Enhanced chloride-free snow-melting agent generation from organic wastewater by integrating bioconversion and synthesis

Yijie Wang; Zhenxing Huang; Mingxing Zhao; Hengfeng Miao; Wansheng Shi; Wenquan Ruan

doi:10.1016/j.biortech.2022.128200

Enhanced chloride-free snow-melting agent generation from organic wastewater by integrating bioconversion and synthesis

Bioresour Technol. 2022 Dec:366:128200. doi: 10.1016/j.biortech.2022.128200. Epub 2022 Oct 27.

Authors

Yijie Wang¹, Zhenxing Huang¹, Mingxing Zhao², Hengfeng Miao³, Wansheng Shi³, Wenquan Ruan³

Affiliations

¹ School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China; Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, Jiangnan University, Wuxi 214122, China.
² School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China; Jiangsu Engineering Laboratory for Biomass Energy and Carbon Reduction Technology, Jiangnan University, Wuxi 214122, China. Electronic address: mxzhao@jiangnan.edu.cn.
³ School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China; Jiangsu Collaborative Innovation Center of Water Treatment Technology ＆ Material, Suzhou 215009, China.

PMID: 36309178
DOI: 10.1016/j.biortech.2022.128200

Abstract

In this study, a new process for producing chloride-free snow-melting agents (CSAs) was proposed. Organic wastewater was converted to total volatile fatty acids (TVFA) by anaerobic acidogenic fermentation. The experiments for acid generation showed that the maximum TVFA concentration of 45.9 g/L was obtained at an organic loading rate of 5 g chemical oxygen demand /(L·d), and the proportion of acetic acid reached 78.8 %. Forward osmosis was used for concentrating the TVFA solution. The obtained CSAs, after evaporation and crystallization, had a better ice-melting capacity and less corrosion on metal and concrete than NaCl and CaCl₂. Additionally, the damage caused by CSAs to the germination of plant seeds was significantly lesser than that caused by chloride salts. This study proposed a feasible method for the high-value conversion of organic wastewater, providing a new direction for the reuse of organic wastewater.

Keywords: Anaerobic fermentation; Deicing salt; Forward osmosis concentration; Resource utilization; Volatile fatty acids.

MeSH terms

Acids
Anaerobiosis
Chlorides*
Fatty Acids, Volatile
Fermentation
Snow
Wastewater*

Substances

Waste Water
Chlorides
Fatty Acids, Volatile
Acids