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Kinetics of anaerobic methane oxidation coupled to denitrification in the membrane biofilm reactor
Author(s) -
Tang Youneng,
Zhang Zhiming,
Rittmann Bruce E.,
Lee HyungSool
Publication year - 2019
Publication title -
biotechnology and bioengineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.136
H-Index - 189
eISSN - 1097-0290
pISSN - 0006-3592
DOI - 10.1002/bit.27098
Subject(s) - denitrification , methane , nitrate , anaerobic oxidation of methane , chemistry , flux (metallurgy) , biofilm , oxygen , anaerobic exercise , environmental chemistry , nitrogen , bacteria , biology , organic chemistry , genetics , physiology
Anaerobic oxidation of methane coupled to denitrification (AOM‐D) in a membrane biofilm reactor (MBfR), a platform used for efficiently coupling gas delivery and biofilm development, has attracted attention in recent years due to the low cost and high availability of methane. However, experimental studies have shown that the nitrate‐removal flux in the CH 4 ‐based MBfR (<1.0 g N/m 2 ‐day) is about one order of magnitude smaller than that in the H 2 ‐based MBfR (1.1–6.7 g N/m 2 ‐day). A one‐dimensional multispecies biofilm model predicts that the nitrate‐removal flux in the CH 4 ‐based MBfR is limited to <1.7 g N/m 2 ‐day, consistent with the experimental studies reported in the literature. The model also determines the two major limiting factors for the nitrate‐removal flux: The methane half‐maximum‐rate concentration (K 2 ) and the specific maximum methane utilization rate of the AOM‐D syntrophic consortium (k max2 ), with k max2 being more important. Model simulations show that increasing k max2 to >3 g chemical oxygen demand (COD)/g cell‐day (from its current 1.8 g COD/g cell‐day) and developing a new membrane with doubled methane‐delivery capacity (D m ) could bring the nitrate‐removal flux to ≥4.0 g N/m 2 ‐day, which is close to the nitrate‐removal flux for the H 2 ‐based MBfR. Further increase of the maximum nitrate‐removal flux can be achieved when D m and k max2 increase together.