Journal of Chemical Technology & Biotechnology, 2019
BACKGROUND:
Spent mushroom substrate (SMS), largely produced as an agriculture
waste from mushroom cultivation, was transformed into biochar via
microwave vacuum pyrolysis under different ratios of SMS to microwave
absorbent (1:1, 1:2, and 1:3). The biochar was then examined for its
potential to be re-used in mushroom cultivation as a growth medium added
to conventional mushroom bag log (plastic bag with mushroom seeds and
culture substrates containing rice straw, sawdust, lime and water), with
emphasis on its ability to form mycelium – a fungus that grows into
mushroom from its seeds.
RESULT: The pyrolysis generated up to 36 wt% biochar yield with a large adsorption area (up to215m2 g-1) and less water (4 wt%), indicating that many adsorption sites are available on which mushroom seeds, nutrient and water can be adsorbed onto in order to form mycelium (and subsequently mushroom). The biochar added to grow mushroom in bag log recorded a higher water retention percentage (up to 59%), a higher mycelium colonization length in 8 days (6.3 cm), coverage area (up to 259 cm2) and total mycelium growth volume (317 cm3), and resulted in a higher yield of mushroom (200 gmonth-1) than that recorded for the conventional bag log without biochar (160 gmonth-1).
CONCLUSION: The results indicated that biochar produced from SMS using microwave vacuum pyrolysis shows great potential in retaining water and nutrient that in turn promotes the formation of mycelium that leads to increased growth of mushroom in its cultivation.
RESULT: The pyrolysis generated up to 36 wt% biochar yield with a large adsorption area (up to215m2 g-1) and less water (4 wt%), indicating that many adsorption sites are available on which mushroom seeds, nutrient and water can be adsorbed onto in order to form mycelium (and subsequently mushroom). The biochar added to grow mushroom in bag log recorded a higher water retention percentage (up to 59%), a higher mycelium colonization length in 8 days (6.3 cm), coverage area (up to 259 cm2) and total mycelium growth volume (317 cm3), and resulted in a higher yield of mushroom (200 gmonth-1) than that recorded for the conventional bag log without biochar (160 gmonth-1).
CONCLUSION: The results indicated that biochar produced from SMS using microwave vacuum pyrolysis shows great potential in retaining water and nutrient that in turn promotes the formation of mycelium that leads to increased growth of mushroom in its cultivation.
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