TY - JOUR
T1 - Enhancing denitrification using a novel in situ membrane biofilm reactor (isMBfR)
AU - Wu, Yonghong
AU - Li, Yizhou
AU - Ontiveros-Valencia, Aura
AU - Ordaz-Díaz, Luis
AU - Liu, Junzhuo
AU - Zhou, Chen
AU - Rittmann, Bruce
N1 - Funding Information:
This work was also supported by the National Natural Science Foundation of China (41422111), the State Key Development Program for Basic Research of China (2015CB158200) and the Natural Science Foundation of Jiangsu Province China (BK20150066). This work was also supported by Youth Innovation Promotion Association, Chinese Academy of Sciences (2014269).
Publisher Copyright:
© 2017 Elsevier Ltd
PY - 2017
Y1 - 2017
N2 - The insufficient supply of electron donor in surface water contaminated with nitrate leads to its incomplete reduction in natural or constructed wetlands. Although the addition of organic matter (represented as chemical oxygen demand, COD) can stimulate N removal by denitrification, direct supplementation of COD creates unacceptable risks to effluent quality. An alternative for stimulating denitrification is supplying hydrogen gas (H2) as an inorganic electron donor. We evaluate an innovative means to do H2-based denitrification of surface waters in a wetland setting: the in-situ membrane biofilm reactor (isMBfR), in which H2 is delivered to a biofilm of denitrifying bacteria on demand based on the presence of nitrate. We carried out a proof-of-concept study in which an upper “photo zone” and a lower “MBfR root zone” were combined to remove nitrate and COD from simulated surface water. Employing mass-balances for H2, COD, nitrate, and oxygen, we documented nearly complete removals of nitrate and COD, except when the H2 supply was intentionally shut off. All nitrate removal was accomplished in the “MBfR root zone,” where H2 delivery supplemented the COD supply (as needed) and provided the large majority of electron equivalents to reduce nitrate to N2.
AB - The insufficient supply of electron donor in surface water contaminated with nitrate leads to its incomplete reduction in natural or constructed wetlands. Although the addition of organic matter (represented as chemical oxygen demand, COD) can stimulate N removal by denitrification, direct supplementation of COD creates unacceptable risks to effluent quality. An alternative for stimulating denitrification is supplying hydrogen gas (H2) as an inorganic electron donor. We evaluate an innovative means to do H2-based denitrification of surface waters in a wetland setting: the in-situ membrane biofilm reactor (isMBfR), in which H2 is delivered to a biofilm of denitrifying bacteria on demand based on the presence of nitrate. We carried out a proof-of-concept study in which an upper “photo zone” and a lower “MBfR root zone” were combined to remove nitrate and COD from simulated surface water. Employing mass-balances for H2, COD, nitrate, and oxygen, we documented nearly complete removals of nitrate and COD, except when the H2 supply was intentionally shut off. All nitrate removal was accomplished in the “MBfR root zone,” where H2 delivery supplemented the COD supply (as needed) and provided the large majority of electron equivalents to reduce nitrate to N2.
KW - Chemical oxygen demand
KW - Hydrogen
KW - Membrane biofilm reactor
KW - Nitrate reduction
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U2 - 10.1016/j.watres.2017.04.054
DO - 10.1016/j.watres.2017.04.054
M3 - Article
C2 - 28463771
AN - SCOPUS:85018297181
SN - 0043-1354
VL - 119
SP - 234
EP - 241
JO - Water Research
JF - Water Research
ER -