Improving the sensitivity of the activated sludge respiration inhibition test and verifying the results using an oxidation-reduction potential electrode
| Autor: | F. Friedrichs, Bich Hanh Nguyen, D. Q. Trung, D. Meinardi, K. U. Rudolph, W. Genthe |
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| Rok vydání: | 2016 |
| Předmět: |
021110 strategic
defence & security studies Environmental Engineering Bacteria Sewage Chemistry 0211 other engineering and technologies 02 engineering and technology 010501 environmental sciences Waste Disposal Fluid 01 natural sciences chemistry.chemical_compound Activated sludge Wastewater Reduction potential Metals Heavy Environmental chemistry Respiration Degradation (geology) Sewage treatment Electrodes Oxidation-Reduction Sodium acetate Oxygen sensor 0105 earth and related environmental sciences Water Science and Technology |
| Zdroj: | Water Science and Technology. 75:247-254 |
| ISSN: | 1996-9732 0273-1223 |
| Popis: | The inhibition of activated sludge respiration is one of the most important parameters for monitoring wastewater toxicity. The main objective of this study was to improve respiration inhibition testing in order to protect the biological degradation within the aerobic process in a wastewater treatment plant more efficiently. In order to influence the sensitivity of the testing bacteria, two different nutrient solutions were selected for biological testing, synthetic wastewater according to ISO 8192 and NaAc (sodium acetate). The effects of the nutrient solutions on heavy metal speciation and their respiration inhibition were investigated. The toxicants Zn(II), Cu(II), Cr(VI) and 3,5 DCP (3,5-dichlorophenol) were used as standards to determine toxicities and to study the influence of nutrient solutions. Results have shown that NaAc as a nutrient solution sensitized the respiration inhibition test up to a factor of 7.7. Furthermore, an oxidation reduction potential electrode can be used as an alternative tool to verify the results obtained with an oxygen sensor. |
| Databáze: | OpenAIRE |
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