Effect of additional food waste slurry generated by mesophilic acidogenic fermentation on nutrient removal and sludge properties during wastewater treatment

Jialing Tang; Yunhui Pu; Xiaochang C Wang; Yisong Hu; Jin Huang; Huu Hao Ngo; Shengwang Pan; Yuyou Li; Nengmin Zhu

doi:10.1016/j.biortech.2019.122218

Effect of additional food waste slurry generated by mesophilic acidogenic fermentation on nutrient removal and sludge properties during wastewater treatment

Bioresour Technol. 2019 Dec:294:122218. doi: 10.1016/j.biortech.2019.122218. Epub 2019 Oct 3.

Authors

Jialing Tang¹, Yunhui Pu², Xiaochang C Wang³, Yisong Hu⁴, Jin Huang², Huu Hao Ngo⁵, Shengwang Pan², Yuyou Li⁶, Nengmin Zhu⁷

Affiliations

¹ School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China; Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China.
² School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China.
³ Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Xi'an 710055, China; Engineering Technology Research Center for Wastewater Treatment and Reuse, Shaanxi Province, China. Electronic address: xcwang@xauat.edu.cn.
⁴ Key Lab of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an 710055, China; International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Xi'an 710055, China.
⁵ Centre for Technology in Water and Wastewater, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia.
⁶ Department of Civil and Environmental Engineering, Tohoku University, Sendai 9808579, Japan.
⁷ Biogas Scientific Research Institute of the Ministry of Agriculture, Chengdu 610041, China.

PMID: 31606600
DOI: 10.1016/j.biortech.2019.122218

Abstract

Fermentation slurry from food waste (FSFW) generated by acidogenic fermentation at mesophilic temperature was utilized to improve the nutrients removal from wastewater. Organic acids (such as lactate and volatile fatty acids) in the FSFW behaved as readily biodegradable carbon sources, while the particulate and macromolecular organics acted as slowly biodegradable carbon sources during denitrification processes. The FSFW dosage significantly influenced the nitrogen removal performance, and a C/N ratio (in terms of chemical oxygen demand to nitrogen ratio) of 8 could achieve complete denitrification in the batch tests. In a sequencing batch reactor (SBR) using FSFW for long-term wastewater treatment, extracellular polymeric substances (EPS) gradually accumulated, sludge particle size significantly increased, and microbial communities were selectively enriched, which contributed to promoting the nitrogen (>80%) and phosphate (90.1%) removal efficiencies. Overall, the FSFW produced by acidogenic fermentation under mesophilic temperature served as an excellent intermediary between FW valorization and wastewater treatment.

Keywords: C/N ratio; Carbon source; Fermentation slurry from food waste; Microbial community; Nutrient removal.

MeSH terms

Bioreactors
Carbon
Denitrification
Fermentation
Food
Nitrogen
Nutrients
Refuse Disposal*
Sewage
Waste Disposal, Fluid
Wastewater*

Substances

Sewage
Waste Water
Carbon
Nitrogen