Archive for Energy from biowaste

Feb
06

Bio-energy Village Jühnde – Germany

Posted by: Adrian Slatcher | Comments Comments Off

The central idea of this model is a complete shift of energy sources for an entire village – away from conventional sources to the renewable and CO2 neutral biomass.
One such community is the bio-energy village in Jühnde, located in the southern part of Lower Saxony, Germany. It is the first of its kind in Germany, and aims to completely replace its fossil energy use for heating and electricity through bio-energy. The know-how attained in Jühnde is to be transferred to other suited neighbouring villages in an upcoming process to be started in autumn 2006. The energy system in the Jühnde model is operated by a local cooperative company. Beforehand, all inhabitants were invited to participate in the planning process. Working groups dealt with concrete visions about the energy future of their community. The common decision-making and problem-solving in the process of reorientation and conversion to renewable energy sources generated a new sense of orientation and connectedness within the community. So this participatory business case guarantees a high compatibility with local needs and networks of actors, while local competence can be established. One of the formulated aims of the Jühnde model is to support the local cultural heritage, and to strengthen the community life and identity.
Furthermore, a new market for farmers focusing on biomass as a renewable energy source is generated in addition to the traditional demand for crops. Selling bio-energy crops and wood as biomass creates a new income base for local farmers, and leads to higher employment levels in this sector. Economic prosperity can thus be secured in the long-term, given the steady rise in fossil-fuel costs. Also, the overall effect on the region’s and country’s balance of trade is positive, as payments for oil and natural gas imports are reduced.
The methodology and human resources of the ESTEEM tool has been used starting in January 2007.

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Feb
05

Biomass District Heating in Molins de Rei

Posted by: Adrian Slatcher | Comments Comments Off

Since February 2000, La Granja residential area in Molins de Rei has a hot water power plant run on biomass with 2,250 kW of thermal power. This is currently supplying heating and sanitary hot water to 250 dwellings in this area. It is envisaged that, by the year 2003, the number of dwellings connected to the grid may be 695. This increase will involve some useful-heat production in the range of 6,800 MWh/year, with a biomass consumption of 2,200 yearly tonnes. Such energy production will imply primary energy savings of some 730 toe/year, and will prevent over 1,700 yearly tonnes of CO2 from being dispersed into the atmosphere.

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At the time of project conception, WNI operated three steam boilers consuming approximately 11 million litres of heavy fuel oil per annum and as a consequence generating emissions of sulphur dioxide and particulates.
WNI also generated approximately 115 million gallons of dairy waste water per annum. This waste water underwent full biological treatment prior to local discharge. The micro-organisms essential to the treatment process require the untreated waste water to register within the pH band 6.0-8.5. A fundamental element of the waste-water treatment process within WNI was thus pH-correction of an alkaline waste by the addition of hydrochloric acid. The project was funded in part by the European project and is encrypted LIFE: LIFE96 ENV/IRL/91.

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The Aboyne Academy is located 30 miles west of Aberdeen. The Aboyne Academy consists of an academy, a primary school, an indoor swimming pool, library, theatre and community centre. The site plays an important role in serving the public in regards of education and community needs. The current academy remit stands at 650 students with an additional 280 pupils from the primary school. The heating requirement for the year 2005/2006 was 2,900,000kWh at a cost of £90,000.

The Aboyne Academy is under constant use (7 days a week, 350 days a year). The previous heating system consisted of 2 oil-fired boilers which provided heat and hot water. Each boiler at its most efficient time worked at 1460kW. The boilers were installed in 1974 and were at the end of their useful life by 2005.

In 2004 a feasibility study was carried out which resulted in after careful consideration, biomass was regarded as being a cost effective answer for the new installation.

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The Cañada Hermosa Urban Solid Waste Treatment Centre, which is managed by Cespa and is owned by the City of Murcia, prevented the emission of 60,000 tons of carbon dioxide (CO2) into the atmosphere last year. According to the American EPA (Environmental Protection Agency), this amount equals the emissions 11,000 cars produce each year or those that are generated to supply electricity to 8,000 homes over a period of a year.
The City of Murcia sludge plant, located in Cañada Hermosa and managed by Cepsa, receives 9,000 tons of mire a month from water treatment plants in the Region. This means that 108,000 tons of sludge enter the plant every year.

The mire that arrives at the plant, which is located in the Murcian district of Cañada Hermosa, is mixed with green waste (from gardens) and with the organic part of the urban waste and after a process, it is converted to compost which is used in farming and the fight against desertification. 534 hectares could be fertilized every month with the compost that is produced in the plant.

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Aguas de Murcia (Emuasa) designed and built a plant in which biogas is cleaned and later transformed into an ecological automotive fuel which Murcia East Sewage Plant decided to call Biogás de Depuradora (Bioedar), for use by company vehicles.

Biogas, which is a mix of gases from the anaerobic digestion of organic materials, can be used as a renewable energy source and therefore, the Aguas de Murcia plant has a process in which the biogas is taken through several stages to eliminate possible harmful substances.

The plant separates the main biogas components in the final stage to produce methane and carbon dioxide in two separate entities. To monitor the different compounds, the engineering personnel developed specific analytic methods to qualify and quantify the composition of the biogas.

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Partnership Energy Planning as a tool for realising European Sustainable Energy Communities


Contract No: EIE-07-179-S12.466281