Lishan Zhu's Individual Contribution Page
Spring 2016 Contributions
I am advising the fluoride and public relations teams, and working as part of the High Rate Sedimentation - Plate Settlers team this semester. Sedimentation is the process that requires the largest plane view area in a water treatment plant, and this is due to the necessary slow upflow velocity to allow particles to fall down. In hopes of overcoming that obstacle, the two high rate sedimentation teams this semester are looking at ways of concentrating the floc blanket to permit this higher upflow velocity. The team I am a part of this semester will focus on using plate settlers in the floc blanket to concentrate floc particles.
Fall 2015 Contributions
I am advising the ram pump and StaRS Theory teams, and working as part of the EStaRS team this semester. The EStaRS filter currently has orifices in the inlet manifolds, which has not previously been tested in a full scale filter. This semester, we are looking to fine tune the filter for backwashing and verify that orifices are an effective method of fabrication. If all goes well, we plan on modeling head loss through the sand bed at various turbidities of influent water.
Spring 2014 Contributions
This semester, my team members and I are working on the Low Flow Stacked Rapid Sand filter (LFSRSF). One of the main challenges this semester is adding the piping, entrance, and exit tanks and making the system water-tight.
Fall 2013 Contributions
I joined the low flow stacked rapid sand filter team this semester, and was part of the sub-sub team that worked on fabricating a new 12 inch diameter filter from PVC pipe. This design will be the representative of the dimensions of sand filters currently being tested in India.
Spring 2013 Contributions
I joined the foam filtration team this semester, and this semester we plan to redesign the foam filter using two 4 inch PVC pipes filled with foam. One will serve as the rough filter, which will have foam with a lower pore density. The other will be the finishing filter, which has a finer pore foam so water that leaves the rough filter can enter the fine filter. We also need to find a way to build a new stand for the two filters that are made of 80/20 aluminum since that is not a viable choice to use in Honduras.