Entity

Time filter

Source Type


Wang Y.,South China University of Technology | Wang Y.,United Laboratory of Resource Chemistry and Chemical Engineering | Wang Y.,University of New Brunswick | Chen K.,South China University of Technology | And 6 more authors.
Chemistry Letters | Year: 2014

Sulfur-containing species, such as sulfite, are detrimental to the operation of anaerobic systems, therefore, it is critical to determine their concentrations in order to optimize an anaerobic reactor. In this study, the traditional titration method for the determination of sulfite was applied to acid-condensate samples from an acid sulfite pulp mill effluent, and the results showed that they were consistently lower than those from ion chromatography (IC). It was found that the presence of furfural in the acid-condensate samples can interfere with the titration for sulfite, resulting in lower sulfite values; the higher the furfural concentration in the sample, the lower the indicated sulfite concentration by titration. It was concluded that IC method is a reliable method for determining the sulfite concentration for samples containing furfural. © 2014 The Chemical Society of Japan. Source


Wang Y.,South China University of Technology | Wang Y.,United Laboratory of Resource Chemistry and Chemical Engineering | Chen K.,South China University of Technology | Chen K.,United Laboratory of Resource Chemistry and Chemical Engineering | And 4 more authors.
Journal of Applied Polymer Science | Year: 2013

A study using coagulation-flocculation method for the treatment of papermaking-reconstituted tobacco slice wastewater had been carried out. Polyaluminum chloride (PAC) and polyferric sulfate (PFS) as coagulants, and four kinds of polyacrylamides (PAMs) as flocculants, were employed during the coagulation-flocculation process. The effects of three factors, that is, the dosage of coagulants, the dosage of flocculants and pH on the treatment efficiency of the process were evaluated. The results showed that the efficiencies of PAC and PFS on the reduction of COD, ammonia nitrogen (NH 3-N) and total suspended solids (TSS) in the treated effluents were equivalent; however, the efficiency of PAC on the color reduction was much higher than that of PFS. In the presence of PAC, a cationic polyacrylamide with very high molecular weight and low charge density (i.e., PAM4) was found to give the highest coagulation-flocculation efficiency. At the optimal conditions, that is, pH of 6.5, PAC dosage of 500 mg/L, and PAM4 dosage of 5 mg/L, the reductions of COD, NH3-N, color, and TSS in the process were found to be 70.8, 84.8, 72.3, and 98.5%, respectively. The study also showed that the PAC-PAM4 scheme can remove the most of aluminum from the raw water. © 2013 Wiley Periodicals, Inc. Source


Wang Y.,South China University of Technology | Wang Y.,United Laboratory of Resource Chemistry and Chemical Engineering | Chen K.,South China University of Technology | Chen K.,United Laboratory of Resource Chemistry and Chemical Engineering | And 6 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2014

A coagulation-flocculation process was used to treat papermaking-reconstituted tobacco slice wastewater with polyaluminium chloride (PAC) as coagulant and a cationic polyacrylamide (CPAM) as flocculant. To maximize the reduction of chemical oxygen demand (COD) and color, the jar tests were carried out in the experiments and response surface methodology (RSM) was applied to optimize the process. A central composite design, i.e., a standard approach in RSM, was used to evaluate the effects and interactions of three factors, i.e. PAC dosage, CPAM dosage and pH on the treatment efficiency. Results revealed that the maximum reduction of COD and color could be achieved at an optimal conditions, i.e., PAC. = 715. mg/L, CPAM. = 4.8. mg/L and pH. = 6.6, from which the reduction of COD and color were 67.8% and 77.7%, respectively. The study also showed that the regression equations could be used as the theoretical basis for coagulation-flocculation process of papermaking-reconstituted tobacco slice wastewater. They will be very helpful to flexibly select the appropriate process parameters in the engineering applications. © 2013 . Source

Discover hidden collaborations