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Water quality assessment of groundwater treated with a membrane biofilm reactor
A water quality evaluation was conducted for groundwater treated by a membrane biofilm reactor; the treatment target was bioreduction of nitrate (~ 9.4 mg/L N) and perchlorate (12.5 μg/L). When hydrogen (H2) was limited, the order of H2 utilization was dissolved oxygen, nitrate, nitrite, chlorate, perchlorate, and then sulfate, which was reduced to H2S only if the H2 pressure was high and all other oxidized compounds were at least 99.5% reduced. Because nitrite and H2S are easy to measure in the field, this reduction order allows a convenient means for onsite monitoring of the appropriate H2 pressure. Advective H2 loss was negligible, acetate and methane were not formed, and increases in dissolved organic carbon and biodegradable dissolved organic carbon were negligible. The increase in alkalinity (20‐40 mg/L as calcium carbonate) was associated only with nitrite reduction, and hardness was not lost to calcium carbonate precipitation when the influent Langlier saturation index was ~ ‐0.44.
Water quality assessment of groundwater treated with a membrane biofilm reactor
A water quality evaluation was conducted for groundwater treated by a membrane biofilm reactor; the treatment target was bioreduction of nitrate (~ 9.4 mg/L N) and perchlorate (12.5 μg/L). When hydrogen (H2) was limited, the order of H2 utilization was dissolved oxygen, nitrate, nitrite, chlorate, perchlorate, and then sulfate, which was reduced to H2S only if the H2 pressure was high and all other oxidized compounds were at least 99.5% reduced. Because nitrite and H2S are easy to measure in the field, this reduction order allows a convenient means for onsite monitoring of the appropriate H2 pressure. Advective H2 loss was negligible, acetate and methane were not formed, and increases in dissolved organic carbon and biodegradable dissolved organic carbon were negligible. The increase in alkalinity (20‐40 mg/L as calcium carbonate) was associated only with nitrite reduction, and hardness was not lost to calcium carbonate precipitation when the influent Langlier saturation index was ~ ‐0.44.
Water quality assessment of groundwater treated with a membrane biofilm reactor
Ziv‐El, Michal C. (author) / Rittmann, Bruce E. (author)
Journal ‐ American Water Works Association ; 101 ; 77-83
2009-12-01
7 pages
Article (Journal)
Electronic Resource
English
Alkalinity , Perchlorate , Calcium Carbonate , Biofilm , pH , Water Quality , Membranes , Reactors , Hydrogen , Oxidation , Hardness , Sulfates , Organic Carbon
Bioreduction of nitrate in groundwater using a pilot-scale hydrogen-based membrane biofilm reactor
| Springer Verlag | 2010
| British Library Online Contents | 2006