GROWING GOURMET - Anto2ni.it

proof electrical fixtures are essential for safety.
Maximum Temperature: 90° F (32-33° C.)
Minimum Temperature: Ambient.
Humidity: Fluctuating from ambient to 100%.
Light: 200-500 lux. Needed only for ease of
personnel. Skylights or moisture-proof fluorescents
suffice.
Insulation: None needed.
Positive Pressurization: Yes, through HEPA filters
Additional Comments: Once this room is thoroughly
washed down with a dilute bleach
solution prior to spawning, the fan/filter system
is activated for positive pressurization. The filtration
system is ideally located overhead. Air
is passively or actively exhausted near to the
floor. During inoculation, this room becomes
very messy, with spawn and substrate debris accumulating
on the floor. Since the spawning
room is only used directly after each run
through the pasteurization chamber, it can serve
more than one purpose during non-spawning
day s.The spawning room should be adjacent to
the main corridor leading to the growing rooms
to facilitate substrate handling.
Environment 3:
The Pasteurization Chamber
or Phase II Room
Purposes: To pasteurize bulk materials (straw,
bagasse, etc.) by subjecting the substrate to
steam for a prolonged period of time (2-24
hours).
Facility: Usually rectangular, the pasteurization
chamber is a highly insulated room with a false
floor, usually screened or grated, under which
steam is injected. Two drains are recommended
MUSHROOM FARM ENVIRONMENT 457
per pasteurization box. The drains should have
a screened basket over them to prevent clogging.
Ideally the drain line should have a check or gate
valve to prevent contaminants being drawn into
the pasteurization box during cool-down. The
walls and floors must be constructed in such a
manner to withstand radically fluctuating temperatures
and humidities. Rooms are often
constructed of cinder-block, cement formed, or
temperature tolerant fiberglass reinforced plastic
(FRP). Wood construction is strongly
discouraged. The pasteurization chamber should
have amble head-space. Large farms use "walking
floors" or a net pulled by a winch, facilitating
off-loading. (See Figure 148.)
Maximum Temperature: 210° F. (99-100° C.)
Minimum Temperature: Ambient.
Humidity: 10-100% rH
Light: Minimal or none.
Insulation: r30+
Positive Pressurization: Yes, through HEPA filters.
Additional Comments: Pasteurization tunnels
take lot of abuse from the loading and unloading
of substrate. The screened floors should be removable
so waste debris can be gathered after
each run. Once emptied the rooms should be
doused with a bleach solution to limit the growth
of any mold colonies. I have seen pasteurization
tunnels made from reconverted old saunas, silage
vessels, grain silos, semi-trucks, ocean cargo
containers, beer fermentation vats, etc... Any
doors or openings must be tightly gasketed. Provisions
for the ease of filling and unloading aids
production efficiency.
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