Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8844012 | International Biodeterioration & Biodegradation | 2017 | 8 Pages |
Abstract
Perchlorate is a naturally occurring and manufactured chemical anion and can be present in water sources together with nitrate. This study aims at (1) determining the nitrate and perchlorate contamination in a semi-arid plain (Harran Plain) and (2) evaluating the performance of a heterotrophic-autotrophic sequential denitrification process for nitrate and perchlorate removal from the groundwater of this plain. The nitrate in the groundwater samples varied between 4.07 and 83.22 mg lâ1 NO3--N. Perchlorate was added to groundwater samples externally and its concentration was increased from 100 to 1500 μg lâ1. The total nitrogen concentrations in the sequential system effluent throughout the study were always below 0.5 mg lâ1. C/N ratio was 2.44 which was slightly lower than the theoretical level of 2.47. Therefore the average NO3â-N in the heterotrophic reactor effluent was 19 ± 3.7 mg lâ1 corresponding to an efficiency of 75% reduction. The remaining nitrate and nitrite were almost completely reduced in the autotrophic process. The system's perchlorate removal efficiency was above 98%, except during the last period (82%), at which influent perchlorate was 1500 μg lâ1. The maximum perchlorate reduction rate throughout the study was around 15 mg/(L.d). Both perchlorate and nitrate reduction were partial in the heterotrophic reactor, but completed in the following autotrophic process.
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Authors
Deniz Ucar, Emine Ubay Cokgor, Erkan Sahinkaya, Umut Cetin, Ceyhun Bereketoglu, Beste Calimlioglu, Betul Goncu, Adem Yurtsever,