Abstract
In this study, the sediments from the Liuyang River (Hunan Province, China) were used as an inoculum to bio-reduction perchlorate in a bio-electrochemical reactor (BER). The efficient degradation of perchlorate was found in the BER by utilizing the hydrogen as electron donor. When the current intensity was 10 mA and HRT was 72 h, the removal rate of perchlorate (initial concentration was 5 mg/L) reached 84.13% and a removal flux of 178.68 mg/m2·d was achieved. High-throughput sequencing analysis confirmed that the biofilm in the reactor had been successfully acclimated, and the system could achieve perchlorate reduction effectively. Firmicutes and Bacteroidetes were the dominant phyla during inoculation phase, and Actinobacteriria, Proteobacteria, and Tenericutes also constituted a low proportion in the biofilm. Bacilli and Clostridia were dominant at class-level both in inoculum and biofilm, with the relative abundance about 56%-72% and 17%-23%, respectively. These results confirmed that the biofilm in the BER system had been successfully formed, and the BER system could biodegradation perchlorate effectively.
Highlights
The perchlorate contamination has received great attention over the past years
The fireworks discharge area of Liuyang River sediments were used as the source of inoculated microorganisms
Most of particles fall into the Liuyang River and the perchlorate concentration was higher than 1.0 mg/L
Summary
The perchlorate contamination has received great attention over the past years. Perchlorate is widely distributed in the natural environment, because of the widespread use of explosives and disinfectants [1, 2], and attribute to its inherent properties, such as high solubility, slow response, and low adsorption [3, 4]. The concentration of perchlorate in groundwater is below 100 μg/L, but it can reach 20 mg/L or higher level in some surface waters [5, 6]. Perchlorate can threat human health by interfering with the production of thyroid hormones, and subsequently inhibiting the development of the skeletal system and the central nervous system of infant [7]. Owing to the perchlorate charge and ionic radius are very close to that of iodide, perchlorate could compete with iodide for entry into the thyroid gland, leading to inhibition of iodine uptake and further affecting thyroid function [8].Membrane filtration, ion exchange (IX), and electrochemical reduction are typically strategies for removing perchlorate from water [2, 9, 10]. Biological reduction has been proven to be the most effective and
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