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Questions and Answers
What is the main function of a biogas digester?
What is the main function of a biogas digester?
- To break down organic waste through anaerobic fermentation (correct)
- To transport biogas
- To generate solar energy
- To store organic waste
Biogas digesters only exist in large-scale industrial setups.
Biogas digesters only exist in large-scale industrial setups.
False (B)
What are the main gases produced by the process within a biogas digester?
What are the main gases produced by the process within a biogas digester?
Methane and carbon dioxide (CO2)
Biogas can be utilized for ______, heating, and lighting.
Biogas can be utilized for ______, heating, and lighting.
What is a key variable to monitor for biogas project effectiveness?
What is a key variable to monitor for biogas project effectiveness?
Biogas can contribute significantly to the national energy balance in some countries.
Biogas can contribute significantly to the national energy balance in some countries.
Name one use of the liquid waste (slurry) produced from a biogas digester.
Name one use of the liquid waste (slurry) produced from a biogas digester.
Match the following biogas-related concepts with their descriptions:
Match the following biogas-related concepts with their descriptions:
What is the assumed gas storage volume percentage in a biogas plant based on the rated daily gas production?
What is the assumed gas storage volume percentage in a biogas plant based on the rated daily gas production?
Digester volume and gas storage volume can be measured directly in most biogas plants.
Digester volume and gas storage volume can be measured directly in most biogas plants.
What are the two main components of total plant volume in a biogas plant?
What are the two main components of total plant volume in a biogas plant?
In a floating drum plant, the gas holder height is typically measured in ______.
In a floating drum plant, the gas holder height is typically measured in ______.
Match the following biogas plant designs with their descriptions:
Match the following biogas plant designs with their descriptions:
Which of the following is NOT a type of biogas plant mentioned?
Which of the following is NOT a type of biogas plant mentioned?
Average values for digester and gas storage volumes can vary based on local information.
Average values for digester and gas storage volumes can vary based on local information.
What is a key factor when using Table 2 to estimate total plant volume?
What is a key factor when using Table 2 to estimate total plant volume?
What is the formula used to calculate the digester volume (Vd)?
What is the formula used to calculate the digester volume (Vd)?
The floating drum plant design consists of a cylinder on top of a hemisphere.
The floating drum plant design consists of a cylinder on top of a hemisphere.
What other design is mentioned for biogas plants apart from the fixed dome plant?
What other design is mentioned for biogas plants apart from the fixed dome plant?
The total plant volume can be calculated as the volume of two __________.
The total plant volume can be calculated as the volume of two __________.
Match the following components with their respective formulas:
Match the following components with their respective formulas:
What measurement is necessary to calculate the volume of a biogas plant?
What measurement is necessary to calculate the volume of a biogas plant?
The diameter of the digester can be calculated using its circumference.
The diameter of the digester can be calculated using its circumference.
What does Vg represent in the context of biogas plant volume?
What does Vg represent in the context of biogas plant volume?
Which type of material typically has a high energy content when added to a biogas digester?
Which type of material typically has a high energy content when added to a biogas digester?
The amount of water added to a biogas digester should be recorded separately from the weight of other waste materials.
The amount of water added to a biogas digester should be recorded separately from the weight of other waste materials.
What information needs to be collected daily for biogas production calculations?
What information needs to be collected daily for biogas production calculations?
The weight of animal waste produced by different species can be used to calculate _____ for the digester.
The weight of animal waste produced by different species can be used to calculate _____ for the digester.
Match the following types of waste with their descriptions:
Match the following types of waste with their descriptions:
How should respondents report their waste inputs if they cannot divide them by type?
How should respondents report their waste inputs if they cannot divide them by type?
Hens are a type of animal waste measured for biogas production.
Hens are a type of animal waste measured for biogas production.
What is the purpose of measuring digester volume?
What is the purpose of measuring digester volume?
What is the first step in calculating the daily waste input in kg?
What is the first step in calculating the daily waste input in kg?
The final value for daily waste input is converted from litres to m3 by dividing by 1,000.
The final value for daily waste input is converted from litres to m3 by dividing by 1,000.
What is the formula used to calculate the feedstock retention time (R)?
