of spent mushroom substrate and waste paper briquette on methane production
from anaerobic digestion
P. and? Arul Mozhi Selvan V.*
Mechanical Engineering, National Institute of Technology, Tiruchirappalli ?
620 015, India
Author E-mail: email@example.com
Spent mushroom substrate
Paper received : 08.09.2016
Revised received : 13.04.2017
Re-revised received :
Accepted : 29.09.2017
Aim: The objective of
the study was to assess the methane yield of briquettes prepared from spent
mushroom substrate and waste paper mixed in equal proportion.
mushroom substrate after cultivation of Pleurotus florida on rice
straw and waste paper was milled to less than 5 mm size. They were briquetted
in equal mass proportion in a screw type machine. Briquette and individual
substrates were assessed for their methane potential under anaerobic
conditions in 125 ml bottles incubated at 37?C for 60 days. Data
was statistically analyzed using analysis of variance.? Dunnett's post hoc
test was used to assess the significance (P < 0.05).
waste paper was co-digested with spent mushroom substrate as powder, methane
yield of 168 ml CH4 g-1 VS was observed. When spent
mushroom substrate - waste paper as briquette was used, highest methane yield
of 250 ml CH4 g-1 VS was observed. Size reduction in
briquetting process made the cellulose and other components of plant cell
walls more accessible to the microorganisms. SEM and FT-IR studies confirmed
the impact of briquetting as a pretreatment step. Volatile fatty acid (VFA)
to alkalinity ratio was observed as 0.26 at the end of digestion of
briquettes, which confirmed the process stability.? ?
yield from anaerobic digestion process was found to be enhanced by
briquetting of spent mushroom substrate and waste paper
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