AI Article Synopsis
- Perchlorate is a common drinking water contaminant, and while membrane-biofilm reactors can reduce it, achieving low levels is tough.
- Adding chlorate boosted the growth of perchlorate-reducing bacteria, resulting in better perchlorate removal (23 μg/L) compared to the control (53 μg/L).
- However, the addition of chlorate also inhibited sulfate reduction, although this effect was temporary.
Article Abstract
Perchlorate is a widespread drinking water contaminant with regulatory standards ranging from 2 to 18 μg/L. The hydrogen-based membrane-biofilm reactor (MBfR) can effectively reduce perchlorate, but it is challenging to achieve low-µg/L levels. We explored chlorate addition to increase the abundance of perchlorate-reducing bacteria (PRB) and improve removals. MBfR reactors were operated with and without chlorate addition. Results show that chlorate doubled the abundance of putative PRB (e.g., Rhodocyclales) and improved perchlorate reduction to 23 ± 17 µg/L, compared to 53 ± 37 µg/L in the control. Sulfate reduction was substantially inhibited during chlorate addition, but quickly recovered once suspended. Our results suggest that chlorate addition can enhance perchlorate reduction by providing a selective pressure for PRB. It also decreases net sulfate reduction. KEY POINTS: • Chlorate increased the abundance of perchlorate-reducing bacteria • Chlorate addition improved perchlorate removal • Chlorate appeared to suppress sulfate reduction.
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| http://dx.doi.org/10.1007/s00253-022-11976-1 | DOI Listing |
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