期刊
BIORESOURCE TECHNOLOGY
卷 173, 期 -, 页码 272-283出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2014.09.121
关键词
Fluidized bed bioreactor; Denitrification; Nitrous oxide; Extracellular polymeric substances (EPS); Biofilm
资金
- Natural Science and Engineering Research Council of Canada (NSERC)
- Ontario Graduate Scholarship (OGS), Canada
- Trojan Technologies, ON, Canada
Nitrous oxide (N2O) is a significant anthropogenic greenhouse gases (AnGHGs) emitted from biological nutrient removal (BNR) processes. In this study, N2O production from denitrifying fluidized bed bioreactors (DFBBR) was reduced using calcium (Ca2+) dosage. The DFBBRs were operated on a synthetic municipal wastewater at four different calcium concentrations ranging from the typical municipal wastewater Ca2+ concentration (60 mg Ca2+/L) to 240 mg Ca2+/L at two different COD/N ratios. N2O emission rates, extracellular polymeric substances (EPS), water quality parameters, and microscopic images were monitored regularly in both phases. Calcium concentrations played a significant role in biofilm morphology with the detachment rates for R-120Ca, R-180Ca, and R-240Ca 75% lower than for R-60Ca, respectively. The N2O conversion rate at the typical municipal wastewater Ca2+ concentration (R-60Ca) was about 0.53% of the influent nitrogen loading as compared with 0.34%, 0.42%, and 0.41% for R-120Ca, R-180Ca, and R-240Ca, respectively corresponding to 21-36% reduction. (C) 2014 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据