Fate of extracellular polymeric substances of anaerobically digested sewage sludge during pre-dewatering conditioning with Acidithiobacillus ferrooxidans culture
| Autor: | Ammaiyappan Selvam, Shuk Man Yu, Balasubramani Ravindran, Mayur B. Kurade, Kumarasamy Murugesan, Jonathan W C Wong |
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| Rok vydání: | 2015 |
| Předmět: |
Environmental Engineering
Polymers Acidithiobacillus 0208 environmental biotechnology Bioengineering 02 engineering and technology 010501 environmental sciences Significant negative correlation 01 natural sciences Conditioning process Microbiology Water Purification Extracellular polymeric substance Bioreactors Food science Waste Management and Disposal 0105 earth and related environmental sciences Sewage Renewable Energy Sustainability and the Environment Chemistry Substrate (chemistry) General Medicine Hydrogen-Ion Concentration Dewatering 020801 environmental engineering Acidithiobacillus ferrooxidans Conditioning Sludge Filtration |
| Zdroj: | Bioresource technology. 217 |
| ISSN: | 1873-2976 |
| Popis: | This study investigated the fate of extracellular polymeric substances (EPS) of anaerobically digested saline sewage sludge during its preconditioning. Sludge was conditioned with Acidithiobacillus ferrooxidans (AF) culture for 24h in the presence and absence of Fe(2+) as an energy substrate. pH decreased from 7.24 to 3.12 during sludge conditioning process. The capillary suction time (CST) of conditioned sludge significantly decreased to10s, and specific resistance to filtration (SRF) was reduced by94% as compared with control within 4h of conditioning with or without Fe(2+), indicating a significant (P0.001) improvement in sludge dewaterability. A noticeable decrease in extractable EPS was observed in conditioned sludge. The EPS contents showed a significant negative correlation with dewaterability of sludge (P0.05). The results suggest that bioacidification treatment using A. ferrooxidans effectively improved sludge dewaterability through modification of sludge EPS. |
| Databáze: | OpenAIRE |
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