Downstream Augmentation of Hydrothermal Carbonization with Anaerobic Digestion for

Integrated Biogas and Hydrochar Production from the Organic Fraction of Municipal

Solid Waste: A Circular Economy Concept

Hari Bhakta Sharmaa, Sagarika Panigrahia,Ajit K. Sarmahb Brajesh K. Dubeya*

a Department of Civil Engineering, Indian Institute of Technology - Kharagpur, Kharagpur, West Bengal 721302, India

bDepartment of Civil & Environmental Engineering, Faulty of Engineering, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand

*Corresponding author: +91-3222- 282874; Fax: +91-3222-282254

E-mail:bkdubey@civil.iitkgp.ac.in

SupplementaryTable A.1

pH STD SCOD (mg/L) STD

UTY 7.2 0.1 2548 40.00

PTY 6.9 0.1 2312 78.61

H -180-T- 6 5.28 0.1 14222.22 3972.72

H -180- U-6 5.28 0.1 16640 954.20

H -200 -U -6 5.27 0.1 17066.66 78.65

H - 200-T-6 5.27 0.1 16640 2781.10

Fig. S1. Schematic representation of the batch anaerobic digestion set up (Schematic

taken from our previous study (Panigrahi et al., 2019))

Fig. S2. XRD peaks of digestate and hydrochar samples

Fig. S3. SEM images of hydrochar: (1): H-180-U-6; (2) H-180-P-6; (3) H-200-U-6; (4) H-200-P-6

Fig. S4. Tangent intersection method to find combustion parameter(Shown here as example is

Ti , Tf and Tm points for UTY )

Reference

Panigrahi, S., Sharma, H.B., Dubey, B.K., 2019. Anaerobic co-digestion of food waste with

pretreated yard waste: A comparative study of methane production, kinetic modeling and

energy balance. J. Clean. Prod. 118480.