Extras Flashcards
How does the waste composition (in terms of carbohydrates, fats and proteins) affect the composition of the landfill gas during the methanogenic degradation phase? B) Copy the figure below to your writing paper and mark where (approximately) the different substrates would be located.
A) Higher amount of fats and proteins give more methane production.
B) Higher fats between -2 and -1 in oxidation number.
Lower fatty acids approximately -1.
Proteins and carbohydrates 0.
Acids 0 to +2.
- Why is the heat release from biological methane oxidation lower than from combustion of the same waste? Approximately, how much lower is it?
Due to some gas escaping into other cells and not becoming oxidized.
It is approximately 40% lower
Describe hydraulic conductivity and what affects it?
Hydraulic conductivity, K, is the flow of fluid through the pore structure of a waste. A function of the degree of compaction. Depends on porosity, grain size, gradin etc of the material as well as the liquids viscosity.
Hydraulic conductivity decreases with depth in Swedish soils due to till.
Clay has hydraulic conductivity 10^-8 or less.
Hydraulic conductivity can be impacted through compaction or thickness of layers.
What is the formula for L/S?
L = I * t + M + (1-TS) * H * D
S = TS * H * D
What is the formula for TS and VS?
TS = after cool oven / before cool oven *100
VS = (weight after cooler oven – weight after hot oven)/weight after cool oven *100
What is bulk density?
The bulk density is measured by filling the original waste (not dried) into a glass beaker or cylinder, slightly compacting the material (through shaking and tapping while filling) and
weighing the mass of a certain volume (e.g. 1 liter). Repeat several times. Density = mass/volume
