4.4 Article

Co-composting of forest and industrial wastes watered with pig manure

Journal

ENVIRONMENTAL TECHNOLOGY
Volume 42, Issue 5, Pages 705-716

Publisher

TAYLOR & FRANCIS LTD
DOI: 10.1080/09593330.2019.1643411

Keywords

Forest green waste; MDF sludge; co-composting; compaction

Funding

  1. Xunta de Galicia - Boibel Forestal S.L. [FEADER 2015/38]

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The addition of pig manure improved water content and carbon to nitrogen ratio in composting, while compaction and the addition of industrial sludge were necessary for stable compost. Proper control of thermophilic temperatures and matrix size can lead to desirable composting outcomes.
Co-composting of forest-derived wastes (chestnut forest burr, CST; scrubland biomass, SRB; industrial sludge, MDFS, from the Medium Density Fibreboard production process) watered with pig manure (PM) may constitute a feasible management technique for both solid and liquid streams. PM provided water and improved the carbon to nitrogen (C/N) ratio. Four piles of 1.8-2.4 m(3) were conformed: A (SRB, with compaction bulk density), B (SRB, without compaction), C (SRB and MDFS at a volumetric ratio of 3:1) and D (CST). Thermophilic temperatures were maintained for 8 (B), 16 (A), 28 (C) and 40 (D) days. Stable compost was obtained after 35 (A, B, C) and 48 (D) days. Hygienization was only complete in piles C and D. N losses were higher in piles A (39.3%) and B (33.6%) in relation to C (17.0%) and D (8.9%) which could be attributed to the characteristics of MDFS and CST. Increasing the matrix size from 340 L to around 2000 L led to a higher intensity of the thermophilic phase. Besides, compaction significantly increased the temperature during composting. PM was added at ratios ranging from 1.8 to 2.5 L/kg dry matter, being favoured by pre-drying of solid wastes. [GRAPHICS] .

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