Start-up and operation of anaerobic digesters with automatic bicarbonate control
| Autor: | M.C. Tomei, Alberto Rozzi, N. Limoni, A. C. Di Pinto |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Environmental Engineering
Waste management Automatic control Renewable Energy Sustainability and the Environment Chemistry Bicarbonate Alkalinity Bioengineering General Medicine Start up complex mixtures Volumetric flow rate chemistry.chemical_compound Loading rate Waste Management and Disposal Effluent Anaerobic exercise |
| Zdroj: | Bioresource Technology. 48:215-219 |
| ISSN: | 0960-8524 |
| DOI: | 10.1016/0960-8524(94)90149-x |
| Popis: | In this paper, anaerobic-process control based on bicarbonate alkalinity addition and regulation during start-up and overload operation is described. The experiments were performed with laboratory-scale hybrid digesters fed on olive-mill effluents. An automatic instrument monitored bicarbonate concentration and controlled its value in each reactor by alkali addition. Two different start-up procedures were tested: step-increases of substrate concentration at constant feed-flow rate and step-increases of flow rate at constant feed-concentration, keeping in-reactor bicarbonate alkalinity constant by automatic control. Two overload experiments were carried out. In the first case, the volumetric loading rate was increased, as described above, up to 8 kg TOC m3d keeping both reactors under automatic control. No major differences were observed in the performance of the reactors. In the second case, overload was induced by a 100% step-increase of the substrate concentration as acetic acid and alkalinity was controlled in one reactor only. As expected, the system without control became unstable and sour conditions developed. |
| Databáze: | OpenAIRE |
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