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Please read through this list before ranking your preferred teams. Don't worry if you're not sure what everything means. Returning team members, Monroe, Julie, Matt, and Heather will be more than happy to get you up to speed. Just use this as a guide to see generally what kinds of things the teams are working on. Check out each team's page on the wiki for a more basic description of what they do and to see what work they've already accomplished.

Design

Challenges for Fall 2009

Subteam Leader: Heather Reed

Number of team members needed: 9-10

Important team member skills:

• CEE 3310, or equivalent Fluid Dynamics course
• CEE 4540 co-requisite
• Students must be comfortable with coding
• Students should be familiar with the AguaClara design
• AutoCAD and/or MathCAD knowledge is a plus
• We are willing to train new members

Challenges

Design Tool

• Check that all pieces are scaling properly
• Identify design errors and work with the team in Honduras to develop improved design algorithms
• Update the list of variables that are returned to the user to ensure that all relevant parameters are returned.
• Eliminate variables in the Variable Naming Guide that aren't used.

Chemical Doser

We are currently switching from the LFOM and laminar flow controller to a submerged orifice flow meter and orifice based flow controller.

• Need to develop AutoCAD code to draw this part of the plant
• Need to develop the transition from linear dose controller to nonlinear design algorithms for the orifice based dose controller

Entrance tank

• A first draft of this code has been created, but it has not yet been reviewed.
• The Rapid mix and Chemical Doser needs to be drawn in the entrance tank.

Rapid mix components

Requires review and possible upgrade to the first draft of the rapid mix design and then coding of the MathCAD to AutoCAD (MtA) code.

Chemical storage tanks

• These tanks need to be drawn. These may be an item that the onsite civil engineer will relocate to fit site conditions, but the design tool should show them at the correct elevation and in a reasonable location.

Floc Hopper Drain Valves

• Now that the The floc hopper has been drawn, we need to code and draw the valves that dumps the flocs from the floc blanket to wastecan be put on hold for this semester because we haven't been able to create a floc blanket in a full scale AguaClara plant. This task can wait until we develop a method to create a floc blanket.

Horizontal Flocculator

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Continue coding the flocculator

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to include the option for horizontal flocculation for large plants and determine the flow rate for the transition from vertical to horizontal flow.

• Document and describe the solution algorithm for the vertical flow flocculator
• Design a horizontal flow flocculator and develop a clear algorithm for the solution process
• Create the equation or system of equations that will determine whether a design will have a horizontal or vertical flow flocculator. The minimum flow for a vertical flow flocculator will be related to the minimum channel width given a channel width that is about 3 x the baffle spacing and the requirement that the baffle spacing be at least 45 cm for constructability.
• Develop a method to design both horizontal and vertical flow flocculators.
• Code the necessary drawing algorithms. Make the flocculator code as generic as possible to be able to handle both vertical and horizontal flocculators.
• Design and draw the drain system for horizontal flocculators when this transition should occur.

Vertical Flocculator

• Need to ensure that the size of the ports between channels does not exceed the size available on the floc tank wall. Also, ensure that the spacing of the baffles in the last channel does not force them into the exit channel space (this may be taken care of by switching to horizontal flow).
• The challenge of draining vertical flow flocculators that are large enough that the baffles are ferrocement needs special attention.

Flocculator Drain System for Vertical Flow

• Need to code and draw the flocculator drain system.

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• Continue to investigate the filter foam

Chemical Dose Controller

Challenges for Fall 2009

Subteam Leader:

Number of team members needed: 4

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