From 8.00 a.m. to 12.25 p.m., I rearranged the registered FLOCs of DPRS equipment by following the decision made during yesterday's meeting. I had checked and updated the FLOCs before sending the file to Jaclyn.
At 9.15 a.m., we had a daily review meeting with the operators as usual.
At 11.15 a.m., Tee assigned me to experiment with coagulation and flocculation using a water sample taken from the final discharge point. He had demonstrated this experiment to me at the WWTP laboratory. He added 1.0 mL of ferric chloride (FeCl3) coagulant solution into 500 mL of water sample and then stirred the mixture rapidly. Initially, the brown-orange microflocs were formed.
Later, he added 1.0 mL of polymer solution (flocculant), stirred and allowed the settling of larger-sized flocs formed in the solution. However, we observed that the water sample was still in light orange colour (the solution is expected to be more transparent than the freshwater sample), even much polymer solution was added. He suspected that an exceeding amount of FeCl3 solution was added, giving this colour due to the presence of metal ions in excess.
At 2.00 – 5.15 p.m., I began my task by planning a procedure before performing the experiment. I made the observation, recorded down every single detail in my notebook and took photos. During this period, Tee came to the laboratory and asked me about the experimental outcome I had obtained so far. Then he requested me to repeat the experiment using a smaller dosing of 0.05 mL and 0.10 mL of FeCl3 solution to obtain an optimum dosing of FeCl3 solution as possible.
During the experiment, I wore a pair of latex gloves, especially when handling FeCl3 solution, an oxidizing agent. I was assigned to make a laboratory report and submit it to Tee by next Monday morning.
At 5.45 p.m., Tee told me that the commissioning of DPRS would
be carried out from next week onwards. I am looking forward to this
project.
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