of some normal water quality indexes were better improved, such as UV254 and CODMn from 0.145 to 0.142 and from 6.2 mg/L to 5.8 mg/L. The turbidity of water after treated with pulsed high voltage discharges was larger than that without discharges...
The chemical coagulation and ozonation process was used as a advanced treatment to treat the effluent of waste water from a alcohol industry. Used chemical oxygen demand(COD) as the parameter for decision-making. Previously, chemical coagulation experiments were conducted for the optimal coagulation dosages determination, for the coagulants ferric chloride(FC),PAC,PFS, aluminum sulfate(AS) and ferrous...
In order to better utilize and recover the productive wastewater from the Eucalyptus oil and hence decrease its pollution to water environment, we used GC/MS to analyze the possible top value-added components of benzene/ethanol extractives of leaves of two Eucalyptus cultivars, i.e. E. camaldulensis and E. citriodora . Relative content of each component was determined by area normalization. 22 compounds...
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