project K:Research2
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=<span style="color:orange">PROCESS</span>= | =<span style="color:orange">PROCESS</span>= | ||
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| − | Food waste has a higher solid content than municipal wastewater, meaning that it is a more efficient use of digerester volume aka the digester can be smaller. | + | ==<span style="color:orange">Calculations</span>== |
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| + | * Food waste has a higher solid content than municipal wastewater, meaning that it is a more efficient use of digerester volume aka the digester can be smaller. | ||
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| + | * Peak methane production in a 15-day cycle, themophyllic digester was 10.8L/hr but averaged 4.8L/hr. | ||
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for 100 tons of “input”, 30 tons of “output” will then be composted | for 100 tons of “input”, 30 tons of “output” will then be composted | ||
Thus, 30% of input volume can be used for compost--> design constraint for a compost bin or hints at how many plants to have. | Thus, 30% of input volume can be used for compost--> design constraint for a compost bin or hints at how many plants to have. | ||
| − | Biogas composition is about 67% methane (CH4), 33% CO2 | + | * Biogas composition is about 67% methane (CH4), 33% CO2 |
thus the heat capacity is 670 BTU/Ft3 burned. | thus the heat capacity is 670 BTU/Ft3 burned. | ||
| − | CH4 production rate (ft3/lb)= CH4% X Gas Production ( ft3/day) TS% X Feed (gal/day) X 8.34 lbs per gal | + | * CH4 production rate (ft3/lb)= CH4% X Gas Production ( ft3/day) TS% X Feed (gal/day) X 8.34 lbs per gal |
peak values near 8.5 ft3 CH4/ lb food waste. 5ft3/lb average. | peak values near 8.5 ft3 CH4/ lb food waste. 5ft3/lb average. | ||
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1000ft3= 28.3 cubic meters | 1000ft3= 28.3 cubic meters | ||
| − | There are certain minimum dimensions | + | ==<span style="color:orange">Digester</span>== |
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| + | #There are certain minimum dimensions | ||
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| + | #It needs constant teperature | ||
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| + | #Position: above or below ground. | ||
| − | + | We decided to place the digester below ground, and we also ditch the idea of a plinth and incorporate our fire spaces into the earth as well. | |
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<div style="float: left; width: 900px; "> | <div style="float: left; width: 900px; "> | ||
[[Project K:Home| Back to Home]] | [[Project K:Home| Back to Home]] | ||
</div> | </div> | ||
Revision as of 16:43, 30 November 2011
PROCESS
Text
Text
Text
Calculations
- Food waste has a higher solid content than municipal wastewater, meaning that it is a more efficient use of digerester volume aka the digester can be smaller.
- Peak methane production in a 15-day cycle, themophyllic digester was 10.8L/hr but averaged 4.8L/hr.
for 100 tons of “input”, 30 tons of “output” will then be composted
Thus, 30% of input volume can be used for compost--> design constraint for a compost bin or hints at how many plants to have.
- Biogas composition is about 67% methane (CH4), 33% CO2
thus the heat capacity is 670 BTU/Ft3 burned.
- CH4 production rate (ft3/lb)= CH4% X Gas Production ( ft3/day) TS% X Feed (gal/day) X 8.34 lbs per gal
peak values near 8.5 ft3 CH4/ lb food waste. 5ft3/lb average.
1 ft3 CH4 at 67% methane = 670 BTUs and 13,400 BTUs = 1 kWh. this value is better than coal ( 10, 500btu/kwh)
av. of 2,300 ft3 per day/ 1,000 ft3 digester volume range (in ft3/day) = (1,100–3,200) with these figures, 4.79 kw/h of energy are created daily in a 1000ft3 digester! thats enough to run 48 100-watt lightbulbs continuously*
- these figures are the optimal output based on the chemical energy of the gas, not the conversion into electric energy by burning.
1000ft3= 28.3 cubic meters
Digester
- There are certain minimum dimensions
- It needs constant teperature
- Position: above or below ground.
We decided to place the digester below ground, and we also ditch the idea of a plinth and incorporate our fire spaces into the earth as well.
