THE PRODUCTION OF METHANE GAS BY MEANS OF ANAEROBIC DIGESTION OF FARM ANIMAL WASTE

Ziel

The aim of the project is to design methane digesters particularly appropriate, first from a technological standpoint for the biomethanation of liquid dilute manure, and secondly, from the socio-economic standpoint for operation within a farm.
Garderen : In the original digester, settling took place due to inefficient mixing. As a consequence the capacity of the heat exchange pipes at the bottom of the digester was insufficient. Since August 1980 the digester has been equipped with a central vertical heat/gas mixing device. It was found that production could be increased by including fish waste in pig manure however this resulted in the formation of a scum layer and pumping problems. Nett biogas production 34 m3/day.
Lelystad : From the start, in 1980, production was very low. Beef cattle manure containing antibiotics was used as the substrate. The antibiotics (monensin) may have inhibited the fermentation process. Early problems were encountered with H2S requiring a purification step. Ammonia toxicity was also a problem. The plant never worked satisfactorily in spite of many technical modifications and pretreatment of the slurry.
Klarenbeek : Due to high ammonia concentration in the digester, it has to be operated at a23 day detention time. After two years of operation, the digester capacity was increased from 75 to 140 m3. Average loading rate was 2.6 - 4 m3/day producing between 42 and 67 m3/day gas. Yield suffered if manure was stored too long. Nett biogas production 62 m3/day.
Duiven : This digester biometherises dairy cattle manure. In the first years of operation there were many technical problems. The plant was rebuilt in 1985. A unit for pre-heating fresh slurry was installed. The steel gasholder was replaced by a balloon type. A gas scrubber was added. Nett biogas production 40 m3/day. The gas produced was used in a Fiat Totam cogenerator from 1981 to 1983 without problems.
Design, construction, start-up, and operation of the following biogas plants were proposed: Methane digesters in Rhenen and Cuyck, Neth. Both were abandoned in favour of a methane digester in Klarenbeek to handle the manure of 1000 pigs, and one in Lelystad to handle the manure of 180 dairy cattle heads.
The methane digester in Klarenbeek consisted of a standing cylindrical tank of 140 m3 total volume, of which 80 m3 is digestion working volume and 60 m3, gas-holding volume. A supplementary balloon-type gasholder of 100 m3 was added. The manure amounts to 1500 m3 per year. It is introduced at a rate of 4 m3 per day in the methane digester at 30 deg.C with a mean detention time of 20 d. Mixing by liquid recirculation and loading occurs with a 7 kW pump. The produced biogas is burned in a 30 Mcal boiler and the energy used for heating the farm. The digested effluent is stored in a silo.
The methane digester in Lelystad is of the plugflow type, made in steel. It treats 4 m3 manure per day originating from 70 dairy cows, at 30-35 deg.C. The produced gas is stored in a 100 m3 balloon. A methane digester in Zeeland was replaced by an alternative.
A biogas project in Schijndel started in 1980. The digester was built of enamelled steel with a mixed liquor volume of 200 m3. Biogas is stored in a steel tank at maximum pressure of 15 bar. Original design criteria :
load = 3,5 kg TS/m3/day
detention time = 16,7 days
gas production = 69.660 m3/year
manure production = 3860 m3/year
The digester is heated with solar energy.
Practical experience is also being gained from two existing biogas plants, one in Garderen, treating the manure from 2500 pigs in a methane digester of 270 m3 working volume, and 150 m3 gas holding volume, and one in Duiven, planned for 100 cattle heads.

Programm/Programme

ENG-ENALT 1C - Programme (EEC) of financial support for projects to exploit alternative energy sources, 1979-1984

Thema/Themen

1.7 - PRODUCTION AND USE OF BIOGAS

Aufforderung zur Vorschlagseinreichung

Data not available

Finanzierungsplan

DEM - Demonstration contracts

Koordinator

IMAG-SCHIJNDEL

EU-Beitrag

Keine Daten

Adresse

MANSHOLTLAAN 10-12/POSTBUS 43
6700 AA WAGENINGEN
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