A collection and treatment system for organic waste and wastewater in a sensitive rural area.
In the municipality of Sund, located in a sensitive rural area in Aland, a demonstration project is now carried out with the overall objective to move the most concentrated fractions of wastewater from the coastal area to a treatment plant situated close to arable land. Blackwater and greywater septic sludge from about twenty households and two tourist camps are treated together with energy rich organic material from a nearby potato-chip factory. The collection concept is based on the use of extremely efficient water-saving toilets, with separate systems for the blackwater and greywater in the households. The collected materials are co-treated in a batchwise aerobic thermophilic treatment process (wet composting process), where the materials reach at least 55 degrees C during a minimum of 10 hours. The dry matter content of the collected material was about 2%. After stabilisation and sanitation (by the temperature rise caused by microbial activity during the treatment process), the compost slurry is utilized as a liquid organic fertilizer on arable land.
Malmén
L
L
Swedish Institute of Agricultural and Environmental Engineering, P.O. Box 7033, SE-750 07 Uppsala, Sweden. linda.malmen@jti.slu.se
Palm
O
O
Norin
E
E
D001420:Bacteria, Aerobic; D019149:Bioreactors; D003247:Conservation of Natural Resources; D005308:Fertilizers; D012424:Rural Population; D012499:Sanitation; D012722:Sewage / Q000737:chemistry; D013548:Sweden; D014038:Toilet Facilities; D014865:Waste Disposal, Fluid / Q000379:methods*
D005308:Fertilizers; D012722:Sewage