Acetic acid recovery from a hybrid biological-hydrothermal treatment process of sewage sludge - a pilot plant study
| Autor: | Robert Lei, N. Wijaya, Peter Dare, Ben McDonald, G. Estcourt, John Andrews, Daniel J. Gapes |
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| Rok vydání: | 2015 |
| Předmět: |
Environmental Engineering
Nitrogen Pilot Projects Waste Disposal Fluid Acetic acid chemistry.chemical_compound Bioreactors Wet oxidation Anaerobiosis Water Science and Technology Acetic Acid Biological Oxygen Demand Analysis Waste management Sewage Chemistry Chemical oxygen demand Phosphorus Pulp and paper industry Fatty Acids Volatile Carbon Anaerobic digestion Pilot plant Volatile suspended solids Fermentation Propionates Oxidation-Reduction Sludge |
| Zdroj: | Water science and technology : a journal of the International Association on Water Pollution Research. 71(5) |
| ISSN: | 0273-1223 |
| Popis: | A two-stage process consisting of anaerobic fermentation followed by sub-critical wet oxidation was used to generate acetic acid from sewage sludge at pilot scale. Volatile fatty acids, dominated by propionic acid, were produced over 4–6 days in the 2,000 L fermentation reactor, which also achieved 31% solids reduction. Approximately 96% of the carbon was retained in solution over the fermentation stage. Using a 200 L wet oxidation reactor operating in batch mode, the second stage achieved 98% volatile suspended solids (VSS) destruction and 67% total chemical oxygen demand (tCOD) destruction. Acetic acid produced in this stage was recalcitrant to further degradation and was retained in solution. The gross yield from VSS was 16% for acetic acid and 21% for volatile fatty acids across the process, higher than reported yields for wet oxidation alone. The pilot plant results showed that 72% of the incoming phosphorus was retained in the solids, 94% of the nitrogen became concentrated in solution and 41% of the carbon was converted to a soluble state, in a more degradable form. Acetic acid produced from the process has the potential to be used to offset ethanol requirements in biological nutrient removal plants. |
| Databáze: | OpenAIRE |
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