One of the products of sewage treatment is sludge. After microorganisms grow in the activated sludge process to remove nutrients and organic material, a substantial amount of wet sludge is produced. This sludge must be dewatered, one of the most expensive parts of most treatment plant operations.
How to dispose of the dewatered sludge is a major problem. Some organizations sell dried sludge for fertilizer, some spread the sludge on farmland, and in some places it is burned. To burn a dried sludge, fuel oil is mixed with it, and the mixture is burned in a furnace with air. If you collect the following analysis for the sludge and for the product gas:
Sludge (%) | Product Gas (%) | ||
S | 32 | SO2 | 1.52 |
C | 40 | CO2 | 10.14 |
H2 | 4 | O2 | 4.65 |
O2 | 24 | N2 | 81.67 |
|
| CO | 2.02 |
a. Determine the weight percent of carbon and hydrogen in the fuel oil.
b. Determine the ratio of pounds of dry sludge to pounds of fuel oil in the mixture fed to the furnace.
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