+256 786 189490
Bulambuli District Eastern Uganda
有助于对技术进行记录/评估的项目名称（如相关）Scaling-up SLM practices by smallholder farmers (IFAD)
有助于对技术进行记录/评估的机构名称（如相关）National Agricultural Research Organisation (NARO) - 乌干达
Biogas protects the environment through reduced tree cutting and emission of harmful gases and the bi- product removed from the digester is used as organic fertilizer that boosts crop production.
Domestic biogas plant converts livestock manure into biogas and organic fertilizer. The technique uses cow dung to produce methane gas for lighting and heating.
Domestic biogas plants convert livestock manure into biogas and bio-slurry, a form of organic fertilizer (fermented manure). Biogas is a renewable energy or gas produced by the breakdown of organic matter in the absence of oxygen. Most people in Uganda, especially in rural areas, don’t have access to electricity and mostly rely on firewood and charcoal (mostly in urban areas). This has led to depletion of forests since these forests are the main supply of wood fuel. The domestic biogas technique uses fresh cow dung to produce methane gas for lighting and heating.
This technology is viable for smallholder farmers with livestock that are capable of producing 25 kg of fresh dung per day, typically about five indigenous cows. This makes the technology suitable for smallholders in developing countries. Fresh cow dung is collected and mixed with water at a ratio of 1:1, depending on the thickness of the dung, to produce a free-flowing mixture. The mixture is poured into the digester where microbes break it down under an oxygen-free environment and in the process release methane gas which is harvested in a cylinder and piped straight into the home for lighting and/ or heating.
Dimensions for the Digester (4m in diameter and 3 m in depth). Overflow tank/ Outlet is 2 meters by 2 meters. Materials used in the construction of the plant include sand, cement, bricks, iron rods, gravel and water. Biogas stove, lamp and its appliances and gas controller or pressure gauge are connected after the construction of the biogas plant which can be purchased from specified outlets on the urban markets.
Production and use of biogas protects the environment through reduced tree cutting and emission of harmful greenhouse gases (GHG). It also eases the workload of rural women and children by providing a safe and cheap source of fuel since it reduces the risk encountered by children and women looking for firewood and spares their time that would otherwise be spent in the process. The bi-product (bio-slurry) removed from the digester at the end of the process is used as organic fertilizer which boosts crop productivity and is a highly nutritious feed supplement for animals.
The technology has safety issues especially on the side of children when it comes to the flammable gas.
The video couldn't be captured since the largest part of the biogas plant is below the ground and the system was constructed long ago before the documentation process.
Sisiyi Sub county, Gibuzale Parish, Bulabuli District
1.2899 , 34.3551
Kawcom Uganda constructs Biogas Plant for its coffee suppliers.
Coffee and Bananas
The technology is applied around the land user's homestead.
Irrigation performed during the dry season. i.e. around mid November to mid March while the river Gibuzale provides water for the biogas plant and for irrigation.
One can have 2 agricultural seasons if a field is NOT near a water source. Three (3) such season are possible if the field is near a river.
The technology addresses biological degradation (reduction of vegetation cover) through reduced cutting of trees for firewood.
Biogas reduces and prevents land degradation through reduction in deforestation to supply firewood and charcoal.
Components and Construction of the Bio gas plant
The size of the biogas plant is based on the availability of raw materials, use and financial status. The Biogas plant has the following components the inlet pipe/ tank, the digester, the outlet tank and gas pipe. Materials used in the construction of the plant include Sand, Cement, bricks, iron rods, gravel and water.
The land should be leveled before construction after which the pits are evacuated in their proper sizes and depth. After which construction of the walls begins with a mixture of cement and sand with a ratio of 1:4.
The inlet pipe is about 15cm in diameter which is connected to the digester. Dimensions for the Digester are 4m in diameter and 3m in depth with the thickness of 35cm and strong enough to with stand the load since they are partially buried under ground. The gas pipe is connected to the digester which carries the gas to the point of utilization, such as a stove or lamp. The digester is connected to the overflow tank which is 2 meters in diameter and 2meters in depth.
Biogas stove, lamp and its appliances and gas controller or gauge are connected after the construction of the biogas plant.
