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Bio-sludge from the pulp and paper industry as feed for black soldier fly larvae: A study of critical factors for growth and survival
Mid Sweden University, Faculty of Science, Technology and Media, Department of Ecotechnology and Suistainable Building Engineering. Ragn-Sells AB, Timrå, Sweden.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Ecotechnology and Suistainable Building Engineering.ORCID iD: 0000-0002-3204-4089
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.ORCID iD: 0000-0001-6983-3121
2019 (English)In: Waste and Biomass Valorization, ISSN 1877-2641, E-ISSN 1877-265XArticle in journal (Refereed) Epub ahead of print
Abstract [en]

Pulp and paper bio-sludge (PPBS) has low economic value and is therefore often composted or incinerated. The purpose of this work is to evaluate the feasibility of using PPBS to breed black soldier fly (Hermetia illucens) larvae (BSFL), so improving resource efficiency and supplying protein and fat to the animal feed market. BSFL were reared on PPBS in a climate chamber on a laboratory scale in order to assess nutrient deficiency, inhibition and whether the BSFL recycle the PPBS well or not. The PPBS used came from a chemi-thermomechanical pulp/groundwood pulp mill. The effect of supplementing nutrient solution added either into the PPBS or as a free liquid surface were studied. Prepupae dry weight, survival rate until prepupae stage and residual dry PPBS were measured. The addition of reference diet leachate into the PPBS did not have a significant impact on the weight of the prepupae (2.0 mg) but the survival rate was significantly higher (16.0 %). On the other hand, the addition of reference diet leachate as a free liquid surface had a significant impact on both the weight of the prepupae (4.8 mg) and the survival rate (25.7 %). The bio – conversion and PPBS – reduction was as best 0.4 % and 3.2 % respectively. This study has proven that the nutrients in PPBS are not readily available to the larvae. Addition of reference diet leachate increase the survival rate which opens up for possibilities of co-digestion. However, it is clear that under the tested conditions, BSFL is not recycling PPBS well and BSFL as a method for recycling of PPBS need further research.

Place, publisher, year, edition, pages
2019.
Keywords [en]
Pulp and paper bio-sludges, Valorization, Black Soldier Fly larvae
National Category
Environmental Sciences Environmental Engineering
Identifiers
URN: urn:nbn:se:miun:diva-37565DOI: 10.1007/s12649-019-00864-xOAI: oai:DiVA.org:miun-37565DiVA, id: diva2:1364833
Funder
Knowledge FoundationAvailable from: 2019-10-22 Created: 2019-10-22 Last updated: 2019-11-07

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Norgren, RobertJonsson, AndersBjörkqvist, Olof
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