Reverse Osmosis Water Treatment Concepts

The video explains the reverse osmosis process at St. Mary's water recycling plant. It details the construction and function of reverse osmosis membranes, which consist of multiple layers to filter out impurities. The process involves high-pressure vessels where water is forced through membranes, separating clean water from contaminants. The system is designed in stages to maximize water recovery, achieving an 80% recovery rate. The remaining concentrate, rich in salt and impurities, is sent to a wastewater treatment plant for disposal.

What is the primary purpose of the reverse osmosis membranes in the water recycling plant?

• To add nutrients to the water

• To decrease the water pressure

• To remove nutrients, chemicals, bacteria, and viruses

• To increase the water temperature

Which layer of the reverse osmosis membrane is responsible for removing impurities from the water?

• Micro porous poly cell phone layer

• Polyester fabric support base

• Polyamide barrier layer

• Feed channel spacer

What role does the feed channel spacer play in the water treatment process?

• It strengthens the barrier layer

• It seals the membrane sheets

• It collects the final recycled water

• It provides turbulence and space for feed water

How is the final recycled water product collected in the system?

• It is collected in the feed channel spacer

• It is stored in the polyester fabric support base

• It is absorbed by the polyamide barrier layer

• It flows into the permeate channel and collects in the core tube

How many spiral wound elements are loaded in one pressure vessel?

• Eight

• Seven

• Six

• Five

What is the main advantage of having multiple stages in the reverse osmosis treatment trains?

• It increases the amount of concentrate waste

• It reduces the amount of recycled water

• It simplifies the water treatment process

• It produces the highest amount of recycled water with reduced concentrate waste

How many pressure vessels are there in stage one of the treatment trains?

• 12

• 52

• 24

• 36

What percentage of recycled water is extracted at stage 1?

• 65%

• 35%

• 5%

• 10%

What happens to the concentrate that is not economically viable to recycle?

• It is stored for future use

• It is treated and released into the ocean

• It is recycled into drinking water

• It is evaporated

What is the average daily production of recycled water at the plant?

• 58 million litres

• 50 million litres

• 8 million litres

• 65 million litres