Treatment of the effluent of paper industry for combined process, ozone and activated silt
Full text
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| Author(s): |
Marcia Regina Assalin
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | Campinas, SP. |
| Institution: | Universidade Estadual de Campinas (UNICAMP). Instituto de Química |
| Defense date: | 2005-03-18 |
| Examining board members: |
Nelson Eduardo Duran Caballero;
Alexandre Nunes Ponezi;
Elisa Esposito;
Maria Izabel Maretti Silveira Bueno;
Pedro Luiz Onófrio Volpe
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| Advisor: | Nelson Eduardo Duran Caballero |
| Abstract | |
The efficiency of combined chemical (ozone) and biological (activated sludge) process in the treatment of Kraft E1 mill effluent was studied. The reduction of total phenols, color, total organic carbon (TOC), chemical oxygen demand (COD) and the toxicity (Selenastrum capricornutum) was evaluated. Different doses of ozone and pH of the effluent were studied. Treatment using pH 10 and concentration of 14 mg L of O3 in 60 min were the most efficient in the total phenols and color removal, but the results indicated negligible TOC reduction by application of the ozonation processes. The increase of pH as the reduction of ozone concentration influenced the kinetics properties of the process. The activated sludge process, (hydraulic retention time -HRT 12 h) was the most efficient for the TOC removal. Degradation of total phenolic compounds and decoloration were seriously affected by HRT variation. The combined process activated sludge (12 h) - ozonation (30 minutes) showed good results for the treatment of the Kraft E1 effluent (COD 75 %; TOC 73 %, Decoloration 80,7 % and Total Phenols 66,9 %). (AU) | |