Evaluation of chemical sludge production in wastewater treatment processes
| Autor: | Sidney Seckler Ferreira Filho, Roque Passos Piveli, Bruno Piotto Hespanhol, Natália Rodrigues Guimarães |
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| Rok vydání: | 2015 |
| Předmět: |
Chemistry
0208 environmental biotechnology Ocean Engineering 02 engineering and technology 010501 environmental sciences 01 natural sciences Pollution 020801 environmental engineering Mixed liquor suspended solids Industrial wastewater treatment Activated sludge Wastewater Environmental chemistry Sewage sludge treatment Sewage treatment Effluent Sludge 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Desalination and Water Treatment. 57:16346-16352 |
| ISSN: | 1944-3986 1944-3994 |
| Popis: | Sludge production in the wastewater treatment process is still a critical environmental issue today. The present study evaluates the production of chemical sludge as a result of chemical precipitation for treated wastewater from two different sources, the aerobic (conventional activated sludge) and the anaerobic (UASB reactor) treatment processes. The sludge production was estimated by implementing chemical precipitation processes using iron salts as coagulants (ferric chloride). The results indicated that the chemical sludge production increased linearly with the coagulant dosage, with sludge production values of 0.49–0.82 mg/mg FeCl3 for the aerobic effluent and 0.40–0.64 mg/mg FeCl3 for the anaerobic effluent. These values were expected according to the theoretical stoichiometry of the reactions involving the total precipitation of iron to form metal hydroxide. The increase in metal hydroxide precipitate content in the sludge reduced the volatile solids to total solids ratio up to 0.5 for dosag... |
| Databáze: | OpenAIRE |
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