We went down to the farm again, this time to take the sample for the anaerobic digestion. First we had to open the middle butterfly valve to allow the sludge to drop from the anaerobic to the aerobic stage, later we had to call the technicians from Ensure Engineering down to help us connect the oxygen tank for aeration. Apart from that, we also realized that the overflow pipe was incorrectly connected to the water supply line and hence, it also took us quite awhile to reconnect the pipings. Finally, we turned on the heat exchanger to heat the sludge. To test that heat was coming through, we used water to pour over the heat exchanger and touched it to ensure that it is warm.
Our result from this testing shows that the digestion had some problems with it. Many of the results do not follow the trend, such as the increase in COD and nitrogen, which also means the sludge before digestion is less toxic than that after digestion. Our results are shown below.
Sludge weight: 48.7796g
pH: 10.73
Volatile Acids: 5mg/L
Dissolved Oxygen: 3.01ppm
Chemical Oxygen Demand: 279mg/L
Nitrogen: 25mg/L
Phosphorous: 1.3mg/L
Potassium: (Have not completed, insufficient reagents. Reagents to be obtained second week of October)
Saturday, October 3, 2009
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