Methods for measuring the degree of stability of aerobic stabilized sludges
| Autor: | B. Paulsrud, A.S. Eikum |
|---|---|
| Rok vydání: | 1977 |
| Předmět: |
Environmental Engineering
Waste management Chemistry Ecological Modeling Pollution Degree (temperature) Wastewater Oxygen uptake rate Batch operation Aeration Waste Management and Disposal Wastewater quality indicators Intensity (heat transfer) Water Science and Technology Civil and Structural Engineering |
| Zdroj: | Water Research. 11:763-770 |
| ISSN: | 0043-1354 |
| DOI: | 10.1016/0043-1354(77)90044-6 |
| Popis: | This study was conducted to find one or several parameters that can be used as a measure of the degree of stability of wastewater sludges and to define in terms of the measured parameters what is meant by a fully stabilized sludge. Based on the data from this study, the following requirements regarding odour should be met before an aerobically stabilized sludge can be considered as a fully stabilized sludge: The Odour Intensity Index (ASTM D1292) should not exceed 11 at any time during 14 days of storage at 20°C, unless the odour can clearly be classified as a typical “soil” odour. Oxygen uptake rate was found to be a reliable indicator of sludge stability if the temperature effect is taken into consideration. It was also experienced that short aeration period (2–8 days during batch operation) would make the sludge less suitable for storage since they would give a higher rise in odour intensity than raw sludges. This would probably not be true for biological sludges. The reduction of BOD and COD in the sludge liquor could not be used to measure sludge stability. |
| Databáze: | OpenAIRE |
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