Worm Tower Calculations: Difference between revisions
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{{Hint|Basic numeracy: 1 kg worms processes 1 kg waste}} | |||
=Problem Statement= | =Problem Statement= | ||
Using [[Aquaponic Towers]] such as in the [[Aquaponic Greenhouse]] - how many of these towers - functioning as worm towers - would be required to process household blackwater? | Using [[Aquaponic Towers]] such as in the [[Aquaponic Greenhouse]] - how many of these towers - functioning as worm towers - would be required to process household blackwater? The towers were 6-10' tall, and 6" diameter. [[Volume Calculator]] shows a 10' tower is 1/20 of a cubic meter. | ||
Chemical Oxygen Demand per day per person is 100g - from [[Biodigester#Technical_Design_.2B_Calculations]]. About 1 lb wet feces per day. | Chemical Oxygen Demand per day per person is 100g - from [[Biodigester#Technical_Design_.2B_Calculations]]. About 1 lb wet feces per day. | ||
Feces is 75% water. [https://www.ncbi.nlm.nih.gov/pubmed/16802692]. It requires only 100 Whr to evaporate the water in feces. But, feces will be in a larger volume of water, such as 1 gallon - making it 0.6 kWhr for evaporation. Not bad. This would be an incinerating toilet. | |||
For worms - vermiposting works at approximately 1kg worm biomass per 1 kg feedstock per day - [https://www.sciencedirect.com/science/article/pii/S0960852499000553]. For 1 lb - that is 1/2 kg of worms - to process human waste per person. About 4000 worms to a kg of worms. [https://www.google.com/search?q=how+much+does+1000+earthworms+weigh&oq=how+much+does+1000+earthworms+weigh&aqs=chrome..69i57.13482j0j7&client=ubuntu&sourceid=chrome&ie=UTF-8] | |||
Worms consume 25% of their body weight easily per day - [https://urbanwormcompany.com/how-many-worms-need-compost-bin/] | |||
This [https://urbanwormcompany.com/how-many-worms-need-compost-bin/] implies easily 1/2 lb worms per cubic foot. | |||
'''500 worms, 1/2 lb, cubic foot'''. | |||
Thus, one tower at 2 cubic feet (10' long, 4" round) has 1 lb of worms. Thus, a beginner's tower - '''4 towers are required per person.'''. | |||
Thus - 8 cubic feet - about 1/4 of a cubic meter - are reqiured. | |||
=Links= | =Links= | ||
*[[Open Source Separating Toilet]] | *[[Open Source Separating Toilet]] | ||
*[[Aquaponic Greenhouse]] | |||
Latest revision as of 04:59, 15 February 2021
Hint: Basic numeracy: 1 kg worms processes 1 kg waste
Problem Statement
Using Aquaponic Towers such as in the Aquaponic Greenhouse - how many of these towers - functioning as worm towers - would be required to process household blackwater? The towers were 6-10' tall, and 6" diameter. Volume Calculator shows a 10' tower is 1/20 of a cubic meter.
Chemical Oxygen Demand per day per person is 100g - from Biodigester#Technical_Design_.2B_Calculations. About 1 lb wet feces per day.
Feces is 75% water. [1]. It requires only 100 Whr to evaporate the water in feces. But, feces will be in a larger volume of water, such as 1 gallon - making it 0.6 kWhr for evaporation. Not bad. This would be an incinerating toilet.
For worms - vermiposting works at approximately 1kg worm biomass per 1 kg feedstock per day - [2]. For 1 lb - that is 1/2 kg of worms - to process human waste per person. About 4000 worms to a kg of worms. [3]
Worms consume 25% of their body weight easily per day - [4]
This [5] implies easily 1/2 lb worms per cubic foot.
500 worms, 1/2 lb, cubic foot.
Thus, one tower at 2 cubic feet (10' long, 4" round) has 1 lb of worms. Thus, a beginner's tower - 4 towers are required per person..
Thus - 8 cubic feet - about 1/4 of a cubic meter - are reqiured.