Salinity enhances high optically active L-lactate production from co-fermentation of food waste and waste activated sludge: Unveiling the response of microbial community shift and functional profiling

Xiang Li; Safeena Sadiq; Wenjuan Zhang; Yiren Chen; Xianbao Xu; Anees Abbas; Shanping Chen; Ruina Zhang; Gang Xue; Dominika Sobotka; Jacek Makinia

doi:10.1016/j.biortech.2020.124124

Salinity enhances high optically active L-lactate production from co-fermentation of food waste and waste activated sludge: Unveiling the response of microbial community shift and functional profiling

Bioresour Technol. 2021 Jan:319:124124. doi: 10.1016/j.biortech.2020.124124. Epub 2020 Sep 17.

Authors

Xiang Li¹, Safeena Sadiq¹, Wenjuan Zhang², Yiren Chen¹, Xianbao Xu³, Anees Abbas⁴, Shanping Chen⁵, Ruina Zhang⁵, Gang Xue⁶, Dominika Sobotka⁷, Jacek Makinia⁷

Affiliations

¹ State Environmental Protection Engineering Centre for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China.
² College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China.
³ State Environmental Protection Engineering Centre for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China. Electronic address: 18621035295@163.com.
⁴ Department of Chemistry, University of Mianwali, 42200 Mianwali, Pakistan.
⁵ Shanghai Municipal Solid Waste Engineering Technology Research Center, Shanghai Institute for Design & Research on Environmental Engineering Co., Ltd, Shanghai Environmental Sanitary Engineering Design Institute Co., Ltd, Shilong Road 345, Shanghai 200232, China.
⁶ State Environmental Protection Engineering Centre for Pollution Treatment and Control in Textile Industry, College of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
⁷ Faculty of Civil and Environmental Engineering, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdansk, Poland.

PMID: 32977090
DOI: 10.1016/j.biortech.2020.124124

Abstract

Lactic acid (LA), a versatile platform molecule, can be fermented from organic wastes, such as food waste and waste activated sludge. In this study, an efficient approach using salt, a component of food waste as an additive, was proposed to increase LA production. The LA productivity was increased at 10 g NaCl/L and optical pure L-lactate was obtained at 30 g NaCl/L. The enhancement of LA was in accordance with the increased solubilization and the critical hydrolase activities under saline conditions. Moreover, high salinity (30-50 g NaCl/L) changed the common conversion of LA to volatile fatty acids. In addition, the key LA bacteria genera (Bacillus, Enterococcus, Lactobacillus) were selectively enriched under saline conditions. Strong correlations between salinity and functional genes for L-LA production were also observed. This study provides a practical way for the enrichment of L-LA with high optical activity from organic wastes.

Keywords: Food waste; Lactic acid; Optical activity; Salt; Waste activated sludge.

MeSH terms

Fatty Acids, Volatile
Fermentation
Food
Lactic Acid
Microbiota*
Refuse Disposal*
Salinity
Sewage

Substances

Fatty Acids, Volatile
Sewage
Lactic Acid