Increasing the loading rate of continuous stirred tank reactor for coffee husk and pulp : Effect of trace elements supplement

© 2018 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim..

In this study, the anaerobic performance and stability of coffee husk and pulp with and without trace element (TE) supplement was investigated, using 20 L mesophilic continuous stirred tank reactors for 140 days of experiment (DOE). The TE was cocktail of trace metals composed of Fe, Ni, Zn, Co, Mn, Mo, Se W and B. The organic loading rate (OLR) was increased stepwise from 2.5 (HRT = 40 d) to 6.0 kg VS m-3 d- 1(HRT = 16.7 d). The highest methane productivity from pulp with and without TE was 1.272 and 0.965 m3 m-3 d-1 at an OLR of 6.0 and 5.0 kg VS m-3 d-1; while the husks performed 0.895 and 0.795 m3 m-3 d-1 respectively, both at an OLR of 6.0 kg VS m-3 d-1. The specific methane yield (SMY) of pulp (at OLR = 5 kg VS m-3 d-1) with and without TEs was 217.9 ± 4.7 and 193.1 ± 8.2 L kg-1 VS; while husk yielded 149.2 ± 6.0 and 132.5 ± 4.9 L kg-1 VS, respectively. The effect of TEs on SMY was statistically significant (p < 001) at higher OLRs (5.0 - 6.0 kg VS m-3 d-1). The TEs improved the anaerobic stability through an optimum alkalinity ratio (VFA/TIC < 0.3) and suppressed the accumulation of volatile fatty acids. Mono digestion of husks and pulp are prone to lack Mo, Zn, Ni and Fe in long-term anaerobic fermentation. Further studies on co-digestion of husk/pulp with animal manure and dry fermentation helps to efficiently use this biomass resource.

Medienart:

E-Artikel

Erscheinungsjahr:

2018

Erschienen:

2018

Enthalten in:

Zur Gesamtaufnahme - volume:18

Enthalten in:

Engineering in life sciences - 18(2018), 8 vom: 07. Aug., Seite 551-561

Sprache:

Englisch

Beteiligte Personen:

Chala, Bilhate [VerfasserIn]
Oechsner, Hans [VerfasserIn]
Fritz, Thomas [VerfasserIn]
Latif, Sajid [VerfasserIn]
Müller, Joachim [VerfasserIn]

Links:

Volltext

Themen:

Biogas
Coffee husk
Coffee pulp
Journal Article
Trace element
VFA/TIC

Anmerkungen:

Date Revised 28.09.2020

published: Electronic-eCollection

Citation Status PubMed-not-MEDLINE

doi:

10.1002/elsc.201700168

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM312026323