文献类型：期刊文献

英文题名：Influences of Longitudinal Heterogeneity on Nitrous Oxide Production from Membrane-Aerated Biofilm Reactor: A Modeling Perspective

作者：Chen, Xueming[4];Yang, Linyan[1];Sun, Jing[2];Wei, Wei[3];Liu, Yiwen[3];Ni, Bing-Jie[3]

机构：[1]East China Univ Sci & Technol, Sch Resources & Environm Engn, Shanghai 200237, Peoples R China;[2]Tongji Univ, State Key Lab Pollut Control & Resources Reuse, Coll Environm Sci & Engn, Shanghai 200092, Peoples R China;[3]Univ Technol Sydney, Sch Civil & Environm Engn, Ctr Technol Water & Wastewater, Sydney, NSW 2007, Australia;[4]Fuzhou Univ, Coll Environm & Resources, Fuzhou 350116, Fujian, Peoples R China

年份：2020

卷号：54

期号：17

起止页码：10964

外文期刊名：ENVIRONMENTAL SCIENCE & TECHNOLOGY

收录：;EI(收录号：20204109338700);WOS:【SCI-EXPANDED(收录号:WOS:000568649900057)】；

基金：Dr B.-J.N. acknowledges the Australian Research Council (ARC) through Future Fellowship FT160100195. The authors are grateful to the research collaboration.

语种：英文

外文关键词：Nitrogen oxides - Liquids - Oxygen - Bioreactors - Greenhouse gases - Biofilms

摘要：As a promising technology for sustainable nitrogen removal from wastewater, the membrane-aerated biofilm reactors (MABRs) performing autotrophic deammonification are faced with the problem of unwanted production of nitrous oxide (N2O, a potent greenhouse gas). As a common tool to study N2O production from such an MABR, the traditional one-dimensional modeling approach fails to simulate the existence of longitudinal gradients in the reactor and therefore might render N2O production significantly deviated from reality. To this end, this work aims to study the influences of key longitudinal gradients (i.e., in oxygen, liquid-phase components, and biofilm thickness) on the N2O production from a typical MABR performing autotrophic deammonification by applying a modified version of a newly developed compartmental model. Through comparing the modeling results of different reactor configurations, this work reveals that the single impact of the longitudinal gradients studied on the N2O production from the MABR follows the order: oxygen (significant) > liquid-phase components (slight) > biofilm thickness (almost none). When multiple longitudinal gradients are present, they become correlated and would jointly influence the N2O production and nitrogen removal of the MABR. The results also show the need for multispot measurements to get an accurate representation of spatial biofilm features of the MABR configuration with the membrane lumen designed/operated as a plug flow reactor. While the traditional modeling approach is acceptable to evaluate the nitrogen removal in most cases, it might overestimate or underestimate the N2O production from the MABR with at least one of the longitudinal gradients in oxygen and liquid-phase components. For such an MABR, the longitudinal heterogeneity in biofilm thickness and the number of biofilm thickness classes to be included in the model would also make a difference to the simulation results, especially the N2O production. The work also proposes that under the studied conditions, proper design/operation of the MABR in consideration of longitudinal heterogeneity has the theoretical potential of reducing the N2O production by 77% without significantly compromising the nitrogen removal.