Biological Pretreatment Effects on the Bioconversion of Brewer Spent Grain with Hermetia illucens Larvae

IF 4.6 Q2 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Recycling Pub Date : 2022-12-27 DOI:10.3390/recycling8010003

M. Sumba-Zhongor, E. Álava, L. Galarza, Johana Ortíz-Ulloa, E. Chica, O. Ruiz-Barzola, Julia Nieto-Wigby, M. Jimenez-Feijoó, Malena Torres-Ulloa

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Abstract

Hermetia illucens is an important species for waste management and the circular economy. The aim of this study was to analyze the effects of Trichoderma reesei C2A and Pleurotus sp. as pretreatments of brewer spent grain (BSG). BSG was inoculated with fungal solution or distilled water (control). After seven days, this was used for H. illucens larvae cultivation. At the end of bioconversion process, parameters of substrate reduction and H. illucens larval development were evaluated. Chemical properties of BSG, frass and larvae were also analyzed. With T. reesei C2A pretreatment, highest substrate reduction (46.3 ± 0.9%) was achieved, but larval growth rate was lower (1.0 ± 0.1 mg/d) than that of control (2.8 ± 0.2 mg/d). Larvae of Pleurotus sp. pretreatment had limited development, reflected in their negative growth rate (−0.6 ± 0.2 mg/d). In conclusion, cultivation of H. illucens larvae (six day old) on BSG pretreated with Pleurotus sp. is not recommended. On the other hand, T. reesei C2A pretreatment enhance BSG reduction, and its potential use for lignocellulosic waste management should be more explored.

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生物预处理对啤酒糟生物转化的影响

黑草是废物管理和循环经济的重要物种。研究了里氏木霉(Trichoderma reesei C2A)和侧耳菇(Pleurotus sp.)作为啤酒废粮预处理的效果。用真菌液或蒸馏水(对照)接种BSG。7天后，将其用于淡纹夜蛾幼虫的培养。在生物转化过程结束时，对底物还原和绿僵菌幼虫发育参数进行了评价。并分析了其化学性质。经C2A预处理后，底物减量最高(46.3±0.9%)，但幼虫生长速度(1.0±0.1 mg/d)低于对照(2.8±0.2 mg/d)。预处理后平菇幼虫发育受限，表现为负生长速率(- 0.6±0.2 mg/d)。综上所述，不建议在经侧耳菇预处理的BSG上培养6日龄的黄芽孢杆菌幼虫。另一方面，T. reesei C2A预处理提高了BSG的还原效果，其在木质纤维素废弃物管理中的潜在应用值得进一步探索。

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