title: Optimization of Fenton process for decoloration and COD removal in tobacco wastewater and toxicological evaluation of the effluent.
abstract: Decoloration and chemical oxygen demand (COD) removal in tobacco wastewater by Fenton process has been optimized under 25 +/- 2 degrees C. The results showed that the optimal range of conditions were pH 4.13-4.66, Fe(2+) 0.29-0.34 g/L and H2O2 > or = 2.73 g/L. Within this range, up to 95% of colour and 90% of COD was removed. In an enlarged system, setting the optimal conditions as pH 4.50, Fe(2+) 0.34 g/L and H2O2 4.00 g/L, the colour removal rate was 96.03 +/- 2.57%, with COD removal rate of 93.30 +/- 2.92%. The residual COD of 73.67 +/- 19.70 mg/L in effluent had hit the State's first-class standard for the industrial discharge in China (< 100 mg/L COD, GB8978-1996). The ecological safety of Fenton process has also been evaluated. When reaction completed, the content of hydroxyl free radical (OH) was 3.26 +/- 0.44 mg/L. There was no inhibition of Fenton effluent in growth of Escherichia coli, Pseudomonas putida, Pseudomonas sp. HF-1, Acinetobacter sp. TW and Sphingomonas sp. TY. No oxidative stress was induced on strain HF-1 by Fenton effluent. Thus, Fenton process was one of high-efficiency and ecologically safe strategy for tobacco wastewater advanced treatment.
authors: College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China.
authors: Meizhen
authors: M
authors: Wang
authors: Guiqin
authors: G
authors: Yang
authors: Huajun
authors: H
authors: Feng
authors: Zhenmei
authors: Z
authors: Lv
authors: Hang
authors: H
authors: Min
mesh_terms: D002681:China; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007220:Industrial Waste / Q000032:analysis*; D007501:Iron / Q000737:chemistry*; D008956:Models, Chemical; D010100:Oxygen / Q000378:metabolism; D014026:Nicotiana / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000633:toxicity*; D018508:Water Purification
chemical_list: C045076:Fenton's reagent; D007220:Industrial Waste; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; D007501:Iron; D010100:Oxygen