Carbon dioxide and methane emission of denitrification bioreactor filling waste sawdust and industrial sludge for treatment of simulated agricultural surface runoff

Hongbing Luo; Daiwei Zhuang; Jinping Yang; Xiaoling Liu; Ke Zhang; Xiaoying Fu; Bing Jiang; Ru Xue; Liangqian Fan; Wei Chen; Lin Cheng; Fenghui Chen; Xiaochan An; Xiaohong Zhang

doi:10.1016/j.jenvman.2021.112503

Carbon dioxide and methane emission of denitrification bioreactor filling waste sawdust and industrial sludge for treatment of simulated agricultural surface runoff

J Environ Manage. 2021 Jul 1:289:112503. doi: 10.1016/j.jenvman.2021.112503. Epub 2021 Apr 3.

Authors

Hongbing Luo¹, Daiwei Zhuang², Jinping Yang², Xiaoling Liu³, Ke Zhang⁴, Xiaoying Fu⁵, Bing Jiang⁶, Ru Xue⁷, Liangqian Fan², Wei Chen², Lin Cheng², Fenghui Chen², Xiaochan An², Xiaohong Zhang⁷

Affiliations

¹ Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China; Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Sichuan Agricultural University, Chengdu, 611830, China. Electronic address: hbluo@sicau.edu.cn.
² Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China.
³ Department of Information Engineering, Sichuan Water Conservancy Vocational College, Chengdu, 611231, China.
⁴ Department of Municipal Engineering, College of Civil Engineering, Sichuan Agricultural University, Chengdu, 611830, China; Sichuan Higher Education Engineering Research Center for Disaster Prevention and Mitigation of Village Construction, Sichuan Agricultural University, Chengdu, 611830, China.
⁵ State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China.
⁶ Dujiangyan Campus, Sichuan Agricultural University, Chengdu, 611830, China.
⁷ College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, China.

PMID: 33823415
DOI: 10.1016/j.jenvman.2021.112503

Abstract

Carbon dioxide (CO₂) and methane (CH₄) produced by denitrification bioreactors in processing agricultural surface runoff have contributed to increasing proportion of greenhouse gases (GHG) emissions. It is the first time to monitor and quantify the emission flux of CO₂ and CH₄ produced by laboratory-scale denitrification bioreactors which recycled waste Cunninghamia lanceolata sawdust (CLS) and industrial sludge (IS) as fillers to process simulated agricultural surface runoff. Sludge-water ratio, inflow rate and water flow direction are used as experimental factors to study the effect on the emission flux of CO₂ and CH₄. Results show that emission flux of CO₂ from denitrification bioreactors with different sludge-water ratio approached 20 mg m^-2h^-1, simultaneously the average emission flux of CH₄ produced by all bioreactors was 1.785 mg m^-2h^-1. The addition of sludge increased the emission flux of CH₄ and had no significant effect on the emission flux of CO₂. Increasing the inflow rate reduced the CO₂ emission flux from 21.57 to 1.27 mg m^-2h^-1, and at the same time increased the CH₄ emission flux from 0.007 to 9.54 mg m^-2h^-1. The gravity flow of wastewater reduced the emission flux of CO₂ and CH₄. The emissions of CO₂ and CH₄ from folded plate denitrification bioreactor with CLS and industrial sludge with a volume ratio of 1:2 can be reduced by 24.67% and 73.3%, respectively. There was no need to add special gas collection and treatment devices because CO₂ and CH₄ emission fluxes produced by the folded plate denitrification bioreactor and gravity denitrification bioreactor are not enough to increase the greenhouse effect. This study quantified the CO₂ and CH₄ produced by denitrification bioreactors filling CLS and IS, and provided a reference for future research on the gases produced by the denitrification process.

Keywords: Carbon dioxide; Folded plate denitrification bioreactor; Gravity flow of denitrification bioreactor; Industrial sludge; Methane; Waste sawdust.

MeSH terms

Bioreactors
Carbon Dioxide* / analysis
Denitrification
Methane*
Nitrous Oxide / analysis
Sewage

Substances

Sewage
Carbon Dioxide
Nitrous Oxide
Methane