What is the formula used to calculate the feedstock retention time (R)?
The initial concentration of volatile solids (S) is calculated by dividing the weight of _______ solids added each day by the daily waste inputs.
The initial concentration of volatile solids (S) is calculated by dividing the weight of _______ solids added each day by the daily waste inputs.
Match the feedstocks with their volatile solids content:
Match the feedstocks with their volatile solids content:
If the total daily feedstock volume is 0.08 m3/day and the digester volume is 5.0 m3, what is the feedstock retention time?
If the total daily feedstock volume is 0.08 m3/day and the digester volume is 5.0 m3, what is the feedstock retention time?
Adding more water to the waste input does not change the amount of input calculated for the digester.
Adding more water to the waste input does not change the amount of input calculated for the digester.
What is assumed about the daily waste input in kg regarding its volumetric input?
What is assumed about the daily waste input in kg regarding its volumetric input?
Flashcards
Biogas Digester
Biogas Digester
An airtight container where bacteria break down organic waste to produce biogas.
Biogas
Biogas
A gas primarily made up of methane and carbon dioxide generated from anaerobic decomposition of organic matter.
Anaerobic Fermentation
Anaerobic Fermentation
A process where bacteria break down organic matter in the absence of oxygen.
Fixed Dome Digester
Fixed Dome Digester
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Floating Drum Digester
Floating Drum Digester
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Biogas Plant Dimensions
Biogas Plant Dimensions
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Feedstock
Feedstock
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Feedstock Retention Time
Feedstock Retention Time
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Initial Concentration of Volatile Solids
Initial Concentration of Volatile Solids
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Slurry
Slurry
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Questionnaire Module M2
Questionnaire Module M2
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Questionnaire Module M4
Questionnaire Module M4
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Measuring Diameter (Tape)
Measuring Diameter (Tape)
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Measuring Diameter (Circumference)
Measuring Diameter (Circumference)
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Data Collection (Energy)
Data Collection (Energy)
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Data Collection (Socio-economic)
Data Collection (Socio-economic)
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Study Notes
Biogas Digester
- A biogas digester is an airtight container where bacteria break down organic waste through anaerobic fermentation.
- This process generates biogas, primarily methane and carbon dioxide (CO2).
- Biogas can be used for cooking, heating, lighting, and electricity generation.
- The process also produces liquid waste (slurry), which can be used as fertilizer.
Biogas Digester Design
- Biogas digesters come in various sizes, from small-scale household units to large communal and industrial digesters.
Fixed Dome Plant (Chinese Design)
- It consists of a hemisphere on top of a cylinder with a curved or flat bottom.
- The volume can be calculated from the measured diameter (D) using a formula.
Floating Drum Plant
- It is usually circular and consists of two cylinders: a larger digester and a smaller gas storage tank placed on top.
- The volume is calculated as the volume of two cylinders.
- Measurement involves determining the diameter (D) and height (H) of the digester.
Questionnaire Module M2
- This module provides questions to record biogas plant dimensions.
- Questions are tailored to the specific types of digesters in a country.
Measuring Biogas Plant Dimensions
- The diameter of the digester can be measured directly if a tape can be placed across the top of the gas storage tank.
- Alternatively, the diameter can be calculated by measuring the circumference of the digester or gas storage tank and dividing it by pi (3.14).
Questionnaire Module M4
- This module collects information about the types and amounts of feedstocks added to the digester each day.
Estimating Feedstock Input
- Data on the weight of waste produced by different animals is used.
- The weight of other materials added to the digester, except water, is also recorded.
Feedstock Retention Time
- Calculated by dividing the digester volume by the total feedstock volume (including water).
Initial Concentration of Volatile Solids
- Calculated by dividing the weight of volatile solids added each day by the daily waste inputs.
Importance of Data Collection
- National energy statistics, project and policy monitoring require biogas data collection.
- Essential data includes plant capacity, biogas and electricity production, number and size of plants, their condition, and socio-economic impacts.
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Description
This quiz explores the concept of biogas digesters, their design, and functions. Learn about different types, such as fixed dome and floating drum plants, and how they produce biogas from organic waste. Understand their applications in cooking, heating, and electricity generation.
