Untitled Presentation

Multiple Choice

What is the purpose of trade waste interceptor traps?

• To filter solid waste

• To prevent blockages in plumbing

• To treat wastewater

• To store hazardous materials

Multiple Choice

What is the focus of Unit Standard 30613?

• Installation of food grease interceptor traps

• Trade waste types

• Sources of trade waste

• Management of waste

Multiple Choice

What are the key components of Unit Standard 30612 regarding trade waste management?

• Trade waste types

• Installation of grease traps

• Good practice for installation

• Food waste management

Multiple Choice

What is the purpose of grease traps in managing trade waste?

• To filter out solid waste

• To separate grease from wastewater

• To neutralize harmful substances

• To cool down hot liquids

Multiple Choice

What are the different types of trade waste classified in the New Zealand Building Code (NZBC) G14 Industrial Liquid Waste?

• Prohibited trade waste

• Conditionally acceptable trade waste

• Acceptable trade waste

• All of the above

Multiple Choice

Trade waste may require certain levels of treatment so that the quality of the treated discharge meets acceptable standards. What are some of the regulations that territorial authority bylaws will have regarding trade waste?

• Compliance

• Discharge of trade waste

• Testing

• All of the above

Multiple Choice

What are the classifications of trade waste that you need to identify?

• Waste containing organic compounds

• Waste containing metals and cyanides

• Other chemical waste

• All of the above

Open Ended

List the types of industrial waste mentioned in the table along with their industry sources.

Multiple Choice

What is the typical treatment and disposal method for waste containing metals and cyanides?

• Neutralisation

• Sedimentation flotation

• Chemical precipitation

• Ion exchange

Multiple Choice

What are the typical contaminants found in the waste from meat processing?

• Soluble and suspended solids

• Proteins

• Fat and grease

• Alkalis

Multiple Choice

What are the three classifications for trade waste?

• Prohibited

• Conditionally Acceptable

• Acceptable

• None of the above

Multiple Choice

What are the prohibited characteristics of waste discharge?

• Harmful solids

• Flammable liquids

• Medical wastes

• Asbestos

Multiple Choice

Which of the following factors are considered when determining conditionally acceptable trade waste?

• Temperature

• Suspended solids

• Oil and grease

• All of the above

Multiple Choice

What are the examples of commercial premises that usually generate acceptable trade waste?

• Day care centres

• Florists

• Ice cream parlours

• Restaurants

Multiple Choice

What are the four common types of interceptor traps used to contain, isolate, or treat trade waste?

• grease traps

• oil and grit traps

• neutralising traps

• silt traps (mud tanks)

Open Ended

What are the consequences of not regularly emptying a grease trap?

Open Ended

Explain the operation of grease traps and how they separate grease from wastewater.

Multiple Choice

What is the purpose of a grease trap in wastewater management?

• To filter solid waste

• To intercept grease from wastewater

• To store wastewater

• To cool down hot water

Open Ended

Explain the importance of preventing grease from cooling and solidifying in the inlet drain of a grease trap.

Multiple Choice

What materials are commonly used to construct grease traps?

• Wood

• High-density polyethylene

• Glass

• Aluminum

Multiple Choice

What is the minimum size for a grease trap according to the guidelines?

• 50 litres

• 100 litres

• 150 litres

• 200 litres

Multiple Choice

What type of filter replaces the outlet square junction on some grease traps?

• Plate type filter

• Mesh filter

• Carbon filter

• Paper filter

Multiple Choice

What is the purpose of the tight fitting lids on the grease trap?

• Prevent foul odours

• Allow easy access

• Increase capacity

• Reduce maintenance

Multiple Choice

What is the invert level for the inlet pipe in relation to the outlet pipe in a grease trap?

• 100 mm higher

• 50 mm lower

• Equal

• 200 mm higher

Multiple Choice

What should be included in the customer handover sheet for grease traps?

• Instructions for maintenance

• Records of emptying

• Health hazard reminders

• All of the above

Multiple Choice

What is the minimum vent outlet height required for grease traps?

• 30 mm

• 50 mm

• 70 mm

• 100 mm

Multiple Choice

What should be done to ensure the grease trap is sound after installation?

• Fill with water to check for leaks

• Leave it empty for a week

• Seal all openings

• Ignore manufacturer's instructions

Multiple Choice

What are the requirements for installing grease traps?

• Easy access for maintenance

• Protection from damage

• Installation on approved bedding

• All of the above

Multiple Choice

What is the purpose of grease converters in commercial kitchens?

• To trap oil and grease

• To store food waste

• To clean kitchen surfaces

• To recycle water

Open Ended

Explain how gravity plays a role in the operation of oil and grit interceptor traps.

Multiple Select

What are the key features of an oil and grit interceptor trap as shown in the diagram?

• Silt trap

• Chambers

• Vents

• Discharge pipe

Multiple Choice

What is the purpose of oil and grit interceptor traps?

• To separate oil from water

• To store oil for recycling

• To filter out solid waste

• To prevent flooding

Open Ended

Explain how the actuators work in the petrol/oil interceptor trap system.

Multiple Choice

What is the purpose of the butterfly valve in the petrol/oil interceptor trap?

• To hold the valve in the closed position

• To divert rainwater straight to the stormwater drain

• To activate the interconnecting switch

• To separate hydrocarbons from stormwater run-off

Open Ended

What chemical reaction occurs when acidic waste is neutralised with alkali?

Open Ended

Explain how acidic waste can be neutralised using limestone chips.

Multiple Choice

What could happen if acidic waste entered a wastewater system?

• Corrosion of sewer structures

• Release of toxic gases

• Disruption of biological treatment processes

• All of the above

Multiple Choice

What is the purpose of neutralising interceptor traps in wastewater management?

• To increase the acidity of wastewater

• To reduce the acidity or alkalinity of wastewater

• To store wastewater

• To filter solid waste

Multiple Choice

What is the purpose of the automatic pH control system in the treatment of alkali waste?

• To measure the temperature of the waste

• To neutralise acidic waste only

• To control the pH level of the waste

• To store alkali waste

Multiple Choice

Why is monitoring pH levels in water important for environmental health?

• It helps determine the water's temperature

• It indicates the presence of harmful chemicals

• It helps in identifying the water's color

• It measures the water's flow rate

Open Ended

Explain the construction materials typically used for silt interceptor traps and their purpose.

Multiple Choice

What must occur for the silt interceptor trap to work properly?

• The down leg outside the trap must be deeper than the outlet of the trap

• Air must be able to enter with the wastewater

• Full flow of the wastewater must not occur through the outlet pipe

• The trap must be emptied manually

Multiple Choice

What are the two methods used to get waste to flow upwards in a silt interceptor trap?

• Half-siphon method

• Full-siphon method

• Gravity method

• Pressure method

Multiple Choice

What is the purpose of a cooling pit or cooling interceptor trap?

• To cool trade waste before discharge

• To store hot water

• To filter solid waste

• To increase water temperature

Multiple Choice

What are the three methods for measuring flow rates mentioned in the text?

• Open channel with V notch

• Paddle wheels or turbines

• Ultrasonic flow meters

• Pressure gauges

Poll

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