Performance and kinetic model of a single-stage anaerobic digestion system operated at different successive operating stages for the treatment of food waste

Sagor Kumar Pramanik, Fatihah Suja`, Mojtaba Porhemmat, Biplob Kumar Pramanik

Research output: Contribution to journalArticle

Abstract

A large quantity of food waste (FW) is generated annually across the world and results in environmental pollution and degradation. This study investigated the performance of a 160 L anaerobic biofilm single-stage reactor in treating FW. The reactor was operated at different hydraulic retention times (HRTs) of 124, 62, and 35 days under mesophilic conditions. The maximum biogas and methane yield achieved was 0.934 L/g VSadded and 0.607 L CH4/g VSadded, respectively, at an HRT of 124 days. When HRT decreased to 62 days, the volatile fatty acid (VFA) and ammonia accumulation increased rapidly whereas pH, methane yield, and biogas yield decreased continuously. The decline in biogas production was likely due to shock loading, which resulted in scum accumulation in the reactor. A negative correlation between biogas yield and volatile solid (VS) removal efficiency was also observed, owing to the floating scum carrying and urging the sludge toward the upper portion of the reactor. The highest VS (79%) and chemical oxygen demand (COD) removal efficiency (80%) were achieved at an HRT of 35 days. Three kinetic models-the first-order kinetic model, the modified Gompertz model, and the logistic function model-were used to fit the cumulative biogas production experimental data. The kinetic study showed that the modified Gompertz model had the best fit with the experimental data out of the three models. This study demonstrates that the stability and performance of the anaerobic digestion (AD) process, namely biogas production rate, methane yield, intermediate metabolism, and removal efficiency, were significantly affected by HRTs.

Original languageEnglish
Article number600
JournalProcesses
Volume7
Issue number9
DOIs
Publication statusPublished - 1 Sep 2019

Fingerprint

Anaerobic digestion
Biofuels
Biogas
Hydraulics
Kinetics
Methane
Volatile fatty acids
Volatile Fatty Acids
Chemical oxygen demand
Biofilms
Ammonia
Metabolism
Logistics
Pollution
Degradation

Keywords

  • Anaerobic biofilm reactor
  • Biogas
  • Food waste
  • Hydraulic retention time
  • Kinetic model
  • Kinetic study
  • Process stability and performance

ASJC Scopus subject areas

  • Bioengineering
  • Chemical Engineering (miscellaneous)
  • Process Chemistry and Technology

Cite this

Performance and kinetic model of a single-stage anaerobic digestion system operated at different successive operating stages for the treatment of food waste. / Pramanik, Sagor Kumar; Suja`, Fatihah; Porhemmat, Mojtaba; Pramanik, Biplob Kumar.

In: Processes, Vol. 7, No. 9, 600, 01.09.2019.

Research output: Contribution to journalArticle

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