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Fun Facts about Tube Floc

  1. What is a floc?
  1. What is a tube floc?
  1. How many setup do we have currently?
    So far, we have two setups as you can read here and here.
  1. What cool experiments have we done so far?
    We've done so many cool things. Apart from collecting settling datasets to the process controller and analyze them, we also took videos and planning to track how the particles move and behave.

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Checklist for the setup

  • Make sure all connection is tight.
  • Make sure that there is no clogging in the floc and pump tubes
  • Check the tube size (both pump and floc) and the pump panel setup
  • Check if the tube all goes in the correct direction, especially if you have made changes with the tube setup
  • The data connectors are easily unplugged, so check them out!

Summary of stock preparation

 

Amount of water

Amount stock added

Stock concentration

Unit

Liter

gram

g/L

Clay

11

22.2

2.02

Alum

11

16.5

1.5

Humic acid1

 

0.375

3.5 mg/L

1 Humic acid is added to the clay stock solution

Checklist for the Process Controller

  • Check the source page
  • Check the location of data stored

Troubleshooting

What to do if you don't see any flocs forming in the settling tube?

  • Always check tube connections and make sure there is no clogging in the connections.
  • Check the stock solutions. Make sure that there is no sedimentation occurring in clay and alum stock solutions.
  • Check the influent turbidimeter. If it displays lower turbidity, then check the clay and alum stock solutions. Check if the flow coming out of the pumps. Check clay/alum flowrates with timer and graduated cylinder. Change in the process controller so that it will give correct value of clay/alum.
  • Check bubbles in the floc and settling tubes, especially at the influent of the settling tube. Flocs could get trapped in the bubbles.

How to manually clean tube flocculator? (Credit to Monroe)

  1. Turn the Process Controller OFF
  2. Prepare a small peg by the size of tube inner diameter by cutting the sponge
  3. Insert the peg at the starting point of the tube flocculator
  4. Press the pressure bottle (200kPa) to move the peg in
  5. Turn the Process Controller ON (State 2 - Clean Flocculator)
  6. Watch it does its magic
  7. Turn the Process Controller OFF when it almost reaches the end of tube.
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