AguaClara Flow Through the Plant Quiz

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Full name *

NetID *

Why must chlorination happen at the end of the plant? *

Because flocculation and sedimentation won't work if chlorine has already been added

Because chlorine does not kill pathogens in turbid water

Because organics in the influent will react with chlorine to form carcinogens

Both the second and third options

Why is the floc weir important? *

It regulates the height of water in the sedimentation tanks and makes sure they don't overflow

It is how sludge is removed from the sedimentation tanks

It ensures that the floc blanket does not rise up into the plate settlers

None of the above

What is the purpose of the rapid mix tube? *

Ensures that coagulant is completely distributed throughout influent water

Resuspends settled particles before they enter the flocculator

Causes collisions between particles that allow flocs to form

None of the above

Why is the length of the flocculator significant? *

To ensure that the coagulant is completely mixed with influent water

So that particles are effectively removed from turbid water

To provide enough collision potential to produce fully formed flocs

None of the above

Why are the angles at the bottom of the sedimentation tanks important? *

The change in area results in a deceleration of water in the tank which leads to improved sedimentation performance

To ensure that settled particles slide down the angle and reach the drain

The decrease in total tank volume decreases the hydraulic residence time of the tank

None of the above

What is the purpose of the LFOM? *

To make sure flow in the plant remains constant with an influx of water in the entrance tank

A secondary trash rack to filter out smaller debris particles so they don't enter the plant

To maintain a linear relationship between the height of water in the entrance tank and the flow in the plant

None of the above

What is the significance of the diffusers on the inlet manifold? *

They prevent horizontal velocities from occuring in the sedimentation tank

They cause increased velocities in the diffuser increase particle collisions which allows flocs to settle out

They evenly distribute water within the sedimentation tank

None of the above

What is the primary purpose of the plate settlers? *

They reduce the depth of the sedimentation tanks, thus reducing construction costs

They act as a filter for large, low density particles that didn't settle out during sedimentation

To increase headloss through the top part of the sedimentation tank, providing a more even flow distribution

None of the above

Why must flocculation and sedimentation precede filtration in AguaClara plants? *

Particles that have not been flocculated will be too small, and will pass through the filter

Extremely turbid water will clog the filter too quickly for filtration to be effective

They don't have to, filtration alone will effectively treat water

None of the above

What is the approximate average effluent turbidity of AguaClara plants (without filtration)? *

5 NTU

1 NTU

0.3 NTU

None of the above

What is the advantage of AguaClara treatment plants that make them more sustainable than conventional facilities? *

AguaClara plants require less chemicals (alum and chlorine) per liter of water treated than conventional plants

Aguaclara plants have a lower operating cost because they do not use electricity

Point-of-use treatment technologies are always more appropriate in the developing world than centralized facilities

None of the above

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