Optimizing the synergistic effect of sodium hydroxide/ultrasound pre-treatment of sludge
| Autor: | Wun Jern Ng, Antoine P. Trzcinski, Xinbo Tian |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
inorganic chemicals
Pre treatment Acoustics and Ultrasonics Sonication 02 engineering and technology 010501 environmental sciences 01 natural sciences Inorganic Chemistry chemistry.chemical_compound fluids and secretions Chemical Engineering (miscellaneous) Environmental Chemistry Radiology Nuclear Medicine and imaging 0105 earth and related environmental sciences Chemistry business.industry Organic Chemistry Ultrasound Chemical oxygen demand Biodegradation 021001 nanoscience & nanotechnology stomatognathic diseases Anaerobic digestion Activated sludge Sodium hydroxide 0210 nano-technology business Nuclear chemistry |
| Zdroj: | Ultrasonics Sonochemistry. 48:432-440 |
| ISSN: | 1350-4177 |
| Popis: | Ultrasound (ULS), sodium hydroxide (NaOH) and combined ultrasound/NaOH pre-treatment were applied to pre-treat waste activated sludge and improve the subsequent anaerobic digestion. Synergistic effect was observed when NaOH treatment was coupled with ultrasound treatment. The highest synergistic Chemical Oxygen Demand (COD) solubilization was observed when 0.02M NaOH was combined with five minutes ultrasonication: an extra 3,000 mg/L was achieved on top of the NaOH (1,975 mg/L) and ultrasonication (2,900 mg/L) treatment alone. Further increase of NaOH dosage increased Soluble Chemical Oxygen Demand (SCOD), but did not increase the synergistic effect. Nine minutes and 18 minutes ultrasonication led to 20% and 24% increase of methane production, respectively; Whereas, 0.05M NaOH pre-treatment did not improve the sludge biodegradability. Combined ultrasound/NaOH (9min+0.05M) showed 31% increase of methane production. A stepwise NaOH addition/ultrasound pre-treatment (0.02M+ULS for 5 min + 0.02M+ULS for 4 min) was tested and resulted in 40% increase of methane production using 20% less chemicals. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect