Effects of pretreatments on the production of biogas from cow manure

Year 2018, Volume: 2 Issue: 1, 48 - 52, 15.04.2018

Esin Hande Bayrak Işık , Fatih Polat

Abstract

In this study, some pretreatments were applied to cow manure to
determine water solubility and biogas production. Aqueous phases containing 10
% solids by mass were prepared in the study. Chemical substances (NaOH), which
were as much as 10, 15, and 20 % of the solids by mass, were added to the
aqueous phases, and then they were subjected to microwave and hotplate thermal
pretreatments separately (for 15, 30, 60 minutes). Following the pretreatments,
the water solubility percentages of the solid materials were determined in the
un-pretreated and pretreated aqueous phases. The pH of the aqueous phases,
which yielded the highest water solubility, was adjusted to 7 using acid.
Afterwards, the aqueous phases were incubated at 35 °C for 32 days in an
incubator, and biogas and methane measurements were made in aqueous phases
every 4 days. As a result of the study, maximum water solubility was found to
be 92.8% (by mass), maximum biogas yield 378 mL/1g, and dry solids and maximum
methane content values 41%.  

Keywords

Biogas, Cow manure, Pretreatments, Water solubility

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