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Contact Chamber (
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CC)
Spring 2016
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The Rapid Mix Contact Chamber team worked to build a contact chamber that allowed for the rapid mixing of raw water and coagulant, improving upon the existing Rapid Mix Tube by providing a larger volume for mixing to take place. The goal of the team was to determine the shape of the contact chamber that would result in the least coagulant loss and to determine the residence time needed to maximize mixing but minimize coagulant loss. The team used mass balance to determine the loss of coagulant to the flocculator walls and used pigging to clean the flocculator in between trials. Mass balance did not end up working for the team. The end up using a tube settler and its performance as a measure for coagulant loss. The results they found were that contact chambers lessen coagulant loss. They found that residence time has the largest effect and surface area to volume ratio has a smaller effect on coagulant loss. |
Fall 2016
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For the fall semester, the Rapid Mix Contact Chamber team plans to continue last semester's work in optimizing the design of the contact chamber and minimize coagulant loss in general. The team will test even more chamber designs as well as test how other variables affect the formation of nanoclusters. Another side goal is to use the data to form a scalable, optimized design. The team will try to figure out if the flocculator tube could be more efficient testing with the different filtration mechanisms.worked on assessing the utility of the contact chamber performance in the rapid mixing of raw water and coagulant. The team determined this performing the tests with and without the contact chamber using the coagulant properties which were found. The team ran different tests with a straight flocculator to find the relationship between head loss and nano cluster buildup and to measure the difference in the head loss values when the tests were run with and without the contact chamber. The team found that there was no significant effect on adding a contact chamber for the flocculator studied. |
Spring 2017
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Fall 2016's team tested differences in head loss when coagulant was added to the system with and without clay, to analyse whether higher turbidities decreased head loss. From replicating these experiments, the current team decided to build a coiled flocculator with 50 cm of headloss and a residence time of 1 minute, more like what is actually used in an AguaClara plant. However, the focus was later on moved back to the original flocculator. One important conclusion was a confirmation that the microbore tubing flocculator can be used as a tool to measure free coagulant by means of measuring headloss. In addition the team built a contact chamber with a design parameter of the ratio of total surface area of clay to surface area of the chamber. Experiments with this contact chamber and the microbore flocculator suggest that the former does help reduce coagulant loss in the flocculator. However, the dynamics of the coagulant within the contact chamber warrant further research . |
Fall 2017
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Fall 2017 team aims to design a contact chamber that minimizes contact of incoming fluid with the chamber walls. The length of the contact chamber is set to be approximately 10D. The team varied the residence time in the contact chamebr by varying D while keeping L/D constant. |
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Members Spring 2016Meng Zu - mz436@cornell.edu Jillian Whiting - jpw236@cornell.edu Aditi Athavale - asa85@cornell.edu |
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Members Fall 2016Joao Carlos Moraes Filho - jdm424@cornell.edu Javier Escanciano Cabaneros - je342@cornell.edu Mythri Krishnamoorthysujatha - mk2446@cornell.edu
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Members Spring 2017Philip Akpan - pa328@cornell.edu Karin Teuffer - kt428@cornell.edu Grace Zhang - tz76@cornell.edu |
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Members Fall 2017Cheer Tsang - ct542@cornell.edu Yeonjin Yun - yy374@cornell.edu Benjamin Gassaway - bsg73@cornell.edu |