Difference between revisions of "Biogas-fueled pump"

Revision as of 20:33, 29 August 2012

Biogas irrigation pump. Photo: d.j. fulford.

Biomass, in the form of firewood, charcoal, agricultural residues, or dried animal dung is already the main energy resource for the majority of the poorer half of humanity, over 2 000 million people. They currently use 15% or more of total world energy, entirely in the form of biomass. Certain poorer countries depend on biomass fuels at present for over 90% of their energy needs (i.e. mainly for cooking fuel). It has been estimated that 53% of energy use in Africa, 17% in Asia and 8% in Latin America is currently met from biomass resources. Therefore biomass is already a huge and vital economic resource, although it is usually informally exploited mainly for cooking purposes and still remains rarely used for the production of shaft power via heat engines, and even less so for irrigation pumping. But using biogas for pumps in irrigation is gaining in popularity in India and elsewhere, as the savings in petroleum fuel prices are great.

Because biogas digesters have the capability of storing at least a 12 hour supply of gas, an engine can be used that draws gas at quite a high rate. In fact the size of engine is not critical since it is only the number of hours it will run that are governed by the digester gas capacity.

An interesting option for irrigation by biogas power is to combine the digester sludge and the irrigation water in order to perform three functions simultaneously; i.e. irrigation, the application of fertilizer and waste disposal.

Suitable conditions

The main problem with biomass as a fuel is its uneven distribution, being most available in forested regions where it is little needed. Considered as a global resource there is no shortage of biomass, since:

• The world's annual rate of use of energy is only about 10% of the annual natural rate of photosynthetic energy storage (i.e. solar energy stored in plant matter); stored biomass on the earth's surface at present is approximately equivalent to the entire proven fossil fuel reserves (oil, coal and natural gas).

This issue of food versus fuel is an important one, but where the fuel crop is used for irrigation pumping to produce food crops, especially in a small-scale "on-farm" process, the same objections need not apply.

The country which has made by far the most use of biogas production in agriculture is China, where, particularly in Sichuan province, there are several million working biogas units. This development took place almost entirely within the last 10-15 years. Various studies (eg. [86]) have indicated that the value of the fertilizer output usually surpasses the value of the energy produced by the process in China. The waste disposal and sanitation aspects of the process are also important justifications for its use.

Reference manuals, videos, and links

Bio Gas Slurry / Cattle Dung Feed Pump. Used in cattle farms to pump out the cow dung/urine slurry to the biogas plant and the biogas slurry from the pit to the farm land. In use by the National Rural development Organisation and NGOs. Photo: Panchal Pumps and Systems.

Biogas balloon storage. Photo: Shenzhen Puxin Technology Co., Ltd.

• Article: Biomass Energy in Jordan.
• Instructions: National Bank for Agriculture and Rural Development, Bio-Gas.

• Video: Biogas plant construction in Kampala, Uganda.
• Video: Anaerobic methane digester how to, including biogas scrubbing.
• Video: Biogas: how it works.

• Commericial biogas generators.

South Asia

• Video: Purushottam Patel's biogas-driven irrigation pump - A video case study.
• Video: Biogas Driven Irrigation Pump. The diesel pump has been converted to a Biogas driven pump by the farmer, Purushottambhai Patel. Purushottambhai is from Shekhadi village in Petlad Taluka, Anand District (Gujarat). English subtitles.
• Video: Developing Biogas Plant.wmv in Polasong and Belguri village Kamrup district, Assam, INDIA, geographical coordinates N26 06.441 E92 04.290. The soil type is sandy loam to clay.
• Video: KITCHEN WASTE TO BIOGAS - BENEFICIARY STATEMENT. Biotech-India.org
• Video: Biogas project of Bangladesh. The success & problems of Bio gas project in Bangladesh. Not in English.
• Video: Bio Gas in Nepal. The biogas initiative in Nepal. In English and with English subtitles in some sections.

• Video: Biogas-powered Electrictal Generator in Myanmar. Brief video shot at the Myanmar Baptist Convention agricultural training center near Yangon in early March. Biogas brewed from wastes produced by a few hogs located just above this location is piped to an electric generator. Each day, there's enough biogas produced to power the 3 kw generator for 45 minutes in the morning and another 45 minutes in the evening. The generator, in turn, powers lights as well as an electric pump that extracts water from the center's well for storage in an elevated tank. The stored water flows by gravity to spigots throughout the farm. Saw Hei Moo, who directs the project, estimates that the biogas system costs about $350 with the generator running around $300. Toss in perhaps another $100 for pipe, cylinders and other types of essential apparatus.

• Video: Efficient Biogas digesters built by Wasandi BioSolar Company. Wasandi Biosolar (Pvt) Ltd makes Biogas digesters, and has worked for the last few years on making effiecient Biogas digesters. This type of digester is much cheaper to build, lasts longer, easier to repair, gives more gas, and can be built in 2 to 3 days at any place. We gaurantee our digesters for ten years, but our digesters will be good and working for more then 30 to 40 years. Biogas is the cleanest fuel available. If you are intrested in getting Biogas for your home or village, we can make a digester of any size. For details visit our web site: www.wasandi.com

Acknowledgements

• DIY Methane Generator.
• BIOMASS AND COAL (THE NON-PETROLEUM FUELS) FAO.