期刊
WASTE MANAGEMENT
卷 161, 期 -, 页码 92-103出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2023.02.029
关键词
Biorefinery; Biowaste; Biopesticide; Enzymatic hydrolysis; Solid-state fermentation
Alternative production processes using waste are necessary for resource conservation and preventing material scarcity. This study proposes a method of valorizing the residual solid fraction from enzymatic hydrolysis of biowaste using solid-state fermentation. Two digestates from anaerobic digestion processes were used as cosubstrates to modify the pH and promote bacterial growth. The final product contained spores and crystal proteins with insecticidal activity, allowing for the sustainable use of all materials liberated during the enzymatic hydrolysis.
Alternative production processes using waste are necessary to preserve non-renewable resources and prevent scarcity of materials for future generations. Biowaste, the organic fraction of municipal solid waste, is abundant and easily available. It can be fractionated into building blocks for which fermentative processes can be designed. By using solid-state fermentation, this paper proposes a method of valorizing biowaste's residual solid fraction after enzymatic hydrolysis. In a 22 L bioreactor, two digestates from anaerobic digestion processes were evaluated as cosubstrates to modify the acidic pH of the solid residue after enzymatic hydrolysis and promote the growth of the bacterial biopesticide producer Bacillus thuringiensis. Regardless of the cosubstrate used, the final microbial populations were similar indicating microbial specialization. The final product contained 4 x 108 spores per gram of dry matter and also crystal proteins of Bacillus thuringiensis var israelensis, which have insecticidal activity against pests. This method allows for the sustainable use of all materials liberated during the enzymatic hydrolysis of biowaste, including residual solids.
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