A professional who controls fermentation chambers and tanks to produce enzymes from fungal or bacterial growth for use as industrial catalysts. Respnsibilities include:

• Sprinkles seed from hand container into mixing drum containing culture medium, such as bran, and starts drum revolving for specified time to disperse seed throughout medium.
• Opens drum to discharge batch into tubs, and shovels batch onto trays.
• Places trays on racks and pushes them into growing chambers.
• Sets thermostats, observes pressure gauges and meters, and moves controls to maintain specified atmospheric conditions that promote growth of culture.
• Examines batch for contamination by smell, touch, or observation, using knowledge of fermentation reactions.
• Removes trays from chamber after specified time.
• Dumps contents onto conveyor that transfers material through delumping machine into portable tanks.
• Positions tanks under water faucets and opens valves to flush enzymes through sieve.
• Turns valve to siphon solution through series of portable tanks into head tank.
• Tests extraction for specific gravity, acidity, and alkalinity, using hydrometer and litmus paper; and adds specified salts, acids, or bases.
• May start centrifuge to separate solids from product.