We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Impact of heavy metals, microplastics, and food pathogens on black soldier fly larvae
Summary
Researchers fed black soldier fly larvae substrates contaminated with heavy metals, microplastics, and food pathogens to evaluate tolerance and bioconversion efficiency, finding that certain contaminants reduced larval performance and bioconversion rates with implications for insect-based waste recycling.
The larvae of the Black Soldier Fly (BSF), Hermetia illucens, are efficient decomposers of waste streams thanks to their ability to grow and develop on a wide variety of decaying substrates, even those highly contaminated by various xenobiotics. In particular, certain contaminants could potentially reduce the efficiency of the insect-mediated bioconversion process, but also have an impact on the larvae, thus affecting the quality of the final insect biomass. To investigate this aspect, BSF larvae were reared on a feeding substrate contaminated with different concentrations of lead, PET microparticles, or Staphylococcus aureus, to assess the effects of heavy metals (HMs), microplastics (MPs), or pathogens, respectively, on various larval biological parameters. The three xenobiotics differentially affected insect physiology, indicating the ability of BSF larvae to manage specific contaminants depending on their nature. In particular, HM exposure had a significant impact on the larvae, affecting not only larval growth and survival rate, but also stimulating their immune system. Moreover, a complete elimination of the tested xenobiotics was observed only for food pathogens, confirming the recalcitrant nature of HMs and MPs as a factor that must be carefully taken into consideration, especially when the final insect biomass is used as animal feed ingredient or frass is utilized as fertilizer. This study highlights the complex interactions between BSF larvae and specific environmental contaminants, providing insights into their effects on larval biology and potential implications for bioconversion efficiency. In particular, the ability of BSF larvae to eliminate foodborne pathogens suggests a promising role in waste sanitation, whereas the accumulation of heavy metals in the larvae and/or in the substrate raises concerns about the safety of the resulting insect biomass and frass. These findings emphasize the need for further research to develop entomo-remediation strategies and assess the implications of xenobiotic contamination in large-scale applications.
Sign in to start a discussion.
More Papers Like This
Trace metal elements and microplastics ingestion during biowaste recycling by black soldier larvae
Researchers examined the ingestion of trace metal elements and microplastics by black soldier fly larvae during biowaste recycling, assessing whether this valorization pathway introduces contaminant risks into the insect biomass and resulting frass.
Effects of microplastics and salinity on food waste processing by black soldier fly (Hermetia illucens) larvae
Researchers investigated how microplastics and salinity levels affect the ability of black soldier fly larvae (Hermetia illucens) to process food waste, finding that both factors can negatively influence larval growth, survival, and food waste degradation efficiency. The results highlight challenges for using this insect as a bioconversion tool in contaminated or coastal waste streams.
Toxicity and bioconversion: Meta-analytical insights into microplastic effects on black soldier fly rearing
This meta-analysis found that microplastics in organic waste can reduce black soldier fly larval growth and survival, though larvae demonstrated some capacity to biodegrade certain plastic polymers. The findings are important because black soldier fly larvae are increasingly used for sustainable waste processing, and microplastic contamination in waste streams could compromise this approach.
Plastic Particle Contamination in Substrate and Frass of Black Soldier Fly Larvae Cultivation in Community Solid Waste Recycling Centers
Researchers investigated plastic particle contamination in black soldier fly larvae (BSFL) bioconversion systems at two community solid waste recycling centers in Surabaya, Indonesia, finding that insufficient waste segregation led to plastic particles entering BSFL substrates and frass. The study found that 74 percent of solid waste at one center was suitable for BSFL substrate versus only 37 percent at the other, highlighting how plastic contamination in insect bioconversion could introduce microplastics into the food chain via larvae-derived products.
Exposure of black soldier fly larvae to microplastics of various sizes and shapes: Ingestion and egestion dynamics and kinetics
Researchers studied how black soldier fly larvae, used to convert food waste into animal feed, interact with microplastics of different sizes and shapes. The larvae ingested microplastics along with their food but could not fully break them down, passing most of them through in their waste. This raises food safety concerns because if microplastics persist in the larvae, they could transfer up the food chain when the larvae are used as feed for livestock or fish.