Abstract
The H2-based membrane biofilm reactor (MBfR) was used to remove nitrate and perchlorate from real ion-exchange brine at two different salinities (30- and 50-g/L NaCl). Base production from nitrate reduction to N2 gas caused the pH to increase, and this exacerbated precipitation of calcium and magnesium carbonates onto the MBfR fibers. The precipitates lowered the H 2 flux to the biofilm and caused a deterioration of denitrification performance that could be reversed by mild citric-acid washing. The addition of acid seems to be the only mechanism to avoid serious precipitation, membrane fouling, and non-optimal pH for denitrification.
Original language | English (US) |
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Pages (from-to) | 1453-1458 |
Number of pages | 6 |
Journal | Water Science and Technology |
Volume | 63 |
Issue number | 7 |
DOIs | |
State | Published - 2011 |
Keywords
- Ion-exchange brine
- MBfR
- Nitrate
- Salinity
- Solubility
ASJC Scopus subject areas
- Environmental Engineering
- Water Science and Technology