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Insights on the solubilization products after combined alkaline and ultrasonic pre-treatment of sewage sludge |
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| Authors: | Xinbo Tian Chong Wang Antoine Prandota Trzcinski Leonard Lin Wun Jern Ng |
| Institution: | 1. Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University,Singapore 637141, Singapore;School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore 2. Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University,Singapore 637141, Singapore 3. Public Utilities Board, Water Reclamation(Plants)Department, Singapore 628507, Singapore 4. Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore 637141, Singapore;School of Civil and Environmental Engineering, Nanyang Technological University, Singapore 639798, Singapore |
| Abstract: | This work provides insights on the solubilization products after a simultaneous combination of alkaline and ultrasonic(ALK + ULS) pre-treatment of sewage sludge.Soluble chemical oxygen demand(SCOD) increased from 1200 to 11,000 mg/L after such treatment. Organics with molecular weight around 5.6 k Da were solubilized because of the synergistic effect of ultrasound and alkali. Organics with molecular weight larger than300 k Da increased from 7.8% to 60%, 16% and 42.3% after ULS, ALK and ALK + ULS treatment, respectively. Excitation emission matrix fluorescence spectroscopy analysis identified soluble microbial product-like and humic acid-like matters as the main solubilization products. Sludge anaerobic biodegradability was significantly enhanced with the simultaneous application of ALK + ULS pre-treatment. ALK + ULS pre-treatment resulted in 37.8% biodegradability increase compared to the untreated sludge. This value was higher compared to the biodegradability increase induced by individual ALK pre-treatment(5.7%) or individual ULS pre-treatment(20.7%) under the same conditions applied. |
| Keywords: | Ultrasound Alkali Sewage sludge Molecular weight Excitation emission matrix (EEM) Anaerobic biodegradability |
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