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. 2017 Oct;7(5):304.
doi: 10.1007/s13205-017-0936-x. Epub 2017 Sep 9.

Enhanced biogas yield by thermo-alkali solubilization followed by co-digestion of intestine waste from slaughterhouse with food waste

S Porselvam  1 , N Soundara Vishal  1 , S V Srinivasan  1
Affiliations

Enhanced biogas yield by thermo-alkali solubilization followed by co-digestion of intestine waste from slaughterhouse with food waste

S Porselvam et al. 3 Biotech. 2017 Oct.

Abstract

Intestine waste generated from slaughterhouse (IWS) is difficult to degrade in anaerobic process due to the presence of high protein and lipid contents. However, anaerobic co-digestion helps to increase the degradation of IWS by the addition of carbon-rich food waste (FW). To increase the biogas yield, thermo-alkali pretreatment may be more viable method for the anaerobic digestion of protein and lipid rich wastes. In the present study, Thermo-alkali pretreatment of intestine waste from slaughterhouse and food waste alone and mixing of IWS and FW with different ratios (1:1-1:3) on VS basis have been studied. To study the effect of Thermo-alkali pretreatment on solubilization of substrate, the substrate was mixed with alkali solutions (NaOH and KOH) at different concentrations of 1, 2, 3, 4 and 5% solutions. The results revealed that the maximum solubilization was observed to be 94.7% and 90.1% at KOH (1:3 and 5%) and NaOH (1:3 and 5%), respectively. Based on the study, enhancement in biogas yield by 16% (IWS), 11.5% (FW), 12.2% (1:1), 18.11% (1:2) and 22.5% (1:3) in KOH pretreated waste when compared with NaOH pretreated waste.

Keywords: Biogas; Food waste; Intestine waste; Slaughterhouse; Solubilization; Thermo-alkali pretreatment.

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Conflict of interest statement

The authors declare that there is no potential conflict of interest.

Figures

Fig. 1
Fig. 1
a Size reduction. b COD solubilization rate on KOH pretreatment of IWS, FW and mixing ratios (1:1, 1:2 and 1:3)
Fig. 2
Fig. 2
a Size reduction. b COD solubilization rate on NaOH pretreatment of IWS, FW and mixing ratios (1:1, 1:2 and 1:3)
Fig. 3
Fig. 3
a Cumulative biogas yield, b biogas yield and VS removal efficiency, c pH, d VFA/alkalinity ratio and e free ammonia concentration in KOH pre-treated anaerobic digestion
Fig. 4
Fig. 4
a Cumulative biogas yield, b biogas yield and VS removal efficiency, c pH, d VFA/alkalinity ratio and e free ammonia concentration in NaOH pre-treated anaerobic digestion
Fig. 5
Fig. 5
a–c Methane content of biogas produced from IWS, FW and 1:2 by gas chromatography
See this image and copyright information in PMC

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