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Author Jarpa, M.; Rozas, O.; Salazar, C.; Baeza, C.; Campos, J.L.; Mansilla, H.D.; Vidal, G. pdf  doi
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  Title Comparison of the chemical precipitation, UV/H2O2 and Fenton processes to optimize removal of chronic toxicity from kraft mill effluents Type
  Year 2016 Publication Desalination And Water Treatment Abbreviated Journal Desalin. Water Treat.  
  Volume 57 Issue 30 Pages 13887-13896  
  Keywords AOPs; COD; Chemical precipitation; Chronic toxicity; Kraft mill effluents  
  Abstract Secondary Treatment Effluents (STE) from Kraft mill effluents are discharged into aquatic ecosystems with high color and chronic toxicity contents owing to the recalcitrance of compounds in the effluents. The goal of the study was to evaluate the chemical precipitation, UV/H2O2, and the Fenton processes (H2O2/Fe2+) for chemical oxygen demand (COD) and for removing chronic toxicity from STE. A circumscribed central composite model and a response surface methodology were used to evaluate the effects of variables such as Al-2(SO4)(3), Fe(II), and H2O2 concentration and pH range for each treatment. The optimal conditions were 984.2mg Al-2(SO4)(3)/L and pH 5.2 for chemical precipitation; 51.4mM H2O2 and pH 5.1 for UV/H2O2; and 5.5mM Fe(II): 25mM H2O2 concentration and pH 2.8 for H2O2/Fe2+. Under such optimal conditions, COD removal was 84.7, 80.0, and 93.6%, with reaction times of 57, 75, and 10min for the chemical precipitation, UV/H2O2, and H2O2/Fe2+ methods, respectively. This study recorded chronic toxicity in STE and sludge formed during chemical precipitation with maximum reductions in percentages of Allometric Growth Rate (AGR) of 11.5 for STE without dilution (100%, p<0.05). For chemical precipitation sludge, the maximum reduction of AGR was 3.4% for a dilution of 75%. We concluded that all the assessed treatments effectively removed chronic toxicity in the treated effluents.  
  Address [Jarpa, Mayra; Rozas, Oscar; Baeza, Carolina; Vidal, Gladys] Univ Concepcion, Fac Environm Sci, POB 160-C, Concepcion, Chile, Email: mayjarpa@gmail.com;  
  Corporate Author Thesis  
  Publisher Taylor & Francis Inc Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 1944-3994 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000371702300005 Approved  
  Call Number UAI @ eduardo.moreno @ Serial 602  
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