Question

In: Biology

Q4. A small community of 50 members in Bidiya has decided to build a mini biogas...

Q4. A small community of 50 members in Bidiya has decided to build a mini biogas plant in their area. The waste required for biogas production was collected from different the cows grazing in the farm. Daily consumption of gas per person is a person is 500 liters. Take the specific gravity of the slurry as 1.165 gram/cm 3. For a retention period of sixty-three days design a bio digester. What would be your conclusion regarding the amount of biogas produced in a day, energy generated by the plant in a year, number of cows required to produce the required waste? If 20 more members are joined to this community, what is your suggestion on meeting their daily requirement of gas? Justify your answers with valid data. Also discuss the factors influencing the performance of various stages such as collection stage, anaerobic stage and power generation stage of the entire system.

Expert Solution

Given,

Per day consumption of gas per person is liters

Thus, total gas to be produced per day

lites

liter cubic meter

Thus, total gas produced per day cubic meter

Total weight of slurry produced

cubic centi meter gram/cm 3

kilo gram per day

Retention Period is of days, thus the digester must be able to hold atleast days slurry

Volume of bio digester considering days retention

cubic meter

The average calorific calorific value of biogas is about MJ/m³

Thus, energy produced per day

Mj

Energy produced in a year

Mj

Mj Kj

Thus, Energy produced in a year in Kilo joules

Kilo Joules

Amount of solid dung

kilo gram per day

An average cow produce kilograms of dung

Thus, number of cow required

cows

If more members are added, the requirement of cow dungwill increase as energy requirement will increase, thereby the size of biodigester and slurry input will also increase.

with per person daily consumption of liter gas , the additional requirement of gas will be

liters

Total increased gas requirement per day would be cubic meter, there by increasing the tota gas requirement from cubic meter to cubic meter

gladiator answered 3 years ago

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