Abstract
The use of biological anaerobic treatment for industrial organic waste to close nutrient circulation in society. The organic waste has an clearly potential for reducing use of the earth's resources and will be of essential importance for human living and foodproduktion in an near future. The paper will give an example of one way to reuse of nutrients back to the farmland, and how earlier Agenda 21 work leads to a better society.
Highlights
The main sewage plant in Kalmar was designed for 130 000 Pe
All equipment should be chosen to correspond with waste water plant, both electrically and mechanically, in order to keep the need of spareparts as low as possible
The positive and Jong time experience in anaerobic sludge treatment has successfully been transferred into anaerobic treatment of waste waters with high content of organic matter
Summary
The main sewage plant in Kalmar was designed for 130 000 Pe (personal equivalents). The designing was carried out during the happy 70.ies, when everybody calculated with continuos expansion of the society and population. The average intake of sewage is very even spread over the year, due to the fact that most of the industry in Kalmar is food industry All these facts together made it possible for us to look at the possibilities to increase the intake of organic waste to the digesters. The certificate tells the farmers metallcontent, metals and nutrients This has made it possible for us to spread about 80% of the sludge on farmland, the rest is put in the solid waste deposit. The group started with exami nation of the amount of organic matters that was possible to treat in the surroundings of Kalmar. All analyses was put together sent to Irini Angelidaki at Copenhagen University in order to perform an computersimulation of the digesters This simulation was carried out in order to find the limitations we had in volumes. We understood that we had to put a lot of effort in constructing these parts of the plant
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