Avloppsslam - användning : Utvärdering av avsättningsmetoder samt en jämförelse mellan Sverige, Kina, Nederländerna och Storbritannien

Sammanfattning: The purpose of this project has been to evaluate the methods currently used in the sewage treatment plant's sludge management. Method used is literature study. The project has described the different deposition methods used today. Excluded are the methods used to clean the water and stabilize the sewage sludge. The project has examined how waste sludge management is in Sweden, China, the Netherlands and the UK. The intention has been to explain how the use of the respective deposition method looks and why the participating countries have chosen different deposition methods. Keywords used are Sewage sludge, ReVAQ, Heavy metals, Comparison of countries, Settlement options. Sewage sludge is one of the major unutilized assets we have, it brings not only economic benefits but also profits from environmental perspective. Sewage sludge contains many useful substances like nitrogen and phosphorus. These substances promote growth of the plants. There are also risks associated with the supply of sewage sludge to agricultural land such as heavy metals supply. There are many different methods of handling sewage sludge. The methods are divided into thermal and non-thermal. The most used deposition method is supply to farmland, combustion, landfill and land cover. Methods used to a lesser degree include wet oxidation and pyrolysis. Sludge management is governed by both EU directives (for EU member states) and the country's own legislation. The conclusions that can be drawn from this project are that there are many different methods of sludge management. New technology is also constantly evolving, which can create new opportunities. Countries in the study have chosen different marketing methods depending on current legislation in the area as well as the country's infrastructure and economic climate.