Floating Floc Meeting Minutes

Spring 2009 Minutes

February 27, 2009

Working Group: Bubbles

Accomplishments

• Collected data
• Solved DO probe bubble problem
• Posted summaries of articles
• Wrote Meeting Minutes

Metrics

• Moved the DO probe so we no longer have bubble formation issues
• Ran experiments

Outcomes

• Another improvement to the system

Issues

• Redo AutoCAD drawing of system
• Plans for action
• Doubt about accuracy of DO probe

Working Group: Sand Filter

Accomplishments

• Ran four tests: without sand, sand at 50mL/min, sand at 100mL/min, and sand at 200mL/min
• Add more references in the Annotated Bibliography

Metrics

• Analyze the collected data with Excel. These initial data are not reliable due the varying flow rate and DO readings.
• Overall, the data show that the inflow DO is lower than the outflow DO.
• The present of the sand filter does not reveal dramatic differences between the filter with and without the sand.

Outcomes

• Final drawing of the experimental setup is done.
• For a potential solution to the inconsistent flow rate, we added a Bell & Gossett pressure reducing valves.
• Since the DO probe are not reading the DO concentration in the water, we decide to apply another way to measure the DO concentration by using the air volume and the flow rate. We will calculate the DO concentration with Mathcad.

Issues

• DO read that the initial DO is lower than the outflow DO for all experiments.
• When the setup starts to run, the inflow DO is too low (as low as 4 mg/L).
• Despite the recalibration of both DO probe, the DO reading still remain incorrect.
• An attempt to fix the DO probe reading: we switch the orginal inflow DO probe with another DO probe.
• The flow rate of the setup is not consistent.

Any Overall Team Comments:

• Great work.