EFFECT OF D-LIMONENE ON PRODUCTION OF METHANE FROM STARCH AND XYLAN USING MEMBRANE BIOREACTOR

FATHYAH HANUM P, Dr. Ria Millati, S.T.,M.T.; Dr.Ir. M. Nur Cahyanto, M.Sc.; Prof. Claes Niklasson

2015 | Skripsi | S1 TEKNOLOGI PANGAN DAN HASIL PERTANIAN

-

Methane is a potential renewable energy source which can be produced through the anaerobic digestion of biomass such as food waste. However, the presence of active compounds like D-limonene in food waste may inhibit methane production. In this work, configuration of PVDF MBR (polyvinylidene fluoride membrane bioreactor) in which preheated free cells and encapsulated unheated cells work simultaneously in a single reactor, was tested for methane production from starch, xylan, and citrus peel in a batch operation. The unheated thermophilic cells (3 g) were encased and sealed in 3 × 6 cm polyvinylidene fluoride (PVDF) membranes with a pore size of 0.1μm, and were then placed in batch reactors containing basal medium and starch or xylan (with and without D-limonene) or citrus peel as a carbon source. Methane yields, hydrogen yields and pH values were measured. The MBR enhanced the cell tolerance against 5 g/L of the inhibitor D-limonene in the starch medium (the methane yield was 802.03x10-3 Nm3/g VS). However in the xylan medium containing 5 g/L of D-limonene, the methane yield of the MBR was statistically the same as the free cell system (methane yield was 727.10x10-3 Nm3/g VS). Although membrane encasement of cells can protect the cells from D-limonene, nutrient mass transfer is crucial in the application of an MBR. The MBR provided a higher methane yield from citrus peel waste with substrate to inoculum ratios of both 1:2 (methane yield 24.98x10-3 Nm3/g VS) and 1:4 (methane yield 82.53x10-3 Nm3/g VS) compared with the free cell system.

Kata Kunci : Anaerobic digestion, methane, biogas, synthetic membrane, cell containment, limonene