Center for Environmental Biotechnology, Biodesign Institute at Arizona State University, Tempe, AZ 85287-5701, USA.
Water Sci Technol. 2011;63(7):1453-8. doi: 10.2166/wst.2011.330.
The H(2)-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 N(2) 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.
采用基于 H₂ 的膜生物膜反应器（MBfR），在两种不同盐度（30- 和 50-g/L NaCl）下，从实际的离子交换卤水中去除硝酸盐和高氯酸盐。硝酸盐还原为 N₂ 气体导致产生碱，从而加剧了钙和镁碳酸盐在 MBfR 纤维上的沉淀。沉淀物降低了 H₂ 向生物膜的通量，并导致反硝化性能恶化，而温和的柠檬酸清洗可逆转这种恶化。添加酸似乎是避免严重沉淀、膜污染和非最佳反硝化 pH 值的唯一机制。
