Semi-continuous anaerobic co-digestion of sugar beet byproduct and pig manure: Effect of the organic loading rate (OLR) on process performance.

Semi-continuous anaerobic co-digestion of sugar beet byproduct and pig manure: Effect of the organic loading rate (OLR) on process performance.

Bioresource technology (2015-07-27)

Kaoutar Aboudi, Carlos José Álvarez-Gallego, Luis Isidoro Romero-García

ABSTRACT

Anaerobic co-digestion of dried pellet of exhausted sugar beet cossettes (ESBC-DP) with pig manure (PM) was investigated in a semi-continuous stirred tank reactor (SSTR) under mesophilic conditions. Seven hydraulic retention times (HRT) from 20 to 5 days were tested with the aim to evaluate the methane productivities and volatile solids (VS) removal. The corresponding organic loading rates (OLR) ranged from 4.2 to 12.8 gVS/L(reactor) d. The findings revealed that highest system efficiency was achieved at an OLR of 11.2 gVS/L(reactor) d (6 days-HRT) with a methane production rate (MPR) and volatile solids (VS) reduction of 2.91 LCH4/L(reactor) d and 57.5%, respectively. The HRT of 5 days was found critical for the studied process, which leads to volatile fatty acids (VFA) accumulation and sharp drop in pH. However, the increase of HRT permits the recovery of system.

MATERIALS

Product Number

Brand

Product Description

702102

Sigma-Aldrich

Carbon, mesoporous

699640

Sigma-Aldrich

Carbon, mesoporous, less than 100 ppm Al, Ti, Fe, Ni, Cu, and Zn combined

699624

Sigma-Aldrich

Carbon, mesoporous, nanopowder, graphitized, less than 250 ppm Al, Ti, Fe, Ni, Cu, and Zn combined

699632

Sigma-Aldrich

Carbon, mesoporous, nanopowder, less than 500 ppm Al, Ti, Fe, Ni, Cu, and Zn combined

702110

Sigma-Aldrich

Carbon, mesoporous, hydrophilic pore surface

719811

Sigma-Aldrich

Carbon nanofibers, pyrolitically stripped, platelets(conical), >98% carbon basis, D × L 100 nm × 20-200 μm

719803

Sigma-Aldrich

Carbon nanofibers, graphitized, platelets(conical), >98% carbon basis, D × L 100 nm × 20-200 μm

490210

Sigma-Aldrich

Methane-¹²C, ¹³C-depleted, 99.9 atom % ¹²C

GF91785134

Carbon - Vitreous, rod, 200mm, diameter 10mm, glassy carbon

GF20176680

Carbon - Vitreous, rod, 5mm, diameter 3.0mm, glassy carbon

GF04031132

Carbon - Vitreous, foam, 300x300mm, thickness 20mm, bulk density 0.05g/cm³, porosity 96.5%

GF65427587

Carbon - Vitreous, rod, 100mm, diameter 3.0mm, glassy carbon

GF59400233

Carbon - Vitreous, tube, 100mm, outside diameter 10mm, inside diameter 3mm, wall thickness 3.5mm, glassy carbon

GF89520521

Carbon - Vitreous, foil, 25x25mm, thickness 4.0mm, glassy carbon

GF05962765

Carbon - Vitreous, rod, 100mm, diameter 5.0mm, glassy carbon

GF06230922

Carbon - Vitreous, foam, 300x300mm, thickness 30mm, bulk density 0.05g/cm³, porosity 96.5%

GF10355958

Carbon - Vitreous, foil, 25x25mm, thickness 0.5mm, glassy carbon

GF39088648

Carbon - Vitreous, tube, 50mm, outside diameter 10mm, inside diameter 3mm, wall thickness 3.5mm, glassy carbon

GF96762864

Carbon - Vitreous, foil, 50x50mm, thickness 1.0mm, glassy carbon

GF68195403

Carbon - Vitreous, rod, 100mm, diameter 7.0mm, glassy carbon

GF95357526

Carbon - Vitreous, foil, 100x100mm, thickness 1.0mm, glassy carbon

GF23723423

Carbon - Vitreous, rod, 200mm, diameter 1.0mm, glassy carbon

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Carbon - Vitreous, foil, 100x100mm, thickness 6.0mm, glassy carbon

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Carbon - Vitreous, foil, 50x50mm, thickness 4.0mm, glassy carbon

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Carbon - Vitreous, foil, 100x100mm, thickness 2.0mm, glassy carbon

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Carbon - Vitreous, rod, 200mm, diameter 3.0mm, glassy carbon

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Carbon - Vitreous, foil, 10x10mm, thickness 1.0mm, glassy carbon

GF39873369

Carbon - Vitreous, foam, 150x150mm, thickness 3.2mm, bulk density 0.05g/cm³, porosity 96.5%

GF45345562

Carbon - Vitreous, rod, 200mm, diameter 5.0mm, glassy carbon

GF07378476

Carbon - Vitreous, foam, 150x150mm, thickness 2.5mm, bulk density 0.05g/cm³, porosity 96.5%