Analysis of heavy metals in the conversion of lake sediment and restaurant waste by black soldier fly (Hermetia illucens)

Frontiers in Bioengineering and Biotechnology

Bioengineering and Biotechnology

Xiaopeng Xiao¹  Hanlin Wang²  Wu Li²  Longyuan Yang²  Xianli Liu²  Zhongwen Wang³  Xiangyi Gong⁴  Caixi Hu⁴ 

[1] Changsha Zoomlion Environmental Industry Co., Ltd., Changsha, China;Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation, School of Environmental Science and Engineering, Hubei Polytechnic University, Huangshi, China;Hubei Provincial Key Lab for Quality and Safety of Traditional Chinese Medicine Health Food, Jing Brand Chizhengtang Pharmaceutical Co., Ltd., Huangshi, China;School of Resources and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, China;

关键词: black soldier fly;    lake sediment;    restaurant waste;    heavy metal;    utilization;   

DOI  :  10.3389/fbioe.2023.1163057

 received in 2023-02-10, accepted in 2023-03-13,  发布年份 2023

来源: Frontiers

【 摘 要 】

The risk posed by heavy metals makes it difficult to dispose of sediment contaminants from dredging lakes in China. Black soldier fly (Hermetia illucens) can convert organic waste, such as restaurant waste and lake sediment, to high-value-added protein feed and fertilizer. Experimental groups were formed in this study to explore the conversion of heavy metals present in the mixture of restaurant waste and lake sediment by black soldier fly larvae (BSFL). The results demonstrated that BSFL could survive in pure sediment with an 84.76% survival rate. Relative to the substrate, BSFL could accumulate 70-90% zinc (Zn), chromium (Cr), copper (Cu), and 20-40% cadmium (Cd) and lead (Pb). The experimental group 2:3, with 40% lake sediment and 60% restaurant waste, was the best group after conversion for 15 days, which showed a 95.24% survival rate of BFSL, 82.20 mg average weight of BFSL, 8.92 mm average length of BFSL, with varying content of heavy metals such as Cu (43.22 mg/kg), Zn (193.31 mg/kg), Cd (1.58 mg/kg), Cr (25.30 mg/kg) Cr, and Pb (38.59 mg/kg) in BSFL. Furthermore, the conversion residue conforms to the relevant standards of organic fertilizer in China and can be used as organic fertilizer. Overall, the present study shows that black soldier flies can improve the resource utilization of lake sediment, especially by reducing the effect of heavy metals.

【 授权许可】

Unknown   
Copyright © 2023 Hu, Yang, Wang, Xiao, Wang, Gong, Liu and Li.