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Increasing native microbiota in lignocellulosic waste composting: Effects on process efficiency and final product maturity

Paper ID Volume ID Publish Year Pages File Format Full-Text
34456 45026 1969 12 PDF Available
Title
Increasing native microbiota in lignocellulosic waste composting: Effects on process efficiency and final product maturity
Abstract

•Microbial inoculation modified the initial biodiversity of the compost piles.•Bio-inoculation favored a quicker degradation of the easily biodegradable fractions.•Microbial augmentation activated the nitrification process.•Biodegradation process was continuous and accelerated during the first 2 weeks.•Inoculation was found useful to enhance the lignocellulosic waste-based composting.

Intensive agriculture produces more than one million tons of organic waste mainly composed of lignocellulosic compounds. Though some management strategies have been lately adopted, many problems related to time and surface required for a proper treatment and final product quality remain unsolved. In this work, a staggered bioaugmentation process is proposed for the improvement of horticultural waste composting. Inocula were composed of 30 microbial strains previously isolated from identical composting piles, operated under the same conditions used in this work. The high levels of biomass carbon at the beginning of the bio-oxidative phase and the parallel evolution of reducing sugars reflected a quick adaptation of microbial inocula to the high temperatures reached during the process. Reducing sugar content during the process in the uninoculated pile was below 200 μg g−1, while a higher content was detected in the inoculated pile (2500 μg g−1). Hemicellulose degraded at the end of the process in the inoculated pile was near to 85% whereas in the control pile was below 70%. Lignin degradation ratio was also higher in the inoculated pile (41% in comparison to 23% in the control pile). Moreover, several stabilization and humification indices supported that the bio-inoculation procedure here reported yields better quality products, earlier stabilized, from processes in which lignocellulosic carbon is more efficiently biotransformed.

Keywords
Bioaugmentation; Biomass; Microbial inocula; Composting; Maturity indices; Agricultural waste
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Increasing native microbiota in lignocellulosic waste composting: Effects on process efficiency and final product maturity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 49, Issue 11, November 2014, Pages 1958–1969
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us