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Title: Protein recovery from sludge: a review
Authors: Xiao, Keke
Zhou, Yan
Keywords: Engineering::Environmental engineering
Issue Date: 2020
Source: Xiao, K. & Zhou, Y. (2020). Protein recovery from sludge: a review. Journal of Cleaner Production, 249, 119373-.
Journal: Journal of Cleaner Production
Abstract: Protein recovery from sludge is a simple and well-studied waste-to-resource approach to convert the “wasted” sludge to useful “product”. This article reviews different pretreatment methods to accelerate the release/solubilization of protein from sludge, including physical, thermal, chemical, biological options, and their combinations. Based upon the papers reviewed, protein release/solubilization from sludge was found to be the determining step prior to recovery. The alkaline pretreatment at pH 12 was the most effective method for protein solubilization when compared with ultrasonic (1 W mL−1) and thermal (80 °C) pretreatments, if only considering the released protein concentration. Moreover, pretreatments can change protein properties (e.g., molecular weight, conformation, type, etc.), and the details were summarized. The recovered protein can be alternatives for poultry feedstuff, wood adhesive and fire-extinguishing foam, and its separation from sludge liquor can considerably reduce the nitrogen load to the wastewater treatment plant and the environment. Finally, the integration of circular economy into protein recovery from sludge was proposed, and the related system boundaries for life cycle assessment of this technology were defined. Future research should focus on promoting its full-scale implementation by tackling with the technical, economic, social, and environmental challenges.
ISSN: 0959-6526
DOI: 10.1016/j.jclepro.2019.119373
Schools: School of Civil and Environmental Engineering 
Research Centres: Nanyang Environment and Water Research Institute 
Advanced Environmental Biotechnology Centre (AEBC) 
Rights: © 2019 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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