Evaluating the nitrogen-contaminated groundwater treatment by a denitrifying granular sludge bioreactor: effect of organic matter loading
| Autor: | Alejandro Gonzalez-Martinez, Riku Vahala, Miguel Hurtado-Martinez, Jesús González-López, Alejandro Rodriguez-Sanchez, Barbara Muñoz-Palazon |
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| Rok vydání: | 2021 |
| Předmět: |
chemistry.chemical_classification
Denitrification Sewage Nitrogen Health Toxicology and Mutagenesis Biomass General Medicine 010501 environmental sciences 01 natural sciences Pollution chemistry.chemical_compound Denitrifying bacteria Bioreactors Nitrate chemistry Environmental chemistry Bioreactor Environmental Chemistry Organic matter Nitrite Groundwater 0105 earth and related environmental sciences |
| Zdroj: | Environmental Science and Pollution Research. 28:41351-41364 |
| ISSN: | 1614-7499 0944-1344 |
| Popis: | A sequential bed granular bioreactor was adapted to treat nitrate-polluted synthetic groundwater under anaerobic conditions and agitation with denitrification gas, achieving very efficient performance in total nitrogen removal at influent organic carbon concentrations of 1 g L-1 (80–90%) and 0.5 g L-1 (70–80%) sodium acetate, but concentrations below 0.5 g L-1 caused accumulation of nitrite and nitrate and led to system failure (30–40% removal). Biomass size and settling velocity were higher above 0.5 g L-1 sodium acetate. Trichosporonaceae dominated the fungal populations at all times, while a dominance of terrestrial group Thaumarchaeota and Acidovorax at 1 and 0.5 g L-1 passed to a domination of Methanobrevibacter and an unclassified Comamonadaceae clone for NaAc lower than 0.5 g L-1. The results obtained pointed out that the denitrifying granular sludge technology is a feasible solution for the treatment of nitrogen-contaminated groundwater, and that influent organic matter plays an important role on the conformation of microbial communities within it and, therefore, on the overall efficiency of the system. |
| Databáze: | OpenAIRE |
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