Production of Biogas
Biogas is produced from biodegradable materials such as animal dung mixed with water. Before the dung is fed into the plant, it is mixed with water in a tank or basin to give a solid content of 1: 1.5 ratios in the slurry. The mixture is discharged into the digester through the inlet pipe. The mixture ferments inside this digester and biogas is produced through bacterial action, the gas of which settles on top of the slurry in the digester which goes through a gas pipe connected on top of the tank. The gas pipe has a gas/pressure regulator which controls the outlet pressure of the gas to the gas burner or bulb. The digested slurry is discharged into the outlet tank through the outlet opening and use a fertiliser.
|1.||Plan and take measurements||结构性的||Not applicable|
|2.||Buy and deliver the construction materials||结构性的||Not applicable|
|3.||Dig the pits||结构性的||Not applicable|
|4.||Build the concrete||结构性的||Not applicable|
|5.||Put the pipes||结构性的||Not applicable|
|6.||Connect to the stove and lamp||结构性的||Not applicable|
|劳动力||Man labour (Digging the holes))||Person-days||2.0||13.89||27.78||50.0|
|劳动力||Man labour (Building)||person-days||20.0||4.17||83.4||50.0|
|其它||Pipes||piece @ 10m||3.0||4.17||12.51||50.0|
Kawacon Uganda Limited
Kawacom (U) Ltd imports coffee thus it supports coffee farmers who are its suppliers.
The length of the gas pipes also depends on the distance from the plant to the homestead.
|1.||Manual mixing of the dung & water||管理||Every Morning|
|2.||Add mixture (dung & water)||管理||Every morning|
|3.||Emptying of the the overflow||管理||When necessary|
|劳动力||Man Labour||persons- days||2.0||1.39||2.78||100.0|
The maintenance costs were estimated at a two weekly basis. Most smaller holders don't incur any costs on maintenance since labour and acquisition of the dung is got from their own cows and from friends which is free of charge and use family labour. The cost for water accounts for labour used to fetch the water from the stream
The construction costs, determined by the size of the biogas plant.
- < 250毫米
- > 4,000毫米
The zone receives a bi-modal pattern of rainfall, with the wettest months being April and October, while July to August and December to February are relatively dry.
Buginyanya Zonal Agricultural Research and Development Institute - BugiZARDI
- 0-100 m a.s.l.
- 101-500 m a.s.l.
- 501-1,000 m a.s.l.
- 1,001-1,500 m a.s.l.
- 1,501-2,000 m a.s.l.
- 2,001-2,500 m a.s.l.
- 2,501-3,000 m a.s.l.
- 3,001-4,000 m a.s.l.
- > 4,000 m a.s.l.
- 非常深（> 120厘米）
The area gets water from River Gibuzale that flows through the village.
- < 0.5 公顷
- 0.5-1 公顷
- 1-2 公顷
- > 10,000公顷
The land user owns 0.4 ha of land which is considered small in the area compared to other land owners who own over 4 ha.
The land user uses the organic manure in his coffee plantation which has greatly led to increased yields.
Bigger coffee beans
Use of biogas for lighting and heating
No costs on purchase of fertilizer since the land user applies the bi-product (fermented manure) of the biogas.
More yields hence more incomes
No more fetching firewood for cooking
Use of biogas reduces effects of smoke inhaled through the use of firewood hence reduced lung diseases.
Increased knowledge on the use of organic manure as a sustainability practice.
Biogas use favours women and the disabled as it reduces the workload of fetching firewood especially from distant areas or forests.
The bi-product from the biogas plant is watery hence its used in the farm to moist the soil
Use of biogas reduces tree cutting
The bi- product removed from the digester at the end of the process is used as organic fertilizer which increases activities of soil organisms hence soil accumulation.
The bi- product removed from the digester at the end of the process is used as organic fertilizer
Use of organic manure supports multiplication of organic matter in the soil
The dung and urine from the animals is used as material in the biogas plant which would have been washed away by run off water into the river.
The user doesn't have to encourage on the neighbours' land to fetch firewood since biogas is now used for heating.
Reduced bad smells from the dung
The technology has less impact on the off site since its practiced in the land user's homestead.
No maintenance costs involved hence higher benefits.
All received support from Kawacom (U) Ltd.
|It eases the workload by providing a safe and cheap source of fuel compared to firewood|
|The bi- product at the end of the process is used as organic fertilizer that boosts crop production|
|Biogas protects the environment through reduced deforestation hence climate change mitigation.|
|Inadequate dung||Collects dung from cattle owners in the area|
|Safety issues especially on the side of children when it comes to the flammable gas||Continuous safety education measures to prevent fire out breaks|
Uganda Domestic Biogas Programme (UDBP)
Power for the Poor From Animal Manure, Food Waste