In-situ fixed bed denitrification in sequential biofiltration: laboratory testing of solid substrates
| Autor: | Josefine Filter, Christin Bosinsky, Sefine Oksal Kilinc, Aki Sebastian Ruhl, Martin Jekel |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Journal of Water Reuse and Desalination, Vol 10, Iss 4, Pp 394-404 (2020) |
| Druh dokumentu: | article |
| ISSN: | 2220-1319 2408-9370 |
| DOI: | 10.2166/wrd.2020.005 |
| Popis: | High nitrate concentrations in wastewater treatment plant effluents and aquifers can challenge sequential biofiltration systems in preventing nitrite and gas formation in the sand bed, as well as to achieve the regulated limit value for nitrate in potable water reuse applications. This study investigates the introduction of electron donors in the form of organic fixed bed materials as an in-situ anoxic zone into sequential biofiltration systems. Laboratory batch and column tests with straw, soft wood, peat, polylactic acid (PLA), and polycaprolacton (PCL) revealed incomplete denitrification with a hydraulic retention time below 10 h, high organic carbon leaching, especially during the first three months, and gas accumulation within the filter bed. Therefore, ex-situ denitrification prior to oxic biofilters or in a defined side-stream treatment is recommended. No enhanced transformation of trace organic chemicals was observed under nitrate reducing conditions. Peat revealed a sorption potential for 5-methyl-benzotriazole, carbamazepine, benzotriazole, and metoprolol. |
| Databáze: | Directory of Open Access Journals |
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