Feasibility and mechanism of recycling carbon resources from waste cyanobacteria and reducing microcystin toxicity by dielectric barrier discharge plasma

Jie Wang; Guofeng Cheng; Jiahua Zhang; Yuyi Shangguan; Ming Lu; Xingguo Liu

doi:10.1016/j.jhazmat.2023.132333

Feasibility and mechanism of recycling carbon resources from waste cyanobacteria and reducing microcystin toxicity by dielectric barrier discharge plasma

J Hazard Mater. 2023 Oct 15:460:132333. doi: 10.1016/j.jhazmat.2023.132333. Epub 2023 Aug 23.

Authors

Jie Wang¹, Guofeng Cheng¹, Jiahua Zhang¹, Yuyi Shangguan², Ming Lu³, Xingguo Liu⁴

Affiliations

¹ Fishery Machinery and Instrument Research Institute of Chinese Academy of Fishery Sciences, 63 Chifeng Road, Shanghai 200092, China; Key Laboratory of Aquaculture Facilities Engineering, Ministry of Agriculture and Rural Affairs, 63 Chifeng Road, Shanghai 200092, China.
² Shanghai Key Lab for Urban Ecological Processes and Eco-Restoration, East China Normal University, 500 Dongchuan Road, Shanghai 200241, China.
³ School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Road, Shanghai 200093, China.
⁴ Fishery Machinery and Instrument Research Institute of Chinese Academy of Fishery Sciences, 63 Chifeng Road, Shanghai 200092, China; Key Laboratory of Aquaculture Facilities Engineering, Ministry of Agriculture and Rural Affairs, 63 Chifeng Road, Shanghai 200092, China. Electronic address: liuxingguo@fmiri.ac.cn.

PMID: 37634378
DOI: 10.1016/j.jhazmat.2023.132333

Abstract

Recycling carbon resources from discarded cyanobacteria is a worthwhile research topic. This study focuses on the use of dielectric barrier discharge (DBD) plasma technology as a pretreatment for anaerobic fermentation of cyanobacteria. The DBD group (58.5 W, 45 min) accumulated the most short chain fatty acids (SCFAs) along with acetate, which were 3.0 and 3.3 times higher than the control. The DBD oxidation system can effectively collapse cyanobacteria extracellular polymer substances and cellular structure, improve the biodegradability of dissolved organic matter, enrich microorganisms produced by hydrolysis and SCFAs, reduce the abundance of SCFAs consumers, thereby promoting the accumulation of SCFAs and accelerating the fermentation process. The microcystin-LR removal rate of 39.8% was obtained in DBD group (58.5 W, 45 min) on day 6 of anaerobic fermentation. The toxicity analysis using the ECOSAR program showed that compared to microcystin-LR, the toxicity of degradation intermediates was reduced. The contribution order of functional active substances to cyanobacteria cracking was obtained as e_aq^- > •OH > ¹O₂ > •O₂^- > ONOO^-, while the contribution order to microcystin-LR degradation was e_aq^- > •OH > •O₂^- > ¹O₂ > ONOO^-. DBD has the potential to be a revolutionary pretreatment method for cyanobacteria anaerobic fermentation.

Keywords: Advanced oxidation technology; Anaerobic fermentation; Plasma technology; Reactive oxygen species (ROS); Short-chain fatty acids (SCFAs).

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Body Fluids*
Carbon
Cyanobacteria*
Feasibility Studies
Microcystins

Substances

Microcystins
Carbon