Kinetics of Wet Oxidation Reactions

2006 ◽  
Vol 9 (1) ◽  
Author(s):  
Verónica García-Molina ◽  
Jordi Barcardit ◽  
Juha Kallas ◽  
Santiago Esplugas
Keyword(s):  
Kinetic Model ◽  
Oxygen Demand ◽  
Paper Mill ◽  
Pulp And Paper ◽  
Wet Oxidation ◽  
Oxidation Reactions ◽  
Pulp And Paper Mill ◽  
Generalized Kinetic Model ◽  
Paper Mill Wastewater ◽  
Kinetics Of

AbstractIn this work the kinetics of Wet Oxidation reactions are taken under investigation. Two different types of wastewater were chosen, pulp and paper mill wastewater and model solutions containing 4-chlorophenol. Concerning Wet Oxidation of pulp and paper mill wastewater, two kinetic models were tested, the “Generalized Kinetic Model for Wet Oxidation of Organic Compounds” from Li, and the “Lumped Kinetic Model for Wastewater Organic Burden Biodegradability Prediction” proposed by Verenich and Kallas. The first model was found to be suitable to predict the COD (Chemical Oxygen Demand) removal throughout the reaction when working at the lowest temperatures i.e., 433-443 K. On the other hand, the kinetic model of Verenich and Kallas was able to predict the biodegradability of the wastewater throughout the reaction in all ranges of temperatures studied (433-473 K). Regarding the kinetics of Wet Oxidation reactions of solutions containing 4-chlorophenol, a model was suggested taking into account the existence of an induction period previous to the oxidation in which the hydroxyl radicals are generated. This model showed good performance when predicting the 4-chlorophenol (4-CP) concentration during the reaction.

scholarly journals Coagulation and UF treatment of pulp and paper mill wastewater in comparison

2012 ◽  
Vol 10 (1) ◽  
pp. 127-136 ◽  
Author(s):  
Marjana Simonič ◽  
Doroteja Vnučec
Keyword(s):  
Ceramic Membrane ◽  
Oxygen Demand ◽  
Active Surface ◽  
Paper Mill ◽  
Pilot Scale ◽  
Pulp And Paper ◽  
Pulp And Paper Mill ◽  
Polyaluminum Chloride ◽  
Paper Mills ◽  
Paper Mill Wastewater

AbstractA study using coagulation-flocculation and ultrafiltration (UF)methods for pulp and paper mills’ wastewater (WW)was carried out. The reduction efficiencies of turbidity and chemical oxygen demand (COD), the removal efficiency of total suspended solids (TSS) and absorbance at 254 nm were the main evaluating parameters. Using coagulation-flocculation, the efficiencies of alum and polyaluminum chloride (PACl)were studied, when used alone and when coupled with flocculant aids. During the coagulation-flocculation process, use of a single coagulant, the coagulant dosage, and the pH, play an important role in determining the coagulation efficiency. At the optimum PACl dosage of 840 mg L−1 and optimum pH of 9.0, turbidity reduction was found to be 94.5%. A combination of inorganic coagulant and flocculant, or polymer was applied, in which PACl was used coupled with the polyelectrolytes Organopol WPB20 and WPB40. PACl coupled with Organopol WPB20 by optimal pH 9 gave a 98.3% reduction of turbidity, 91.9% removal of TSS, and a 60.2% reduction in COD. Ultrafiltration trials were carried out on a pilot scale. A tubular module was used with ceramic membrane. This membrane is a multi-channel membrane with an active surface layer made of Al2O3 and ZrO2. Within the acidic range, the turbidity and TSS were removed at above 99%.

scholarly journals Purification of pulp and paper mill effluent through Typha and Canna using constructed wetlands technology

2011 ◽  
Vol 1 (4) ◽  
pp. 237-242 ◽  
Author(s):  
Neetu Rani ◽  
R. C. Maheshwari ◽  
Vivek Kumar ◽  
V. K. Vijay
Keyword(s):  
Wastewater Treatment ◽  
Constructed Wetlands ◽  
Constructed Wetland ◽  
Oxygen Demand ◽  
Paper Mill ◽  
Pulp And Paper ◽  
Pulp And Paper Mill ◽  
Wastewater Treatment Process ◽  
Paper Mill Effluent ◽  
Paper Mill Wastewater

The use of constructed wetlands (CW) to treat domestic as well as industrial wastewater is rapidly emerging as a viable alternative in India. Constructed wetland systems offer several potential advantages as a wastewater treatment process. These advantages include simple operation and maintenance and lower construction and operating costs. The study evaluated the effectiveness of the subsurface flow constructed wetland for pulp and paper mill wastewater treatment and also the effectiveness of plant species. A pilot scale study was conducted to examine the feasibility of a CW system for treatment of pulp and paper mill wastewater during summers as well as winters at different hydraulic retention time (HRT) such as 1.5 days, 3.5 days and 6.5 days. Wetland beds were prepared with easily available plants such as Typha angustifolia and Canna indica. Specific performance objectives were to decrease biochemical oxygen demand (BOD), chemical oxygen demand (COD), total solids (TS) and color. Comparison of mean inlet and outlet concentrations showed that the CW system could effectively reduce the output of TS (87.6 ± 1.1%), COD (86.6 ± 2.0%), BOD5 (80.01 ± 0.1%), color (89.4 ± 0.6%) during summer and TS (72.15 ± 0.71%), COD (70.94 ± 2.3%), BOD5 (72.07 ± 2.2%) and color (74.90 ± 0.47%) during winter at 3.5 days HRT.

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