Week 1

Question 1

Types of water in the food industry

Answer 1

General purpose, cooling water, boiler feed water, process water

Question 2

What are the characteristics of general purpose water

Answer 2

Used for washing and sanitizing
Used in the largest amounts
Should be potable, clear, colorless, and free of contaminants

Question 3

What are the characteristics of process water

Answer 3

Used for cooking
Must be potable and sufficient quality

Question 4

Characteristics of cooling water

Answer 4

Not in contact with food
Does not have to be potable

Question 5

What are the characteristics of boild feed water

Answer 5

Requires the removal of hardness
The only treatment process to the water
Requires demineralization

Question 6

Types of water treatment and function

Answer 6

Coagulation: to reduce surface charge on colloids
flocculation: make small flocs into large flocs
sedimentation: removal of suspended water
adsorption/filtration: regeneration operation and one-way operation
disinfaction: destroy taste and odor causing compounds and eliminate color

Question 7

Materials removed by activated carbon

Answer 7

Specific organic molecules that causes taste and odor
Natural organic matter (NOM) that causes colors
Disinfection by product (DBP)
Volatile organic compounds (VOC)

Question 8

Forms of activated carbon and suitable for what phase

Answer 8

Granular activated carbon, wide ranging liquid phase and gas phase
Powderd activated carbon, liquid phase treatment and flue-gas phase
Extruded activated carbon, gas phase

Question 9

Most common chemical oxidants?

Answer 9

Chloride
Chloride dioxide
Permanganate
Ozone

Question 10

Types of suspended growth reactors for biological treatments

Answer 10

Activated sludge
Squencing batch reactors
Membrane bio reacor (MBR)

Question 11

Function of suspended growth bioreactors

Answer 11

Used to biologically degrade organic constituents in wastewater under aerobic conditions

Question 12

Function of membrane module

Answer 12

Separation of microorganisms in treated waste water

Question 13

Applications of steam and what is it produced in

Answer 13

Processing, heating, sanitizing
Boiler

Question 14

Requirements of boiler

Answer 14

Water must be contained safely
Steam must be safely delivered in desired conditions

Question 15

Types of boiler and the capacities

Answer 15

Fire tube boiler, small steam capacities and low to medium pressure
Water tube boiler, low to high steam capacity

Question 16

Applications of electricity in food industry

Answer 16

Industry relies on electricity as the main energy source to control all systems

Question 17

How to generate electricity

Answer 17

With generator
The energy to drive the generator: diesel engine, a water wheel in hydroelectric system, steam (turbine)

Question 18

Types of current and their differences

Answer 18

Alternating current: polarity stays the same, voltage change over time
Direct current: the direction changes several times per second

Question 19

What is a compressor

Answer 19

Device to increase the pressure of air from low to high using external energy

Question 20

The use of compressed air

Answer 20

Movement of materials
Drying system
Operation of controls