Evaluation of the accuracy of two simple methods for microscopic activated sludge analysis
| Autor: | Mateusz Sobczyk, Joanna Starzycka-Giża, Agnieszka Pajdak-Stós, Wioleta Kocerba-Soroka, Edyta Fiałkowska, Janusz Fyda |
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| Rok vydání: | 2018 |
| Předmět: |
Biochemical oxygen demand
Environmental Engineering Nitrogen 02 engineering and technology Biological Oxygen Demand Analysis 010501 environmental sciences Waste Disposal Fluid 01 natural sciences Bioreactors microscopic analysis activated sludge Effluent 0105 earth and related environmental sciences Water Science and Technology Suspended solids Sewage Chemical oxygen demand Reproducibility of Results Phosphorus sludge index 021001 nanoscience & nanotechnology Pulp and paper industry Activated sludge Environmental science Sewage treatment Poland 0210 nano-technology Eikelboom and van Buijsen method Waste disposal |
| Zdroj: | Water Science and Technology. 78:2104-2112 |
| ISSN: | 1996-9732 0273-1223 |
| Popis: | Biological microscopic analysis is a popular method employed in wastewater treatment plants worldwide for evaluating activated sludge condition. However, many operators still have reservations regarding its reliability. In this study, we evaluated and compared two methods of microscopic sludge investigation: the sludge index (SI) and the Eikelboom–van Buijsen method (EB). We investigated 79 activated sludge samples from nine treatment plants located in southern Poland over a 1-year period. For each sample, sludge volume index values were calculated and compared with the results of evaluation made on the basis of microscopic analysis. Additionally, the effluent quality was analysed in 45 of 79 cases, including investigation of suspended solids, biochemical oxygen demand, chemical oxygen demand, total nitrogen and total phosphorous. The sign test and Wilcoxon matched pairs test showed that a significant difference existed between the two investigated methods. General conclusions from both methods do not provide reliable information concerning nitrogen and phosphorus removal. The EB method had a tendency to be more conservative in its general conclusions than the SI method. Both are highly reliable for estimating activated sludge quality and solid separation properties. |
| Databáze: | OpenAIRE |
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